Versión modificada de bfa_client

.gitignore

+bin/

cmd/bfa_client/bfa_client.go

+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"math/big"
+	"os"
+	"path"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	"gitlab.bfa.ar/miguel/bfa/internal/bfa"
+	"gitlab.bfa.ar/miguel/bfa/internal/util"
+)
+
+const (
+	latest            = -1
+	minSigners        = 5 // We don't want to have less sealers than this number
+	voteThreshold int = 3 // Number of manual votes needed to enable autovote
+)
+
+var (
+	url         string
+	json        bool
+	help        bool
+	flags       = flag.NewFlagSet("", flag.ExitOnError)
+	description string
+	otherArgs   string
+	wei         = new(big.Float).SetFloat64(1)
+	kilowei     = new(big.Float).SetFloat64(1e3)
+	megawei     = new(big.Float).SetFloat64(1e6)
+	gigawei     = new(big.Float).SetFloat64(1e9)
+	microether  = new(big.Float).SetFloat64(1e12)
+	milliether  = new(big.Float).SetFloat64(1e15)
+	ether       = new(big.Float).SetFloat64(1e18)
+
+	units = map[string]*big.Float{
+		"wei":        wei,
+		"kwei":       kilowei,
+		"kilowei":    kilowei,
+		"babbage":    kilowei,
+		"mwei":       megawei,
+		"megawei":    megawei,
+		"lovelace":   megawei,
+		"gwei":       gigawei,
+		"gigawei":    gigawei,
+		"shannon":    gigawei,
+		"microether": microether,
+		"szabo":      microether,
+		"milliether": milliether,
+		"finney":     milliether,
+		"ether":      ether,
+	}
+)
+
+func setFlags() {
+	flags.BoolVar(&json, "json", false, "Produce salida en formato json")
+	flags.StringVar(&url, "url", "", "URL para conexión con geth. Ejemplo: '/home/bfa/bfa/network/node/geth.ipc' o 'http://localhost:8545'")
+	flags.BoolVar(&help, "h", false, "")
+	flags.BoolVar(&help, "help", false, "Muestra esta ayuda")
+}
+
+func updateURL(url string) (updated string) {
+	const (
+		defaultIPC  = "/home/bfa/bfa/network/node/geth.ipc"
+		defaultHTTP = "http://localhost:8545"
+	)
+	if url != "" { // We accept the user selected URL
+		return url
+	}
+	// First, we try IPC
+	updated = defaultIPC
+	if bfaNetworkDir := os.Getenv("BFANETWORKDIR"); bfaNetworkDir != "" {
+		updated = bfaNetworkDir + "/node/get.ipc"
+	}
+	if fileInfo, err := os.Stat(updated); err == nil && (fileInfo.Mode()&os.ModeSocket) != 0 {
+		return
+	}
+	updated = defaultHTTP
+	return
+}
+
+func usage(errorCode int) {
+	util.Require(len(os.Args) > 1, "not enough arguments")
+	_, _ = fmt.Fprintf(os.Stderr, "Uso: %v %v [opciones] %v\n%v\n", os.Args[0], os.Args[1], otherArgs, description)
+	flags.PrintDefaults()
+	os.Exit(errorCode)
+}
+
+func parseFlags(allowAdditionalArgs bool) {
+	err := flags.Parse(os.Args[2:])
+	util.Check(err)
+	if help {
+		usage(0)
+	}
+	if flags.NArg() > 0 && !allowAdditionalArgs {
+		_, _ = fmt.Fprintln(os.Stderr, "Demasiados argumentos")
+		usage(1)
+	}
+}
+
+func proposals() {
+	var blockNumber int64
+	description = "Detalla el estado de las votaciones en curso"
+	setFlags()
+	flags.Int64Var(&blockNumber, "block-number", latest, "Número del bloque en el cual se quiere conocer el estado de la propuesta (-1 para el último)")
+	parseFlags(false)
+	url = updateURL(url)
+	node, err := bfa.Dial(url)
+	util.Check(err)
+	defer node.Close()
+	blockNumber = node.BlockNumberInRange(blockNumber)
+	votes := node.Votes(blockNumber)
+	if json {
+		util.PrintJson(votes)
+		return
+	}
+	fmt.Printf("Bloque: %d\nPropuestas en curso: %d\n", votes.BlockNumber, len(votes.Proposals))
+	for _, proposal := range votes.Proposals {
+		fmt.Printf("Propuesta: %v\n", proposal.Hex())
+		for _, signer := range votes.Signers {
+			b := votes.Votes[proposal][signer]
+			var v string
+			if b == nil {
+				v = ""
+			} else {
+				v = strconv.FormatBool(*b)
+			}
+			fmt.Printf("\t%v: %v\n", signer.Hex(), v)
+		}
+		tally := votes.Tally[proposal]
+		fmt.Printf("A favor: %v, en contra: %v, no votaron: %v\n", tally.True, tally.False, tally.Null)
+	}
+}
+
+func parseFormatString(s string) (format string) {
+	replacements := []struct {
+		old string
+		new string
+	}{
+		{"YYYY", "2006"},
+		{"YYY", "006"},
+		{"YY", "06"},
+		{"MM", "01"},
+		{"DD", "02"},
+		{"hh", "15"},
+		{"mm", "04"},
+		{"ss", "05"},
+	}
+	switch s {
+	case "long":
+		return "2006-01-02 15:04:05"
+	case "short":
+		return "15:04:05"
+	case "unix":
+		return time.UnixDate
+	case "rfc3339":
+		return time.RFC3339
+	}
+	format = s
+	for _, repl := range replacements {
+		format = strings.Replace(format, repl.old, repl.new, 1)
+	}
+	return
+}
+
+func printSealers(sealers []bfa.Address) {
+	bfa.SortAddresses(sealers)
+	if json {
+		util.PrintJson(sealers)
+	} else {
+		for _, sealer := range sealers {
+			fmt.Println(sealer.Hex())
+		}
+	}
+}
+
+func weiTo(wei *big.Int, unit string) (value *big.Float, ok bool) {
+	divisor, ok := units[unit]
+	if ok {
+		w := new(big.Float).SetInt(wei)
+		value = w.Quo(w, divisor)
+	}
+	return
+}
+
+func sealers() {
+	var (
+		blockNumber  int64
+		lastBlock    bool
+		timestamp    bool
+		difficulty   bool
+		balance      bool
+		header       bool
+		format       string
+		formatStr    string
+		headerFmt    string
+		unit         string
+		list         []bfa.Address
+		lastBlockLen int64
+		timestampLen int64
+		balanceLen   int64
+	)
+	description = "Presenta la lista de selladores. Opcionalmente presenta información sobre los selladores."
+	setFlags()
+	flags.Int64Var(&blockNumber, "block-number", latest, "Número del bloque en el cual se quiere conocer la lista de selladores (-1 para el último)")
+	flags.BoolVar(&lastBlock, "last-block", false, "Muestra el último bloque sellado por cada sellador, o 0 si un nodo no ha sellado en las últimas 5 rondas.")
+	flags.BoolVar(&timestamp, "timestamp", false, "Muestra el timestamp del sellado.")
+	flags.BoolVar(&difficulty, "difficulty", false, "Muestra la dificultad del sellado (1: fuera de turno, 2: en turno).")
+	flags.BoolVar(&balance, "balance", false, "Muestra el saldo del sellador (en Wei).")
+	flags.BoolVar(&header, "header", false, "Muestra un encabezado en cada columna.")
