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server.go
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server.go
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// Package server is an interface for a micro server
package server
import (
"context"
"time"
"github.com/google/uuid"
"github.com/unistack-org/micro/v3/codec"
"github.com/unistack-org/micro/v3/metadata"
"github.com/unistack-org/micro/v3/register"
)
var (
// DefaultServer default server
DefaultServer Server = NewServer()
)
var (
// DefaultAddress will be used if no address passed
DefaultAddress = ":0"
// DefaultName will be used if no name passed
DefaultName = "server"
// DefaultVersion will be used if no version passed
DefaultVersion = "latest"
// DefaultId will be used if no id passed
DefaultId = uuid.New().String()
// DefaultRegisterCheck holds func that run before register server
DefaultRegisterCheck = func(context.Context) error { return nil }
// DefaultRegisterInterval holds interval for register
DefaultRegisterInterval = time.Second * 30
// DefaultRegisterTTL holds register record ttl, must be multiple of DefaultRegisterInterval
DefaultRegisterTTL = time.Second * 90
// DefaultNamespace will be used if no namespace passed
DefaultNamespace = "micro"
// DefaultMaxMsgSize holds default max msg ssize
DefaultMaxMsgSize = 1024 * 1024 * 4 // 4Mb
// DefaultMaxMsgRecvSize holds default max recv size
DefaultMaxMsgRecvSize = 1024 * 1024 * 4 // 4Mb
// DefaultMaxMsgSendSize holds default max send size
DefaultMaxMsgSendSize = 1024 * 1024 * 4 // 4Mb
)
// Server is a simple micro server abstraction
type Server interface {
// Name returns server name
Name() string
// Initialise options
Init(...Option) error
// Retrieve the options
Options() Options
// Register a handler
Handle(h Handler) error
// Create a new handler
NewHandler(h interface{}, opts ...HandlerOption) Handler
// Create a new subscriber
NewSubscriber(topic string, h interface{}, opts ...SubscriberOption) Subscriber
// Register a subscriber
Subscribe(s 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(ctx context.Context, msg Message) error
// ServeRequest processes a request to completion
ServeRequest(ctx context.Context, req Request, rsp 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() metadata.Metadata
// The raw body of the message
Body() []byte
// Codec used to decode the message
Codec() codec.Codec
}
// 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() metadata.Metadata
// Body is the initial decoded value
Body() interface{}
// Read the undecoded request body
Read() ([]byte, error)
// The encoded message stream
Codec() codec.Codec
// Indicates whether its a stream
Stream() bool
}
// Response is the response writer for unencoded messages
type Response interface {
// Encoded writer
Codec() codec.Codec
// Write the header
WriteHeader(md metadata.Metadata)
// 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(msg interface{}) error
Recv(msg 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() []*register.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() []*register.Endpoint
Options() SubscriberOptions
}