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|
package recording
import (
"context"
"encoding/base64"
"encoding/json"
errs "github.com/keuin/slbr/bilibili/errors"
"github.com/keuin/slbr/danmaku"
"github.com/keuin/slbr/danmaku/dmmsg"
"github.com/keuin/slbr/danmaku/dmpkg"
"github.com/keuin/slbr/logging"
"time"
)
type liveCommand string
const (
CommandLiveStart = "LIVE"
CommandStreamPreparing = "PREPARING"
)
type liveInfo struct {
Command liveCommand `json:"cmd"`
Data map[string]interface{} `json:"data"`
}
const (
heartBeatInterval = 30 * time.Second
)
// watch monitors live room status by subscribing messages from Bilibili danmaku server,
// which talks to the client via a WebSocket or TCP connection.
// In our implementation, we use WebSocket over SSL/TLS.
// This function will return after the live is started,
// since one connection cannot receive more than one live start event.
// Error types:
// - UnrecoverableError
// - RecoverableError
// - context.Cancelled
func watch(
ctx context.Context,
t TaskConfig,
url string,
authKey string,
liveStatusChecker func() (bool, error),
logger logging.Logger,
) error {
var err error
dm := danmaku.NewDanmakuClient()
// connect to danmaku server for live online/offline notifications
err = dm.Connect(ctx, url)
if err != nil {
return errs.NewError(errs.DanmakuServerConnection, err)
}
defer func() {
// this operation may be time-consuming, so run in another goroutine
go func() {
_ = dm.Disconnect()
}()
}()
// the danmaku server requires an auth token and room id when connected
logger.Info("ws connected. Authenticating...")
err = dm.Authenticate(t.RoomId, authKey)
if err != nil {
return errs.NewError(errs.InvalidAuthProtocol, err)
}
// the danmaku server requires heartbeat messages every 30 seconds
heartbeat := func() error {
logger.Debug("Sending heartbeat...")
err := dm.Heartbeat()
if err == nil {
logger.Info("Heartbeat sent OK.")
} else {
logger.Error("Failed to send heartbeat: %v", err)
}
return err
}
// send initial heartbeat immediately
err = heartbeat()
if err != nil {
return errs.NewError(errs.Heartbeat, err)
}
// create heartbeat timer
heartBeatTimer := time.NewTicker(heartBeatInterval)
defer func() { heartBeatTimer.Stop() }()
logger.Info("Checking initial live status...")
isLiving, err := AutoRetryWithConfig[bool](ctx, logger, &t, liveStatusChecker)
if err != nil {
return errs.NewError(errs.InitialLiveStatus, err)
}
if isLiving {
logger.Info("The live is already started. Start recording immediately.")
return nil
} else {
logger.Info("The live is not started yet. Waiting...")
}
hbCtx, hbCancel := context.WithCancel(ctx)
defer hbCancel()
go func() {
for {
select {
case <-heartBeatTimer.C:
err = heartbeat()
if err != nil {
logger.Error("heartbeat failed: %v", err)
}
case <-hbCtx.Done():
logger.Debug("Heartbeat loop is stopped.")
return
}
}
}()
for {
select {
case <-ctx.Done():
return ctx.Err()
default:
var msg dmpkg.DanmakuExchange
msg, err = dm.ReadExchange()
if err != nil {
return errs.NewError(errs.DanmakuExchangeRead, err)
}
// the exchange may be compressed
msg, err = msg.Inflate()
if err != nil {
return errs.NewError(errs.MessageDecompression, err)
}
switch msg.Operation {
case dmpkg.OpLayer7Data:
//logger.Printf("server message: op %v, body %v", msg.Operation, string(msg.Body))
var info liveInfo
err := json.Unmarshal(msg.Body, &info)
if err != nil {
logger.Error("Invalid JSON: \"%v\", exchange: %v", string(msg.Body), msg)
return errs.NewError(errs.JsonDecode, err)
}
switch info.Command {
case CommandLiveStart:
return nil
case CommandStreamPreparing:
break
default:
switch info.Command {
case "ENTRY_EFFECT":
fallthrough
case "ONLINE_RANK_V2":
fallthrough
case "ONLINE_RANK_COUNT":
fallthrough
case "STOP_LIVE_ROOM_LIST":
// useless message
fallthrough
case "HOT_RANK_CHANGED_V2":
// useless message
logger.Info("Ignore message: %v", info.Command)
case "WATCHED_CHANGE":
// number of watched people changed
obj, exists := info.Data["num"]
if !exists {
continue
}
viewersNum, ok := obj.(float64)
if !ok {
logger.Error("Cannot parse watched people number: %v", obj)
continue
}
logger.Info("The number of viewers (room: %v): %v", t.RoomId, viewersNum)
case "INTERACT_WORD":
var raw dmmsg.RawInteractWordMessage
err = json.Unmarshal(msg.Body, &raw)
if err != nil {
logger.Error("Cannot parse RawInteractWordMessage JSON: %v", err)
continue
}
logger.Info("Interact word message: user: %v medal: %v",
raw.Data.UserName, raw.Data.FansMedal.Name)
case "DANMU_MSG":
var raw dmmsg.RawDanMuMessage
err = json.Unmarshal(msg.Body, &raw)
if err != nil {
logger.Error("Cannot parse danmaku message as JSON: %v", err)
continue
}
dmm, err := dmmsg.ParseDanmakuMessage(raw)
if err != nil {
logger.Error("Cannot parse danmaku message JSON: %v, raw data (base64 encoded): %v",
err, base64.StdEncoding.EncodeToString(msg.Body))
continue
}
logger.Info("Danmaku: %v", dmm.String())
default:
logger.Info("Ignore unhandled server message %v %v %v",
info.Command, msg.Operation, string(msg.Body))
}
}
default:
logger.Info("Server message: %v", msg.String())
}
}
}
}
|
