Calculate ForgeBatch gasLimit with parametrized formula

Add the following config parameters at
`Coordinator.EthClient.ForgeBatchGasCost`:
- `Fixed`
- `L1UserTx`
- `L1CoordTx`
- `L2Tx`
Which are the costs associated to a ForgeBatch transaction, split
into different parts to be used in the formula to compute the gasLimit.

README.md

@@ -15,7 +15,7 @@ start PostgreSQL with docker easily this way (where `yourpasswordhere` should
 be your password):
 
 ```
-POSTGRES_PASS=yourpasswordhere sudo docker run --rm --name hermez-db-test -p 5432:5432 -e POSTGRES_DB=hermez -e POSTGRES_USER=hermez -e POSTGRES_PASSWORD="$POSTGRES_PASS" -d postgres
+POSTGRES_PASS=yourpasswordhere; sudo docker run --rm --name hermez-db-test -p 5432:5432 -e POSTGRES_DB=hermez -e POSTGRES_USER=hermez -e POSTGRES_PASSWORD="$POSTGRES_PASS" -d postgres
 ```
 
 Afterwards, run the tests with the password as env var:

api/account.go

@@ -4,10 +4,7 @@ import (
 	"net/http"
 
 	"github.com/gin-gonic/gin"
-	"github.com/hermeznetwork/hermez-node/apitypes"
 	"github.com/hermeznetwork/hermez-node/db/historydb"
-	"github.com/hermeznetwork/hermez-node/db/statedb"
-	"github.com/hermeznetwork/tracerr"
 )
 
 func (a *API) getAccount(c *gin.Context) {
@@ -23,16 +20,6 @@ func (a *API) getAccount(c *gin.Context) {
 		return
 	}
 
-	// Get balance from stateDB
-	account, err := a.s.LastGetAccount(*idx)
-	if err != nil {
-		retSQLErr(err, c)
-		return
-	}
-
-	apiAccount.Balance = apitypes.NewBigIntStr(account.Balance)
-	apiAccount.Nonce = account.Nonce
-
 	c.JSON(http.StatusOK, apiAccount)
 }
 
@@ -57,26 +44,6 @@ func (a *API) getAccounts(c *gin.Context) {
 		return
 	}
 
-	// Get balances from stateDB
-	if err := a.s.LastRead(func(sdb *statedb.Last) error {
-		for x, apiAccount := range apiAccounts {
-			idx, err := stringToIdx(string(apiAccount.Idx), "Account Idx")
-			if err != nil {
-				return tracerr.Wrap(err)
-			}
-			account, err := sdb.GetAccount(*idx)
-			if err != nil {
-				return tracerr.Wrap(err)
-			}
-			apiAccounts[x].Balance = apitypes.NewBigIntStr(account.Balance)
-			apiAccounts[x].Nonce = account.Nonce
-		}
-		return nil
-	}); err != nil {
-		retSQLErr(err, c)
-		return
-	}
-
 	// Build succesfull response
 	type accountResponse struct {
 		Accounts     []historydb.AccountAPI `json:"accounts"`

api/api.go

@@ -9,7 +9,6 @@ import (
 	"github.com/hermeznetwork/hermez-node/common"
 	"github.com/hermeznetwork/hermez-node/db/historydb"
 	"github.com/hermeznetwork/hermez-node/db/l2db"
-	"github.com/hermeznetwork/hermez-node/db/statedb"
 	"github.com/hermeznetwork/tracerr"
 )
 
@@ -34,7 +33,6 @@ type Status struct {
 type API struct {
 	h             *historydb.HistoryDB
 	cg            *configAPI
-	s             *statedb.StateDB
 	l2            *l2db.L2DB
 	status        Status
 	chainID       uint16
@@ -46,7 +44,6 @@ func NewAPI(
 	coordinatorEndpoints, explorerEndpoints bool,
 	server *gin.Engine,
 	hdb *historydb.HistoryDB,
-	sdb *statedb.StateDB,
 	l2db *l2db.L2DB,
 	config *Config,
 ) (*API, error) {
@@ -66,7 +63,6 @@ func NewAPI(
 			AuctionConstants:  config.AuctionConstants,
 			WDelayerConstants: config.WDelayerConstants,
 		},
-		s:             sdb,
 		l2:            l2db,
 		status:        Status{},
 		chainID:       config.ChainID,

api/api_test.go

@@ -8,6 +8,7 @@ import (
 	"io"
 	"io/ioutil"
 	"math/big"
+	"net"
 	"net/http"
 	"os"
 	"strconv"
@@ -22,7 +23,6 @@ import (
 	"github.com/hermeznetwork/hermez-node/db"
 	"github.com/hermeznetwork/hermez-node/db/historydb"
 	"github.com/hermeznetwork/hermez-node/db/l2db"
-	"github.com/hermeznetwork/hermez-node/db/statedb"
 	"github.com/hermeznetwork/hermez-node/log"
 	"github.com/hermeznetwork/hermez-node/test"
 	"github.com/hermeznetwork/hermez-node/test/til"
@@ -39,8 +39,8 @@ type Pendinger interface {
 	New() Pendinger
 }
 
-const apiPort = ":4010"
-const apiURL = "http://localhost" + apiPort + "/"
+const apiAddr = ":4010"
+const apiURL = "http://localhost" + apiAddr + "/"
 
 var SetBlockchain = `
 	Type: Blockchain
@@ -202,7 +202,7 @@ func TestMain(m *testing.M) {
 		panic(err)
 	}
 	apiConnCon := db.NewAPICnnectionController(1, time.Second)
-	hdb := historydb.NewHistoryDB(database, apiConnCon)
+	hdb := historydb.NewHistoryDB(database, database, apiConnCon)
 	if err != nil {
 		panic(err)
 	}
@@ -216,12 +216,8 @@ func TestMain(m *testing.M) {
 			panic(err)
 		}
 	}()
-	sdb, err := statedb.NewStateDB(statedb.Config{Path: dir, Keep: 128, Type: statedb.TypeTxSelector, NLevels: 0})
-	if err != nil {
-		panic(err)
-	}
 	// L2DB
-	l2DB := l2db.NewL2DB(database, 10, 1000, 24*time.Hour, apiConnCon)
+	l2DB := l2db.NewL2DB(database, database, 10, 1000, 0.0, 24*time.Hour, apiConnCon)
 	test.WipeDB(l2DB.DB()) // this will clean HistoryDB and L2DB
 	// Config (smart contract constants)
 	chainID := uint16(0)
@@ -239,7 +235,6 @@ func TestMain(m *testing.M) {
 		true,
 		apiGin,
 		hdb,
-		sdb,
 		l2DB,
 		&_config,
 	)
@@ -247,9 +242,14 @@ func TestMain(m *testing.M) {
 		panic(err)
 	}
 	// Start server
-	server := &http.Server{Addr: apiPort, Handler: apiGin}
+	listener, err := net.Listen("tcp", apiAddr) //nolint:gosec
+	if err != nil {
+		panic(err)
+	}
+	server := &http.Server{Handler: apiGin}
 	go func() {
-		if err := server.ListenAndServe(); err != nil && tracerr.Unwrap(err) != http.ErrServerClosed {
+		if err := server.Serve(listener); err != nil &&
+			tracerr.Unwrap(err) != http.ErrServerClosed {
 			panic(err)
 		}
 	}()
@@ -350,19 +350,6 @@ func TestMain(m *testing.M) {
 		}
 	}
 
-	// lastBlockNum2 := blocksData[len(blocksData)-1].Block.EthBlockNum
-
-	// Add accounts to StateDB
-	for i := 0; i < len(commonAccounts); i++ {
-		if _, err := api.s.CreateAccount(commonAccounts[i].Idx, &commonAccounts[i]); err != nil {
-			panic(err)
-		}
-	}
-	// Make a checkpoint to make the accounts available in Last
-	if err := api.s.MakeCheckpoint(); err != nil {
-		panic(err)
-	}
-
 	// Generate Coordinators and add them to HistoryDB
 	const nCoords = 10
 	commonCoords := test.GenCoordinators(nCoords, commonBlocks)
@@ -529,13 +516,41 @@ func TestMain(m *testing.M) {
 	testTxs := genTestTxs(commonL1Txs, commonL2Txs, commonAccounts, testTokens, commonBlocks)
 	testBatches, testFullBatches := genTestBatches(commonBlocks, commonBatches, testTxs)
 	poolTxsToSend, poolTxsToReceive := genTestPoolTxs(commonPoolTxs, testTokens, commonAccounts)
+	// Add balance and nonce to historyDB
+	accounts := genTestAccounts(commonAccounts, testTokens)
+	accUpdates := []common.AccountUpdate{}
+	for i := 0; i < len(accounts); i++ {
+		balance := new(big.Int)
+		balance.SetString(string(*accounts[i].Balance), 10)
+		idx, err := stringToIdx(string(accounts[i].Idx), "foo")
+		if err != nil {
+			panic(err)
+		}
+		accUpdates = append(accUpdates, common.AccountUpdate{
+			EthBlockNum: 0,
+			BatchNum:    1,
+			Idx:         *idx,
+			Nonce:       0,
+			Balance:     balance,
+		})
+		accUpdates = append(accUpdates, common.AccountUpdate{
+			EthBlockNum: 0,
+			BatchNum:    1,
+			Idx:         *idx,
+			Nonce:       accounts[i].Nonce,
+			Balance:     balance,
+		})
+	}
+	if err := api.h.AddAccountUpdates(accUpdates); err != nil {
+		panic(err)
+	}
 	tc = testCommon{
 		blocks:           commonBlocks,
 		tokens:           testTokens,
 		batches:          testBatches,
 		fullBatches:      testFullBatches,
 		coordinators:     testCoords,
-		accounts:         genTestAccounts(commonAccounts, testTokens),
+		accounts:         accounts,
 		txs:              testTxs,
 		exits:            testExits,
 		poolTxsToSend:    poolTxsToSend,
@@ -582,10 +597,10 @@ func TestTimeout(t *testing.T) {
 	databaseTO, err := db.InitSQLDB(5432, "localhost", "hermez", pass, "hermez")
 	require.NoError(t, err)
 	apiConnConTO := db.NewAPICnnectionController(1, 100*time.Millisecond)
-	hdbTO := historydb.NewHistoryDB(databaseTO, apiConnConTO)
+	hdbTO := historydb.NewHistoryDB(databaseTO, databaseTO, apiConnConTO)
 	require.NoError(t, err)
 	// L2DB
-	l2DBTO := l2db.NewL2DB(databaseTO, 10, 1000, 24*time.Hour, apiConnConTO)
+	l2DBTO := l2db.NewL2DB(databaseTO, databaseTO, 10, 1000, 1.0, 24*time.Hour, apiConnConTO)
 
 	// API
 	apiGinTO := gin.Default()
@@ -600,9 +615,12 @@ func TestTimeout(t *testing.T) {
 		<-finishWait
 	})
 	// Start server
-	serverTO := &http.Server{Addr: ":4444", Handler: apiGinTO}
+	serverTO := &http.Server{Handler: apiGinTO}
+	listener, err := net.Listen("tcp", ":4444") //nolint:gosec
+	require.NoError(t, err)
 	go func() {
-		if err := serverTO.ListenAndServe(); err != nil && tracerr.Unwrap(err) != http.ErrServerClosed {
+		if err := serverTO.Serve(listener); err != nil &&
+			tracerr.Unwrap(err) != http.ErrServerClosed {
 			require.NoError(t, err)
 		}
 	}()
@@ -612,7 +630,6 @@ func TestTimeout(t *testing.T) {
 		true,
 		apiGinTO,
 		hdbTO,
-		nil,
 		l2DBTO,
 		&_config,
 	)

api/handlers.go

@@ -10,6 +10,7 @@ import (
 	"github.com/hermeznetwork/hermez-node/log"
 	"github.com/hermeznetwork/tracerr"
 	"github.com/lib/pq"
+	"github.com/russross/meddler"
 )
 
 const (
@@ -46,24 +47,33 @@ var (
 func retSQLErr(err error, c *gin.Context) {
 	log.Warnw("HTTP API SQL request error", "err", err)
 	errMsg := tracerr.Unwrap(err).Error()
+	retDupKey := func(errCode pq.ErrorCode) {
+		// https://www.postgresql.org/docs/current/errcodes-appendix.html
+		if errCode == "23505" {
+			c.JSON(http.StatusInternalServerError, errorMsg{
+				Message: errDuplicatedKey,
+			})
+		} else {
+			c.JSON(http.StatusInternalServerError, errorMsg{
+				Message: errMsg,
+			})
+		}
+	}
 	if errMsg == errCtxTimeout {
 		c.JSON(http.StatusServiceUnavailable, errorMsg{
 			Message: errSQLTimeout,
 		})
 	} else if sqlErr, ok := tracerr.Unwrap(err).(*pq.Error); ok {
-		// https://www.postgresql.org/docs/current/errcodes-appendix.html
-		if sqlErr.Code == "23505" {
-			c.JSON(http.StatusInternalServerError, errorMsg{
-				Message: errDuplicatedKey,
-			})
-		}
+		retDupKey(sqlErr.Code)
+	} else if sqlErr, ok := meddler.DriverErr(tracerr.Unwrap(err)); ok {
+		retDupKey(sqlErr.(*pq.Error).Code)
 	} else if tracerr.Unwrap(err) == sql.ErrNoRows {
 		c.JSON(http.StatusNotFound, errorMsg{
-			Message: err.Error(),
+			Message: errMsg,
 		})
 	} else {
 		c.JSON(http.StatusInternalServerError, errorMsg{
-			Message: err.Error(),
+			Message: errMsg,
 		})
 	}
 }

api/state.go

@@ -3,6 +3,7 @@ package api
 import (
 	"database/sql"
 	"fmt"
+	"math"
 	"math/big"
 	"net/http"
 	"time"
@@ -297,10 +298,17 @@ func (a *API) UpdateRecommendedFee() error {
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
+	var minFeeUSD float64
+	if a.l2 != nil {
+		minFeeUSD = a.l2.MinFeeUSD()
+	}
 	a.status.Lock()
-	a.status.RecommendedFee.ExistingAccount = feeExistingAccount
-	a.status.RecommendedFee.CreatesAccount = createAccountExtraFeePercentage * feeExistingAccount
-	a.status.RecommendedFee.CreatesAccountAndRegister = createAccountInternalExtraFeePercentage * feeExistingAccount
+	a.status.RecommendedFee.ExistingAccount =
+		math.Max(feeExistingAccount, minFeeUSD)
+	a.status.RecommendedFee.CreatesAccount =
+		math.Max(createAccountExtraFeePercentage*feeExistingAccount, minFeeUSD)
+	a.status.RecommendedFee.CreatesAccountAndRegister =
+		math.Max(createAccountInternalExtraFeePercentage*feeExistingAccount, minFeeUSD)
 	a.status.Unlock()
 	return nil
 }

api/state_test.go

@@ -131,7 +131,7 @@ func TestUpdateNetworkInfo(t *testing.T) {
 func TestUpdateMetrics(t *testing.T) {
 	// Update Metrics needs api.status.Network.LastBatch.BatchNum to be updated
 	lastBlock := tc.blocks[3]
-	lastBatchNum := common.BatchNum(3)
+	lastBatchNum := common.BatchNum(12)
 	currentSlotNum := int64(1)
 	err := api.UpdateNetworkInfo(lastBlock, lastBlock, lastBatchNum, currentSlotNum)
 	assert.NoError(t, err)
@@ -149,7 +149,11 @@ func TestUpdateMetrics(t *testing.T) {
 func TestUpdateRecommendedFee(t *testing.T) {
 	err := api.UpdateRecommendedFee()
 	assert.NoError(t, err)
-	assert.Greater(t, api.status.RecommendedFee.ExistingAccount, float64(0))
+	var minFeeUSD float64
+	if api.l2 != nil {
+		minFeeUSD = api.l2.MinFeeUSD()
+	}
+	assert.Greater(t, api.status.RecommendedFee.ExistingAccount, minFeeUSD)
 	assert.Equal(t, api.status.RecommendedFee.CreatesAccount,
 		api.status.RecommendedFee.ExistingAccount*createAccountExtraFeePercentage)
 	assert.Equal(t, api.status.RecommendedFee.CreatesAccountAndRegister,
@@ -158,7 +162,7 @@ func TestUpdateRecommendedFee(t *testing.T) {
 
 func TestGetState(t *testing.T) {
 	lastBlock := tc.blocks[3]
-	lastBatchNum := common.BatchNum(3)
+	lastBatchNum := common.BatchNum(12)
 	currentSlotNum := int64(1)
 	api.SetRollupVariables(tc.rollupVars)
 	api.SetWDelayerVariables(tc.wdelayerVars)

api/txspool.go

@@ -2,6 +2,7 @@ package api
 
 import (
 	"errors"
+	"fmt"
 	"math/big"
 	"net/http"
 
@@ -27,6 +28,7 @@ func (a *API) postPoolTx(c *gin.Context) {
 		retBadReq(err, c)
 		return
 	}
+	writeTx.ClientIP = c.ClientIP()
 	// Insert to DB
 	if err := a.l2.AddTxAPI(writeTx); err != nil {
 		retSQLErr(err, c)
@@ -169,16 +171,21 @@ func (a *API) verifyPoolL2TxWrite(txw *l2db.PoolL2TxWrite) error {
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
-	// Get public key
-	account, err := a.s.LastGetAccount(poolTx.FromIdx)
-	if err != nil {
-		return tracerr.Wrap(err)
-	}
 	// Validate feeAmount
 	_, err = common.CalcFeeAmount(poolTx.Amount, poolTx.Fee)
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
+	// Get public key
+	account, err := a.h.GetCommonAccountAPI(poolTx.FromIdx)
+	if err != nil {
+		return tracerr.Wrap(err)
+	}
+	// Validate TokenID
+	if poolTx.TokenID != account.TokenID {
+		return tracerr.Wrap(fmt.Errorf("tx.TokenID (%v) != account.TokenID (%v)",
+			poolTx.TokenID, account.TokenID))
+	}
 	// Check signature
 	if !poolTx.VerifySignature(a.chainID, account.BJJ) {
 		return tracerr.Wrap(errors.New("wrong signature"))

api/txspool_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/hermeznetwork/hermez-node/db/historydb"
 	"github.com/iden3/go-iden3-crypto/babyjub"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 // testPoolTxReceive is a struct to be used to assert the response
@@ -170,9 +171,9 @@ func TestPoolTxs(t *testing.T) {
 	fetchedTxID := common.TxID{}
 	for _, tx := range tc.poolTxsToSend {
 		jsonTxBytes, err := json.Marshal(tx)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		jsonTxReader := bytes.NewReader(jsonTxBytes)
-		assert.NoError(
+		require.NoError(
 			t, doGoodReq(
 				"POST",
 				endpoint,
@@ -187,42 +188,42 @@ func TestPoolTxs(t *testing.T) {
 	badTx.Amount = "99950000000000000"
 	badTx.Fee = 255
 	jsonTxBytes, err := json.Marshal(badTx)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	jsonTxReader := bytes.NewReader(jsonTxBytes)
 	err = doBadReq("POST", endpoint, jsonTxReader, 400)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// Wrong signature
 	badTx = tc.poolTxsToSend[0]
 	badTx.FromIdx = "hez:foo:1000"
 	jsonTxBytes, err = json.Marshal(badTx)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	jsonTxReader = bytes.NewReader(jsonTxBytes)
 	err = doBadReq("POST", endpoint, jsonTxReader, 400)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// Wrong to
 	badTx = tc.poolTxsToSend[0]
 	ethAddr := "hez:0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
 	badTx.ToEthAddr = &ethAddr
 	badTx.ToIdx = nil
 	jsonTxBytes, err = json.Marshal(badTx)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	jsonTxReader = bytes.NewReader(jsonTxBytes)
 	err = doBadReq("POST", endpoint, jsonTxReader, 400)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// Wrong rq
 	badTx = tc.poolTxsToSend[0]
 	rqFromIdx := "hez:foo:30"
 	badTx.RqFromIdx = &rqFromIdx
 	jsonTxBytes, err = json.Marshal(badTx)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	jsonTxReader = bytes.NewReader(jsonTxBytes)
 	err = doBadReq("POST", endpoint, jsonTxReader, 400)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// GET
 	endpoint += "/"
 	for _, tx := range tc.poolTxsToReceive {
 		fetchedTx := testPoolTxReceive{}
-		assert.NoError(
+		require.NoError(
 			t, doGoodReq(
 				"GET",
 				endpoint+tx.TxID.String(),
@@ -233,10 +234,10 @@ func TestPoolTxs(t *testing.T) {
 	}
 	// 400, due invalid TxID
 	err = doBadReq("GET", endpoint+"0xG2241b6f2b1dd772dba391f4a1a3407c7c21f598d86e2585a14e616fb4a255f823", nil, 400)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// 404, due inexistent TxID in DB
 	err = doBadReq("GET", endpoint+"0x02241b6f2b1dd772dba391f4a1a3407c7c21f598d86e2585a14e616fb4a255f823", nil, 404)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 }
 
 func assertPoolTx(t *testing.T, expected, actual testPoolTxReceive) {

batchbuilder/batchbuilder.go

@@ -64,7 +64,10 @@ func (bb *BatchBuilder) BuildBatch(coordIdxs []common.Idx, configBatch *ConfigBa
 	tp := txprocessor.NewTxProcessor(bbStateDB, configBatch.TxProcessorConfig)
 
 	ptOut, err := tp.ProcessTxs(coordIdxs, l1usertxs, l1coordinatortxs, pooll2txs)
-	return ptOut.ZKInputs, tracerr.Wrap(err)
+	if err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+	return ptOut.ZKInputs, nil
 }
 
 // LocalStateDB returns the underlying LocalStateDB

cli/node/.gitignore

@@ -1,2 +1,3 @@
 cfg.example.secret.toml
 cfg.toml
+node

cli/node/cfg.buidler.toml

@@ -20,11 +20,16 @@ Path = "/tmp/iden3-test/hermez/statedb"
 Keep = 256
 
 [PostgreSQL]
-Port     = 5432
-Host     = "localhost"
-User     = "hermez"
-Password = "yourpasswordhere"
-Name     = "hermez"
+PortWrite     = 5432
+HostWrite     = "localhost"
+UserWrite     = "hermez"
+PasswordWrite = "yourpasswordhere"
+NameWrite     = "hermez"
+# PortRead     = 5432
+# HostRead     = "localhost"
+# UserRead     = "hermez"
+# PasswordRead = "yourpasswordhere"
+# NameRead     = "hermez"
 
 [Web3]
 URL = "http://localhost:8545"
@@ -55,6 +60,7 @@ ForgeRetryInterval = "500ms"
 SyncRetryInterval = "1s"
 ForgeDelay = "10s"
 ForgeNoTxsDelay = "0s"
+PurgeByExtDelInterval = "1m"
 
 [Coordinator.FeeAccount]
 Address = "0x56232B1c5B10038125Bc7345664B4AFD745bcF8E"
@@ -65,6 +71,7 @@ BJJ = "0x1b176232f78ba0d388ecc5f4896eca2d3b3d4f272092469f559247297f5c0c13"
 [Coordinator.L2DB]
 SafetyPeriod = 10
 MaxTxs       = 512
+MinFeeUSD    = 0.0
 TTL          = "24h"
 PurgeBatchDelay = 10
 InvalidateBatchDelay = 20
@@ -97,6 +104,12 @@ GasPriceIncPerc = 10
 Path = "/tmp/iden3-test/hermez/ethkeystore"
 Password = "yourpasswordhere"
 
+[Coordinator.EthClient.ForgeBatchGasCost]
+Fixed = 500000
+L1UserTx = 8000
+L1CoordTx = 9000
+L2Tx = 1
+
 [Coordinator.API]
 Coordinator = true
 

cli/node/main.go

@@ -17,6 +17,7 @@ import (
 	"github.com/hermeznetwork/hermez-node/node"
 	"github.com/hermeznetwork/tracerr"
 	"github.com/iden3/go-iden3-crypto/babyjub"
+	"github.com/jmoiron/sqlx"
 	"github.com/urfave/cli/v2"
 )
 
@@ -90,11 +91,11 @@ func cmdWipeSQL(c *cli.Context) error {
 		}
 	}
 	db, err := dbUtils.ConnectSQLDB(
-		cfg.PostgreSQL.Port,
-		cfg.PostgreSQL.Host,
-		cfg.PostgreSQL.User,
-		cfg.PostgreSQL.Password,
-		cfg.PostgreSQL.Name,
+		cfg.PostgreSQL.PortWrite,
+		cfg.PostgreSQL.HostWrite,
+		cfg.PostgreSQL.UserWrite,
+		cfg.PostgreSQL.PasswordWrite,
+		cfg.PostgreSQL.NameWrite,
 	)
 	if err != nil {
 		return tracerr.Wrap(err)
@@ -151,17 +152,36 @@ func cmdDiscard(c *cli.Context) error {
 	blockNum := c.Int64(flagBlock)
 	log.Infof("Discarding all blocks up to block %v...", blockNum)
 
-	db, err := dbUtils.InitSQLDB(
-		cfg.PostgreSQL.Port,
-		cfg.PostgreSQL.Host,
-		cfg.PostgreSQL.User,
-		cfg.PostgreSQL.Password,
-		cfg.PostgreSQL.Name,
+	dbWrite, err := dbUtils.InitSQLDB(
+		cfg.PostgreSQL.PortWrite,
+		cfg.PostgreSQL.HostWrite,
+		cfg.PostgreSQL.UserWrite,
+		cfg.PostgreSQL.PasswordWrite,
+		cfg.PostgreSQL.NameWrite,
 	)
 	if err != nil {
 		return tracerr.Wrap(fmt.Errorf("dbUtils.InitSQLDB: %w", err))
 	}
-	historyDB := historydb.NewHistoryDB(db, nil)
+	var dbRead *sqlx.DB
+	if cfg.PostgreSQL.HostRead == "" {
+		dbRead = dbWrite
+	} else if cfg.PostgreSQL.HostRead == cfg.PostgreSQL.HostWrite {
+		return tracerr.Wrap(fmt.Errorf(
+			"PostgreSQL.HostRead and PostgreSQL.HostWrite must be different",
+		))
+	} else {
+		dbRead, err = dbUtils.InitSQLDB(
+			cfg.PostgreSQL.PortRead,
+			cfg.PostgreSQL.HostRead,
+			cfg.PostgreSQL.UserRead,
+			cfg.PostgreSQL.PasswordRead,
+			cfg.PostgreSQL.NameRead,
+		)
+		if err != nil {
+			return tracerr.Wrap(fmt.Errorf("dbUtils.InitSQLDB: %w", err))
+		}
+	}
+	historyDB := historydb.NewHistoryDB(dbRead, dbWrite, nil)
 	if err := historyDB.Reorg(blockNum); err != nil {
 		return tracerr.Wrap(fmt.Errorf("historyDB.Reorg: %w", err))
 	}
@@ -170,9 +190,10 @@ func cmdDiscard(c *cli.Context) error {
 		return tracerr.Wrap(fmt.Errorf("historyDB.GetLastBatchNum: %w", err))
 	}
 	l2DB := l2db.NewL2DB(
-		db,
+		dbRead, dbWrite,
 		cfg.Coordinator.L2DB.SafetyPeriod,
 		cfg.Coordinator.L2DB.MaxTxs,
+		cfg.Coordinator.L2DB.MinFeeUSD,
 		cfg.Coordinator.L2DB.TTL.Duration,
 		nil,
 	)

common/account.go

@@ -263,3 +263,13 @@ type IdxNonce struct {
 	Idx   Idx   `db:"idx"`
 	Nonce Nonce `db:"nonce"`
 }
+
+// AccountUpdate represents an account balance and/or nonce update after a
+// processed batch
+type AccountUpdate struct {
+	EthBlockNum int64    `meddler:"eth_block_num"`
+	BatchNum    BatchNum `meddler:"batch_num"`
+	Idx         Idx      `meddler:"idx"`
+	Nonce       Nonce    `meddler:"nonce"`
+	Balance     *big.Int `meddler:"balance,bigint"`
+}

common/batch.go

@@ -77,6 +77,7 @@ type BatchData struct {
 	L1CoordinatorTxs []L1Tx
 	L2Txs            []L2Tx
 	CreatedAccounts  []Account
+	UpdatedAccounts  []AccountUpdate
 	ExitTree         []ExitInfo
 	Batch            Batch
 }

common/utils.go

@@ -62,3 +62,17 @@ func RmEndingZeroes(siblings []*merkletree.Hash) []*merkletree.Hash {
 	}
 	return siblings[:pos]
 }
+
+// TokensToUSD is a helper function to calculate the USD value of a certain
+// amount of tokens considering the normalized token price (which is the price
+// commonly reported by exhanges)
+func TokensToUSD(amount *big.Int, decimals uint64, valueUSD float64) float64 {
+	amountF := new(big.Float).SetInt(amount)
+	// Divide by 10^decimals to normalize the amount
+	baseF := new(big.Float).SetInt(new(big.Int).Exp(
+		big.NewInt(10), big.NewInt(int64(decimals)), nil)) //nolint:gomnd
+	amountF.Mul(amountF, big.NewFloat(valueUSD))
+	amountF.Quo(amountF, baseF)
+	amountUSD, _ := amountF.Float64()
+	return amountUSD
+}

config/config.go

@@ -35,6 +35,15 @@ type ServerProof struct {
 	URL string `validate:"required"`
 }
 
