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txrelay.go
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txrelay.go
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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 (
"context"
"errors"
"math/big"
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rlp"
)
var (
errGatewayFeeTooLow = errors.New("gateway fee too low to broadcast to peers")
)
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
lock sync.RWMutex
stop chan struct{}
retriever *retrieveManager
// TODO(nategraf) Replace this field with the ability to query peers for gateway fee.
gatewayFee *big.Int
}
func newLesTxRelay(ps *peerSet, retriever *retrieveManager, gatewayFee *big.Int) *lesTxRelay {
r := &lesTxRelay{
txSent: make(map[common.Hash]*ltrInfo),
txPending: make(map[common.Hash]struct{}),
ps: ps,
retriever: retriever,
stop: make(chan struct{}),
gatewayFee: gatewayFee,
}
ps.notify(r)
return r
}
func (self *lesTxRelay) Stop() {
close(self.stop)
}
func (self *lesTxRelay) registerPeer(p *peer) {
self.lock.Lock()
defer self.lock.Unlock()
self.peerList = self.ps.AllPeers()
}
func (self *lesTxRelay) unregisterPeer(p *peer) {
self.lock.Lock()
defer self.lock.Unlock()
self.peerList = self.ps.AllPeers()
}
func (self *lesTxRelay) HasPeerWithEtherbase(etherbase *common.Address) error {
_, err := self.ps.getPeerWithEtherbase(etherbase)
return err
}
func (self *lesTxRelay) CanRelayTransaction(tx *types.Transaction) error {
// TODO(nategraf) self.gatewayFee is used in place of the minimum gateway fee among peers.
// When it is possible to query peers for their gateway fee, this should be replaced.
// Check if there we have peer accepting transactions without a gateway fee.
if self.gatewayFee.Cmp(common.Big0) <= 0 {
return nil
}
// Should have a peer that will accept and broadcast our transaction.
if err := self.HasPeerWithEtherbase(tx.GatewayFeeRecipient()); err != nil {
return err
}
if tx.GatewayFee().Cmp(self.gatewayFee) < 0 {
return errGatewayFeeTooLow
}
return nil
}
// 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) {
sendTo := make(map[*peer]types.Transactions)
for _, tx := range txs {
hash := tx.Hash()
_, ok := self.txSent[hash]
if !ok {
p, err := self.ps.getPeerWithEtherbase(tx.GatewayFeeRecipient())
// TODO(asa): When this happens, the nonce is still incremented, preventing future txs from being added.
// We rely on transactions to be rejected in light/txpool validateTx to prevent transactions
// with GatewayFeeRecipient != one of our peers from making it to the relayer.
if err != nil {
log.Error("Unable to find peer with matching etherbase", "err", err, "tx.hash", tx.Hash(), "tx.gatewayFeeRecipient", tx.GatewayFeeRecipient())
continue
}
sendTo[p] = append(sendTo[p], tx)
ltr := <rInfo{
tx: tx,
sentTo: make(map[*peer]struct{}),
}
self.txSent[hash] = ltr
self.txPending[hash] = struct{}{}
}
}
for p, list := range sendTo {
pp := p
ll := list
enc, _ := rlp.EncodeToBytes(ll)
reqID := genReqID()
rq := &distReq{
getCost: func(dp distPeer) uint64 {
peer := dp.(*peer)
return peer.GetTxRelayCost(len(ll), len(enc))
},
canSend: func(dp distPeer) bool {
return !dp.(*peer).onlyAnnounce && dp.(*peer) == pp
},
request: func(dp distPeer) func() {
peer := dp.(*peer)
cost := peer.GetTxRelayCost(len(ll), len(enc))
peer.fcServer.QueuedRequest(reqID, cost)
return func() { peer.SendTxs(reqID, cost, enc) }
},
}
go self.retriever.retrieve(context.Background(), reqID, rq, func(p distPeer, msg *Msg) error { return nil }, self.stop)
}
}
func (self *lesTxRelay) Send(txs types.Transactions) {
self.lock.Lock()
defer self.lock.Unlock()
self.send(txs)
}
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)
}
}
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)
}
}