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wss.go
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wss.go
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package gotiktoklive
import (
"context"
"encoding/hex"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"time"
pb "github.com/ryusuke410/gotiktoklive/proto"
"github.com/gobwas/ws"
"github.com/gobwas/ws/wsutil"
"golang.org/x/net/proxy"
"google.golang.org/protobuf/proto"
)
func (l *Live) connect(addr string, params map[string]string) error {
u, err := url.Parse("https://tiktok.com/")
if err != nil {
return nil
}
// Take the cookies from the HTTP client cookie jar and pass them as a GET parameter.
cookies := l.t.c.Jar.Cookies(u)
headers := http.Header{}
var s string
for _, cookie := range cookies {
if s == "" {
s = cookie.String()
} else {
s += "; " + cookie.String()
}
}
if len(cookies) > 0 {
headers.Set("Cookie", s)
}
vs := url.Values{}
for key, value := range defaultGETParams {
vs.Add(key, value)
}
for key, value := range params {
vs.Add(key, value)
}
vs.Add("room_id", l.ID)
wsURL := fmt.Sprintf("%s?%s", addr, vs.Encode())
// Read proxies from HTTP env variables, HTTPS takes precedent
var proxyURI *url.URL
envVars := []string{"HTTP_PROXY", "HTTPS_PROXY"}
for _, envVar := range envVars {
if httpProxy := os.Getenv(envVar); httpProxy != "" {
uri, err := url.Parse(httpProxy)
if err != nil {
l.t.warnHandler(fmt.Errorf("Failed to parse %s url: %w", envVar, err))
} else {
proxyURI = uri
}
}
}
// If proxy manually defined, use that
if l.t.proxy != nil {
proxyURI = l.t.proxy
}
// Default proxy net dial
proxyNetDial := proxy.FromEnvironment()
// If custom URI is defined, genereate proxy net dial from that
if proxyURI != nil {
dial, err := proxy.FromURL(proxyURI, Direct)
if err != nil {
l.t.warnHandler(fmt.Errorf("Failed to configure proxy dialer: %w", err))
} else {
proxyNetDial = dial
}
}
dialer := ws.Dialer{
Header: ws.HandshakeHeaderHTTP(headers),
NetDial: func(ctx context.Context, a, b string) (net.Conn, error) {
return proxyNetDial.Dial(a, b)
},
// NetDial: proxy.Dial,
Protocols: []string{"echo-protocol"},
}
conn, _, _, err := dialer.Dial(context.Background(), wsURL)
if err != nil {
return fmt.Errorf("Failed to connect: %w", err)
}
l.wss = conn
return nil
}
func (l *Live) readSocket() {
defer l.wss.Close()
defer l.t.wg.Done()
want := ws.OpBinary
s := ws.StateClientSide
controlHandler := wsutil.ControlFrameHandler(l.wss, s)
rd := wsutil.Reader{
Source: l.wss,
State: s,
CheckUTF8: true,
SkipHeaderCheck: false,
OnIntermediate: controlHandler,
}
for {
hdr, err := rd.NextFrame()
if err != nil {
l.t.warnHandler(fmt.Errorf("Failed to read websocket message, attempting to reconnect: %w", err))
l.wss.Close()
if !l.reconnectWebsocket() {
return
}
}
// If msg is ping or close
if hdr.OpCode.IsControl() {
if err := controlHandler(hdr, &rd); err != nil {
l.t.errHandler(fmt.Errorf("websocket control handler failed: %w", err))
}
continue
}
// Reopen connection if it was closed
if hdr.OpCode == ws.OpClose {
l.t.warnHandler("Websocket connection was closed by server, attempting to reconnect...")
if !l.reconnectWebsocket() {
return
}
}
// Wrong OpCode
if hdr.OpCode&want == 0 {
if err := rd.Discard(); err != nil {
l.t.errHandler(err)
}
continue
}
// Read message
msgBytes, err := ioutil.ReadAll(&rd)
if err != nil {
l.t.errHandler(fmt.Errorf("Failed to read websocket message: %w", err))
}
if err := l.parseWssMsg(msgBytes); err != nil {
l.t.errHandler(fmt.Errorf("Failed to parse websocket message: %w", err))
}
// Gracefully shutdown
select {
case <-l.done():
return
case <-l.t.done():
l.t.infoHandler("Close websocket, global context done")
return
default:
}
}
}
func (l *Live) reconnectWebsocket() bool {
time.Sleep(3 * time.Second)
connected, err := l.tryConnectionUpgrade()
if err != nil {
l.t.warnHandler(fmt.Errorf("Failed to re-open websocket connection: %w", err))
} else {
l.t.infoHandler("Reconnected to websocket successfully")
}
if !connected {
l.t.wg.Add(1)
go l.startPolling()
}
return connected
}
func (l *Live) parseWssMsg(wssMsg []byte) error {
var rsp pb.WebcastWebsocketMessage
if err := proto.Unmarshal(wssMsg, &rsp); err != nil {
return fmt.Errorf("Failed to unmarshal proto WebcastWebsocketMessage: %w", err)
}
if rsp.Type == "msg" {
var response pb.WebcastResponse
if err := proto.Unmarshal(rsp.Binary, &response); err != nil {
return fmt.Errorf("Failed to unmarshal proto WebcastResponse: %w", err)
}
if err := l.sendAck(rsp.Id); err != nil {
return fmt.Errorf("Failed to send websocket ack msg: %w", err)
}
l.cursor = response.Cursor
if l.t.Debug {
l.t.debugHandler(fmt.Sprintf("Got %d messages, %s", len(response.Messages), response.Cursor))
}
for _, rawMsg := range response.Messages {
msg, err := parseMsg(rawMsg, l.t.warnHandler)
if err != nil {
return fmt.Errorf("Failed to parse response message: %w", err)
}
if msg != nil {
// If channel is full, discard the first message
if len(l.Events) == l.chanSize {
<-l.Events
}
l.Events <- msg
}
// If livestream has ended
if m, ok := msg.(ControlEvent); ok && m.Action == 3 {
go func() {
select {
case <-time.After(10 * time.Second):
l.close()
}
}()
}
}
return nil
}
if l.t.Debug {
l.t.debugHandler(fmt.Sprintf("Message type unknown, %s : '%s'", rsp.Type, string(rsp.Binary)))
}
return nil
}
func (l *Live) sendPing() {
defer l.t.wg.Done()
b, err := hex.DecodeString("3A026862")
if err != nil {
l.t.errHandler(err)
}
t := time.NewTicker(10000 * time.Millisecond)
defer t.Stop()
for {
select {
case <-l.done():
return
case <-l.t.done():
return
case <-t.C:
if err := wsutil.WriteClientBinary(l.wss, b); err != nil {
l.t.errHandler(fmt.Errorf("Failed to send ping: %w", err))
}
}
}
}
func (l *Live) sendAck(id uint64) error {
msg := pb.WebcastWebsocketAck{
Id: id,
Type: "ack",
}
b, err := proto.Marshal(&msg)
if err != nil {
return err
}
if err := wsutil.WriteClientBinary(l.wss, b); err != nil {
return err
}
return nil
}
func (l *Live) tryConnectionUpgrade() (bool, error) {
if l.wsURL != "" && l.wsParams != nil {
err := l.connect(l.wsURL, l.wsParams)
if err != nil {
return false, fmt.Errorf("Connection upgrade failed: %w", err)
}
if l.t.Debug {
l.t.debugHandler("Connected to websocket")
}
l.t.wg.Add(2)
go l.readSocket()
go l.sendPing()
l.t.infoHandler("Connected to websocket")
return true, nil
}
return false, nil
}