144 lines
3.6 KiB
Go
144 lines
3.6 KiB
Go
// Package server is an interface for a micro server
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package server
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import (
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"context"
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"time"
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"github.com/asim/go-micro/v3/codec"
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"github.com/asim/go-micro/v3/registry"
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"github.com/google/uuid"
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)
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// Server is a simple micro server abstraction
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type Server interface {
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// Initialise options
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Init(...Option) error
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// Retrieve the options
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Options() Options
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// Register a handler
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Handle(Handler) error
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// Create a new handler
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NewHandler(interface{}, ...HandlerOption) Handler
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// Create a new subscriber
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NewSubscriber(string, interface{}, ...SubscriberOption) Subscriber
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// Register a subscriber
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Subscribe(Subscriber) error
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// Start the server
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Start() error
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// Stop the server
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Stop() error
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// Server implementation
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String() string
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}
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// Router handle serving messages
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type Router interface {
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// ProcessMessage processes a message
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ProcessMessage(context.Context, Message) error
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// ServeRequest processes a request to completion
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ServeRequest(context.Context, Request, Response) error
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}
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// Message is an async message interface
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type Message interface {
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// Topic of the message
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Topic() string
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// The decoded payload value
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Payload() interface{}
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// The content type of the payload
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ContentType() string
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// The raw headers of the message
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Header() map[string]string
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// The raw body of the message
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Body() []byte
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// Codec used to decode the message
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Codec() codec.Reader
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}
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// Request is a synchronous request interface
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type Request interface {
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// Service name requested
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Service() string
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// The action requested
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Method() string
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// Endpoint name requested
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Endpoint() string
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// Content type provided
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ContentType() string
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// Header of the request
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Header() map[string]string
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// Body is the initial decoded value
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Body() interface{}
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// Read the undecoded request body
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Read() ([]byte, error)
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// The encoded message stream
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Codec() codec.Reader
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// Indicates whether its a stream
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Stream() bool
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}
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// Response is the response writer for unencoded messages
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type Response interface {
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// Encoded writer
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Codec() codec.Writer
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// Write the header
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WriteHeader(map[string]string)
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// write a response directly to the client
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Write([]byte) error
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}
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// Stream represents a stream established with a client.
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// A stream can be bidirectional which is indicated by the request.
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// The last error will be left in Error().
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// EOF indicates end of the stream.
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type Stream interface {
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Context() context.Context
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Request() Request
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Send(interface{}) error
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Recv(interface{}) error
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Error() error
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Close() error
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}
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// Handler interface represents a request handler. It's generated
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// by passing any type of public concrete object with endpoints into server.NewHandler.
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// Most will pass in a struct.
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//
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// Example:
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//
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// type Greeter struct {}
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//
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// func (g *Greeter) Hello(context, request, response) error {
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// return nil
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// }
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//
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type Handler interface {
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Name() string
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Handler() interface{}
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Endpoints() []*registry.Endpoint
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Options() HandlerOptions
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}
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// Subscriber interface represents a subscription to a given topic using
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// a specific subscriber function or object with endpoints. It mirrors
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// the handler in its behaviour.
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type Subscriber interface {
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Topic() string
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Subscriber() interface{}
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Endpoints() []*registry.Endpoint
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Options() SubscriberOptions
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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.micro.server"
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DefaultVersion = "latest"
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DefaultId = uuid.New().String()
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DefaultRegisterCheck = func(context.Context) error { return nil }
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DefaultRegisterInterval = time.Second * 30
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DefaultRegisterTTL = time.Second * 90
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)
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