+	flags.StringVar(&format, "format", "", "Formato del timestamp. Ignorado en formato json. Opciones: 'unix', 'rfc3339', 'long' ('YYYY-MM-DD hh:mm:ss'), 'short' ('hh:mm:ss') o un formato específico. Ejemplo 'DD/MM/YY hh.mm.ss'. También se admite el formato del paquete 'time' de go.")
+	flags.StringVar(&formatStr, "output-format", "", "Formato de la salida. Ignorado en formato json. Es una string en la que se reemplazan las ocurrencias de {sealer}, {last-block}, {timestamp}, {difficulty} y {balance} por sus respectivos valores.")
+	flags.StringVar(&unit, "unit", "wei", "Unidades en la que se expresa el balance. Posibles valores: wei, Kwei, kilowei, Mwei, megawei, Gwei, gigawei, microether, milliether, ether, babbage, lovelace, shannon, szabo, finney.")
+	parseFlags(false)
+	if blockNumber == 0 {
+		util.Error("El bloque génesis no tiene firmantes\n")
+	}
+	unit = strings.ToLower(unit)
+	if _, ok := units[unit]; !ok {
+		util.Error("Unidad '%v' desconocida\n", unit)
+	}
+	url = updateURL(url)
+	node, err := bfa.Dial(url)
+	util.Check(err)
+	defer node.Close()
+	blockNumber = node.BlockNumberInRange(blockNumber)
+	extended := lastBlock || timestamp || difficulty || balance || len(formatStr) > 0
+
+	if !extended {
+		printSealers(node.SealersAtBlock(blockNumber))
+		return
+	}
+
+	sealers := node.SealersStatus(blockNumber)
+	if json {
+		util.PrintJson(sealers)
+		return
+	}
+
+	if len(format) > 0 {
+		format = parseFormatString(format)
+		timestampLen = int64(len(format))
+	} else {
+		timestampLen = 10
+	}
+
+	for sealer := range sealers {
+		list = append(list, sealer)
+	}
+	if formatStr != "" {
+		bfa.SortAddresses(list)
+		formatStr = strings.Replace(formatStr, "%", "%%", -1)
+		formatStr = strings.Replace(formatStr, "{sealer}", "%[1]v", -1)
+		formatStr = strings.Replace(formatStr, "{last-block}", "%[3]v", -1)
+		formatStr = strings.Replace(formatStr, "{timestamp}", "%[5]v", -1)
+		formatStr = strings.Replace(formatStr, "{difficulty}", "%[6]v", -1)
+		formatStr = strings.Replace(formatStr, "{balance}", "%[8]v", -1)
+	} else {
+		switch {
+		case lastBlock:
+			sort.Slice(list, func(i, j int) bool { return sealers[list[i]].LastBlock > sealers[list[j]].LastBlock })
+		case timestamp:
+			sort.Slice(list, func(i, j int) bool { return sealers[list[i]].Time > sealers[list[j]].Time })
+		case difficulty:
+			sort.Slice(list, func(i, j int) bool { return sealers[list[i]].Difficulty > sealers[list[j]].Difficulty })
+		case balance:
+			sort.Slice(list, func(i, j int) bool { return sealers[list[i]].Balance.Cmp(sealers[list[j]].Balance.Int) > 0 })
+		}
+		formatStr = "%42v"
+		if lastBlock {
+			formatStr += " %[2]*[3]v"
+			lastBlockLen = util.Max(2, int64(len(strconv.FormatInt(sealers[list[0]].LastBlock, 10))))
+		}
+		if timestamp {
+			formatStr += " %[4]*[5]v"
+		}
+		if difficulty {
+			formatStr += " %2[6]v"
+		}
+		headerFmt = formatStr
+		if balance {
+			formatStr += " %#12.6[8]e"
+			headerFmt += " %[7]*[8]v"
+			balanceLen = 12
+		}
+		if header {
+			headerFmt += "\n"
+			fmt.Printf(headerFmt,
+				fmt.Sprintf("%-24v", "Sealer"),
+				lastBlockLen, fmt.Sprintf("%*v", -lastBlockLen/2-2, "Last"),
+				timestampLen, fmt.Sprintf("%*v", -timestampLen/2-2, "Time"),
+				"Dif",
+				balanceLen, fmt.Sprintf("%*v", -(int(balanceLen)+len(unit))/2-1, strings.Title(unit)))
+		}
+	}
+	formatStr += "\n"
+	for _, sealer := range list {
+		var formatedTimestamp interface{}
+
+		s := sealers[sealer]
+		t := int64(s.Time)
+		formatedTimestamp = t
+		if len(format) > 0 && t > 0 {
+			formatedTimestamp = time.Unix(t, 0).Format(format)
+		}
+		convertedBalance, _ := weiTo(s.Balance.Int, unit)
+		fmt.Printf(formatStr, sealer.Hex(), lastBlockLen, s.LastBlock, timestampLen, formatedTimestamp, s.Difficulty, balanceLen, convertedBalance)
+	}
+}
+
+func autovote() {
+	var (
+		removedSealers = 0
+		threshold      = voteThreshold
+		voted          = make(map[string]bool)
+	)
+	description = fmt.Sprintf(`Vota automáticamente en todas las propuestas activas, en el sentido que corresponda, con ciertas restricciones.
+  - No deja votar si el voto puede reducir la cantidad de selladores a menos de %v.
+  - No permite eliminar a los selladores establecidos en el bloque génesis.
+  - Requiere que la propuesta tenga al menos %v votos.
+  - No permite votar para eliminarse a uno mismo de la lista de selladores.`, minSigners, threshold)
+	flags.IntVar(&threshold, "threshold", voteThreshold, "Cantidad mínima de votos en una propuesta para habilitar el voto automático.")
+	setFlags()
+	parseFlags(false)
+	util.Ensure(threshold >= voteThreshold, "No se puede especificar una cantidad de votos inferior a %v.", voteThreshold)
+	url = updateURL(url)
+	node, err := bfa.Dial(url)
+	util.Check(err)
+	defer node.Close()
+	util.Ensure(node.IsSealer(bfa.Self), "Solo los selladores pueden votar")
+	votes := node.Votes(latest)
+	genesisSigners := node.SealersAtBlock(0)
+	self, err := node.Coinbase()
+	util.Check(err)
+	for _, tally := range votes.Tally {
+		if tally.False >= threshold { // We are trying to remove a sealer
+			removedSealers++
+		}
+	}
+	util.Ensure(len(votes.Signers)-removedSealers >= minSigners, "No se puede emitir un voto automático que reduzca la cantidad de selladores por debajo de %v.", minSigners)
+	for _, proposal := range votes.Proposals {
+		isSealer := proposal.In(votes.Signers)
+		switch {
+		case votes.Votes[proposal][self] != nil:
+			continue // Already voted
+		case isSealer && votes.Tally[proposal].False < threshold:
+			continue // There aren't enough votes to enable autovote
+		case !isSealer && votes.Tally[proposal].True < threshold:
+			continue // There aren't enough votes to enable autovote
+		case proposal.In(genesisSigners) && isSealer:
+			log.Printf("No se puede quitar en forma automática a un sellador del bloque génesis: %v.\n", proposal)
+			continue
+		case proposal == self:
+			log.Println("No se puede votar para eliminarse uno mismo de la lista de selladores.")
+			continue
+		}
+		node.Propose(proposal, !isSealer)
+		if json {
+			voted[proposal.String()] = !isSealer
+		} else {
+			fmt.Printf("Voto por %v: %v\n", proposal, !isSealer)
+		}
+	}
+	if json {
