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core, consensus: pluggable consensus engines (#3817)

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This commit adds pluggable consensus engines to go-ethereum. In short, it
introduces a generic consensus interface, and refactors the entire codebase to
use this interface.
This commit is contained in:
Péter Szilágyi
2017-04-05 01:16:29 +03:00
committed by Felix Lange
parent e50a5b7771
commit 09777952ee
61 changed files with 1681 additions and 1426 deletions
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32
light/lightchain.go
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@ -24,13 +24,13 @@ import (
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/consensus"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/pow"
"github.com/ethereum/go-ethereum/rlp"
"github.com/hashicorp/golang-lru"
)
@ -64,14 +64,13 @@ type LightChain struct {
procInterrupt int32 // interrupt signaler for block processing
wg sync.WaitGroup
pow pow.PoW
validator core.HeaderValidator
engine consensus.Engine
}
// NewLightChain returns a fully initialised light chain using information
// available in the database. It initialises the default Ethereum header
// validator.
func NewLightChain(odr OdrBackend, config *params.ChainConfig, pow pow.PoW, mux *event.TypeMux) (*LightChain, error) {
func NewLightChain(odr OdrBackend, config *params.ChainConfig, engine consensus.Engine, mux *event.TypeMux) (*LightChain, error) {
bodyCache, _ := lru.New(bodyCacheLimit)
bodyRLPCache, _ := lru.New(bodyCacheLimit)
blockCache, _ := lru.New(blockCacheLimit)
@ -84,21 +83,17 @@ func NewLightChain(odr OdrBackend, config *params.ChainConfig, pow pow.PoW, mux
bodyCache: bodyCache,
bodyRLPCache: bodyRLPCache,
blockCache: blockCache,
pow: pow,
engine: engine,
}
var err error
bc.hc, err = core.NewHeaderChain(odr.Database(), config, bc.Validator, bc.getProcInterrupt)
bc.SetValidator(core.NewHeaderValidator(config, bc.hc, pow))
bc.hc, err = core.NewHeaderChain(odr.Database(), config, bc.engine, bc.getProcInterrupt)
if err != nil {
return nil, err
}
bc.genesisBlock, _ = bc.GetBlockByNumber(NoOdr, 0)
if bc.genesisBlock == nil {
return nil, core.ErrNoGenesis
}
if bc.genesisBlock.Hash() == params.MainNetGenesisHash {
// add trusted CHT
WriteTrustedCht(bc.chainDb, TrustedCht{Number: 805, Root: common.HexToHash("85e4286fe0a730390245c49de8476977afdae0eb5530b277f62a52b12313d50f")})
@ -145,9 +140,6 @@ func (self *LightChain) loadLastState() error {
headerTd := self.GetTd(header.Hash(), header.Number.Uint64())
log.Info("Loaded most recent local header", "number", header.Number, "hash", header.Hash(), "td", headerTd)
// Try to be smart and issue a pow verification for the head to pre-generate caches
go self.pow.Verify(types.NewBlockWithHeader(header))
return nil
}
@ -188,20 +180,6 @@ func (self *LightChain) Status() (td *big.Int, currentBlock common.Hash, genesis
return self.GetTd(hash, header.Number.Uint64()), hash, self.genesisBlock.Hash()
}
// SetValidator sets the validator which is used to validate incoming headers.
func (self *LightChain) SetValidator(validator core.HeaderValidator) {
self.procmu.Lock()
defer self.procmu.Unlock()
self.validator = validator
}
// Validator returns the current header validator.
func (self *LightChain) Validator() core.HeaderValidator {
self.procmu.RLock()
defer self.procmu.RUnlock()
return self.validator
}
// State returns a new mutable state based on the current HEAD block.
func (self *LightChain) State() *LightState {
return NewLightState(StateTrieID(self.hc.CurrentHeader()), self.odr)