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les/checkpointoracle: don't lookup checkpoint more than once per minute (#21285) 

* les/checkpointoracle: don't lookup checkpoint more than once per second

* les/checkpoint/oracle: change oracle checktime to 1 minute
This commit is contained in:
Martin Holst Swende 2020-07-02 10:15:11 +02:00 committed by GitHub
parent 04c4e50d72
commit 07a95ce571
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1 changed files with 16 additions and 0 deletions
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16
les/checkpointoracle/oracle.go
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@ -21,7 +21,9 @@ package checkpointoracle
import (
"encoding/binary"
"sync"
"sync/atomic"
"time"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
@ -40,6 +42,11 @@ type CheckpointOracle struct {
running int32 // Flag whether the contract backend is set or not
getLocal func(uint64) params.TrustedCheckpoint // Function used to retrieve local checkpoint
checkMu sync.Mutex // Mutex to sync access to the fields below
lastCheckTime time.Time // Time we last checked the checkpoint
lastCheckPoint *params.TrustedCheckpoint // The last stable checkpoint
lastCheckPointHeight uint64 // The height of last stable checkpoint
}
// New creates a checkpoint oracle handler with given configs and callback.
@ -88,6 +95,12 @@ func (oracle *CheckpointOracle) Contract() *checkpointoracle.CheckpointOracle {
// StableCheckpoint returns the stable checkpoint which was generated by local
// indexers and announced by trusted signers.
func (oracle *CheckpointOracle) StableCheckpoint() (*params.TrustedCheckpoint, uint64) {
oracle.checkMu.Lock()
defer oracle.checkMu.Unlock()
if time.Since(oracle.lastCheckTime) < 1*time.Minute {
return oracle.lastCheckPoint, oracle.lastCheckPointHeight
}
// Look it up properly
// Retrieve the latest checkpoint from the contract, abort if empty
latest, hash, height, err := oracle.contract.Contract().GetLatestCheckpoint(nil)
if err != nil || (latest == 0 && hash == [32]byte{}) {
@ -103,6 +116,9 @@ func (oracle *CheckpointOracle) StableCheckpoint() (*params.TrustedCheckpoint, u
//
// In both cases, no stable checkpoint will be returned.
if local.HashEqual(hash) {
oracle.lastCheckTime = time.Now()
oracle.lastCheckPointHeight = height.Uint64()
oracle.lastCheckPoint = &local
return &local, height.Uint64()
}
return nil, 0