129 lines
3.2 KiB
Go
129 lines
3.2 KiB
Go
// 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
|
|
}
|
|
|
|
// 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()
|
|
}
|
|
|
|
// Receive returns a pushed message as a Subscription, Message, PMessage 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
|
|
}
|
|
return errors.New("redigo: unknown pubsub notification")
|
|
}
|