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msg_service.go
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msg_service.go
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// Copyright (C) 2021 Aung Maw
// Copyright (C) 2023 Wooyang2018
// Licensed under the GNU General Public License v3.0
package p2p
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"sync/atomic"
"time"
pubsub "github.com/libp2p/go-libp2p-pubsub"
"google.golang.org/protobuf/proto"
"github.com/wooyang2018/ppov-blockchain/core"
"github.com/wooyang2018/ppov-blockchain/emitter"
"github.com/wooyang2018/ppov-blockchain/logger"
"github.com/wooyang2018/ppov-blockchain/pb"
)
type MsgType byte
const (
_ MsgType = iota
MsgTypeBatch
MsgTypeBatchVote
MsgTypeProposal
MsgTypeVote
MsgTypeNewView
MsgTypeTxList
MsgTypeRequest
MsgTypeResponse
)
type msgReceiver func(peer *Peer, data []byte)
type topicReceiver func(data []byte)
type MsgService struct {
host *Host
pointReceivers map[MsgType]msgReceiver
topicReceivers map[MsgType]topicReceiver
batchEmitter *emitter.Emitter
batchVoteEmitter *emitter.Emitter
proposalEmitter *emitter.Emitter
voteEmitter *emitter.Emitter
newViewEmitter *emitter.Emitter
txListEmitter *emitter.Emitter
reqHandlers map[pb.Request_Type]ReqHandler
reqClientSeq uint32
}
func NewMsgService(host *Host) *MsgService {
svc := new(MsgService)
svc.host = host
for _, peer := range svc.host.PeerStore().List() {
go svc.listenPeer(peer)
}
go svc.listenTopic(host)
svc.reqHandlers = make(map[pb.Request_Type]ReqHandler)
svc.setEmitters()
svc.setMsgReceivers()
svc.setTopicReceivers()
return svc
}
func (svc *MsgService) SubscribeBatch(buffer int) *emitter.Subscription {
return svc.batchEmitter.Subscribe(buffer)
}
func (svc *MsgService) SubscribeProposal(buffer int) *emitter.Subscription {
return svc.proposalEmitter.Subscribe(buffer)
}
func (svc *MsgService) SubscribeVote(buffer int) *emitter.Subscription {
return svc.voteEmitter.Subscribe(buffer)
}
func (svc *MsgService) SubscribeBatchVote(buffer int) *emitter.Subscription {
return svc.batchVoteEmitter.Subscribe(buffer)
}
func (svc *MsgService) SubscribeNewView(buffer int) *emitter.Subscription {
return svc.newViewEmitter.Subscribe(buffer)
}
func (svc *MsgService) SubscribeTxList(buffer int) *emitter.Subscription {
return svc.txListEmitter.Subscribe(buffer)
}
func (svc *MsgService) BroadcastProposal(blk *core.Block) error {
data, err := blk.Marshal()
if err != nil {
return err
}
return svc.broadcastData(MsgTypeProposal, data)
}
func (svc *MsgService) BroadcastBatch(batch *core.Batch) error {
data, err := batch.Marshal()
if err != nil {
return err
}
return svc.broadcastData(MsgTypeBatch, data)
}
func (svc *MsgService) BroadcastNewView(qc *core.QuorumCert) error {
data, err := qc.Marshal()
if err != nil {
return err
}
return svc.broadcastData(MsgTypeNewView, data)
}
func (svc *MsgService) SendBatch(pubKey *core.PublicKey, batch *core.Batch) error {
data, err := batch.Marshal()
if err != nil {
return err
}
return svc.sendData(pubKey, MsgTypeBatch, data)
}
func (svc *MsgService) SendVote(pubKey *core.PublicKey, vote *core.Vote) error {
data, err := vote.Marshal()
if err != nil {
return err
}
return svc.sendData(pubKey, MsgTypeVote, data)
}
func (svc *MsgService) SendBatchVote(pubKey *core.PublicKey, vote *core.BatchVote) error {
data, err := vote.Marshal()
if err != nil {
return err
}
return svc.sendData(pubKey, MsgTypeBatchVote, data)
}
func (svc *MsgService) SendNewView(pubKey *core.PublicKey, qc *core.QuorumCert) error {
data, err := qc.Marshal()
if err != nil {
return err
}
return svc.sendData(pubKey, MsgTypeNewView, data)
}
func (svc *MsgService) BroadcastTxList(txList *core.TxList) error {
data, err := txList.Marshal()
