path: root/eth/backend.go

// Copyright 2014 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 implements the Ethereum protocol.
package eth

import (
    "errors"
    "fmt"
    "math/big"
    "runtime"
    "sync"
    "sync/atomic"

    "github.com/ethereum/go-ethereum/accounts"
    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/common/hexutil"
    "github.com/ethereum/go-ethereum/consensus"
    "github.com/ethereum/go-ethereum/consensus/clique"
    "github.com/ethereum/go-ethereum/consensus/ethash"
    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/core/bloombits"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/core/vm"
    "github.com/ethereum/go-ethereum/eth/downloader"
    "github.com/ethereum/go-ethereum/eth/filters"
    "github.com/ethereum/go-ethereum/eth/gasprice"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/event"
    "github.com/ethereum/go-ethereum/internal/ethapi"
    "github.com/ethereum/go-ethereum/log"
    "github.com/ethereum/go-ethereum/miner"
    "github.com/ethereum/go-ethereum/node"
    "github.com/ethereum/go-ethereum/p2p"
    "github.com/ethereum/go-ethereum/params"
    "github.com/ethereum/go-ethereum/rlp"
    "github.com/ethereum/go-ethereum/rpc"
)

type LesServer interface {
    Start(srvr *p2p.Server)
    Stop()
    Protocols() []p2p.Protocol
}

// Ethereum implements the Ethereum full node service.
type Ethereum struct {
    config      *Config
    chainConfig *params.ChainConfig

    // Channel for shutting down the service
    shutdownChan  chan bool    // Channel for shutting down the ethereum
    stopDbUpgrade func() error // stop chain db sequential key upgrade

    // Handlers
    txPool          *core.TxPool
    blockchain      *core.BlockChain
    protocolManager *ProtocolManager
    lesServer       LesServer

    // DB interfaces
    chainDb ethdb.Database // Block chain database

    eventMux       *event.TypeMux
    engine         consensus.Engine
    accountManager *accounts.Manager

    bloomRequests chan chan *bloombits.Retrieval // Channel receiving bloom data retrieval requests
    bloomIndexer  *core.ChainIndexer             // Bloom indexer operating during block imports

    ApiBackend *EthApiBackend

    miner     *miner.Miner
    gasPrice  *big.Int
    etherbase common.Address

    networkId     uint64
    netRPCService *ethapi.PublicNetAPI

    lock sync.RWMutex // Protects the variadic fields (e.g. gas price and etherbase)
}

func (s *Ethereum) AddLesServer(ls LesServer) {
    s.lesServer = ls
}

// New creates a new Ethereum object (including the
// initialisation of the common Ethereum object)
func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
    if config.SyncMode == downloader.LightSync {
        return nil, errors.New("can't run eth.Ethereum in light sync mode, use les.LightEthereum")
    }
    if !config.SyncMode.IsValid() {
        return nil, fmt.Errorf("invalid sync mode %d", config.SyncMode)
    }
    chainDb, err := CreateDB(ctx, config, "chaindata")
    if err != nil {
        return nil, err
    }
    stopDbUpgrade := upgradeDeduplicateData(chainDb)
    chainConfig, genesisHash, genesisErr := core.SetupGenesisBlock(chainDb, config.Genesis)
    if _, ok := genesisErr.(*params.ConfigCompatError); genesisErr != nil && !ok {
        return nil, genesisErr
    }
    log.Info("Initialised chain configuration", "config", chainConfig)

    eth := &Ethereum{
        config:         config,
        chainDb:        chainDb,
        chainConfig:    chainConfig,
        eventMux:       ctx.EventMux,
        accountManager: ctx.AccountManager,
        engine:         CreateConsensusEngine(ctx, config, chainConfig, chainDb),
        shutdownChan:   make(chan bool),
        stopDbUpgrade:  stopDbUpgrade,
        networkId:      config.NetworkId,
        gasPrice:       config.GasPrice,
        etherbase:      config.Etherbase,
        bloomRequests:  make(chan chan *bloombits.Retrieval),
        bloomIndexer:   NewBloomIndexer(chainDb, params.BloomBitsBlocks),
    }

    log.Info("Initialising Ethereum protocol", "versions", ProtocolVersions, "network", config.NetworkId)

    if !config.SkipBcVersionCheck {
        bcVersion := core.GetBlockChainVersion(chainDb)
        if bcVersion != core.BlockChainVersion && bcVersion != 0 {
            return nil, fmt.Errorf("Blockchain DB version mismatch (%d / %d). Run geth upgradedb.\n", bcVersion, core.BlockChainVersion)
        }
        core.WriteBlockChainVersion(chainDb, core.BlockChainVersion)
    }

    vmConfig := vm.Config{EnablePreimageRecording: config.EnablePreimageRecording}
    eth.blockchain, err = core.NewBlockChain(chainDb, eth.chainConfig, eth.engine, vmConfig)
    if err != nil {
        return nil, err
    }
    // Rewind the chain in case of an incompatible config upgrade.
    if compat, ok := genesisErr.(*params.ConfigCompatError); ok {
        log.Warn("Rewinding chain to upgrade configuration", "err", compat)
        eth.blockchain.SetHead(compat.RewindTo)
        core.WriteChainConfig(chainDb, genesisHash, chainConfig)
    }
    eth.bloomIndexer.Start(eth.blockchain.CurrentHeader(), eth.blockchain.SubscribeChainEvent)

