/
server.go
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/
server.go
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// Copyright 2016 DeepFabric, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package pdserver
import (
"sync"
"sync/atomic"
"time"
"github.com/coreos/etcd/embed"
"github.com/fagongzi/log"
"github.com/deepfabric/elasticell/pkg/pd"
"google.golang.org/grpc"
)
// Server the pd server
type Server struct {
cfg *Cfg
// etcd fields
id uint64
etcd *embed.Etcd
// rpc fields
rpcServer *grpc.Server
store Store
// cluster fields
isLeaderValue int64
leaderSignature string
clusterID uint64
cluster *CellCluster
leaderProxy *pd.Client
leaderMux sync.RWMutex
idAlloc *idAllocator
notifier *watcherNotifier
// status
callStop bool
closed int64
// stop fields
stopOnce sync.Once
stopWG sync.WaitGroup
stopC chan interface{}
complete chan struct{}
}
// NewServer create a pd server
func NewServer(cfg *Cfg) *Server {
s := new(Server)
s.cfg = cfg
s.stopC = make(chan interface{})
s.isLeaderValue = 0
s.complete = make(chan struct{})
s.notifier = newWatcherNotifier(cfg.DurationHeartbeatWatcher * time.Duration(cfg.ThresholdPauseWatcher))
return s
}
// Name returns name of current pd server
func (s *Server) Name() string {
return s.cfg.Name
}
// Start start the pd server
func (s *Server) Start() {
go s.listenToStop()
go s.startRPC()
s.startEmbedEtcd()
s.initCluster()
s.setServerIsStarted()
go s.startLeaderLoop()
s.notifier.start()
<-s.complete
close(s.complete)
s.complete = nil
}
// Stop the server
func (s *Server) Stop() {
s.stopWG.Add(1)
s.stopC <- ""
s.stopWG.Wait()
}
func (s *Server) listenToStop() {
<-s.stopC
defer s.stopWG.Done()
s.doStop()
}
func (s *Server) doStop() {
s.stopOnce.Do(func() {
s.callStop = true
s.closeRPC()
s.closeEmbedEtcd()
s.setServerIsStopped()
s.notifier.stop()
})
}
func (s *Server) notifyElectionComplete() {
if s.complete != nil {
s.complete <- struct{}{}
}
}
// GetCfg returns cfg, just for test
func (s *Server) GetCfg() *Cfg {
return s.cfg
}
func (s *Server) initCluster() {
clusterID, err := s.store.GetClusterID()
if err != nil {
log.Fatalf("bootstrap: get cluster id failure, errors:\n %+v", err)
return
}
log.Infof("bootstrap: get cluster id, clusterID=<%d>", clusterID)
if clusterID == pd.ZeroID {
clusterID, err = s.store.CreateFirstClusterID()
if err != nil {
log.Fatalf("bootstrap: create first cluster id failure, errors:\n %+v", err)
return
}
log.Infof("bootstrap: first clusterID created, clusterID=<%d>", clusterID)
}
s.clusterID = clusterID
s.idAlloc = newIDAllocator(s.store, func() string {
return s.leaderSignature
})
s.cluster = newCellCluster(s)
}
func (s *Server) isClosed() bool {
return atomic.LoadInt64(&s.closed) == 1
}
func (s *Server) setServerIsStopped() {
atomic.StoreInt64(&s.closed, 1)
}
func (s *Server) setServerIsStarted() {
atomic.StoreInt64(&s.closed, 0)
}