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@asim @vtolstov
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// Package micro is a pluggable framework for microservices
package micro
import (
"context"
"github.com/micro/go-micro/v2/client"
"github.com/micro/go-micro/v2/server"
)
type serviceKey struct{}
// Service is an interface that wraps the lower level libraries
// within go-micro. Its a convenience method for building
// and initialising services.
type Service interface {
// The service name
Name() string
// Init initialises options
Init(...Option)
// Options returns the current options
Options() Options
// Client is used to call services
Client() client.Client
// Server is for handling requests and events
Server() server.Server
// Run the service
Run() error
// The service implementation
String() string
}
// Function is a one time executing Service
type Function interface {
// Inherits Service interface
Service
// Done signals to complete execution
Done() error
// Handle registers an RPC handler
Handle(v interface{}) error
// Subscribe registers a subscriber
Subscribe(topic string, v interface{}) error
}
/*
// Type Event is a future type for acting on asynchronous events
type Event interface {
// Publish publishes a message to the event topic
Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error
// Subscribe to the event
Subscribe(ctx context.Context, v in
}
// Resource is a future type for defining dependencies
type Resource interface {
// Name of the resource
Name() string
// Type of resource
Type() string
// Method of creation
Create() error
}
*/
// Event is used to publish messages to a topic
type Event interface {
// Publish publishes a message to the event topic
Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error
}
// Type alias to satisfy the deprecation
type Publisher = Event
type Option func(*Options)
var (
HeaderPrefix = "Micro-"
)
// NewService creates and returns a new Service based on the packages within.
func NewService(opts ...Option) Service {
return newService(opts...)
}
// FromContext retrieves a Service from the Context.
func FromContext(ctx context.Context) (Service, bool) {
s, ok := ctx.Value(serviceKey{}).(Service)
return s, ok
}
// NewContext returns a new Context with the Service embedded within it.
func NewContext(ctx context.Context, s Service) context.Context {
return context.WithValue(ctx, serviceKey{}, s)
}
// NewFunction returns a new Function for a one time executing Service
func NewFunction(opts ...Option) Function {
return newFunction(opts...)
}
// NewEvent creates a new event publisher
func NewEvent(topic string, c client.Client) Event {
if c == nil {
c = client.NewClient()
}
return &event{c, topic}
}
// Deprecated: NewPublisher returns a new Publisher
func NewPublisher(topic string, c client.Client) Event {
return NewEvent(topic, c)
}
// RegisterHandler is syntactic sugar for registering a handler
func RegisterHandler(s server.Server, h interface{}, opts ...server.HandlerOption) error {
return s.Handle(s.NewHandler(h, opts...))
}
// RegisterSubscriber is syntactic sugar for registering a subscriber
func RegisterSubscriber(topic string, s server.Server, h interface{}, opts ...server.SubscriberOption) error {
return s.Subscribe(s.NewSubscriber(topic, h, opts...))
}
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