func (logger *RedisLogger) Unsubscribe(psc *redis.PubSubConn, groups ...string) error {
var channels []interface{}
for _, group := range groups {
channels = append(channels, redisPubSubGroup+group)
}
return psc.Unsubscribe(channels...)
}
func slaveHandler(s *websocket.Conn, sessionID int, dbStore *Store, redisAddr string) {
xlog.Debugf("entering SlaveHandler")
c, err := redis.Dial("tcp", redisAddr)
if err != nil {
xlog.Errorf("redis.Dial failed: %v", err)
return
}
defer c.Close()
psc := redis.PubSubConn{Conn: c}
topic := fmt.Sprintf("session.%d", sessionID)
psc.Subscribe(topic)
defer psc.Unsubscribe(topic)
for {
switch v := psc.Receive().(type) {
case redis.Message:
StatCount("command for slave", 1)
var cmd Command
if err := json.Unmarshal(v.Data, &cmd); err != nil {
break
}
if err := websocket.JSON.Send(s, cmd); err != nil {
xlog.Errorf("slaveHandler: JSON.Send failed: %v", err)
return
}
if cmd.Cmd == "close" {
return
}
case redis.Subscription:
xlog.Debugf("mkay... redis.Subscription received: %#v", v)
}
}
}
// GetTaskResult fetchs task result for the specified taskID
func (b *Broker) GetTaskResult(taskID string) <-chan *broker.Message {
msg := make(chan *broker.Message)
// fetch messages
log.Debug("Waiting for Task Result Messages: ", taskID)
conn := b.pool.Get()
psc := redis.PubSubConn{Conn: conn}
psc.Subscribe(taskID)
go func() {
for {
switch v := psc.Receive().(type) {
case redis.Message:
log.Info("message: ", string(v.Data))
m := &broker.Message{}
err := json.Unmarshal(v.Data, &m)
if err != nil {
log.Error("Failed to unmarshal message.")
} else {
log.Debug("Task Result message: ", string(m.Body))
msg <- m
}
psc.Unsubscribe()
conn.Close()
close(msg)
break
}
}
}()
log.Debug("Subscribed to Task Result")
return msg
}
func RedisUnSub(key string, psc redis.PubSubConn) error {
if err := psc.Unsubscribe(key); err != nil {
Log.Printf("psc.Unsubscribe(\"%s\") faild (%s)", key, err.Error())
return err
}
return nil
}
// Applications can receive pushed messages from one goroutine and manage subscriptions from another goroutine.
func ExamplePubSubConn() {
c, err := dial()
if err != nil {
panic(err)
}
defer c.Close()
var wg sync.WaitGroup
wg.Add(2)
psc := redis.PubSubConn{Conn: c}
// This goroutine receives and prints pushed notifications from the server.
// The goroutine exits when the connection is unsubscribed from all
// channels or there is an error.
go func() {
defer wg.Done()
for {
switch n := psc.Receive().(type) {
case redis.Message:
fmt.Printf("Message: %s %s\n", n.Channel, n.Data)
case redis.PMessage:
fmt.Printf("PMessage: %s %s %s\n", n.Pattern, n.Channel, n.Data)
case redis.Subscription:
fmt.Printf("Subscription: %s %s %d\n", n.Kind, n.Channel, n.Count)
if n.Count == 0 {
return
}
case error:
fmt.Printf("error: %v\n", n)
return
}
}
}()
// This goroutine manages subscriptions for the connection.
go func() {
defer wg.Done()
psc.Subscribe("example")
psc.PSubscribe("p*")
// The following function calls publish a message using another
// connection to the Redis server.
publish("example", "hello")
publish("example", "world")
publish("pexample", "foo")
publish("pexample", "bar")
// Unsubscribe from all connections. This will cause the receiving
// goroutine to exit.