+		util.PrintJson(voted)
+	}
+}
+
+func propose() {
+	var (
+		authorize bool
+		voted     = make(map[string]bool)
+	)
+	description = "Vota por una propuesta."
+	otherArgs = "[propuesta...]"
+	setFlags()
+	flags.BoolVar(&authorize, "authorize", true, "Sentido del voto (true: a favor, false: en contra).")
+	parseFlags(true)
+	url = updateURL(url)
+	node, err := bfa.Dial(url)
+	util.Check(err)
+	defer node.Close()
+	util.Ensure(node.IsSealer(bfa.Self), "Solo los selladores pueden votar")
+	votes := node.Votes(latest)
+	util.Ensure(flags.NArg() > 0, "No se especificaron candidatos por los cuales votar\n")
+	for i := 0; i < flags.NArg(); i++ {
+		addr := flags.Arg(i)
+		util.Ensure(util.IsValidAddress(addr), "'%v' no es una dirección válida\n", addr)
+		address := bfa.HexToAddress(addr)
+		if _, ok := votes.Tally[address]; !ok {
+			isSealer := address.In(votes.Signers)
+			switch { // address is not in a proposal, we only allow removing signers or adding non signers
+			case isSealer && authorize:
+				util.Error("'%v' ya es un sellador\n", address)
+			case !isSealer && !authorize:
+				util.Error("'%v' no es un sellador\n", address)
+			}
+		}
+		node.Propose(address, authorize)
+		if json {
+			voted[address.String()] = authorize
+		} else {
+			fmt.Printf("Voto por %v: %v\n", address, authorize)
+		}
+	}
+	if json {
+		util.PrintJson(voted)
+	}
+}
+
+func status() {
+	nodeStatus := struct {
+		Enode                   string                      `json:"enode"`
+		Network                 uint64                      `json:"network"`
+		Genesis                 string                      `json:"genesis"`
+		BFANetwork              string                      `json:"bfaNetwork"`
+		BFAGenesis              string                      `json:"bfaGenesis"`
+		Accounts                map[bfa.Address]*bfa.BigInt `json:"accounts"`
+		Coinbase                bfa.Address                 `json:"coinbase"`
+		IsSealer                bool                        `json:"isSealer"`
+		IsMining                bool                        `json:"isMining"`
+		BlockNumber             int64                       `json:"blockNumber"`
+		Time                    int64                       `json:"timestamp"`
+		DateTime                string                      `json:"datetime"`
+		LastBlockSigned         int64                       `json:"lastBlockSigned,omitempty"`
+		LastTimeSigned          int64                       `json:"lastTimeSigned,omitempty"`
+		DateTimeLastBlockSigned string                      `json:"datetimeLastSigned,omitempty"`
+		PeerCount               uint64                      `json:"peerCount"`
+	}{
+		Accounts: make(map[bfa.Address]*bfa.BigInt),
+	}
+	description = "Muestra el estado del nodo."
+	setFlags()
+	parseFlags(false)
+	url = updateURL(url)
+	node, err := bfa.Dial(url)
+	util.Check(err)
+	defer node.Close()
+	for _, account := range node.Accounts() {
+		nodeStatus.Accounts[account] = node.Balance(account)
+	}
+	nodeStatus.Coinbase, _ = node.Coinbase()
+	nodeStatus.BlockNumber = node.BlockNumber()
+	header := node.HeaderByNumber(nodeStatus.BlockNumber)
+	nodeStatus.Time = int64(header.Time)
+	nodeStatus.DateTime = time.Unix(nodeStatus.Time, 0).Format("2006-01-02 15:04:05")
+	nodeStatus.IsSealer = node.IsSealer(bfa.Self)
+	nodeStatus.IsMining = node.IsMining()
+	if nodeStatus.IsSealer {
+		nodeStatus.LastBlockSigned = node.LastBlockSignedBy(nodeStatus.Coinbase, nodeStatus.BlockNumber)
+		if nodeStatus.LastBlockSigned != 0 {
+			header := node.HeaderByNumber(nodeStatus.LastBlockSigned)
+			nodeStatus.LastTimeSigned = int64(header.Time)
+			nodeStatus.DateTimeLastBlockSigned = time.Unix(nodeStatus.LastTimeSigned, 0).Format("2006-01-02 15:04:05")
+		}
+	}
+	nodeInfo := node.NodeInfo()
+	nodeStatus.Enode = nodeInfo.Enode
+	ethInfo := nodeInfo.Protocols["eth"].(map[string]interface{})
+	nodeStatus.Genesis = ethInfo["genesis"].(string)
+	nodeStatus.Network = uint64(ethInfo["network"].(float64))
+	nodeStatus.BFAGenesis = bfa.Genesis(nodeStatus.Genesis).String()
+	nodeStatus.BFANetwork = bfa.Network(nodeStatus.Network).String()
+	nodeStatus.PeerCount = node.PeerCount()
+	util.PrintJson(nodeStatus)
+}
+
+func block() {
+	var (
+		blockNumber int64
+	)
+	description = "Presenta la lista de selladores. Opcionalmente indica el último bloque sellado por cada uno."
+	setFlags()
+	flags.Int64Var(&blockNumber, "block-number", latest, "Número del bloque en el cual se quiere conocer la lista de selladores (-1 para el último)")
+	parseFlags(false)
+	url = updateURL(url)
+	node, err := bfa.Dial(url)
+	util.Check(err)
+	defer node.Close()
+	blockNumber = node.BlockNumberInRange(blockNumber)
+	block := node.BlockByNumber(blockNumber)
+	util.PrintJson(block)
+}
+
+func snapshot() {
+	var blockNumber int64
+	description = "Muestra el snapshot en un bloque"
+	setFlags()
+	flags.Int64Var(&blockNumber, "block-number", latest, "Número del bloque en el cual se quiere conocer la lista de selladores (-1 para el último)")
+	parseFlags(false)
+	url = updateURL(url)
+	node, err := bfa.Dial(url)
+	util.Check(err)
+	defer node.Close()
+	blockNumber = node.BlockNumberInRange(blockNumber)
+	snapshot := node.SnapshotAtBlock(blockNumber)
+	util.PrintJson(snapshot)
+}
+
+func transfers() {
+	type Transfer struct {
+		From        bfa.Address `json:"from"`
+		To          bfa.Address `json:"to"`
+		Amount      *bfa.BigInt `json:"amount"`
+		BlockNumber int64       `json:"blockNumber"`
+	}
+	var (
+		first, last, end int64
+	)
+	description = "Muestra transferencias en un rango de bloques, y opcionalmente, restringidas a ciertas direcciones."
+	otherArgs = "[dirección...]"
+	setFlags()
+	flags.Int64Var(&first, "first-block", latest, "Primer bloque del rango (-1 para especificar el último bloque)")
+	flags.Int64Var(&last, "last-block", latest, "Último bloque del rango (-1 para especificar el último bloque)")
+	parseFlags(true)
+	url = updateURL(url)
+	node, err := bfa.Dial(url)
+	util.Check(err)
+	defer node.Close()
+	set := make(map[bfa.Address]bool)
+	txs := make([]Transfer, 0)
+	for i := 0; i < flags.NArg(); i++ {