+// ForgeBatchGasCost is the costs associated to a ForgeBatch transaction, split
+// into different parts to be used in a formula.
+type ForgeBatchGasCost struct {
+	Fixed     uint64 `validate:"required"`
+	L1UserTx  uint64 `validate:"required"`
+	L1CoordTx uint64 `validate:"required"`
+	L2Tx      uint64 `validate:"required"`
+}
+
 // Coordinator is the coordinator specific configuration.
 type Coordinator struct {
 	// ForgerAddress is the address under which this coordinator is forging
@@ -91,6 +100,10 @@ type Coordinator struct {
 	// SyncRetryInterval is the waiting interval between calls to the main
 	// handler of a synced block after an error
 	SyncRetryInterval Duration `validate:"required"`
+	// PurgeByExtDelInterval is the waiting interval between calls
+	// to the PurgeByExternalDelete function of the l2db which deletes
+	// pending txs externally marked by the column `external_delete`
+	PurgeByExtDelInterval Duration `validate:"required"`
 	// L2DB is the DB that holds the pool of L2Txs
 	L2DB struct {
 		// SafetyPeriod is the number of batches after which
@@ -101,6 +114,10 @@ type Coordinator struct {
 		// reached, inserts to the pool will be denied until some of
 		// the pending txs are forged.
 		MaxTxs uint32 `validate:"required"`
+		// MinFeeUSD is the minimum fee in USD that a tx must pay in
+		// order to be accepted into the pool.  Txs with lower than
+		// minimum fee will be rejected at the API level.
+		MinFeeUSD float64
 		// TTL is the Time To Live for L2Txs in the pool.  Once MaxTxs
 		// L2Txs is reached, L2Txs older than TTL will be deleted.
 		TTL Duration `validate:"required"`
@@ -172,6 +189,9 @@ type Coordinator struct {
 			// Password used to decrypt the keys in the keystore
 			Password string `validate:"required"`
 		} `validate:"required"`
+		// ForgeBatchGasCost contains the cost of each action in the
+		// ForgeBatch transaction.
+		ForgeBatchGasCost ForgeBatchGasCost `validate:"required"`
 	} `validate:"required"`
 	API struct {
 		// Coordinator enables the coordinator API endpoints
@@ -207,17 +227,30 @@ type Node struct {
 		// Keep is the number of checkpoints to keep
 		Keep int `validate:"required"`
 	} `validate:"required"`
+	// It's possible to use diferentiated SQL connections for read/write.
+	// If the read configuration is not provided, the write one it's going to be used
+	// for both reads and writes
 	PostgreSQL struct {
-		// Port of the PostgreSQL server
-		Port int `validate:"required"`
-		// Host of the PostgreSQL server
-		Host string `validate:"required"`
-		// User of the PostgreSQL server
-		User string `validate:"required"`
-		// Password of the PostgreSQL server
-		Password string `validate:"required"`
-		// Name of the PostgreSQL server database
-		Name string `validate:"required"`
+		// Port of the PostgreSQL write server
+		PortWrite int `validate:"required"`
+		// Host of the PostgreSQL write server
+		HostWrite string `validate:"required"`
+		// User of the PostgreSQL write server
+		UserWrite string `validate:"required"`
+		// Password of the PostgreSQL write server
+		PasswordWrite string `validate:"required"`
+		// Name of the PostgreSQL write server database
+		NameWrite string `validate:"required"`
+		// Port of the PostgreSQL read server
+		PortRead int
+		// Host of the PostgreSQL read server
+		HostRead string
+		// User of the PostgreSQL read server
+		UserRead string
+		// Password of the PostgreSQL read server
+		PasswordRead string
+		// Name of the PostgreSQL read server database
+		NameRead string
 	} `validate:"required"`
 	Web3 struct {
 		// URL is the URL of the web3 ethereum-node RPC server

coordinator/coordinator.go

@@ -11,6 +11,7 @@ import (
 	ethCommon "github.com/ethereum/go-ethereum/common"
 	"github.com/hermeznetwork/hermez-node/batchbuilder"
 	"github.com/hermeznetwork/hermez-node/common"
+	"github.com/hermeznetwork/hermez-node/config"
 	"github.com/hermeznetwork/hermez-node/db/historydb"
 	"github.com/hermeznetwork/hermez-node/db/l2db"
 	"github.com/hermeznetwork/hermez-node/eth"
@@ -85,6 +86,10 @@ type Config struct {
 	// SyncRetryInterval is the waiting interval between calls to the main
 	// handler of a synced block after an error
 	SyncRetryInterval time.Duration
+	// PurgeByExtDelInterval is the waiting interval between calls
+	// to the PurgeByExternalDelete function of the l2db which deletes
+	// pending txs externally marked by the column `external_delete`
+	PurgeByExtDelInterval time.Duration
 	// EthClientAttemptsDelay is delay between attempts do do an eth client
 	// RPC call
 	EthClientAttemptsDelay time.Duration
@@ -111,7 +116,10 @@ type Config struct {
 	Purger         PurgerCfg
 	// VerifierIdx is the index of the verifier contract registered in the
 	// smart contract
-	VerifierIdx       uint8
+	VerifierIdx uint8
+	// ForgeBatchGasCost contains the cost of each action in the
+	// ForgeBatch transaction.
+	ForgeBatchGasCost config.ForgeBatchGasCost
 	TxProcessorConfig txprocessor.Config
 }
 
@@ -153,6 +161,15 @@ type Coordinator struct {
 	wg     sync.WaitGroup
 	cancel context.CancelFunc
 
+	// mutexL2DBUpdateDelete protects updates to the L2DB so that
+	// these two processes always happen exclusively:
+	// - Pipeline taking pending txs, running through the TxProcessor and
+	//   marking selected txs as forging
+	// - Coordinator deleting pending txs that have been marked with
+	//   `external_delete`.
+	// Without this mutex, the coordinator could delete a pending txs that
+	// has just been selected by the TxProcessor in the pipeline.
+	mutexL2DBUpdateDelete sync.Mutex
 	pipeline              *Pipeline
 	lastNonFailedBatchNum common.BatchNum
 
@@ -248,7 +265,8 @@ func (c *Coordinator) BatchBuilder() *batchbuilder.BatchBuilder {
 func (c *Coordinator) newPipeline(ctx context.Context) (*Pipeline, error) {
 	c.pipelineNum++
 	return NewPipeline(ctx, c.cfg, c.pipelineNum, c.historyDB, c.l2DB, c.txSelector,
-		c.batchBuilder, c.purger, c, c.txManager, c.provers, &c.consts)
+		c.batchBuilder, &c.mutexL2DBUpdateDelete, c.purger, c, c.txManager,
+		c.provers, &c.consts)
 }
 
 // MsgSyncBlock indicates an update to the Synchronizer stats
@@ -369,11 +387,23 @@ func (c *Coordinator) syncStats(ctx context.Context, stats *synchronizer.Stats)
 				fromBatch.ForgerAddr = c.cfg.ForgerAddress
 				fromBatch.StateRoot = big.NewInt(0)
 			}
+			// Before starting the pipeline make sure we reset any
+			// l2tx from the pool that was forged in a batch that
+			// didn't end up being mined.  We are already doing
+			// this in handleStopPipeline, but we do it again as a
+			// failsafe in case the last synced batchnum is
+			// different than in the previous call to l2DB.Reorg,
+			// or in case the node was restarted when there was a
+			// started batch that included l2txs but was not mined.
+			if err := c.l2DB.Reorg(fromBatch.BatchNum); err != nil {
+				return tracerr.Wrap(err)
+			}
 			var err error
 			if c.pipeline, err = c.newPipeline(ctx); err != nil {
 				return tracerr.Wrap(err)
 			}
 			c.pipelineFromBatch = fromBatch
+			// Start the pipeline
 			if err := c.pipeline.Start(fromBatch.BatchNum, stats, &c.vars); err != nil {
 				c.pipeline = nil
 				return tracerr.Wrap(err)
@@ -494,7 +524,7 @@ func (c *Coordinator) Start() {
 
 	c.wg.Add(1)
 	go func() {
-		waitCh := time.After(longWaitDuration)
+		timer := time.NewTimer(longWaitDuration)
 		for {
 			select {
 			case <-c.ctx.Done():
@@ -506,24 +536,45 @@ func (c *Coordinator) Start() {
 					continue
 				} else if err != nil {
 					log.Errorw("Coordinator.handleMsg", "err", err)
-					waitCh = time.After(c.cfg.SyncRetryInterval)
+					if !timer.Stop() {
+						<-timer.C
+					}
+					timer.Reset(c.cfg.SyncRetryInterval)
 					continue
 				}
-				waitCh = time.After(longWaitDuration)
-			case <-waitCh:
+			case <-timer.C:
+				timer.Reset(longWaitDuration)
 				if !c.stats.Synced() {
-					waitCh = time.After(longWaitDuration)
 					continue
 				}
 				if err := c.syncStats(c.ctx, &c.stats); c.ctx.Err() != nil {
-					waitCh = time.After(longWaitDuration)
 					continue
 				} else if err != nil {
 					log.Errorw("Coordinator.syncStats", "err", err)
-					waitCh = time.After(c.cfg.SyncRetryInterval)
+					if !timer.Stop() {
+						<-timer.C
+					}
+					timer.Reset(c.cfg.SyncRetryInterval)
 					continue
 				}
-				waitCh = time.After(longWaitDuration)
+			}
+		}
+	}()
+
+	c.wg.Add(1)
+	go func() {
+		for {
+			select {
+			case <-c.ctx.Done():
+				log.Info("Coordinator L2DB.PurgeByExternalDelete loop done")
+				c.wg.Done()
+				return
+			case <-time.After(c.cfg.PurgeByExtDelInterval):
+				c.mutexL2DBUpdateDelete.Lock()
+				if err := c.l2DB.PurgeByExternalDelete(); err != nil {
+					log.Errorw("L2DB.PurgeByExternalDelete", "err", err)
+				}
+				c.mutexL2DBUpdateDelete.Unlock()
 			}
 		}
 	}()

coordinator/coordinator_test.go

@@ -105,8 +105,8 @@ func newTestModules(t *testing.T) modules {
 	db, err := dbUtils.InitSQLDB(5432, "localhost", "hermez", pass, "hermez")
 	require.NoError(t, err)
 	test.WipeDB(db)
-	l2DB := l2db.NewL2DB(db, 10, 100, 24*time.Hour, nil)
-	historyDB := historydb.NewHistoryDB(db, nil)
+	l2DB := l2db.NewL2DB(db, db, 10, 100, 0.0, 24*time.Hour, nil)
+	historyDB := historydb.NewHistoryDB(db, db, nil)
 
 	txSelDBPath, err = ioutil.TempDir("", "tmpTxSelDB")
 	require.NoError(t, err)

coordinator/pipeline.go

@@ -45,15 +45,16 @@ type Pipeline struct {
 	errAtBatchNum common.BatchNum
 	lastForgeTime time.Time
 
-	proversPool  *ProversPool
-	provers      []prover.Client
-	coord        *Coordinator
-	txManager    *TxManager
-	historyDB    *historydb.HistoryDB
-	l2DB         *l2db.L2DB
-	txSelector   *txselector.TxSelector
-	batchBuilder *batchbuilder.BatchBuilder
-	purger       *Purger
+	proversPool           *ProversPool
+	provers               []prover.Client
+	coord                 *Coordinator
+	txManager             *TxManager
+	historyDB             *historydb.HistoryDB
+	l2DB                  *l2db.L2DB
+	txSelector            *txselector.TxSelector
+	batchBuilder          *batchbuilder.BatchBuilder
+	mutexL2DBUpdateDelete *sync.Mutex
+	purger                *Purger
 
 	stats       synchronizer.Stats
 	vars        synchronizer.SCVariables
@@ -84,6 +85,7 @@ func NewPipeline(ctx context.Context,
 	l2DB *l2db.L2DB,
 	txSelector *txselector.TxSelector,
 	batchBuilder *batchbuilder.BatchBuilder,
+	mutexL2DBUpdateDelete *sync.Mutex,
 	purger *Purger,
 	coord *Coordinator,
 	txManager *TxManager,
@@ -104,19 +106,20 @@ func NewPipeline(ctx context.Context,
 		return nil, tracerr.Wrap(fmt.Errorf("no provers in the pool"))
 	}
 	return &Pipeline{
-		num:          num,
-		cfg:          cfg,
-		historyDB:    historyDB,
-		l2DB:         l2DB,
-		txSelector:   txSelector,
-		batchBuilder: batchBuilder,
-		provers:      provers,
-		proversPool:  proversPool,
-		purger:       purger,
-		coord:        coord,
-		txManager:    txManager,
-		consts:       *scConsts,
-		statsVarsCh:  make(chan statsVars, queueLen),
+		num:                   num,
+		cfg:                   cfg,
+		historyDB:             historyDB,
+		l2DB:                  l2DB,
+		txSelector:            txSelector,
+		batchBuilder:          batchBuilder,
+		provers:               provers,
+		proversPool:           proversPool,
+		mutexL2DBUpdateDelete: mutexL2DBUpdateDelete,
+		purger:                purger,
+		coord:                 coord,
+		txManager:             txManager,
+		consts:                *scConsts,
+		statsVarsCh:           make(chan statsVars, queueLen),
 	}, nil
 }
 
@@ -195,11 +198,34 @@ func (p *Pipeline) syncSCVars(vars synchronizer.SCVariablesPtr) {
 	updateSCVars(&p.vars, vars)
 }
 
-// handleForgeBatch calls p.forgeBatch to forge the batch and get the zkInputs,
-// and then waits for an available proof server and sends the zkInputs to it so
-// that the proof computation begins.
-func (p *Pipeline) handleForgeBatch(ctx context.Context, batchNum common.BatchNum) (*BatchInfo, error) {
-	batchInfo, err := p.forgeBatch(batchNum)
+// handleForgeBatch waits for an available proof server, calls p.forgeBatch to
+// forge the batch and get the zkInputs, and then  sends the zkInputs to the
+// selected proof server so that the proof computation begins.
+func (p *Pipeline) handleForgeBatch(ctx context.Context,
+	batchNum common.BatchNum) (batchInfo *BatchInfo, err error) {
+	// 1. Wait for an available serverProof (blocking call)
+	serverProof, err := p.proversPool.Get(ctx)
+	if ctx.Err() != nil {
+		return nil, ctx.Err()
+	} else if err != nil {
+		log.Errorw("proversPool.Get", "err", err)
+		return nil, err
+	}
+	defer func() {
+		// If we encounter any error (notice that this function returns
+		// errors to notify that a batch is not forged not only because
+		// of unexpected errors but also due to benign causes), add the
+		// serverProof back to the pool
+		if err != nil {
+			p.proversPool.Add(ctx, serverProof)
+		}
+	}()
+
+	// 2. Forge the batch internally (make a selection of txs and prepare
+	// all the smart contract arguments)
+	p.mutexL2DBUpdateDelete.Lock()
+	batchInfo, err = p.forgeBatch(batchNum)
+	p.mutexL2DBUpdateDelete.Unlock()
 	if ctx.Err() != nil {
 		return nil, ctx.Err()
 	} else if err != nil {
@@ -215,21 +241,13 @@ func (p *Pipeline) handleForgeBatch(ctx context.Context, batchNum common.BatchNu
 		}
 		return nil, err
 	}
-	// 6. Wait for an available server proof (blocking call)
-	serverProof, err := p.proversPool.Get(ctx)
-	if ctx.Err() != nil {
-		return nil, ctx.Err()
-	} else if err != nil {
-		log.Errorw("proversPool.Get", "err", err)
-		return nil, err
-	}
+
+	// 3. Send the ZKInputs to the proof server
 	batchInfo.ServerProof = serverProof
 	if err := p.sendServerProof(ctx, batchInfo); ctx.Err() != nil {
 		return nil, ctx.Err()
 	} else if err != nil {
 		log.Errorw("sendServerProof", "err", err)
-		batchInfo.ServerProof = nil
-		p.proversPool.Add(ctx, serverProof)
 		return nil, err
 	}
 	return batchInfo, nil
@@ -253,7 +271,7 @@ func (p *Pipeline) Start(batchNum common.BatchNum,
 
 	p.wg.Add(1)
 	go func() {
-		waitCh := time.After(zeroDuration)
+		timer := time.NewTimer(zeroDuration)
 		for {
 			select {
 			case <-p.ctx.Done():
@@ -263,23 +281,21 @@ func (p *Pipeline) Start(batchNum common.BatchNum,
 			case statsVars := <-p.statsVarsCh:
 				p.stats = statsVars.Stats
 				p.syncSCVars(statsVars.Vars)
-			case <-waitCh:
+			case <-timer.C:
+				timer.Reset(p.cfg.ForgeRetryInterval)
 				// Once errAtBatchNum != 0, we stop forging
 				// batches because there's been an error and we
 				// wait for the pipeline to be stopped.
 				if p.getErrAtBatchNum() != 0 {
-					waitCh = time.After(p.cfg.ForgeRetryInterval)
 					continue
 				}
 				batchNum = p.state.batchNum + 1
 				batchInfo, err := p.handleForgeBatch(p.ctx, batchNum)
 				if p.ctx.Err() != nil {
-					waitCh = time.After(p.cfg.ForgeRetryInterval)
 					continue
 				} else if tracerr.Unwrap(err) == errLastL1BatchNotSynced ||
 					tracerr.Unwrap(err) == errForgeNoTxsBeforeDelay ||
 					tracerr.Unwrap(err) == errForgeBeforeDelay {
-					waitCh = time.After(p.cfg.ForgeRetryInterval)
 					continue
 				} else if err != nil {
 					p.setErrAtBatchNum(batchNum)
@@ -288,7 +304,6 @@ func (p *Pipeline) Start(batchNum common.BatchNum,
 							"Pipeline.handleForgBatch: %v", err),
 						FailedBatchNum: batchNum,
 					})
-					waitCh = time.After(p.cfg.ForgeRetryInterval)
 					continue
 				}
 				p.lastForgeTime = time.Now()
@@ -298,7 +313,10 @@ func (p *Pipeline) Start(batchNum common.BatchNum,
 				case batchChSentServerProof <- batchInfo:
 				case <-p.ctx.Done():
 				}
-				waitCh = time.After(zeroDuration)
+				if !timer.Stop() {
+					<-timer.C
+				}
+				timer.Reset(zeroDuration)
 			}
 		}
 	}()
@@ -333,7 +351,6 @@ func (p *Pipeline) Start(batchNum common.BatchNum,
 				}
 				// We are done with this serverProof, add it back to the pool
 				p.proversPool.Add(p.ctx, batchInfo.ServerProof)
-				// batchInfo.ServerProof = nil
 				p.txManager.AddBatch(p.ctx, batchInfo)
 			}
 		}

coordinator/purger_test.go

@@ -21,7 +21,7 @@ func newL2DB(t *testing.T) *l2db.L2DB {
 	db, err := dbUtils.InitSQLDB(5432, "localhost", "hermez", pass, "hermez")
 	require.NoError(t, err)
 	test.WipeDB(db)
-	return l2db.NewL2DB(db, 10, 100, 24*time.Hour, nil)
+	return l2db.NewL2DB(db, db, 10, 100, 0.0, 24*time.Hour, nil)
 }
 
 func newStateDB(t *testing.T) *statedb.LocalStateDB {

coordinator/txmanager.go

@@ -2,9 +2,9 @@ package coordinator
 
 import (
 	"context"
-	"errors"
 	"fmt"
 	"math/big"
+	"strings"
 	"time"
 
 	"github.com/ethereum/go-ethereum"
@@ -123,7 +123,7 @@ func (t *TxManager) syncSCVars(vars synchronizer.SCVariablesPtr) {
 }
 
 // NewAuth generates a new auth object for an ethereum transaction
-func (t *TxManager) NewAuth(ctx context.Context) (*bind.TransactOpts, error) {
+func (t *TxManager) NewAuth(ctx context.Context, batchInfo *BatchInfo) (*bind.TransactOpts, error) {
 	gasPrice, err := t.ethClient.EthSuggestGasPrice(ctx)
 	if err != nil {
 		return nil, tracerr.Wrap(err)
@@ -143,15 +143,12 @@ func (t *TxManager) NewAuth(ctx context.Context) (*bind.TransactOpts, error) {
 		return nil, tracerr.Wrap(err)
 	}
 	auth.Value = big.NewInt(0) // in wei
-	// TODO: Calculate GasLimit based on the contents of the ForgeBatchArgs
-	// This requires a function that estimates the gas usage of the
-	// forgeBatch call based on the contents of the ForgeBatch args:
-	// - length of l2txs
-	// - length of l1Usertxs
-	// - length of l1CoordTxs with authorization signature
-	// - length of l1CoordTxs without authoriation signature
-	// - etc.
-	auth.GasLimit = 1000000
+
+	gasLimit := t.cfg.ForgeBatchGasCost.Fixed +
+		uint64(len(batchInfo.L1UserTxsExtra))*t.cfg.ForgeBatchGasCost.L1UserTx +
+		uint64(len(batchInfo.L1CoordTxs))*t.cfg.ForgeBatchGasCost.L1CoordTx +
+		uint64(len(batchInfo.L2Txs))*t.cfg.ForgeBatchGasCost.L2Tx
+	auth.GasLimit = gasLimit
 	auth.GasPrice = gasPrice
 	auth.Nonce = nil
 
@@ -191,7 +188,7 @@ func addPerc(v *big.Int, p int64) *big.Int {
 func (t *TxManager) sendRollupForgeBatch(ctx context.Context, batchInfo *BatchInfo, resend bool) error {
 	var ethTx *types.Transaction
 	var err error
-	auth, err := t.NewAuth(ctx)
+	auth, err := t.NewAuth(ctx, batchInfo)
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
@@ -206,32 +203,35 @@ func (t *TxManager) sendRollupForgeBatch(ctx context.Context, batchInfo *BatchIn
 		}
 		// RollupForgeBatch() calls ethclient.SendTransaction()
 		ethTx, err = t.ethClient.RollupForgeBatch(batchInfo.ForgeBatchArgs, auth)
-		if errors.Is(err, core.ErrNonceTooLow) {
+		// We check the errors via strings because we match the
+		// definition of the error from geth, with the string returned
+		// via RPC obtained by the client.
+		if err == nil {
+			break
+		} else if strings.Contains(err.Error(), core.ErrNonceTooLow.Error()) {
 			log.Warnw("TxManager ethClient.RollupForgeBatch incrementing nonce",
 				"err", err, "nonce", auth.Nonce, "batchNum", batchInfo.BatchNum)
 			auth.Nonce.Add(auth.Nonce, big.NewInt(1))
 			attempt--
-		} else if errors.Is(err, core.ErrNonceTooHigh) {
+		} else if strings.Contains(err.Error(), core.ErrNonceTooHigh.Error()) {
 			log.Warnw("TxManager ethClient.RollupForgeBatch decrementing nonce",
 				"err", err, "nonce", auth.Nonce, "batchNum", batchInfo.BatchNum)
 			auth.Nonce.Sub(auth.Nonce, big.NewInt(1))
 			attempt--
-		} else if errors.Is(err, core.ErrUnderpriced) {
+		} else if strings.Contains(err.Error(), core.ErrReplaceUnderpriced.Error()) {
 			log.Warnw("TxManager ethClient.RollupForgeBatch incrementing gasPrice",
 				"err", err, "gasPrice", auth.GasPrice, "batchNum", batchInfo.BatchNum)
 			auth.GasPrice = addPerc(auth.GasPrice, 10)
 			attempt--
-		} else if errors.Is(err, core.ErrReplaceUnderpriced) {
+		} else if strings.Contains(err.Error(), core.ErrUnderpriced.Error()) {
 			log.Warnw("TxManager ethClient.RollupForgeBatch incrementing gasPrice",
 				"err", err, "gasPrice", auth.GasPrice, "batchNum", batchInfo.BatchNum)
 			auth.GasPrice = addPerc(auth.GasPrice, 10)
 			attempt--
-		} else if err != nil {
+		} else {
 			log.Errorw("TxManager ethClient.RollupForgeBatch",
 				"attempt", attempt, "err", err, "block", t.stats.Eth.LastBlock.Num+1,
 				"batchNum", batchInfo.BatchNum)
-		} else {
-			break
 		}
 		select {
 		case <-ctx.Done():
@@ -416,8 +416,6 @@ func (q *Queue) Push(batchInfo *BatchInfo) {
 
 // Run the TxManager
 func (t *TxManager) Run(ctx context.Context) {
-	waitCh := time.After(longWaitDuration)
-
 	var statsVars statsVars
 	select {
 	case statsVars = <-t.statsVarsCh:
@@ -428,6 +426,7 @@ func (t *TxManager) Run(ctx context.Context) {
 	log.Infow("TxManager: received initial statsVars",
 		"block", t.stats.Eth.LastBlock.Num, "batch", t.stats.Eth.LastBatchNum)
 
+	timer := time.NewTimer(longWaitDuration)
 	for {
 		select {
 		case <-ctx.Done():
@@ -471,13 +470,17 @@ func (t *TxManager) Run(ctx context.Context) {
 				continue
 			}
 			t.queue.Push(batchInfo)
-			waitCh = time.After(t.cfg.TxManagerCheckInterval)
-		case <-waitCh:
+			if !timer.Stop() {
+				<-timer.C
+			}
+			timer.Reset(t.cfg.TxManagerCheckInterval)
+		case <-timer.C:
 			queuePosition, batchInfo := t.queue.Next()
 			if batchInfo == nil {
-				waitCh = time.After(longWaitDuration)
+				timer.Reset(longWaitDuration)
 				continue
 			}
+			timer.Reset(t.cfg.TxManagerCheckInterval)
 			if err := t.checkEthTransactionReceipt(ctx, batchInfo); ctx.Err() != nil {
 				continue
 			} else if err != nil { //nolint:staticcheck

db/historydb/apiqueries.go

@@ -34,7 +34,7 @@ func (hdb *HistoryDB) GetBatchAPI(batchNum common.BatchNum) (*BatchAPI, error) {
 	defer hdb.apiConnCon.Release()
 	batch := &BatchAPI{}
 	return batch, tracerr.Wrap(meddler.QueryRow(
-		hdb.db, batch,
+		hdb.dbRead, batch,
 		`SELECT batch.item_id, batch.batch_num, batch.eth_block_num,
 		batch.forger_addr, batch.fees_collected, batch.total_fees_usd, batch.state_root,
 		batch.num_accounts, batch.exit_root, batch.forge_l1_txs_num, batch.slot_num,
@@ -133,10 +133,10 @@ func (hdb *HistoryDB) GetBatchesAPI(
 		queryStr += " DESC "
 	}
 	queryStr += fmt.Sprintf("LIMIT %d;", *limit)
-	query = hdb.db.Rebind(queryStr)
+	query = hdb.dbRead.Rebind(queryStr)
 	// log.Debug(query)
 	batchPtrs := []*BatchAPI{}
-	if err := meddler.QueryAll(hdb.db, &batchPtrs, query, args...); err != nil {
+	if err := meddler.QueryAll(hdb.dbRead, &batchPtrs, query, args...); err != nil {
 		return nil, 0, tracerr.Wrap(err)
 	}
 	batches := db.SlicePtrsToSlice(batchPtrs).([]BatchAPI)
@@ -156,7 +156,7 @@ func (hdb *HistoryDB) GetBestBidAPI(slotNum *int64) (BidAPI, error) {
 	}
 	defer hdb.apiConnCon.Release()
 	err = meddler.QueryRow(
-		hdb.db, bid, `SELECT bid.*, block.timestamp, coordinator.forger_addr, coordinator.url 
+		hdb.dbRead, bid, `SELECT bid.*, block.timestamp, coordinator.forger_addr, coordinator.url 
 		FROM bid INNER JOIN block ON bid.eth_block_num = block.eth_block_num
 		INNER JOIN (
 			SELECT bidder_addr, MAX(item_id) AS item_id FROM coordinator
@@ -212,9 +212,9 @@ func (hdb *HistoryDB) GetBestBidsAPI(
 	if limit != nil {
 		queryStr += fmt.Sprintf("LIMIT %d;", *limit)
 	}
-	query = hdb.db.Rebind(queryStr)
+	query = hdb.dbRead.Rebind(queryStr)
 	bidPtrs := []*BidAPI{}
-	if err := meddler.QueryAll(hdb.db, &bidPtrs, query, args...); err != nil {
+	if err := meddler.QueryAll(hdb.dbRead, &bidPtrs, query, args...); err != nil {
 		return nil, 0, tracerr.Wrap(err)
 	}
 	// log.Debug(query)
@@ -296,9 +296,9 @@ func (hdb *HistoryDB) GetBidsAPI(
 	if err != nil {
 		return nil, 0, tracerr.Wrap(err)
 	}
-	query = hdb.db.Rebind(query)
+	query = hdb.dbRead.Rebind(query)
 	bids := []*BidAPI{}
-	if err := meddler.QueryAll(hdb.db, &bids, query, argsQ...); err != nil {
+	if err := meddler.QueryAll(hdb.dbRead, &bids, query, argsQ...); err != nil {
 		return nil, 0, tracerr.Wrap(err)
 	}
 	if len(bids) == 0 {
@@ -384,9 +384,9 @@ func (hdb *HistoryDB) GetTokensAPI(
 	if err != nil {
 		return nil, 0, tracerr.Wrap(err)
 	}
-	query = hdb.db.Rebind(query)
+	query = hdb.dbRead.Rebind(query)
 	tokens := []*TokenWithUSD{}
-	if err := meddler.QueryAll(hdb.db, &tokens, query, argsQ...); err != nil {
+	if err := meddler.QueryAll(hdb.dbRead, &tokens, query, argsQ...); err != nil {
 		return nil, 0, tracerr.Wrap(err)
 	}
 	if len(tokens) == 0 {
@@ -408,7 +408,7 @@ func (hdb *HistoryDB) GetTxAPI(txID common.TxID) (*TxAPI, error) {
 	defer hdb.apiConnCon.Release()
 	tx := &TxAPI{}
 	err = meddler.QueryRow(
-		hdb.db, tx, `SELECT tx.item_id, tx.is_l1, tx.id, tx.type, tx.position, 
+		hdb.dbRead, tx, `SELECT tx.item_id, tx.is_l1, tx.id, tx.type, tx.position, 
 		hez_idx(tx.effective_from_idx, token.symbol) AS from_idx, tx.from_eth_addr, tx.from_bjj,
 		hez_idx(tx.to_idx, token.symbol) AS to_idx, tx.to_eth_addr, tx.to_bjj,
 		tx.amount, tx.amount_success, tx.token_id, tx.amount_usd, 
@@ -541,10 +541,10 @@ func (hdb *HistoryDB) GetTxsAPI(
 		queryStr += " DESC "
 	}
 	queryStr += fmt.Sprintf("LIMIT %d;", *limit)
-	query = hdb.db.Rebind(queryStr)
+	query = hdb.dbRead.Rebind(queryStr)
 	// log.Debug(query)
 	txsPtrs := []*TxAPI{}
-	if err := meddler.QueryAll(hdb.db, &txsPtrs, query, args...); err != nil {
+	if err := meddler.QueryAll(hdb.dbRead, &txsPtrs, query, args...); err != nil {
 		return nil, 0, tracerr.Wrap(err)
 	}
 	txs := db.SlicePtrsToSlice(txsPtrs).([]TxAPI)
@@ -564,7 +564,7 @@ func (hdb *HistoryDB) GetExitAPI(batchNum *uint, idx *common.Idx) (*ExitAPI, err
 	defer hdb.apiConnCon.Release()
 	exit := &ExitAPI{}
 	err = meddler.QueryRow(
-		hdb.db, exit, `SELECT exit_tree.item_id, exit_tree.batch_num,
+		hdb.dbRead, exit, `SELECT exit_tree.item_id, exit_tree.batch_num,
 		hez_idx(exit_tree.account_idx, token.symbol) AS account_idx,
 		account.bjj, account.eth_addr,
 		exit_tree.merkle_proof, exit_tree.balance, exit_tree.instant_withdrawn,
@@ -685,10 +685,10 @@ func (hdb *HistoryDB) GetExitsAPI(
 		queryStr += " DESC "
 	}
 	queryStr += fmt.Sprintf("LIMIT %d;", *limit)
-	query = hdb.db.Rebind(queryStr)
+	query = hdb.dbRead.Rebind(queryStr)
 	// log.Debug(query)
 	exits := []*ExitAPI{}
-	if err := meddler.QueryAll(hdb.db, &exits, query, args...); err != nil {
+	if err := meddler.QueryAll(hdb.dbRead, &exits, query, args...); err != nil {
 		return nil, 0, tracerr.Wrap(err)
 	}
 	if len(exits) == 0 {
@@ -707,7 +707,7 @@ func (hdb *HistoryDB) GetBucketUpdatesAPI() ([]BucketUpdateAPI, error) {
 	defer hdb.apiConnCon.Release()
 	var bucketUpdates []*BucketUpdateAPI
 	err = meddler.QueryAll(
-		hdb.db, &bucketUpdates,
+		hdb.dbRead, &bucketUpdates,
 		`SELECT num_bucket, withdrawals FROM bucket_update 
 		WHERE item_id in(SELECT max(item_id) FROM bucket_update 
 		group by num_bucket) 
@@ -772,10 +772,10 @@ func (hdb *HistoryDB) GetCoordinatorsAPI(
 		queryStr += " DESC "
 	}
 	queryStr += fmt.Sprintf("LIMIT %d;", *limit)
-	query = hdb.db.Rebind(queryStr)
+	query = hdb.dbRead.Rebind(queryStr)
 
