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22fd38c053
* [NOD-1038] Give higher priority for requesting missing ancestors when sending a getdata message (#767) * [NOD-1060] Don't sync from peers that break the netsync protocol
55 lines
2.0 KiB
Go
55 lines
2.0 KiB
Go
package p2p
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import (
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"github.com/kaspanet/kaspad/peer"
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"github.com/kaspanet/kaspad/wire"
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)
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// OnBlockLocator is invoked when a peer receives a locator kaspa
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// message.
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func (sp *Peer) OnBlockLocator(_ *peer.Peer, msg *wire.MsgBlockLocator) {
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sp.SetWasBlockLocatorRequested(false)
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// Find the highest known shared block between the peers, and asks
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// the block and its future from the peer. If the block is not
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// found, create a lower resolution block locator and send it to
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// the peer in order to find it in the next iteration.
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dag := sp.server.DAG
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if len(msg.BlockLocatorHashes) == 0 {
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sp.AddBanScoreAndPushRejectMsg(msg.Command(), wire.RejectInvalid, nil,
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peer.BanScoreEmptyBlockLocator, 0,
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"got empty block locator")
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// Whether the peer will be banned or not, syncing from a node that doesn't follow
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// the netsync protocol is undesired.
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sp.server.SyncManager.RemoveFromSyncCandidates(sp.Peer)
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return
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}
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// If the first hash of the block locator is known, it means we found
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// the highest shared block.
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highHash := msg.BlockLocatorHashes[0]
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if dag.IsInDAG(highHash) {
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if dag.IsKnownFinalizedBlock(highHash) {
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peerLog.Debugf("Cannot sync with peer %s because the highest"+
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" shared chain block (%s) is below the finality point", sp, highHash)
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sp.server.SyncManager.RemoveFromSyncCandidates(sp.Peer)
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return
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}
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// We send the highHash as the GetBlockInvsMsg's lowHash here.
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// This is not a mistake. The invs we desire start from the highest
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// hash that we know of and end at the highest hash that the peer
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// knows of.
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err := sp.Peer.PushGetBlockInvsMsg(highHash, sp.Peer.SelectedTipHash())
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if err != nil {
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peerLog.Errorf("Failed pushing get blocks message for peer %s: %s",
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sp, err)
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return
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}
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return
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}
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highHash, lowHash := dag.FindNextLocatorBoundaries(msg.BlockLocatorHashes)
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if highHash == nil {
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panic("Couldn't find any unknown hashes in the block locator.")
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}
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sp.PushGetBlockLocatorMsg(highHash, lowHash)
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}
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