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eth: rework tx fetcher to use O(1) ops + manage network requests

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This commit is contained in:
Péter Szilágyi
2020-01-22 16:39:43 +02:00
parent 049e17116e
commit 9938d954c8
128 changed files with 2867 additions and 871 deletions
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75
eth/sync.go
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@ -38,13 +38,18 @@ const (
)
type txsync struct {
p *peer
hashes []common.Hash
txs []*types.Transaction
p *peer
txs []*types.Transaction
}
// syncTransactions starts sending all currently pending transactions to the given peer.
func (pm *ProtocolManager) syncTransactions(p *peer) {
// Assemble the set of transaction to broadcast or announce to the remote
// peer. Fun fact, this is quite an expensive operation as it needs to sort
// the transactions if the sorting is not cached yet. However, with a random
// order, insertions could overflow the non-executable queues and get dropped.
//
// TODO(karalabe): Figure out if we could get away with random order somehow
var txs types.Transactions
pending, _ := pm.txpool.Pending()
for _, batch := range pending {
@ -53,17 +58,29 @@ func (pm *ProtocolManager) syncTransactions(p *peer) {
if len(txs) == 0 {
return
}
// The eth/65 protocol introduces proper transaction announcements, so instead
// of dripping transactions across multiple peers, just send the entire list as
// an announcement and let the remote side decide what they need (likely nothing).
if p.version >= eth65 {
hashes := make([]common.Hash, len(txs))
for i, tx := range txs {
hashes[i] = tx.Hash()
}
p.AsyncSendPooledTransactionHashes(hashes)
return
}
// Out of luck, peer is running legacy protocols, drop the txs over
select {
case pm.txsyncCh <- &txsync{p: p, txs: txs}:
case <-pm.quitSync:
}
}
// txsyncLoop takes care of the initial transaction sync for each new
// txsyncLoop64 takes care of the initial transaction sync for each new
// connection. When a new peer appears, we relay all currently pending
// transactions. In order to minimise egress bandwidth usage, we send
// the transactions in small packs to one peer at a time.
func (pm *ProtocolManager) txsyncLoop() {
func (pm *ProtocolManager) txsyncLoop64() {
var (
pending = make(map[enode.ID]*txsync)
sending = false // whether a send is active
@ -72,44 +89,26 @@ func (pm *ProtocolManager) txsyncLoop() {
)
// send starts a sending a pack of transactions from the sync.
send := func(s *txsync) {
if s.p.version >= eth65 {
panic("initial transaction syncer running on eth/65+")
}
// Fill pack with transactions up to the target size.
size := common.StorageSize(0)
pack.p = s.p
pack.hashes = pack.hashes[:0]
pack.txs = pack.txs[:0]
if s.p.version >= eth65 {
// Eth65 introduces transaction announcement https://github.com/ethereum/EIPs/pull/2464,
// only txhashes are transferred here.
for i := 0; i < len(s.txs) && size < txsyncPackSize; i++ {
pack.hashes = append(pack.hashes, s.txs[i].Hash())
size += common.HashLength
}
// Remove the transactions that will be sent.
s.txs = s.txs[:copy(s.txs, s.txs[len(pack.hashes):])]
if len(s.txs) == 0 {
delete(pending, s.p.ID())
}
// Send the pack in the background.
s.p.Log().Trace("Sending batch of transaction announcements", "count", len(pack.hashes), "bytes", size)
sending = true
go func() { done <- pack.p.SendNewTransactionHashes(pack.hashes) }()
} else {
// Legacy eth protocol doesn't have transaction announcement protocol
// message, transfer the whole pending transaction slice.
for i := 0; i < len(s.txs) && size < txsyncPackSize; i++ {
pack.txs = append(pack.txs, s.txs[i])
size += s.txs[i].Size()
}
// Remove the transactions that will be sent.
s.txs = s.txs[:copy(s.txs, s.txs[len(pack.txs):])]
if len(s.txs) == 0 {
delete(pending, s.p.ID())
}
// Send the pack in the background.
s.p.Log().Trace("Sending batch of transactions", "count", len(pack.txs), "bytes", size)
sending = true
go func() { done <- pack.p.SendNewTransactions(pack.txs) }()
for i := 0; i < len(s.txs) && size < txsyncPackSize; i++ {
pack.txs = append(pack.txs, s.txs[i])
size += s.txs[i].Size()
}
// Remove the transactions that will be sent.
s.txs = s.txs[:copy(s.txs, s.txs[len(pack.txs):])]
if len(s.txs) == 0 {
delete(pending, s.p.ID())
}
// Send the pack in the background.
s.p.Log().Trace("Sending batch of transactions", "count", len(pack.txs), "bytes", size)
sending = true
go func() { done <- pack.p.SendTransactions64(pack.txs) }()
}
// pick chooses the next pending sync.