mirror of https://github.com/go-redis/redis.git
120 lines
2.1 KiB
Go
120 lines
2.1 KiB
Go
package redis
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import (
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"fmt"
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"sync"
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)
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type PubSubClient struct {
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*Client
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ch chan *Message
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once sync.Once
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}
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func newPubSubClient(client *Client) (*PubSubClient, error) {
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pubSubConn, _, err := client.ConnPool.Get()
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if err != nil {
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return nil, err
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}
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client.ConnPool.Remove(pubSubConn)
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c := &PubSubClient{
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Client: &Client{
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ConnPool: NewOneConnPool(pubSubConn),
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},
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ch: make(chan *Message),
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}
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return c, nil
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}
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type Message struct {
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Name, Channel, Message string
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Number int64
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Err error
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}
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func (c *PubSubClient) consumeMessages() {
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conn, err := c.conn()
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if err != nil {
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panic(err)
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}
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req := NewMultiBulkReq()
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for {
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// Replies can arrive in batches.
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// Read whole reply and parse messages one by one.
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err := c.ReadReply(conn)
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if err != nil {
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msg := &Message{}
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msg.Err = err
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c.ch <- msg
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return
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}
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for {
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msg := &Message{}
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replyI, err := req.ParseReply(conn.Rd)
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if err != nil {
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msg.Err = err
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c.ch <- msg
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break
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}
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reply := replyI.([]interface{})
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msgName := reply[0].(string)
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switch msgName {
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case "subscribe", "unsubscribe":
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msg.Name = msgName
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msg.Channel = reply[1].(string)
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msg.Number = reply[2].(int64)
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case "message":
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msg.Name = msgName
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msg.Channel = reply[1].(string)
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msg.Message = reply[2].(string)
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default:
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msg.Err = fmt.Errorf("Unsupported message name: %q.", msgName)
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}
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c.ch <- msg
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if !conn.Rd.HasUnread() {
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break
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}
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}
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}
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}
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func (c *PubSubClient) Subscribe(channels ...string) (chan *Message, error) {
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args := append([]string{"SUBSCRIBE"}, channels...)
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req := NewMultiBulkReq(args...)
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conn, err := c.conn()
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if err != nil {
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return nil, err
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}
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if err := c.WriteReq(req.Req(), conn); err != nil {
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return nil, err
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}
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c.once.Do(func() {
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go c.consumeMessages()
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})
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return c.ch, nil
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}
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func (c *PubSubClient) Unsubscribe(channels ...string) error {
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args := append([]string{"UNSUBSCRIBE"}, channels...)
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req := NewMultiBulkReq(args...)
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conn, err := c.conn()
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if err != nil {
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return err
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}
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return c.WriteReq(req.Req(), conn)
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}
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