micro/micro.go

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// 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"
"github.com/micro/go-micro/server"
)
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type serviceKey struct{}
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// Service is an interface that wraps the lower level libraries
// within go-micro. Its a convenience method for building
// and initialising services.
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type Service interface {
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// The service name
Name() string
// 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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// 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
}
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/*
// 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
}
*/
// Publisher is uses to publish messages to a topic
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type Publisher 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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type Option func(*Options)
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 {
return newService(opts...)
}
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// FromContext retrieves a Service from the Context.
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func FromContext(ctx context.Context) (Service, bool) {
s, ok := ctx.Value(serviceKey{}).(Service)
return s, ok
}
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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 {
return context.WithValue(ctx, serviceKey{}, s)
}
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// NewFunction returns a new Function for a one time executing Service
func NewFunction(opts ...Option) Function {
return newFunction(opts...)
}
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// NewPublisher returns a new Publisher
func NewPublisher(topic string, c client.Client) Publisher {
if c == nil {
c = client.NewClient()
}
return &publisher{c, topic}
}
// 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 {
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return s.Subscribe(s.NewSubscriber(topic, h, opts...))
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}