if err != nil {
return err
}
return svc.broadcastData(MsgTypeTxList, data)
}
func (svc *MsgService) RequestBlock(pubKey *core.PublicKey, hash []byte) (*core.Block, error) {
respData, err := svc.requestData(pubKey, pb.Request_Block, hash)
if err != nil {
return nil, err
}
blk := core.NewBlock()
if err := blk.Unmarshal(respData); err != nil {
return nil, err
}
return blk, nil
}
func (svc *MsgService) RequestBlockByHeight(
pubKey *core.PublicKey, height uint64,
) (*core.Block, error) {
buf := bytes.NewBuffer(nil)
binary.Write(buf, binary.BigEndian, height)
respData, err := svc.requestData(pubKey, pb.Request_BlockByHeight, buf.Bytes())
if err != nil {
return nil, err
}
blk := core.NewBlock()
if err := blk.Unmarshal(respData); err != nil {
return nil, err
}
return blk, nil
}
func (svc *MsgService) RequestTxList(pubKey *core.PublicKey, hashes [][]byte) (*core.TxList, error) {
hl := new(pb.HashList)
hl.List = hashes
reqData, _ := proto.Marshal(hl)
respData, err := svc.requestData(pubKey, pb.Request_TxList, reqData)
if err != nil {
return nil, err
}
txList := core.NewTxList()
if err := txList.Unmarshal(respData); err != nil {
return nil, err
}
return txList, nil
}
func (svc *MsgService) SetReqHandler(reqHandler ReqHandler) error {
if _, found := svc.reqHandlers[reqHandler.Type()]; found {
return fmt.Errorf("request handler already set %s", reqHandler.Type())
}
svc.reqHandlers[reqHandler.Type()] = reqHandler
return nil
}
func (svc *MsgService) setEmitters() {
svc.batchEmitter = emitter.New()
svc.batchVoteEmitter = emitter.New()
svc.proposalEmitter = emitter.New()
svc.voteEmitter = emitter.New()
svc.newViewEmitter = emitter.New()
svc.txListEmitter = emitter.New()
}
func (svc *MsgService) setMsgReceivers() {
svc.pointReceivers = make(map[MsgType]msgReceiver)
svc.pointReceivers[MsgTypeBatch] = svc.onReceiveBatch
svc.pointReceivers[MsgTypeBatchVote] = svc.onReceiveBatchVote
svc.pointReceivers[MsgTypeProposal] = svc.onReceiveProposal
svc.pointReceivers[MsgTypeVote] = svc.onReceiveVote
svc.pointReceivers[MsgTypeNewView] = svc.onReceiveNewView
svc.pointReceivers[MsgTypeTxList] = svc.onReceiveTxList
svc.pointReceivers[MsgTypeRequest] = svc.onReceiveRequest
}
func (svc *MsgService) setTopicReceivers() {
svc.topicReceivers = make(map[MsgType]topicReceiver)
svc.topicReceivers[MsgTypeBatch] = svc.onReceiveBatch2
svc.topicReceivers[MsgTypeProposal] = svc.onReceiveProposal2
svc.topicReceivers[MsgTypeTxList] = svc.onReceiveTxList2
svc.topicReceivers[MsgTypeNewView] = svc.onReceiveNewView2
}
func (svc *MsgService) listenPeer(peer *Peer) {
sub := peer.SubscribeMsg()
for e := range sub.Events() {
msg := e.([]byte)
if len(msg) < 2 {
continue // invalid message
}
if receiver, found := svc.pointReceivers[MsgType(msg[0])]; found {
receiver(peer, msg[1:])
} else {
logger.I().Errorw("received invalid message", "type", msg[0])
}
}
}
func (svc *MsgService) listenTopic(host *Host) {
sub := host.SubscribeMsg()
for e := range sub.Events() {
msg := e.(*pubsub.Message)
if receiver, found := svc.topicReceivers[MsgType(msg.Data[0])]; found {
receiver(msg.Data[1:])
} else {
logger.I().Error("received invalid topic message")
}
}
}
func (svc *MsgService) onReceiveBatch(peer *Peer, data []byte) {
batch := core.NewBatch()
if err := batch.Unmarshal(data); err != nil {
logger.I().Errorw("receive batch failed", "error", err)
return
}
svc.batchEmitter.Emit(batch)
}
func (svc *MsgService) onReceiveBatch2(data []byte) {
batch := core.NewBatch()
if err := batch.Unmarshal(data); err != nil {
logger.I().Errorw("receive topic batch failed", "error", err)
return
}
svc.batchEmitter.Emit(batch)
}
func (svc *MsgService) onReceiveBatchVote(peer *Peer, data []byte) {
vote := core.NewBatchVote()
if err := vote.Unmarshal(data); err != nil {
