/
server.go
267 lines (236 loc) · 6.82 KB
/
server.go
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package grpc
import (
"context"
"fmt"
"net"
"net/http"
"strings"
"sync"
"time"
grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
"github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc"
"github.com/labstack/gommon/log"
"github.com/manmanxing/go_common/beacon"
myEtcd "github.com/manmanxing/go_common/beacon/etcd"
"github.com/opentracing/opentracing-go"
etcd "go.etcd.io/etcd/clientv3"
etcdnaming "go.etcd.io/etcd/clientv3/naming"
etcdrpctypes "go.etcd.io/etcd/etcdserver/api/v3rpc/rpctypes"
"google.golang.org/grpc"
"google.golang.org/grpc/keepalive"
grpcnaming "google.golang.org/grpc/naming"
"google.golang.org/grpc/reflection"
)
const ServiceLeaseTTL = 3
type ServiceRegister func(s *grpc.Server)
type Server struct {
target string
host string
port int
grpcServer *grpc.Server
closeNotifyCh chan struct{} //服务关闭 channel 通知
mutex sync.Mutex
stopped bool //标志grpc server 是否关闭
etcdLease etcd.Lease
etcdClient *etcd.Client // 进程级别的 etcd.Client, 无需关闭
}
func NewServer(target, host string, port int, register ServiceRegister) *Server {
return NewServerWithOption(
target,
host,
port,
register,
grpc.RPCCompressor(grpc.NewGZIPCompressor()),
grpc.RPCDecompressor(grpc.NewGZIPDecompressor()),
grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(
otgrpc.OpenTracingServerInterceptor(opentracing.GlobalTracer(), otgrpc.LogPayloads()),
unaryServerInterceptor,
)),
//这个连接最大的空闲时间,超过就释放,解决proxy等到网络问题(不通知grpc的client和server)
grpc.KeepaliveParams(keepalive.ServerParameters{
MaxConnectionIdle: 5 * time.Minute,
}),
)
}
func NewServerWithOption(target, host string, port int, register ServiceRegister, opt ...grpc.ServerOption) *Server {
srv := grpc.NewServer(opt...)
register(srv)
//开启refletion,方便grpcurl使用
reflection.Register(srv)
return &Server{
target: target,
host: host,
port: port,
grpcServer: srv,
closeNotifyCh: make(chan struct{}),
}
}
func (s *Server) Serve() (err error) {
s.mutex.Lock()
if s.stopped {
s.mutex.Unlock()
return grpc.ErrServerStopped
}
if s.etcdClient == nil {
s.etcdClient, err = myEtcd.NewClient()
if err != nil {
s.mutex.Unlock()
return err
}
}
if len(strings.TrimSpace(s.host)) <= 0 {
s.host, err = beacon.ServiceHost()
if err != nil {
s.mutex.Unlock()
return err
}
}
s.mutex.Unlock()
//开始建立 tcp 连接
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", s.port))
if err != nil {
return err
}
cancelLoopCh := make(chan struct{})
defer func() {
close(cancelLoopCh)
}()
//新起一个协程进行etcd续约
go s.registerServiceToEtcdLoop(cancelLoopCh)
//这里return之前,一定会有一个准备好的连接
return s.grpcServer.Serve(lis)
}
func (s *Server) registerServiceToEtcdLoop(cancelLoopCh <-chan struct{}) {
select {
case <-cancelLoopCh:
return
case <-s.closeNotifyCh:
return
case <-time.After(time.Millisecond * 10): //10毫秒后listen 至少已经监听过一次连接了
}
leaseKeepAliveResponseChan, leaseId, err := s.registerServiceToEtcd()
if err != nil {
panic(err)
}
for {
select {
case <-cancelLoopCh:
if err = s.etcdLeaseClose(leaseId); err != nil {
log.Error("Server.etcdLeaseClose()", leaseId, "error", err.Error())
}
log.Info("server.etcd", "cancelLoopCh")