+		address := flags.Arg(i)
+		util.Ensure(util.IsValidAddress(address), "'%v' no es una dirección válida\n", address)
+		set[bfa.HexToAddress(address)] = true
+	}
+	latest := node.BlockNumber()
+	if first < 0 {
+		first = latest
+	}
+	if last < 0 || last > latest {
+		end = latest + 1
+	} else {
+		end = last + 1
+	}
+	for first < end {
+		for i := first; i < end; i++ {
+			if node.BlockTransactionCount(i) > 0 {
+				block := node.BlockByNumber(i)
+				for _, transaction := range block.Transactions {
+					if !transaction.Value.IsZero() {
+						src := transaction.From
+						dst := transaction.To
+						if len(set) == 0 || set[src] || set[dst] {
+							if json {
+								txs = append(txs, Transfer{src, dst, transaction.Value, i})
+							} else {
+								fmt.Printf("%v -> %v: %v (%v)\n", src.Hex(), dst.Hex(), transaction.Value, transaction.BlockNumber)
+							}
+						}
+					}
+				}
+			}
+		}
+		first = end
+		if last < 0 || last > end {
+			latest = node.BlockNumber()
+			if latest < last {
+				end = latest + 1
+			} else {
+				end = last + 1
+			}
+		}
+	}
+	if json {
+		util.PrintJson(txs)
+	}
+}
+
+func sealerstats() {
+	type Stats struct {
+		FirstSeen        int64   `json:"first_seen,omitempty"`
+		LastSeen         int64   `json:"last_seen,omitempty"`
+		FirstBlockSealed int64   `json:"first_block_sealed,omitempty"`
+		LastBlockSealed  int64   `json:"last_block_sealed,omitempty"`
+		BlocksSealed     int64   `json:"blocks_sealed"`
+		BlocksAlive      int64   `json:"blocks_alive"`
+		Availability     float64 `json:"availability"`
+		recent           bool
+	}
+	var (
+		first, last, end, lastBlock int64
+		sealerStats                 map[bfa.Address]*Stats
+	)
+	description = "Calcula estadísticas de los selladores."
+	setFlags()
+	flags.Int64Var(&first, "first-block", 1, "Primer bloque del rango (Número negativo para restar del último bloque)")
+	flags.Int64Var(&last, "last-block", latest, "Último bloque del rango (-1 para especificar el último bloque)")
+	parseFlags(true)
+	url = updateURL(url)
+	node, err := bfa.Dial(url)
+	util.Check(err)
+	defer node.Close()
+	sealerStats = make(map[bfa.Address]*Stats)
+	latest := node.BlockNumber()
+	if last < 0 || last > latest {
+		last = latest
+	}
+	end = last + 1
+	if first <= 0 && first < last {
+		first = last + first
+	}
+	lastBlock = first - 1
+	first += int64(len(node.SnapshotAtBlock(first).Recents))
+	if first > last {
+		first = last
+	}
+	for first < end {
+		for sealer := range node.SnapshotAtBlock(end - 1).Signers {
+			if _, ok := sealerStats[sealer]; !ok {
+				sealerStats[sealer] = &Stats{}
+			}
+		}
+		for block := first; block < end; {
+			snapshot := node.SnapshotAtBlock(block)
+			recentsLength := int64(len(snapshot.Recents))
+			shouldHaveSealedAfter := block - 4*recentsLength
+			if shouldHaveSealedAfter < 0 {
+				shouldHaveSealedAfter = 0
+			}
+			if block-recentsLength > lastBlock {
+				fmt.Fprintln(os.Stderr, "Perdimos un sellador, retrocediendo")
+				block--
+				continue
+			}
+			var blocksProcessed int64 = 0
+			for blockNumber, sealer := range snapshot.Recents {
+				blockNumber := int64(blockNumber)
+				if blockNumber <= lastBlock {
+					continue
+				}
+				blocksProcessed++
+				if stats, ok := sealerStats[sealer]; ok {
+					// We are interested in this sealer
+					stats.LastBlockSealed = blockNumber
+					if stats.FirstBlockSealed == 0 {
+						stats.FirstBlockSealed = blockNumber
+					}
+					stats.BlocksSealed++
+					stats.recent = true
+				}
+			}
+			for sealer := range snapshot.Signers {
+				stats := sealerStats[sealer]
+				stats.LastSeen = block
+				var firstSeen bool
+				if stats.FirstSeen == 0 {
+					// we have never seen this sealer before
+					fmt.Fprintf(os.Stderr, "Nuevo sellador: %v\n", sealer.Hex())
+					stats.FirstSeen = block
+					firstSeen = true
+				}
+				if !stats.recent {
+					// sealer is not in snapshot.Recents
+					if stats.FirstBlockSealed > 0 {
+						// Sealer has signed at least once, we never zero its BlocksAlive
+						if stats.LastBlockSealed > shouldHaveSealedAfter {
+							stats.BlocksAlive += blocksProcessed
+							continue
+						}
+					} else if stats.FirstSeen <= shouldHaveSealedAfter {
+						// Sealer has never signed since we've seen it for the first time
+						stats.BlocksAlive = 0
+					} else if !firstSeen {
+						// Sealer has never signed, but only a few blocks have passed since we've seen it for the first time
+						// and we've seen it more than once
+						stats.BlocksAlive += blocksProcessed
+					} else {
+						stats.BlocksAlive = 1
+					}
+					continue
+				}
+				stats.recent = false
+				// sealer is in snapshot.Recents
+				if firstSeen {
+					stats.FirstSeen = stats.FirstBlockSealed
+					stats.BlocksAlive = block - stats.FirstSeen + 1
+				} else {
+					stats.BlocksAlive += blocksProcessed
+				}
+			}
+			lastBlock = block
+			block += recentsLength
+		}
+		first = end
+		if last < 0 || last > end {
+			latest = node.BlockNumber()
+			if latest < last {
+				end = latest + 1
+			} else {
+				end = last + 1
+			}
+		}
+	}
+	for _, stats := range sealerStats {
+		if stats.LastSeen == 0 {
+			continue
+		}
+		blocksSeen := stats.LastSeen - stats.FirstSeen + 1
+		stats.Availability = float64(stats.BlocksAlive) / float64(blocksSeen)
+	}
+	util.PrintJson(sealerStats)
+}
+
+func main() {
+	var (
+		commands = map[string]func(){
+			"proposals":   proposals,
+			"sealers":     sealers,
+			"vote":        propose,
+			"autovote":    autovote,
+			"status":      status,
+			"block":       block,
+			"snapshot":    snapshot,
+			"transfers":   transfers,
+			"sealerstats": sealerstats,
+		}
+		validCommands []string
+		command       func()
+	)
+	for cmd := range commands {
+		validCommands = append(validCommands, cmd)
+	}
+	sort.Strings(validCommands)
+	if len(os.Args) > 1 {
+		command = commands[os.Args[1]]
+	}
+	util.Ensure(command != nil, "Uso: %v <%v> [opciones]\nPara ayuda: %v <command> -h\n", path.Base(os.Args[0]), strings.Join(validCommands, "|"), path.Base(os.Args[0]))
+	command()
+}

