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connection.go
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connection.go
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package ws
import (
"encoding/json"
"net/http"
"time"
"github.com/byteball/odex-backend/types"
"github.com/byteball/odex-backend/utils"
"github.com/gorilla/websocket"
)
const (
writeWait = 60 * time.Second
pongWait = 60 * time.Second
pingPeriod = (pongWait * 9) / 10
)
var logger = NewWebsocketLogger()
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
// ConnectionEndpoint is the the handleFunc function for websocket connections
// It handles incoming websocket messages and routes the message according to
// channel parameter in channelMessage
func ConnectionEndpoint(w http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
logger.Error(err)
return
}
logger.Info("new ws connection")
c := NewClient(conn)
c.SetCloseHandler(closeHandler(c))
logger.Info("created new ws client")
go readHandler(c)
go writeHandler(c)
}
func readHandler(c *Client) {
defer func() {
logger.Info("Closing connection")
c.closeConnection()
}()
c.SetReadDeadline(time.Now().Add(pongWait))
c.SetPongHandler(func(string) error {
c.SetReadDeadline(time.Now().Add(pongWait))
return nil
})
msgs := make(chan *types.WebsocketMessage, 100)
defer close(msgs)
go func() {
for msg := range msgs {
logger.Info("msgs buffer length: ", len(msgs), ", will process msg", utils.JSON(msg))
socketChannels[msg.Channel](msg.Event, c)
}
logger.Info("done processing msgs chan")
}()
for {
msgType, payload, err := c.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
logger.Error(err)
}
return
}
if msgType != 1 {
return
}
msg := types.WebsocketMessage{}
if err := json.Unmarshal(payload, &msg); err != nil {
logger.Error(err)
go c.SendMessage(msg.Channel, "ERROR", err.Error())
return
}
logger.LogMessageIn(&msg)
logger.Infof("%v", msg.String())
if socketChannels[msg.Channel] == nil {
go c.SendMessage(msg.Channel, "ERROR", "INVALID_CHANNEL")
return
}
msgs <- &msg
//go socketChannels[msg.Channel](msg.Event, c)
}
}
func writeHandler(c *Client) {
ticker := time.NewTicker(pingPeriod)
defer func() {
logger.Info("Closing connection")
ticker.Stop()
c.closeConnection()
}()
for {
select {
case <-ticker.C:
c.SetWriteDeadline(time.Now().Add(writeWait))
err := c.WriteMessage(websocket.PingMessage, nil)
if err != nil {
logger.Error(err)
return
}
case m, ok := <-c.send:
c.SetWriteDeadline(time.Now().Add(writeWait))
if !ok {
c.WriteMessage(websocket.CloseMessage, []byte{})
return
}
logger.LogMessageOut(&m)
logger.Infof("%v", m.String())
err := c.WriteJSON(m)
if err != nil {
logger.Error(err)
return
}
}
}
}
func closeHandler(c *Client) func(code int, text string) error {
return func(code int, text string) error {
c.closeConnection()
return nil
}
}
// RegisterConnectionUnsubscribeHandler needs to be called whenever a connection subscribes to
// a new channel.
// At the time of connection closing the ConnectionUnsubscribeHandler handlers associated with
// that connection are triggered.
func RegisterConnectionUnsubscribeHandler(c *Client, fn func(*Client)) {
subscriptionMutex.Lock()
defer subscriptionMutex.Unlock()
logger.Info("Registering a new unsubscribe handler")
unsubscribeHandlers[c] = append(unsubscribeHandlers[c], fn)
}