138 lines
3.2 KiB
Go
138 lines
3.2 KiB
Go
/*
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Server represents a server instance in go-micro which handles synchronous
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requests via handlers and asynchronous requests via subscribers that
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register with a broker.
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The server combines the all the packages in go-micro to create a whole unit
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used for building applications including discovery, client/server communication
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and pub/sub.
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*/
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package server
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import (
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"os"
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"os/signal"
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"syscall"
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log "github.com/golang/glog"
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"github.com/pborman/uuid"
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)
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type Server interface {
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Config() options
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Init(...Option)
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Handle(Handler) error
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NewHandler(interface{}) Handler
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NewSubscriber(string, interface{}) Subscriber
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Subscribe(Subscriber) error
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Register() error
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Deregister() error
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Start() error
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Stop() error
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}
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type Option func(*options)
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var (
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DefaultAddress = ":0"
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DefaultName = "go-server"
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DefaultVersion = "1.0.0"
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DefaultId = uuid.NewUUID().String()
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DefaultServer Server = newRpcServer()
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)
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// Returns config options for the default service
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func Config() options {
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return DefaultServer.Config()
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}
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// Initialises the default server with options passed in
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func Init(opt ...Option) {
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if DefaultServer == nil {
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DefaultServer = newRpcServer(opt...)
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}
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DefaultServer.Init(opt...)
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}
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// Returns a new server with options passed in
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func NewServer(opt ...Option) Server {
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return newRpcServer(opt...)
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}
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// Creates a new subscriber interface with the given topic
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// and handler using the default server
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func NewSubscriber(topic string, h interface{}) Subscriber {
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return DefaultServer.NewSubscriber(topic, h)
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}
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// Creates a new handler interface using the default server
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// Handlers are required to be a public object with public
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// methods. Call to a service method such as Foo.Bar expects
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// the type:
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//
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// type Foo struct {}
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// func (f *Foo) Bar(ctx, req, rsp) error {
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// return nil
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// }
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//
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func NewHandler(h interface{}) Handler {
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return DefaultServer.NewHandler(h)
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}
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// Registers a handler interface with the default server to
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// handle inbound requests
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func Handle(h Handler) error {
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return DefaultServer.Handle(h)
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}
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// Registers a subscriber interface with the default server
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// which subscribes to specified topic with the broker
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func Subscribe(s Subscriber) error {
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return DefaultServer.Subscribe(s)
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}
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// Registers the default server with the discovery system
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func Register() error {
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return DefaultServer.Register()
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}
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// Deregisters the default server from the discovery system
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func Deregister() error {
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return DefaultServer.Deregister()
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}
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// Blocking run starts the default server and waits for a kill
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// signal before exiting. Also registers/deregisters the server
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func Run() error {
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if err := Start(); err != nil {
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return err
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}
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if err := DefaultServer.Register(); err != nil {
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return err
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}
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ch := make(chan os.Signal, 1)
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signal.Notify(ch, syscall.SIGTERM, syscall.SIGINT, syscall.SIGKILL)
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log.Infof("Received signal %s", <-ch)
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if err := DefaultServer.Deregister(); err != nil {
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return err
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}
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return Stop()
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}
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// Starts the default server
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func Start() error {
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config := DefaultServer.Config()
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log.Infof("Starting server %s id %s", config.Name(), config.Id())
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return DefaultServer.Start()
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}
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// Stops the default server
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func Stop() error {
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log.Infof("Stopping server")
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return DefaultServer.Stop()
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}
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