forked from cerc-io/ipld-eth-server
80 lines
2.5 KiB
Go
80 lines
2.5 KiB
Go
// Copyright 2016 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 les
|
|
|
|
import (
|
|
"context"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/core/rawdb"
|
|
"github.com/ethereum/go-ethereum/eth/downloader"
|
|
"github.com/ethereum/go-ethereum/light"
|
|
)
|
|
|
|
// syncer is responsible for periodically synchronising with the network, both
|
|
// downloading hashes and blocks as well as handling the announcement handler.
|
|
func (pm *ProtocolManager) syncer() {
|
|
// Start and ensure cleanup of sync mechanisms
|
|
//pm.fetcher.Start()
|
|
//defer pm.fetcher.Stop()
|
|
defer pm.downloader.Terminate()
|
|
|
|
// Wait for different events to fire synchronisation operations
|
|
//forceSync := time.Tick(forceSyncCycle)
|
|
for {
|
|
select {
|
|
case <-pm.newPeerCh:
|
|
/* // Make sure we have peers to select from, then sync
|
|
if pm.peers.Len() < minDesiredPeerCount {
|
|
break
|
|
}
|
|
go pm.synchronise(pm.peers.BestPeer())
|
|
*/
|
|
/*case <-forceSync:
|
|
// Force a sync even if not enough peers are present
|
|
go pm.synchronise(pm.peers.BestPeer())
|
|
*/
|
|
case <-pm.noMorePeers:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (pm *ProtocolManager) needToSync(peerHead blockInfo) bool {
|
|
head := pm.blockchain.CurrentHeader()
|
|
currentTd := rawdb.ReadTd(pm.chainDb, head.Hash(), head.Number.Uint64())
|
|
return currentTd != nil && peerHead.Td.Cmp(currentTd) > 0
|
|
}
|
|
|
|
// synchronise tries to sync up our local block chain with a remote peer.
|
|
func (pm *ProtocolManager) synchronise(peer *peer) {
|
|
// Short circuit if no peers are available
|
|
if peer == nil {
|
|
return
|
|
}
|
|
|
|
// Make sure the peer's TD is higher than our own.
|
|
if !pm.needToSync(peer.headBlockInfo()) {
|
|
return
|
|
}
|
|
|
|
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
|
|
defer cancel()
|
|
pm.blockchain.(*light.LightChain).SyncCht(ctx)
|
|
pm.downloader.Synchronise(peer.id, peer.Head(), peer.Td(), downloader.LightSync)
|
|
}
|