    if config.TxPool.Journal != "" {
        config.TxPool.Journal = ctx.ResolvePath(config.TxPool.Journal)
    }
    eth.txPool = core.NewTxPool(config.TxPool, eth.chainConfig, eth.blockchain)

    if eth.protocolManager, err = NewProtocolManager(eth.chainConfig, config.SyncMode, config.NetworkId, eth.eventMux, eth.txPool, eth.engine, eth.blockchain, chainDb); err != nil {
        return nil, err
    }
    eth.miner = miner.New(eth, eth.chainConfig, eth.EventMux(), eth.engine)
    eth.miner.SetExtra(makeExtraData(config.ExtraData))

    eth.ApiBackend = &EthApiBackend{eth, nil}
    gpoParams := config.GPO
    if gpoParams.Default == nil {
        gpoParams.Default = config.GasPrice
    }
    eth.ApiBackend.gpo = gasprice.NewOracle(eth.ApiBackend, gpoParams)

    return eth, nil
}

func makeExtraData(extra []byte) []byte {
    if len(extra) == 0 {
        // create default extradata
        extra, _ = rlp.EncodeToBytes([]interface{}{
            uint(params.VersionMajor<<16 | params.VersionMinor<<8 | params.VersionPatch),
            "geth",
            runtime.Version(),
            runtime.GOOS,
        })
    }
    if uint64(len(extra)) > params.MaximumExtraDataSize {
        log.Warn("Miner extra data exceed limit", "extra", hexutil.Bytes(extra), "limit", params.MaximumExtraDataSize)
        extra = nil
    }
    return extra
}

// CreateDB creates the chain database.
func CreateDB(ctx *node.ServiceContext, config *Config, name string) (ethdb.Database, error) {
    db, err := ctx.OpenDatabase(name, config.DatabaseCache, config.DatabaseHandles)
    if err != nil {
        return nil, err
    }
    if db, ok := db.(*ethdb.LDBDatabase); ok {
        db.Meter("eth/db/chaindata/")
    }
    return db, nil
}

// CreateConsensusEngine creates the required type of consensus engine instance for an Ethereum service
func CreateConsensusEngine(ctx *node.ServiceContext, config *Config, chainConfig *params.ChainConfig, db ethdb.Database) consensus.Engine {
    // If proof-of-authority is requested, set it up
    if chainConfig.Clique != nil {
        return clique.New(chainConfig.Clique, db)
    }
    // Otherwise assume proof-of-work
    switch {
    case config.PowFake:
        log.Warn("Ethash used in fake mode")
        return ethash.NewFaker()
    case config.PowTest:
        log.Warn("Ethash used in test mode")
        return ethash.NewTester()
    case config.PowShared:
        log.Warn("Ethash used in shared mode")
        return ethash.NewShared()
    default:
        engine := ethash.New(ctx.ResolvePath(config.EthashCacheDir), config.EthashCachesInMem, config.EthashCachesOnDisk,
            config.EthashDatasetDir, config.EthashDatasetsInMem, config.EthashDatasetsOnDisk)
        engine.SetThreads(-1) // Disable CPU mining
        return engine
    }
}

// APIs returns the collection of RPC services the ethereum package offers.
// NOTE, some of these services probably need to be moved to somewhere else.
func (s *Ethereum) APIs() []rpc.API {
    apis := ethapi.GetAPIs(s.ApiBackend)

    // Append any APIs exposed explicitly by the consensus engine
    apis = append(apis, s.engine.APIs(s.BlockChain())...)

    // Append all the local APIs and return
    return append(apis, []rpc.API{
        {
            Namespace: "eth",
            Version:   "1.0",
            Service:   NewPublicEthereumAPI(s),
            Public:    true,
        }, {
            Namespace: "eth",
            Version:   "1.0",
            Service:   NewPublicMinerAPI(s),
            Public:    true,
        }, {
            Namespace: "eth",
            Version:   "1.0",
            Service:   downloader.NewPublicDownloaderAPI(s.protocolManager.downloader, s.eventMux),
            Public:    true,
        }, {
            Namespace: "miner",
            Version:   "1.0",
            Service:   NewPrivateMinerAPI(s),
            Public:    false,
        }, {
            Namespace: "eth",
            Version:   "1.0",
            Service:   filters.NewPublicFilterAPI(s.ApiBackend, false),
            Public:    true,
        }, {
            Namespace: "admin",
            Version:   "1.0",
            Service:   NewPrivateAdminAPI(s),
        }, {
            Namespace: "debug",
            Version:   "1.0",
            Service:   NewPublicDebugAPI(s),
            Public:    true,
        }, {
            Namespace: "debug",
            Version:   "1.0",
            Service:   NewPrivateDebugAPI(s.chainConfig, s),
        }, {
            Namespace: "net",
            Version:   "1.0",
            Service:   s.netRPCService,
            Public:    true,
        },
    }...)
}

