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