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Copy pathworker.go
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171 lines (144 loc) · 3.33 KB
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/*
* Copyright 2019 The CovenantSQL Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package observer
import (
"errors"
"sync"
"sync/atomic"
"time"
"github.com/CovenantSQL/CovenantSQL/conf"
"github.com/CovenantSQL/CovenantSQL/proto"
"github.com/CovenantSQL/CovenantSQL/route"
"github.com/CovenantSQL/CovenantSQL/utils/log"
"github.com/CovenantSQL/CovenantSQL/worker"
)
type subscribeWorker struct {
l sync.Mutex
s *Service
dbID proto.DatabaseID
head int32
wg *sync.WaitGroup
stopCh chan struct{}
}
func newSubscribeWorker(dbID proto.DatabaseID, head int32, s *Service) *subscribeWorker {
return &subscribeWorker{
dbID: dbID,
head: head,
s: s,
}
}
func (w *subscribeWorker) run() {
defer w.wg.Done()
// calc next tick
var nextTick time.Duration
for {
select {
case <-w.stopCh:
return
case <-time.After(nextTick):
if err := w.pull(w.getHead()); err != nil {
// calc next tick
nextTick = conf.GConf.SQLChainPeriod
} else {
nextTick /= 10
}
}
}
}
func (w *subscribeWorker) pull(count int32) (err error) {
var (
req = new(worker.ObserverFetchBlockReq)
resp = new(worker.ObserverFetchBlockResp)
next int32
)
defer func() {
lf := log.WithFields(log.Fields{
"req_count": count,
"count": resp.Count,
})
if err != nil {
lf.WithError(err).Debug("sync block failed")
} else {
if resp.Block != nil {
lf = lf.WithField("block", resp.Block.BlockHash())
} else {
lf = lf.WithField("block", nil)
}
lf.WithField("next", next).Debug("sync block success")
}
}()
req.DatabaseID = w.dbID
req.Count = count
if err = w.s.minerRequest(w.dbID, route.DBSObserverFetchBlock.String(), req, resp); err != nil {
return
}
if resp.Block == nil {
err = errors.New("nil block, try later")
return
}
if err = w.s.addBlock(w.dbID, count, resp.Block); err != nil {
return
}
if count < 0 {
next = resp.Count + 1
} else {
next = count + 1
}
if atomic.CompareAndSwapInt32(&w.head, count, next) {
// update subscription status to database
_ = w.s.saveSubscriptionStatus(w.dbID, next)
}
return
}
func (w *subscribeWorker) reset(head int32) {
atomic.StoreInt32(&w.head, head)
w.start()
}
func (w *subscribeWorker) start() {
w.l.Lock()
defer w.l.Unlock()
// update subscription status to database
_ = w.s.saveSubscriptionStatus(w.dbID, w.getHead())
if w.isStopped() {
w.stopCh = make(chan struct{})
w.wg = new(sync.WaitGroup)
w.wg.Add(1)
go w.run()
}
}
func (w *subscribeWorker) getHead() int32 {
return atomic.LoadInt32(&w.head)
}
func (w *subscribeWorker) stop() {
w.l.Lock()
defer w.l.Unlock()
if !w.isStopped() {
// stop
close(w.stopCh)
w.wg.Wait()
}
}
func (w *subscribeWorker) isStopped() bool {
if w.stopCh == nil {
return true
}
select {
case <-w.stopCh:
return true
default:
return false
}
}