Allow serving API only via new cli command

- Add new command to the cli/node: `serveapi` that alows serving the API just by connecting to the PostgreSQL database. The mode flag should me passed in order to select whether we are connecting to a synchronizer database or a coordinator database. If `coord` is chosen as mode, the coordinator endpoints can be activated in order to allow inserting l2txs and authorizations into the L2DB. Summary of the implementation details - New SQL table with 3 columns (plus `item_id` pk). The table only contains a single row with `item_id` = 1. Columns: - state: historydb.StateAPI in JSON. This is the struct that is served via the `/state` API endpoint. The node will periodically update this struct and store it int he DB. The api server will query it from the DB to serve it. - config: historydb.NodeConfig in JSON. This struct contains node configuration parameters that the API needs to be aware of. It's updated once every time the node starts. - constants: historydb.Constants in JSON. This struct contains all the hermez network constants gathered via the ethereum client by the node. It's written once every time the node starts. - The HistoryDB contains methods to get and update each one of these columns individually. - The HistoryDB contains all methods that query the DB and prepare objects that will appear in the StateAPI endpoint. - The configuration used in for the `serveapi` cli/node command is defined in `config.APIServer`, and is a subset of `node.Config` in order to allow reusing the same configuration file of the node if desired. - A new object is introduced in the api: `StateAPIUpdater`, which contains all the necessary information to update the StateAPI in the DB periodically by the node. - Moved the types `SCConsts`, `SCVariables` and `SCVariablesPtr` from `syncrhonizer` to `common` for convenience.
2026-02-07 03:16:45 +01:00 · 2021-02-26 12:40:00 +01:00
parent a5dcc67a08
commit d625cc9287
25 changed files with 1436 additions and 869 deletions
--- a/db/historydb/apiqueries.go
+++ b/db/historydb/apiqueries.go
@@ -1,8 +1,11 @@
 package historydb

 import (
+	"database/sql"
 	"errors"
 	"fmt"
+	"math/big"
+	"time"

 	ethCommon "github.com/ethereum/go-ethereum/common"
 	"github.com/hermeznetwork/hermez-node/common"
@@ -32,9 +35,18 @@ func (hdb *HistoryDB) GetBatchAPI(batchNum common.BatchNum) (*BatchAPI, error) {
 		return nil, tracerr.Wrap(err)
 	}
 	defer hdb.apiConnCon.Release()
+	return hdb.getBatchAPI(hdb.dbRead, batchNum)
+}
+
+// GetBatchInternalAPI return the batch with the given batchNum
+func (hdb *HistoryDB) GetBatchInternalAPI(batchNum common.BatchNum) (*BatchAPI, error) {
+	return hdb.getBatchAPI(hdb.dbRead, batchNum)
+}
+
+func (hdb *HistoryDB) getBatchAPI(d meddler.DB, batchNum common.BatchNum) (*BatchAPI, error) {
 	batch := &BatchAPI{}
 	return batch, tracerr.Wrap(meddler.QueryRow(
-		hdb.dbRead, batch,
+		d, 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,
@@ -180,6 +192,14 @@ func (hdb *HistoryDB) GetBestBidsAPI(
 		return nil, 0, tracerr.Wrap(err)
 	}
 	defer hdb.apiConnCon.Release()
+	return hdb.getBestBidsAPI(hdb.dbRead, minSlotNum, maxSlotNum, bidderAddr, limit, order)
+}
+func (hdb *HistoryDB) getBestBidsAPI(
+	d meddler.DB,
+	minSlotNum, maxSlotNum *int64,
+	bidderAddr *ethCommon.Address,
+	limit *uint, order string,
+) ([]BidAPI, uint64, error) {
 	var query string
 	var args []interface{}
 	// JOIN the best bid of each slot with the latest update of each coordinator
@@ -214,7 +234,7 @@ func (hdb *HistoryDB) GetBestBidsAPI(
 	}
 	query = hdb.dbRead.Rebind(queryStr)
 	bidPtrs := []*BidAPI{}
-	if err := meddler.QueryAll(hdb.dbRead, &bidPtrs, query, args...); err != nil {
+	if err := meddler.QueryAll(d, &bidPtrs, query, args...); err != nil {
 		return nil, 0, tracerr.Wrap(err)
 	}
 	// log.Debug(query)
@@ -697,25 +717,6 @@ func (hdb *HistoryDB) GetExitsAPI(
 	return db.SlicePtrsToSlice(exits).([]ExitAPI), exits[0].TotalItems - uint64(len(exits)), nil
 }

-// GetBucketUpdatesAPI retrieves latest values for each bucket
-func (hdb *HistoryDB) GetBucketUpdatesAPI() ([]BucketUpdateAPI, error) {
-	cancel, err := hdb.apiConnCon.Acquire()
-	defer cancel()
-	if err != nil {
-		return nil, tracerr.Wrap(err)
-	}
-	defer hdb.apiConnCon.Release()
-	var bucketUpdates []*BucketUpdateAPI
-	err = meddler.QueryAll(
-		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) 
-		ORDER BY num_bucket ASC;`,
-	)
-	return db.SlicePtrsToSlice(bucketUpdates).([]BucketUpdateAPI), tracerr.Wrap(err)
-}
-
 // GetCoordinatorsAPI returns a list of coordinators from the DB and pagination info
 func (hdb *HistoryDB) GetCoordinatorsAPI(
 	bidderAddr, forgerAddr *ethCommon.Address,
@@ -800,29 +801,6 @@ func (hdb *HistoryDB) GetAuctionVarsAPI() (*common.AuctionVariables, error) {
 	return auctionVars, tracerr.Wrap(err)
 }