go.mod

+module gitlab.bfa.ar/miguel/bfa
+
+go 1.15
+
+require github.com/ethereum/go-ethereum v1.9.23

go.sum

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+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/urfave/cli.v1 v1.20.0/go.mod h1:vuBzUtMdQeixQj8LVd+/98pzhxNGQoyuPBlsXHOQNO0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=

internal/bfa/address.go

+package bfa
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"sort"
+)
+
+type Address struct{ common.Address }
+
+func (address Address) MarshalText() ([]byte, error) {
+	return []byte(address.Hex()), nil
+}
+
+func (a Address) LessThan(b Address) bool {
+	for i, x := range a.Address {
+		if x >= b.Address[i] {
+			return false
+		}
+	}
+	return true
+}
+
+func (address Address) In(slice []Address) bool {
+	for _, x := range slice {
+		if x == address {
+			return true
+		}
+	}
+	return false
+}
+
+func SortAddresses(slice []Address) {
+	sort.Slice(slice, func(i int, j int) bool { return slice[i].LessThan(slice[j]) })
+}
+
+func HexToAddress(s string) (address Address) {
+	address = Address{common.HexToAddress(s)}
+	return
+}

internal/bfa/block.go

+package bfa
+
+import (
+	"bytes"
+	"encoding/hex"
+	"errors"
+	"math/big"
+	"strconv"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/rlp"
+	"gitlab.bfa.ar/miguel/bfa/internal/util"
+)
+
+type BigInt struct {
+	*big.Int
+}
+
+func (bigInt *BigInt) UnmarshalJSON(b []byte) error {
+	if i, ok := new(big.Int).SetString(string(b[1:len(b)-1]), 0); ok {
+		*bigInt = BigInt{i}
+		return nil
+	}
+	return errors.New("can't unmarshal BigInt")
+
+}
+
+func (bigInt *BigInt) IsZero() bool {
+	return bigInt.BitLen() == 0
+}
+
+type Uint64 uint64
+
+func (u *Uint64) UnmarshalJSON(b []byte) (err error) {
+	i, err := strconv.ParseUint(string(b[1:len(b)-1]), 0, 64)
+	*u = Uint64(i)
+	return
+}
+
+type Bytes []byte
+
+func (b Bytes) MarshalJSON() ([]byte, error) {
+	dest := make([]byte, 2+hex.EncodedLen(len(b)))
+	copy(dest, []byte("\"0x"))
+	hex.Encode(dest[2:], b)
+	dest[len(dest)-1] = '"'
+	return dest, nil
+}
+
+func (b *Bytes) UnmarshalJSON(src []byte) (err error) {
+	util.Require(len(src) >= 4 && bytes.Equal(src[1:3], []byte("0x")), "invalid json string")
+	dest := make([]byte, hex.DecodedLen(len(src)-4))
+	_, err = hex.Decode(dest, src[3:len(src)-1])
+	if err == nil {
+		*b = dest
+	}
+	return
+}
+
+// RPCTransaction represents a transaction
+type RPCTransaction struct {
+	BlockHash        common.Hash `json:"blockHash"`
+	BlockNumber      Uint64      `json:"blockNumber"`
+	From             Address     `json:"from"`
+	Gas              Uint64      `json:"gas"`
+	GasPrice         *BigInt     `json:"gasPrice"`
+	Hash             common.Hash `json:"hash"`
+	Input            string      `json:"input"`
+	Nonce            Uint64      `json:"nonce"`
+	To               Address     `json:"to"`
+	TransactionIndex Uint64      `json:"transactionIndex"`
+	Value            *BigInt     `json:"value"`
+	V                *BigInt     `json:"v"`
+	R                *BigInt     `json:"r"`
+	S                *BigInt     `json:"s"`
+}
+
+type Header struct {
+	ParentHash  common.Hash      `json:"parentHash"`
+	UncleHash   common.Hash      `json:"sha3Uncles"`
+	Coinbase    Address          `json:"miner"`
+	Root        common.Hash      `json:"stateRoot"`
+	TxHash      common.Hash      `json:"transactionsRoot"`
+	ReceiptHash common.Hash      `json:"receiptsRoot"`
+	Bloom       types.Bloom      `json:"logsBloom"`
+	Difficulty  *BigInt          `json:"difficulty"`
+	Number      *BigInt          `json:"number"`
+	GasLimit    Uint64           `json:"gasLimit"`
+	GasUsed     Uint64           `json:"gasUsed"`
+	Time        Uint64           `json:"timestamp"`
+	Extra       Bytes            `json:"extraData"`
+	MixDigest   common.Hash      `json:"mixHash"`
+	Nonce       types.BlockNonce `json:"nonce"`
+}
+
+func (header *Header) ExtraWithoutSignature() []byte {
+	return header.Extra[:len(header.Extra)-65]
+}
+
+func (header *Header) Signature() []byte {
+	return header.Extra[len(header.Extra)-65:]
+}
+
+func (header *Header) ethHeader() *types.Header {
+	var h types.Header
+	h.ParentHash = header.ParentHash
+	h.UncleHash = header.UncleHash
+	h.Coinbase = header.Coinbase.Address
+	h.Root = header.Root
+	h.TxHash = header.TxHash
+	h.ReceiptHash = header.ReceiptHash
+	h.Bloom = header.Bloom
+	h.Difficulty = header.Difficulty.Int
+	h.Number = header.Number.Int
+	h.GasLimit = uint64(header.GasLimit)
+	h.GasUsed = uint64(header.GasUsed)
+	h.Time = uint64(header.Time)
+	h.Extra = header.Extra
+	h.MixDigest = header.MixDigest
+	h.Nonce = header.Nonce
+	return &h
+}
+
+func (header *Header) GetSigner() Address {
+	return getSigner(header.ethHeader())
+}
+
+func (header *Header) GetHash() (h common.Hash) {
+	headerBytes, _ := rlp.EncodeToBytes(header.ethHeader())
+	return crypto.Keccak256Hash(headerBytes)
+}
+
+type Block struct {
+	Header
+	Transactions    []RPCTransaction `json:"transactions"`
+	TotalDifficulty Uint64           `json:"totalDifficulty"`
+	Signer          Address          `json:"signer"`
+	Hash            common.Hash      `json:"hash"`
+}