psc.Unsubscribe()
psc.PUnsubscribe()
}()
wg.Wait()
// Output:
// Subscription: subscribe example 1
// Subscription: psubscribe p* 2
// Message: example hello
// Message: example world
// PMessage: p* pexample foo
// PMessage: p* pexample bar
// Subscription: unsubscribe example 1
// Subscription: punsubscribe p* 0
}
func testPublishChannel(t *testing.T, cfg map[string]interface{}) {
batches := 100
batchSize := 1000
total := batches & batchSize
db := 0
index := cfg["index"].(string)
if v, ok := cfg["db"]; ok {
db = v.(int)
}
conn, err := redis.Dial("tcp", getRedisAddr(), redis.DialDatabase(db))
if err != nil {
t.Fatalf("redis.Dial failed %v", err)
}
// delete old key if present
defer conn.Close()
conn.Do("DEL", index)
// subscribe to packetbeat channel
psc := redis.PubSubConn{conn}
if err := psc.Subscribe(index); err != nil {
t.Fatal(err)
}
defer psc.Unsubscribe(index)
// connect and publish events
var wg sync.WaitGroup
var pubErr error
out := newRedisTestingOutput(t, cfg)
wg.Add(1)
go func() {
defer wg.Done()
pubErr = sendTestEvents(out, batches, batchSize)
}()
// collect published events by subscription
var messages [][]byte
assert.NoError(t, conn.Err())
for conn.Err() == nil {
t.Logf("try collect message")
switch v := psc.Receive().(type) {
case redis.Message:
messages = append(messages, v.Data)
case error:
t.Error(v)
default:
t.Logf("received: %#v", v)
}
if len(messages) == total {
break
}
}
wg.Wait()
// validate
assert.NoError(t, pubErr)
assert.Equal(t, total, len(messages))
for i, raw := range messages {
evt := struct{ Message int }{}
err = json.Unmarshal(raw, &evt)
assert.NoError(t, err)
assert.Equal(t, i+1, evt.Message)
}
}
func TestPubSub(t *testing.T) {
conn := NewConn()
conn.ReceiveWait = true
redisChannel := "subchannel"
conn.Command("SUBSCRIBE", redisChannel).Expect([]interface{}{
[]byte("subscribe"),
[]byte(redisChannel),
[]byte("1"),
})
messages := [][]byte{
[]byte("value1"),
[]byte("value2"),
[]byte("value3"),
[]byte("finished"),
}
for _, message := range messages {
conn.AddSubscriptionMessage([]interface{}{
[]byte("message"),
[]byte(redisChannel),
message,
})
}
//Check some values are correct
if len(conn.commands) != 1 {
t.Error("Initial subscription message not set correctly")
}
if len(conn.SubResponses) != 4 {
t.Error("PubSub messages not queued up corectly")
}
//Use the pub sub connection
nextMessage := func() {
conn.ReceiveNow <- true
}
go nextMessage() //Allow the subscribe message to come through
psc := redis.PubSubConn{Conn: conn}
psc.Subscribe(redisChannel)
defer psc.Unsubscribe()
//Receive the subscribe message
subResponse := psc.Receive()
switch smsg := subResponse.(type) {
case redis.Subscription:
if smsg.Kind != "subscribe" {
t.Error("Subscription ack kind is wrong")
}
if smsg.Channel != redisChannel {
t.Error("Subscription ack channel is wrong")
}
if smsg.Count != 1 {
t.Error("Subscription ack count is wrong")
}
default:
t.Error("Got wrong type back on initial subscription")
}
//Receive the other messages - control when they come
testResponse := make(chan []byte, 1)
go func() {
for {
switch msg := psc.Receive().(type) {
case redis.Message:
testResponse <- msg.Data
}
}
}()
for _, expMsg := range messages {
assertChannelEmpty(t, testResponse)
go nextMessage()
msg := <-testResponse
if !reflect.DeepEqual(msg, expMsg) {
t.Error("Expected message", string(expMsg), "got", string(msg))
}
assertChannelEmpty(t, testResponse)
}
}
func main() {
flag.Parse()
redisPool := redis.NewPool(func() (redis.Conn, error) {
c, err := redis.Dial("tcp", *redisAddress)
if err != nil {
return nil, err
}
return c, err
}, *maxConnections)
defer redisPool.Close()
/*
c, err := redis.Dial("tcp", ":6379")
if err != nil {
panic(err)
}
defer c.Close()
*/
var wg sync.WaitGroup
wg.Add(2)
// psc := redis.PubSubConn{Conn: c}
psc := redis.PubSubConn{Conn: redisPool.Get()}
// This goroutine receives and prints pushed notifications from the server.