-// GetAuctionVarsUntilSetSlotNumAPI returns all the updates of the auction vars
-// from the last entry in which DefaultSlotSetBidSlotNum <= slotNum
-func (hdb *HistoryDB) GetAuctionVarsUntilSetSlotNumAPI(slotNum int64, maxItems int) ([]MinBidInfo, error) {
-	cancel, err := hdb.apiConnCon.Acquire()
-	defer cancel()
-	if err != nil {
-		return nil, tracerr.Wrap(err)
-	}
-	defer hdb.apiConnCon.Release()
-	auctionVars := []*MinBidInfo{}
-	query := `
-		SELECT DISTINCT default_slot_set_bid, default_slot_set_bid_slot_num FROM auction_vars
-		WHERE default_slot_set_bid_slot_num < $1
-		ORDER BY default_slot_set_bid_slot_num DESC
-		LIMIT $2;
-	`
-	err = meddler.QueryAll(hdb.dbRead, &auctionVars, query, slotNum, maxItems)
-	if err != nil {
-		return nil, tracerr.Wrap(err)
-	}
-	return db.SlicePtrsToSlice(auctionVars).([]MinBidInfo), nil
-}
-
 // GetAccountAPI returns an account by its index
 func (hdb *HistoryDB) GetAccountAPI(idx common.Idx) (*AccountAPI, error) {
 	cancel, err := hdb.apiConnCon.Acquire()
@@ -941,125 +919,6 @@ func (hdb *HistoryDB) GetAccountsAPI(
 		accounts[0].TotalItems - uint64(len(accounts)), nil
 }