internal/bfa/clique.go

+package bfa
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/rlp"
+)
+
+func sigHash(header *types.Header) (hash common.Hash) {
+	headerBytes, _ := rlp.EncodeToBytes([]interface{}{
+		header.ParentHash,
+		header.UncleHash,
+		header.Coinbase,
+		header.Root,
+		header.TxHash,
+		header.ReceiptHash,
+		header.Bloom,
+		header.Difficulty,
+		header.Number,
+		header.GasLimit,
+		header.GasUsed,
+		header.Time,
+		header.Extra[:len(header.Extra)-65], // Yes, this will panic if extra is too short
+		header.MixDigest,
+		header.Nonce,
+	})
+	return crypto.Keccak256Hash(headerBytes)
+}
+
+func getSigner(header *types.Header) (address Address) {
+	if header.Number.Int64() == 0 { // Genesis block has no signers, we return an empty address
+		return
+	}
+	hash := sigHash(header).Bytes()
+	pubkey, err := crypto.Ecrecover(hash, header.Extra[len(header.Extra)-65:])
+	if err != nil {
+		panic(err)
+	}
+	copy(address.Address[:], crypto.Keccak256(pubkey[1:])[12:])
+	return
+}

internal/bfa/node.go

+package bfa
+
+import (
+	"strconv"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/consensus/clique"
+	"github.com/ethereum/go-ethereum/p2p"
+	"github.com/ethereum/go-ethereum/rpc"
+	. "gitlab.bfa.ar/miguel/bfa/internal/util"
+)
+
+type Node rpc.Client
+
+type Network int
+type Genesis string
+
+type Vote struct {
+	Signer    Address `json:"signer"`    // Authorized signer that cast this vote
+	Block     uint64  `json:"block"`     // Block number the vote was cast in (expire old votes)
+	Address   Address `json:"address"`   // Account being voted on to change its authorization
+	Authorize bool    `json:"authorize"` // Whether to authorize or deauthorize the voted account
+}
+
+type Snapshot struct {
+	Number  uint64                   `json:"number"`  // Block number where the snapshot was created
+	Hash    common.Hash              `json:"hash"`    // Block hash where the snapshot was created
+	Signers map[Address]struct{}     `json:"signers"` // Set of authorized signers at this moment
+	Recents map[uint64]Address       `json:"recents"` // Set of recent signers for spam protections
+	Votes   []Vote                   `json:"votes"`   // List of votes cast in chronological order
+	Tally   map[Address]clique.Tally `json:"tally"`   // Current vote tally to avoid recalculating
+}
+
+type Tally struct {
+	True  int `json:"true"`
+	False int `json:"false"`
+	Null  int `json:"null"`
+}
+
+type Proposals struct {
+	BlockNumber int64                         `json:"number"`    // Block number where the snapshot was created
+	Proposals   []Address                     `json:"proposals"` // List of proposals being voted
+	Signers     []Address                     `json:"signers"`   // List of authorized signers at this moment
+	Tally       map[Address]*Tally            `json:"tally"`     // Count of positive, negative and empty votes for a proposal
+	Votes       map[Address]map[Address]*bool `json:"votes"`     // List of votes for each proposal
+}
+
+type SealerStatus struct {
+	LastBlock  int64   `json:"lastBlockSigned"`
+	Time       uint64  `json:"timestamp"`
+	Difficulty uint64  `json:"difficulty"`
+	Balance    *BigInt `json:"balance"`
+}
+
+const (
+	Latest               = "latest"
+	MainNetwork  Network = 47525974938
+	MainGenesis  Genesis = "0xe0e26f415af00fe32e1e8d94336355db43a78d9f59eb70910172b61fb670d99e"
+	TestNetwork  Network = 55555000000
+	TestGenesis  Genesis = "0x67e3e0fe207bd536875c14293132029b2cbf72aeb47afa865c2262293bca7d58"
+	SealerRounds         = 2
+)
+
+func (network Network) String() string {
+	switch network {
+	case MainNetwork:
+		return "main"
+	case TestNetwork:
+		return "test"
+	default:
+		return "unknown"
+	}
+}
+
+func (genesis Genesis) String() string {
+	switch genesis {
+	case MainGenesis:
+		return "main"
+	case TestGenesis:
+		return "test"
+	default:
+		return "unknown"
+	}
+}
+
+var Self = Address{} // Empty address to represent the address of the caller
+
+func (node *Node) Call(result interface{}, method string, args ...interface{}) {
+	Check((*rpc.Client)(node).Call(result, method, args...))
+}
+
+func (node *Node) CallWithError(result interface{}, method string, args ...interface{}) error {
+	return (*rpc.Client)(node).Call(result, method, args...)
+}
+
+func (node *Node) BlockNumber() int64 {
+	var bn rpc.BlockNumber
+	node.Call(&bn, "eth_blockNumber")
+	return bn.Int64()
+}
+
+func (node *Node) GasPrice() (gp int64) {
+	node.Call(&gp, "eth_gasPrice")
+	return gp
+}
+
+func (node *Node) Accounts() (accounts []Address) {
+	node.Call(&accounts, "eth_accounts")
+	return
+}
+
+func (node *Node) IsMining() (mining bool) {
+	node.Call(&mining, "eth_mining")
+	return
+}
+
+func (node *Node) PeerCount() uint64 {
+	var peerCount Uint64
+	node.Call(&peerCount, "net_peerCount")
+	return uint64(peerCount)
+}
+
+func (node *Node) BalanceAtBlock(account Address, blockNumber int64) *BigInt {
+	var balance BigInt
+	node.Call(&balance, "eth_getBalance", account, hexBlockNumber(blockNumber))
+	return &balance
+}
+
+func (node *Node) Balance(account Address) *BigInt {
+	return node.BalanceAtBlock(account, -1)
+}
+
+func (node *Node) Coinbase() (address Address, err error) {
+	err = node.CallWithError(&address, "eth_coinbase")
+	return
+}
+
+func (node *Node) BlockNumberInRange(number int64) (blockNumber int64) {
+	latest := node.BlockNumber()
+	switch {
+	case number == -1, number > latest:
+		blockNumber = latest
+	case number < 0:
+		blockNumber = Max(0, latest+1+number)
