Vasiliy Tolstov
ffa01de78f
* remove subscribe from server * remove publish from client * broker package refactoring Co-authored-by: vtolstov <vtolstov@users.noreply.github.com> Reviewed-on: #396 Co-authored-by: Vasiliy Tolstov <v.tolstov@unistack.org> Co-committed-by: Vasiliy Tolstov <v.tolstov@unistack.org>
92 lines
3.0 KiB
Go
92 lines
3.0 KiB
Go
// Package broker is an interface used for asynchronous messaging
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package broker
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import (
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"context"
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"errors"
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"time"
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"go.unistack.org/micro/v4/codec"
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"go.unistack.org/micro/v4/metadata"
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)
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// DefaultBroker default memory broker
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var DefaultBroker Broker = NewBroker()
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var (
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// ErrNotConnected returns when broker used but not connected yet
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ErrNotConnected = errors.New("broker not connected")
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// ErrDisconnected returns when broker disconnected
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ErrDisconnected = errors.New("broker disconnected")
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// ErrInvalidMessage returns when invalid Message passed
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ErrInvalidMessage = errors.New("invalid message")
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// ErrInvalidHandler returns when subscriber passed to Subscribe
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ErrInvalidHandler = errors.New("invalid handler")
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// DefaultGracefulTimeout
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DefaultGracefulTimeout = 5 * time.Second
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)
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// Broker is an interface used for asynchronous messaging.
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type Broker interface {
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// Name returns broker instance name
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Name() string
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// Init initilize broker
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Init(opts ...Option) error
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// Options returns broker options
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Options() Options
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// Address return configured address
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Address() string
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// Connect connects to broker
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Connect(ctx context.Context) error
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// Disconnect disconnect from broker
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Disconnect(ctx context.Context) error
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// NewMessage create new broker message to publish.
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NewMessage(ctx context.Context, hdr metadata.Metadata, body interface{}, opts ...PublishOption) (Message, error)
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// Publish message to broker topic
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Publish(ctx context.Context, topic string, messages ...Message) error
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// Subscribe subscribes to topic message via handler
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Subscribe(ctx context.Context, topic string, handler interface{}, opts ...SubscribeOption) (Subscriber, error)
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// String type of broker
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String() string
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// Live returns broker liveness
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Live() bool
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// Ready returns broker readiness
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Ready() bool
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// Health returns broker health
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Health() bool
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}
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type (
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FuncPublish func(ctx context.Context, topic string, messages ...Message) error
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HookPublish func(next FuncPublish) FuncPublish
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FuncSubscribe func(ctx context.Context, topic string, handler interface{}, opts ...SubscribeOption) (Subscriber, error)
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HookSubscribe func(next FuncSubscribe) FuncSubscribe
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)
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// Message is given to a subscription handler for processing
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type Message interface {
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// Context for the message.
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Context() context.Context
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// Topic returns message destination topic.
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Topic() string
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// Header returns message headers.
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Header() metadata.Metadata
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// Body returns broker message []byte slice
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Body() []byte
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// Unmarshal try to decode message body to dst.
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// This is helper method that uses codec.Unmarshal.
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Unmarshal(dst interface{}, opts ...codec.Option) error
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// Ack acknowledge message if supported.
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Ack() error
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}
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// Subscriber is a convenience return type for the Subscribe method
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type Subscriber interface {
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// Options returns subscriber options
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Options() SubscribeOptions
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// Topic returns topic for subscription
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Topic() string
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// Unsubscribe from topic
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Unsubscribe(ctx context.Context) error
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}
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