-// GetMetricsAPI returns metrics
-func (hdb *HistoryDB) GetMetricsAPI(lastBatchNum common.BatchNum) (*Metrics, error) {
-	cancel, err := hdb.apiConnCon.Acquire()
-	defer cancel()
-	if err != nil {
-		return nil, tracerr.Wrap(err)
-	}
-	defer hdb.apiConnCon.Release()
-	metricsTotals := &MetricsTotals{}
-	metrics := &Metrics{}
-	err = meddler.QueryRow(
-		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)
-	}
-
-	seconds := metricsTotals.MaxTimestamp.Sub(metricsTotals.MinTimestamp).Seconds()
-	// Avoid dividing by 0
-	if seconds == 0 {
-		seconds++
-	}
-
-	metrics.TransactionsPerSecond = float64(metricsTotals.TotalTransactions) / seconds
-
-	if (lastBatchNum - metricsTotals.FirstBatchNum) > 0 {
-		metrics.TransactionsPerBatch = float64(metricsTotals.TotalTransactions) /
-			float64(lastBatchNum-metricsTotals.FirstBatchNum+1)
-	} else {
-		metrics.TransactionsPerBatch = float64(0)
-	}
-
-	err = meddler.QueryRow(
-		hdb.dbRead, metricsTotals, `SELECT COUNT(*) AS total_batches, 
-		COALESCE (SUM(total_fees_usd), 0) AS total_fees FROM batch 
-		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 {
-		metrics.BatchFrequency = 0
-	}
-	if metricsTotals.TotalTransactions > 0 {
-		metrics.AvgTransactionFee = metricsTotals.TotalFeesUSD / float64(metricsTotals.TotalTransactions)
-	} else {
-		metrics.AvgTransactionFee = 0
-	}
-	err = meddler.QueryRow(
-		hdb.dbRead, metrics,
-		`SELECT COUNT(*) AS total_bjjs, COUNT(DISTINCT(bjj)) AS total_accounts FROM account;`)
-	if err != nil {
-		return nil, tracerr.Wrap(err)
-	}
-	err = meddler.QueryRow(
-		hdb.dbRead, metrics,
-		`SELECT COALESCE (AVG(EXTRACT(EPOCH FROM (forged.timestamp - added.timestamp))), 0)
-			AS estimated_time_to_forge_l1 FROM tx
-		INNER JOIN block AS added ON tx.eth_block_num = added.eth_block_num
-		INNER JOIN batch AS forged_batch ON tx.batch_num = forged_batch.batch_num
-		INNER JOIN block AS forged ON forged_batch.eth_block_num = forged.eth_block_num
-		WHERE tx.batch_num between $1 and $2 AND tx.is_l1 AND tx.user_origin;`,
-		metricsTotals.FirstBatchNum, lastBatchNum,
-	)
-	if err != nil {
-		return nil, tracerr.Wrap(err)
-	}
-
-	return metrics, nil
-}
-
-// GetAvgTxFeeAPI returns average transaction fee of the last 1h
-func (hdb *HistoryDB) GetAvgTxFeeAPI() (float64, error) {
-	cancel, err := hdb.apiConnCon.Acquire()
-	defer cancel()
-	if err != nil {
-		return 0, tracerr.Wrap(err)
-	}
-	defer hdb.apiConnCon.Release()
-	metricsTotals := &MetricsTotals{}
-	err = meddler.QueryRow(
-		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';`)
-	if err != nil {
-		return 0, tracerr.Wrap(err)
-	}
-	err = meddler.QueryRow(
-		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 {
-		return 0, tracerr.Wrap(err)
-	}
-
-	var avgTransactionFee float64
-	if metricsTotals.TotalTransactions > 0 {
-		avgTransactionFee = metricsTotals.TotalFeesUSD / float64(metricsTotals.TotalTransactions)
-	} else {
-		avgTransactionFee = 0
-	}
-
-	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()
@@ -1075,3 +934,253 @@ func (hdb *HistoryDB) GetCommonAccountAPI(idx common.Idx) (*common.Account, erro
 	)
 	return account, tracerr.Wrap(err)
 }
+
+// GetCoordinatorAPI returns a coordinator by its bidderAddr
+func (hdb *HistoryDB) GetCoordinatorAPI(bidderAddr ethCommon.Address) (*CoordinatorAPI, error) {
+	cancel, err := hdb.apiConnCon.Acquire()
+	defer cancel()
+	if err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+	defer hdb.apiConnCon.Release()
+	return hdb.getCoordinatorAPI(hdb.dbRead, bidderAddr)
+}
+
+func (hdb *HistoryDB) getCoordinatorAPI(d meddler.DB, bidderAddr ethCommon.Address) (*CoordinatorAPI, error) {
+	coordinator := &CoordinatorAPI{}
+	err := meddler.QueryRow(
+		d, coordinator,
+		"SELECT * FROM coordinator WHERE bidder_addr = $1 ORDER BY item_id DESC LIMIT 1;",
+		bidderAddr,
+	)
+	return coordinator, tracerr.Wrap(err)
+}
+
+// GetNodeInfoAPI retusnt he NodeInfo
+func (hdb *HistoryDB) GetNodeInfoAPI() (*NodeInfo, error) {
+	cancel, err := hdb.apiConnCon.Acquire()
+	defer cancel()
+	if err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+	defer hdb.apiConnCon.Release()
+	return hdb.GetNodeInfo()
+}
+
+// GetBucketUpdatesInternalAPI returns the latest bucket updates
+func (hdb *HistoryDB) GetBucketUpdatesInternalAPI() ([]BucketUpdateAPI, error) {
+	var bucketUpdates []*BucketUpdateAPI
+	err := meddler.QueryAll(
+		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) 
+			ORDER BY num_bucket ASC;`,
+	)
+	return db.SlicePtrsToSlice(bucketUpdates).([]BucketUpdateAPI), tracerr.Wrap(err)
+}
+
+// GetNextForgersInternalAPI returns next forgers
+func (hdb *HistoryDB) GetNextForgersInternalAPI(auctionVars *common.AuctionVariables,
+	auctionConsts *common.AuctionConstants,
+	lastBlock common.Block, currentSlot, lastClosedSlot int64) ([]NextForgerAPI, error) {
+	secondsPerBlock := int64(15) //nolint:gomnd
+	// currentSlot and lastClosedSlot included
+	limit := uint(lastClosedSlot - currentSlot + 1)
+	bids, _, err := hdb.getBestBidsAPI(hdb.dbRead, &currentSlot, &lastClosedSlot, nil, &limit, "ASC")
+	if err != nil && tracerr.Unwrap(err) != sql.ErrNoRows {
+		return nil, tracerr.Wrap(err)
+	}
+	nextForgers := []NextForgerAPI{}
+	// Get min bid info
+	var minBidInfo []MinBidInfo
+	if currentSlot >= auctionVars.DefaultSlotSetBidSlotNum {
+		// All min bids can be calculated with the last update of AuctionVariables
+
+		minBidInfo = []MinBidInfo{{
+			DefaultSlotSetBid:        auctionVars.DefaultSlotSetBid,
+			DefaultSlotSetBidSlotNum: auctionVars.DefaultSlotSetBidSlotNum,
+		}}
+	} else {
+		// Get all the relevant updates from the DB
+		minBidInfo, err = hdb.getMinBidInfo(hdb.dbRead, currentSlot, lastClosedSlot)
+		if err != nil {
+			return nil, tracerr.Wrap(err)
+		}
+	}
+	// Create nextForger for each slot
+	for i := currentSlot; i <= lastClosedSlot; i++ {
+		fromBlock := i*int64(auctionConsts.BlocksPerSlot) +
+			auctionConsts.GenesisBlockNum
+		toBlock := (i+1)*int64(auctionConsts.BlocksPerSlot) +
+			auctionConsts.GenesisBlockNum - 1
+		nextForger := NextForgerAPI{
+			Period: Period{
