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// 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 (
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
)
type ltrInfo struct {
tx *types.Transaction
sentTo map[*peer]struct{}
}
type LesTxRelay struct {
txSent map[common.Hash]*ltrInfo
txPending map[common.Hash]struct{}
ps *peerSet
peerList []*peer
peerStartPos int
lock sync.RWMutex
}
func NewLesTxRelay() *LesTxRelay {
return &LesTxRelay{
txSent: make(map[common.Hash]*ltrInfo),
txPending: make(map[common.Hash]struct{}),
ps: newPeerSet(),
}
}
func (self *LesTxRelay) addPeer(p *peer) {
self.lock.Lock()
defer self.lock.Unlock()
self.ps.Register(p)
self.peerList = self.ps.AllPeers()
}
func (self *LesTxRelay) removePeer(id string) {
self.lock.Lock()
defer self.lock.Unlock()
self.ps.Unregister(id)
self.peerList = self.ps.AllPeers()
}
// send sends a list of transactions to at most a given number of peers at
// once, never resending any particular transaction to the same peer twice
func (self *LesTxRelay) send(txs types.Transactions, count int) {
sendTo := make(map[*peer]types.Transactions)
self.peerStartPos++ // rotate the starting position of the peer list
if self.peerStartPos >= len(self.peerList) {
self.peerStartPos = 0
}
for _, tx := range txs {
hash := tx.Hash()
ltr, ok := self.txSent[hash]
if !ok {
ltr = <rInfo{
tx: tx,
sentTo: make(map[*peer]struct{}),
}
self.txSent[hash] = ltr
self.txPending[hash] = struct{}{}
}
if len(self.peerList) > 0 {
cnt := count
pos := self.peerStartPos
for {
peer := self.peerList[pos]
if _, ok := ltr.sentTo[peer]; !ok {
sendTo[peer] = append(sendTo[peer], tx)
ltr.sentTo[peer] = struct{}{}
cnt--
}
if cnt == 0 {
break // sent it to the desired number of peers
}
pos++
if pos == len(self.peerList) {
pos = 0
}
if pos == self.peerStartPos {
break // tried all available peers
}
}
}
}
for p, list := range sendTo {
cost := p.GetRequestCost(SendTxMsg, len(list))
go func(p *peer, list types.Transactions, cost uint64) {
p.fcServer.SendRequest(0, cost)
p.SendTxs(cost, list)
}(p, list, cost)
}
}
func (self *LesTxRelay) Send(txs types.Transactions) {
self.lock.Lock()
defer self.lock.Unlock()
self.send(txs, 3)
}
func (self *LesTxRelay) NewHead(head common.Hash, mined []common.Hash, rollback []common.Hash) {
self.lock.Lock()
defer self.lock.Unlock()
for _, hash := range mined {
delete(self.txPending, hash)
}
for _, hash := range rollback {
self.txPending[hash] = struct{}{}
}
if len(self.txPending) > 0 {
txs := make(types.Transactions, len(self.txPending))
i := 0
for hash := range self.txPending {
txs[i] = self.txSent[hash].tx
i++
}
self.send(txs, 1)
}
}
func (self *LesTxRelay) Discard(hashes []common.Hash) {
self.lock.Lock()
defer self.lock.Unlock()
for _, hash := range hashes {
delete(self.txSent, hash)
delete(self.txPending, hash)
}
}
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