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netsync: Track peer for requested blocks. #3444

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merged 2 commits into from
Sep 12, 2024
Merged

netsync: Track peer for requested blocks. #3444

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01dfc85
netsync: Track best known blocks per peer.
davecgh Sep 10, 2024
d2e603b
netsync: Track peer for requested blocks.
davecgh Sep 10, 2024
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40 changes: 26 additions & 14 deletions internal/netsync/manager.go
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Original file line number Diff line number Diff line change
Expand Up @@ -338,7 +338,7 @@ type SyncManager struct {
rejectedTxns *apbf.Filter
rejectedMixMsgs *apbf.Filter
requestedTxns map[chainhash.Hash]struct{}
requestedBlocks map[chainhash.Hash]struct{}
requestedBlocks map[chainhash.Hash]*Peer
requestedMixMsgs map[chainhash.Hash]struct{}
progressLogger *progresslog.Logger
syncPeer *Peer
Expand Down Expand Up @@ -424,6 +424,16 @@ func (m *SyncManager) maybeUpdateNextNeededBlocks() {
}
}

// isRequestedBlock returns whether or not the given block hash has already been
// requested from any remote peer.
//
// This function is NOT safe for concurrent access. It must be called from the
// event handler goroutine.
func (m *SyncManager) isRequestedBlock(hash *chainhash.Hash) bool {
_, ok := m.requestedBlocks[*hash]
return ok
}

// fetchNextBlocks creates and sends a request to the provided peer for the next
// blocks to be downloaded based on the current headers.
func (m *SyncManager) fetchNextBlocks(peer *Peer) {
Expand Down Expand Up @@ -458,12 +468,12 @@ func (m *SyncManager) fetchNextBlocks(peer *Peer) {
// Skip blocks that have already been requested. The needed blocks
// might have been updated above thereby potentially repopulating some
// blocks that are still in flight.
if _, ok := m.requestedBlocks[*hash]; ok {
if m.isRequestedBlock(hash) {
continue
}

iv := wire.NewInvVect(wire.InvTypeBlock, hash)
m.requestedBlocks[*hash] = struct{}{}
m.requestedBlocks[*hash] = peer
peer.requestedBlocks[*hash] = struct{}{}
gdmsg.AddInvVect(iv)
}
Expand Down Expand Up @@ -1454,14 +1464,19 @@ func (m *SyncManager) handleHeadersMsg(hmsg *headersMsg) {
// Skip the block when it has already been requested or is otherwise
// already known.
hash := &headerHashes[i]
_, isRequestedBlock := m.requestedBlocks[*hash]
if isRequestedBlock || chain.HaveBlock(hash) {
if m.isRequestedBlock(hash) || chain.HaveBlock(hash) {
continue
}

// Stop requesting when the request would exceed the max size of the
// map used to track requests.
if len(m.requestedBlocks)+1 > maxRequestedBlocks {
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Just highlighting that this is a change in behavior. Previously limitAdd would enforce limits onto m.requestedBlocks and peer.requestedBlocks separately, but with the new code peer.requestedBlocks is not being limited.

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@davecgh davecgh Sep 11, 2024 •
edited
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Indeed. I probably should've called this out in the description, but I changed it because the two maps really need to stay in sync. Otherwise, peers can be hit with misbehavior if expected entries are not in one map or the other.

It's currently not an issue because it's impossible to hit the limiting cases of limitAdd since there is a single sync peer and there are never more outstanding requests than maxInFlightBlocks = 16.

break
}

m.requestedBlocks[*hash] = peer
peer.requestedBlocks[*hash] = struct{}{}
iv := wire.NewInvVect(wire.InvTypeBlock, hash)
limitAdd(m.requestedBlocks, *hash, maxRequestedBlocks)
limitAdd(peer.requestedBlocks, *hash, maxRequestedBlocks)
gdmsg.AddInvVect(iv)
}
if len(gdmsg.InvList) > 0 {
Expand Down Expand Up @@ -1920,12 +1935,9 @@ func (m *SyncManager) requestFromPeer(peer *Peer, blocks, voteHashes,
// Add the blocks to the request.
msgResp := wire.NewMsgGetData()
for i := range blocks {
// If we've already requested this block, skip it.
// Skip the block when it has already been requested.
bh := &blocks[i]
_, alreadyReqP := peer.requestedBlocks[*bh]
_, alreadyReqB := m.requestedBlocks[*bh]

if alreadyReqP || alreadyReqB {
if m.isRequestedBlock(bh) {
continue
}

Expand All @@ -1942,7 +1954,7 @@ func (m *SyncManager) requestFromPeer(peer *Peer, blocks, voteHashes,
}

peer.requestedBlocks[*bh] = struct{}{}
m.requestedBlocks[*bh] = struct{}{}
m.requestedBlocks[*bh] = peer
}

addTxsToRequest := func(txs []chainhash.Hash, txType stake.TxType) error {
Expand Down Expand Up @@ -2169,7 +2181,7 @@ func New(config *Config) *SyncManager {
rejectedTxns: apbf.NewFilter(maxRejectedTxns, rejectedTxnsFPRate),
rejectedMixMsgs: apbf.NewFilter(maxRejectedMixMsgs, rejectedMixMsgsFPRate),
requestedTxns: make(map[chainhash.Hash]struct{}),
requestedBlocks: make(map[chainhash.Hash]struct{}),
requestedBlocks: make(map[chainhash.Hash]*Peer),
requestedMixMsgs: make(map[chainhash.Hash]struct{}),
peers: make(map[*Peer]struct{}),
minKnownWork: minKnownWork,
Expand Down