+				SlotNum:   i,
+				FromBlock: fromBlock,
+				ToBlock:   toBlock,
+				FromTimestamp: lastBlock.Timestamp.Add(time.Second *
+					time.Duration(secondsPerBlock*(fromBlock-lastBlock.Num))),
+				ToTimestamp: lastBlock.Timestamp.Add(time.Second *
+					time.Duration(secondsPerBlock*(toBlock-lastBlock.Num))),
+			},
+		}
+		foundForger := false
+		// If there is a bid for a slot, get forger (coordinator)
+		for j := range bids {
+			slotNum := bids[j].SlotNum
+			if slotNum == i {
+				// There's a bid for the slot
+				// Check if the bid is greater than the minimum required
+				for i := 0; i < len(minBidInfo); i++ {
+					// Find the most recent update
+					if slotNum >= minBidInfo[i].DefaultSlotSetBidSlotNum {
+						// Get min bid
+						minBidSelector := slotNum % int64(len(auctionVars.DefaultSlotSetBid))
+						minBid := minBidInfo[i].DefaultSlotSetBid[minBidSelector]
+						// Check if the bid has beaten the minimum
+						bid, ok := new(big.Int).SetString(string(bids[j].BidValue), 10)
+						if !ok {
+							return nil, tracerr.New("Wrong bid value, error parsing it as big.Int")
+						}
+						if minBid.Cmp(bid) == 1 {
+							// Min bid is greater than bid, the slot will be forged by boot coordinator
+							break
+						}
+						foundForger = true
+						break
+					}
+				}
+				if !foundForger { // There is no bid or it's smaller than the minimum
+					break
+				}
+				coordinator, err := hdb.getCoordinatorAPI(hdb.dbRead, bids[j].Bidder)
+				if err != nil {
+					return nil, tracerr.Wrap(err)
+				}
+				nextForger.Coordinator = *coordinator
+				break
+			}
+		}
+		// If there is no bid, the coordinator that will forge is boot coordinator
+		if !foundForger {
+			nextForger.Coordinator = CoordinatorAPI{
+				Forger: auctionVars.BootCoordinator,
+				URL:    auctionVars.BootCoordinatorURL,
+			}
+		}
+		nextForgers = append(nextForgers, nextForger)
+	}
+	return nextForgers, nil
+}
+
+// GetMetricsInternalAPI returns the MetricsAPI
+func (hdb *HistoryDB) GetMetricsInternalAPI(lastBatchNum common.BatchNum) (*MetricsAPI, error) {
+	var metrics MetricsAPI
+	// Get the first and last batch of the last 24h and their timestamps
+	// if u.state.Network.LastBatch == nil {
+	// 	return &metrics, nil
+	// }
+	type period struct {
+		FromBatchNum  common.BatchNum `meddler:"from_batch_num"`
+		FromTimestamp time.Time       `meddler:"from_timestamp"`
+		ToBatchNum    common.BatchNum `meddler:"-"`
+		ToTimestamp   time.Time       `meddler:"to_timestamp"`
+	}
+	p := &period{
+		ToBatchNum: lastBatchNum,
+	}
+	if err := meddler.QueryRow(
+		hdb.dbRead, p, `SELECT
+			COALESCE (MIN(batch.batch_num), 0) as from_batch_num,
+			COALESCE (MIN(block.timestamp), NOW()) AS from_timestamp, 
+			COALESCE (MAX(block.timestamp), NOW()) AS to_timestamp
+			FROM batch INNER JOIN block ON batch.eth_block_num = block.eth_block_num
+			WHERE block.timestamp >= NOW() - INTERVAL '24 HOURS';`,
+	); err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+	// Get the amount of txs of that period
+	row := hdb.dbRead.QueryRow(
+		`SELECT COUNT(*) as total_txs FROM tx WHERE tx.batch_num between $1 AND $2;`,
+		p.FromBatchNum, p.ToBatchNum,
+	)
+	var nTxs int
+	if err := row.Scan(&nTxs); err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+	// Set txs/s
+	seconds := p.ToTimestamp.Sub(p.FromTimestamp).Seconds()
+	if seconds == 0 { // Avoid dividing by 0
+		seconds++
+	}
+	metrics.TransactionsPerSecond = float64(nTxs) / seconds
+	// Set txs/batch
+	nBatches := p.ToBatchNum - p.FromBatchNum + 1
+	if nBatches == 0 { // Avoid dividing by 0
+		nBatches++
+	}
+	if (p.ToBatchNum - p.FromBatchNum) > 0 {
+		fmt.Printf("DBG ntxs: %v, nBatches: %v\n", nTxs, nBatches)
+		metrics.TransactionsPerBatch = float64(nTxs) /
+			float64(nBatches)
+	} else {
+		metrics.TransactionsPerBatch = 0
+	}
+	// Get total fee of that period
+	row = hdb.dbRead.QueryRow(
+		`SELECT COALESCE (SUM(total_fees_usd), 0) FROM batch WHERE batch_num between $1 AND $2;`,
+		p.FromBatchNum, p.ToBatchNum,
+	)
+	var totalFee float64
+	if err := row.Scan(&totalFee); err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+	// Set batch frequency
+	metrics.BatchFrequency = seconds / float64(nBatches)
+	if nTxs > 0 {
+		metrics.AvgTransactionFee = totalFee / float64(nTxs)
+	} else {
+		metrics.AvgTransactionFee = 0
+	}
+	// Get and set amount of registered accounts
+	type registeredAccounts struct {
+		TotalIdx int64 `meddler:"total_idx"`
+		TotalBJJ int64 `meddler:"total_bjj"`
+	}
+	ra := &registeredAccounts{}
+	if err := meddler.QueryRow(
+		hdb.dbRead, ra,
+		`SELECT COUNT(*) AS total_bjj, COUNT(DISTINCT(bjj)) AS total_idx FROM account;`,
+	); err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+	metrics.TotalAccounts = ra.TotalIdx
+	metrics.TotalBJJs = ra.TotalBJJ
+	// Get and set estimated time to forge L1 tx
+	row = hdb.dbRead.QueryRow(
+		`SELECT COALESCE (AVG(EXTRACT(EPOCH FROM (forged.timestamp - added.timestamp))), 0) FROM tx
+			INNER JOIN block AS added ON tx.eth_block_num = added.eth_block_num
+			INNER JOIN batch AS forged_batch ON tx.batch_num = forged_batch.batch_num
+			INNER JOIN block AS forged ON forged_batch.eth_block_num = forged.eth_block_num
+			WHERE tx.batch_num between $1 and $2 AND tx.is_l1 AND tx.user_origin;`,
+		p.FromBatchNum, p.ToBatchNum,
+	)
+	var timeToForgeL1 float64
+	if err := row.Scan(&timeToForgeL1); err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+	metrics.EstimatedTimeToForgeL1 = timeToForgeL1
+	return &metrics, nil
+}
+
+// GetStateAPI returns the StateAPI
+func (hdb *HistoryDB) GetStateAPI() (*StateAPI, error) {
+	cancel, err := hdb.apiConnCon.Acquire()
+	defer cancel()
+	if err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+	defer hdb.apiConnCon.Release()
+	return hdb.getStateAPI(hdb.dbRead)
+}
--- a/db/historydb/historydb.go
+++ b/db/historydb/historydb.go
@@ -839,6 +839,18 @@ func (hdb *HistoryDB) GetAllBucketUpdates() ([]common.BucketUpdate, error) {
 	return db.SlicePtrsToSlice(bucketUpdates).([]common.BucketUpdate), tracerr.Wrap(err)
 }