 	coordinators := []*CoordinatorAPI{}
-	if err := meddler.QueryAll(hdb.db, &coordinators, query, args...); err != nil {
+	if err := meddler.QueryAll(hdb.dbRead, &coordinators, query, args...); err != nil {
 		return nil, 0, tracerr.Wrap(err)
 	}
 	if len(coordinators) == 0 {
@@ -795,7 +795,7 @@ func (hdb *HistoryDB) GetAuctionVarsAPI() (*common.AuctionVariables, error) {
 	defer hdb.apiConnCon.Release()
 	auctionVars := &common.AuctionVariables{}
 	err = meddler.QueryRow(
-		hdb.db, auctionVars, `SELECT * FROM auction_vars;`,
+		hdb.dbRead, auctionVars, `SELECT * FROM auction_vars;`,
 	)
 	return auctionVars, tracerr.Wrap(err)
 }
@@ -816,7 +816,7 @@ func (hdb *HistoryDB) GetAuctionVarsUntilSetSlotNumAPI(slotNum int64, maxItems i
 		ORDER BY default_slot_set_bid_slot_num DESC
 		LIMIT $2;
 	`
-	err = meddler.QueryAll(hdb.db, &auctionVars, query, slotNum, maxItems)
+	err = meddler.QueryAll(hdb.dbRead, &auctionVars, query, slotNum, maxItems)
 	if err != nil {
 		return nil, tracerr.Wrap(err)
 	}
@@ -832,11 +832,19 @@ func (hdb *HistoryDB) GetAccountAPI(idx common.Idx) (*AccountAPI, error) {
 	}
 	defer hdb.apiConnCon.Release()
 	account := &AccountAPI{}
-	err = meddler.QueryRow(hdb.db, account, `SELECT account.item_id, hez_idx(account.idx, 
-	token.symbol) as idx, account.batch_num, account.bjj, account.eth_addr,
-	token.token_id, token.item_id AS token_item_id, token.eth_block_num AS token_block,
-	token.eth_addr as token_eth_addr, token.name, token.symbol, token.decimals, token.usd, token.usd_update 
-	FROM account INNER JOIN token ON account.token_id = token.token_id WHERE idx = $1;`, idx)
+	err = meddler.QueryRow(hdb.dbRead, account, `SELECT account.item_id, hez_idx(account.idx, 
+		token.symbol) as idx, account.batch_num, account.bjj, account.eth_addr,
+		token.token_id, token.item_id AS token_item_id, token.eth_block_num AS token_block,
+		token.eth_addr as token_eth_addr, token.name, token.symbol, token.decimals, token.usd,
+		token.usd_update, account_update.nonce, account_update.balance 
+		FROM account inner JOIN (
+			SELECT idx, nonce, balance 
+			FROM account_update
+			WHERE idx = $1
+			ORDER BY item_id DESC LIMIT 1
+		) AS account_update ON account_update.idx = account.idx 
+		INNER JOIN token ON account.token_id = token.token_id
+		WHERE account.idx = $1;`, idx)
 
 	if err != nil {
 		return nil, tracerr.Wrap(err)
@@ -864,8 +872,13 @@ func (hdb *HistoryDB) GetAccountsAPI(
 	queryStr := `SELECT account.item_id, hez_idx(account.idx, token.symbol) as idx, account.batch_num, 
 	account.bjj, account.eth_addr, token.token_id, token.item_id AS token_item_id, token.eth_block_num AS token_block,
 	token.eth_addr as token_eth_addr, token.name, token.symbol, token.decimals, token.usd, token.usd_update, 
-	COUNT(*) OVER() AS total_items
-	FROM account INNER JOIN token ON account.token_id = token.token_id `
+	account_update.nonce, account_update.balance, COUNT(*) OVER() AS total_items
+	FROM account inner JOIN (
+		SELECT DISTINCT idx,
+		first_value(nonce) over(partition by idx ORDER BY item_id DESC) as nonce,
+		first_value(balance) over(partition by idx ORDER BY item_id DESC) as balance
+		FROM account_update
+	) AS account_update ON account_update.idx = account.idx INNER JOIN token ON account.token_id = token.token_id `
 	// Apply filters
 	nextIsAnd := false
 	// ethAddr filter
@@ -914,10 +927,10 @@ func (hdb *HistoryDB) GetAccountsAPI(
 	if err != nil {
 		return nil, 0, tracerr.Wrap(err)
 	}
-	query = hdb.db.Rebind(query)
+	query = hdb.dbRead.Rebind(query)
 
 	accounts := []*AccountAPI{}
-	if err := meddler.QueryAll(hdb.db, &accounts, query, argsQ...); err != nil {
+	if err := meddler.QueryAll(hdb.dbRead, &accounts, query, argsQ...); err != nil {
 		return nil, 0, tracerr.Wrap(err)
 	}
 	if len(accounts) == 0 {
@@ -939,11 +952,19 @@ func (hdb *HistoryDB) GetMetricsAPI(lastBatchNum common.BatchNum) (*Metrics, err
 	metricsTotals := &MetricsTotals{}
 	metrics := &Metrics{}
 	err = meddler.QueryRow(
-		hdb.db, metricsTotals, `SELECT COUNT(tx.*) as total_txs,
-		COALESCE (MIN(tx.batch_num), 0) as batch_num, COALESCE (MIN(block.timestamp), 
-		NOW()) AS min_timestamp, COALESCE (MAX(block.timestamp), NOW()) AS max_timestamp
-		FROM tx INNER JOIN block ON tx.eth_block_num = block.eth_block_num
-		WHERE block.timestamp >= NOW() - INTERVAL '24 HOURS';`)
+		hdb.dbRead, metricsTotals, `SELECT
+		COALESCE (MIN(batch.batch_num), 0) as batch_num,
+		COALESCE (MIN(block.timestamp), NOW()) AS min_timestamp, 
+		COALESCE (MAX(block.timestamp), NOW()) AS max_timestamp
+		FROM batch INNER JOIN block ON batch.eth_block_num = block.eth_block_num
+		WHERE block.timestamp >= NOW() - INTERVAL '24 HOURS' and batch.batch_num <= $1;`, lastBatchNum)
+	if err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+
+	err = meddler.QueryRow(
+		hdb.dbRead, metricsTotals, `SELECT COUNT(*) as total_txs
+		FROM tx	WHERE tx.batch_num between $1 AND $2;`, metricsTotals.FirstBatchNum, lastBatchNum)
 	if err != nil {
 		return nil, tracerr.Wrap(err)
 	}
@@ -964,12 +985,13 @@ func (hdb *HistoryDB) GetMetricsAPI(lastBatchNum common.BatchNum) (*Metrics, err
 	}
 
 	err = meddler.QueryRow(
-		hdb.db, metricsTotals, `SELECT COUNT(*) AS total_batches, 
+		hdb.dbRead, metricsTotals, `SELECT COUNT(*) AS total_batches, 
 		COALESCE (SUM(total_fees_usd), 0) AS total_fees FROM batch 
-		WHERE batch_num > $1;`, metricsTotals.FirstBatchNum)
+		WHERE batch_num between $1 and $2;`, metricsTotals.FirstBatchNum, lastBatchNum)
 	if err != nil {
 		return nil, tracerr.Wrap(err)
 	}
+
 	if metricsTotals.TotalBatches > 0 {
 		metrics.BatchFrequency = seconds / float64(metricsTotals.TotalBatches)
 	} else {
@@ -981,7 +1003,7 @@ func (hdb *HistoryDB) GetMetricsAPI(lastBatchNum common.BatchNum) (*Metrics, err
 		metrics.AvgTransactionFee = 0
 	}
 	err = meddler.QueryRow(
-		hdb.db, metrics,
+		hdb.dbRead, metrics,
 		`SELECT COUNT(*) AS total_bjjs, COUNT(DISTINCT(bjj)) AS total_accounts FROM account;`)
 	if err != nil {
 		return nil, tracerr.Wrap(err)
@@ -1000,7 +1022,7 @@ func (hdb *HistoryDB) GetAvgTxFeeAPI() (float64, error) {
 	defer hdb.apiConnCon.Release()
 	metricsTotals := &MetricsTotals{}
 	err = meddler.QueryRow(
-		hdb.db, metricsTotals, `SELECT COUNT(tx.*) as total_txs, 
+		hdb.dbRead, metricsTotals, `SELECT COUNT(tx.*) as total_txs, 
 		COALESCE (MIN(tx.batch_num), 0) as batch_num 
 		FROM tx INNER JOIN block ON tx.eth_block_num = block.eth_block_num
 		WHERE block.timestamp >= NOW() - INTERVAL '1 HOURS';`)
@@ -1008,7 +1030,7 @@ func (hdb *HistoryDB) GetAvgTxFeeAPI() (float64, error) {
 		return 0, tracerr.Wrap(err)
 	}
 	err = meddler.QueryRow(
-		hdb.db, metricsTotals, `SELECT COUNT(*) AS total_batches, 
+		hdb.dbRead, metricsTotals, `SELECT COUNT(*) AS total_batches, 
 		COALESCE (SUM(total_fees_usd), 0) AS total_fees FROM batch 
 		WHERE batch_num > $1;`, metricsTotals.FirstBatchNum)
 	if err != nil {
@@ -1024,3 +1046,18 @@ func (hdb *HistoryDB) GetAvgTxFeeAPI() (float64, error) {
 
 	return avgTransactionFee, nil
 }
+
+// GetCommonAccountAPI returns the account associated to an account idx
+func (hdb *HistoryDB) GetCommonAccountAPI(idx common.Idx) (*common.Account, error) {
+	cancel, err := hdb.apiConnCon.Acquire()
+	defer cancel()
+	if err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+	defer hdb.apiConnCon.Release()
+	account := &common.Account{}
+	err = meddler.QueryRow(
+		hdb.dbRead, account, `SELECT * FROM account WHERE idx = $1;`, idx,
+	)
+	return account, tracerr.Wrap(err)
+}

db/historydb/historydb.go

@@ -27,30 +27,35 @@ const (
 
 // HistoryDB persist the historic of the rollup
 type HistoryDB struct {
-	db         *sqlx.DB
+	dbRead     *sqlx.DB
+	dbWrite    *sqlx.DB
 	apiConnCon *db.APIConnectionController
 }
 
 // NewHistoryDB initialize the DB
-func NewHistoryDB(db *sqlx.DB, apiConnCon *db.APIConnectionController) *HistoryDB {
-	return &HistoryDB{db: db, apiConnCon: apiConnCon}
+func NewHistoryDB(dbRead, dbWrite *sqlx.DB, apiConnCon *db.APIConnectionController) *HistoryDB {
+	return &HistoryDB{
+		dbRead:     dbRead,
+		dbWrite:    dbWrite,
+		apiConnCon: apiConnCon,
+	}
 }
 
 // DB returns a pointer to the L2DB.db. This method should be used only for
 // internal testing purposes.
 func (hdb *HistoryDB) DB() *sqlx.DB {
-	return hdb.db
+	return hdb.dbWrite
 }
 
 // AddBlock insert a block into the DB
-func (hdb *HistoryDB) AddBlock(block *common.Block) error { return hdb.addBlock(hdb.db, block) }
+func (hdb *HistoryDB) AddBlock(block *common.Block) error { return hdb.addBlock(hdb.dbWrite, block) }
 func (hdb *HistoryDB) addBlock(d meddler.DB, block *common.Block) error {
 	return tracerr.Wrap(meddler.Insert(d, "block", block))
 }
 
 // AddBlocks inserts blocks into the DB
 func (hdb *HistoryDB) AddBlocks(blocks []common.Block) error {
-	return tracerr.Wrap(hdb.addBlocks(hdb.db, blocks))
+	return tracerr.Wrap(hdb.addBlocks(hdb.dbWrite, blocks))
 }
 
 func (hdb *HistoryDB) addBlocks(d meddler.DB, blocks []common.Block) error {
@@ -61,7 +66,7 @@ func (hdb *HistoryDB) addBlocks(d meddler.DB, blocks []common.Block) error {
 			timestamp,
 			hash
 		) VALUES %s;`,
-		blocks[:],
+		blocks,
 	))
 }
 
@@ -69,7 +74,7 @@ func (hdb *HistoryDB) addBlocks(d meddler.DB, blocks []common.Block) error {
 func (hdb *HistoryDB) GetBlock(blockNum int64) (*common.Block, error) {
 	block := &common.Block{}
 	err := meddler.QueryRow(
-		hdb.db, block,
+		hdb.dbRead, block,
 		"SELECT * FROM block WHERE eth_block_num = $1;", blockNum,
 	)
 	return block, tracerr.Wrap(err)
@@ -79,7 +84,7 @@ func (hdb *HistoryDB) GetBlock(blockNum int64) (*common.Block, error) {
 func (hdb *HistoryDB) GetAllBlocks() ([]common.Block, error) {
 	var blocks []*common.Block
 	err := meddler.QueryAll(
-		hdb.db, &blocks,
+		hdb.dbRead, &blocks,
 		"SELECT * FROM block ORDER BY eth_block_num;",
 	)
 	return db.SlicePtrsToSlice(blocks).([]common.Block), tracerr.Wrap(err)
@@ -89,7 +94,7 @@ func (hdb *HistoryDB) GetAllBlocks() ([]common.Block, error) {
 func (hdb *HistoryDB) getBlocks(from, to int64) ([]common.Block, error) {
 	var blocks []*common.Block
 	err := meddler.QueryAll(
-		hdb.db, &blocks,
+		hdb.dbRead, &blocks,
 		"SELECT * FROM block WHERE $1 <= eth_block_num AND eth_block_num < $2 ORDER BY eth_block_num;",
 		from, to,
 	)
@@ -100,13 +105,13 @@ func (hdb *HistoryDB) getBlocks(from, to int64) ([]common.Block, error) {
 func (hdb *HistoryDB) GetLastBlock() (*common.Block, error) {
 	block := &common.Block{}
 	err := meddler.QueryRow(
-		hdb.db, block, "SELECT * FROM block ORDER BY eth_block_num DESC LIMIT 1;",
+		hdb.dbRead, block, "SELECT * FROM block ORDER BY eth_block_num DESC LIMIT 1;",
 	)
 	return block, tracerr.Wrap(err)
 }
 
 // AddBatch insert a Batch into the DB
-func (hdb *HistoryDB) AddBatch(batch *common.Batch) error { return hdb.addBatch(hdb.db, batch) }
+func (hdb *HistoryDB) AddBatch(batch *common.Batch) error { return hdb.addBatch(hdb.dbWrite, batch) }
 func (hdb *HistoryDB) addBatch(d meddler.DB, batch *common.Batch) error {
 	// Calculate total collected fees in USD
 	// Get IDs of collected tokens for fees
@@ -129,9 +134,9 @@ func (hdb *HistoryDB) addBatch(d meddler.DB, batch *common.Batch) error {
 		if err != nil {
 			return tracerr.Wrap(err)
 		}
-		query = hdb.db.Rebind(query)
+		query = hdb.dbWrite.Rebind(query)
 		if err := meddler.QueryAll(
-			hdb.db, &tokenPrices, query, args...,
+			hdb.dbWrite, &tokenPrices, query, args...,
 		); err != nil {
 			return tracerr.Wrap(err)
 		}
@@ -153,7 +158,7 @@ func (hdb *HistoryDB) addBatch(d meddler.DB, batch *common.Batch) error {
 
 // AddBatches insert Bids into the DB
 func (hdb *HistoryDB) AddBatches(batches []common.Batch) error {
-	return tracerr.Wrap(hdb.addBatches(hdb.db, batches))
+	return tracerr.Wrap(hdb.addBatches(hdb.dbWrite, batches))
 }
 func (hdb *HistoryDB) addBatches(d meddler.DB, batches []common.Batch) error {
 	for i := 0; i < len(batches); i++ {
@@ -168,7 +173,7 @@ func (hdb *HistoryDB) addBatches(d meddler.DB, batches []common.Batch) error {
 func (hdb *HistoryDB) GetBatch(batchNum common.BatchNum) (*common.Batch, error) {
 	var batch common.Batch
 	err := meddler.QueryRow(
-		hdb.db, &batch, `SELECT batch.batch_num, batch.eth_block_num, batch.forger_addr,
+		hdb.dbRead, &batch, `SELECT batch.batch_num, batch.eth_block_num, batch.forger_addr,
 		batch.fees_collected, batch.fee_idxs_coordinator, batch.state_root,
 		batch.num_accounts, batch.last_idx, batch.exit_root, batch.forge_l1_txs_num,
 		batch.slot_num, batch.total_fees_usd FROM batch WHERE batch_num = $1;`,
@@ -181,7 +186,7 @@ func (hdb *HistoryDB) GetBatch(batchNum common.BatchNum) (*common.Batch, error)
 func (hdb *HistoryDB) GetAllBatches() ([]common.Batch, error) {
 	var batches []*common.Batch
 	err := meddler.QueryAll(
-		hdb.db, &batches,
+		hdb.dbRead, &batches,
 		`SELECT batch.batch_num, batch.eth_block_num, batch.forger_addr, batch.fees_collected,
 		 batch.fee_idxs_coordinator, batch.state_root, batch.num_accounts, batch.last_idx, batch.exit_root,
 		 batch.forge_l1_txs_num, batch.slot_num, batch.total_fees_usd FROM batch
@@ -194,7 +199,7 @@ func (hdb *HistoryDB) GetAllBatches() ([]common.Batch, error) {
 func (hdb *HistoryDB) GetBatches(from, to common.BatchNum) ([]common.Batch, error) {
 	var batches []*common.Batch
 	err := meddler.QueryAll(
-		hdb.db, &batches,
+		hdb.dbRead, &batches,
 		`SELECT batch_num, eth_block_num, forger_addr, fees_collected, fee_idxs_coordinator, 
 		state_root, num_accounts, last_idx, exit_root, forge_l1_txs_num, slot_num, total_fees_usd 
 		FROM batch WHERE $1 <= batch_num AND batch_num < $2 ORDER BY batch_num;`,
@@ -206,7 +211,7 @@ func (hdb *HistoryDB) GetBatches(from, to common.BatchNum) ([]common.Batch, erro
 // GetFirstBatchBlockNumBySlot returns the ethereum block number of the first
 // batch within a slot
 func (hdb *HistoryDB) GetFirstBatchBlockNumBySlot(slotNum int64) (int64, error) {
-	row := hdb.db.QueryRow(
+	row := hdb.dbRead.QueryRow(
 		`SELECT eth_block_num FROM batch
 		WHERE slot_num = $1 ORDER BY batch_num ASC LIMIT 1;`, slotNum,
 	)
@@ -216,7 +221,7 @@ func (hdb *HistoryDB) GetFirstBatchBlockNumBySlot(slotNum int64) (int64, error)
 
 // GetLastBatchNum returns the BatchNum of the latest forged batch
 func (hdb *HistoryDB) GetLastBatchNum() (common.BatchNum, error) {
-	row := hdb.db.QueryRow("SELECT batch_num FROM batch ORDER BY batch_num DESC LIMIT 1;")
+	row := hdb.dbRead.QueryRow("SELECT batch_num FROM batch ORDER BY batch_num DESC LIMIT 1;")
 	var batchNum common.BatchNum
 	return batchNum, tracerr.Wrap(row.Scan(&batchNum))
 }
@@ -225,7 +230,7 @@ func (hdb *HistoryDB) GetLastBatchNum() (common.BatchNum, error) {
 func (hdb *HistoryDB) GetLastBatch() (*common.Batch, error) {
 	var batch common.Batch
 	err := meddler.QueryRow(
-		hdb.db, &batch, `SELECT batch.batch_num, batch.eth_block_num, batch.forger_addr,
+		hdb.dbRead, &batch, `SELECT batch.batch_num, batch.eth_block_num, batch.forger_addr,
 		batch.fees_collected, batch.fee_idxs_coordinator, batch.state_root,
 		batch.num_accounts, batch.last_idx, batch.exit_root, batch.forge_l1_txs_num,
 		batch.slot_num, batch.total_fees_usd FROM batch ORDER BY batch_num DESC LIMIT 1;`,
@@ -235,7 +240,7 @@ func (hdb *HistoryDB) GetLastBatch() (*common.Batch, error) {
 
 // GetLastL1BatchBlockNum returns the blockNum of the latest forged l1Batch
 func (hdb *HistoryDB) GetLastL1BatchBlockNum() (int64, error) {
-	row := hdb.db.QueryRow(`SELECT eth_block_num FROM batch
+	row := hdb.dbRead.QueryRow(`SELECT eth_block_num FROM batch
 		WHERE forge_l1_txs_num IS NOT NULL
 		ORDER BY batch_num DESC LIMIT 1;`)
 	var blockNum int64
@@ -245,7 +250,7 @@ func (hdb *HistoryDB) GetLastL1BatchBlockNum() (int64, error) {
 // GetLastL1TxsNum returns the greatest ForgeL1TxsNum in the DB from forged
 // batches.  If there's no batch in the DB (nil, nil) is returned.
 func (hdb *HistoryDB) GetLastL1TxsNum() (*int64, error) {
-	row := hdb.db.QueryRow("SELECT MAX(forge_l1_txs_num) FROM batch;")
+	row := hdb.dbRead.QueryRow("SELECT MAX(forge_l1_txs_num) FROM batch;")
 	lastL1TxsNum := new(int64)
 	return lastL1TxsNum, tracerr.Wrap(row.Scan(&lastL1TxsNum))
 }
@@ -256,15 +261,15 @@ func (hdb *HistoryDB) GetLastL1TxsNum() (*int64, error) {
 func (hdb *HistoryDB) Reorg(lastValidBlock int64) error {
 	var err error
 	if lastValidBlock < 0 {
-		_, err = hdb.db.Exec("DELETE FROM block;")
+		_, err = hdb.dbWrite.Exec("DELETE FROM block;")
 	} else {
-		_, err = hdb.db.Exec("DELETE FROM block WHERE eth_block_num > $1;", lastValidBlock)
+		_, err = hdb.dbWrite.Exec("DELETE FROM block WHERE eth_block_num > $1;", lastValidBlock)
 	}
 	return tracerr.Wrap(err)
 }
 
 // AddBids insert Bids into the DB
-func (hdb *HistoryDB) AddBids(bids []common.Bid) error { return hdb.addBids(hdb.db, bids) }
+func (hdb *HistoryDB) AddBids(bids []common.Bid) error { return hdb.addBids(hdb.dbWrite, bids) }
 func (hdb *HistoryDB) addBids(d meddler.DB, bids []common.Bid) error {
 	if len(bids) == 0 {
 		return nil
@@ -273,7 +278,7 @@ func (hdb *HistoryDB) addBids(d meddler.DB, bids []common.Bid) error {
 	return tracerr.Wrap(db.BulkInsert(
 		d,
 		"INSERT INTO bid (slot_num, bid_value, eth_block_num, bidder_addr) VALUES %s;",
-		bids[:],
+		bids,
 	))
 }
 
@@ -281,7 +286,7 @@ func (hdb *HistoryDB) addBids(d meddler.DB, bids []common.Bid) error {
 func (hdb *HistoryDB) GetAllBids() ([]common.Bid, error) {
 	var bids []*common.Bid
 	err := meddler.QueryAll(
-		hdb.db, &bids,
+		hdb.dbRead, &bids,
 		`SELECT bid.slot_num, bid.bid_value, bid.eth_block_num, bid.bidder_addr FROM bid
 		ORDER BY item_id;`,
 	)
@@ -292,7 +297,7 @@ func (hdb *HistoryDB) GetAllBids() ([]common.Bid, error) {
 func (hdb *HistoryDB) GetBestBidCoordinator(slotNum int64) (*common.BidCoordinator, error) {
 	bidCoord := &common.BidCoordinator{}
 	err := meddler.QueryRow(
-		hdb.db, bidCoord,
+		hdb.dbRead, bidCoord,
 		`SELECT (
 			SELECT default_slot_set_bid
 			FROM auction_vars
@@ -315,7 +320,7 @@ func (hdb *HistoryDB) GetBestBidCoordinator(slotNum int64) (*common.BidCoordinat
 
 // AddCoordinators insert Coordinators into the DB
 func (hdb *HistoryDB) AddCoordinators(coordinators []common.Coordinator) error {
-	return tracerr.Wrap(hdb.addCoordinators(hdb.db, coordinators))
+	return tracerr.Wrap(hdb.addCoordinators(hdb.dbWrite, coordinators))
 }
 func (hdb *HistoryDB) addCoordinators(d meddler.DB, coordinators []common.Coordinator) error {
 	if len(coordinators) == 0 {
@@ -324,13 +329,13 @@ func (hdb *HistoryDB) addCoordinators(d meddler.DB, coordinators []common.Coordi
 	return tracerr.Wrap(db.BulkInsert(
 		d,
 		"INSERT INTO coordinator (bidder_addr, forger_addr, eth_block_num, url) VALUES %s;",
-		coordinators[:],
+		coordinators,
 	))
 }
 
 // AddExitTree insert Exit tree into the DB
 func (hdb *HistoryDB) AddExitTree(exitTree []common.ExitInfo) error {
-	return tracerr.Wrap(hdb.addExitTree(hdb.db, exitTree))
+	return tracerr.Wrap(hdb.addExitTree(hdb.dbWrite, exitTree))
 }
 func (hdb *HistoryDB) addExitTree(d meddler.DB, exitTree []common.ExitInfo) error {
 	if len(exitTree) == 0 {
@@ -340,7 +345,7 @@ func (hdb *HistoryDB) addExitTree(d meddler.DB, exitTree []common.ExitInfo) erro
 		d,
 		"INSERT INTO exit_tree (batch_num, account_idx, merkle_proof, balance, "+
 			"instant_withdrawn, delayed_withdraw_request, delayed_withdrawn) VALUES %s;",
-		exitTree[:],
+		exitTree,
 	))
 }
 
@@ -418,11 +423,13 @@ func (hdb *HistoryDB) updateExitTree(d sqlx.Ext, blockNum int64,
 
 // AddToken insert a token into the DB
 func (hdb *HistoryDB) AddToken(token *common.Token) error {
-	return tracerr.Wrap(meddler.Insert(hdb.db, "token", token))
+	return tracerr.Wrap(meddler.Insert(hdb.dbWrite, "token", token))
 }
 
 // AddTokens insert tokens into the DB
-func (hdb *HistoryDB) AddTokens(tokens []common.Token) error { return hdb.addTokens(hdb.db, tokens) }
+func (hdb *HistoryDB) AddTokens(tokens []common.Token) error {
+	return hdb.addTokens(hdb.dbWrite, tokens)
+}
 func (hdb *HistoryDB) addTokens(d meddler.DB, tokens []common.Token) error {
 	if len(tokens) == 0 {
 		return nil
@@ -443,16 +450,17 @@ func (hdb *HistoryDB) addTokens(d meddler.DB, tokens []common.Token) error {
 			symbol,
 			decimals
 		) VALUES %s;`,
-		tokens[:],
+		tokens,
 	))
 }
 
-// UpdateTokenValue updates the USD value of a token
+// UpdateTokenValue updates the USD value of a token.  Value is the price in
+// USD of a normalized token (1 token = 10^decimals units)
 func (hdb *HistoryDB) UpdateTokenValue(tokenSymbol string, value float64) error {
 	// Sanitize symbol
 	tokenSymbol = strings.ToValidUTF8(tokenSymbol, " ")
 
