/
server.go
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/
server.go
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// Copyright 2018 vip.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,
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"net"
"net/url"
"sync"
"encoding/binary"
defaultLog "log"
"math/rand"
"time"
"io/ioutil"
"net/http"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/vipshop/vdl/consensus/raftgroup"
"github.com/vipshop/vdl/pkg/glog"
"github.com/vipshop/vdl/pkg/jsonutil"
apiutil "github.com/vipshop/vdl/server/adminapi/util"
"github.com/vipshop/vdl/server/kafka"
"github.com/vipshop/vdl/server/metricsserver"
"github.com/vipshop/vdl/server/runtimeconfig"
"github.com/vipshop/vdl/server/servererror"
"github.com/vipshop/vdl/stablestore"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
var (
stable_key_raft_group_key = "vdlserver-raftgroup"
stable_key_server_id = "vdlserver-id"
)
var (
VDLServerGlobal *VDLServer
)
type VDLServer struct {
rwLock *sync.RWMutex
streamMap map[string]*raftgroup.RaftGroup
// listen url for admin
AdminListener *listener
// listen url for metrics
MetricsListener *listener
//server config
ServerConfig *ServerConfig
//Runtime config
RuntimeConfig *runtimeconfig.RuntimeConfig
RuntimeConfigStore *runtimeconfig.RuntimeConfigStore
//persistent for membership/voted id/etc..
StableStore stablestore.StableStore
// server id, which is generate random
ServerID int32
// chan for shutdown
ShutdownCh chan struct{}
// is new server
IsNewServer bool
// wait group for shutdown
Wg sync.WaitGroup
// kafka server
kafkaServer *kafka.Server
// metrics server
metricsServer *metricsserver.MetricsServer
// use to stop method to close once
closeOnce sync.Once
stoped chan struct{}
}
type listener struct {
net.Listener
serve func() error
close func(context.Context) error
}
func NewVDLServer(conf *ServerConfig, metricsConfig *metricsserver.MetricsServerConfig) (*VDLServer, error) {
if err := conf.ValidateServerConfig(); err != nil {
return nil, err
}
// create stable store
stableStore, err := stablestore.NewBoltDBStore(&stablestore.BoltDBStoreConfig{Dir: conf.StableStoreDir})
if err != nil {
return nil, err
}
// get or create server id
serverID, isCreate, err := getOrCreateServerID(stableStore)
if err != nil {
return nil, err
}
VDLServerGlobal = &VDLServer{
rwLock: new(sync.RWMutex),
streamMap: make(map[string]*raftgroup.RaftGroup),
ServerConfig: conf,
StableStore: stableStore,
ServerID: serverID,
IsNewServer: isCreate,
ShutdownCh: make(chan struct{}),
stoped: make(chan struct{}),
}
// get or create runtime config
runtimeConfigStore := runtimeconfig.NewRuntimeConfigStore(stableStore)
runtimeConfig := runtimeConfigStore.GetOrCreateRuntimeConfig()
VDLServerGlobal.RuntimeConfigStore = runtimeConfigStore
VDLServerGlobal.RuntimeConfig = runtimeConfig
// new kafka server
kafkaServer, err := kafka.NewServer(conf.ClientListenerAddress, conf.ConnectionsMaxIdle, VDLServerGlobal, VDLServerGlobal.RuntimeConfig)
if err != nil {
return nil, err
}
VDLServerGlobal.kafkaServer = kafkaServer
// new metrics server
metricsServer := metricsserver.NewMetricsServer(metricsConfig)
VDLServerGlobal.metricsServer = metricsServer
return VDLServerGlobal, nil
}
func (l *VDLServer) Start() (err error) {
defer func() {