+func (hdb *HistoryDB) getMinBidInfo(d meddler.DB,
+	currentSlot, lastClosedSlot int64) ([]MinBidInfo, error) {
+	minBidInfo := []*MinBidInfo{}
+	query := `
+		SELECT DISTINCT default_slot_set_bid, default_slot_set_bid_slot_num FROM auction_vars
+		WHERE default_slot_set_bid_slot_num < $1
+		ORDER BY default_slot_set_bid_slot_num DESC
+		LIMIT $2;`
+	err := meddler.QueryAll(d, &minBidInfo, query, lastClosedSlot, int(lastClosedSlot-currentSlot)+1)
+	return db.SlicePtrsToSlice(minBidInfo).([]MinBidInfo), tracerr.Wrap(err)
+}
+
 func (hdb *HistoryDB) addTokenExchanges(d meddler.DB, tokenExchanges []common.TokenExchange) error {
 	if len(tokenExchanges) == 0 {
 		return nil
@@ -1137,17 +1149,6 @@ func (hdb *HistoryDB) AddBlockSCData(blockData *common.BlockData) (err error) {
 	return tracerr.Wrap(txn.Commit())
 }

-// GetCoordinatorAPI returns a coordinator by its bidderAddr
-func (hdb *HistoryDB) GetCoordinatorAPI(bidderAddr ethCommon.Address) (*CoordinatorAPI, error) {
-	coordinator := &CoordinatorAPI{}
-	err := meddler.QueryRow(
-		hdb.dbRead, coordinator,
-		"SELECT * FROM coordinator WHERE bidder_addr = $1 ORDER BY item_id DESC LIMIT 1;",
-		bidderAddr,
-	)
-	return coordinator, tracerr.Wrap(err)
-}
-
 // AddAuctionVars insert auction vars into the DB
 func (hdb *HistoryDB) AddAuctionVars(auctionVars *common.AuctionVariables) error {
 	return tracerr.Wrap(meddler.Insert(hdb.dbWrite, "auction_vars", auctionVars))
@@ -1167,3 +1168,60 @@ func (hdb *HistoryDB) GetTokensTest() ([]TokenWithUSD, error) {
 	}
 	return db.SlicePtrsToSlice(tokens).([]TokenWithUSD), nil
 }
+
+const (
+	// CreateAccountExtraFeePercentage is the multiplication factor over
+	// the average fee for CreateAccount that is applied to obtain the
+	// recommended fee for CreateAccount
+	CreateAccountExtraFeePercentage float64 = 2.5
+	// CreateAccountInternalExtraFeePercentage is the multiplication factor
+	// over the average fee for CreateAccountInternal that is applied to
+	// obtain the recommended fee for CreateAccountInternal
+	CreateAccountInternalExtraFeePercentage float64 = 2.0
+)
+
+// GetRecommendedFee returns the RecommendedFee information
+func (hdb *HistoryDB) GetRecommendedFee(minFeeUSD float64) (*common.RecommendedFee, error) {
+	var recommendedFee common.RecommendedFee
+	// Get total txs and the batch of the first selected tx of the last hour
+	type totalTxsSinceBatchNum struct {
+		TotalTxs      int             `meddler:"total_txs"`
+		FirstBatchNum common.BatchNum `meddler:"batch_num"`
+	}
+	ttsbn := &totalTxsSinceBatchNum{}
+	if err := meddler.QueryRow(
+		hdb.dbRead, ttsbn, `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';`,
+	); err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+	// Get the amount of batches and acumulated fees for the last hour
+	type totalBatchesAndFee struct {
+		TotalBatches int     `meddler:"total_batches"`
+		TotalFees    float64 `meddler:"total_fees"`
+	}
+	tbf := &totalBatchesAndFee{}
+	if err := meddler.QueryRow(
+		hdb.dbRead, tbf, `SELECT COUNT(*) AS total_batches, 
+			COALESCE (SUM(total_fees_usd), 0) AS total_fees FROM batch 
+			WHERE batch_num > $1;`, ttsbn.FirstBatchNum,
+	); err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+	// Update NodeInfo struct
+	var avgTransactionFee float64
+	if ttsbn.TotalTxs > 0 {
+		avgTransactionFee = tbf.TotalFees / float64(ttsbn.TotalTxs)
+	} else {
+		avgTransactionFee = 0
+	}
+	recommendedFee.ExistingAccount =
+		math.Max(avgTransactionFee, minFeeUSD)
+	recommendedFee.CreatesAccount =
+		math.Max(CreateAccountExtraFeePercentage*avgTransactionFee, minFeeUSD)
+	recommendedFee.CreatesAccountInternal =
+		math.Max(CreateAccountInternalExtraFeePercentage*avgTransactionFee, minFeeUSD)
+	return &recommendedFee, nil
+}
--- a/db/historydb/historydb_test.go
+++ b/db/historydb/historydb_test.go
@@ -1176,7 +1176,7 @@ func TestGetMetricsAPI(t *testing.T) {
 		assert.NoError(t, err)
 	}

