@@ -1,3 +1,6 @@
+[Debug]
+APIAddress = "localhost:12345"
+
 [StateDB]
 Path = "/tmp/iden3-test/hermez/statedb"
 

@@ -84,6 +84,9 @@ GasPriceDiv         uint64   `validate:"required"`
 		ReceiptTimeout      Duration `validate:"required"`
 		IntervalReceiptLoop Duration `validate:"required"`
 	} `validate:"required"`
+	Debug struct {
+		APIAddress string
+	}
 }
 
 // Load loads a generic config.

@@ -48,8 +48,6 @@ PrefixKeyAddrBJJ = []byte("ab:")
 )
 
 const (
-	// PathStateDB defines the subpath of the StateDB
-	PathStateDB = "/statedb"
 	// PathBatchNum defines the subpath of the Batch Checkpoint in the
 	// subpath of the StateDB
 	PathBatchNum = "/BatchNum"
@@ -88,7 +86,7 @@ // storage
 func NewStateDB(path string, typ TypeStateDB, nLevels int) (*StateDB, error) {
 	var sto *pebble.PebbleStorage
 	var err error
-	sto, err = pebble.NewPebbleStorage(path+PathStateDB+PathCurrent, false)
+	sto, err = pebble.NewPebbleStorage(path+PathCurrent, false)
 	if err != nil {
 		return nil, err
 	}
@@ -105,7 +103,7 @@ return nil, fmt.Errorf("invalid StateDB parameters: StateDB type==TypeStateDB can not have nLevels!=0")
 	}
 
 	sdb := &StateDB{
-		path: path + PathStateDB,
+		path: path,
 		db:   sto,
 		mt:   mt,
 		typ:  typ,
@@ -163,6 +161,7 @@ // MakeCheckpoint does a checkpoint at the given batchNum in the defined path. Internally this advances & stores the current BatchNum, and then stores a Checkpoint of the current state of the StateDB.
 func (s *StateDB) MakeCheckpoint() error {
 	// advance currentBatch
 	s.currentBatch++
+	log.Debugw("Making StateDB checkpoint", "batch", s.currentBatch, "type", s.typ)
 
 	checkpointPath := s.path + PathBatchNum + strconv.Itoa(int(s.currentBatch))
 

@@ -49,8 +49,13 @@ // returns common.ExitTreeLeaf that is later used by the Synchronizer to update
 // the HistoryDB, and adds Nonce & TokenID to the L2Txs.
 // And if TypeSynchronizer returns an array of common.Account with all the
 // created accounts.
-func (s *StateDB) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinatortxs []common.L1Tx, l2txs []common.PoolL2Tx) (*ProcessTxOutput, error) {
-	var err error
+func (s *StateDB) ProcessTxs(coordIdxs []common.Idx, l1usertxs, l1coordinatortxs []common.L1Tx, l2txs []common.PoolL2Tx) (ptOut *ProcessTxOutput, err error) {
+	defer func() {
+		if err == nil {
+			err = s.MakeCheckpoint()
+		}
+	}()
+
 	var exitTree *merkletree.MerkleTree
 	var createdAccounts []common.Account
 
@@ -829,7 +834,7 @@ }
 	if err != nil {
 		return 0, err
 	}
-	return common.IdxFromBytes(idxBytes[:4])
+	return common.IdxFromBytes(idxBytes[:])
 }
 
 // setIdx stores Idx in the localStateDB

@@ -2,6 +2,7 @@ package node
 
 import (
 	"context"
+	"sync"
 	"time"
 
 	"github.com/ethereum/go-ethereum/ethclient"
@@ -16,6 +17,7 @@ "github.com/hermeznetwork/hermez-node/db/statedb"
 	"github.com/hermeznetwork/hermez-node/eth"
 	"github.com/hermeznetwork/hermez-node/log"
 	"github.com/hermeznetwork/hermez-node/synchronizer"
+	"github.com/hermeznetwork/hermez-node/test/debugapi"
 	"github.com/hermeznetwork/hermez-node/txselector"
 	"github.com/jmoiron/sqlx"
 )
@@ -37,6 +39,7 @@ )
 
 // Node is the Hermez Node
 type Node struct {
+	debugAPI *debugapi.DebugAPI
 	// Coordinator
 	coord                    *coordinator.Coordinator
 	coordCfg                 *config.Coordinator
@@ -48,14 +51,14 @@ stoppedGetProofCallForge chan bool
 	stoppedForgeCallConfirm  chan bool
 
 	// Synchronizer
-	sync        *synchronizer.Synchronizer
-	stoppedSync chan bool
+	sync *synchronizer.Synchronizer
 
 	// General
 	cfg     *config.Node
 	mode    Mode
 	sqlConn *sqlx.DB
 	ctx     context.Context
+	wg      sync.WaitGroup
 	cancel  context.CancelFunc
 }
 