logger.I().Errorw("receive batch vote failed", "error", err)
return
}
svc.batchVoteEmitter.Emit(vote)
}
func (svc *MsgService) onReceiveProposal(peer *Peer, data []byte) {
blk := core.NewBlock()
if err := blk.Unmarshal(data); err != nil {
logger.I().Errorw("receive proposal failed", "error", err)
return
}
svc.proposalEmitter.Emit(blk)
}
func (svc *MsgService) onReceiveProposal2(data []byte) {
blk := core.NewBlock()
if err := blk.Unmarshal(data); err != nil {
logger.I().Errorw("receive topic proposal failed", "error", err)
return
}
svc.proposalEmitter.Emit(blk)
}
func (svc *MsgService) onReceiveVote(peer *Peer, data []byte) {
vote := core.NewVote()
if err := vote.Unmarshal(data); err != nil {
logger.I().Errorw("receive vote failed", "error", err)
return
}
svc.voteEmitter.Emit(vote)
}
func (svc *MsgService) onReceiveNewView(peer *Peer, data []byte) {
qc := core.NewQuorumCert()
if err := qc.Unmarshal(data); err != nil {
logger.I().Errorw("receive new view failed", "error", err)
return
}
svc.newViewEmitter.Emit(qc)
}
func (svc *MsgService) onReceiveNewView2(data []byte) {
qc := core.NewQuorumCert()
if err := qc.Unmarshal(data); err != nil {
logger.I().Errorw("receive topic new view failed", "error", err)
return
}
svc.newViewEmitter.Emit(qc)
}
func (svc *MsgService) onReceiveTxList(peer *Peer, data []byte) {
txList := core.NewTxList()
if err := txList.Unmarshal(data); err != nil {
logger.I().Errorw("receive tx list failed", "error", err)
return
}
svc.txListEmitter.Emit(txList)
}
func (svc *MsgService) onReceiveTxList2(data []byte) {
txList := core.NewTxList()
if err := txList.Unmarshal(data); err != nil {
logger.I().Errorw("receive topic tx list failed", "error", err)
return
}
svc.txListEmitter.Emit(txList)
}
func (svc *MsgService) onReceiveRequest(peer *Peer, data []byte) {
req := new(pb.Request)
if err := proto.Unmarshal(data, req); err != nil {
return
}
resp := new(pb.Response)
resp.Seq = req.Seq
if hdlr, found := svc.reqHandlers[req.Type]; found {
data, err := hdlr.HandleReq(req.Data)
if err != nil {
resp.Error = err.Error()
} else {
resp.Data = data
}
} else {
resp.Error = "no handler for request"
}
b, _ := proto.Marshal(resp)
peer.WriteMsg(append([]byte{byte(MsgTypeResponse)}, b...))
}
func (svc *MsgService) broadcastData(msgType MsgType, data []byte) error {
return svc.host.chatRoom.Publish(append([]byte{byte(msgType)}, data...))
}
func (svc *MsgService) sendData(pubKey *core.PublicKey, msgType MsgType, data []byte) error {
peer := svc.host.PeerStore().Load(pubKey)
if peer == nil {
return errors.New("peer not found")
}
return peer.WriteMsg(append([]byte{byte(msgType)}, data...))
}
func (svc *MsgService) requestData(pubKey *core.PublicKey,
reqType pb.Request_Type, reqData []byte) ([]byte, error) {
peer := svc.host.PeerStore().Load(pubKey)
if peer == nil {
return nil, errors.New("peer not found")
}
req := new(pb.Request)
req.Type = reqType
req.Data = reqData
req.Seq = atomic.AddUint32(&svc.reqClientSeq, 1)
b, _ := proto.Marshal(req)
sub := peer.SubscribeMsg()
defer sub.Unsubscribe()
err := peer.WriteMsg(append([]byte{byte(MsgTypeRequest)}, b...))
if err != nil {
return nil, err
}
return svc.waitResponse(sub, req.Seq)
}
func (svc *MsgService) waitResponse(sub *emitter.Subscription, seq uint32) ([]byte, error) {
timeout := time.After(5 * time.Second)
for {
select {
case <-timeout:
return nil, errors.New("request timeout")
case e := <-sub.Events():
msg := e.([]byte)
if len(msg) < 2 {
continue
}
if MsgType(msg[0]) == MsgTypeResponse {
resp := new(pb.Response)
if err := proto.Unmarshal(msg[1:], resp); err != nil {
continue
}
if resp.Seq == seq {
if len(resp.Error) > 0 {
return nil, errors.New(resp.Error)
}
return resp.Data, nil
}
}
}
}
}