+	default:
+		blockNumber = number
+	}
+	return
+}
+
+func (node *Node) HeaderByNumber(blockNumber int64) (header Header) {
+	node.Call(&header, "eth_getBlockByNumber", hexBlockNumber(blockNumber), false)
+	return
+}
+
+func (node *Node) HeaderByHash(hash common.Hash) (header Header) {
+	node.Call(&header, "eth_getBlockByHash", hash, false)
+	return
+}
+
+func (node *Node) BlockByNumber(blockNumber int64) (block Block) {
+	node.Call(&block, "eth_getBlockByNumber", hexBlockNumber(blockNumber), true)
+	block.Signer = block.GetSigner()
+	block.Hash = block.GetHash()
+	return
+}
+
+func (node *Node) BlockByHash(hash common.Hash) (block Block) {
+	node.Call(&block, "eth_getBlockByHash", hash, true)
+	block.Signer = block.GetSigner()
+	block.Hash = block.GetHash()
+	return
+}
+
+func (node *Node) BlockTransactionCount(blockNumber int64) (count int64) {
+	var num hexutil.Uint64
+	node.Call(&num, "eth_getBlockTransactionCountByNumber", hexBlockNumber(blockNumber))
+	return int64(num)
+}
+
+func (node *Node) BlockSigner(blockNumber int64) (signer Address) {
+	if blockNumber == 0 { // we return an empty signer for genesis block
+		return
+	}
+	header := node.HeaderByNumber(blockNumber)
+	return header.GetSigner()
+}
+
+func (node *Node) GetSnapshot() (snapshot Snapshot) {
+	node.Call(&snapshot, "clique_getSnapshot", nil)
+	return
+}
+
+func (node *Node) SnapshotAtBlock(blockNumber int64) (snapshot Snapshot) {
+	node.Call(&snapshot, "clique_getSnapshot", hexBlockNumber(blockNumber))
+	return
+}
+
+func (node *Node) Sealers() (signers []Address) {
+	node.Call(&signers, "clique_getSigners", nil)
+	return
+}
+
+func (node *Node) NodeInfo() (nodeInfo p2p.NodeInfo) {
+	node.Call(&nodeInfo, "admin_nodeInfo", nil)
+	return
+}
+
+func (node *Node) SealersAtBlock(blockNumber int64) (signers []Address) {
+	if blockNumber == -1 {
+		return node.Sealers()
+	}
+	node.Call(&signers, "clique_getSigners", Int64ToHex(blockNumber))
+	return
+}
+
+func (node *Node) IsSealer(address Address) bool {
+	if address == Self {
+		var (
+			err error
+		)
+		if address, err = node.Coinbase(); err != nil {
+			return false
+		}
+	}
+	return address.In(node.Sealers())
+}
+
+func (node *Node) IsSealerAtBlock(address Address, blockNumber int64) bool {
+	if address == Self {
+		var (
+			err error
+		)
+		if address, err = node.Coinbase(); err != nil {
+			return false
+		}
+	}
+	return address.In(node.SealersAtBlock(blockNumber))
+}
+
+func (node *Node) Propose(address Address, vote bool) {
+	node.Call(nil, "clique_propose", address.String(), vote)
+	return
+}
+
+func (node *Node) Votes(blockNumber int64) (votes Proposals) {
+	var (
+		snapshot Snapshot
+	)
+	if blockNumber < 0 {
+		snapshot = node.GetSnapshot()
+	} else {
+		snapshot = node.SnapshotAtBlock(blockNumber)
+	}
+	votes.BlockNumber = int64(snapshot.Number)
+	for signer := range snapshot.Signers {
+		votes.Signers = append(votes.Signers, signer)
+	}
+	SortAddresses(votes.Signers)
+	for proposal := range snapshot.Tally {
+		votes.Proposals = append(votes.Proposals, proposal)
+	}
+	SortAddresses(votes.Proposals)
+	votes.Votes = make(map[Address]map[Address]*bool)
+	votes.Tally = make(map[Address]*Tally)
+	for _, v := range snapshot.Votes {
+		proposal := v.Address
+		signer := v.Signer
+		if votes.Votes[proposal] == nil {
+			votes.Votes[proposal] = make(map[Address]*bool)
+			for _, signer := range votes.Signers {
+				votes.Votes[proposal][signer] = nil
+			}
+			votes.Tally[proposal] = &Tally{0, 0, len(votes.Signers)}
+		}
+		votes.Votes[proposal][signer] = &v.Authorize
+		if v.Authorize {
+			votes.Tally[proposal].True += 1
+		} else {
+			votes.Tally[proposal].False += 1
+		}
+		votes.Tally[proposal].Null -= 1
+	}
+	return
+}
+
+func (node *Node) LastBlockSignedBy(address Address, upperLimit int64) (blockNumber int64) {
+	if upperLimit == 0 || !node.IsSealer(address) {
+		return
+	}
+	for i := 0; i < 5; i++ {
+		snapshot := node.SnapshotAtBlock(upperLimit)
+		for number, sealer := range snapshot.Recents {
+			if sealer == address {
+				return int64(number)
+			}
+		}
+		upperLimit = int64(snapshot.Number) - int64((len(snapshot.Recents)))
+		if upperLimit <= 0 {
+			return
+		}
+	}
+	return
+}
+
+func (node *Node) SealersStatus(blockNumber int64) (status map[Address]*SealerStatus) {
+	if blockNumber == 0 { // Genesis block doesn't have signer
+		return
+	}
+	status = make(map[Address]*SealerStatus)
+	for _, address := range node.SealersAtBlock(blockNumber) {
+		status[address] = &SealerStatus{
+			Balance: node.BalanceAtBlock(address, blockNumber),
+		}
+	}
+	notSeen := int64(len(status))
+	block := node.HeaderByNumber(blockNumber)
+	blockNumber = block.Number.Int64()
+	until := Max(1, blockNumber-SealerRounds*notSeen)
+	for notSeen > 0 {
+		signer := block.GetSigner()
+		if status[signer].LastBlock == 0 {
+			status[signer].LastBlock = block.Number.Int64()
+			status[signer].Time = uint64(block.Time)
+			status[signer].Difficulty = block.Difficulty.Uint64()
+			notSeen--
+		}
+		if blockNumber == until {
+			break
+		}
+		blockNumber--
+		block = node.HeaderByNumber(blockNumber)
+	}
+	return status
+}
+
+func Dial(url string) (*Node, error) {
+	client, err := rpc.Dial(url)
+	return (*Node)(client), err
+}
+
+func (node *Node) Close() {
+	(*rpc.Client)(node).Close()
+}
+
+func hexBlockNumber(number int64) (blockNumber string) {
+	if number == -1 {
+		blockNumber = Latest
+	} else {
+		blockNumber = "0x" + strconv.FormatInt(number, 16)
+	}
+	return
+}

