bsc/les/txrelay.go

180 lines
4.4 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"
"math/rand"
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/rlp"
)
type lesTxRelay struct {
txSent map[common.Hash]*types.Transaction
txPending map[common.Hash]struct{}
peerList []*serverPeer
peerStartPos int
lock sync.Mutex
stop chan struct{}
retriever *retrieveManager
}
func newLesTxRelay(ps *serverPeerSet, retriever *retrieveManager) *lesTxRelay {
r := &lesTxRelay{
txSent: make(map[common.Hash]*types.Transaction),
txPending: make(map[common.Hash]struct{}),
retriever: retriever,
stop: make(chan struct{}),
}
ps.subscribe(r)
return r
}
func (ltrx *lesTxRelay) Stop() {
close(ltrx.stop)
}
func (ltrx *lesTxRelay) registerPeer(p *serverPeer) {
ltrx.lock.Lock()
defer ltrx.lock.Unlock()
// Short circuit if the peer is announce only.
if p.onlyAnnounce {
return
}
ltrx.peerList = append(ltrx.peerList, p)
}
func (ltrx *lesTxRelay) unregisterPeer(p *serverPeer) {
ltrx.lock.Lock()
defer ltrx.lock.Unlock()
for i, peer := range ltrx.peerList {
if peer == p {
// Remove from the peer list
ltrx.peerList = append(ltrx.peerList[:i], ltrx.peerList[i+1:]...)
return
}
}
}
// send sends a list of transactions to at most a given number of peers.
func (ltrx *lesTxRelay) send(txs types.Transactions, count int) {
sendTo := make(map[*serverPeer]types.Transactions)
ltrx.peerStartPos++ // rotate the starting position of the peer list
if ltrx.peerStartPos >= len(ltrx.peerList) {
ltrx.peerStartPos = 0
}
for _, tx := range txs {
hash := tx.Hash()
_, ok := ltrx.txSent[hash]
if !ok {
ltrx.txSent[hash] = tx
ltrx.txPending[hash] = struct{}{}
}
if len(ltrx.peerList) > 0 {
cnt := count
pos := ltrx.peerStartPos
for {
peer := ltrx.peerList[pos]
sendTo[peer] = append(sendTo[peer], tx)
cnt--
if cnt == 0 {
break // sent it to the desired number of peers
}
pos++
if pos == len(ltrx.peerList) {
pos = 0
}
if pos == ltrx.peerStartPos {
break // tried all available peers
}
}
}
}
for p, list := range sendTo {
pp := p
ll := list
enc, _ := rlp.EncodeToBytes(ll)
reqID := rand.Uint64()
rq := &distReq{
getCost: func(dp distPeer) uint64 {
peer := dp.(*serverPeer)
return peer.getTxRelayCost(len(ll), len(enc))
},
canSend: func(dp distPeer) bool {
return !dp.(*serverPeer).onlyAnnounce && dp.(*serverPeer) == pp
},
request: func(dp distPeer) func() {
peer := dp.(*serverPeer)
cost := peer.getTxRelayCost(len(ll), len(enc))
peer.fcServer.QueuedRequest(reqID, cost)
return func() { peer.sendTxs(reqID, len(ll), enc) }
},
}
go ltrx.retriever.retrieve(context.Background(), reqID, rq, func(p distPeer, msg *Msg) error { return nil }, ltrx.stop)
}
}
func (ltrx *lesTxRelay) Send(txs types.Transactions) {
ltrx.lock.Lock()
defer ltrx.lock.Unlock()
ltrx.send(txs, 3)
}
func (ltrx *lesTxRelay) NewHead(head common.Hash, mined []common.Hash, rollback []common.Hash) {
ltrx.lock.Lock()
defer ltrx.lock.Unlock()
for _, hash := range mined {
delete(ltrx.txPending, hash)
}
for _, hash := range rollback {
ltrx.txPending[hash] = struct{}{}
}
if len(ltrx.txPending) > 0 {
txs := make(types.Transactions, len(ltrx.txPending))
i := 0
for hash := range ltrx.txPending {
txs[i] = ltrx.txSent[hash]
i++
}
ltrx.send(txs, 1)
}
}
func (ltrx *lesTxRelay) Discard(hashes []common.Hash) {
ltrx.lock.Lock()
defer ltrx.lock.Unlock()
for _, hash := range hashes {
delete(ltrx.txSent, hash)
delete(ltrx.txPending, hash)
}
}