-	_, err := hdb.db.Exec(
+	_, err := hdb.dbWrite.Exec(
 		"UPDATE token SET usd = $1 WHERE symbol = $2;",
 		value, tokenSymbol,
 	)
@@ -463,7 +471,7 @@ func (hdb *HistoryDB) UpdateTokenValue(tokenSymbol string, value float64) error
 func (hdb *HistoryDB) GetToken(tokenID common.TokenID) (*TokenWithUSD, error) {
 	token := &TokenWithUSD{}
 	err := meddler.QueryRow(
-		hdb.db, token, `SELECT * FROM token WHERE token_id = $1;`, tokenID,
+		hdb.dbRead, token, `SELECT * FROM token WHERE token_id = $1;`, tokenID,
 	)
 	return token, tracerr.Wrap(err)
 }
@@ -472,7 +480,7 @@ func (hdb *HistoryDB) GetToken(tokenID common.TokenID) (*TokenWithUSD, error) {
 func (hdb *HistoryDB) GetAllTokens() ([]TokenWithUSD, error) {
 	var tokens []*TokenWithUSD
 	err := meddler.QueryAll(
-		hdb.db, &tokens,
+		hdb.dbRead, &tokens,
 		"SELECT * FROM token ORDER BY token_id;",
 	)
 	return db.SlicePtrsToSlice(tokens).([]TokenWithUSD), tracerr.Wrap(err)
@@ -481,7 +489,7 @@ func (hdb *HistoryDB) GetAllTokens() ([]TokenWithUSD, error) {
 // GetTokenSymbols returns all the token symbols from the DB
 func (hdb *HistoryDB) GetTokenSymbols() ([]string, error) {
 	var tokenSymbols []string
-	rows, err := hdb.db.Query("SELECT symbol FROM token;")
+	rows, err := hdb.dbRead.Query("SELECT symbol FROM token;")
 	if err != nil {
 		return nil, tracerr.Wrap(err)
 	}
@@ -499,7 +507,7 @@ func (hdb *HistoryDB) GetTokenSymbols() ([]string, error) {
 
 // AddAccounts insert accounts into the DB
 func (hdb *HistoryDB) AddAccounts(accounts []common.Account) error {
-	return tracerr.Wrap(hdb.addAccounts(hdb.db, accounts))
+	return tracerr.Wrap(hdb.addAccounts(hdb.dbWrite, accounts))
 }
 func (hdb *HistoryDB) addAccounts(d meddler.DB, accounts []common.Account) error {
 	if len(accounts) == 0 {
@@ -514,7 +522,7 @@ func (hdb *HistoryDB) addAccounts(d meddler.DB, accounts []common.Account) error
 			bjj,
 			eth_addr
 		) VALUES %s;`,
-		accounts[:],
+		accounts,
 	))
 }
 
@@ -522,18 +530,49 @@ func (hdb *HistoryDB) addAccounts(d meddler.DB, accounts []common.Account) error
 func (hdb *HistoryDB) GetAllAccounts() ([]common.Account, error) {
 	var accs []*common.Account
 	err := meddler.QueryAll(
-		hdb.db, &accs,
+		hdb.dbRead, &accs,
 		"SELECT idx, token_id, batch_num, bjj, eth_addr FROM account ORDER BY idx;",
 	)
 	return db.SlicePtrsToSlice(accs).([]common.Account), tracerr.Wrap(err)
 }
 
+// AddAccountUpdates inserts accUpdates into the DB
+func (hdb *HistoryDB) AddAccountUpdates(accUpdates []common.AccountUpdate) error {
+	return tracerr.Wrap(hdb.addAccountUpdates(hdb.dbWrite, accUpdates))
+}
+func (hdb *HistoryDB) addAccountUpdates(d meddler.DB, accUpdates []common.AccountUpdate) error {
+	if len(accUpdates) == 0 {
+		return nil
+	}
+	return tracerr.Wrap(db.BulkInsert(
+		d,
+		`INSERT INTO account_update (
+			eth_block_num,
+			batch_num,
+			idx,
+			nonce,
+			balance
+		) VALUES %s;`,
+		accUpdates,
+	))
+}
+
+// GetAllAccountUpdates returns all the AccountUpdate from the DB
+func (hdb *HistoryDB) GetAllAccountUpdates() ([]common.AccountUpdate, error) {
+	var accUpdates []*common.AccountUpdate
+	err := meddler.QueryAll(
+		hdb.dbRead, &accUpdates,
+		"SELECT eth_block_num, batch_num, idx, nonce, balance FROM account_update ORDER BY idx;",
+	)
+	return db.SlicePtrsToSlice(accUpdates).([]common.AccountUpdate), tracerr.Wrap(err)
+}
+
 // AddL1Txs inserts L1 txs to the DB. USD and DepositAmountUSD will be set automatically before storing the tx.
 // If the tx is originated by a coordinator, BatchNum must be provided. If it's originated by a user,
 // BatchNum should be null, and the value will be setted by a trigger when a batch forges the tx.
 // EffectiveAmount and EffectiveDepositAmount are seted with default values by the DB.
 func (hdb *HistoryDB) AddL1Txs(l1txs []common.L1Tx) error {
-	return tracerr.Wrap(hdb.addL1Txs(hdb.db, l1txs))
+	return tracerr.Wrap(hdb.addL1Txs(hdb.dbWrite, l1txs))
 }
 
 // addL1Txs inserts L1 txs to the DB. USD and DepositAmountUSD will be set automatically before storing the tx.
@@ -587,7 +626,7 @@ func (hdb *HistoryDB) addL1Txs(d meddler.DB, l1txs []common.L1Tx) error {
 
 // AddL2Txs inserts L2 txs to the DB. TokenID, USD and FeeUSD will be set automatically before storing the tx.
 func (hdb *HistoryDB) AddL2Txs(l2txs []common.L2Tx) error {
-	return tracerr.Wrap(hdb.addL2Txs(hdb.db, l2txs))
+	return tracerr.Wrap(hdb.addL2Txs(hdb.dbWrite, l2txs))
 }
 
 // addL2Txs inserts L2 txs to the DB. TokenID, USD and FeeUSD will be set automatically before storing the tx.
@@ -646,7 +685,7 @@ func (hdb *HistoryDB) addTxs(d meddler.DB, txs []txWrite) error {
 			fee,
 			nonce
 		) VALUES %s;`,
-		txs[:],
+		txs,
 	))
 }
 
@@ -654,7 +693,7 @@ func (hdb *HistoryDB) addTxs(d meddler.DB, txs []txWrite) error {
 func (hdb *HistoryDB) GetAllExits() ([]common.ExitInfo, error) {
 	var exits []*common.ExitInfo
 	err := meddler.QueryAll(
-		hdb.db, &exits,
+		hdb.dbRead, &exits,
 		`SELECT exit_tree.batch_num, exit_tree.account_idx, exit_tree.merkle_proof,
 		exit_tree.balance, exit_tree.instant_withdrawn, exit_tree.delayed_withdraw_request,
 		exit_tree.delayed_withdrawn FROM exit_tree ORDER BY item_id;`,
@@ -666,7 +705,7 @@ func (hdb *HistoryDB) GetAllExits() ([]common.ExitInfo, error) {
 func (hdb *HistoryDB) GetAllL1UserTxs() ([]common.L1Tx, error) {
 	var txs []*common.L1Tx
 	err := meddler.QueryAll(
-		hdb.db, &txs, // Note that '\x' gets parsed as a big.Int with value = 0
+		hdb.dbRead, &txs, // Note that '\x' gets parsed as a big.Int with value = 0
 		`SELECT tx.id, tx.to_forge_l1_txs_num, tx.position, tx.user_origin,
 		tx.from_idx, tx.effective_from_idx, tx.from_eth_addr, tx.from_bjj, tx.to_idx, tx.token_id,
 		tx.amount, (CASE WHEN tx.batch_num IS NULL THEN NULL WHEN tx.amount_success THEN tx.amount ELSE '\x' END) AS effective_amount,
@@ -683,7 +722,7 @@ func (hdb *HistoryDB) GetAllL1CoordinatorTxs() ([]common.L1Tx, error) {
 	// Since the query specifies that only coordinator txs are returned, it's safe to assume
 	// that returned txs will always have effective amounts
 	err := meddler.QueryAll(
-		hdb.db, &txs,
+		hdb.dbRead, &txs,
 		`SELECT tx.id, tx.to_forge_l1_txs_num, tx.position, tx.user_origin,
 		tx.from_idx, tx.effective_from_idx, tx.from_eth_addr, tx.from_bjj, tx.to_idx, tx.token_id,
 		tx.amount, tx.amount AS effective_amount,
@@ -698,7 +737,7 @@ func (hdb *HistoryDB) GetAllL1CoordinatorTxs() ([]common.L1Tx, error) {
 func (hdb *HistoryDB) GetAllL2Txs() ([]common.L2Tx, error) {
 	var txs []*common.L2Tx
 	err := meddler.QueryAll(
-		hdb.db, &txs,
+		hdb.dbRead, &txs,
 		`SELECT tx.id, tx.batch_num, tx.position,
 		tx.from_idx, tx.to_idx, tx.amount, tx.token_id,
 		tx.fee, tx.nonce, tx.type, tx.eth_block_num
@@ -711,7 +750,7 @@ func (hdb *HistoryDB) GetAllL2Txs() ([]common.L2Tx, error) {
 func (hdb *HistoryDB) GetUnforgedL1UserTxs(toForgeL1TxsNum int64) ([]common.L1Tx, error) {
 	var txs []*common.L1Tx
 	err := meddler.QueryAll(
-		hdb.db, &txs, // only L1 user txs can have batch_num set to null
+		hdb.dbRead, &txs, // only L1 user txs can have batch_num set to null
 		`SELECT tx.id, tx.to_forge_l1_txs_num, tx.position, tx.user_origin,
 		tx.from_idx, tx.from_eth_addr, tx.from_bjj, tx.to_idx, tx.token_id,
 		tx.amount, NULL AS effective_amount,
@@ -728,7 +767,7 @@ func (hdb *HistoryDB) GetUnforgedL1UserTxs(toForgeL1TxsNum int64) ([]common.L1Tx
 
 // GetLastTxsPosition for a given to_forge_l1_txs_num
 func (hdb *HistoryDB) GetLastTxsPosition(toForgeL1TxsNum int64) (int, error) {
-	row := hdb.db.QueryRow(
+	row := hdb.dbRead.QueryRow(
 		"SELECT position FROM tx WHERE to_forge_l1_txs_num = $1 ORDER BY position DESC;",
 		toForgeL1TxsNum,
 	)
@@ -742,15 +781,15 @@ func (hdb *HistoryDB) GetSCVars() (*common.RollupVariables, *common.AuctionVaria
 	var rollup common.RollupVariables
 	var auction common.AuctionVariables
 	var wDelayer common.WDelayerVariables
-	if err := meddler.QueryRow(hdb.db, &rollup,
+	if err := meddler.QueryRow(hdb.dbRead, &rollup,
 		"SELECT * FROM rollup_vars ORDER BY eth_block_num DESC LIMIT 1;"); err != nil {
 		return nil, nil, nil, tracerr.Wrap(err)
 	}
-	if err := meddler.QueryRow(hdb.db, &auction,
+	if err := meddler.QueryRow(hdb.dbRead, &auction,
 		"SELECT * FROM auction_vars ORDER BY eth_block_num DESC LIMIT 1;"); err != nil {
 		return nil, nil, nil, tracerr.Wrap(err)
 	}
-	if err := meddler.QueryRow(hdb.db, &wDelayer,
+	if err := meddler.QueryRow(hdb.dbRead, &wDelayer,
 		"SELECT * FROM wdelayer_vars ORDER BY eth_block_num DESC LIMIT 1;"); err != nil {
 		return nil, nil, nil, tracerr.Wrap(err)
 	}
@@ -781,7 +820,7 @@ func (hdb *HistoryDB) addBucketUpdates(d meddler.DB, bucketUpdates []common.Buck
 		 	block_stamp,
 		 	withdrawals
 		) VALUES %s;`,
-		bucketUpdates[:],
+		bucketUpdates,
 	))
 }
 
@@ -795,7 +834,7 @@ func (hdb *HistoryDB) AddBucketUpdatesTest(d meddler.DB, bucketUpdates []common.
 func (hdb *HistoryDB) GetAllBucketUpdates() ([]common.BucketUpdate, error) {
 	var bucketUpdates []*common.BucketUpdate
 	err := meddler.QueryAll(
-		hdb.db, &bucketUpdates,
+		hdb.dbRead, &bucketUpdates,
 		`SELECT eth_block_num, num_bucket, block_stamp, withdrawals  
 		FROM bucket_update ORDER BY item_id;`,
 	)
@@ -813,7 +852,7 @@ func (hdb *HistoryDB) addTokenExchanges(d meddler.DB, tokenExchanges []common.To
     			eth_addr,
     			value_usd
 		) VALUES %s;`,
-		tokenExchanges[:],
+		tokenExchanges,
 	))
 }
 
@@ -821,7 +860,7 @@ func (hdb *HistoryDB) addTokenExchanges(d meddler.DB, tokenExchanges []common.To
 func (hdb *HistoryDB) GetAllTokenExchanges() ([]common.TokenExchange, error) {
 	var tokenExchanges []*common.TokenExchange
 	err := meddler.QueryAll(
-		hdb.db, &tokenExchanges,
+		hdb.dbRead, &tokenExchanges,
 		"SELECT eth_block_num, eth_addr, value_usd FROM token_exchange ORDER BY item_id;",
 	)
 	return db.SlicePtrsToSlice(tokenExchanges).([]common.TokenExchange), tracerr.Wrap(err)
@@ -841,7 +880,7 @@ func (hdb *HistoryDB) addEscapeHatchWithdrawals(d meddler.DB,
 			token_addr,
 			amount
 		) VALUES %s;`,
-		escapeHatchWithdrawals[:],
+		escapeHatchWithdrawals,
 	))
 }
 
@@ -849,7 +888,7 @@ func (hdb *HistoryDB) addEscapeHatchWithdrawals(d meddler.DB,
 func (hdb *HistoryDB) GetAllEscapeHatchWithdrawals() ([]common.WDelayerEscapeHatchWithdrawal, error) {
 	var escapeHatchWithdrawals []*common.WDelayerEscapeHatchWithdrawal
 	err := meddler.QueryAll(
-		hdb.db, &escapeHatchWithdrawals,
+		hdb.dbRead, &escapeHatchWithdrawals,
 		"SELECT eth_block_num, who_addr, to_addr, token_addr, amount FROM escape_hatch_withdrawal ORDER BY item_id;",
 	)
 	return db.SlicePtrsToSlice(escapeHatchWithdrawals).([]common.WDelayerEscapeHatchWithdrawal),
@@ -862,7 +901,7 @@ func (hdb *HistoryDB) GetAllEscapeHatchWithdrawals() ([]common.WDelayerEscapeHat
 // exist in the smart contracts.
 func (hdb *HistoryDB) SetInitialSCVars(rollup *common.RollupVariables,
 	auction *common.AuctionVariables, wDelayer *common.WDelayerVariables) error {
-	txn, err := hdb.db.Beginx()
+	txn, err := hdb.dbWrite.Beginx()
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
@@ -946,7 +985,7 @@ func (hdb *HistoryDB) setExtraInfoForgedL1UserTxs(d sqlx.Ext, txs []common.L1Tx)
 // the pagination system of the API/DB depends on this.  Within blocks, all
 // items should also be in the correct order (Accounts, Tokens, Txs, etc.)
 func (hdb *HistoryDB) AddBlockSCData(blockData *common.BlockData) (err error) {
-	txn, err := hdb.db.Beginx()
+	txn, err := hdb.dbWrite.Beginx()
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
@@ -1018,6 +1057,11 @@ func (hdb *HistoryDB) AddBlockSCData(blockData *common.BlockData) (err error) {
 			return tracerr.Wrap(err)
 		}
 
+		// Add accountBalances if it exists
+		if err := hdb.addAccountUpdates(txn, batch.UpdatedAccounts); err != nil {
+			return tracerr.Wrap(err)
+		}
+
 		// Set the EffectiveAmount and EffectiveDepositAmount of all the
 		// L1UserTxs that have been forged in this batch
 		if err = hdb.setExtraInfoForgedL1UserTxs(txn, batch.L1UserTxs); err != nil {
@@ -1099,7 +1143,7 @@ func (hdb *HistoryDB) AddBlockSCData(blockData *common.BlockData) (err error) {
 func (hdb *HistoryDB) GetCoordinatorAPI(bidderAddr ethCommon.Address) (*CoordinatorAPI, error) {
 	coordinator := &CoordinatorAPI{}
 	err := meddler.QueryRow(
-		hdb.db, coordinator,
+		hdb.dbRead, coordinator,
 		"SELECT * FROM coordinator WHERE bidder_addr = $1 ORDER BY item_id DESC LIMIT 1;",
 		bidderAddr,
 	)
@@ -1108,14 +1152,14 @@ func (hdb *HistoryDB) GetCoordinatorAPI(bidderAddr ethCommon.Address) (*Coordina
 
 // AddAuctionVars insert auction vars into the DB
 func (hdb *HistoryDB) AddAuctionVars(auctionVars *common.AuctionVariables) error {
-	return tracerr.Wrap(meddler.Insert(hdb.db, "auction_vars", auctionVars))
+	return tracerr.Wrap(meddler.Insert(hdb.dbWrite, "auction_vars", auctionVars))
 }
 
 // GetTokensTest used to get tokens in a testing context
 func (hdb *HistoryDB) GetTokensTest() ([]TokenWithUSD, error) {
 	tokens := []*TokenWithUSD{}
 	if err := meddler.QueryAll(
-		hdb.db, &tokens,
+		hdb.dbRead, &tokens,
 		"SELECT * FROM TOKEN",
 	); err != nil {
 		return nil, tracerr.Wrap(err)

db/historydb/historydb_test.go

@@ -39,12 +39,12 @@ func TestMain(m *testing.M) {
 	if err != nil {
 		panic(err)
 	}
-	historyDB = NewHistoryDB(db, nil)
+	historyDB = NewHistoryDB(db, db, nil)
 	if err != nil {
 		panic(err)
 	}
 	apiConnCon := dbUtils.NewAPICnnectionController(1, time.Second)
-	historyDBWithACC = NewHistoryDB(db, apiConnCon)
+	historyDBWithACC = NewHistoryDB(db, db, apiConnCon)
 	// Run tests
 	result := m.Run()
 	// Close DB
@@ -377,6 +377,22 @@ func TestAccounts(t *testing.T) {
 		accs[i].Balance = nil
 		assert.Equal(t, accs[i], acc)
 	}
+	// Test AccountBalances
+	accUpdates := make([]common.AccountUpdate, len(accs))
+	for i, acc := range accs {
+		accUpdates[i] = common.AccountUpdate{
+			EthBlockNum: batches[acc.BatchNum-1].EthBlockNum,
+			BatchNum:    acc.BatchNum,
+			Idx:         acc.Idx,
+			Nonce:       common.Nonce(i),
+			Balance:     big.NewInt(int64(i)),
+		}
+	}
+	err = historyDB.AddAccountUpdates(accUpdates)
+	require.NoError(t, err)
+	fetchedAccBalances, err := historyDB.GetAllAccountUpdates()
+	require.NoError(t, err)
+	assert.Equal(t, accUpdates, fetchedAccBalances)
 }
 
 func TestTxs(t *testing.T) {
@@ -801,11 +817,11 @@ func TestSetExtraInfoForgedL1UserTxs(t *testing.T) {
 	}
 	// Add second batch to trigger the update of the batch_num,
 	// while avoiding the implicit call of setExtraInfoForgedL1UserTxs
-	err = historyDB.addBlock(historyDB.db, &blocks[1].Block)
+	err = historyDB.addBlock(historyDB.dbWrite, &blocks[1].Block)
 	require.NoError(t, err)
-	err = historyDB.addBatch(historyDB.db, &blocks[1].Rollup.Batches[0].Batch)
+	err = historyDB.addBatch(historyDB.dbWrite, &blocks[1].Rollup.Batches[0].Batch)
 	require.NoError(t, err)
-	err = historyDB.addAccounts(historyDB.db, blocks[1].Rollup.Batches[0].CreatedAccounts)
+	err = historyDB.addAccounts(historyDB.dbWrite, blocks[1].Rollup.Batches[0].CreatedAccounts)
 	require.NoError(t, err)
 
 	// Set the Effective{Amount,DepositAmount} of the L1UserTxs that are forged in the second block
@@ -815,7 +831,7 @@ func TestSetExtraInfoForgedL1UserTxs(t *testing.T) {
 	l1Txs[1].EffectiveAmount = big.NewInt(0)
 	l1Txs[2].EffectiveDepositAmount = big.NewInt(0)
 	l1Txs[2].EffectiveAmount = big.NewInt(0)
-	err = historyDB.setExtraInfoForgedL1UserTxs(historyDB.db, l1Txs)
+	err = historyDB.setExtraInfoForgedL1UserTxs(historyDB.dbWrite, l1Txs)
 	require.NoError(t, err)
 
 	dbL1Txs, err := historyDB.GetAllL1UserTxs()
@@ -902,10 +918,10 @@ func TestUpdateExitTree(t *testing.T) {
 		common.WithdrawInfo{Idx: 259, NumExitRoot: 3, InstantWithdraw: false,
 			Owner: tc.UsersByIdx[259].Addr, Token: tokenAddr},
 	)
-	err = historyDB.addBlock(historyDB.db, &block.Block)
+	err = historyDB.addBlock(historyDB.dbWrite, &block.Block)
 	require.NoError(t, err)
 
-	err = historyDB.updateExitTree(historyDB.db, block.Block.Num,
+	err = historyDB.updateExitTree(historyDB.dbWrite, block.Block.Num,
 		block.Rollup.Withdrawals, block.WDelayer.Withdrawals)
 	require.NoError(t, err)
 
@@ -935,10 +951,10 @@ func TestUpdateExitTree(t *testing.T) {
 			Token:  tokenAddr,
 			Amount: big.NewInt(80),
 		})
-	err = historyDB.addBlock(historyDB.db, &block.Block)
+	err = historyDB.addBlock(historyDB.dbWrite, &block.Block)
 	require.NoError(t, err)
 
-	err = historyDB.updateExitTree(historyDB.db, block.Block.Num,
+	err = historyDB.updateExitTree(historyDB.dbWrite, block.Block.Num,
 		block.Rollup.Withdrawals, block.WDelayer.Withdrawals)
 	require.NoError(t, err)
 
@@ -981,7 +997,7 @@ func TestGetBestBidCoordinator(t *testing.T) {
 			URL:         "bar",
 		},
 	}
-	err = historyDB.addCoordinators(historyDB.db, coords)
+	err = historyDB.addCoordinators(historyDB.dbWrite, coords)
 	require.NoError(t, err)
 
 	bids := []common.Bid{
@@ -999,7 +1015,7 @@ func TestGetBestBidCoordinator(t *testing.T) {
 		},
 	}
 
-	err = historyDB.addBids(historyDB.db, bids)
+	err = historyDB.addBids(historyDB.dbWrite, bids)
 	require.NoError(t, err)
 
 	forger10, err := historyDB.GetBestBidCoordinator(10)
@@ -1037,7 +1053,7 @@ func TestAddBucketUpdates(t *testing.T) {
 			Withdrawals: big.NewInt(42),
 		},
 	}
-	err := historyDB.addBucketUpdates(historyDB.db, bucketUpdates)
+	err := historyDB.addBucketUpdates(historyDB.dbWrite, bucketUpdates)
 	require.NoError(t, err)
 	dbBucketUpdates, err := historyDB.GetAllBucketUpdates()
 	require.NoError(t, err)
@@ -1062,7 +1078,7 @@ func TestAddTokenExchanges(t *testing.T) {
 			ValueUSD:    67890,
 		},
 	}
-	err := historyDB.addTokenExchanges(historyDB.db, tokenExchanges)
+	err := historyDB.addTokenExchanges(historyDB.dbWrite, tokenExchanges)
 	require.NoError(t, err)
 	dbTokenExchanges, err := historyDB.GetAllTokenExchanges()
 	require.NoError(t, err)
@@ -1091,7 +1107,7 @@ func TestAddEscapeHatchWithdrawals(t *testing.T) {
 			Amount:      big.NewInt(20003),
 		},
 	}
-	err := historyDB.addEscapeHatchWithdrawals(historyDB.db, escapeHatchWithdrawals)
+	err := historyDB.addEscapeHatchWithdrawals(historyDB.dbWrite, escapeHatchWithdrawals)
 	require.NoError(t, err)
 	dbEscapeHatchWithdrawals, err := historyDB.GetAllEscapeHatchWithdrawals()
 	require.NoError(t, err)
@@ -1159,16 +1175,12 @@ func TestGetMetricsAPI(t *testing.T) {
 	res, err := historyDBWithACC.GetMetricsAPI(common.BatchNum(numBatches))
 	assert.NoError(t, err)
 
-	assert.Equal(t, float64(numTx)/float64(numBatches-1), res.TransactionsPerBatch)
+	assert.Equal(t, float64(numTx)/float64(numBatches), res.TransactionsPerBatch)
 
 	// Frequency is not exactly the desired one, some decimals may appear
-	assert.GreaterOrEqual(t, res.BatchFrequency, float64(frequency))
-	assert.Less(t, res.BatchFrequency, float64(frequency+1))
-	// Truncate frecuency into an int to do an exact check
-	assert.Equal(t, frequency, int(res.BatchFrequency))
-	// This may also be different in some decimals
-	// Truncate it to the third decimal to compare
-	assert.Equal(t, math.Trunc((float64(numTx)/float64(frequency*blockNum-frequency))/0.001)*0.001, math.Trunc(res.TransactionsPerSecond/0.001)*0.001)
+	// There is a -2 as time for first and last batch is not taken into account
+	assert.InEpsilon(t, float64(frequency)*float64(numBatches-2)/float64(numBatches), res.BatchFrequency, 0.01)
+	assert.InEpsilon(t, float64(numTx)/float64(frequency*blockNum-frequency), res.TransactionsPerSecond, 0.01)
 	assert.Equal(t, int64(3), res.TotalAccounts)
 	assert.Equal(t, int64(3), res.TotalBJJs)
 	// Til does not set fees
@@ -1195,7 +1207,8 @@ func TestGetMetricsAPIMoreThan24Hours(t *testing.T) {
 	set = append(set, til.Instruction{Typ: til.TypeNewBlock})
 
 	// Transfers
-	for x := 0; x < 6000; x++ {
+	const numBlocks int = 30
+	for x := 0; x < numBlocks; x++ {
 		set = append(set, til.Instruction{
 			Typ:           common.TxTypeTransfer,
 			TokenID:       common.TokenID(0),
@@ -1219,19 +1232,20 @@ func TestGetMetricsAPIMoreThan24Hours(t *testing.T) {
 	err = tc.FillBlocksExtra(blocks, &tilCfgExtra)
 	require.NoError(t, err)
 
-	const numBatches int = 6002
-	const numTx int = 6003
-	const blockNum = 6005 - 1
+	const numBatches int = 2 + numBlocks
+	const blockNum = 4 + numBlocks
 
 	// Sanity check
 	require.Equal(t, blockNum, len(blocks))
 
 	// Adding one batch per block
 	// batch frequency can be chosen
-	const frequency int = 15
+	const blockTime time.Duration = 3600 * time.Second
+	now := time.Now()
+	require.NoError(t, err)
 
 	for i := range blocks {
-		blocks[i].Block.Timestamp = time.Now().Add(-time.Second * time.Duration(frequency*(len(blocks)-i)))
+		blocks[i].Block.Timestamp = now.Add(-time.Duration(len(blocks)-1-i) * blockTime)
 		err = historyDB.AddBlockSCData(&blocks[i])
 		assert.NoError(t, err)
 	}
@@ -1239,16 +1253,10 @@ func TestGetMetricsAPIMoreThan24Hours(t *testing.T) {
 	res, err := historyDBWithACC.GetMetricsAPI(common.BatchNum(numBatches))
 	assert.NoError(t, err)
 
-	assert.Equal(t, math.Trunc((float64(numTx)/float64(numBatches-1))/0.001)*0.001, math.Trunc(res.TransactionsPerBatch/0.001)*0.001)
+	assert.InEpsilon(t, 1.0, res.TransactionsPerBatch, 0.1)
 
-	// Frequency is not exactly the desired one, some decimals may appear
-	assert.GreaterOrEqual(t, res.BatchFrequency, float64(frequency))
-	assert.Less(t, res.BatchFrequency, float64(frequency+1))
-	// Truncate frecuency into an int to do an exact check
-	assert.Equal(t, frequency, int(res.BatchFrequency))
-	// This may also be different in some decimals
-	// Truncate it to the third decimal to compare
-	assert.Equal(t, math.Trunc((float64(numTx)/float64(frequency*blockNum-frequency))/0.001)*0.001, math.Trunc(res.TransactionsPerSecond/0.001)*0.001)
+	assert.InEpsilon(t, res.BatchFrequency, float64(blockTime/time.Second), 0.1)
+	assert.InEpsilon(t, 1.0/float64(blockTime/time.Second), res.TransactionsPerSecond, 0.1)
 	assert.Equal(t, int64(3), res.TotalAccounts)
 	assert.Equal(t, int64(3), res.TotalBJJs)
 	// Til does not set fees

db/historydb/views.go

@@ -239,8 +239,8 @@ type AccountAPI struct {
 	BatchNum         common.BatchNum     `meddler:"batch_num"`
 	PublicKey        apitypes.HezBJJ     `meddler:"bjj"`
 	EthAddr          apitypes.HezEthAddr `meddler:"eth_addr"`
-	Nonce            common.Nonce        `meddler:"-"` // max of 40 bits used
-	Balance          *apitypes.BigIntStr `meddler:"-"` // max of 192 bits used
+	Nonce            common.Nonce        `meddler:"nonce"`   // max of 40 bits used
+	Balance          *apitypes.BigIntStr `meddler:"balance"` // max of 192 bits used
 	TotalItems       uint64              `meddler:"total_items"`
 	FirstItem        uint64              `meddler:"first_item"`
 	LastItem         uint64              `meddler:"last_item"`

db/l2db/apiqueries.go

@@ -1,12 +1,18 @@
 package l2db
 
 import (
+	"fmt"
+
 	ethCommon "github.com/ethereum/go-ethereum/common"
 	"github.com/hermeznetwork/hermez-node/common"
 	"github.com/hermeznetwork/tracerr"
 	"github.com/russross/meddler"
 )
 
