/
server.go
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/
server.go
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// Copyright 2020 Asim Aslam
//
// 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
//
// https://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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Original source: github.com/micro/go-micro/v3/server/server.go
package server
import (
"context"
"time"
"github.com/google/uuid"
"github.com/micro/micro/v3/service/registry"
"github.com/micro/micro/v3/util/codec"
)
// DefaultServer for the service
var DefaultServer Server
// Server is a simple micro server abstraction
type Server interface {
// Initialise options
Init(...Option) error
// Retrieve the options
Options() Options
// Register a handler
Handle(Handler) error
// Create a new handler
NewHandler(interface{}, ...HandlerOption) Handler
// Create a new subscriber
NewSubscriber(string, interface{}, ...SubscriberOption) Subscriber
// Register a subscriber
Subscribe(Subscriber) error
// Start the server
Start() error
// Stop the server
Stop() error
// Server implementation
String() string
}
// Router handle serving messages
type Router interface {
// ProcessMessage processes a message
ProcessMessage(context.Context, Message) error
// ServeRequest processes a request to completion
ServeRequest(context.Context, Request, Response) error
}
// Message is an async message interface
type Message interface {
// Topic of the message
Topic() string
// The decoded payload value
Payload() interface{}
// The content type of the payload
ContentType() string
// The raw headers of the message
Header() map[string]string
// The raw body of the message
Body() []byte
// Codec used to decode the message
Codec() codec.Reader
}
// Request is a synchronous request interface
type Request interface {
// Service name requested
Service() string
// The action requested
Method() string
// Endpoint name requested
Endpoint() string
// Content type provided
ContentType() string
// Header of the request
Header() map[string]string
// Body is the initial decoded value
Body() interface{}
// Read the undecoded request body
Read() ([]byte, error)
// The encoded message stream
Codec() codec.Reader
// Indicates whether its a stream
Stream() bool
}
// Response is the response writer for unencoded messages
type Response interface {
// Encoded writer
Codec() codec.Writer
// Write the header
WriteHeader(map[string]string)
// write a response directly to the client
Write([]byte) error
}
// 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 endpoints 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 endpoints. It mirrors
// the handler in its behaviour.
type Subscriber interface {
Topic() string
Subscriber() interface{}
Endpoints() []*registry.Endpoint
Options() SubscriberOptions
}
type Option func(*Options)
var (
DefaultAddress = ":0"
DefaultName = "go.micro.server"
DefaultVersion = "latest"
DefaultId = uuid.New().String()
DefaultRegisterCheck = func(context.Context) error { return nil }
DefaultRegisterInterval = time.Second * 30
DefaultRegisterTTL = time.Second * 90
)
// Register a handler
func Handle(hdlr Handler) error {
return DefaultServer.Handle(hdlr)
}
// Create a new handler
func NewHandler(hdlr interface{}) Handler {
return DefaultServer.NewHandler(hdlr)
}
// Create a new subscriber
func NewSubscriber(topic string, hdlr interface{}) Subscriber {
return DefaultServer.NewSubscriber(topic, hdlr)
}
// Register a subscriber
func Subscribe(sub Subscriber) error {
return DefaultServer.Subscribe(sub)
}