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monitor.go
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monitor.go
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package twitch
import (
"encoding/json"
"fmt"
"github.com/asaskevich/EventBus"
"github.com/gorilla/websocket"
"github.com/quan-to/slog"
"net/url"
"strings"
"time"
)
const twitchWssUrl = "wss://pubsub-edge.twitch.tv"
const (
eventBusMessageByNonceTopic = "twitchws:onMessageByNonce:%s"
eventBusResponseMessageTopic = "twitchws:onResponseMessage"
eventBusWebsocketEvents = "twitchws:onMessage"
eventBusWebsocketChannelEvents = "twitchws:onChannelMessage:%s"
)
var log = slog.Scope("TwitchMonitor")
type Monitor struct {
running bool
channelname string
conn *websocket.Conn
pingTimer *time.Ticker
done chan struct{}
events chan ChatEvent
ev EventBus.Bus
}
func MakeMonitor(channelName string) *Monitor {
return &Monitor{
events: make(chan ChatEvent, 16),
channelname: channelName,
ev: EventBus.New(),
}
}
func (m *Monitor) Stop() {
if m.done != nil {
close(m.done)
m.done = nil
}
if m.conn != nil {
_ = m.conn.Close()
}
if m.pingTimer != nil {
m.pingTimer.Stop()
}
_ = m.ev.Unsubscribe(eventBusWebsocketEvents, m.onEvent)
}
func (m *Monitor) parseMessage(data []byte) {
var ok bool
//log.Debug("Received Message: %s", string(data))
dataMsg := map[string]interface{}{}
err := json.Unmarshal(data, &dataMsg)
if err != nil {
log.Error("Error parsing message: %s\nData: %s", err, string(data))
return
}
twitchType := dataMsg["type"].(string)
switch twitchType {
case "PONG":
//log.Debug("RECEIVED PONG")
case "RECONNECT":
log.Debug("Received Reconnect")
// TODO
case "RESPONSE":
nonce := ""
if nonceI, ok := dataMsg["nonce"]; ok {
nonce = nonceI.(string)
}
if nonce != "" {
// If we have a nonce, publish in the messageByNonceTopic
m.ev.Publish(fmt.Sprintf(eventBusMessageByNonceTopic, nonce), dataMsg)
}
m.ev.Publish(eventBusResponseMessageTopic, dataMsg)
case "MESSAGE":
dataMsg, ok = dataMsg["data"].(map[string]interface{})
if !ok {
log.Error("Expected data field to be json")
return
}
m.parseTwitchMessage(dataMsg)
}
}
func (m *Monitor) parseTwitchMessage(data map[string]interface{}) {
if _, ok := data["topic"]; !ok {
log.Error("Expected topic on twitch message")
return
}
if _, ok := data["message"]; !ok {
log.Error("Expected message on twitch message")
return
}
topic := data["topic"].(string)
msg := data["message"].(string)
channelId, event := channelIdAndEventFromTopic(topic)
if event == "" {
log.Warn("Unknown event: %s", topic)
return
}
log.Debug("Received event %s for channel %s", event, channelId)
var twitchEvent ChatEvent
var err error
switch event {
case topicChannelBitsEventv2:
twitchEvent, err = makeBitsEvent(channelId, msg)
case topicChannelSubscribe:
twitchEvent, err = makeSubscribeEvent(channelId, msg)
case topicChannelPoints:
twitchEvent, err = makePointsEvent(channelId, msg)
default:
err = fmt.Errorf("unknown event: %s", event)
}
if err != nil {
log.Error("error parsing event %s: %s", event, err)
return
}
// Publish to main event bus
m.ev.Publish(eventBusWebsocketEvents, twitchEvent)
// Publish to channel event bus
m.ev.Publish(fmt.Sprintf(eventBusWebsocketChannelEvents, channelId), twitchEvent)
}
func (m *Monitor) sendPing() {
msg := map[string]string{
"type": "PING",
}
msgBytes, _ := json.Marshal(msg)
err := m.conn.WriteMessage(websocket.TextMessage, msgBytes)
if err != nil {
log.Error("Error sending PING: %s", err)
}
}
func (m *Monitor) register() {
token, err := GetAccessToken()
if err != nil {
log.Error("Error getting token: %s", err)
}
topicList := make([]string, 0)
topicList = append(topicList, topicChannelPoints+"."+m.channelname)
topicList = append(topicList, topicChannelSubscribe+"."+m.channelname)
topicList = append(topicList, topicChannelBitsEventv2+"."+m.channelname)
err = m.Register(topicList, token.AccessToken)
if err != nil {
log.Error("Error registering to topics: %s", err)
}
}
func (m *Monitor) loop() {
log.Debug("Starting Loop")
run := true
for run {
select {
case <-m.done:
log.Info("Received done. Closing connections")
run = false
case <-m.pingTimer.C:
//log.Debug("Sending PING")
m.sendPing()
}
}
log.Debug("Closing loop")
}
func (m *Monitor) messageLoop() {
log.Debug("Starting message loop")
for {
_, msg, err := m.conn.ReadMessage()
if err != nil && !strings.Contains(err.Error(), "timeout") {
log.Error("Error receiving message: %s", err)
if m.done != nil {
close(m.done)
m.done = nil
}
break
}
m.parseMessage(msg)
}
log.Debug("Closing message loop")
}
func (m *Monitor) onEvent(data ChatEvent) {
// Forward received websocket event to event channel
m.events <- data
}
func (m *Monitor) Start() error {
u, err := url.Parse(twitchWssUrl)
if err != nil {
return err
}
log.Info("Connecting to %s", u.String())
m.conn, _, err = websocket.DefaultDialer.Dial(u.String(), nil)
if err != nil {
log.Error("Error connecting: %s", err)
return err
}
m.pingTimer = time.NewTicker(time.Second * 5)
m.done = make(chan struct{})
m.ev.SubscribeAsync(eventBusWebsocketEvents, m.onEvent, false)
go m.loop()
go m.messageLoop()
m.register()
return nil
}
func (m *Monitor) Register(events []string, token string) error {
msgId, msg := makeMessage("LISTEN", map[string]interface{}{
"topics": events,
"auth_token": token,
})
data, _ := json.Marshal(msg)
err := m.conn.WriteMessage(websocket.TextMessage, data)
if err != nil {
return err
}
result, err := m.waitForResult(msgId, time.Second*5)
if err != nil { // Timeout
return err
}
if twerror, ok := result["error"]; ok && twerror != "" {
return fmt.Errorf("twitch error: %s", twerror)
}
// If no error provided by twitch, assume LISTEN OK
return nil
}
func (m *Monitor) EventChannel() chan ChatEvent {
return m.events
}
func (m *Monitor) waitForResult(msgId string, timeout time.Duration) (data map[string]interface{}, err error) {
// Create a buffered channel to receive the result
res := make(chan map[string]interface{}, 1)
// Create the callback async and once
m.ev.SubscribeOnceAsync(fmt.Sprintf(eventBusMessageByNonceTopic, msgId), func(data map[string]interface{}) {
res <- data
})
timeoutTimer := time.NewTimer(timeout)
defer timeoutTimer.Stop()
select {
case <-timeoutTimer.C:
// Timeout
return nil, fmt.Errorf("timeout")
case data = <-res:
// Got result
return data, nil
}
}