+var (
+	errPoolFull = fmt.Errorf("the pool is at full capacity. More transactions are not accepted currently")
+)
+
 // AddAccountCreationAuthAPI inserts an account creation authorization into the DB
 func (l2db *L2DB) AddAccountCreationAuthAPI(auth *common.AccountCreationAuth) error {
 	cancel, err := l2db.apiConnCon.Acquire()
@@ -28,7 +34,7 @@ func (l2db *L2DB) GetAccountCreationAuthAPI(addr ethCommon.Address) (*AccountCre
 	defer l2db.apiConnCon.Release()
 	auth := new(AccountCreationAuthAPI)
 	return auth, tracerr.Wrap(meddler.QueryRow(
-		l2db.db, auth,
+		l2db.dbRead, auth,
 		"SELECT * FROM account_creation_auth WHERE eth_addr = $1;",
 		addr,
 	))
@@ -42,20 +48,54 @@ func (l2db *L2DB) AddTxAPI(tx *PoolL2TxWrite) error {
 		return tracerr.Wrap(err)
 	}
 	defer l2db.apiConnCon.Release()
-	row := l2db.db.QueryRow(
-		"SELECT COUNT(*) FROM tx_pool WHERE state = $1;",
-		common.PoolL2TxStatePending,
-	)
-	var totalTxs uint32
-	if err := row.Scan(&totalTxs); err != nil {
+
+	row := l2db.dbRead.QueryRow(`SELECT
+		($1::NUMERIC * token.usd * fee_percentage($2::NUMERIC)) /
+			(10.0 ^ token.decimals::NUMERIC)
+		FROM token WHERE token.token_id = $3;`,
+		tx.AmountFloat, tx.Fee, tx.TokenID)
+	var feeUSD float64
+	if err := row.Scan(&feeUSD); err != nil {
 		return tracerr.Wrap(err)
 	}
-	if totalTxs >= l2db.maxTxs {
-		return tracerr.New(
-			"The pool is at full capacity. More transactions are not accepted currently",
-		)
+	if feeUSD < l2db.minFeeUSD {
+		return tracerr.Wrap(fmt.Errorf("tx.feeUSD (%v) < minFeeUSD (%v)",
+			feeUSD, l2db.minFeeUSD))
 	}
-	return tracerr.Wrap(meddler.Insert(l2db.db, "tx_pool", tx))
+
+	// Prepare insert SQL query argument parameters
+	namesPart, err := meddler.Default.ColumnsQuoted(tx, false)
+	if err != nil {
+		return err
+	}
+	valuesPart, err := meddler.Default.PlaceholdersString(tx, false)
+	if err != nil {
+		return err
+	}
+	values, err := meddler.Default.Values(tx, false)
+	if err != nil {
+		return err
+	}
+
+	q := fmt.Sprintf(
+		`INSERT INTO tx_pool (%s)
+		SELECT %s
+		WHERE (SELECT COUNT(*) FROM tx_pool WHERE state = $%v) < $%v;`,
+		namesPart, valuesPart,
+		len(values)+1, len(values)+2) //nolint:gomnd
+	values = append(values, common.PoolL2TxStatePending, l2db.maxTxs)
+	res, err := l2db.dbWrite.Exec(q, values...)
+	if err != nil {
+		return tracerr.Wrap(err)
+	}
+	rowsAffected, err := res.RowsAffected()
+	if err != nil {
+		return tracerr.Wrap(err)
+	}
+	if rowsAffected == 0 {
+		return tracerr.Wrap(errPoolFull)
+	}
+	return nil
 }
 
 // selectPoolTxAPI select part of queries to get PoolL2TxRead
@@ -78,7 +118,7 @@ func (l2db *L2DB) GetTxAPI(txID common.TxID) (*PoolTxAPI, error) {
 	defer l2db.apiConnCon.Release()
 	tx := new(PoolTxAPI)
 	return tx, tracerr.Wrap(meddler.QueryRow(
-		l2db.db, tx,
+		l2db.dbRead, tx,
 		selectPoolTxAPI+"WHERE tx_id = $1;",
 		txID,
 	))

db/l2db/l2db.go

@@ -21,10 +21,12 @@ import (
 // L2DB stores L2 txs and authorization registers received by the coordinator and keeps them until they are no longer relevant
 // due to them being forged or invalid after a safety period
 type L2DB struct {
-	db           *sqlx.DB
+	dbRead       *sqlx.DB
+	dbWrite      *sqlx.DB
 	safetyPeriod common.BatchNum
 	ttl          time.Duration
 	maxTxs       uint32 // limit of txs that are accepted in the pool
+	minFeeUSD    float64
 	apiConnCon   *db.APIConnectionController
 }
 
@@ -32,17 +34,20 @@ type L2DB struct {
 // To create it, it's needed db connection, safety period expressed in batches,
 // maxTxs that the DB should have and TTL (time to live) for pending txs.
 func NewL2DB(
-	db *sqlx.DB,
+	dbRead, dbWrite *sqlx.DB,
 	safetyPeriod common.BatchNum,
 	maxTxs uint32,
+	minFeeUSD float64,
 	TTL time.Duration,
 	apiConnCon *db.APIConnectionController,
 ) *L2DB {
 	return &L2DB{
-		db:           db,
+		dbRead:       dbRead,
+		dbWrite:      dbWrite,
 		safetyPeriod: safetyPeriod,
 		ttl:          TTL,
 		maxTxs:       maxTxs,
+		minFeeUSD:    minFeeUSD,
 		apiConnCon:   apiConnCon,
 	}
 }
@@ -50,12 +55,18 @@ func NewL2DB(
 // DB returns a pointer to the L2DB.db. This method should be used only for
 // internal testing purposes.
 func (l2db *L2DB) DB() *sqlx.DB {
-	return l2db.db
+	return l2db.dbWrite
+}
+
+// MinFeeUSD returns the minimum fee in USD that is required to accept txs into
+// the pool
+func (l2db *L2DB) MinFeeUSD() float64 {
+	return l2db.minFeeUSD
 }
 
 // AddAccountCreationAuth inserts an account creation authorization into the DB
 func (l2db *L2DB) AddAccountCreationAuth(auth *common.AccountCreationAuth) error {
-	_, err := l2db.db.Exec(
+	_, err := l2db.dbWrite.Exec(
 		`INSERT INTO account_creation_auth (eth_addr, bjj, signature)
 		VALUES ($1, $2, $3);`,
 		auth.EthAddr, auth.BJJ, auth.Signature,
@@ -67,30 +78,12 @@ func (l2db *L2DB) AddAccountCreationAuth(auth *common.AccountCreationAuth) error
 func (l2db *L2DB) GetAccountCreationAuth(addr ethCommon.Address) (*common.AccountCreationAuth, error) {
 	auth := new(common.AccountCreationAuth)
 	return auth, tracerr.Wrap(meddler.QueryRow(
-		l2db.db, auth,
+		l2db.dbRead, auth,
 		"SELECT * FROM account_creation_auth WHERE eth_addr = $1;",
 		addr,
 	))
 }
 
-// AddTx inserts a tx to the pool
-func (l2db *L2DB) AddTx(tx *PoolL2TxWrite) error {
-	row := l2db.db.QueryRow(
-		"SELECT COUNT(*) FROM tx_pool WHERE state = $1;",
-		common.PoolL2TxStatePending,
-	)
-	var totalTxs uint32
-	if err := row.Scan(&totalTxs); err != nil {
-		return tracerr.Wrap(err)
-	}
-	if totalTxs >= l2db.maxTxs {
-		return tracerr.New(
-			"The pool is at full capacity. More transactions are not accepted currently",
-		)
-	}
-	return tracerr.Wrap(meddler.Insert(l2db.db, "tx_pool", tx))
-}
-
 // UpdateTxsInfo updates the parameter Info of the pool transactions
 func (l2db *L2DB) UpdateTxsInfo(txs []common.PoolL2Tx) error {
 	if len(txs) == 0 {
@@ -114,7 +107,7 @@ func (l2db *L2DB) UpdateTxsInfo(txs []common.PoolL2Tx) error {
 		WHERE tx_pool.tx_id = tx_update.id;
 	`
 	if len(txUpdates) > 0 {
-		if _, err := sqlx.NamedExec(l2db.db, query, txUpdates); err != nil {
+		if _, err := sqlx.NamedExec(l2db.dbWrite, query, txUpdates); err != nil {
 			return tracerr.Wrap(err)
 		}
 	}
@@ -122,9 +115,8 @@ func (l2db *L2DB) UpdateTxsInfo(txs []common.PoolL2Tx) error {
 	return nil
 }
 
-// AddTxTest inserts a tx into the L2DB. This is useful for test purposes,
-// but in production txs will only be inserted through the API
-func (l2db *L2DB) AddTxTest(tx *common.PoolL2Tx) error {
+// NewPoolL2TxWriteFromPoolL2Tx creates a new PoolL2TxWrite from a PoolL2Tx
+func NewPoolL2TxWriteFromPoolL2Tx(tx *common.PoolL2Tx) *PoolL2TxWrite {
 	// transform tx from *common.PoolL2Tx to PoolL2TxWrite
 	insertTx := &PoolL2TxWrite{
 		TxID:      tx.TxID,
@@ -166,8 +158,15 @@ func (l2db *L2DB) AddTxTest(tx *common.PoolL2Tx) error {
 	f := new(big.Float).SetInt(tx.Amount)
 	amountF, _ := f.Float64()
 	insertTx.AmountFloat = amountF
+	return insertTx
+}
+
+// AddTxTest inserts a tx into the L2DB. This is useful for test purposes,
+// but in production txs will only be inserted through the API
+func (l2db *L2DB) AddTxTest(tx *common.PoolL2Tx) error {
+	insertTx := NewPoolL2TxWriteFromPoolL2Tx(tx)
 	// insert tx
-	return tracerr.Wrap(meddler.Insert(l2db.db, "tx_pool", insertTx))
+	return tracerr.Wrap(meddler.Insert(l2db.dbWrite, "tx_pool", insertTx))
 }
 
 // selectPoolTxCommon select part of queries to get common.PoolL2Tx
@@ -176,14 +175,15 @@ tx_pool.to_bjj, tx_pool.token_id, tx_pool.amount, tx_pool.fee, tx_pool.nonce,
 tx_pool.state, tx_pool.info, tx_pool.signature, tx_pool.timestamp, rq_from_idx, 
 rq_to_idx, tx_pool.rq_to_eth_addr, tx_pool.rq_to_bjj, tx_pool.rq_token_id, tx_pool.rq_amount, 
 tx_pool.rq_fee, tx_pool.rq_nonce, tx_pool.tx_type, 
-fee_percentage(tx_pool.fee::NUMERIC) * token.usd * tx_pool.amount_f AS fee_usd, token.usd_update  
+(fee_percentage(tx_pool.fee::NUMERIC) * token.usd * tx_pool.amount_f) /
+	(10.0 ^ token.decimals::NUMERIC) AS fee_usd, token.usd_update
 FROM tx_pool INNER JOIN token ON tx_pool.token_id = token.token_id `
 
 // GetTx  return the specified Tx in common.PoolL2Tx format
 func (l2db *L2DB) GetTx(txID common.TxID) (*common.PoolL2Tx, error) {
 	tx := new(common.PoolL2Tx)
 	return tx, tracerr.Wrap(meddler.QueryRow(
-		l2db.db, tx,
+		l2db.dbRead, tx,
 		selectPoolTxCommon+"WHERE tx_id = $1;",
 		txID,
 	))
@@ -193,7 +193,7 @@ func (l2db *L2DB) GetTx(txID common.TxID) (*common.PoolL2Tx, error) {
 func (l2db *L2DB) GetPendingTxs() ([]common.PoolL2Tx, error) {
 	var txs []*common.PoolL2Tx
 	err := meddler.QueryAll(
-		l2db.db, &txs,
+		l2db.dbRead, &txs,
 		selectPoolTxCommon+"WHERE state = $1",
 		common.PoolL2TxStatePending,
 	)
@@ -218,8 +218,8 @@ func (l2db *L2DB) StartForging(txIDs []common.TxID, batchNum common.BatchNum) er
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
-	query = l2db.db.Rebind(query)
-	_, err = l2db.db.Exec(query, args...)
+	query = l2db.dbWrite.Rebind(query)
+	_, err = l2db.dbWrite.Exec(query, args...)
 	return tracerr.Wrap(err)
 }
 
@@ -241,8 +241,8 @@ func (l2db *L2DB) DoneForging(txIDs []common.TxID, batchNum common.BatchNum) err
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
-	query = l2db.db.Rebind(query)
-	_, err = l2db.db.Exec(query, args...)
+	query = l2db.dbWrite.Rebind(query)
+	_, err = l2db.dbWrite.Exec(query, args...)
 	return tracerr.Wrap(err)
 }
 
@@ -263,8 +263,8 @@ func (l2db *L2DB) InvalidateTxs(txIDs []common.TxID, batchNum common.BatchNum) e
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
-	query = l2db.db.Rebind(query)
-	_, err = l2db.db.Exec(query, args...)
+	query = l2db.dbWrite.Rebind(query)
+	_, err = l2db.dbWrite.Exec(query, args...)
 	return tracerr.Wrap(err)
 }
 
@@ -272,7 +272,7 @@ func (l2db *L2DB) InvalidateTxs(txIDs []common.TxID, batchNum common.BatchNum) e
 // of unique FromIdx
 func (l2db *L2DB) GetPendingUniqueFromIdxs() ([]common.Idx, error) {
 	var idxs []common.Idx
-	rows, err := l2db.db.Query(`SELECT DISTINCT from_idx FROM tx_pool
+	rows, err := l2db.dbRead.Query(`SELECT DISTINCT from_idx FROM tx_pool
 		WHERE state = $1;`, common.PoolL2TxStatePending)
 	if err != nil {
 		return nil, tracerr.Wrap(err)
@@ -313,7 +313,7 @@ func (l2db *L2DB) InvalidateOldNonces(updatedAccounts []common.IdxNonce, batchNu
 	// named query which works with slices, and doens't handle an extra
 	// individual argument.
 	query := fmt.Sprintf(invalidateOldNoncesQuery, batchNum)
-	if _, err := sqlx.NamedExec(l2db.db, query, updatedAccounts); err != nil {
+	if _, err := sqlx.NamedExec(l2db.dbWrite, query, updatedAccounts); err != nil {
 		return tracerr.Wrap(err)
 	}
 	return nil
@@ -322,7 +322,7 @@ func (l2db *L2DB) InvalidateOldNonces(updatedAccounts []common.IdxNonce, batchNu
 // Reorg updates the state of txs that were updated in a batch that has been discarted due to a blockchain reorg.
 // The state of the affected txs can change form Forged -> Pending or from Invalid -> Pending
 func (l2db *L2DB) Reorg(lastValidBatch common.BatchNum) error {
-	_, err := l2db.db.Exec(
+	_, err := l2db.dbWrite.Exec(
 		`UPDATE tx_pool SET batch_num = NULL, state = $1
 		WHERE (state = $2 OR state = $3 OR state = $4) AND batch_num > $5`,
 		common.PoolL2TxStatePending,
@@ -338,7 +338,7 @@ func (l2db *L2DB) Reorg(lastValidBatch common.BatchNum) error {
 // it also deletes pending txs that have been in the L2DB for longer than the ttl if maxTxs has been exceeded
 func (l2db *L2DB) Purge(currentBatchNum common.BatchNum) (err error) {
 	now := time.Now().UTC().Unix()
-	_, err = l2db.db.Exec(
+	_, err = l2db.dbWrite.Exec(
 		`DELETE FROM tx_pool WHERE (
 			batch_num < $1 AND (state = $2 OR state = $3)
 		) OR (
@@ -354,3 +354,14 @@ func (l2db *L2DB) Purge(currentBatchNum common.BatchNum) (err error) {
 	)
 	return tracerr.Wrap(err)
 }
+
+// PurgeByExternalDelete deletes all pending transactions marked with true in
+// the `external_delete` column.  An external process can set this column to
+// true to instruct the coordinator to delete the tx when possible.
+func (l2db *L2DB) PurgeByExternalDelete() error {
+	_, err := l2db.dbWrite.Exec(
+		`DELETE from tx_pool WHERE (external_delete = true AND state = $1);`,
+		common.PoolL2TxStatePending,
+	)
+	return tracerr.Wrap(err)
+}

db/l2db/l2db_test.go

@@ -1,8 +1,8 @@
 package l2db
 
 import (
-	"math"
-	"math/big"
+	"database/sql"
+	"fmt"
 	"os"
 	"testing"
 	"time"
@@ -20,12 +20,14 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+var decimals = uint64(3)
+var tokenValue = 1.0 // The price update gives a value of 1.0 USD to the token
 var l2DB *L2DB
 var l2DBWithACC *L2DB
 var historyDB *historydb.HistoryDB
 var tc *til.Context
 var tokens map[common.TokenID]historydb.TokenWithUSD
-var tokensValue map[common.TokenID]float64
+
 var accs map[common.Idx]common.Account
 
 func TestMain(m *testing.M) {
@@ -35,11 +37,11 @@ func TestMain(m *testing.M) {
 	if err != nil {
 		panic(err)
 	}
-	l2DB = NewL2DB(db, 10, 1000, 24*time.Hour, nil)
+	l2DB = NewL2DB(db, db, 10, 1000, 0.0, 24*time.Hour, nil)
 	apiConnCon := dbUtils.NewAPICnnectionController(1, time.Second)
-	l2DBWithACC = NewL2DB(db, 10, 1000, 24*time.Hour, apiConnCon)
+	l2DBWithACC = NewL2DB(db, db, 10, 1000, 0.0, 24*time.Hour, apiConnCon)
 	test.WipeDB(l2DB.DB())
-	historyDB = historydb.NewHistoryDB(db, nil)
+	historyDB = historydb.NewHistoryDB(db, db, nil)
 	// Run tests
 	result := m.Run()
 	// Close DB
@@ -58,10 +60,10 @@ func prepareHistoryDB(historyDB *historydb.HistoryDB) error {
 
 			AddToken(1)
 			AddToken(2)
-			CreateAccountDeposit(1) A: 2000
-			CreateAccountDeposit(2) A: 2000
-			CreateAccountDeposit(1) B: 1000
-			CreateAccountDeposit(2) B: 1000
+			CreateAccountDeposit(1) A: 20000
+			CreateAccountDeposit(2) A: 20000
+			CreateAccountDeposit(1) B: 10000
+			CreateAccountDeposit(2) B: 10000
 			> batchL1 
 			> batchL1
 			> block
@@ -82,15 +84,23 @@ func prepareHistoryDB(historyDB *historydb.HistoryDB) error {
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
+	for i := range blocks {
+		block := &blocks[i]
+		for j := range block.Rollup.AddedTokens {
+			token := &block.Rollup.AddedTokens[j]
+			token.Name = fmt.Sprintf("Token %d", token.TokenID)
+			token.Symbol = fmt.Sprintf("TK%d", token.TokenID)
+			token.Decimals = decimals
+		}
+	}
+
 	tokens = make(map[common.TokenID]historydb.TokenWithUSD)
-	tokensValue = make(map[common.TokenID]float64)
+	// tokensValue = make(map[common.TokenID]float64)
 	accs = make(map[common.Idx]common.Account)
-	value := 5 * 5.389329
 	now := time.Now().UTC()
 	// Add all blocks except for the last one
 	for i := range blocks[:len(blocks)-1] {
-		err = historyDB.AddBlockSCData(&blocks[i])
-		if err != nil {
+		if err := historyDB.AddBlockSCData(&blocks[i]); err != nil {
 			return tracerr.Wrap(err)
 		}
 		for _, batch := range blocks[i].Rollup.Batches {
@@ -106,39 +116,38 @@ func prepareHistoryDB(historyDB *historydb.HistoryDB) error {
 				Name:        token.Name,
 				Symbol:      token.Symbol,
 				Decimals:    token.Decimals,
+				USD:         &tokenValue,
+				USDUpdate:   &now,
 			}
-			tokensValue[token.TokenID] = value / math.Pow(10, float64(token.Decimals))
-			readToken.USDUpdate = &now
-			readToken.USD = &value
 			tokens[token.TokenID] = readToken
-		}
-		// Set value to the tokens (tokens have no symbol)
-		tokenSymbol := ""
-		err := historyDB.UpdateTokenValue(tokenSymbol, value)
-		if err != nil {
-			return tracerr.Wrap(err)
+			// Set value to the tokens
+			err := historyDB.UpdateTokenValue(readToken.Symbol, *readToken.USD)
+			if err != nil {
+				return tracerr.Wrap(err)
+			}
 		}
 	}
 	return nil
 }
 
 func generatePoolL2Txs() ([]common.PoolL2Tx, error) {
+	// Fee = 126 corresponds to ~10%
 	setPool := `
 			Type: PoolL2
-			PoolTransfer(1) A-B: 6 (4)
-			PoolTransfer(2) A-B: 3 (1)
-			PoolTransfer(1) B-A: 5 (2)
-			PoolTransfer(2) B-A: 10 (3)
-			PoolTransfer(1) A-B: 7 (2)
-			PoolTransfer(2) A-B: 2 (1)
-			PoolTransfer(1) B-A: 8 (2)
-			PoolTransfer(2) B-A: 1 (1)
-			PoolTransfer(1) A-B: 3 (1)
-			PoolTransferToEthAddr(2) B-A: 5 (2)
-			PoolTransferToBJJ(2) B-A: 5 (2)
+			PoolTransfer(1) A-B: 6000 (126)
+			PoolTransfer(2) A-B: 3000 (126)
+			PoolTransfer(1) B-A: 5000 (126)
+			PoolTransfer(2) B-A: 10000 (126)
+			PoolTransfer(1) A-B: 7000 (126)
+			PoolTransfer(2) A-B: 2000 (126)
+			PoolTransfer(1) B-A: 8000 (126)
+			PoolTransfer(2) B-A: 1000 (126)
+			PoolTransfer(1) A-B: 3000 (126)
+			PoolTransferToEthAddr(2) B-A: 5000 (126)
+			PoolTransferToBJJ(2) B-A: 5000 (126)
 
-			PoolExit(1) A: 5 (2)
-			PoolExit(2) B: 3 (1)
+			PoolExit(1) A: 5000 (126)
+			PoolExit(2) B: 3000 (126)
 		`
 	poolL2Txs, err := tc.GeneratePoolL2Txs(setPool)
 	if err != nil {
@@ -153,25 +162,74 @@ func TestAddTxTest(t *testing.T) {
 		log.Error("Error prepare historyDB", err)
 	}
 	poolL2Txs, err := generatePoolL2Txs()
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	for i := range poolL2Txs {
 		err := l2DB.AddTxTest(&poolL2Txs[i])
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		fetchedTx, err := l2DB.GetTx(poolL2Txs[i].TxID)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		assertTx(t, &poolL2Txs[i], fetchedTx)
 		nameZone, offset := fetchedTx.Timestamp.Zone()
 		assert.Equal(t, "UTC", nameZone)
 		assert.Equal(t, 0, offset)
 	}
 }
+
+func TestAddTxAPI(t *testing.T) {
+	err := prepareHistoryDB(historyDB)
+	if err != nil {
+		log.Error("Error prepare historyDB", err)
+	}
+
+	oldMaxTxs := l2DBWithACC.maxTxs
+	// set max number of pending txs that can be kept in the pool to 5
+	l2DBWithACC.maxTxs = 5
+
+	poolL2Txs, err := generatePoolL2Txs()
+	txs := make([]*PoolL2TxWrite, len(poolL2Txs))
+	for i := range poolL2Txs {
+		txs[i] = NewPoolL2TxWriteFromPoolL2Tx(&poolL2Txs[i])
+	}
+	require.NoError(t, err)
+	require.GreaterOrEqual(t, len(poolL2Txs), 8)
+	for i := range txs[:5] {
+		err := l2DBWithACC.AddTxAPI(txs[i])
+		require.NoError(t, err)
+		fetchedTx, err := l2DB.GetTx(poolL2Txs[i].TxID)
+		require.NoError(t, err)
+		assertTx(t, &poolL2Txs[i], fetchedTx)
+		nameZone, offset := fetchedTx.Timestamp.Zone()
+		assert.Equal(t, "UTC", nameZone)
+		assert.Equal(t, 0, offset)
+	}
+	err = l2DBWithACC.AddTxAPI(txs[5])
+	assert.Equal(t, errPoolFull, tracerr.Unwrap(err))
+	// reset maxTxs to original value
+	l2DBWithACC.maxTxs = oldMaxTxs
+
+	// set minFeeUSD to a high value than the tx feeUSD to test the error
+	// of inserting a tx with lower than min fee
+	oldMinFeeUSD := l2DBWithACC.minFeeUSD
+	tx := txs[5]
+	feeAmount, err := common.CalcFeeAmount(tx.Amount, tx.Fee)
+	require.NoError(t, err)
+	feeAmountUSD := common.TokensToUSD(feeAmount, decimals, tokenValue)
+	// set minFeeUSD higher than the tx fee to trigger the error
+	l2DBWithACC.minFeeUSD = feeAmountUSD + 1
+	err = l2DBWithACC.AddTxAPI(tx)
+	require.Error(t, err)
+	assert.Regexp(t, "tx.feeUSD (.*) < minFeeUSD (.*)", err.Error())
+	// reset minFeeUSD to original value
+	l2DBWithACC.minFeeUSD = oldMinFeeUSD
+}
+
 func TestUpdateTxsInfo(t *testing.T) {
 	err := prepareHistoryDB(historyDB)
 	if err != nil {
 		log.Error("Error prepare historyDB", err)
 	}
 	poolL2Txs, err := generatePoolL2Txs()
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	for i := range poolL2Txs {
 		err := l2DB.AddTxTest(&poolL2Txs[i])
 		require.NoError(t, err)
@@ -185,7 +243,7 @@ func TestUpdateTxsInfo(t *testing.T) {
 
 	for i := range poolL2Txs {
 		fetchedTx, err := l2DB.GetTx(poolL2Txs[i].TxID)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		assert.Equal(t, "test", fetchedTx.Info)
 	}
 }
@@ -203,9 +261,8 @@ func assertTx(t *testing.T, expected, actual *common.PoolL2Tx) {
 		assert.Less(t, token.USDUpdate.Unix()-3, actual.AbsoluteFeeUpdate.Unix())
 		expected.AbsoluteFeeUpdate = actual.AbsoluteFeeUpdate
 		// Set expected fee
-		f := new(big.Float).SetInt(expected.Amount)
-		amountF, _ := f.Float64()
-		expected.AbsoluteFee = *token.USD * amountF * expected.Fee.Percentage()
+		amountUSD := common.TokensToUSD(expected.Amount, token.Decimals, *token.USD)
+		expected.AbsoluteFee = amountUSD * expected.Fee.Percentage()
 		test.AssertUSD(t, &expected.AbsoluteFee, &actual.AbsoluteFee)
 	}
 	assert.Equal(t, expected, actual)
@@ -230,19 +287,28 @@ func TestGetPending(t *testing.T) {
 		log.Error("Error prepare historyDB", err)
 	}
 	poolL2Txs, err := generatePoolL2Txs()
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	var pendingTxs []*common.PoolL2Tx
 	for i := range poolL2Txs {
 		err := l2DB.AddTxTest(&poolL2Txs[i])
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		pendingTxs = append(pendingTxs, &poolL2Txs[i])
 	}
 	fetchedTxs, err := l2DB.GetPendingTxs()
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	assert.Equal(t, len(pendingTxs), len(fetchedTxs))
 	for i := range fetchedTxs {
 		assertTx(t, pendingTxs[i], &fetchedTxs[i])
 	}
+	// Check AbsoluteFee amount
+	for i := range fetchedTxs {
+		tx := &fetchedTxs[i]
+		feeAmount, err := common.CalcFeeAmount(tx.Amount, tx.Fee)
+		require.NoError(t, err)
+		feeAmountUSD := common.TokensToUSD(feeAmount,
+			tokens[tx.TokenID].Decimals, *tokens[tx.TokenID].USD)
+		assert.InEpsilon(t, feeAmountUSD, tx.AbsoluteFee, 0.01)
+	}
 }
 
 func TestStartForging(t *testing.T) {
@@ -253,13 +319,13 @@ func TestStartForging(t *testing.T) {
 		log.Error("Error prepare historyDB", err)
 	}
 	poolL2Txs, err := generatePoolL2Txs()
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	var startForgingTxIDs []common.TxID
 	randomizer := 0
 	// Add txs to DB
 	for i := range poolL2Txs {
 		err := l2DB.AddTxTest(&poolL2Txs[i])
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		if poolL2Txs[i].State == common.PoolL2TxStatePending && randomizer%2 == 0 {
 			startForgingTxIDs = append(startForgingTxIDs, poolL2Txs[i].TxID)
 		}
@@ -267,11 +333,11 @@ func TestStartForging(t *testing.T) {
 	}
 	// Start forging txs
 	err = l2DB.StartForging(startForgingTxIDs, fakeBatchNum)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// Fetch txs and check that they've been updated correctly
 	for _, id := range startForgingTxIDs {
 		fetchedTx, err := l2DBWithACC.GetTxAPI(id)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		assert.Equal(t, common.PoolL2TxStateForging, fetchedTx.State)
 		assert.Equal(t, &fakeBatchNum, fetchedTx.BatchNum)
 	}
@@ -285,13 +351,13 @@ func TestDoneForging(t *testing.T) {
 		log.Error("Error prepare historyDB", err)
 	}
 	poolL2Txs, err := generatePoolL2Txs()
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	var startForgingTxIDs []common.TxID
 	randomizer := 0
 	// Add txs to DB
 	for i := range poolL2Txs {
 		err := l2DB.AddTxTest(&poolL2Txs[i])
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		if poolL2Txs[i].State == common.PoolL2TxStatePending && randomizer%2 == 0 {
 			startForgingTxIDs = append(startForgingTxIDs, poolL2Txs[i].TxID)
 		}
@@ -299,7 +365,7 @@ func TestDoneForging(t *testing.T) {
 	}
 	// Start forging txs
 	err = l2DB.StartForging(startForgingTxIDs, fakeBatchNum)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 
 	var doneForgingTxIDs []common.TxID
 	randomizer = 0
@@ -311,12 +377,12 @@ func TestDoneForging(t *testing.T) {
 	}
 	// Done forging txs
 	err = l2DB.DoneForging(doneForgingTxIDs, fakeBatchNum)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 
 	// Fetch txs and check that they've been updated correctly
 	for _, id := range doneForgingTxIDs {
 		fetchedTx, err := l2DBWithACC.GetTxAPI(id)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		assert.Equal(t, common.PoolL2TxStateForged, fetchedTx.State)
 		assert.Equal(t, &fakeBatchNum, fetchedTx.BatchNum)
 	}
@@ -330,13 +396,13 @@ func TestInvalidate(t *testing.T) {
 		log.Error("Error prepare historyDB", err)
 	}
 	poolL2Txs, err := generatePoolL2Txs()
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	var invalidTxIDs []common.TxID
 	randomizer := 0
 	// Add txs to DB
 	for i := range poolL2Txs {
 		err := l2DB.AddTxTest(&poolL2Txs[i])
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		if poolL2Txs[i].State != common.PoolL2TxStateInvalid && randomizer%2 == 0 {
 			randomizer++
 			invalidTxIDs = append(invalidTxIDs, poolL2Txs[i].TxID)
@@ -344,11 +410,11 @@ func TestInvalidate(t *testing.T) {
 	}
 	// Invalidate txs
 	err = l2DB.InvalidateTxs(invalidTxIDs, fakeBatchNum)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// Fetch txs and check that they've been updated correctly
 	for _, id := range invalidTxIDs {
 		fetchedTx, err := l2DBWithACC.GetTxAPI(id)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		assert.Equal(t, common.PoolL2TxStateInvalid, fetchedTx.State)
 		assert.Equal(t, &fakeBatchNum, fetchedTx.BatchNum)
 	}
@@ -362,7 +428,7 @@ func TestInvalidateOldNonces(t *testing.T) {
 		log.Error("Error prepare historyDB", err)
 	}
 	poolL2Txs, err := generatePoolL2Txs()
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// Update Accounts currentNonce
 	var updateAccounts []common.IdxNonce
 	var currentNonce = common.Nonce(1)
@@ -379,13 +445,13 @@ func TestInvalidateOldNonces(t *testing.T) {
 			invalidTxIDs = append(invalidTxIDs, poolL2Txs[i].TxID)
 		}
 		err := l2DB.AddTxTest(&poolL2Txs[i])
-		assert.NoError(t, err)
+		require.NoError(t, err)
 	}
 	// sanity check
 	require.Greater(t, len(invalidTxIDs), 0)
 
 	err = l2DB.InvalidateOldNonces(updateAccounts, fakeBatchNum)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// Fetch txs and check that they've been updated correctly
 	for _, id := range invalidTxIDs {
 		fetchedTx, err := l2DBWithACC.GetTxAPI(id)
@@ -407,7 +473,7 @@ func TestReorg(t *testing.T) {
 		log.Error("Error prepare historyDB", err)
 	}
 	poolL2Txs, err := generatePoolL2Txs()
-	assert.NoError(t, err)
+	require.NoError(t, err)
 
 	reorgedTxIDs := []common.TxID{}
 	nonReorgedTxIDs := []common.TxID{}
@@ -418,7 +484,7 @@ func TestReorg(t *testing.T) {
 	// Add txs to DB
 	for i := range poolL2Txs {
 		err := l2DB.AddTxTest(&poolL2Txs[i])
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		if poolL2Txs[i].State == common.PoolL2TxStatePending && randomizer%2 == 0 {
 			startForgingTxIDs = append(startForgingTxIDs, poolL2Txs[i].TxID)
 			allTxRandomize = append(allTxRandomize, poolL2Txs[i].TxID)
@@ -430,7 +496,7 @@ func TestReorg(t *testing.T) {
 	}
 	// Start forging txs
 	err = l2DB.StartForging(startForgingTxIDs, lastValidBatch)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 
 	var doneForgingTxIDs []common.TxID
 	randomizer = 0
@@ -455,22 +521,22 @@ func TestReorg(t *testing.T) {
 
