/
state.go
283 lines (255 loc) · 5.57 KB
/
state.go
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package syncer
import (
"sync"
"time"
"encoding/json"
"github.com/asaskevich/EventBus"
"github.com/pkg/errors"
"github.com/vitelabs/go-vite/interval/common"
"github.com/vitelabs/go-vite/interval/common/log"
"github.com/vitelabs/go-vite/interval/p2p"
)
type syncPeer struct {
peer p2p.Peer
msg *stateMsg
}
type syncTask struct {
height uint64
hash string
peer p2p.Peer
closed chan struct{}
done int
}
type state struct {
rw *chainRw
peers sync.Map
fetcher *fetcher
sender *sender
closed chan struct{}
wg sync.WaitGroup
syncNum int
firstTa *syncTask
p p2p.P2P
bus EventBus.Bus
}
type handState struct {
GenesisHash string
S peerState
}
func (se *state) GetState() (interface{}, error) {
return se.getHandState()
}
func (se *state) Handshake(peerId string, state []byte) error {
msg := &handState{}
err := json.Unmarshal(state, msg)
if err != nil {
return err
}
hs, err := se.getHandState()
if err != nil {
return err
}
if hs.GenesisHash != msg.GenesisHash {
return errors.New("Genesis diff, self[" + hs.GenesisHash + "], peer[" + msg.GenesisHash + "]")
}
if msg.S.Hash == "" {
return errors.New("Snapshot Hash empty.")
}
log.Info("handshake success, peer[%s] snapshot height:%d", peerId, msg.S.Height)
return nil
}
func (se *state) getHandState() (*handState, error) {
head, e := se.rw.HeadSnapshot()
if e != nil {
return nil, errors.New("get snapshot head block fail.")
}
genesis, e := se.rw.GenesisSnapshot()
if e != nil {
return nil, errors.New("get genesis block fail.")
}
msg := &handState{GenesisHash: genesis.Hash(), S: peerState{Height: head.Height(), Hash: head.Hash()}}
return msg, nil
}
func (se *state) DecodeState(state []byte) interface{} {
if state == nil {
return nil
}
msg := &handState{}
e := json.Unmarshal(state, msg)
if e != nil {
log.Error("DecodeState fail. err:%v", e)
return nil
}
return msg
}
func (se *state) EncodeState(state interface{}) []byte {
if state == nil {
return nil
}
b, e := json.Marshal(state)
if e != nil {
log.Error("EncodeState fail. err:%v", e)
return nil
}
return b
}
func newState(rw *chainRw, fetcher *fetcher, s *sender, p p2p.P2P, bus EventBus.Bus) *state {
self := &state{}
self.rw = rw
self.fetcher = fetcher
self.sender = s
self.closed = make(chan struct{})
self.p = p
self.firstTa = &syncTask{closed: make(chan struct{})}
self.bus = bus
return self
}
func (se *state) update(msg *stateMsg, peer p2p.Peer) {
//syncP := self.peers[peer.Id()]
//if syncP == nil {
// log.Warn("peer[%s] not exist", peer.Id())
// return
//}
//m := syncP.msg
//if m == nil {
// syncP.msg = m
//}
prevState := peer.GetState()
if prevState == nil {
log.Error("peer state is empty.", peer.Id())
} else {
state := prevState.(*handState)
state.S.Height = msg.Height
state.S.Hash = msg.Hash
}
head, e := se.rw.HeadSnapshot()
if e != nil {
log.Error("read snapshot head error:%v", e)
return
}
if msg.Height > head.Height() {
se.fetcher.fetchSnapshotBlockFromPeer(common.HashHeight{Hash: msg.Hash, Height: msg.Height}, peer)
}
}
func (se *state) peerConnected(peer p2p.Peer) {
se.peers.Store(peer.Id(), &syncPeer{peer: peer})
}
func (se *state) peerClosed(peer p2p.Peer) {
se.peers.Delete(peer.Id())
}
func (se *state) start() {
go se.loop()
go se.syncFirst()
}
func (se *state) loop() {
se.wg.Add(1)
defer se.wg.Done()
ticker := time.NewTicker(time.Second * 20)
for {
select {
case <-se.closed:
return
case <-ticker.C:
head, e := se.rw.HeadSnapshot()
if e != nil {
log.Error("read snapshot head error:%v", e)
continue
}
stateMsg := stateMsg{Hash: head.Hash(), Height: head.Height()}
log.Info("sync state, state:%v", stateMsg)
se.sender.broadcastState(stateMsg)
}
}
}
func (se *state) syncDone() bool {
return se.firstTa.done > 0
}
func (se *state) stop() {
close(se.closed)
se.wg.Wait()
}
func (se *state) syncFirst() {
se.wg.Add(1)
defer se.wg.Done()
ta := se.firstTa
t := time.NewTicker(time.Second * 2)
timeout := time.NewTicker(time.Second * 50)
NET:
for {
select {
case <-se.closed:
return
case <-ta.closed:
return
case <-timeout.C:
log.Info("link other node fail. but started.")
se.firstSyncDone()
case <-t.C:
i := 0
se.peers.Range(func(_, _ interface{}) bool {
i++
return true
})
if i > 0 {
p := se.bestPeer()
if p != nil {
s := p.GetState().(*handState)
ta.hash = s.S.Hash
ta.height = s.S.Height
ta.peer = p
break NET
}
}
}
}
head, e := se.rw.HeadSnapshot()
if e != nil {
log.Error("read snapshot head error:%v", e)
return
}
if head.Height() >= ta.height {
log.Info("need not sync, self height:%d, peer height:%d, peer id:%s", head.Height(), ta.height, ta.peer.Id())
se.firstSyncDone()
return
}
se.sender.requestSnapshotBlockByPeer(common.HashHeight{Hash: ta.hash, Height: ta.height}, ta.peer)
for {
select {
case <-se.closed:
return
case <-ta.closed:
return
case <-t.C:
head, e := se.rw.HeadSnapshot()
if e != nil {
log.Error("read snapshot head error:%v", e)
continue
}
if head.Height() > ta.height {
log.Info("sync first finish.")
se.firstSyncDone()
return
}
}
}
}
func (se *state) firstSyncDone() {
close(se.firstTa.closed)
se.firstTa.done = 1
se.bus.Publish(common.DwlDone)
}
func (se *state) bestPeer() p2p.Peer {
var r p2p.Peer
h := uint64(0)
se.peers.Range(func(_, p interface{}) bool {
p1 := p.(*syncPeer)
s := p1.peer.GetState().(*handState)
if s.S.Height > h {
r = p1.peer
h = s.S.Height
return true
}
return true
})
return r
}