Official Go implementation of the Ethereum protocol
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go-ethereum/eth/api.go

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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package eth
import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"math/big"
"os"
"runtime"
"github.com/ethereum/ethash"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/miner"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/rpc"
)
// PublicEthereumAPI provides an API to access Ethereum full node-related
// information.
type PublicEthereumAPI struct {
e *Ethereum
}
// NewPublicEthereumAPI creates a new Etheruem protocol API for full nodes.
func NewPublicEthereumAPI(e *Ethereum) *PublicEthereumAPI {
return &PublicEthereumAPI{e}
}
// Etherbase is the address that mining rewards will be send to
func (s *PublicEthereumAPI) Etherbase() (common.Address, error) {
return s.e.Etherbase()
}
// Coinbase is the address that mining rewards will be send to (alias for Etherbase)
func (s *PublicEthereumAPI) Coinbase() (common.Address, error) {
return s.Etherbase()
}
// Hashrate returns the POW hashrate
func (s *PublicEthereumAPI) Hashrate() *rpc.HexNumber {
return rpc.NewHexNumber(s.e.Miner().HashRate())
}
// PublicMinerAPI provides an API to control the miner.
// It offers only methods that operate on data that pose no security risk when it is publicly accessible.
type PublicMinerAPI struct {
e *Ethereum
agent *miner.RemoteAgent
}
// NewPublicMinerAPI create a new PublicMinerAPI instance.
func NewPublicMinerAPI(e *Ethereum) *PublicMinerAPI {
agent := miner.NewRemoteAgent()
e.Miner().Register(agent)
return &PublicMinerAPI{e, agent}
}
// Mining returns an indication if this node is currently mining.
func (s *PublicMinerAPI) Mining() bool {
return s.e.IsMining()
}
// SubmitWork can be used by external miner to submit their POW solution. It returns an indication if the work was
// accepted. Note, this is not an indication if the provided work was valid!
func (s *PublicMinerAPI) SubmitWork(nonce rpc.HexNumber, solution, digest common.Hash) bool {
return s.agent.SubmitWork(nonce.Uint64(), digest, solution)
}
// GetWork returns a work package for external miner. The work package consists of 3 strings
// result[0], 32 bytes hex encoded current block header pow-hash
// result[1], 32 bytes hex encoded seed hash used for DAG
// result[2], 32 bytes hex encoded boundary condition ("target"), 2^256/difficulty
func (s *PublicMinerAPI) GetWork() (work [3]string, err error) {
if !s.e.IsMining() {
if err := s.e.StartMining(0, ""); err != nil {
return work, err
}
}
if work, err = s.agent.GetWork(); err == nil {
return
}
glog.V(logger.Debug).Infof("%v", err)
return work, fmt.Errorf("mining not ready")
}
// SubmitHashrate can be used for remote miners to submit their hash rate. This enables the node to report the combined
// hash rate of all miners which submit work through this node. It accepts the miner hash rate and an identifier which
// must be unique between nodes.
func (s *PublicMinerAPI) SubmitHashrate(hashrate rpc.HexNumber, id common.Hash) bool {
s.agent.SubmitHashrate(id, hashrate.Uint64())
return true
}
// PrivateMinerAPI provides private RPC methods to control the miner.
// These methods can be abused by external users and must be considered insecure for use by untrusted users.
type PrivateMinerAPI struct {
e *Ethereum
}
// NewPrivateMinerAPI create a new RPC service which controls the miner of this node.
func NewPrivateMinerAPI(e *Ethereum) *PrivateMinerAPI {
return &PrivateMinerAPI{e: e}
}
// Start the miner with the given number of threads. If threads is nil the number of
// workers started is equal to the number of logical CPU's that are usable by this process.
func (s *PrivateMinerAPI) Start(threads *rpc.HexNumber) (bool, error) {
s.e.StartAutoDAG()
if threads == nil {
threads = rpc.NewHexNumber(runtime.NumCPU())
}
err := s.e.StartMining(threads.Int(), "")
if err == nil {
return true, nil
}
return false, err
}
// Stop the miner
func (s *PrivateMinerAPI) Stop() bool {
s.e.StopMining()
return true
}
// SetExtra sets the extra data string that is included when this miner mines a block.
