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package hbwebsocketclientbase
import (
"fmt"
"github.com/gorilla/websocket"
"sync"
"time"
"wss-pool/internal/gzip"
"wss-pool/internal/model"
"wss-pool/internal/requestbuilder"
"wss-pool/logging/applogger"
"wss-pool/pkg/model/auth"
"wss-pool/pkg/model/base"
)
const (
websocketV2Path = "/ws/v2"
)
// It will be invoked after websocket v2 authentication response received
type AuthenticationV2ResponseHandler func(resp *auth.WebSocketV2AuthenticationResponse)
// The base class that responsible to get data from websocket authentication v2
type WebSocketV2ClientBase struct {
host string
conn *websocket.Conn
authenticationResponseHandler AuthenticationV2ResponseHandler
messageHandler MessageHandler
responseHandler ResponseHandler
stopReadChannel chan int
stopTickerChannel chan int
ticker *time.Ticker
lastReceivedTime time.Time
sendMutex *sync.Mutex
requestBuilder *requestbuilder.WebSocketV2RequestBuilder
}
// Initializer
func (p *WebSocketV2ClientBase) Init(accessKey string, secretKey string, host string) *WebSocketV2ClientBase {
p.host = host
p.stopReadChannel = make(chan int, 1)
p.stopTickerChannel = make(chan int, 1)
p.requestBuilder = new(requestbuilder.WebSocketV2RequestBuilder).Init(accessKey, secretKey, host, websocketV2Path)
p.sendMutex = &sync.Mutex{}
return p
}
// Set callback handler
func (p *WebSocketV2ClientBase) SetHandler(authHandler AuthenticationV2ResponseHandler, msgHandler MessageHandler, repHandler ResponseHandler) {
p.authenticationResponseHandler = authHandler
p.messageHandler = msgHandler
p.responseHandler = repHandler
}
// Connect to websocket websocketserver
// if autoConnect is true, then the connection can be re-connect if no data received after the pre-defined timeout
func (p *WebSocketV2ClientBase) Connect(autoConnect bool) {
// initialize last received time as now
p.lastReceivedTime = time.Now()
// connect to websocket
p.connectWebSocket()
// start ticker to manage connection
if autoConnect {
p.startTicker()
}
}
// Send data to websocket websocketserver
func (p *WebSocketV2ClientBase) Send(data string) {
if p.conn == nil {
applogger.Error("WebSocket sent error: no connection available")
return
}
p.sendMutex.Lock()
err := p.conn.WriteMessage(websocket.TextMessage, []byte(data))
p.sendMutex.Unlock()
if err != nil {
applogger.Error("WebSocket sent error: data=%s, error=%s", data, err)
}
}
// Close the connection to websocketserver
func (p *WebSocketV2ClientBase) Close() {
p.stopTicker()
p.disconnectWebSocket()
}
// connect to websocketserver
func (p *WebSocketV2ClientBase) connectWebSocket() {
var err error
url := fmt.Sprintf("wss://%s%s", p.host, websocketV2Path)
applogger.Debug("WebSocket connecting...")
p.conn, _, err = websocket.DefaultDialer.Dial(url, nil)
if err != nil {
applogger.Error("WebSocket connected error: %s", err)
return
}
applogger.Info("WebSocket connected")
// start loop to read and handle message
p.startReadLoop()
// send authentication if connect to websocket successfully
auth, err := p.requestBuilder.Build()
if err != nil {
applogger.Error("Signature generated error: %s", err)
return
}
p.Send(auth)
applogger.Info("WebSocket sent authentication")
}
// disconnect with websocketserver
func (p *WebSocketV2ClientBase) disconnectWebSocket() {
if p.conn == nil {
return
}
// start a new goroutine to send stop signal
go p.stopReadLoop()
applogger.Debug("WebSocket disconnecting...")
err := p.conn.Close()
if err != nil {
applogger.Error("WebSocket disconnect error: %s", err)
return
}
applogger.Info("WebSocket disconnected")
}
// initialize a ticker and start a goroutine tickerLoop()
func (p *WebSocketV2ClientBase) startTicker() {
p.ticker = time.NewTicker(TimerIntervalSecond * time.Second)
go p.tickerLoop()
}
// stop ticker and stop the goroutine
func (p *WebSocketV2ClientBase) stopTicker() {
p.ticker.Stop()
p.stopTickerChannel <- 1
}
// defines a for loop that will run based on ticker's frequency
// It checks the last data that received from websocketserver, if it is longer than the threshold,
// it will force disconnect websocketserver and connect again.
func (p *WebSocketV2ClientBase) tickerLoop() {
applogger.Debug("tickerLoop started")
for {
select {
// start a goroutine readLoop()
case <-p.stopTickerChannel:
applogger.Debug("tickerLoop stopped")
return
// Receive tick from tickChannel
case <-p.ticker.C:
elapsedSecond := time.Now().Sub(p.lastReceivedTime).Seconds()
applogger.Debug("WebSocket received data %f sec ago", elapsedSecond)
if elapsedSecond > ReconnectWaitSecond {
applogger.Info("WebSocket reconnect...")
p.disconnectWebSocket()
p.connectWebSocket()
}
}
}
}
// start a goroutine readLoop()
func (p *WebSocketV2ClientBase) startReadLoop() {
go p.readLoop()
}
// stop the goroutine readLoop()
func (p *WebSocketV2ClientBase) stopReadLoop() {
p.stopReadChannel <- 1
}
// defines a for loop to read data from websocketserver
// it will stop once it receives the signal from stopReadChannel
func (p *WebSocketV2ClientBase) readLoop() {
applogger.Debug("readLoop started")
for {
select {
// Receive data from stopChannel
case <-p.stopReadChannel:
applogger.Debug("readLoop stopped")
return
default:
if p.conn == nil {
applogger.Error("Read error: no connection available")
time.Sleep(TimerIntervalSecond * time.Second)
continue
}
msgType, buf, err := p.conn.ReadMessage()
if err != nil {
applogger.Error("Read error: %s", err)
time.Sleep(TimerIntervalSecond * time.Second)
continue
}
p.lastReceivedTime = time.Now()
// decompress gzip data if it is binary message
var message string
if msgType == websocket.BinaryMessage {
message, err = gzip.GZipDecompress(buf)
if err != nil {
applogger.Error("UnGZip data error: %s", err)
return
}
} else if msgType == websocket.TextMessage {
message = string(buf)
}
// Try to pass as PingV2Message
// If it is Ping then respond Pong
pingV2Msg := model.ParsePingV2Message(message)
if pingV2Msg.IsPing() {
applogger.Debug("Received Ping: %d", pingV2Msg.Data.Timestamp)
pongMsg := fmt.Sprintf("{\"action\": \"pong\", \"data\": { \"ts\": %d } }", pingV2Msg.Data.Timestamp)
p.Send(pongMsg)
applogger.Debug("Respond Pong: %d", pingV2Msg.Data.Timestamp)
} else {
// Try to pass as websocket v2 authentication response
// If it is then invoke authentication handler
wsV2Resp := base.ParseWSV2Resp(message)
if wsV2Resp != nil {
switch wsV2Resp.Action {
case "req":
authResp := auth.ParseWSV2AuthResp(message)
if authResp != nil && p.authenticationResponseHandler != nil {
p.authenticationResponseHandler(authResp)
}
case "sub", "push":
{
result, err := p.messageHandler(message)
if err != nil {
applogger.Error("Handle message error: %s", err)
continue
}
if p.responseHandler != nil {
p.responseHandler(result)
}
}
}
}
}
}
}
}