mirror of https://github.com/go-redis/redis.git
108 lines
1.9 KiB
Go
108 lines
1.9 KiB
Go
package redis
|
|
|
|
import (
|
|
"fmt"
|
|
)
|
|
|
|
type PubSubClient struct {
|
|
*Client
|
|
isSubscribed bool
|
|
ch chan *Message
|
|
}
|
|
|
|
func NewPubSubClient(connect connectFunc, disconnect disconnectFunc) *PubSubClient {
|
|
c := &PubSubClient{
|
|
Client: NewClient(connect, disconnect),
|
|
ch: make(chan *Message),
|
|
}
|
|
return c
|
|
}
|
|
|
|
type Message struct {
|
|
Name, Channel, Message string
|
|
Number int64
|
|
|
|
Err error
|
|
}
|
|
|
|
func (c *PubSubClient) consumeMessages() {
|
|
req := NewMultiBulkReq()
|
|
|
|
for {
|
|
// Replies can arrive in batches.
|
|
// Read whole reply and parse messages one by one.
|
|
|
|
rd, err := c.readerPool.Get()
|
|
if err != nil {
|
|
msg := &Message{}
|
|
msg.Err = err
|
|
c.ch <- msg
|
|
return
|
|
}
|
|
defer c.readerPool.Add(rd)
|
|
|
|
err = c.ReadReply(rd)
|
|
if err != nil {
|
|
msg := &Message{}
|
|
msg.Err = err
|
|
c.ch <- msg
|
|
return
|
|
}
|
|
|
|
for {
|
|
msg := &Message{}
|
|
|
|
replyI, err := req.ParseReply(rd)
|
|
if err != nil {
|
|
msg.Err = err
|
|
c.ch <- msg
|
|
break
|
|
}
|
|
reply := replyI.([]interface{})
|
|
|
|
msgName := reply[0].(string)
|
|
switch msgName {
|
|
case "subscribe", "unsubscribe":
|
|
msg.Name = msgName
|
|
msg.Channel = reply[1].(string)
|
|
msg.Number = reply[2].(int64)
|
|
case "message":
|
|
msg.Name = msgName
|
|
msg.Channel = reply[1].(string)
|
|
msg.Message = reply[2].(string)
|
|
default:
|
|
msg.Err = fmt.Errorf("Unsupported message name: %q.", msgName)
|
|
}
|
|
c.ch <- msg
|
|
|
|
if !rd.HasUnread() {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (c *PubSubClient) Subscribe(channels ...string) (chan *Message, error) {
|
|
args := append([]string{"SUBSCRIBE"}, channels...)
|
|
req := NewMultiBulkReq(args...)
|
|
|
|
if err := c.WriteReq(req.Req()); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
c.mtx.Lock()
|
|
if !c.isSubscribed {
|
|
c.isSubscribed = true
|
|
go c.consumeMessages()
|
|
}
|
|
c.mtx.Unlock()
|
|
|
|
return c.ch, nil
|
|
}
|
|
|
|
func (c *PubSubClient) Unsubscribe(channels ...string) error {
|
|
args := append([]string{"UNSUBSCRIBE"}, channels...)
|
|
req := NewMultiBulkReq(args...)
|
|
return c.WriteReq(req.Req())
|
|
}
|