internal/bfa/node_test.go

+package bfa
+
+import (
+	"flag"
+	"github.com/ethereum/go-ethereum/common"
+	"log"
+	"os"
+	"testing"
+)
+
+const (
+	NumBlocks int64 = 1000
+)
+
+var (
+	node    *Node
+	numbers map[string]int64
+	hashes  map[string][]common.Hash
+)
+
+func BenchmarkBlockByNumber(b *testing.B) {
+	for r, base := range numbers {
+		b.Run(r, func(b *testing.B) {
+			for i := int64(0); i < int64(b.N); i++ {
+				_ = node.BlockByNumber(base + i%NumBlocks)
+			}
+		})
+	}
+}
+
+func BenchmarkHeaderByNumber(b *testing.B) {
+	for r, base := range numbers {
+		b.Run(r, func(b *testing.B) {
+			for i := int64(0); i < int64(b.N); i++ {
+				_ = node.HeaderByNumber(base + i%NumBlocks)
+			}
+		})
+	}
+}
+
+func BenchmarkBlockByHash(b *testing.B) {
+	for r := range numbers {
+		b.Run(r, func(b *testing.B) {
+			for i := int64(0); i < int64(b.N); i++ {
+				_ = node.BlockByHash(hashes[r][i%NumBlocks])
+			}
+		})
+	}
+}
+
+func BenchmarkHeaderByHash(b *testing.B) {
+	for r := range numbers {
+		b.Run(r, func(b *testing.B) {
+			for i := int64(0); i < int64(b.N); i++ {
+				_ = node.HeaderByHash(hashes[r][i%NumBlocks])
+			}
+		})
+	}
+}
+
+func (node *Node) getBlocksByNumber(last int64, n int64) int64 {
+	block := node.BlockByNumber(last)
+	for i := int64(0); i < n; i++ {
+		block = node.BlockByNumber(block.Number.Int64() - 1)
+	}
+	return block.Number.Int64()
+}
+
+func (node *Node) getBlocksByHash(last int64, n int64) int64 {
+	block := node.BlockByNumber(last)
+	for i := int64(0); i < n; i++ {
+		block = node.BlockByHash(block.ParentHash)
+	}
+	return block.Number.Int64()
+}
+
+func (node *Node) getHeadersByNumber(last int64, n int64) int64 {
+	header := node.HeaderByNumber(last)
+	for i := int64(0); i < n; i++ {
+		header = node.HeaderByNumber(header.Number.Int64() - 1)
+	}
+	return header.Number.Int64()
+}
+
+func (node *Node) getHeadersByHash(last int64, n int64) int64 {
+	header := node.HeaderByNumber(last)
+	for i := int64(0); i < n; i++ {
+		header = node.HeaderByHash(header.ParentHash)
+	}
+	return header.Number.Int64()
+}
+
+func TestBlockGetters(t *testing.T) {
+	latest := node.BlockNumber()
+	if latest < NumBlocks {
+		t.Skip("No hay suficientes bloques")
+	}
+	t.Run("BlockByNumber", func(t *testing.T) {
+		if node.getBlocksByNumber(latest, NumBlocks) != latest-NumBlocks {
+			t.Fail()
+		}
+	})
+	t.Run("BlockByHash", func(t *testing.T) {
+		if node.getBlocksByHash(latest, NumBlocks) != latest-NumBlocks {
+			t.Fail()
+		}
+	})
+}
+
+func TestHeaderGetters(t *testing.T) {
+	latest := node.BlockNumber()
+	if latest < NumBlocks {
+		t.Skip("No hay suficientes bloques")
+	}
+	t.Run("HeaderByNumber", func(t *testing.T) {
+		if node.getHeadersByNumber(latest, NumBlocks) != latest-NumBlocks {
+			t.Fail()
+		}
+	})
+	t.Run("HeaderByHash", func(t *testing.T) {
+		if node.getHeadersByHash(latest, NumBlocks) != latest-NumBlocks {
+			t.Fail()
+		}
+	})
+}
+
+func BenchmarkBlockGetters(b *testing.B) {
+	latest := node.BlockNumber()
+	if latest < NumBlocks {
+		b.Skip("No hay suficientes bloques")
+	}
+	b.Run("BlockByNumber", func(b *testing.B) {
+		for i := int64(0); i < int64(b.N); i++ {
+			_ = node.getBlocksByNumber(latest, NumBlocks)
+		}
+	})
+	b.Run("BlockByHash", func(b *testing.B) {
+		for i := int64(0); i < int64(b.N); i++ {
+			_ = node.getBlocksByHash(latest, NumBlocks)
+		}
+	})
+}
+
+func BenchmarkHeaderGetters(b *testing.B) {
+	latest := node.BlockNumber()
+	if latest < NumBlocks {
+		b.Skip("No hay suficientes bloques")
+	}
+	b.Run("HeaderByNumber", func(b *testing.B) {
+		for i := int64(0); i < int64(b.N); i++ {
+			_ = node.getHeadersByNumber(latest, NumBlocks)
+		}
+	})
+	b.Run("HeaderByHash", func(b *testing.B) {
+		for i := int64(0); i < int64(b.N); i++ {
+			_ = node.getHeadersByHash(latest, NumBlocks)
+		}
+	})
+}
+
+func TestMain(m *testing.M) {
+	flag.Parse()
+	var err error
+	if node, err = Dial("http://localhost:8545"); err != nil {
+		log.Fatal(err)
+	}
+	latest := node.BlockNumber()
+	if latest < 3*NumBlocks {
+		log.Fatal("No hay suficientes bloques como para correr benchmarks")
+	}
+	numbers = map[string]int64{"lo": 1, "mid": latest / 2, "hi": latest - NumBlocks}
+	hashes = make(map[string][]common.Hash)
+	for r, base := range numbers {
+		for i := int64(0); i < NumBlocks; i++ {
+			header := node.HeaderByNumber(base + 1)
+			hashes[r] = append(hashes[r], header.GetHash())
+		}
+	}
+	os.Exit(m.Run())
+
+}

internal/util/util.go

+package util
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/ethereum/go-ethereum/common"
+	"log"
+	"os"
+	"runtime"
+	"strconv"
+	"strings"
+)
+
+func Contains(slice []string, s string) bool {
+	for _, x := range slice {
+		if x == s {
+			return true
+		}
+	}
+	return false
+}
+
+func Error(format string, args ...interface{}) {
+	_, _ = fmt.Fprintf(os.Stderr, format, args...)
+	os.Exit(1)
+}
+
+func Ensure(condition bool, format string, args ...interface{}) {
+	if !condition {
+		Error(format, args...)
+	}
+}
+
+func Check(err error) {
+	Ensure(err == nil, "%v\n", err)
+}
+
+func Int64ToHex(n int64) string {
+	return "0x" + strconv.FormatInt(n, 16)
+}
+
+func Require(condition bool, msg string) {
+	if !condition {
+		ptr, _, _, _ := runtime.Caller(1)
+		log.Panicf("%v in %v", msg, runtime.FuncForPC(ptr).Name())
+	}
+}
+
+func Min(a, b int64) int64 {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+func Max(a, b int64) int64 {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+func PrintJson(s interface{}) {
+	v, err := json.MarshalIndent(s, "", "  ")
+	Check(err)
+	fmt.Println(string(v))
+	return
+}
+
+func isMixedCase(address string) bool {
+	return strings.ContainsAny(address, "abcdef") && strings.ContainsAny(address, "ABCDEF")
+}
+
+func IsValidAddress(address string) bool {
+	if !common.IsHexAddress(address) {
+		return false
+	}
+	if isMixedCase(address) {
+		return common.HexToAddress(address).Hex() == address
+	} else {
+		return true
+	}
+}

internal/util/util_test.go

+package util
+
+import (
+	"strings"
+	"testing"
+)
+
+var (
+	addresses = map[string]string{
+		"ValidReal":               "0x46991ada2a2544468eb3673524641bf293f23ccc",
+		"ValidSeq":                "0x000102030405060708090a0b0c0d0e0f10111213",
+		"ValidZero":               "0x0000000000000000000000000000000000000000",
+		"InvalidNoPrefix":         "0046991ada2a2544468eb3673524641bf293f23ccc",
+		"InvalidEmpty":            "",
+		"InvalidLengthVeryShort":  "0x",
+		"InvalidLengthShort":      "0x46991ada2a2544468eb3673524641bf293f23cc",
+		"InvalidLengthLong":       "0x46991ada2a2544468eb3673524641bf293f23ccc00",
+		"InvalidNoHexAtBeginning": "0xx6991ada2a2544468eb3673524641bf293f23ccc",
+		"InvalidNoHexAtEnd":       "0x46991ada2a2544468eb3673524641bf293f23ccx",
+	}
+)
+
+func TestValidAddress(t *testing.T) {
+	for name, address := range addresses {
+		t.Run(name, func(t *testing.T) {
+			if IsValidAddress(address) != strings.HasPrefix(name, "Valid") {
+				t.Fail()
+			}
+		})
+	}
+}
+
+func BenchmarkIsAddressTrue(b *testing.B) {
+	for name, address := range addresses {
+		b.Run(name, func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				_ = IsValidAddress(address)
+			}
+		})
+	}
+}