-	res, err := historyDBWithACC.GetMetricsAPI(common.BatchNum(numBatches))
+	res, err := historyDB.GetMetricsInternalAPI(common.BatchNum(numBatches))
 	assert.NoError(t, err)

 	assert.Equal(t, float64(numTx)/float64(numBatches), res.TransactionsPerBatch)
@@ -1254,7 +1254,7 @@ func TestGetMetricsAPIMoreThan24Hours(t *testing.T) {
 		assert.NoError(t, err)
 	}

-	res, err := historyDBWithACC.GetMetricsAPI(common.BatchNum(numBatches))
+	res, err := historyDBWithACC.GetMetricsInternalAPI(common.BatchNum(numBatches))
 	assert.NoError(t, err)

 	assert.InEpsilon(t, 1.0, res.TransactionsPerBatch, 0.1)
@@ -1269,13 +1269,7 @@ func TestGetMetricsAPIMoreThan24Hours(t *testing.T) {

 func TestGetMetricsAPIEmpty(t *testing.T) {
 	test.WipeDB(historyDB.DB())
-	_, err := historyDBWithACC.GetMetricsAPI(0)
-	assert.NoError(t, err)
-}
-
-func TestGetAvgTxFeeEmpty(t *testing.T) {
-	test.WipeDB(historyDB.DB())
-	_, err := historyDBWithACC.GetAvgTxFeeAPI()
+	_, err := historyDBWithACC.GetMetricsInternalAPI(0)
 	assert.NoError(t, err)
 }

