micro/server/server.go
2018-11-26 14:51:42 +00:00

201 lines
4.8 KiB
Go

// Package server is an interface for a micro server
package server
import (
"context"
"os"
"os/signal"
"syscall"
"github.com/google/uuid"
"github.com/micro/go-log"
"github.com/micro/go-micro/registry"
)
// Server is a simple micro server abstraction
type Server interface {
Options() Options
Init(...Option) error
Handle(Handler) error
NewHandler(interface{}, ...HandlerOption) Handler
NewSubscriber(string, interface{}, ...SubscriberOption) Subscriber
Subscribe(Subscriber) error
Register() error
Deregister() error
Start() error
Stop() error
String() string
}
// Message is an async message interface
type Message interface {
Topic() string
Payload() interface{}
ContentType() string
}
// Request is a synchronous request interface
type Request interface {
Service() string
Method() string
ContentType() string
Request() interface{}
// indicates whether the request will be streamed
Stream() bool
}
// Stream represents a stream established with a client.
// A stream can be bidirectional which is indicated by the request.
// The last error will be left in Error().
// EOF indicates end of the stream.
type Stream interface {
Context() context.Context
Request() Request
Send(interface{}) error
Recv(interface{}) error
Error() error
Close() error
}
// Handler interface represents a request handler. It's generated
// by passing any type of public concrete object with methods into server.NewHandler.
// Most will pass in a struct.
//
// Example:
//
// type Greeter struct {}
//
// func (g *Greeter) Hello(context, request, response) error {
// return nil
// }
//
type Handler interface {
Name() string
Handler() interface{}
Endpoints() []*registry.Endpoint
Options() HandlerOptions
}
// Subscriber interface represents a subscription to a given topic using
// a specific subscriber function or object with methods.
type Subscriber interface {
Topic() string
Subscriber() interface{}
Endpoints() []*registry.Endpoint
Options() SubscriberOptions
}
type Option func(*Options)
type HandlerOption func(*HandlerOptions)
type SubscriberOption func(*SubscriberOptions)
var (
DefaultAddress = ":0"
DefaultName = "go-server"
DefaultVersion = "1.0.0"
DefaultId = uuid.New().String()
DefaultServer Server = newRpcServer()
)
// DefaultOptions returns config options for the default service
func DefaultOptions() Options {
return DefaultServer.Options()
}
// Init initialises the default server with options passed in
func Init(opt ...Option) {
if DefaultServer == nil {
DefaultServer = newRpcServer(opt...)
}
DefaultServer.Init(opt...)
}
// NewServer returns a new server with options passed in
func NewServer(opt ...Option) Server {
return newRpcServer(opt...)
}
// NewSubscriber creates a new subscriber interface with the given topic
// and handler using the default server
func NewSubscriber(topic string, h interface{}, opts ...SubscriberOption) Subscriber {
return DefaultServer.NewSubscriber(topic, h, opts...)
}
// NewHandler creates a new handler interface using the default server
// Handlers are required to be a public object with public
// methods. Call to a service method such as Foo.Bar expects
// the type:
//
// type Foo struct {}
// func (f *Foo) Bar(ctx, req, rsp) error {
// return nil
// }
//
func NewHandler(h interface{}, opts ...HandlerOption) Handler {
return DefaultServer.NewHandler(h, opts...)
}
// Handle registers a handler interface with the default server to
// handle inbound requests
func Handle(h Handler) error {
return DefaultServer.Handle(h)
}
// Subscribe registers a subscriber interface with the default server
// which subscribes to specified topic with the broker
func Subscribe(s Subscriber) error {
return DefaultServer.Subscribe(s)
}
// Register registers the default server with the discovery system
func Register() error {
return DefaultServer.Register()
}
// Deregister deregisters the default server from the discovery system
func Deregister() error {
return DefaultServer.Deregister()
}
// Run starts the default server and waits for a kill
// signal before exiting. Also registers/deregisters the server
func Run() error {
if err := Start(); err != nil {
return err
}
if err := DefaultServer.Register(); err != nil {
return err
}
ch := make(chan os.Signal, 1)
signal.Notify(ch, syscall.SIGTERM, syscall.SIGINT, syscall.SIGKILL)
log.Logf("Received signal %s", <-ch)
if err := DefaultServer.Deregister(); err != nil {
return err
}
return Stop()
}
// Start starts the default server
func Start() error {
config := DefaultServer.Options()
log.Logf("Starting server %s id %s", config.Name, config.Id)
return DefaultServer.Start()
}
// Stop stops the default server
func Stop() error {
log.Logf("Stopping server")
return DefaultServer.Stop()
}
// String returns name of Server implementation
func String() string {
return DefaultServer.String()
}