 	// Invalidate txs BEFORE reorgBatch --> nonReorg
 	err = l2DB.InvalidateTxs(invalidTxIDs, lastValidBatch)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// Done forging txs in reorgBatch --> Reorg
 	err = l2DB.DoneForging(doneForgingTxIDs, reorgBatch)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 
 	err = l2DB.Reorg(lastValidBatch)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	for _, id := range reorgedTxIDs {
 		tx, err := l2DBWithACC.GetTxAPI(id)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		assert.Nil(t, tx.BatchNum)
 		assert.Equal(t, common.PoolL2TxStatePending, tx.State)
 	}
 	for _, id := range nonReorgedTxIDs {
 		fetchedTx, err := l2DBWithACC.GetTxAPI(id)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		assert.Equal(t, lastValidBatch, *fetchedTx.BatchNum)
 	}
 }
@@ -487,7 +553,7 @@ func TestReorg2(t *testing.T) {
 		log.Error("Error prepare historyDB", err)
 	}
 	poolL2Txs, err := generatePoolL2Txs()
-	assert.NoError(t, err)
+	require.NoError(t, err)
 
 	reorgedTxIDs := []common.TxID{}
 	nonReorgedTxIDs := []common.TxID{}
@@ -498,7 +564,7 @@ func TestReorg2(t *testing.T) {
 	// Add txs to DB
 	for i := range poolL2Txs {
 		err := l2DB.AddTxTest(&poolL2Txs[i])
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		if poolL2Txs[i].State == common.PoolL2TxStatePending && randomizer%2 == 0 {
 			startForgingTxIDs = append(startForgingTxIDs, poolL2Txs[i].TxID)
 			allTxRandomize = append(allTxRandomize, poolL2Txs[i].TxID)
@@ -510,7 +576,7 @@ func TestReorg2(t *testing.T) {
 	}
 	// Start forging txs
 	err = l2DB.StartForging(startForgingTxIDs, lastValidBatch)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 
 	var doneForgingTxIDs []common.TxID
 	randomizer = 0
@@ -532,22 +598,22 @@ func TestReorg2(t *testing.T) {
 	}
 	// Done forging txs BEFORE reorgBatch --> nonReorg
 	err = l2DB.DoneForging(doneForgingTxIDs, lastValidBatch)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// Invalidate txs in reorgBatch --> Reorg
 	err = l2DB.InvalidateTxs(invalidTxIDs, reorgBatch)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 
 	err = l2DB.Reorg(lastValidBatch)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	for _, id := range reorgedTxIDs {
 		tx, err := l2DBWithACC.GetTxAPI(id)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		assert.Nil(t, tx.BatchNum)
 		assert.Equal(t, common.PoolL2TxStatePending, tx.State)
 	}
 	for _, id := range nonReorgedTxIDs {
 		fetchedTx, err := l2DBWithACC.GetTxAPI(id)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		assert.Equal(t, lastValidBatch, *fetchedTx.BatchNum)
 	}
 }
@@ -563,7 +629,7 @@ func TestPurge(t *testing.T) {
 	var poolL2Tx []common.PoolL2Tx
 	for i := 0; i < generateTx; i++ {
 		poolL2TxAux, err := generatePoolL2Txs()
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		poolL2Tx = append(poolL2Tx, poolL2TxAux...)
 	}
 
@@ -590,39 +656,39 @@ func TestPurge(t *testing.T) {
 			deletedIDs = append(deletedIDs, poolL2Tx[i].TxID)
 		}
 		err := l2DB.AddTxTest(&tx)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 	}
 	// Set batchNum keeped txs
 	for i := range keepedIDs {
-		_, err = l2DB.db.Exec(
+		_, err = l2DB.dbWrite.Exec(
 			"UPDATE tx_pool SET batch_num = $1 WHERE tx_id = $2;",
 			safeBatchNum, keepedIDs[i],
 		)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 	}
 	// Start forging txs and set batchNum
 	err = l2DB.StartForging(doneForgingTxIDs, toDeleteBatchNum)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// Done forging txs and set batchNum
 	err = l2DB.DoneForging(doneForgingTxIDs, toDeleteBatchNum)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// Invalidate txs and set batchNum
 	err = l2DB.InvalidateTxs(invalidTxIDs, toDeleteBatchNum)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// Update timestamp of afterTTL txs
 	deleteTimestamp := time.Unix(time.Now().UTC().Unix()-int64(l2DB.ttl.Seconds()+float64(4*time.Second)), 0)
 	for _, id := range afterTTLIDs {
 		// Set timestamp
-		_, err = l2DB.db.Exec(
+		_, err = l2DB.dbWrite.Exec(
 			"UPDATE tx_pool SET timestamp = $1, state = $2 WHERE tx_id = $3;",
 			deleteTimestamp, common.PoolL2TxStatePending, id,
 		)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 	}
 
 	// Purge txs
 	err = l2DB.Purge(safeBatchNum)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 	// Check results
 	for _, id := range deletedIDs {
 		_, err := l2DB.GetTx(id)
@@ -630,7 +696,7 @@ func TestPurge(t *testing.T) {
 	}
 	for _, id := range keepedIDs {
 		_, err := l2DB.GetTx(id)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 	}
 }
 
@@ -644,10 +710,10 @@ func TestAuth(t *testing.T) {
 	for i := 0; i < len(auths); i++ {
 		// Add to the DB
 		err := l2DB.AddAccountCreationAuth(auths[i])
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		// Fetch from DB
 		auth, err := l2DB.GetAccountCreationAuth(auths[i].EthAddr)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		// Check fetched vs generated
 		assert.Equal(t, auths[i].EthAddr, auth.EthAddr)
 		assert.Equal(t, auths[i].BJJ, auth.BJJ)
@@ -665,7 +731,7 @@ func TestAddGet(t *testing.T) {
 		log.Error("Error prepare historyDB", err)
 	}
 	poolL2Txs, err := generatePoolL2Txs()
-	assert.NoError(t, err)
+	require.NoError(t, err)
 
 	// We will work with only 3 txs
 	require.GreaterOrEqual(t, len(poolL2Txs), 3)
@@ -701,3 +767,56 @@ func TestAddGet(t *testing.T) {
 		assert.Equal(t, txs[i], *dbTx)
 	}
 }
+
+func TestPurgeByExternalDelete(t *testing.T) {
+	err := prepareHistoryDB(historyDB)
+	if err != nil {
+		log.Error("Error prepare historyDB", err)
+	}
+	txs, err := generatePoolL2Txs()
+	require.NoError(t, err)
+
+	// We will work with 8 txs
+	require.GreaterOrEqual(t, len(txs), 8)
+	txs = txs[:8]
+	for i := range txs {
+		require.NoError(t, l2DB.AddTxTest(&txs[i]))
+	}
+
+	// We will recreate this scenario:
+	// tx index, status , external_delete
+	// 0       , pending, false
+	// 1       , pending, false
+	// 2       , pending, true // will be deleted
+	// 3       , pending, true // will be deleted
+	// 4       , fging  , false
+	// 5       , fging  , false
+	// 6       , fging  , true
+	// 7       , fging  , true
+
+	require.NoError(t, l2DB.StartForging(
+		[]common.TxID{txs[4].TxID, txs[5].TxID, txs[6].TxID, txs[7].TxID},
+		1))
+	_, err = l2DB.dbWrite.Exec(
+		`UPDATE tx_pool SET external_delete = true WHERE
+			tx_id IN ($1, $2, $3, $4)
+		;`,
+		txs[2].TxID, txs[3].TxID, txs[6].TxID, txs[7].TxID,
+	)
+	require.NoError(t, err)
+	require.NoError(t, l2DB.PurgeByExternalDelete())
+
+	// Query txs that are have been not deleted
+	for _, i := range []int{0, 1, 4, 5, 6, 7} {
+		txID := txs[i].TxID
+		_, err := l2DB.GetTx(txID)
+		require.NoError(t, err)
+	}
+
+	// Query txs that have been deleted
+	for _, i := range []int{2, 3} {
+		txID := txs[i].TxID
+		_, err := l2DB.GetTx(txID)
+		require.Equal(t, sql.ErrNoRows, tracerr.Unwrap(err))
+	}
+}

db/l2db/views.go

@@ -34,6 +34,7 @@ type PoolL2TxWrite struct {
 	RqFee       *common.FeeSelector    `meddler:"rq_fee"`
 	RqNonce     *common.Nonce          `meddler:"rq_nonce"`
 	Type        common.TxType          `meddler:"tx_type"`
+	ClientIP    string                 `meddler:"client_ip"`
 }
 
 // PoolTxAPI represents a L2 Tx pool with extra metadata used by the API

db/migrations/0001.sql

@@ -47,7 +47,7 @@ CREATE TABLE token (
     name VARCHAR(20) NOT NULL,
     symbol VARCHAR(10) NOT NULL,
     decimals INT NOT NULL,
-    usd NUMERIC,
+    usd NUMERIC, -- value of a normalized token (1 token = 10^decimals units)
     usd_update TIMESTAMP WITHOUT TIME ZONE
 );
 
@@ -100,6 +100,15 @@ CREATE TABLE account (
     eth_addr BYTEA NOT NULL
 );
 
+CREATE TABLE account_update (
+    item_id SERIAL,
+    eth_block_num BIGINT NOT NULL REFERENCES block (eth_block_num) ON DELETE CASCADE,
+    batch_num BIGINT NOT NULL REFERENCES batch (batch_num) ON DELETE CASCADE,
+    idx BIGINT NOT NULL REFERENCES account (idx) ON DELETE CASCADE,
+    nonce BIGINT NOT NULL,
+    balance BYTEA NOT NULL
+);
+
 CREATE TABLE exit_tree (
     item_id SERIAL PRIMARY KEY,
     batch_num BIGINT REFERENCES batch (batch_num) ON DELETE CASCADE,
@@ -618,7 +627,9 @@ CREATE TABLE tx_pool (
     rq_amount BYTEA,
     rq_fee SMALLINT,
     rq_nonce BIGINT,
-    tx_type VARCHAR(40) NOT NULL
+    tx_type VARCHAR(40) NOT NULL,
+    client_ip VARCHAR,
+    external_delete BOOLEAN NOT NULL DEFAULT false
 );
 
 -- +migrate StatementBegin
@@ -651,34 +662,35 @@ CREATE TABLE account_creation_auth (
 );
 
 -- +migrate Down
--- drop triggers
-DROP TRIGGER trigger_token_usd_update ON token;
-DROP TRIGGER trigger_set_tx ON tx;
-DROP TRIGGER trigger_forge_l1_txs ON batch;
-DROP TRIGGER trigger_set_pool_tx ON tx_pool;
--- drop functions
-DROP FUNCTION hez_idx;
-DROP FUNCTION set_token_usd_update;
-DROP FUNCTION fee_percentage;
-DROP FUNCTION set_tx;
-DROP FUNCTION forge_l1_user_txs;
-DROP FUNCTION set_pool_tx;
--- drop tables
-DROP TABLE account_creation_auth;
-DROP TABLE tx_pool;
-DROP TABLE auction_vars;
-DROP TABLE rollup_vars;
-DROP TABLE escape_hatch_withdrawal;
-DROP TABLE bucket_update;
-DROP TABLE token_exchange;
-DROP TABLE wdelayer_vars;
-DROP TABLE tx;
-DROP TABLE exit_tree;
-DROP TABLE account;
-DROP TABLE token;
-DROP TABLE bid;
-DROP TABLE batch;
-DROP TABLE coordinator;
-DROP TABLE block;
--- drop sequences
-DROP SEQUENCE tx_item_id;
+-- triggers
+DROP TRIGGER IF EXISTS trigger_token_usd_update ON token;
+DROP TRIGGER IF EXISTS trigger_set_tx ON tx;
+DROP TRIGGER IF EXISTS trigger_forge_l1_txs ON batch;
+DROP TRIGGER IF EXISTS trigger_set_pool_tx ON tx_pool;
+-- functions
+DROP FUNCTION IF EXISTS hez_idx;
+DROP FUNCTION IF EXISTS set_token_usd_update;
+DROP FUNCTION IF EXISTS fee_percentage;
+DROP FUNCTION IF EXISTS set_tx;
+DROP FUNCTION IF EXISTS forge_l1_user_txs;
+DROP FUNCTION IF EXISTS set_pool_tx;
+-- drop tables IF EXISTS
+DROP TABLE IF EXISTS account_creation_auth;
+DROP TABLE IF EXISTS tx_pool;
+DROP TABLE IF EXISTS auction_vars;
+DROP TABLE IF EXISTS rollup_vars;
+DROP TABLE IF EXISTS escape_hatch_withdrawal;
+DROP TABLE IF EXISTS bucket_update;
+DROP TABLE IF EXISTS token_exchange;
+DROP TABLE IF EXISTS wdelayer_vars;
+DROP TABLE IF EXISTS tx;
+DROP TABLE IF EXISTS exit_tree;
+DROP TABLE IF EXISTS account_update;
+DROP TABLE IF EXISTS account;
+DROP TABLE IF EXISTS token;
+DROP TABLE IF EXISTS bid;
+DROP TABLE IF EXISTS batch;
+DROP TABLE IF EXISTS coordinator;
+DROP TABLE IF EXISTS block;
+-- sequences
+DROP SEQUENCE IF EXISTS tx_item_id;

db/statedb/statedb.go

@@ -275,8 +275,7 @@ func (s *StateDB) GetAccount(idx common.Idx) (*common.Account, error) {
 	return GetAccountInTreeDB(s.db.DB(), idx)
 }
 
-// AccountsIter iterates over all the accounts in db, calling fn for each one
-func AccountsIter(db db.Storage, fn func(a *common.Account) (bool, error)) error {
+func accountsIter(db db.Storage, fn func(a *common.Account) (bool, error)) error {
 	idxDB := db.WithPrefix(PrefixKeyIdx)
 	if err := idxDB.Iterate(func(k []byte, v []byte) (bool, error) {
 		idx, err := common.IdxFromBytes(k)

eth/ethereum.go

@@ -324,5 +324,6 @@ func (c *EthereumClient) EthCall(ctx context.Context, tx *types.Transaction,
 		Value:    tx.Value(),
 		Data:     tx.Data(),
 	}
-	return c.client.CallContract(ctx, msg, blockNum)
+	result, err := c.client.CallContract(ctx, msg, blockNum)
+	return result, tracerr.Wrap(err)
 }

eth/rollup.go

@@ -327,7 +327,7 @@ func (c *RollupClient) RollupForgeBatch(args *RollupForgeBatchArgs, auth *bind.T
 	if auth == nil {
 		auth, err = c.client.NewAuth()
 		if err != nil {
-			return nil, err
+			return nil, tracerr.Wrap(err)
 		}
 		auth.GasLimit = 1000000
 	}
@@ -393,7 +393,7 @@ func (c *RollupClient) RollupForgeBatch(args *RollupForgeBatchArgs, auth *bind.T
 		l1CoordinatorBytes, l1l2TxData, feeIdxCoordinator, args.VerifierIdx, args.L1Batch,
 		args.ProofA, args.ProofB, args.ProofC)
 	if err != nil {
-		return nil, tracerr.Wrap(fmt.Errorf("Failed Hermez.ForgeBatch: %w", err))
+		return nil, tracerr.Wrap(fmt.Errorf("Hermez.ForgeBatch: %w", err))
 	}
 	return tx, nil
 }

go.mod

@@ -21,6 +21,7 @@ require (
 	github.com/miguelmota/go-ethereum-hdwallet v0.0.0-20200123000308-a60dcd172b4c
 	github.com/mitchellh/copystructure v1.0.0
 	github.com/mitchellh/mapstructure v1.3.0
+	github.com/prometheus/client_golang v1.3.0
 	github.com/rubenv/sql-migrate v0.0.0-20200616145509-8d140a17f351
 	github.com/russross/meddler v1.0.0
 	github.com/stretchr/testify v1.6.1

go.sum

@@ -68,6 +68,7 @@ github.com/aws/aws-sdk-go-v2 v0.18.0/go.mod h1:JWVYvqSMppoMJC0x5wdwiImzgXTI9FuZw
 github.com/aymerick/raymond v2.0.3-0.20180322193309-b565731e1464+incompatible/go.mod h1:osfaiScAUVup+UC9Nfq76eWqDhXlp+4UYaA8uhTBO6g=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
 github.com/btcsuite/btcd v0.0.0-20171128150713-2e60448ffcc6/go.mod h1:Dmm/EzmjnCiweXmzRIAiUWCInVmPgjkzgv5k4tVyXiQ=
@@ -444,6 +445,7 @@ github.com/mattn/go-sqlite3 v1.12.0/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsO
 github.com/mattn/go-sqlite3 v2.0.3+incompatible h1:gXHsfypPkaMZrKbD5209QV9jbUTJKjyR5WD3HYQSd+U=
 github.com/mattn/go-sqlite3 v2.0.3+incompatible/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=
 github.com/mattn/goveralls v0.0.2/go.mod h1:8d1ZMHsd7fW6IRPKQh46F2WRpyib5/X4FOpevwGNQEw=
+github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/mediocregopher/mediocre-go-lib v0.0.0-20181029021733-cb65787f37ed/go.mod h1:dSsfyI2zABAdhcbvkXqgxOxrCsbYeHCPgrZkku60dSg=
 github.com/mediocregopher/radix/v3 v3.3.0/go.mod h1:EmfVyvspXz1uZEyPBMyGK+kjWiKQGvsUt6O3Pj+LDCQ=
@@ -544,23 +546,27 @@ github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829/go.mod
 github.com/prometheus/client_golang v0.9.3/go.mod h1:/TN21ttK/J9q6uSwhBd54HahCDft0ttaMvbicHlPoso=
 github.com/prometheus/client_golang v1.0.0/go.mod h1:db9x61etRT2tGnBNRi70OPL5FsnadC4Ky3P0J6CfImo=
 github.com/prometheus/client_golang v1.1.0/go.mod h1:I1FGZT9+L76gKKOs5djB6ezCbFQP1xR9D75/vuwEF3g=
+github.com/prometheus/client_golang v1.3.0 h1:miYCvYqFXtl/J9FIy8eNpBfYthAEFg+Ys0XyUVEcDsc=
 github.com/prometheus/client_golang v1.3.0/go.mod h1:hJaj2vgQTGQmVCsAACORcieXFeDPbaTKGT+JTgUa3og=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190115171406-56726106282f/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
+github.com/prometheus/client_model v0.1.0 h1:ElTg5tNp4DqfV7UQjDqv2+RJlNzsDtvNAWccbItceIE=
 github.com/prometheus/client_model v0.1.0/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/common v0.0.0-20181113130724-41aa239b4cce/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
 github.com/prometheus/common v0.2.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
 github.com/prometheus/common v0.4.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
 github.com/prometheus/common v0.4.1/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
 github.com/prometheus/common v0.6.0/go.mod h1:eBmuwkDJBwy6iBfxCBob6t6dR6ENT/y+J+Zk0j9GMYc=
+github.com/prometheus/common v0.7.0 h1:L+1lyG48J1zAQXA3RBX/nG/B3gjlHq0zTt2tlbJLyCY=
 github.com/prometheus/common v0.7.0/go.mod h1:DjGbpBbp5NYNiECxcL/VnbXCCaQpKd3tt26CguLLsqA=
 github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
 github.com/prometheus/procfs v0.0.0-20190117184657-bf6a532e95b1/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
 github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/prometheus/procfs v0.0.3/go.mod h1:4A/X28fw3Fc593LaREMrKMqOKvUAntwMDaekg4FpcdQ=
+github.com/prometheus/procfs v0.0.8 h1:+fpWZdT24pJBiqJdAwYBjPSk+5YmQzYNPYzQsdzLkt8=
 github.com/prometheus/procfs v0.0.8/go.mod h1:7Qr8sr6344vo1JqZ6HhLceV9o3AJ1Ff+GxbHq6oeK9A=
 github.com/prometheus/tsdb v0.6.2-0.20190402121629-4f204dcbc150/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
 github.com/prometheus/tsdb v0.7.1 h1:YZcsG11NqnK4czYLrWd9mpEuAJIHVQLwdrleYfszMAA=

log/log.go

@@ -67,6 +67,11 @@ func Init(levelStr string, outputs []string) {
 
 func sprintStackTrace(st []tracerr.Frame) string {
 	builder := strings.Builder{}
+	// Skip deepest frame because it belongs to the go runtime and we don't
+	// care about it.
+	if len(st) > 0 {
+		st = st[:len(st)-1]
+	}
 	for _, f := range st {
 		builder.WriteString(fmt.Sprintf("\n%s:%d %s()", f.Path, f.Line, f.Func))
 	}

node/node.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"net"
 	"net/http"
 	"sync"
 	"time"
@@ -62,27 +63,47 @@ type Node struct {
 	sync *synchronizer.Synchronizer
 
 	// General
-	cfg     *config.Node
-	mode    Mode
-	sqlConn *sqlx.DB
-	ctx     context.Context
-	wg      sync.WaitGroup
-	cancel  context.CancelFunc
+	cfg          *config.Node
+	mode         Mode
+	sqlConnRead  *sqlx.DB
+	sqlConnWrite *sqlx.DB
+	ctx          context.Context
+	wg           sync.WaitGroup
+	cancel       context.CancelFunc
 }
 
 // NewNode creates a Node
 func NewNode(mode Mode, cfg *config.Node) (*Node, error) {
 	meddler.Debug = cfg.Debug.MeddlerLogs
 	// Stablish DB connection
-	db, err := dbUtils.InitSQLDB(
-		cfg.PostgreSQL.Port,
-		cfg.PostgreSQL.Host,
-		cfg.PostgreSQL.User,
-		cfg.PostgreSQL.Password,
-		cfg.PostgreSQL.Name,
+	dbWrite, err := dbUtils.InitSQLDB(
+		cfg.PostgreSQL.PortWrite,
+		cfg.PostgreSQL.HostWrite,
+		cfg.PostgreSQL.UserWrite,
+		cfg.PostgreSQL.PasswordWrite,
+		cfg.PostgreSQL.NameWrite,
 	)
 	if err != nil {
-		return nil, tracerr.Wrap(err)
+		return nil, tracerr.Wrap(fmt.Errorf("dbUtils.InitSQLDB: %w", err))
+	}
+	var dbRead *sqlx.DB
+	if cfg.PostgreSQL.HostRead == "" {
+		dbRead = dbWrite
+	} else if cfg.PostgreSQL.HostRead == cfg.PostgreSQL.HostWrite {
+		return nil, tracerr.Wrap(fmt.Errorf(
+			"PostgreSQL.HostRead and PostgreSQL.HostWrite must be different",
+		))
+	} else {
+		dbRead, err = dbUtils.InitSQLDB(
+			cfg.PostgreSQL.PortRead,
+			cfg.PostgreSQL.HostRead,
+			cfg.PostgreSQL.UserRead,
+			cfg.PostgreSQL.PasswordRead,
+			cfg.PostgreSQL.NameRead,
+		)
+		if err != nil {
+			return nil, tracerr.Wrap(fmt.Errorf("dbUtils.InitSQLDB: %w", err))
+		}
 	}
 	var apiConnCon *dbUtils.APIConnectionController
 	if cfg.API.Explorer || mode == ModeCoordinator {
@@ -92,7 +113,7 @@ func NewNode(mode Mode, cfg *config.Node) (*Node, error) {
 		)
 	}
 
