Now vendored, with Bolt v1.2.0

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vendor/github.com/garyburd/redigo/redis/pubsub.go

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+// Copyright 2012 Gary Burd
+//
+// Licensed under the Apache License, Version 2.0 (the "License"): you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations
+// under the License.
+
+package redis
+
+import "errors"
+
+// Subscription represents a subscribe or unsubscribe notification.
+type Subscription struct {
+
+	// Kind is "subscribe", "unsubscribe", "psubscribe" or "punsubscribe"
+	Kind string
+
+	// The channel that was changed.
+	Channel string
+
+	// The current number of subscriptions for connection.
+	Count int
+}
+
+// Message represents a message notification.
+type Message struct {
+
+	// The originating channel.
+	Channel string
+
+	// The message data.
+	Data []byte
+}
+
+// PMessage represents a pmessage notification.
+type PMessage struct {
+
+	// The matched pattern.
+	Pattern string
+
+	// The originating channel.
+	Channel string
+
+	// The message data.
+	Data []byte
+}
+
+// Pong represents a pubsub pong notification.
+type Pong struct {
+	Data string
+}
+
+// PubSubConn wraps a Conn with convenience methods for subscribers.
+type PubSubConn struct {
+	Conn Conn
+}
+
+// Close closes the connection.
+func (c PubSubConn) Close() error {
+	return c.Conn.Close()
+}
+
+// Subscribe subscribes the connection to the specified channels.
+func (c PubSubConn) Subscribe(channel ...interface{}) error {
+	c.Conn.Send("SUBSCRIBE", channel...)
+	return c.Conn.Flush()
+}
+
+// PSubscribe subscribes the connection to the given patterns.
+func (c PubSubConn) PSubscribe(channel ...interface{}) error {
+	c.Conn.Send("PSUBSCRIBE", channel...)
+	return c.Conn.Flush()
+}
+
+// Unsubscribe unsubscribes the connection from the given channels, or from all
+// of them if none is given.
+func (c PubSubConn) Unsubscribe(channel ...interface{}) error {
+	c.Conn.Send("UNSUBSCRIBE", channel...)
+	return c.Conn.Flush()
+}
+
+// PUnsubscribe unsubscribes the connection from the given patterns, or from all
+// of them if none is given.
+func (c PubSubConn) PUnsubscribe(channel ...interface{}) error {
+	c.Conn.Send("PUNSUBSCRIBE", channel...)
+	return c.Conn.Flush()
+}
+
+// Ping sends a PING to the server with the specified data.
+func (c PubSubConn) Ping(data string) error {
+	c.Conn.Send("PING", data)
+	return c.Conn.Flush()
+}
+
+// Receive returns a pushed message as a Subscription, Message, PMessage, Pong
+// or error. The return value is intended to be used directly in a type switch
+// as illustrated in the PubSubConn example.
+func (c PubSubConn) Receive() interface{} {
+	reply, err := Values(c.Conn.Receive())
+	if err != nil {
+		return err
+	}
+
+	var kind string
+	reply, err = Scan(reply, &kind)
+	if err != nil {
+		return err
+	}
+
+	switch kind {
+	case "message":
+		var m Message
+		if _, err := Scan(reply, &m.Channel, &m.Data); err != nil {
+			return err
+		}
+		return m
+	case "pmessage":
+		var pm PMessage
+		if _, err := Scan(reply, &pm.Pattern, &pm.Channel, &pm.Data); err != nil {
+			return err
+		}
+		return pm
+	case "subscribe", "psubscribe", "unsubscribe", "punsubscribe":
+		s := Subscription{Kind: kind}
+		if _, err := Scan(reply, &s.Channel, &s.Count); err != nil {
+			return err
+		}
+		return s
+	case "pong":
+		var p Pong
+		if _, err := Scan(reply, &p.Data); err != nil {
+			return err
+		}
+		return p
+	}
+	return errors.New("redigo: unknown pubsub notification")
+}