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authorPéter Szilágyi <peterke@gmail.com>2017-05-30 03:05:30 +0800
committerPéter Szilágyi <peterke@gmail.com>2017-05-30 03:07:02 +0800
commit309da541dec34a51d38a8c4f7f76b7e0d3c8eb60 (patch)
treee439af10c00364060f4b4099a1643372086d2010
parentdd06c8584368316c8fb388384b0723d8c7e543f0 (diff)
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consensus/clique: cache block signatures for fast checks
-rw-r--r--consensus/clique/clique.go18
-rw-r--r--consensus/clique/snapshot.go39
2 files changed, 34 insertions, 23 deletions
diff --git a/consensus/clique/clique.go b/consensus/clique/clique.go
index 675333bcc..87a983377 100644
--- a/consensus/clique/clique.go
+++ b/consensus/clique/clique.go
@@ -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
}
diff --git a/consensus/clique/snapshot.go b/consensus/clique/snapshot.go
index 46b32ca5f..fb86bc5e6 100644
--- a/consensus/clique/snapshot.go
+++ b/consensus/clique/snapshot.go
@@ -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
@@ -44,7 +45,8 @@ 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
+ 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
@@ -57,14 +59,15 @@ 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,
- Number: number,
- Hash: hash,
- Signers: make(map[common.Address]struct{}),
- Recents: make(map[uint64]common.Address),
- Tally: make(map[common.Address]Tally),
+ config: config,
+ sigcache: sigcache,
+ Number: number,
+ Hash: hash,
+ Signers: make(map[common.Address]struct{}),
+ Recents: make(map[uint64]common.Address),
+ Tally: make(map[common.Address]Tally),
}
for _, signer := range signers {
snap.Signers[signer] = 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
}
@@ -99,13 +103,14 @@ func (s *Snapshot) store(db ethdb.Database) error {
// copy creates a deep copy of the snapshot, though not the individual votes.
func (s *Snapshot) copy() *Snapshot {
cpy := &Snapshot{
- config: s.config,
- Number: s.Number,
- Hash: s.Hash,
- Signers: make(map[common.Address]struct{}),
- Recents: make(map[uint64]common.Address),
- Votes: make([]*Vote, len(s.Votes)),
- Tally: make(map[common.Address]Tally),
+ config: s.config,
+ sigcache: s.sigcache,
+ Number: s.Number,
+ Hash: s.Hash,
+ Signers: make(map[common.Address]struct{}),
+ Recents: make(map[uint64]common.Address),
+ Votes: make([]*Vote, len(s.Votes)),
+ Tally: make(map[common.Address]Tally),
}
for signer := range s.Signers {
cpy.Signers[signer] = 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
}