if err != nil {
if l.AdminListener != nil && l.AdminListener.Listener != nil {
l.AdminListener.Close()
glog.Info("stopping listening for admin requests on ", l.AdminListener)
}
if l.MetricsListener != nil && l.MetricsListener.Listener != nil {
l.MetricsListener.Close()
glog.Info("stopping listening for metrics requests on ", l.MetricsListener)
}
}
}()
//start client listener
if err = l.startAdminListener(); err != nil {
return err
}
//start metrics listener
if err = l.startMetricsListener(); err != nil {
return err
}
return nil
}
// stop should be call from kill signal or stop cmd
func (l *VDLServer) Stop() {
l.closeOnce.Do(func() { close(l.ShutdownCh) })
<-l.stoped
}
// wait until stop
func (l *VDLServer) Serve() error {
// store server ID
if l.IsNewServer {
b := make([]byte, 4)
binary.BigEndian.PutUint32(b, uint32(l.ServerID))
err := l.StableStore.Put([]byte(stable_key_server_id), b)
if err != nil {
return err
}
}
// start metrics server
l.Wg.Add(1)
go func() {
l.metricsServer.Start()
l.Wg.Done()
}()
// if kafka server cannot start, shutdown first and then return to stop vdl server
kafkaStartErrorChan := make(chan error)
l.Wg.Add(1)
go func() {
startErr := l.kafkaServer.Start()
l.Wg.Done()
if startErr != nil {
kafkaStartErrorChan <- startErr
}
}()
select {
case err := <-kafkaStartErrorChan:
l.shutdown()
return err
case <-l.ShutdownCh:
l.shutdownKafka()
l.shutdown()
return nil
}
return nil
}
func (l *VDLServer) shutdownKafka() {
glog.Info("shutting down kafka server")
if err := l.kafkaServer.Close(); err != nil {
glog.Warningf("can not close AdminListener [%s] ",
l.AdminListener.Listener.Addr().String())
}
glog.Info("kafka server shutdown")
glog.Flush()
}
func (l *VDLServer) shutdown() {
glog.Info("shutting down Metrics Server")
l.metricsServer.Stop()
glog.Info("Metrics Server shutdown")
if err := l.AdminListener.close(context.Background()); err != nil {
glog.Warningf("can not close AdminListener [%s] ",
l.AdminListener.Listener.Addr().String())
}
glog.Info("AdminListener shutdown")
glog.Info("shutting down MetricsListener")
if err := l.MetricsListener.close(context.Background()); err != nil {
glog.Warningf("can not close MetricsListener [%s] ",
l.MetricsListener.Listener.Addr().String())
}
glog.Info("MetricsListener shutdown")
l.Wg.Wait()
l.rwLock.Lock()
defer l.rwLock.Unlock()
for _, v := range l.streamMap {
glog.Info("shutting down raftgroup:", v.GroupConfig.GroupName)
if err := v.Stop(); err != nil {
glog.Warning("can not close raft group", err)
}
glog.Info("raftgroup[", v.GroupConfig.GroupName, "] shutdown:")
}
glog.Info("shutting down StableStore")
if err := l.StableStore.Close(); err != nil {
glog.Warning("can not close StableStore", err)
}
glog.Info("StableStore shutdown")
glog.Flush()
l.stoped <- struct{}{}
}
func (l *VDLServer) AddRaftGroup(groupName string, conf *raftgroup.GroupConfig) (newGroup *raftgroup.RaftGroup, err error) {
l.rwLock.Lock()
defer l.rwLock.Unlock()
if l.streamMap[groupName] != nil {
return nil, servererror.ErrStreamAlreadyExists
}
conf.VDLServerName = l.ServerConfig.ServerName
conf.VDLServerID = l.ServerID
addr, err := net.ResolveTCPAddr("tcp", l.ServerConfig.ClientListenerAddress)
if err != nil {
return nil, err
}
conf.VDLClientListenerHost = addr.IP.String()
