101 lines
2.9 KiB
Go
101 lines
2.9 KiB
Go
package eth
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import (
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"math"
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"time"
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"github.com/ethereum/go-ethereum/eth/downloader"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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)
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// Sync contains all synchronisation code for the eth protocol
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func (pm *ProtocolManager) update() {
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// itimer is used to determine when to start ignoring `minDesiredPeerCount`
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itimer := time.NewTimer(peerCountTimeout)
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// btimer is used for picking of blocks from the downloader
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btimer := time.Tick(blockProcTimer)
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for {
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select {
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case <-pm.newPeerCh:
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// Meet the `minDesiredPeerCount` before we select our best peer
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if len(pm.peers) < minDesiredPeerCount {
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break
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}
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// Find the best peer
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peer := getBestPeer(pm.peers)
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if peer == nil {
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glog.V(logger.Debug).Infoln("Sync attempt cancelled. No peers available")
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}
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itimer.Stop()
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go pm.synchronize(peer)
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case <-itimer.C:
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// The timer will make sure that the downloader keeps an active state
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// in which it attempts to always check the network for highest td peers
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// Either select the peer or restart the timer if no peers could
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// be selected.
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if peer := getBestPeer(pm.peers); peer != nil {
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go pm.synchronize(peer)
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} else {
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itimer.Reset(5 * time.Second)
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}
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case <-btimer:
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go pm.processBlocks()
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case <-pm.quitSync:
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return
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}
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}
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}
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// processBlocks will attempt to reconstruct a chain by checking the first item and check if it's
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// a known parent. The first block in the chain may be unknown during downloading. When the
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// downloader isn't downloading blocks will be dropped with an unknown parent until either it
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// has depleted the list or found a known parent.
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func (pm *ProtocolManager) processBlocks() error {
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pm.wg.Add(1)
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defer pm.wg.Done()
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blocks := pm.downloader.TakeBlocks()
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if len(blocks) == 0 {
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return nil
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}
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glog.V(logger.Debug).Infof("Inserting chain with %d blocks (#%v - #%v)\n", len(blocks), blocks[0].Number(), blocks[len(blocks)-1].Number())
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for len(blocks) != 0 && !pm.quit {
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max := int(math.Min(float64(len(blocks)), float64(blockProcAmount)))
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_, err := pm.chainman.InsertChain(blocks[:max])
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if err != nil {
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return err
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}
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blocks = blocks[max:]
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}
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return nil
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}
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func (pm *ProtocolManager) synchronize(peer *peer) {
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// Make sure the peer's TD is higher than our own. If not drop.
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if peer.td.Cmp(pm.chainman.Td()) <= 0 {
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return
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}
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// FIXME if we have the hash in our chain and the TD of the peer is
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// much higher than ours, something is wrong with us or the peer.
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// Check if the hash is on our own chain
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if pm.chainman.HasBlock(peer.recentHash) {
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return
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}
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// Get the hashes from the peer (synchronously)
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err := pm.downloader.Synchronize(peer.id, peer.recentHash)
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if err != nil && err == downloader.ErrBadPeer {
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glog.V(logger.Debug).Infoln("removed peer from peer set due to bad action")
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pm.removePeer(peer)
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} else if err != nil {
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// handle error
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glog.V(logger.Detail).Infoln("error downloading:", err)
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}
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}
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