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backlog.go
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backlog.go
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/*
Copyright IBM Corp. 2016 All Rights Reserved.
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 simplebft
import "fmt"
const maxBacklogSeq = 4
const msgPerSeq = 3 // (pre)prepare, commit, checkpoint
func (s *SBFT) testBacklogMessage(m *Msg, src uint64) bool {
test := func(seq *SeqView) bool {
if !s.activeView {
return true
}
if seq.Seq > s.cur.subject.Seq.Seq || seq.View > s.view {
return true
}
return false
}
if pp := m.GetPreprepare(); pp != nil {
return test(pp.Seq) && !s.cur.checkpointDone
} else if p := m.GetPrepare(); p != nil {
return test(p.Seq)
} else if c := m.GetCommit(); c != nil {
return test(c.Seq)
} else if chk := m.GetCheckpoint(); chk != nil {
return test(&SeqView{Seq: chk.Seq})
}
return false
}
func (s *SBFT) recordBacklogMsg(m *Msg, src uint64) {
if src == s.id {
panic(fmt.Sprintf("should never have to backlog my own message (replica ID: %d)", src))
}
s.replicaState[src].backLog = append(s.replicaState[src].backLog, m)
if len(s.replicaState[src].backLog) > maxBacklogSeq*msgPerSeq {
log.Debugf("replica %d: backlog for %d full, discarding and reconnecting", s.id, src)
s.discardBacklog(src)
s.sys.Reconnect(s.chainId, src)
}
}
func (s *SBFT) discardBacklog(src uint64) {
s.replicaState[src].backLog = nil
}
func (s *SBFT) processBacklog() {
processed := true
for processed {
processed = false
for src := range s.replicaState {
state := &s.replicaState[src]
src := uint64(src)
for len(state.backLog) > 0 {
m, rest := state.backLog[0], state.backLog[1:]
if s.testBacklogMessage(m, src) {
break
}
state.backLog = rest
log.Debugf("replica %d: processing stored message from %d: %s", s.id, src, m)
s.handleQueueableMessage(m, src)
processed = true
}
}
}
}