micro/broker/broker.go
Vasiliy Tolstov 14c97d59c1 many improvements with options and noop stuff
* add many options helpers
* fix noop client to allow publish messages to topic in broker
* fix noop server to allow registering in registry
* fix noop server to allow subscribe to topic in broker
* fix new service initialization

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
2020-10-16 09:38:57 +03:00

46 lines
1.1 KiB
Go

// Package broker is an interface used for asynchronous messaging
package broker
import "context"
var (
DefaultBroker Broker = &NoopBroker{opts: NewOptions()}
)
// Broker is an interface used for asynchronous messaging.
type Broker interface {
Init(...Option) error
Options() Options
Address() string
Connect(context.Context) error
Disconnect(context.Context) error
Publish(context.Context, string, *Message, ...PublishOption) error
Subscribe(context.Context, string, Handler, ...SubscribeOption) (Subscriber, error)
String() string
}
// Handler is used to process messages via a subscription of a topic.
type Handler func(Event) error
// Event is given to a subscription handler for processing
type Event interface {
Topic() string
Message() *Message
Ack() error
Error() error
}
// Message is used to transfer data
type Message struct {
Header map[string]string
Body []byte
Error error
}
// Subscriber is a convenience return type for the Subscribe method
type Subscriber interface {
Options() SubscribeOptions
Topic() string
Unsubscribe(context.Context) error
}