func (s *PrivateMinerAPI) SetExtra(extra string) (bool, error) {
if err := s.e.Miner().SetExtra([]byte(extra)); err != nil {
return false, err
}
return true, nil
}
// SetGasPrice sets the minimum accepted gas price for the miner.
func (s *PrivateMinerAPI) SetGasPrice(gasPrice rpc.HexNumber) bool {
s.e.Miner().SetGasPrice(gasPrice.BigInt())
return true
}
// SetEtherbase sets the etherbase of the miner
func (s *PrivateMinerAPI) SetEtherbase(etherbase common.Address) bool {
s.e.SetEtherbase(etherbase)
return true
}
// StartAutoDAG starts auto DAG generation. This will prevent the DAG generating on epoch change
// which will cause the node to stop mining during the generation process.
func (s *PrivateMinerAPI) StartAutoDAG() bool {
s.e.StartAutoDAG()
return true
}
// StopAutoDAG stops auto DAG generation
func (s *PrivateMinerAPI) StopAutoDAG() bool {
s.e.StopAutoDAG()
return true
}
// MakeDAG creates the new DAG for the given block number
func (s *PrivateMinerAPI) MakeDAG(blockNr rpc.BlockNumber) (bool, error) {
if err := ethash.MakeDAG(uint64(blockNr.Int64()), ""); err != nil {
return false, err
}
return true, nil
}
// PrivateAdminAPI is the collection of Etheruem full node-related APIs
// exposed over the private admin endpoint.
type PrivateAdminAPI struct {
eth *Ethereum
}
// NewPrivateAdminAPI creates a new API definition for the full node private
// admin methods of the Ethereum service.
func NewPrivateAdminAPI(eth *Ethereum) *PrivateAdminAPI {
return &PrivateAdminAPI{eth: eth}
}
// ExportChain exports the current blockchain into a local file.
func (api *PrivateAdminAPI) ExportChain(file string) (bool, error) {
// Make sure we can create the file to export into
out, err := os.OpenFile(file, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.ModePerm)
if err != nil {
return false, err
}
defer out.Close()
// Export the blockchain
if err := api.eth.BlockChain().Export(out); err != nil {
return false, err
}
return true, nil
}
func hasAllBlocks(chain *core.BlockChain, bs []*types.Block) bool {
for _, b := range bs {
if !chain.HasBlock(b.Hash()) {
return false
}
}
return true
}
// ImportChain imports a blockchain from a local file.
func (api *PrivateAdminAPI) ImportChain(file string) (bool, error) {
// Make sure the can access the file to import
in, err := os.Open(file)
if err != nil {
return false, err
}
defer in.Close()
// Run actual the import in pre-configured batches
stream := rlp.NewStream(in, 0)
blocks, index := make([]*types.Block, 0, 2500), 0
for batch := 0; ; batch++ {
// Load a batch of blocks from the input file
for len(blocks) < cap(blocks) {
block := new(types.Block)
if err := stream.Decode(block); err == io.EOF {
break
} else if err != nil {
return false, fmt.Errorf("block %d: failed to parse: %v", index, err)
}
blocks = append(blocks, block)
index++
}
if len(blocks) == 0 {
break
}
if hasAllBlocks(api.eth.BlockChain(), blocks) {
blocks = blocks[:0]
continue
}
// Import the batch and reset the buffer
if _, err := api.eth.BlockChain().InsertChain(blocks); err != nil {
return false, fmt.Errorf("batch %d: failed to insert: %v", batch, err)
}
blocks = blocks[:0]
}
return true, nil
}
// PublicDebugAPI is the collection of Etheruem full node APIs exposed
// over the public debugging endpoint.
type PublicDebugAPI struct {
eth *Ethereum
}
// NewPublicDebugAPI creates a new API definition for the full node-
// related public debug methods of the Ethereum service.
func NewPublicDebugAPI(eth *Ethereum) *PublicDebugAPI {
return &PublicDebugAPI{eth: eth}
}
// DumpBlock retrieves the entire state of the database at a given block.
