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Merge pull request #14545 from karalabe/clique-cache-signatures

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consensus/clique: cache block signatures for fast checks
This commit is contained in:
Péter Szilágyi 2017-05-30 12:56:57 +03:00 committed by GitHub
commit b0f30b0b37
2 changed files with 34 additions and 23 deletions
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18
consensus/clique/clique.go
View File

@ -44,7 +44,7 @@ import (
const (
checkpointInterval = 1024 // Number of blocks after which to save the vote snapshot to the database
inmemorySnapshots = 128 // Number of recent vote snapshots to keep in memory
inmemorySignatures = 1024 // Number of recent blocks to keep in memory
inmemorySignatures = 4096 // Number of recent block signatures to keep in memory
wiggleTime = 500 * time.Millisecond // Random delay (per signer) to allow concurrent signers
)
@ -162,7 +162,12 @@ func sigHash(header *types.Header) (hash common.Hash) {
}
// ecrecover extracts the Ethereum account address from a signed header.
func ecrecover(header *types.Header) (common.Address, error) {
func ecrecover(header *types.Header, sigcache *lru.ARCCache) (common.Address, error) {
// If the signature's already cached, return that
hash := header.Hash()
if address, known := sigcache.Get(hash); known {
return address.(common.Address), nil
}
// Retrieve the signature from the header extra-data
if len(header.Extra) < extraSeal {
return common.Address{}, errMissingSignature
@ -177,6 +182,7 @@ func ecrecover(header *types.Header) (common.Address, error) {
var signer common.Address
copy(signer[:], crypto.Keccak256(pubkey[1:])[12:])
sigcache.Add(hash, signer)
return signer, nil
}
@ -223,7 +229,7 @@ func New(config *params.CliqueConfig, db ethdb.Database) *Clique {
// Author implements consensus.Engine, returning the Ethereum address recovered
// from the signature in the header's extra-data section.
func (c *Clique) Author(header *types.Header) (common.Address, error) {
return ecrecover(header)
return ecrecover(header, c.signatures)
}
// VerifyHeader checks whether a header conforms to the consensus rules.
@ -369,7 +375,7 @@ func (c *Clique) snapshot(chain consensus.ChainReader, number uint64, hash commo
}
// If an on-disk checkpoint snapshot can be found, use that
if number%checkpointInterval == 0 {
if s, err := loadSnapshot(c.config, c.db, hash); err == nil {
if s, err := loadSnapshot(c.config, c.signatures, c.db, hash); err == nil {
log.Trace("Loaded voting snapshot form disk", "number", number, "hash", hash)
snap = s
break
@ -385,7 +391,7 @@ func (c *Clique) snapshot(chain consensus.ChainReader, number uint64, hash commo
for i := 0; i < len(signers); i++ {
copy(signers[i][:], genesis.Extra[extraVanity+i*common.AddressLength:])
}
snap = newSnapshot(c.config, 0, genesis.Hash(), signers)
snap = newSnapshot(c.config, c.signatures, 0, genesis.Hash(), signers)
if err := snap.store(c.db); err != nil {
return nil, err
}
@ -464,7 +470,7 @@ func (c *Clique) verifySeal(chain consensus.ChainReader, header *types.Header, p
c.recents.Add(snap.Hash, snap)
// Resolve the authorization key and check against signers
signer, err := ecrecover(header)
signer, err := ecrecover(header, c.signatures)
if err != nil {
return err
}

11
consensus/clique/snapshot.go
View File

@ -24,6 +24,7 @@ import (
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/params"
lru "github.com/hashicorp/golang-lru"
)
// Vote represents a single vote that an authorized signer made to modify the
@ -45,6 +46,7 @@ type Tally struct {
// Snapshot is the state of the authorization voting at a given point in time.
type Snapshot struct {
config *params.CliqueConfig // Consensus engine parameters to fine tune behavior
sigcache *lru.ARCCache // Cache of recent block signatures to speed up ecrecover
Number uint64 `json:"number"` // Block number where the snapshot was created
Hash common.Hash `json:"hash"` // Block hash where the snapshot was created
@ -57,9 +59,10 @@ type Snapshot struct {
// newSnapshot create a new snapshot with the specified startup parameters. This
// method does not initialize the set of recent signers, so only ever use if for
// the genesis block.
func newSnapshot(config *params.CliqueConfig, number uint64, hash common.Hash, signers []common.Address) *Snapshot {
func newSnapshot(config *params.CliqueConfig, sigcache *lru.ARCCache, number uint64, hash common.Hash, signers []common.Address) *Snapshot {
snap := &Snapshot{
config: config,
sigcache: sigcache,
Number: number,
Hash: hash,
Signers: make(map[common.Address]struct{}),
@ -73,7 +76,7 @@ func newSnapshot(config *params.CliqueConfig, number uint64, hash common.Hash, s
}
// loadSnapshot loads an existing snapshot from the database.
func loadSnapshot(config *params.CliqueConfig, db ethdb.Database, hash common.Hash) (*Snapshot, error) {
func loadSnapshot(config *params.CliqueConfig, sigcache *lru.ARCCache, db ethdb.Database, hash common.Hash) (*Snapshot, error) {
blob, err := db.Get(append([]byte("clique-"), hash[:]...))
if err != nil {
return nil, err
@ -83,6 +86,7 @@ func loadSnapshot(config *params.CliqueConfig, db ethdb.Database, hash common.Ha
return nil, err
}
snap.config = config
snap.sigcache = sigcache
return snap, nil
}
@ -100,6 +104,7 @@ func (s *Snapshot) store(db ethdb.Database) error {
func (s *Snapshot) copy() *Snapshot {
cpy := &Snapshot{
config: s.config,
sigcache: s.sigcache,
Number: s.Number,
Hash: s.Hash,
Signers: make(map[common.Address]struct{}),
@ -190,7 +195,7 @@ func (s *Snapshot) apply(headers []*types.Header) (*Snapshot, error) {
delete(snap.Recents, number-limit)
}
// Resolve the authorization key and check against signers
signer, err := ecrecover(header)
signer, err := ecrecover(header, s.sigcache)
if err != nil {
return nil, err
}