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// Copyright 2017-2019 Lei Ni (nilei81@gmail.com)
//
// 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 dragonboat
import (
"sync"
"github.com/lni/dragonboat/internal/utils/logutil"
"github.com/lni/dragonboat/raftio"
)
var (
feedbackPushDelayTick uint64 = 20000
feedbackConfirmedDelayTick uint64 = 1500
feedbackRetryDelayTick uint64 = 200
)
type snapshotStatus struct {
clusterID uint64
nodeID uint64
releaseTick uint64
failed bool
}
type pushfunc func(clusterID uint64, nodeID uint64, failed bool) bool
type snapshotFeedback struct {
mu sync.Mutex
pendings map[raftio.NodeInfo]snapshotStatus
pf pushfunc
}
func newSnapshotFeedback(f pushfunc) *snapshotFeedback {
p := &snapshotFeedback{
pendings: make(map[raftio.NodeInfo]snapshotStatus),
pf: f,
}
return p
}
func (p *snapshotFeedback) pushReady(tick uint64) {
ready := p.getReady(tick)
if len(ready) == 0 {
return
}
notDelivered := make([]snapshotStatus, 0)
for _, s := range ready {
if !p.pf(s.clusterID, s.nodeID, s.failed) {
plog.Debugf("snapshot status to %s not delivered",
logutil.DescribeNode(s.clusterID, s.nodeID))
notDelivered = append(notDelivered, s)
} else {
plog.Debugf("snapshot status to %s pushed",
logutil.DescribeNode(s.clusterID, s.nodeID))
}
}
p.addRetry(notDelivered, tick)
}
func (p *snapshotFeedback) getReady(tick uint64) []snapshotStatus {
p.mu.Lock()
defer p.mu.Unlock()
var results []snapshotStatus
for _, st := range p.pendings {
if st.releaseTick < tick {
results = append(results, st)
}
}
for _, st := range results {
key := raftio.GetNodeInfo(st.clusterID, st.nodeID)
delete(p.pendings, key)
}
return results
}
func (p *snapshotFeedback) addStatus(clusterID uint64,
nodeID uint64, failed bool, tick uint64) {
p.mu.Lock()
defer p.mu.Unlock()
plog.Debugf("snapshot status to %s has been added",
logutil.DescribeNode(clusterID, nodeID))
s := snapshotStatus{
clusterID: clusterID,
nodeID: nodeID,
releaseTick: tick + feedbackPushDelayTick,
failed: failed,
}
cn := raftio.GetNodeInfo(clusterID, nodeID)
p.pendings[cn] = s
}
func (p *snapshotFeedback) addRetry(notDelivered []snapshotStatus,
tick uint64) {
p.mu.Lock()
defer p.mu.Unlock()
for _, st := range notDelivered {
s := snapshotStatus{
clusterID: st.clusterID,
nodeID: st.nodeID,
releaseTick: tick + feedbackRetryDelayTick,
failed: st.failed,
}
cn := raftio.GetNodeInfo(st.clusterID, st.nodeID)
p.pendings[cn] = s
}
}
func (p *snapshotFeedback) confirm(clusterID uint64,
nodeID uint64, tick uint64) {
p.mu.Lock()
defer p.mu.Unlock()
plog.Debugf("snapshot status to %s has been confirmed",
logutil.DescribeNode(clusterID, nodeID))
cn := raftio.GetNodeInfo(clusterID, nodeID)
s := snapshotStatus{
clusterID: clusterID,
nodeID: nodeID,
releaseTick: tick + feedbackConfirmedDelayTick,
failed: false,
}
p.pendings[cn] = s
}