func (api *PublicDebugAPI) DumpBlock(number uint64) (state.World, error) {
block := api.eth.BlockChain().GetBlockByNumber(number)
if block == nil {
return state.World{}, fmt.Errorf("block #%d not found", number)
}
stateDb, err := state.New(block.Root(), api.eth.ChainDb())
if err != nil {
return state.World{}, err
}
return stateDb.RawDump(), nil
}
// PrivateDebugAPI is the collection of Etheruem full node APIs exposed over
// the private debugging endpoint.
type PrivateDebugAPI struct {
config *core.ChainConfig
eth *Ethereum
}
// NewPrivateDebugAPI creates a new API definition for the full node-related
// private debug methods of the Ethereum service.
func NewPrivateDebugAPI(config *core.ChainConfig, eth *Ethereum) *PrivateDebugAPI {
return &PrivateDebugAPI{config: config, eth: eth}
}
// BlockTraceResult is the returned value when replaying a block to check for
// consensus results and full VM trace logs for all included transactions.
type BlockTraceResult struct {
Validated bool `json:"validated"`
StructLogs []ethapi.StructLogRes `json:"structLogs"`
Error string `json:"error"`
}
// TraceBlock processes the given block's RLP but does not import the block in to
// the chain.
func (api *PrivateDebugAPI) TraceBlock(blockRlp []byte, config *vm.Config) BlockTraceResult {
var block types.Block
err := rlp.Decode(bytes.NewReader(blockRlp), &block)
if err != nil {
return BlockTraceResult{Error: fmt.Sprintf("could not decode block: %v", err)}
}
validated, logs, err := api.traceBlock(&block, config)
return BlockTraceResult{
Validated: validated,
StructLogs: ethapi.FormatLogs(logs),
Error: formatError(err),
}
}
// TraceBlockFromFile loads the block's RLP from the given file name and attempts to
// process it but does not import the block in to the chain.
func (api *PrivateDebugAPI) TraceBlockFromFile(file string, config *vm.Config) BlockTraceResult {
blockRlp, err := ioutil.ReadFile(file)
if err != nil {
return BlockTraceResult{Error: fmt.Sprintf("could not read file: %v", err)}
}
return api.TraceBlock(blockRlp, config)
}
// TraceBlockByNumber processes the block by canonical block number.
func (api *PrivateDebugAPI) TraceBlockByNumber(number uint64, config *vm.Config) BlockTraceResult {
// Fetch the block that we aim to reprocess
block := api.eth.BlockChain().GetBlockByNumber(number)
if block == nil {
return BlockTraceResult{Error: fmt.Sprintf("block #%d not found", number)}
}
validated, logs, err := api.traceBlock(block, config)
return BlockTraceResult{
Validated: validated,
StructLogs: ethapi.FormatLogs(logs),
Error: formatError(err),
}
}
// TraceBlockByHash processes the block by hash.
func (api *PrivateDebugAPI) TraceBlockByHash(hash common.Hash, config *vm.Config) BlockTraceResult {
// Fetch the block that we aim to reprocess
block := api.eth.BlockChain().GetBlockByHash(hash)
if block == nil {
return BlockTraceResult{Error: fmt.Sprintf("block #%x not found", hash)}
}
validated, logs, err := api.traceBlock(block, config)
return BlockTraceResult{
Validated: validated,
StructLogs: ethapi.FormatLogs(logs),
Error: formatError(err),
}
}
// TraceCollector collects EVM structered logs.
//
// TraceCollector implements vm.Collector
type TraceCollector struct {
traces []vm.StructLog
}
// AddStructLog adds a structered log.
func (t *TraceCollector) AddStructLog(slog vm.StructLog) {
t.traces = append(t.traces, slog)
}
// traceBlock processes the given block but does not save the state.
func (api *PrivateDebugAPI) traceBlock(block *types.Block, config *vm.Config) (bool, []vm.StructLog, error) {
// Validate and reprocess the block
var (
blockchain = api.eth.BlockChain()
validator = blockchain.Validator()
processor = blockchain.Processor()
collector = &TraceCollector{}
)
if config == nil {
config = new(vm.Config)
}
config.Debug = true // make sure debug is set.