@@ -1464,3 +1458,65 @@ func setTestBlocks(from, to int64) []common.Block {
 	}
 	return blocks
 }
+
+func TestNodeInfo(t *testing.T) {
+	test.WipeDB(historyDB.DB())
+
+	err := historyDB.SetStateInternalAPI(&StateAPI{})
+	require.NoError(t, err)
+
+	clientSetup := test.NewClientSetupExample()
+	constants := &Constants{
+		SCConsts: common.SCConsts{
+			Rollup:   *clientSetup.RollupConstants,
+			Auction:  *clientSetup.AuctionConstants,
+			WDelayer: *clientSetup.WDelayerConstants,
+		},
+		ChainID:       42,
+		HermezAddress: clientSetup.AuctionConstants.HermezRollup,
+	}
+	err = historyDB.SetConstants(constants)
+	require.NoError(t, err)
+
+	// Test parameters
+	stateAPI := &StateAPI{
+		NodePublicConfig: NodePublicConfig{
+			ForgeDelay: 3.1,
+		},
+		Network: NetworkAPI{
+			LastEthBlock:  12,
+			LastSyncBlock: 34,
+		},
+		Metrics: MetricsAPI{
+			TransactionsPerBatch: 1.1,
+			TotalAccounts:        42,
+		},
+		Rollup:            *NewRollupVariablesAPI(clientSetup.RollupVariables),
+		Auction:           *NewAuctionVariablesAPI(clientSetup.AuctionVariables),
+		WithdrawalDelayer: *clientSetup.WDelayerVariables,
+		RecommendedFee: common.RecommendedFee{
+			ExistingAccount: 0.15,
+		},
+	}
+	err = historyDB.SetStateInternalAPI(stateAPI)
+	require.NoError(t, err)
+
+	nodeConfig := &NodeConfig{
+		MaxPoolTxs: 123,
+		MinFeeUSD:  0.5,
+	}
+	err = historyDB.SetNodeConfig(nodeConfig)
+	require.NoError(t, err)
+
+	dbConstants, err := historyDB.GetConstants()
+	require.NoError(t, err)
+	assert.Equal(t, constants, dbConstants)
+
+	dbNodeConfig, err := historyDB.GetNodeConfig()
+	require.NoError(t, err)
+	assert.Equal(t, nodeConfig, dbNodeConfig)
+
+	dbStateAPI, err := historyDB.getStateAPI(historyDB.dbRead)
+	require.NoError(t, err)
+	assert.Equal(t, stateAPI, dbStateAPI)
+}
--- a/db/historydb/nodeinfo.go
+++ b/db/historydb/nodeinfo.go
@@ -0,0 +1,165 @@
+package historydb
+
+import (
+	"time"
+
+	ethCommon "github.com/ethereum/go-ethereum/common"
+	"github.com/hermeznetwork/hermez-node/common"
+	"github.com/hermeznetwork/tracerr"
+	"github.com/russross/meddler"
+)
+
+// Period represents a time period in ethereum
+type Period struct {
+	SlotNum       int64     `json:"slotNum"`
+	FromBlock     int64     `json:"fromBlock"`
+	ToBlock       int64     `json:"toBlock"`
+	FromTimestamp time.Time `json:"fromTimestamp"`
+	ToTimestamp   time.Time `json:"toTimestamp"`
+}
+
+// NextForgerAPI represents the next forger exposed via the API
+type NextForgerAPI struct {
+	Coordinator CoordinatorAPI `json:"coordinator"`
+	Period      Period         `json:"period"`
+}
+
+// NetworkAPI is the network state exposed via the API
+type NetworkAPI struct {
+	LastEthBlock  int64           `json:"lastEthereumBlock"`
+	LastSyncBlock int64           `json:"lastSynchedBlock"`
+	LastBatch     *BatchAPI       `json:"lastBatch"`
+	CurrentSlot   int64           `json:"currentSlot"`
+	NextForgers   []NextForgerAPI `json:"nextForgers"`
+}
+
+// NodePublicConfig is the configuration of the node that is exposed via API
+type NodePublicConfig struct {
+	// ForgeDelay in seconds
+	ForgeDelay float64 `json:"forgeDelay"`
+}
+
+// StateAPI is an object representing the node and network state exposed via the API
+type StateAPI struct {
+	// NodePublicConfig is the configuration of the node that is exposed via API
+	NodePublicConfig  NodePublicConfig         `json:"nodeConfig"`
+	Network           NetworkAPI               `json:"network"`
+	Metrics           MetricsAPI               `json:"metrics"`
+	Rollup            RollupVariablesAPI       `json:"rollup"`
+	Auction           AuctionVariablesAPI      `json:"auction"`
+	WithdrawalDelayer common.WDelayerVariables `json:"withdrawalDelayer"`
+	RecommendedFee    common.RecommendedFee    `json:"recommendedFee"`
+}
+
+// Constants contains network constants
+type Constants struct {
+	common.SCConsts
+	ChainID       uint16
+	HermezAddress ethCommon.Address
+}
+
+// NodeConfig contains the node config exposed in the API
+type NodeConfig struct {
+	MaxPoolTxs uint32
+	MinFeeUSD  float64
+	ForgeDelay float64
+}
+
+// NodeInfo contains information about he node used when serving the API
+type NodeInfo struct {
+	ItemID     int         `meddler:"item_id,pk"`
+	StateAPI   *StateAPI   `meddler:"state,json"`
+	NodeConfig *NodeConfig `meddler:"config,json"`
+	Constants  *Constants  `meddler:"constants,json"`
+}
+
+// GetNodeInfo returns the NodeInfo
+func (hdb *HistoryDB) GetNodeInfo() (*NodeInfo, error) {
+	ni := &NodeInfo{}
+	err := meddler.QueryRow(
+		hdb.dbRead, ni, `SELECT * FROM node_info WHERE item_id = 1;`,
+	)
+	return ni, tracerr.Wrap(err)
+}
+
+// GetConstants returns the Constats
+func (hdb *HistoryDB) GetConstants() (*Constants, error) {
+	var nodeInfo NodeInfo
+	err := meddler.QueryRow(
+		hdb.dbRead, &nodeInfo,
+		"SELECT constants FROM node_info WHERE item_id = 1;",
+	)
+	return nodeInfo.Constants, tracerr.Wrap(err)
+}
+
+// SetConstants sets the Constants
+func (hdb *HistoryDB) SetConstants(constants *Constants) error {
+	_constants := struct {
+		Constants *Constants `meddler:"constants,json"`
+	}{constants}
+	values, err := meddler.Default.Values(&_constants, false)
+	if err != nil {
+		return tracerr.Wrap(err)
+	}
+	_, err = hdb.dbWrite.Exec(
+		"UPDATE node_info SET constants = $1 WHERE item_id = 1;",
+		values[0],
+	)
+	return tracerr.Wrap(err)
+}
+
+// GetStateInternalAPI returns the StateAPI
+func (hdb *HistoryDB) GetStateInternalAPI() (*StateAPI, error) {
+	return hdb.getStateAPI(hdb.dbRead)
+}
+
+func (hdb *HistoryDB) getStateAPI(d meddler.DB) (*StateAPI, error) {
+	var nodeInfo NodeInfo
+	err := meddler.QueryRow(
+		d, &nodeInfo,
+		"SELECT state FROM node_info WHERE item_id = 1;",
+	)
+	return nodeInfo.StateAPI, tracerr.Wrap(err)
+}
+
+// SetStateInternalAPI sets the StateAPI
+func (hdb *HistoryDB) SetStateInternalAPI(stateAPI *StateAPI) error {
+	_stateAPI := struct {
+		StateAPI *StateAPI `meddler:"state,json"`
+	}{stateAPI}
+	values, err := meddler.Default.Values(&_stateAPI, false)
+	if err != nil {
+		return tracerr.Wrap(err)
+	}
+	_, err = hdb.dbWrite.Exec(
+		"UPDATE node_info SET state = $1 WHERE item_id = 1;",
+		values[0],
+	)
+	return tracerr.Wrap(err)
+}
+
+// GetNodeConfig returns the NodeConfig
+func (hdb *HistoryDB) GetNodeConfig() (*NodeConfig, error) {
+	var nodeInfo NodeInfo
+	err := meddler.QueryRow(
+		hdb.dbRead, &nodeInfo,
+		"SELECT config FROM node_info WHERE item_id = 1;",
+	)
+	return nodeInfo.NodeConfig, tracerr.Wrap(err)
+}
+
+// SetNodeConfig sets the NodeConfig
+func (hdb *HistoryDB) SetNodeConfig(nodeConfig *NodeConfig) error {
+	_nodeConfig := struct {
+		NodeConfig *NodeConfig `meddler:"config,json"`
+	}{nodeConfig}
+	values, err := meddler.Default.Values(&_nodeConfig, false)
+	if err != nil {
+		return tracerr.Wrap(err)
+	}
+	_, err = hdb.dbWrite.Exec(
+		"UPDATE node_info SET config = $1 WHERE item_id = 1;",
+		values[0],
+	)
+	return tracerr.Wrap(err)
+}
--- a/db/historydb/views.go
+++ b/db/historydb/views.go
@@ -308,8 +308,8 @@ type BatchAPI struct {
 	LastItem      uint64                 `json:"-" meddler:"last_item"`
 }