// The goroutine exits when the connection is unsubscribed from all
// channels or there is an error.
go func() {
defer wg.Done()
for {
switch n := psc.Receive().(type) {
case redis.Message:
fmt.Printf("Message: %s %s\n", n.Channel, n.Data)
case redis.PMessage:
fmt.Printf("PMessage: %s %s %s\n", n.Pattern, n.Channel, n.Data)
case redis.Subscription:
fmt.Printf("Subscription: %s %s %d\n", n.Kind, n.Channel, n.Count)
if n.Count == 0 {
return
}
case error:
fmt.Printf("error: %v\n", n)
return
}
}
}()
// This goroutine manages subscriptions for the connection.
go func() {
defer wg.Done()
psc.Subscribe("example")
psc.PSubscribe("p*")
psc.PSubscribe("bigbluebutton:to-bbb-apps:system")
// The following function calls publish a message using another
// connection to the Redis server.
publish("example", "hello")
publish("example", "world")
publish("pexample", "foo")
publish("pexample", "bar")
// Unsubscribe from all connections. This will cause the receiving
// goroutine to exit.
psc.Unsubscribe()
//psc.PUnsubscribe()
}()
wg.Wait()
// Output:
// Subscription: subscribe example 1
// Subscription: psubscribe p* 2
// Message: example hello
// Message: example world
// PMessage: p* pexample foo
// PMessage: p* pexample bar
// Subscription: unsubscribe example 1
// Subscription: punsubscribe p* 0
}
func (this __red) Subscribe(messages ...interface{}) (notify chan interface{}, shutdown func(wait bool)) {
log.Println("SUBSCRIBE")
channels := []interface{}{}
channelsMap := map[string]interface{}{}
for _, message := range messages {
switch message := message.(type) {
default:
_ = message
panic("Unsupported message type")
}
}
conn := this.__.(redis.Conn)
psc := redis.PubSubConn{Conn: conn}
err := psc.Subscribe(channels...)
if err != nil {
panic(err)
}
notify = make(chan interface{}, 1024)
notifyInternal := make(chan interface{}, 1024)
closeInternal := make(chan error, 1)
go func() {
defer func() {
if rec := recover(); rec != nil {
log.Println("PANIC ! RECEIVER:", rec, __red_stack())
closeInternal <- errors.New(fmt.Sprint(rec))
} else {
log.Println("RECEIVER No more subscriptions")
closeInternal <- nil
}
}()
for {
switch n := psc.Receive().(type) {
case redis.Message:
if m, ok := channelsMap[n.Channel]; ok {
switch m := m.(type) {
default:
_ = m
panic("Unsupported message type")
}
} else {
// TODO
}
case redis.Subscription:
if n.Count == 0 {
return
}
}
}
}()
var doneWG sync.WaitGroup
doneWG.Add(1)
go func() {
defer func() {
defer doneWG.Done()
if rec := recover(); rec != nil {
log.Println("PANIC ! PINGER:", rec, __red_stack())
notify <- errors.New(fmt.Sprint(rec))
} else {
// TODO
log.Println("PUBSUB | CLOSED")
}
}()
Q:
for {
select {
case err := <-closeInternal:
notify <- err
break Q
case <-notifyInternal:
// notify <- msg
case <-time.After(__red_ops.PingPeriod):
err := psc.Ping("")
if err != nil {
notify <- err
break Q
}
}
}
}()
shutdown = func(wait bool) {
err := psc.Unsubscribe()
if err != nil {
panic(err)
}
if wait {
doneWG.Wait()
}
}
return
}