config.Logger.Collector = collector
if err := core.ValidateHeader(api.config, blockchain.AuxValidator(), block.Header(), blockchain.GetHeader(block.ParentHash(), block.NumberU64()-1), true, false); err != nil {
return false, collector.traces, err
}
statedb, err := state.New(blockchain.GetBlock(block.ParentHash(), block.NumberU64()-1).Root(), api.eth.ChainDb())
if err != nil {
return false, collector.traces, err
}
receipts, _, usedGas, err := processor.Process(block, statedb, *config)
if err != nil {
return false, collector.traces, err
}
if err := validator.ValidateState(block, blockchain.GetBlock(block.ParentHash(), block.NumberU64()-1), statedb, receipts, usedGas); err != nil {
return false, collector.traces, err
}
return true, collector.traces, nil
}
// callmsg is the message type used for call transations.
type callmsg struct {
addr common.Address
nonce uint64
to *common.Address
gas, gasPrice *big.Int
value *big.Int
data []byte
}
// accessor boilerplate to implement core.Message
func (m callmsg) From() (common.Address, error) { return m.addr, nil }
func (m callmsg) FromFrontier() (common.Address, error) { return m.addr, nil }
func (m callmsg) Nonce() uint64 { return m.nonce }
func (m callmsg) To() *common.Address { return m.to }
func (m callmsg) GasPrice() *big.Int { return m.gasPrice }
func (m callmsg) Gas() *big.Int { return m.gas }
func (m callmsg) Value() *big.Int { return m.value }
func (m callmsg) Data() []byte { return m.data }
// formatError formats a Go error into either an empty string or the data content
// of the error itself.
func formatError(err error) string {
if err == nil {
return ""
}
return err.Error()
}
// TraceTransaction returns the structured logs created during the execution of EVM
// and returns them as a JSON object.
func (api *PrivateDebugAPI) TraceTransaction(txHash common.Hash, logger *vm.LogConfig) (*ethapi.ExecutionResult, error) {
if logger == nil {
logger = new(vm.LogConfig)
}
// Retrieve the tx from the chain and the containing block
tx, blockHash, _, txIndex := core.GetTransaction(api.eth.ChainDb(), txHash)
if tx == nil {
return nil, fmt.Errorf("transaction %x not found", txHash)
}
block := api.eth.BlockChain().GetBlockByHash(blockHash)
if block == nil {
return nil, fmt.Errorf("block %x not found", blockHash)
}
// Create the state database to mutate and eventually trace
parent := api.eth.BlockChain().GetBlock(block.ParentHash(), block.NumberU64()-1)
if parent == nil {
return nil, fmt.Errorf("block parent %x not found", block.ParentHash())
}
stateDb, err := state.New(parent.Root(), api.eth.ChainDb())
if err != nil {
return nil, err
}
// Mutate the state and trace the selected transaction
for idx, tx := range block.Transactions() {
// Assemble the transaction call message
from, err := tx.FromFrontier()
if err != nil {
return nil, fmt.Errorf("sender retrieval failed: %v", err)
}
msg := callmsg{
addr: from,
to: tx.To(),
gas: tx.Gas(),
gasPrice: tx.GasPrice(),
value: tx.Value(),
data: tx.Data(),
}
// Mutate the state if we haven't reached the tracing transaction yet
if uint64(idx) < txIndex {
vmenv := core.NewEnv(stateDb, api.config, api.eth.BlockChain(), msg, block.Header(), vm.Config{})
_, _, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(tx.Gas()))
if err != nil {
return nil, fmt.Errorf("mutation failed: %v", err)
}
stateDb.DeleteSuicides()
continue
}
// Otherwise trace the transaction and return
vmenv := core.NewEnv(stateDb, api.config, api.eth.BlockChain(), msg, block.Header(), vm.Config{Debug: true, Logger: *logger})
ret, gas, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(tx.Gas()))
if err != nil {
return nil, fmt.Errorf("tracing failed: %v", err)
}
return &ethapi.ExecutionResult{
Gas: gas,
ReturnValue: fmt.Sprintf("%x", ret),
StructLogs: ethapi.FormatLogs(vmenv.StructLogs()),
}, nil
}
return nil, errors.New("database inconsistency")
}