-// Metrics define metrics of the network
-type Metrics struct {
+// MetricsAPI define metrics of the network
+type MetricsAPI struct {
 	TransactionsPerBatch   float64 `json:"transactionsPerBatch"`
 	BatchFrequency         float64 `json:"batchFrequency"`
 	TransactionsPerSecond  float64 `json:"transactionsPerSecond"`
@@ -319,17 +319,6 @@ type Metrics struct {
 	EstimatedTimeToForgeL1 float64 `json:"estimatedTimeToForgeL1" meddler:"estimated_time_to_forge_l1"`
 }

-// MetricsTotals is used to get temporal information from HistoryDB
-// to calculate data to be stored into the Metrics struct
-type MetricsTotals struct {
-	TotalTransactions uint64          `meddler:"total_txs"`
-	FirstBatchNum     common.BatchNum `meddler:"batch_num"`
-	TotalBatches      int64           `meddler:"total_batches"`
-	TotalFeesUSD      float64         `meddler:"total_fees"`
-	MinTimestamp      time.Time       `meddler:"min_timestamp,utctime"`
-	MaxTimestamp      time.Time       `meddler:"max_timestamp,utctime"`
-}
-
 // BidAPI is a representation of a bid with additional information
 // required by the API
 type BidAPI struct {
@@ -380,6 +369,27 @@ type RollupVariablesAPI struct {
 	SafeMode              bool                                          `json:"safeMode" meddler:"safe_mode"`
 }

+// NewRollupVariablesAPI creates a RollupVariablesAPI from common.RollupVariables
+func NewRollupVariablesAPI(rollupVariables *common.RollupVariables) *RollupVariablesAPI {
+	rollupVars := RollupVariablesAPI{
+		EthBlockNum:           rollupVariables.EthBlockNum,
+		FeeAddToken:           apitypes.NewBigIntStr(rollupVariables.FeeAddToken),
+		ForgeL1L2BatchTimeout: rollupVariables.ForgeL1L2BatchTimeout,
+		WithdrawalDelay:       rollupVariables.WithdrawalDelay,
+		SafeMode:              rollupVariables.SafeMode,
+	}
+
+	for i, bucket := range rollupVariables.Buckets {
+		rollupVars.Buckets[i] = BucketParamsAPI{
+			CeilUSD:             apitypes.NewBigIntStr(bucket.CeilUSD),
+			Withdrawals:         apitypes.NewBigIntStr(bucket.Withdrawals),
+			BlockWithdrawalRate: apitypes.NewBigIntStr(bucket.BlockWithdrawalRate),
+			MaxWithdrawals:      apitypes.NewBigIntStr(bucket.MaxWithdrawals),
+		}
+	}
+	return &rollupVars
+}
+
 // AuctionVariablesAPI are the variables of the Auction Smart Contract
 type AuctionVariablesAPI struct {
 	EthBlockNum int64 `json:"ethereumBlockNum" meddler:"eth_block_num"`
@@ -404,3 +414,28 @@ type AuctionVariablesAPI struct {
 	// SlotDeadline Number of blocks at the end of a slot in which any coordinator can forge if the winner has not forged one before
 	SlotDeadline uint8 `json:"slotDeadline" meddler:"slot_deadline" validate:"required"`
 }
+
+// NewAuctionVariablesAPI creates a AuctionVariablesAPI from common.AuctionVariables
+func NewAuctionVariablesAPI(auctionVariables *common.AuctionVariables) *AuctionVariablesAPI {
+	auctionVars := AuctionVariablesAPI{
+		EthBlockNum:              auctionVariables.EthBlockNum,
+		DonationAddress:          auctionVariables.DonationAddress,
+		BootCoordinator:          auctionVariables.BootCoordinator,
+		BootCoordinatorURL:       auctionVariables.BootCoordinatorURL,
+		DefaultSlotSetBidSlotNum: auctionVariables.DefaultSlotSetBidSlotNum,
+		ClosedAuctionSlots:       auctionVariables.ClosedAuctionSlots,
+		OpenAuctionSlots:         auctionVariables.OpenAuctionSlots,
+		Outbidding:               auctionVariables.Outbidding,
+		SlotDeadline:             auctionVariables.SlotDeadline,
+	}
+
+	for i, slot := range auctionVariables.DefaultSlotSetBid {
+		auctionVars.DefaultSlotSetBid[i] = apitypes.NewBigIntStr(slot)
+	}
+
+	for i, ratio := range auctionVariables.AllocationRatio {
+		auctionVars.AllocationRatio[i] = ratio
+	}
+
+	return &auctionVars
+}