130 lines
2.6 KiB
Go
130 lines
2.6 KiB
Go
package redis
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import (
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"encoding/json"
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"fmt"
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"sync"
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logging "git.loafle.net/commons/logging-go"
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"git.loafle.net/overflow/gateway/subscribe"
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"github.com/gomodule/redigo/redis"
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)
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type Subscribers struct {
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Conn redis.Conn
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pubSubConn *redis.PubSubConn
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subscriptions map[string]chan *subscribe.Message
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stopChan chan struct{}
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stopWg sync.WaitGroup
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}
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func (s *Subscribers) Start() error {
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if s.stopChan != nil {
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return fmt.Errorf("Subscriber: already running. Stop it before starting it again")
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}
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if nil == s.Conn {
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return fmt.Errorf("Subscriber: Conn is nil")
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}
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if nil == s.subscriptions {
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s.subscriptions = make(map[string]chan *subscribe.Message)
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}
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s.pubSubConn = &redis.PubSubConn{Conn: s.Conn}
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s.stopChan = make(chan struct{})
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s.stopWg.Add(1)
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go s.handleSubscriber()
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return nil
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}
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func (s *Subscribers) Stop() error {
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if s.stopChan == nil {
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return fmt.Errorf("Subscriber: must be started before stopping it")
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}
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close(s.stopChan)
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s.stopWg.Wait()
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s.stopChan = nil
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return nil
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}
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func (s *Subscribers) Subscribe(channel string) (<-chan *subscribe.Message, error) {
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if _, ok := s.subscriptions[channel]; ok {
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return nil, subscribe.ChannelExistError{Channel: channel}
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}
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if err := s.pubSubConn.Subscribe(channel); nil != err {
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return nil, err
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}
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msgChan := make(chan *subscribe.Message)
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s.subscriptions[channel] = msgChan
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return msgChan, nil
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}
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func (s *Subscribers) Unsubscribe(channel string) error {
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msgChan, ok := s.subscriptions[channel]
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if !ok {
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return subscribe.ChannelIsNotExistError{Channel: channel}
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}
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delete(s.subscriptions, channel)
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close(msgChan)
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return s.pubSubConn.Unsubscribe(channel)
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}
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func (s *Subscribers) handleSubscriber() {
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var (
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receive interface{}
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)
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defer func() {
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if nil != s.subscriptions {
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for _, msgChan := range s.subscriptions {
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close(msgChan)
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}
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}
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if nil != s.pubSubConn {
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s.pubSubConn.Close()
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}
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s.stopWg.Done()
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}()
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receiveChan := make(chan interface{})
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for {
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go func() {
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receive = s.pubSubConn.Receive()
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receiveChan <- receive
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}()
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select {
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case msg := <-receiveChan:
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switch v := msg.(type) {
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case redis.Message:
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msgChan, ok := s.subscriptions[v.Channel]
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if !ok {
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logging.Logger().Warnf("Subscriber: Channel[%s] is not exist", v.Channel)
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break
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}
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message := &subscribe.Message{}
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if err := json.Unmarshal(v.Data, message); nil != err {
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logging.Logger().Errorf("Subscriber: Cannot unmarshal data[%s] of Channel[%s] %v", string(v.Data), v.Channel, err)
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break
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}
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msgChan <- message
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case redis.Subscription:
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case error:
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}
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case <-s.stopChan:
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return
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}
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}
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}
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