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server.go
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server.go
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package micro
import (
"context"
"github.com/uzziahlin/micro/registry"
"google.golang.org/grpc"
"net"
"time"
)
type ServerOption func(server *Server)
// Server 对RPC服务端的抽象, 对grpc.Server进行封装
// 启动的时候会自身的实例信息注册给注册中心(如果指定了注册中心的话)
// 如果没指定注册中心,则会直接监听端口
type Server struct {
*grpc.Server
serviceName string
addr string
registry registry.Registry
si *registry.ServiceInstance
registerTimeout time.Duration
listener net.Listener
weight int
group string
}
func NewServer(serviceName string, opts ...ServerOption) (*Server, error) {
server := grpc.NewServer()
res := &Server{
Server: server,
serviceName: serviceName,
registerTimeout: 3 * time.Second,
}
for _, opt := range opts {
opt(res)
}
return res, nil
}
func ServerWithRegistry(registry registry.Registry) ServerOption {
return func(server *Server) {
server.registry = registry
}
}
func ServerWithWeight(w int) ServerOption {
return func(server *Server) {
server.weight = w
}
}
func ServerWithGroup(g string) ServerOption {
return func(server *Server) {
server.group = g
}
}
// Start 启动服务,如果指定了注册中心,则会将自身的实例信息注册到注册中心
// 否则则会直接启动服务
func (s *Server) Start(addr string) error {
// 监听端口
listener, err := net.Listen("tcp", addr)
s.addr = addr
s.listener = listener
if err != nil {
return err
}
if s.registry != nil {
err := s.registerSelf()
if err != nil {
return err
}
}
return s.Serve(listener)
}
func (s *Server) registerSelf() error {
ctx, cancel := context.WithTimeout(context.Background(), s.registerTimeout)
defer cancel()
s.si = ®istry.ServiceInstance{
ServiceName: s.serviceName,
Addr: s.addr,
Weight: s.weight,
Group: s.group,
}
// 将自己注册到注册中心
return s.registry.Register(ctx, s.si)
}
func (s *Server) Close() error {
if s.registry != nil {
ctx, cancel := context.WithTimeout(context.Background(), s.registerTimeout)
defer cancel()
err := s.registry.Unregister(ctx, s.si)
if err != nil {
return err
}
}
if s.listener != nil {
err := s.listener.Close()
if err != nil {
return err
}
}
return nil
}