@@ -154,9 +157,15 @@ batchBuilder,
 			serverProofs,
 			client,
 		)
+	}
+	var debugAPI *debugapi.DebugAPI
+	println("apiaddr", cfg.Debug.APIAddress)
+	if cfg.Debug.APIAddress != "" {
+		debugAPI = debugapi.NewDebugAPI(cfg.Debug.APIAddress, stateDB)
 	}
 	ctx, cancel := context.WithCancel(context.Background())
 	return &Node{
+		debugAPI: debugAPI,
 		coord:    coord,
 		coordCfg: coordCfg,
 		sync:     sync,
@@ -171,6 +180,9 @@
 // StartCoordinator starts the coordinator
 func (n *Node) StartCoordinator() {
 	log.Info("Starting Coordinator...")
+
+	// TODO: Replace stopXXX by context
+	// TODO: Replace stoppedXXX by waitgroup
 
 	n.stopForge = make(chan bool)
 	n.stopGetProofCallForge = make(chan bool)
@@ -249,18 +261,18 @@
 // StartSynchronizer starts the synchronizer
 func (n *Node) StartSynchronizer() {
 	log.Info("Starting Synchronizer...")
-	// stopped channel is size 1 so that the defer doesn't block
-	n.stoppedSync = make(chan bool, 1)
+	n.wg.Add(1)
 	go func() {
 		defer func() {
-			n.stoppedSync <- true
+			log.Info("Synchronizer routine stopped")
+			n.wg.Done()
 		}()
 		var lastBlock *common.Block
 		d := time.Duration(0)
 		for {
 			select {
 			case <-n.ctx.Done():
-				log.Info("Synchronizer stopped")
+				log.Info("Synchronizer done")
 				return
 			case <-time.After(d):
 				if blockData, discarded, err := n.sync.Sync2(n.ctx, lastBlock); err != nil {
@@ -283,15 +295,27 @@ }()
 	// TODO: Run price updater.  This is required by the API and the TxSelector
 }
 
-// WaitStopSynchronizer waits for the synchronizer to stop
-func (n *Node) WaitStopSynchronizer() {
-	log.Info("Waiting for Synchronizer to stop...")
-	<-n.stoppedSync
+// StartDebugAPI starts the DebugAPI
+func (n *Node) StartDebugAPI() {
+	log.Info("Starting DebugAPI...")
+	n.wg.Add(1)
+	go func() {
+		defer func() {
+			log.Info("DebugAPI routine stopped")
+			n.wg.Done()
+		}()
+		if err := n.debugAPI.Run(n.ctx); err != nil {
+			log.Fatalw("DebugAPI.Run", "err", err)
+		}
+	}()
 }
 
 // Start the node
 func (n *Node) Start() {
 	log.Infow("Starting node...", "mode", n.mode)
+	if n.debugAPI != nil {
+		n.StartDebugAPI()
+	}
 	if n.mode == ModeCoordinator {
 		n.StartCoordinator()
 	}
@@ -305,5 +329,5 @@ n.cancel()
 	if n.mode == ModeCoordinator {
 		n.StopCoordinator()
 	}
-	n.WaitStopSynchronizer()
+	n.wg.Wait()
 }

@@ -92,6 +92,9 @@ debugAPI := api.Group("/debug")
 
 	debugAPI.GET("sdb/batchnum", a.handleCurrentBatch)
 	debugAPI.GET("sdb/mtroot", a.handleMTRoot)
+	// Accounts returned by these endpoints will always have BatchNum = 0,
+	// because the stateDB doesn't store the BatchNum in which an account
+	// is created.
 	debugAPI.GET("sdb/accounts", a.handleAccounts)
 	debugAPI.GET("sdb/accounts/:Idx", a.handleAccount)
 
@@ -104,7 +107,7 @@ WriteTimeout:   30 * time.Second, //nolint:gomnd
 		MaxHeaderBytes: 1 << 20,          //nolint:gomnd
 	}
 	go func() {
-		log.Infof("Debug API is ready at %v", a.addr)
+		log.Infof("DebugAPI is ready at %v", a.addr)
 		if err := debugAPIServer.ListenAndServe(); err != nil &&
 			err != http.ErrServerClosed {
 			log.Fatalf("Listen: %s\n", err)
@@ -112,10 +115,10 @@ }
 	}()
 
 	<-ctx.Done()
-	log.Info("Stopping Debug API...")
+	log.Info("Stopping DebugAPI...")
 	if err := debugAPIServer.Shutdown(context.Background()); err != nil {
 		return err
 	}
-	log.Info("Debug API stopped")
+	log.Info("DebugAPI done")
 	return nil
 }