func (s *Ethereum) ResetWithGenesisBlock(gb *types.Block) {
    s.blockchain.ResetWithGenesisBlock(gb)
}

func (s *Ethereum) Etherbase() (eb common.Address, err error) {
    s.lock.RLock()
    etherbase := s.etherbase
    s.lock.RUnlock()

    if etherbase != (common.Address{}) {
        return etherbase, nil
    }
    if wallets := s.AccountManager().Wallets(); len(wallets) > 0 {
        if accounts := wallets[0].Accounts(); len(accounts) > 0 {
            return accounts[0].Address, nil
        }
    }
    return common.Address{}, fmt.Errorf("etherbase address must be explicitly specified")
}

// set in js console via admin interface or wrapper from cli flags
func (self *Ethereum) SetEtherbase(etherbase common.Address) {
    self.lock.Lock()
    self.etherbase = etherbase
    self.lock.Unlock()

    self.miner.SetEtherbase(etherbase)
}

func (s *Ethereum) StartMining(local bool) error {
    eb, err := s.Etherbase()
    if err != nil {
        log.Error("Cannot start mining without etherbase", "err", err)
        return fmt.Errorf("etherbase missing: %v", err)
    }
    if clique, ok := s.engine.(*clique.Clique); ok {
        wallet, err := s.accountManager.Find(accounts.Account{Address: eb})
        if wallet == nil || err != nil {
            log.Error("Etherbase account unavailable locally", "err", err)
            return fmt.Errorf("signer missing: %v", err)
        }
        clique.Authorize(eb, wallet.SignHash)
    }
    if local {
        // If local (CPU) mining is started, we can disable the transaction rejection
        // mechanism introduced to speed sync times. CPU mining on mainnet is ludicrous
        // so noone will ever hit this path, whereas marking sync done on CPU mining
        // will ensure that private networks work in single miner mode too.
        atomic.StoreUint32(&s.protocolManager.acceptTxs, 1)
    }
    go s.miner.Start(eb)
    return nil
}

func (s *Ethereum) StopMining()         { s.miner.Stop() }
func (s *Ethereum) IsMining() bool      { return s.miner.Mining() }
func (s *Ethereum) Miner() *miner.Miner { return s.miner }

func (s *Ethereum) AccountManager() *accounts.Manager  { return s.accountManager }
func (s *Ethereum) BlockChain() *core.BlockChain       { return s.blockchain }
func (s *Ethereum) TxPool() *core.TxPool               { return s.txPool }
func (s *Ethereum) EventMux() *event.TypeMux           { return s.eventMux }
func (s *Ethereum) Engine() consensus.Engine           { return s.engine }
func (s *Ethereum) ChainDb() ethdb.Database            { return s.chainDb }
func (s *Ethereum) IsListening() bool                  { return true } // Always listening
func (s *Ethereum) EthVersion() int                    { return int(s.protocolManager.SubProtocols[0].Version) }
func (s *Ethereum) NetVersion() uint64                 { return s.networkId }
func (s *Ethereum) Downloader() *downloader.Downloader { return s.protocolManager.downloader }

// Protocols implements node.Service, returning all the currently configured
// network protocols to start.
func (s *Ethereum) Protocols() []p2p.Protocol {
    if s.lesServer == nil {
        return s.protocolManager.SubProtocols
    }
    return append(s.protocolManager.SubProtocols, s.lesServer.Protocols()...)
}

// Start implements node.Service, starting all internal goroutines needed by the
// Ethereum protocol implementation.
func (s *Ethereum) Start(srvr *p2p.Server) error {
    // Start the bloom bits servicing goroutines
    s.startBloomHandlers()

    // Start the RPC service
    s.netRPCService = ethapi.NewPublicNetAPI(srvr, s.NetVersion())

    // Figure out a max peers count based on the server limits
    maxPeers := srvr.MaxPeers
    if s.config.LightServ > 0 {
        maxPeers -= s.config.LightPeers
        if maxPeers < srvr.MaxPeers/2 {
            maxPeers = srvr.MaxPeers / 2
        }
    }
    // Start the networking layer and the light server if requested
    s.protocolManager.Start(maxPeers)
    if s.lesServer != nil {
        s.lesServer.Start(srvr)
    }
    return nil
}

// Stop implements node.Service, terminating all internal goroutines used by the
// Ethereum protocol.
func (s *Ethereum) Stop() error {
    if s.stopDbUpgrade != nil {
        s.stopDbUpgrade()
    }
    s.bloomIndexer.Close()
    s.blockchain.Stop()
    s.protocolManager.Stop()
    if s.lesServer != nil {
        s.lesServer.Stop()
    }
    s.txPool.Stop()
    s.miner.Stop()
    s.eventMux.Stop()

    s.chainDb.Close()
    close(s.shutdownChan)

    return nil
}