return
case <-s.closeNotifyCh:
if err = s.etcdLeaseClose(leaseId); err != nil {
log.Error("Server.etcdLeaseClose()", leaseId, "error", err.Error())
}
log.Info("server.etcd", "cancelLoopCh")
return
case _, ok := <-leaseKeepAliveResponseChan: //一般情况下,都是间隔500ms一次心跳
if ok {
log.Info("leaseKeepAliveResponseChan", ok)
continue
}
//到这里说明已经收不到心跳了,那就关闭旧的租约,开启一个新的租约
if err = s.etcdLeaseClose(leaseId); err != nil {
log.Error("etcd close lease err ", err, " lease id ", leaseId)
return
}
time.Sleep(time.Second)
ch, id, err := s.registerServiceToEtcd()
if err != nil {
log.Error("Server.registerServiceToEtcd()", err.Error())
continue
}
leaseKeepAliveResponseChan, leaseId = ch, id
}
}
}
func (s *Server) etcdLeaseClose(id etcd.LeaseID) error {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.etcdClient == nil {
return nil
}
//请求 etcd 撤销租约
ctx, cancel := context.WithTimeout(s.etcdClient.Ctx(), time.Second*5)
defer cancel()
_, err := s.etcdClient.Revoke(ctx, id)
if err != nil && err != context.DeadlineExceeded && err != context.Canceled && err != etcdrpctypes.ErrLeaseNotFound {
log.Error("etcd revoke err ", err.Error(), " etcd lease id ", id)
}
//请求 etcd 关闭租约
err = s.etcdClient.Close()
if err != nil {
return err
}
s.etcdClient = nil
return nil
}
func (s *Server) registerServiceToEtcd() (res <-chan *etcd.LeaseKeepAliveResponse, leaseId etcd.LeaseID, err error) {
addr := ""
defer func() {
log.Info("registerServiceToEtcd", err, " leaseId", leaseId, " addr", addr)
}()
s.mutex.Lock()
defer s.mutex.Unlock()
//如果etcd租约不为nil,先关闭,再置为nil
if s.etcdLease != nil {
if err = s.etcdLease.Close(); err != nil {
return nil, 0, err
}
s.etcdLease = nil
}
//生成新的 etcd 租约
s.etcdLease = etcd.NewLease(s.etcdClient)
ctx, cancel := context.WithTimeout(s.etcdClient.Ctx(), time.Second*5)
defer cancel()
leaseGrantResponse, err := s.etcdLease.Grant(ctx, ServiceLeaseTTL)
if err != nil {
return nil, 0, err
}
//获取grpc名词解析器
resolver := etcdnaming.GRPCResolver{Client: s.etcdClient}
addr = fmt.Sprintf("%s:%d", s.host, s.port)
idStr := fmt.Sprintf("%v", leaseGrantResponse.ID)
update := grpcnaming.Update{
Op: grpcnaming.Add,
Addr: addr,
Metadata: idStr,
}
//这里的 target 是 root/service/xxx(服务名)/leaseId
target := "root/service/" + s.target + "/" + idStr
if err = resolver.Update(ctx, target, update, etcd.WithLease(leaseGrantResponse.ID)); err != nil {
return nil, 0, err
}
if res, err = s.etcdLease.KeepAlive(context.Background(), leaseGrantResponse.ID); err != nil {
return nil, 0, err
}
return res, leaseGrantResponse.ID, nil
}
func (s *Server) RegisterService(sd *grpc.ServiceDesc, ss interface{}) {
s.grpcServer.RegisterService(sd, ss)
}
func (s *Server) GetServiceInfo() map[string]grpc.ServiceInfo {
return s.grpcServer.GetServiceInfo()
}
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
s.grpcServer.ServeHTTP(w, r)
}
func (s *Server) GracefulStop() {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.stopped {
return
}
s.stopped = true
close(s.closeNotifyCh)
if s.etcdLease != nil {
if err := s.etcdLease.Close(); err != nil {
log.Error("Server.etcdLease.Close()", err.Error())
} else {
s.etcdLease = nil
}
}
s.grpcServer.GracefulStop()
}