-	historyDB := historydb.NewHistoryDB(db, apiConnCon)
+	historyDB := historydb.NewHistoryDB(dbRead, dbWrite, apiConnCon)
 
 	ethClient, err := ethclient.Dial(cfg.Web3.URL)
 	if err != nil {
@@ -201,9 +222,10 @@ func NewNode(mode Mode, cfg *config.Node) (*Node, error) {
 	var l2DB *l2db.L2DB
 	if mode == ModeCoordinator {
 		l2DB = l2db.NewL2DB(
-			db,
+			dbRead, dbWrite,
 			cfg.Coordinator.L2DB.SafetyPeriod,
 			cfg.Coordinator.L2DB.MaxTxs,
+			cfg.Coordinator.L2DB.MinFeeUSD,
 			cfg.Coordinator.L2DB.TTL.Duration,
 			apiConnCon,
 		)
@@ -245,9 +267,6 @@ func NewNode(mode Mode, cfg *config.Node) (*Node, error) {
 		if err != nil {
 			return nil, tracerr.Wrap(err)
 		}
-		if err != nil {
-			return nil, tracerr.Wrap(err)
-		}
 		serverProofs := make([]prover.Client, len(cfg.Coordinator.ServerProofs))
 		for i, serverProofCfg := range cfg.Coordinator.ServerProofs {
 			serverProofs[i] = prover.NewProofServerClient(serverProofCfg.URL,
@@ -302,6 +321,7 @@ func NewNode(mode Mode, cfg *config.Node) (*Node, error) {
 				ForgeDelay:             cfg.Coordinator.ForgeDelay.Duration,
 				ForgeNoTxsDelay:        cfg.Coordinator.ForgeNoTxsDelay.Duration,
 				SyncRetryInterval:      cfg.Coordinator.SyncRetryInterval.Duration,
+				PurgeByExtDelInterval:  cfg.Coordinator.PurgeByExtDelInterval.Duration,
 				EthClientAttempts:      cfg.Coordinator.EthClient.Attempts,
 				EthClientAttemptsDelay: cfg.Coordinator.EthClient.AttemptsDelay.Duration,
 				EthNoReuseNonce:        cfg.Coordinator.EthClient.NoReuseNonce,
@@ -316,6 +336,7 @@ func NewNode(mode Mode, cfg *config.Node) (*Node, error) {
 					PurgeBlockDelay:      cfg.Coordinator.L2DB.PurgeBlockDelay,
 					InvalidateBlockDelay: cfg.Coordinator.L2DB.InvalidateBlockDelay,
 				},
+				ForgeBatchGasCost: cfg.Coordinator.EthClient.ForgeBatchGasCost,
 				VerifierIdx:       uint8(verifierIdx),
 				TxProcessorConfig: txProcessorCfg,
 			},
@@ -376,7 +397,7 @@ func NewNode(mode Mode, cfg *config.Node) (*Node, error) {
 	}
 	var debugAPI *debugapi.DebugAPI
 	if cfg.Debug.APIAddress != "" {
-		debugAPI = debugapi.NewDebugAPI(cfg.Debug.APIAddress, historyDB, stateDB, sync)
+		debugAPI = debugapi.NewDebugAPI(cfg.Debug.APIAddress, stateDB, sync)
 	}
 	priceUpdater, err := priceupdater.NewPriceUpdater(cfg.PriceUpdater.URL,
 		priceupdater.APIType(cfg.PriceUpdater.Type), historyDB)
@@ -392,7 +413,8 @@ func NewNode(mode Mode, cfg *config.Node) (*Node, error) {
 		sync:         sync,
 		cfg:          cfg,
 		mode:         mode,
-		sqlConn:      db,
+		sqlConnRead:  dbRead,
+		sqlConnWrite: dbWrite,
 		ctx:          ctx,
 		cancel:       cancel,
 	}, nil
@@ -428,7 +450,6 @@ func NewNodeAPI(
 		coordinatorEndpoints, explorerEndpoints,
 		engine,
 		hdb,
-		sdb,
 		l2db,
 		config,
 	)
@@ -446,16 +467,20 @@ func NewNodeAPI(
 // cancelation.
 func (a *NodeAPI) Run(ctx context.Context) error {
 	server := &http.Server{
-		Addr:    a.addr,
 		Handler: a.engine,
 		// TODO: Figure out best parameters for production
 		ReadTimeout:    30 * time.Second, //nolint:gomnd
 		WriteTimeout:   30 * time.Second, //nolint:gomnd
 		MaxHeaderBytes: 1 << 20,          //nolint:gomnd
 	}
+	listener, err := net.Listen("tcp", a.addr)
+	if err != nil {
+		return tracerr.Wrap(err)
+	}
+	log.Infof("NodeAPI is ready at %v", a.addr)
 	go func() {
-		log.Infof("NodeAPI is ready at %v", a.addr)
-		if err := server.ListenAndServe(); err != nil && tracerr.Unwrap(err) != http.ErrServerClosed {
+		if err := server.Serve(listener); err != nil &&
+			tracerr.Unwrap(err) != http.ErrServerClosed {
 			log.Fatalf("Listen: %s\n", err)
 		}
 	}()
@@ -547,9 +572,6 @@ func (n *Node) syncLoopFn(ctx context.Context, lastBlock *common.Block) (*common
 			WDelayer: blockData.WDelayer.Vars,
 		}
 		n.handleNewBlock(ctx, stats, vars, blockData.Rollup.Batches)
-		if n.debugAPI != nil {
-			n.debugAPI.SyncBlockHook()
-		}
 		return &blockData.Block, time.Duration(0), nil
 	} else {
 		// case: no block
@@ -654,6 +676,10 @@ func (n *Node) StartNodeAPI() {
 
 	n.wg.Add(1)
 	go func() {
+		// Do an initial update on startup
+		if err := n.nodeAPI.api.UpdateMetrics(); err != nil {
+			log.Errorw("API.UpdateMetrics", "err", err)
+		}
 		for {
 			select {
 			case <-n.ctx.Done():
@@ -670,6 +696,10 @@ func (n *Node) StartNodeAPI() {
 
 	n.wg.Add(1)
 	go func() {
+		// Do an initial update on startup
+		if err := n.nodeAPI.api.UpdateRecommendedFee(); err != nil {
+			log.Errorw("API.UpdateRecommendedFee", "err", err)
+		}
 		for {
 			select {
 			case <-n.ctx.Done():

priceupdater/priceupdater_test.go

@@ -20,7 +20,7 @@ func TestPriceUpdater(t *testing.T) {
 	pass := os.Getenv("POSTGRES_PASS")
 	db, err := dbUtils.InitSQLDB(5432, "localhost", "hermez", pass, "hermez")
 	assert.NoError(t, err)
-	historyDB := historydb.NewHistoryDB(db, nil)
+	historyDB := historydb.NewHistoryDB(db, db, nil)
 	// Clean DB
 	test.WipeDB(historyDB.DB())
 	// Populate DB

synchronizer/metrics.go

@@ -0,0 +1,44 @@
+package synchronizer
+
+import "github.com/prometheus/client_golang/prometheus"
+
+var (
+	metricReorgsCount = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Name: "sync_reorgs",
+			Help: "",
+		},
+	)
+	metricSyncedLastBlockNum = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "sync_synced_last_block_num",
+			Help: "",
+		},
+	)
+	metricEthLastBlockNum = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "sync_eth_last_block_num",
+			Help: "",
+		},
+	)
+	metricSyncedLastBatchNum = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "sync_synced_last_batch_num",
+			Help: "",
+		},
+	)
+	metricEthLastBatchNum = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "sync_eth_last_batch_num",
+			Help: "",
+		},
+	)
+)
+
+func init() {
+	prometheus.MustRegister(metricReorgsCount)
+	prometheus.MustRegister(metricSyncedLastBlockNum)
+	prometheus.MustRegister(metricEthLastBlockNum)
+	prometheus.MustRegister(metricSyncedLastBatchNum)
+	prometheus.MustRegister(metricEthLastBatchNum)
+}

synchronizer/synchronizer.go

@@ -662,12 +662,16 @@ func (s *Synchronizer) Sync2(ctx context.Context,
 	}
 
 	for _, batchData := range rollupData.Batches {
+		metricSyncedLastBatchNum.Set(float64(batchData.Batch.BatchNum))
+		metricEthLastBatchNum.Set(float64(s.stats.Eth.LastBatchNum))
 		log.Debugw("Synced batch",
 			"syncLastBatch", batchData.Batch.BatchNum,
 			"syncBatchesPerc", s.stats.batchesPerc(batchData.Batch.BatchNum),
 			"ethLastBatch", s.stats.Eth.LastBatchNum,
 		)
 	}
+	metricSyncedLastBlockNum.Set(float64(s.stats.Sync.LastBlock.Num))
+	metricEthLastBlockNum.Set(float64(s.stats.Eth.LastBlock.Num))
 	log.Debugw("Synced block",
 		"syncLastBlockNum", s.stats.Sync.LastBlock.Num,
 		"syncBlocksPerc", s.stats.blocksPerc(),
@@ -993,6 +997,19 @@ func (s *Synchronizer) rollupSync(ethBlock *common.Block) (*common.RollupData, e
 		}
 		batchData.CreatedAccounts = processTxsOut.CreatedAccounts
 
+		batchData.UpdatedAccounts = make([]common.AccountUpdate, 0,
+			len(processTxsOut.UpdatedAccounts))
+		for _, acc := range processTxsOut.UpdatedAccounts {
+			batchData.UpdatedAccounts = append(batchData.UpdatedAccounts,
+				common.AccountUpdate{
+					EthBlockNum: blockNum,
+					BatchNum:    batchNum,
+					Idx:         acc.Idx,
+					Nonce:       acc.Nonce,
+					Balance:     acc.Balance,
+				})
+		}
+
 		slotNum := int64(0)
 		if ethBlock.Num >= s.consts.Auction.GenesisBlockNum {
 			slotNum = (ethBlock.Num - s.consts.Auction.GenesisBlockNum) /

synchronizer/synchronizer_test.go

@@ -171,6 +171,8 @@ func checkSyncBlock(t *testing.T, s *Synchronizer, blockNum int, block, syncBloc
 			*exit = syncBatch.ExitTree[j]
 		}
 		assert.Equal(t, batch.Batch, syncBatch.Batch)
+		// Ignore updated accounts
+		syncBatch.UpdatedAccounts = nil
 		assert.Equal(t, batch, syncBatch)
 		assert.Equal(t, &batch.Batch, dbBatch) //nolint:gosec
 
@@ -313,7 +315,7 @@ func newTestModules(t *testing.T) (*statedb.StateDB, *historydb.HistoryDB) {
 	pass := os.Getenv("POSTGRES_PASS")
 	db, err := dbUtils.InitSQLDB(5432, "localhost", "hermez", pass, "hermez")
 	require.NoError(t, err)
-	historyDB := historydb.NewHistoryDB(db, nil)
+	historyDB := historydb.NewHistoryDB(db, db, nil)
 	// Clear DB
 	test.WipeDB(historyDB.DB())
 

test/debugapi/debugapi.go

@@ -2,20 +2,18 @@ package debugapi
 
 import (
 	"context"
-	"fmt"
-	"math/big"
+	"net"
 	"net/http"
-	"sync"
 	"time"
 
 	"github.com/gin-contrib/cors"
 	"github.com/gin-gonic/gin"
 	"github.com/hermeznetwork/hermez-node/common"
-	"github.com/hermeznetwork/hermez-node/db/historydb"
 	"github.com/hermeznetwork/hermez-node/db/statedb"
 	"github.com/hermeznetwork/hermez-node/log"
 	"github.com/hermeznetwork/hermez-node/synchronizer"
 	"github.com/hermeznetwork/tracerr"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
 func handleNoRoute(c *gin.Context) {
@@ -35,109 +33,22 @@ func badReq(err error, c *gin.Context) {
 	})
 }
 
-const (
-	statusUpdating = "updating"
-	statusOK       = "ok"
-)
-
-type tokenBalances struct {
-	sync.RWMutex
-	Value struct {
-		Status   string
-		Block    *common.Block
-		Batch    *common.Batch
-		Balances map[common.TokenID]*big.Int
-	}
-}
-
-func (t *tokenBalances) Update(historyDB *historydb.HistoryDB, sdb *statedb.StateDB) (err error) {
-	var block *common.Block
-	var batch *common.Batch
-	var balances map[common.TokenID]*big.Int
-	defer func() {
-		t.Lock()
-		if err == nil {
-			t.Value.Status = statusOK
-			t.Value.Block = block
-			t.Value.Batch = batch
-			t.Value.Balances = balances
-		} else {
-			t.Value.Status = fmt.Sprintf("tokenBalances.Update: %v", err)
-			t.Value.Block = nil
-			t.Value.Batch = nil
-			t.Value.Balances = nil
-		}
-		t.Unlock()
-	}()
-
-	if block, err = historyDB.GetLastBlock(); err != nil {
-		return tracerr.Wrap(err)
-	}
-	if batch, err = historyDB.GetLastBatch(); err != nil {
-		return tracerr.Wrap(err)
-	}
-	balances = make(map[common.TokenID]*big.Int)
-	sdb.LastRead(func(sdbLast *statedb.Last) error {
-		return tracerr.Wrap(
-			statedb.AccountsIter(sdbLast.DB(), func(a *common.Account) (bool, error) {
-				if balance, ok := balances[a.TokenID]; !ok {
-					balances[a.TokenID] = a.Balance
-				} else {
-					balance.Add(balance, a.Balance)
-				}
-				return true, nil
-			}),
-		)
-	})
-	return nil
-}
-
 // DebugAPI is an http API with debugging endpoints
 type DebugAPI struct {
-	addr          string
-	historyDB     *historydb.HistoryDB
-	stateDB       *statedb.StateDB // synchronizer statedb
-	sync          *synchronizer.Synchronizer
-	tokenBalances tokenBalances
+	addr    string
+	stateDB *statedb.StateDB // synchronizer statedb
+	sync    *synchronizer.Synchronizer
 }
 
 // NewDebugAPI creates a new DebugAPI
-func NewDebugAPI(addr string, historyDB *historydb.HistoryDB, stateDB *statedb.StateDB,
-	sync *synchronizer.Synchronizer) *DebugAPI {
+func NewDebugAPI(addr string, stateDB *statedb.StateDB, sync *synchronizer.Synchronizer) *DebugAPI {
 	return &DebugAPI{
-		addr:      addr,
-		historyDB: historyDB,
-		stateDB:   stateDB,
-		sync:      sync,
+		addr:    addr,
+		stateDB: stateDB,
+		sync:    sync,
 	}
 }
 
-// SyncBlockHook is a hook function that the node will call after every new synchronized block
-func (a *DebugAPI) SyncBlockHook() {
-	a.tokenBalances.RLock()
-	updateTokenBalances := a.tokenBalances.Value.Status == statusUpdating
-	a.tokenBalances.RUnlock()
-	if updateTokenBalances {
-		if err := a.tokenBalances.Update(a.historyDB, a.stateDB); err != nil {
-			log.Errorw("DebugAPI.tokenBalances.Upate", "err", err)
-		}
-	}
-}
-
-func (a *DebugAPI) handleTokenBalances(c *gin.Context) {
-	a.tokenBalances.RLock()
-	tokenBalances := a.tokenBalances.Value
-	a.tokenBalances.RUnlock()
-	c.JSON(http.StatusOK, tokenBalances)
-}
-
-func (a *DebugAPI) handlePostTokenBalances(c *gin.Context) {
-	a.tokenBalances.Lock()
-	a.tokenBalances.Value.Status = statusUpdating
-	a.tokenBalances.Unlock()
-	c.JSON(http.StatusOK, nil)
-}
-
 func (a *DebugAPI) handleAccount(c *gin.Context) {
 	uri := struct {
 		Idx uint32
@@ -198,6 +109,8 @@ func (a *DebugAPI) Run(ctx context.Context) error {
 	api.Use(cors.Default())
 	debugAPI := api.Group("/debug")
 
+	debugAPI.GET("/metrics", gin.WrapH(promhttp.Handler()))
+
 	debugAPI.GET("sdb/batchnum", a.handleCurrentBatch)
 	debugAPI.GET("sdb/mtroot", a.handleMTRoot)
 	// Accounts returned by these endpoints will always have BatchNum = 0,
@@ -205,22 +118,24 @@ func (a *DebugAPI) Run(ctx context.Context) error {
 	// is created.
 	debugAPI.GET("sdb/accounts", a.handleAccounts)
 	debugAPI.GET("sdb/accounts/:Idx", a.handleAccount)
-	debugAPI.POST("sdb/tokenbalances", a.handlePostTokenBalances)
-	debugAPI.GET("sdb/tokenbalances", a.handleTokenBalances)
 
 	debugAPI.GET("sync/stats", a.handleSyncStats)
 
 	debugAPIServer := &http.Server{
-		Addr:    a.addr,
 		Handler: api,
-		// Use some hardcoded numberes that are suitable for testing
+		// Use some hardcoded numbers that are suitable for testing
 		ReadTimeout:    30 * time.Second, //nolint:gomnd
 		WriteTimeout:   30 * time.Second, //nolint:gomnd
 		MaxHeaderBytes: 1 << 20,          //nolint:gomnd
 	}
+	listener, err := net.Listen("tcp", a.addr)
+	if err != nil {
+		return tracerr.Wrap(err)
+	}
+	log.Infof("DebugAPI is ready at %v", a.addr)
 	go func() {
-		log.Infof("DebugAPI is ready at %v", a.addr)
-		if err := debugAPIServer.ListenAndServe(); err != nil && tracerr.Unwrap(err) != http.ErrServerClosed {
+		if err := debugAPIServer.Serve(listener); err != nil &&
+			tracerr.Unwrap(err) != http.ErrServerClosed {
 			log.Fatalf("Listen: %s\n", err)
 		}
 	}()

test/debugapi/debugapi_test.go

@@ -6,21 +6,13 @@ import (
 	"io/ioutil"
 	"math/big"
 	"net/http"
-	"os"
 	"strconv"
-	"sync"
 	"testing"
 
 	"github.com/dghubble/sling"
-	ethCommon "github.com/ethereum/go-ethereum/common"
 	ethCrypto "github.com/ethereum/go-ethereum/crypto"
 	"github.com/hermeznetwork/hermez-node/common"
-	dbUtils "github.com/hermeznetwork/hermez-node/db"
-	"github.com/hermeznetwork/hermez-node/db/historydb"
 	"github.com/hermeznetwork/hermez-node/db/statedb"
-	"github.com/hermeznetwork/hermez-node/test"
-	"github.com/hermeznetwork/hermez-node/test/til"
-	"github.com/hermeznetwork/hermez-node/txprocessor"
 	"github.com/iden3/go-iden3-crypto/babyjub"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -59,15 +51,12 @@ func TestDebugAPI(t *testing.T) {
 
 	addr := "localhost:12345"
 	// We won't test the sync/stats endpoint, so we can se the Syncrhonizer to nil
-	debugAPI := NewDebugAPI(addr, nil, sdb, nil)
+	debugAPI := NewDebugAPI(addr, sdb, nil)
 
 	ctx, cancel := context.WithCancel(context.Background())
-	wg := sync.WaitGroup{}
-	wg.Add(1)
 	go func() {
 		err := debugAPI.Run(ctx)
 		require.Nil(t, err)
-		wg.Done()
 	}()
 
 	var accounts []common.Account
@@ -113,130 +102,4 @@ func TestDebugAPI(t *testing.T) {
 	assert.Equal(t, accounts, accountsAPI)
 
 	cancel()
-	wg.Wait()
-}
-
-func TestDebugAPITokenBalances(t *testing.T) {
-	dir, err := ioutil.TempDir("", "tmpdb")
-	require.Nil(t, err)
-
-	sdb, err := statedb.NewStateDB(statedb.Config{Path: dir, Keep: 128, Type: statedb.TypeSynchronizer, NLevels: 32})
-	require.Nil(t, err)
-
-	// Init History DB
-	pass := os.Getenv("POSTGRES_PASS")
-	db, err := dbUtils.InitSQLDB(5432, "localhost", "hermez", pass, "hermez")
-	require.NoError(t, err)
-	historyDB := historydb.NewHistoryDB(db, nil)
-	// Clear DB
-	test.WipeDB(historyDB.DB())
-
-	set := `
-		Type: Blockchain
-
-		AddToken(1)
-		AddToken(2)
-		AddToken(3)
-
-		CreateAccountDeposit(1) A: 1000
-		CreateAccountDeposit(2) A: 2000
-		CreateAccountDeposit(1) B: 100
-		CreateAccountDeposit(2) B: 200
-		CreateAccountDeposit(2) C: 400
-
-		> batchL1 // forge L1UserTxs{nil}, freeze defined L1UserTxs{5}
-		> batchL1 // forge defined L1UserTxs{5}, freeze L1UserTxs{nil}
-		> block // blockNum=2
-	`
-
-	chainID := uint16(0)
-	tc := til.NewContext(chainID, common.RollupConstMaxL1UserTx)
-	tilCfgExtra := til.ConfigExtra{
-		BootCoordAddr: ethCommon.HexToAddress("0xE39fEc6224708f0772D2A74fd3f9055A90E0A9f2"),
-		CoordUser:     "A",
-	}
-	blocks, err := tc.GenerateBlocks(set)
-	require.NoError(t, err)
-
-	err = tc.FillBlocksExtra(blocks, &tilCfgExtra)
-	require.NoError(t, err)
-	tc.FillBlocksL1UserTxsBatchNum(blocks)
-	err = tc.FillBlocksForgedL1UserTxs(blocks)
-	require.NoError(t, err)
-
-	tpc := txprocessor.Config{
-		NLevels:  32,
-		MaxTx:    100,
-		ChainID:  chainID,
-		MaxFeeTx: common.RollupConstMaxFeeIdxCoordinator,
-		MaxL1Tx:  common.RollupConstMaxL1Tx,
-	}
-	tp := txprocessor.NewTxProcessor(sdb, tpc)
-
-	for _, block := range blocks {
-		require.NoError(t, historyDB.AddBlockSCData(&block))
-		for _, batch := range block.Rollup.Batches {
-			_, err := tp.ProcessTxs(batch.Batch.FeeIdxsCoordinator,
-				batch.L1UserTxs, batch.L1CoordinatorTxs, []common.PoolL2Tx{})
-			require.NoError(t, err)
-		}
-	}
-
-	addr := "localhost:12345"
-	// We won't test the sync/stats endpoint, so we can se the Syncrhonizer to nil
-	debugAPI := NewDebugAPI(addr, historyDB, sdb, nil)
-
-	ctx, cancel := context.WithCancel(context.Background())
-	wg := sync.WaitGroup{}
-	wg.Add(1)
-	go func() {
-		err := debugAPI.Run(ctx)
-		require.Nil(t, err)
-		wg.Done()
-	}()
-
-	var accounts []common.Account
-	for i := 0; i < 16; i++ {
-		account := newAccount(t, i)
-		accounts = append(accounts, *account)
-		_, err = sdb.CreateAccount(account.Idx, account)
-		require.Nil(t, err)
-	}
-	// Make a checkpoint (batchNum 2) to make the accounts available in Last
-	err = sdb.MakeCheckpoint()
-	require.Nil(t, err)
-
-	url := fmt.Sprintf("http://%v/debug/", addr)
-
-	var batchNum common.BatchNum
-	req, err := sling.New().Get(url).Path("sdb/batchnum").ReceiveSuccess(&batchNum)
-	require.Equal(t, http.StatusOK, req.StatusCode)
-	require.Nil(t, err)
-	assert.Equal(t, common.BatchNum(2), batchNum)
-
-	var mtroot *big.Int
-	req, err = sling.New().Get(url).Path("sdb/mtroot").ReceiveSuccess(&mtroot)
-	require.Equal(t, http.StatusOK, req.StatusCode)
-	require.Nil(t, err)
-	// Testing against a hardcoded value obtained by running the test and
-	// printing the value previously.
-	assert.Equal(t, "21765339739823365993496282904432398015268846626944509989242908567129545640185",
-		mtroot.String())
-
-	var accountAPI common.Account
-	req, err = sling.New().Get(url).
-		Path(fmt.Sprintf("sdb/accounts/%v", accounts[0].Idx)).
-		ReceiveSuccess(&accountAPI)
-	require.Equal(t, http.StatusOK, req.StatusCode)
-	require.Nil(t, err)
-	assert.Equal(t, accounts[0], accountAPI)
-
-	var accountsAPI []common.Account
-	req, err = sling.New().Get(url).Path("sdb/accounts").ReceiveSuccess(&accountsAPI)
-	require.Equal(t, http.StatusOK, req.StatusCode)
-	require.Nil(t, err)
-	assert.Equal(t, accounts, accountsAPI)
-
-	cancel()
-	wg.Wait()
 }

test/proofserver/proofserver.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"io/ioutil"
+	"net"
 	"net/http"
 	"sync"
 	"time"
@@ -145,7 +146,7 @@ const longWaitDuration = 999 * time.Hour
 // const provingDuration = 2 * time.Second
 
 func (s *Mock) runProver(ctx context.Context) {
-	waitCh := time.After(longWaitDuration)
+	timer := time.NewTimer(longWaitDuration)
 	for {
 		select {
 		case <-ctx.Done():
@@ -153,21 +154,27 @@ func (s *Mock) runProver(ctx context.Context) {
 		case msg := <-s.msgCh:
 			switch msg.value {
 			case "cancel":
-				waitCh = time.After(longWaitDuration)
+				if !timer.Stop() {
+					<-timer.C
+				}
+				timer.Reset(longWaitDuration)
 				s.Lock()
 				if !s.status.IsReady() {
 					s.status = prover.StatusCodeAborted
 				}
 				s.Unlock()
 			case "prove":
-				waitCh = time.After(s.provingDuration)
+				if !timer.Stop() {
+					<-timer.C
+				}
+				timer.Reset(s.provingDuration)
 				s.Lock()
 				s.status = prover.StatusCodeBusy
 				s.Unlock()
 			}
 			msg.ackCh <- true
-		case <-waitCh:
-			waitCh = time.After(longWaitDuration)
+		case <-timer.C:
+			timer.Reset(longWaitDuration)
 			s.Lock()
 			if s.status != prover.StatusCodeBusy {
 				s.Unlock()
@@ -202,16 +209,20 @@ func (s *Mock) Run(ctx context.Context) error {
 	apiGroup.POST("/cancel", s.handleCancel)
 
 	debugAPIServer := &http.Server{
-		Addr:    s.addr,
 		Handler: api,
 		// Use some hardcoded numberes that are suitable for testing
 		ReadTimeout:    30 * time.Second, //nolint:gomnd
 		WriteTimeout:   30 * time.Second, //nolint:gomnd
 		MaxHeaderBytes: 1 << 20,          //nolint:gomnd
 	}
+	listener, err := net.Listen("tcp", s.addr)
+	if err != nil {
+		return tracerr.Wrap(err)
+	}
+	log.Infof("prover.MockServer is ready at %v", s.addr)
 	go func() {
-		log.Infof("prover.MockServer is ready at %v", s.addr)
-		if err := debugAPIServer.ListenAndServe(); err != nil && tracerr.Unwrap(err) != http.ErrServerClosed {
+		if err := debugAPIServer.Serve(listener); err != nil &&
+			tracerr.Unwrap(err) != http.ErrServerClosed {
 			log.Fatalf("Listen: %s\n", err)
 		}
 	}()

test/zkproof/flows_test.go

@@ -38,7 +38,7 @@ func addTokens(t *testing.T, tc *til.Context, db *sqlx.DB) {
 		})
 	}
 
-	hdb := historydb.NewHistoryDB(db, nil)
+	hdb := historydb.NewHistoryDB(db, db, nil)
 	assert.NoError(t, hdb.AddBlock(&common.Block{
 		Num: 1,
 	}))
@@ -75,7 +75,7 @@ func initTxSelector(t *testing.T, chainID uint16, hermezContractAddr ethCommon.A
 	pass := os.Getenv("POSTGRES_PASS")
 	db, err := dbUtils.InitSQLDB(5432, "localhost", "hermez", pass, "hermez")
 	require.NoError(t, err)
-	l2DB := l2db.NewL2DB(db, 10, 100, 24*time.Hour, nil)
+	l2DB := l2db.NewL2DB(db, db, 10, 100, 0.0, 24*time.Hour, nil)
 
 	dir, err := ioutil.TempDir("", "tmpSyncDB")
 	require.NoError(t, err)

txprocessor/txprocessor.go

@@ -27,6 +27,9 @@ type TxProcessor struct {
 	// AccumulatedFees contains the accumulated fees for each token (Coord
 	// Idx) in the processed batch
 	AccumulatedFees map[common.Idx]*big.Int
+	// updatedAccounts stores the last version of the account when it has
+	// been created/updated by any of the processed transactions.
+	updatedAccounts map[common.Idx]*common.Account
 	config          Config
 }
 
@@ -55,6 +58,9 @@ type ProcessTxOutput struct {
 	CreatedAccounts    []common.Account
 	CoordinatorIdxsMap map[common.TokenID]common.Idx
 	CollectedFees      map[common.TokenID]*big.Int
+	// UpdatedAccounts returns the current state of each account
+	// created/updated by any of the processed transactions.
+	UpdatedAccounts map[common.Idx]*common.Account
 }
 
 func newErrorNotEnoughBalance(tx common.Tx) error {
@@ -127,6 +133,10 @@ func (tp *TxProcessor) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinat
 		return nil, tracerr.Wrap(fmt.Errorf("L1UserTx + L1CoordinatorTx (%d) can not be bigger than MaxL1Tx (%d)", len(l1usertxs)+len(l1coordinatortxs), tp.config.MaxTx))
 	}
 
+	if tp.s.Type() == statedb.TypeSynchronizer {
+		tp.updatedAccounts = make(map[common.Idx]*common.Account)
+	}
+
 	exits := make([]processedExit, nTx)
 
 	if tp.s.Type() == statedb.TypeBatchBuilder {
@@ -198,7 +208,7 @@ func (tp *TxProcessor) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinat
 			}
 		}
 		if tp.s.Type() == statedb.TypeSynchronizer || tp.s.Type() == statedb.TypeBatchBuilder {
-			if exitIdx != nil && exitTree != nil {
+			if exitIdx != nil && exitTree != nil && exitAccount != nil {
 				exits[tp.i] = processedExit{
 					exit:    true,
 					newExit: newExit,
@@ -382,7 +392,7 @@ func (tp *TxProcessor) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinat
 			tp.zki.EthAddr3[iFee] = common.EthAddrToBigInt(accCoord.EthAddr)
 		}
 		accCoord.Balance = new(big.Int).Add(accCoord.Balance, accumulatedFee)
-		pFee, err := tp.s.UpdateAccount(idx, accCoord)
+		pFee, err := tp.updateAccount(idx, accCoord)
 		if err != nil {
 			log.Error(err)
 			return nil, tracerr.Wrap(err)
@@ -407,39 +417,39 @@ func (tp *TxProcessor) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinat
 		return nil, nil
 	}
 
-	// once all txs processed (exitTree root frozen), for each Exit,
-	// generate common.ExitInfo data
-	var exitInfos []common.ExitInfo
-	exitInfosByIdx := make(map[common.Idx]*common.ExitInfo)
-	for i := 0; i < nTx; i++ {
-		if !exits[i].exit {
-			continue
-		}
-		exitIdx := exits[i].idx
-		exitAccount := exits[i].acc
-
-		// 0. generate MerkleProof
-		p, err := exitTree.GenerateSCVerifierProof(exitIdx.BigInt(), nil)
-		if err != nil {
-			return nil, tracerr.Wrap(err)
-		}
-
-		// 1. generate common.ExitInfo
-		ei := common.ExitInfo{
-			AccountIdx:  exitIdx,
-			MerkleProof: p,
-			Balance:     exitAccount.Balance,
-		}
-		if prevExit, ok := exitInfosByIdx[exitIdx]; !ok {
-			exitInfos = append(exitInfos, ei)
-			exitInfosByIdx[exitIdx] = &exitInfos[len(exitInfos)-1]
-		} else {
-			*prevExit = ei
-		}
-	}
-
 	if tp.s.Type() == statedb.TypeSynchronizer {
-		// retuTypeexitInfos, createdAccounts and collectedFees, so Synchronizer will
+		// once all txs processed (exitTree root frozen), for each Exit,
+		// generate common.ExitInfo data
+		var exitInfos []common.ExitInfo
+		exitInfosByIdx := make(map[common.Idx]*common.ExitInfo)
+		for i := 0; i < nTx; i++ {
+			if !exits[i].exit {
+				continue
+			}
+			exitIdx := exits[i].idx
+			exitAccount := exits[i].acc
+
+			// 0. generate MerkleProof
+			p, err := exitTree.GenerateSCVerifierProof(exitIdx.BigInt(), nil)
+			if err != nil {
+				return nil, tracerr.Wrap(err)
+			}
+
+			// 1. generate common.ExitInfo
+			ei := common.ExitInfo{
+				AccountIdx:  exitIdx,
+				MerkleProof: p,
+				Balance:     exitAccount.Balance,
+			}
+			if prevExit, ok := exitInfosByIdx[exitIdx]; !ok {
+				exitInfos = append(exitInfos, ei)
+				exitInfosByIdx[exitIdx] = &exitInfos[len(exitInfos)-1]
+			} else {
+				*prevExit = ei
+			}
+		}
+
+		// retun exitInfos, createdAccounts and collectedFees, so Synchronizer will
 		// be able to store it into HistoryDB for the concrete BatchNum
 		return &ProcessTxOutput{
 			ZKInputs:           nil,
@@ -447,6 +457,7 @@ func (tp *TxProcessor) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinat
 			CreatedAccounts:    createdAccounts,
 			CoordinatorIdxsMap: coordIdxsMap,
 			CollectedFees:      collectedFees,
+			UpdatedAccounts:    tp.updatedAccounts,
 		}, nil
 	}
 