conf.VDLClientListenerPort = int32(addr.Port)
if newGroup, err = raftgroup.NewRaftGroup(conf, l.StableStore); err != nil {
return nil, err
}
if err = newGroup.Start(); err != nil {
return nil, err
}
l.streamMap[groupName] = newGroup
l.StableStore.Put([]byte(stable_key_raft_group_key), jsonutil.MustMarshal(l.streamMap))
return
}
func (l *VDLServer) GetRaftGroup(groupName string) (*raftgroup.RaftGroup, error) {
l.rwLock.RLock()
defer l.rwLock.RUnlock()
if l.streamMap[groupName] == nil {
return nil, servererror.ErrStreamNotExists
}
return l.streamMap[groupName], nil
}
func (l *VDLServer) GetLogStreamWrapper(groupName string) (raftgroup.LogStreamWrapper, error) {
l.rwLock.RLock()
defer l.rwLock.RUnlock()
if l.streamMap[groupName] == nil {
return nil, servererror.ErrStreamNotExists
}
return l.streamMap[groupName], nil
}
func (l *VDLServer) GetAllLogStreamNames() []string {
l.rwLock.RLock()
defer l.rwLock.RUnlock()
logStreamNames := make([]string, 0, 8)
for name, _ := range l.streamMap {
logStreamNames = append(logStreamNames, name)
}
return logStreamNames
}
func (l *VDLServer) GetRuntimeConfig() *runtimeconfig.RuntimeConfig {
return l.RuntimeConfig
}
func (l *VDLServer) GetRuntimeConfigStore() *runtimeconfig.RuntimeConfigStore {
return l.RuntimeConfigStore
}
func (l *VDLServer) startAdminListener() (err error) {
adminListenerUrl, _ := url.Parse(l.ServerConfig.AdminListenerAddress)
var adminListener net.Listener
if adminListener, err = net.Listen("tcp", adminListenerUrl.Host); err != nil {
return err
}
grpcServer := grpc.NewServer()
apiutil.RegisterServer(grpcServer, l, l)
l.AdminListener = &listener{
Listener: adminListener,
close: func(context.Context) error {
grpcServer.GracefulStop()
return nil
},
serve: func() error {
return grpcServer.Serve(adminListener)
},
}
glog.Info("listening for admin requests on ", adminListenerUrl)
l.Wg.Add(1)
go func() {
l.AdminListener.serve()
l.Wg.Done()
}()
return nil
}
func (l *VDLServer) startMetricsListener() (err error) {
metricsListenerListenerUrl, _ := url.Parse(l.ServerConfig.MetricsListenerAddress)
var metricsListener net.Listener
if metricsListener, err = net.Listen("tcp", metricsListenerListenerUrl.Host); err != nil {
return err
}
mux := http.NewServeMux()
mux.Handle("/metrics", promhttp.Handler())
server := &http.Server{
Handler: mux,
ReadTimeout: 5 * time.Minute,
ErrorLog: defaultLog.New(ioutil.Discard, "", 0), // do not log user error
}
l.MetricsListener = &listener{
Listener: metricsListener,
close: func(ctx context.Context) error {
return server.Shutdown(ctx)
},
serve: func() error {
return server.Serve(metricsListener)
},
}
glog.Info("listening for metrics requests on ", metricsListenerListenerUrl.Host)
l.Wg.Add(1)
go func() {
l.MetricsListener.serve()
l.Wg.Done()
}()
return nil
}
func getOrCreateServerID(stableStore stablestore.StableStore) (serverID int32, isCreate bool, err error) {
serverID = 0
isCreate = false
var b []byte
// get from store
b, err = stableStore.Get([]byte(stable_key_server_id))
if err != nil {
return serverID, isCreate, err
}
// not exists in store
if b == nil || len(b) == 0 {
isCreate = true
random := rand.New(rand.NewSource(time.Now().UnixNano()))
serverID = random.Int31()
return serverID, isCreate, nil
} else {
return int32(binary.BigEndian.Uint32(b)), isCreate, nil
}
}