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commit.go
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269 lines (209 loc) · 6.07 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 kayak
import (
"context"
"sync/atomic"
"github.com/pkg/errors"
kt "github.com/CovenantSQL/CovenantSQL/kayak/types"
"github.com/CovenantSQL/CovenantSQL/proto"
"github.com/CovenantSQL/CovenantSQL/utils/log"
"github.com/CovenantSQL/CovenantSQL/utils/timer"
"github.com/CovenantSQL/CovenantSQL/utils/trace"
)
func (r *Runtime) leaderCommitResult(ctx context.Context, tm *timer.Timer, reqPayload interface{}, prepareLog *kt.Log) (res *commitFuture) {
defer trace.StartRegion(ctx, "leaderCommitResult").End()
// decode log and send to commit channel to process
res = newCommitFuture()
if prepareLog == nil {
res.Set(&commitResult{err: errors.Wrap(kt.ErrInvalidLog, "nil prepare log in commit")})
return
}
// decode prepare log
req := &commitReq{
ctx: ctx,
data: reqPayload,
index: prepareLog.Index,
result: res,
tm: tm,
}
select {
case <-ctx.Done():
res = nil
case r.commitCh <- req:
}
return
}
func (r *Runtime) followerCommitResult(ctx context.Context, tm *timer.Timer, commitLog *kt.Log, prepareLog *kt.Log, lastCommit uint64) (res *commitFuture) {
defer trace.StartRegion(ctx, "followerCommitResult").End()
// decode log and send to commit channel to process
res = newCommitFuture()
if prepareLog == nil {
res.Set(&commitResult{err: errors.Wrap(kt.ErrInvalidLog, "nil prepare log in commit")})
return
}
myLastCommit := atomic.LoadUint64(&r.lastCommit)
// check committed index
if lastCommit < myLastCommit {
// leader pushed a early index before commit
log.WithFields(log.Fields{
"head": myLastCommit,
"supplied": lastCommit,
}).Warning("invalid last commit log")
res.Set(&commitResult{err: errors.Wrap(kt.ErrInvalidLog, "invalid last commit log index")})
return
}
// decode prepare log
var logReq interface{}
var err error
if logReq, err = r.doDecodePayload(ctx, prepareLog.Data); err != nil {
res.Set(&commitResult{err: errors.Wrap(err, "decode log payload failed")})
return
}
tm.Add("decode_payload")
req := &commitReq{
ctx: ctx,
data: logReq,
index: prepareLog.Index,
lastCommit: lastCommit,
result: res,
log: commitLog,
tm: tm,
}
select {
case <-ctx.Done():
case r.commitCh <- req:
}
return
}
func (r *Runtime) commitCycle() {
for {
var cReq *commitReq
select {
case <-r.stopCh:
return
case cReq = <-r.commitCh:
}
if cReq != nil {
r.doCommitCycle(cReq)
}
}
}
func (r *Runtime) leaderDoCommit(req *commitReq) {
if req.log != nil {
// mis-use follower commit for leader
log.Fatal("INVALID EXISTING LOG FOR LEADER COMMIT")
return
}
req.tm.Add("queue")
// create leader log
var (
l *kt.Log
logData []byte
cr = &commitResult{}
err error
)
logData = append(logData, r.uint64ToBytes(req.index)...)
logData = append(logData, r.uint64ToBytes(atomic.LoadUint64(&r.lastCommit))...)
if l, err = r.newLog(req.ctx, kt.LogCommit, logData); err != nil {
// serve error, leader could not write log
return
}
req.tm.Add("write_wal")
// not wrapping underlying handler commit error
cr.result, err = r.doCommit(req.ctx, req.data, true)
req.tm.Add("db_write")
// mark last commit
atomic.StoreUint64(&r.lastCommit, l.Index)
// send commit
cr.rpc = r.applyRPC(l, r.minCommitFollowers)
cr.index = l.Index
cr.err = err
// TODO(): text log for rpc errors
// TODO(): mark uncommitted nodes and remove from peers
req.result.Set(cr)
req.tm.Add("send_follower_commit")
return
}
func (r *Runtime) followerDoCommit(req *commitReq) {
if req.log == nil {
log.Fatal("NO LOG FOR FOLLOWER COMMIT")
return
}
waitCommitTask := trace.StartRegion(req.ctx, "waitForLastCommit")
// check for last commit availability
myLastCommit := atomic.LoadUint64(&r.lastCommit)
if req.lastCommit != myLastCommit {
// TODO(): need counter for retries, infinite commit re-order would cause troubles
go func(req *commitReq) {
_, _ = r.waitForLog(req.ctx, req.lastCommit)
r.commitCh <- req
}(req)
waitCommitTask.End()
return
}
waitCommitTask.End()
req.tm.Add("queue")
defer trace.StartRegion(req.ctx, "commitCycle").End()
var err error
// write log first
if err = r.writeWAL(req.ctx, req.log); err != nil {
return
}
req.tm.Add("write_wal")
// do commit, not wrapping underlying handler commit error
_, storageErr := r.doCommit(req.ctx, req.data, false)
req.tm.Add("db_write")
// mark last commit
atomic.StoreUint64(&r.lastCommit, req.log.Index)
req.result.Set(&commitResult{
err: err,
storageErr: storageErr,
})
return
}
func (r *Runtime) getPrepareLog(ctx context.Context, l *kt.Log) (lastCommitIndex uint64, pl *kt.Log, err error) {
defer trace.StartRegion(ctx, "getPrepareLog").End()
var prepareIndex uint64
// decode prepare index
if prepareIndex, err = r.bytesToUint64(l.Data); err != nil {
err = errors.Wrap(err, "log does not contain valid prepare index")
return
}
if pl, err = r.waitForLog(ctx, prepareIndex); err != nil {
err = errors.Wrap(err, "wait for prepare log failed")
return
}
// decode commit index
if len(l.Data) >= 16 {
lastCommitIndex, _ = r.bytesToUint64(l.Data[8:])
if _, err = r.waitForLog(ctx, lastCommitIndex); err != nil {
err = errors.Wrap(err, "wait for last commit log failed")
return
}
}
return
}
func (r *Runtime) doCommitCycle(req *commitReq) {
r.peersLock.RLock()
defer r.peersLock.RUnlock()
if r.role == proto.Leader {
defer trace.StartRegion(req.ctx, "commitCycle").End()
r.leaderDoCommit(req)
} else {
r.followerDoCommit(req)
}
}