@@ -594,7 +605,7 @@ func (tp *TxProcessor) ProcessL1Tx(exitTree *merkletree.MerkleTree, tx *common.L
 
 		// execute exit flow
 		// coordIdxsMap is 'nil', as at L1Txs there is no L2 fees
-		exitAccount, newExit, err := tp.applyExit(nil, nil, exitTree, tx.Tx())
+		exitAccount, newExit, err := tp.applyExit(nil, nil, exitTree, tx.Tx(), tx.Amount)
 		if err != nil {
 			log.Error(err)
 			return nil, nil, false, nil, tracerr.Wrap(err)
@@ -719,7 +730,7 @@ func (tp *TxProcessor) ProcessL2Tx(coordIdxsMap map[common.TokenID]common.Idx,
 		}
 	case common.TxTypeExit:
 		// execute exit flow
-		exitAccount, newExit, err := tp.applyExit(coordIdxsMap, collectedFees, exitTree, tx.Tx())
+		exitAccount, newExit, err := tp.applyExit(coordIdxsMap, collectedFees, exitTree, tx.Tx(), tx.Amount)
 		if err != nil {
 			log.Error(err)
 			return nil, nil, false, tracerr.Wrap(err)
@@ -741,7 +752,7 @@ func (tp *TxProcessor) applyCreateAccount(tx *common.L1Tx) error {
 		EthAddr: tx.FromEthAddr,
 	}
 
-	p, err := tp.s.CreateAccount(common.Idx(tp.s.CurrentIdx()+1), account)
+	p, err := tp.createAccount(common.Idx(tp.s.CurrentIdx()+1), account)
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
@@ -776,6 +787,28 @@ func (tp *TxProcessor) applyCreateAccount(tx *common.L1Tx) error {
 	return tp.s.SetCurrentIdx(tp.s.CurrentIdx() + 1)
 }
 
+// createAccount is a wrapper over the StateDB.CreateAccount method that also
+// stores the created account in the updatedAccounts map in case the StateDB is
+// of TypeSynchronizer
+func (tp *TxProcessor) createAccount(idx common.Idx, account *common.Account) (*merkletree.CircomProcessorProof, error) {
+	if tp.s.Type() == statedb.TypeSynchronizer {
+		account.Idx = idx
+		tp.updatedAccounts[idx] = account
+	}
+	return tp.s.CreateAccount(idx, account)
+}
+
+// updateAccount is a wrapper over the StateDB.UpdateAccount method that also
+// stores the updated account in the updatedAccounts map in case the StateDB is
+// of TypeSynchronizer
+func (tp *TxProcessor) updateAccount(idx common.Idx, account *common.Account) (*merkletree.CircomProcessorProof, error) {
+	if tp.s.Type() == statedb.TypeSynchronizer {
+		account.Idx = idx
+		tp.updatedAccounts[idx] = account
+	}
+	return tp.s.UpdateAccount(idx, account)
+}
+
 // applyDeposit updates the balance in the account of the depositer, if
 // andTransfer parameter is set to true, the method will also apply the
 // Transfer of the L1Tx/DepositTransfer
@@ -806,7 +839,7 @@ func (tp *TxProcessor) applyDeposit(tx *common.L1Tx, transfer bool) error {
 	}
 
 	// update sender account in localStateDB
-	p, err := tp.s.UpdateAccount(tx.FromIdx, accSender)
+	p, err := tp.updateAccount(tx.FromIdx, accSender)
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
@@ -843,7 +876,7 @@ func (tp *TxProcessor) applyDeposit(tx *common.L1Tx, transfer bool) error {
 		accReceiver.Balance = new(big.Int).Add(accReceiver.Balance, tx.EffectiveAmount)
 
 		// update receiver account in localStateDB
-		p, err := tp.s.UpdateAccount(tx.ToIdx, accReceiver)
+		p, err := tp.updateAccount(tx.ToIdx, accReceiver)
 		if err != nil {
 			return tracerr.Wrap(err)
 		}
@@ -926,7 +959,7 @@ func (tp *TxProcessor) applyTransfer(coordIdxsMap map[common.TokenID]common.Idx,
 	}
 
 	// update sender account in localStateDB
-	pSender, err := tp.s.UpdateAccount(tx.FromIdx, accSender)
+	pSender, err := tp.updateAccount(tx.FromIdx, accSender)
 	if err != nil {
 		log.Error(err)
 		return tracerr.Wrap(err)
@@ -965,7 +998,7 @@ func (tp *TxProcessor) applyTransfer(coordIdxsMap map[common.TokenID]common.Idx,
 	accReceiver.Balance = new(big.Int).Add(accReceiver.Balance, tx.Amount)
 
 	// update receiver account in localStateDB
-	pReceiver, err := tp.s.UpdateAccount(auxToIdx, accReceiver)
+	pReceiver, err := tp.updateAccount(auxToIdx, accReceiver)
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
@@ -1008,7 +1041,7 @@ func (tp *TxProcessor) applyCreateAccountDepositTransfer(tx *common.L1Tx) error
 	}
 
 	// create Account of the Sender
-	p, err := tp.s.CreateAccount(common.Idx(tp.s.CurrentIdx()+1), accSender)
+	p, err := tp.createAccount(common.Idx(tp.s.CurrentIdx()+1), accSender)
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
@@ -1056,7 +1089,7 @@ func (tp *TxProcessor) applyCreateAccountDepositTransfer(tx *common.L1Tx) error
 	accReceiver.Balance = new(big.Int).Add(accReceiver.Balance, tx.EffectiveAmount)
 
 	// update receiver account in localStateDB
-	p, err = tp.s.UpdateAccount(tx.ToIdx, accReceiver)
+	p, err = tp.updateAccount(tx.ToIdx, accReceiver)
 	if err != nil {
 		return tracerr.Wrap(err)
 	}
@@ -1071,7 +1104,7 @@ func (tp *TxProcessor) applyCreateAccountDepositTransfer(tx *common.L1Tx) error
 // new Leaf in the ExitTree.
 func (tp *TxProcessor) applyExit(coordIdxsMap map[common.TokenID]common.Idx,
 	collectedFees map[common.TokenID]*big.Int, exitTree *merkletree.MerkleTree,
-	tx common.Tx) (*common.Account, bool, error) {
+	tx common.Tx, originalAmount *big.Int) (*common.Account, bool, error) {
 	// 0. subtract tx.Amount from current Account in StateMT
 	// add the tx.Amount into the Account (tx.FromIdx) in the ExitMT
 	acc, err := tp.s.GetAccount(tx.FromIdx)
@@ -1130,7 +1163,7 @@ func (tp *TxProcessor) applyExit(coordIdxsMap map[common.TokenID]common.Idx,
 		}
 	}
 
-	p, err := tp.s.UpdateAccount(tx.FromIdx, acc)
+	p, err := tp.updateAccount(tx.FromIdx, acc)
 	if err != nil {
 		return nil, false, tracerr.Wrap(err)
 	}
@@ -1141,6 +1174,21 @@ func (tp *TxProcessor) applyExit(coordIdxsMap map[common.TokenID]common.Idx,
 	if exitTree == nil {
 		return nil, false, nil
 	}
+
+	// Do not add the Exit when Amount=0, not EffectiveAmount=0. In
+	// txprocessor.applyExit function, the tx.Amount is in reality the
+	// EffectiveAmount, that's why is used here the originalAmount
+	// parameter, which contains the real value of the tx.Amount (not
+	// tx.EffectiveAmount).  This is a particularity of the approach of the
+	// circuit, the idea will be in the future to update the circuit and
+	// when Amount>0 but EffectiveAmount=0, to not add the Exit in the
+	// Exits MerkleTree, but for the moment the Go code is adapted to the
+	// circuit.
+	if originalAmount.Cmp(big.NewInt(0)) == 0 { // Amount == 0
+		// if the Exit Amount==0, the Exit is not added to the ExitTree
+		return nil, false, nil
+	}
+
 	exitAccount, err := statedb.GetAccountInTreeDB(exitTree.DB(), tx.FromIdx)
 	if tracerr.Unwrap(err) == db.ErrNotFound {
 		// 1a. if idx does not exist in exitTree:
@@ -1149,6 +1197,8 @@ func (tp *TxProcessor) applyExit(coordIdxsMap map[common.TokenID]common.Idx,
 		exitAccount := &common.Account{
 			TokenID: acc.TokenID,
 			Nonce:   common.Nonce(0),
+			// as is a common.Tx, the Amount is already an
+			// EffectiveAmount
 			Balance: tx.Amount,
 			BJJ:     acc.BJJ,
 			EthAddr: acc.EthAddr,
@@ -1162,6 +1212,8 @@ func (tp *TxProcessor) applyExit(coordIdxsMap map[common.TokenID]common.Idx,
 				tp.zki.Sign2[tp.i] = big.NewInt(1)
 			}
 			tp.zki.Ay2[tp.i] = accBJJY
+			// as is a common.Tx, the Amount is already an
+			// EffectiveAmount
 			tp.zki.Balance2[tp.i] = tx.Amount
 			tp.zki.EthAddr2[tp.i] = common.EthAddrToBigInt(acc.EthAddr)
 			// as Leaf didn't exist in the ExitTree, set NewExit[i]=1

txprocessor/txprocessor_test.go

@@ -4,6 +4,7 @@ import (
 	"io/ioutil"
 	"math/big"
 	"os"
+	"sort"
 	"testing"
 
 	ethCommon "github.com/ethereum/go-ethereum/common"
@@ -911,3 +912,198 @@ func TestTwoExits(t *testing.T) {
 
 	assert.Equal(t, ptOuts[3].ExitInfos[0].MerkleProof, ptOuts2[3].ExitInfos[0].MerkleProof)
 }
+
+func TestExitOf0Amount(t *testing.T) {
+	// Test to check that when doing an Exit with amount 0 the Exit Root
+	// does not change (as there is no new Exit Leaf created)
+
+	dir, err := ioutil.TempDir("", "tmpdb")
+	require.NoError(t, err)
+	defer assert.NoError(t, os.RemoveAll(dir))
+
+	sdb, err := statedb.NewStateDB(statedb.Config{Path: dir, Keep: 128,
+		Type: statedb.TypeBatchBuilder, NLevels: 32})
+	assert.NoError(t, err)
+
+	chainID := uint16(1)
+
+	tc := til.NewContext(chainID, common.RollupConstMaxL1UserTx)
+
+	set := `
+		Type: Blockchain
+
+		CreateAccountDeposit(0) A: 100
+		CreateAccountDeposit(0) B: 100
+
+		> batchL1 // batch1: freeze L1User{2}
+		> batchL1 // batch2: forge L1User{2}
+
+		ForceExit(0) A: 10
+		ForceExit(0) B: 0
+
+		> batchL1 // batch3: freeze L1User{2}
+		> batchL1 // batch4: forge L1User{2}
+
+		ForceExit(0) A: 10
+
+		> batchL1 // batch5: freeze L1User{1}
+		> batchL1 // batch6: forge L1User{1}
+
+		ForceExit(0) A: 0
+		> batchL1 // batch7: freeze L1User{1}
+		> batchL1 // batch8: forge L1User{1}
+		> block
+	`
+	blocks, err := tc.GenerateBlocks(set)
+	require.NoError(t, err)
+	err = tc.FillBlocksExtra(blocks, &til.ConfigExtra{})
+	require.NoError(t, err)
+	err = tc.FillBlocksForgedL1UserTxs(blocks)
+	require.NoError(t, err)
+
+	// Sanity check
+	require.Equal(t, 2, len(blocks[0].Rollup.Batches[1].L1UserTxs))
+	require.Equal(t, 2, len(blocks[0].Rollup.Batches[3].L1UserTxs))
+	require.Equal(t, big.NewInt(10), blocks[0].Rollup.Batches[3].L1UserTxs[0].Amount)
+	require.Equal(t, big.NewInt(0), blocks[0].Rollup.Batches[3].L1UserTxs[1].Amount)
+
+	config := Config{
+		NLevels:  32,
+		MaxFeeTx: 64,
+		MaxTx:    512,
+		MaxL1Tx:  16,
+		ChainID:  chainID,
+	}
+	tp := NewTxProcessor(sdb, config)
+
+	// For this test are only processed the batches with transactions:
+	// - Batch2, equivalent to Batches[1]
+	// - Batch4, equivalent to Batches[3]
+	// - Batch6, equivalent to Batches[5]
+	// - Batch8, equivalent to Batches[7]
+
+	// process Batch2:
+	_, err = tp.ProcessTxs(nil, blocks[0].Rollup.Batches[1].L1UserTxs, nil, nil)
+	require.NoError(t, err)
+	// process Batch4:
+	ptOut, err := tp.ProcessTxs(nil, blocks[0].Rollup.Batches[3].L1UserTxs, nil, nil)
+	require.NoError(t, err)
+	assert.Equal(t, "14329759303391468223438874789317921522067594445474390443816827472846339238908", ptOut.ZKInputs.Metadata.NewExitRootRaw.BigInt().String())
+	exitRootBatch4 := ptOut.ZKInputs.Metadata.NewExitRootRaw.BigInt().String()
+
+	// process Batch6:
+	ptOut, err = tp.ProcessTxs(nil, blocks[0].Rollup.Batches[5].L1UserTxs, nil, nil)
+	require.NoError(t, err)
+	assert.Equal(t, "14329759303391468223438874789317921522067594445474390443816827472846339238908", ptOut.ZKInputs.Metadata.NewExitRootRaw.BigInt().String())
+	// Expect that the ExitRoot for the Batch6 will be equal than for the
+	// Batch4, as the Batch4 & Batch6 have the same tx with Exit Amount=10,
+	// and Batch4 has a 2nd tx with Exit Amount=0.
+	assert.Equal(t, exitRootBatch4, ptOut.ZKInputs.Metadata.NewExitRootRaw.BigInt().String())
+
+	// For the Batch8, as there is only 1 exit with Amount=0, the ExitRoot
+	// should be 0.
+	// process Batch8:
+	ptOut, err = tp.ProcessTxs(nil, blocks[0].Rollup.Batches[7].L1UserTxs, nil, nil)
+	require.NoError(t, err)
+	assert.Equal(t, "0", ptOut.ZKInputs.Metadata.NewExitRootRaw.BigInt().String())
+}
+
+func TestUpdatedAccounts(t *testing.T) {
+	dir, err := ioutil.TempDir("", "tmpdb")
+	require.NoError(t, err)
+	defer assert.NoError(t, os.RemoveAll(dir))
+
+	sdb, err := statedb.NewStateDB(statedb.Config{Path: dir, Keep: 128,
+		Type: statedb.TypeSynchronizer, NLevels: 32})
+	assert.NoError(t, err)
+
+	set := `
+		Type: Blockchain
+		AddToken(1)
+		CreateAccountCoordinator(0) Coord // 256
+		CreateAccountCoordinator(1) Coord // 257
+		> batch // 1
+		CreateAccountDeposit(0) A: 50 // 258
+		CreateAccountDeposit(0) B: 60 // 259
+		CreateAccountDeposit(1) A: 70 // 260
+		CreateAccountDeposit(1) B: 80 // 261
+		> batchL1 // 2
+		> batchL1 // 3
+		Transfer(0) A-B: 5 (126)
+		> batch // 4
+		Exit(1) B: 5 (126)
+		> batch // 5
+		> block
+	`
+
+	chainID := uint16(0)
+	tc := til.NewContext(chainID, common.RollupConstMaxL1UserTx)
+	blocks, err := tc.GenerateBlocks(set)
+	require.NoError(t, err)
+	tilCfgExtra := til.ConfigExtra{
+		BootCoordAddr: ethCommon.HexToAddress("0xE39fEc6224708f0772D2A74fd3f9055A90E0A9f2"),
+		CoordUser:     "Coord",
+	}
+	err = tc.FillBlocksExtra(blocks, &tilCfgExtra)
+	require.NoError(t, err)
+	tc.FillBlocksL1UserTxsBatchNum(blocks)
+	err = tc.FillBlocksForgedL1UserTxs(blocks)
+	require.NoError(t, err)
+
+	require.Equal(t, 5, len(blocks[0].Rollup.Batches))
+
+	config := Config{
+		NLevels:  32,
+		MaxFeeTx: 64,
+		MaxTx:    512,
+		MaxL1Tx:  16,
+		ChainID:  chainID,
+	}
+	tp := NewTxProcessor(sdb, config)
+
+	sortedKeys := func(m map[common.Idx]*common.Account) []int {
+		keys := make([]int, 0)
+		for k := range m {
+			keys = append(keys, int(k))
+		}
+		sort.Ints(keys)
+		return keys
+	}
+
+	for _, batch := range blocks[0].Rollup.Batches {
+		l2Txs := common.L2TxsToPoolL2Txs(batch.L2Txs)
+		ptOut, err := tp.ProcessTxs(batch.Batch.FeeIdxsCoordinator, batch.L1UserTxs,
+			batch.L1CoordinatorTxs, l2Txs)
+		require.NoError(t, err)
+		switch batch.Batch.BatchNum {
+		case 1:
+			assert.Equal(t, 2, len(ptOut.UpdatedAccounts))
+			assert.Equal(t, []int{256, 257}, sortedKeys(ptOut.UpdatedAccounts))
+		case 2:
+			assert.Equal(t, 0, len(ptOut.UpdatedAccounts))
+			assert.Equal(t, []int{}, sortedKeys(ptOut.UpdatedAccounts))
+		case 3:
+			assert.Equal(t, 4, len(ptOut.UpdatedAccounts))
+			assert.Equal(t, []int{258, 259, 260, 261}, sortedKeys(ptOut.UpdatedAccounts))
+		case 4:
+			assert.Equal(t, 2+1, len(ptOut.UpdatedAccounts))
+			assert.Equal(t, []int{256, 258, 259}, sortedKeys(ptOut.UpdatedAccounts))
+		case 5:
+			assert.Equal(t, 1+1, len(ptOut.UpdatedAccounts))
+			assert.Equal(t, []int{257, 261}, sortedKeys(ptOut.UpdatedAccounts))
+		}
+		for idx, updAcc := range ptOut.UpdatedAccounts {
+			acc, err := sdb.GetAccount(idx)
+			require.NoError(t, err)
+			// If acc.Balance is 0, set it to 0 with big.NewInt so
+			// that the comparison succeeds.  Without this, the
+			// comparison will not succeed because acc.Balance is
+			// set from a slice, and thus the internal big.Int
+			// buffer is not nil (big.Int.abs)
+			if acc.Balance.BitLen() == 0 {
+				acc.Balance = big.NewInt(0)
+			}
+			assert.Equal(t, acc, updAcc)
+		}
+	}
+}

txselector/metrics.go

@@ -0,0 +1,53 @@
+package txselector
+
+import "github.com/prometheus/client_golang/prometheus"
+
+var (
+	metricGetL2TxSelection = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Name: "txsel_get_l2_txselecton_total",
+			Help: "",
+		},
+	)
+	metricGetL1L2TxSelection = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Name: "txsel_get_l1_l2_txselecton_total",
+			Help: "",
+		},
+	)
+
+	metricSelectedL1CoordinatorTxs = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "txsel_selected_l1_coordinator_txs",
+			Help: "",
+		},
+	)
+	metricSelectedL1UserTxs = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "txsel_selected_l1_user_txs",
+			Help: "",
+		},
+	)
+	metricSelectedL2Txs = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "txsel_selected_l2_txs",
+			Help: "",
+		},
+	)
+	metricDiscardedL2Txs = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "txsel_discarded_l2_txs",
+			Help: "",
+		},
+	)
+)
+
+func init() {
+	prometheus.MustRegister(metricGetL2TxSelection)
+	prometheus.MustRegister(metricGetL1L2TxSelection)
+
+	prometheus.MustRegister(metricSelectedL1CoordinatorTxs)
+	prometheus.MustRegister(metricSelectedL1UserTxs)
+	prometheus.MustRegister(metricSelectedL2Txs)
+	prometheus.MustRegister(metricDiscardedL2Txs)
+}

txselector/txselector.go

@@ -18,20 +18,6 @@ import (
 	"github.com/iden3/go-iden3-crypto/babyjub"
 )
 
-// txs implements the interface Sort for an array of Tx, and sorts the txs by
-// absolute fee
-type txs []common.PoolL2Tx
-
-func (t txs) Len() int {
-	return len(t)
-}
-func (t txs) Swap(i, j int) {
-	t[i], t[j] = t[j], t[i]
-}
-func (t txs) Less(i, j int) bool {
-	return t[i].AbsoluteFee > t[j].AbsoluteFee
-}
-
 // CoordAccount contains the data of the Coordinator account, that will be used
 // to create new transactions of CreateAccountDeposit type to add new TokenID
 // accounts for the Coordinator to receive the fees.
@@ -147,9 +133,11 @@ func (txsel *TxSelector) coordAccountForTokenID(l1CoordinatorTxs []common.L1Tx,
 // included in the next batch.
 func (txsel *TxSelector) GetL2TxSelection(selectionConfig *SelectionConfig) ([]common.Idx,
 	[][]byte, []common.L1Tx, []common.PoolL2Tx, []common.PoolL2Tx, error) {
-	coordIdxs, accCreationAuths, _, l1CoordinatorTxs, l2Txs, discardedL2Txs, err :=
-		txsel.GetL1L2TxSelection(selectionConfig, []common.L1Tx{})
-	return coordIdxs, accCreationAuths, l1CoordinatorTxs, l2Txs, discardedL2Txs, tracerr.Wrap(err)
+	metricGetL2TxSelection.Inc()
+	coordIdxs, accCreationAuths, _, l1CoordinatorTxs, l2Txs,
+		discardedL2Txs, err := txsel.getL1L2TxSelection(selectionConfig, []common.L1Tx{})
+	return coordIdxs, accCreationAuths, l1CoordinatorTxs, l2Txs,
+		discardedL2Txs, tracerr.Wrap(err)
 }
 
 // GetL1L2TxSelection returns the selection of L1 + L2 txs.
@@ -161,6 +149,16 @@ func (txsel *TxSelector) GetL2TxSelection(selectionConfig *SelectionConfig) ([]c
 // creation exists. The L1UserTxs, L1CoordinatorTxs, PoolL2Txs that will be
 // included in the next batch.
 func (txsel *TxSelector) GetL1L2TxSelection(selectionConfig *SelectionConfig,
+	l1UserTxs []common.L1Tx) ([]common.Idx, [][]byte, []common.L1Tx,
+	[]common.L1Tx, []common.PoolL2Tx, []common.PoolL2Tx, error) {
+	metricGetL1L2TxSelection.Inc()
+	coordIdxs, accCreationAuths, l1UserTxs, l1CoordinatorTxs, l2Txs,
+		discardedL2Txs, err := txsel.getL1L2TxSelection(selectionConfig, l1UserTxs)
+	return coordIdxs, accCreationAuths, l1UserTxs, l1CoordinatorTxs, l2Txs,
+		discardedL2Txs, tracerr.Wrap(err)
+}
+
+func (txsel *TxSelector) getL1L2TxSelection(selectionConfig *SelectionConfig,
 	l1UserTxs []common.L1Tx) ([]common.Idx, [][]byte, []common.L1Tx,
 	[]common.L1Tx, []common.PoolL2Tx, []common.PoolL2Tx, error) {
 	// WIP.0: the TxSelector is not optimized and will need a redesign. The
@@ -191,14 +189,16 @@ func (txsel *TxSelector) GetL1L2TxSelection(selectionConfig *SelectionConfig,
 	}
 
 	// discardedL2Txs contains an array of the L2Txs that have not been selected in this Batch
-	var discardedL2Txs []common.PoolL2Tx
 
 	var l1CoordinatorTxs []common.L1Tx
 	positionL1 := len(l1UserTxs)
 	var accAuths [][]byte
 
 	// sort l2TxsRaw (cropping at MaxTx at this point)
-	l2Txs0 := txsel.getL2Profitable(l2TxsRaw, selectionConfig.TxProcessorConfig.MaxTx)
+	l2Txs0, discardedL2Txs := txsel.getL2Profitable(l2TxsRaw, selectionConfig.TxProcessorConfig.MaxTx)
+	for i := range discardedL2Txs {
+		discardedL2Txs[i].Info = "Tx not selected due to low absolute fee"
+	}
 
 	noncesMap := make(map[common.Idx]common.Nonce)
 	var l2Txs []common.PoolL2Tx
@@ -464,6 +464,11 @@ func (txsel *TxSelector) GetL1L2TxSelection(selectionConfig *SelectionConfig,
 		return nil, nil, nil, nil, nil, nil, tracerr.Wrap(err)
 	}
 
+	metricSelectedL1CoordinatorTxs.Set(float64(len(l1CoordinatorTxs)))
+	metricSelectedL1UserTxs.Set(float64(len(l1UserTxs)))
+	metricSelectedL2Txs.Set(float64(len(finalL2Txs)))
+	metricDiscardedL2Txs.Set(float64(len(discardedL2Txs)))
+
 	return coordIdxs, accAuths, l1UserTxs, l1CoordinatorTxs, finalL2Txs, discardedL2Txs, nil
 }
 
@@ -590,11 +595,22 @@ func checkAlreadyPendingToCreate(l1CoordinatorTxs []common.L1Tx, tokenID common.
 }
 
 // getL2Profitable returns the profitable selection of L2Txssorted by Nonce
-func (txsel *TxSelector) getL2Profitable(l2Txs []common.PoolL2Tx, max uint32) []common.PoolL2Tx {
-	// Sort by absolute fee
-	sort.Sort(txs(l2Txs))
+func (txsel *TxSelector) getL2Profitable(l2Txs []common.PoolL2Tx, max uint32) ([]common.PoolL2Tx,
+	[]common.PoolL2Tx) {
+	// First sort by nonce so that txs from the same account are sorted so
+	// that they could be applied in succession.
+	sort.Slice(l2Txs, func(i, j int) bool {
+		return l2Txs[i].Nonce < l2Txs[j].Nonce
+	})
+	// Sort by absolute fee with SliceStable, so that txs with same
+	// AbsoluteFee are not rearranged and nonce order is kept in such case
+	sort.SliceStable(l2Txs, func(i, j int) bool {
+		return l2Txs[i].AbsoluteFee > l2Txs[j].AbsoluteFee
+	})
 
+	discardedL2Txs := []common.PoolL2Tx{}
 	if len(l2Txs) > int(max) {
+		discardedL2Txs = l2Txs[max:]
 		l2Txs = l2Txs[:max]
 	}
 
@@ -603,9 +619,9 @@ func (txsel *TxSelector) getL2Profitable(l2Txs []common.PoolL2Tx, max uint32) []
 	// Account is sorted, but the l2Txs can not be grouped by sender Account
 	// neither by Fee. This is because later on the Nonces will need to be
 	// sequential for the zkproof generation.
-	sort.SliceStable(l2Txs, func(i, j int) bool {
+	sort.Slice(l2Txs, func(i, j int) bool {
 		return l2Txs[i].Nonce < l2Txs[j].Nonce
 	})
 
-	return l2Txs
+	return l2Txs, discardedL2Txs
 }

txselector/txselector_test.go

@@ -29,7 +29,7 @@ func initTest(t *testing.T, chainID uint16, hermezContractAddr ethCommon.Address
 	pass := os.Getenv("POSTGRES_PASS")
 	db, err := dbUtils.InitSQLDB(5432, "localhost", "hermez", pass, "hermez")
 	require.NoError(t, err)
-	l2DB := l2db.NewL2DB(db, 10, 100, 24*time.Hour, nil)
+	l2DB := l2db.NewL2DB(db, db, 10, 100, 0.0, 24*time.Hour, nil)
 
 	dir, err := ioutil.TempDir("", "tmpdb")
 	require.NoError(t, err)
@@ -106,7 +106,7 @@ func addTokens(t *testing.T, tc *til.Context, db *sqlx.DB) {
 		})
 	}
 
-	hdb := historydb.NewHistoryDB(db, nil)
+	hdb := historydb.NewHistoryDB(db, db, nil)
 	assert.NoError(t, hdb.AddBlock(&common.Block{
 		Num: 1,
 	}))
@@ -658,7 +658,7 @@ func TestTransferManyFromSameAccount(t *testing.T) {
 	tpc := txprocessor.Config{
 		NLevels:  16,
 		MaxFeeTx: 10,
-		MaxTx:    20,
+		MaxTx:    10,
 		MaxL1Tx:  10,
 		ChainID:  chainID,
 	}
@@ -683,13 +683,17 @@ func TestTransferManyFromSameAccount(t *testing.T) {
 	PoolTransfer(0) A-B: 10 (126) // 6
 	PoolTransfer(0) A-B: 10 (126) // 7
 	PoolTransfer(0) A-B: 10 (126) // 8
+	PoolTransfer(0) A-B: 10 (126) // 9
+	PoolTransfer(0) A-B: 10 (126) // 10
+	PoolTransfer(0) A-B: 10 (126) // 11
 	`
 	poolL2Txs, err := tc.GeneratePoolL2Txs(batchPoolL2)
 	require.NoError(t, err)
+	require.Equal(t, 11, len(poolL2Txs))
 
 	// reorder poolL2Txs so that nonces are not sorted
 	poolL2Txs[0], poolL2Txs[7] = poolL2Txs[7], poolL2Txs[0]
-	poolL2Txs[1], poolL2Txs[6] = poolL2Txs[6], poolL2Txs[1]
+	poolL2Txs[1], poolL2Txs[10] = poolL2Txs[10], poolL2Txs[1]
 
 	// add the PoolL2Txs to the l2DB
 	addL2Txs(t, txsel, poolL2Txs)
@@ -699,8 +703,9 @@ func TestTransferManyFromSameAccount(t *testing.T) {
 	require.NoError(t, err)
 	assert.Equal(t, 3, len(oL1UserTxs))
 	require.Equal(t, 0, len(oL1CoordTxs))
-	assert.Equal(t, 8, len(oL2Txs))
-	assert.Equal(t, 0, len(discardedL2Txs))
+	assert.Equal(t, 7, len(oL2Txs))
+	assert.Equal(t, 1, len(discardedL2Txs))
+
 	err = txsel.l2db.StartForging(common.TxIDsFromPoolL2Txs(oL2Txs), txsel.localAccountsDB.CurrentBatch())
 	require.NoError(t, err)
 }