112 lines
2.5 KiB
Go
112 lines
2.5 KiB
Go
package main
|
|
|
|
import (
|
|
"log"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/gorilla/websocket"
|
|
)
|
|
|
|
const TIMEOUT = 6
|
|
const IDLE_TIMEOUT = TIMEOUT * time.Second
|
|
const PING_INTERVAL = (TIMEOUT - 1) * time.Second
|
|
|
|
type WSConnection struct {
|
|
url string
|
|
conn *websocket.Conn
|
|
errChan chan error
|
|
writeLock sync.Mutex
|
|
ReadChan chan string
|
|
WriteChan chan string
|
|
}
|
|
|
|
func (ws *WSConnection) messageReader() {
|
|
log.Printf("Reading messages")
|
|
for {
|
|
_, message, err := ws.conn.ReadMessage()
|
|
ws.conn.SetReadDeadline(time.Now().Add(IDLE_TIMEOUT))
|
|
if err != nil {
|
|
ws.errChan <- err
|
|
return
|
|
}
|
|
log.Printf("Received: %s", message)
|
|
ws.ReadChan <- string(message)
|
|
}
|
|
}
|
|
|
|
func (ws *WSConnection) messageSender() {
|
|
log.Printf("Sending messages")
|
|
for {
|
|
msg := <-ws.WriteChan
|
|
ws.writeLock.Lock()
|
|
|
|
ws.conn.SetWriteDeadline(time.Now().Add(IDLE_TIMEOUT))
|
|
log.Printf("Sending: %s", msg)
|
|
err := ws.conn.WriteMessage(websocket.TextMessage, []byte(msg))
|
|
if err != nil {
|
|
log.Printf("Error during message writing: %v", err)
|
|
ws.errChan <- err
|
|
return
|
|
}
|
|
ws.writeLock.Unlock()
|
|
}
|
|
}
|
|
|
|
func (ws *WSConnection) pinger() {
|
|
log.Printf("Starting pinger, sleeping for %v", PING_INTERVAL)
|
|
for {
|
|
time.Sleep(PING_INTERVAL)
|
|
|
|
// log.Printf("Ping")
|
|
ws.writeLock.Lock()
|
|
err := ws.conn.WriteMessage(websocket.PingMessage, nil)
|
|
if err != nil {
|
|
log.Println("Error during ping:", err)
|
|
ws.errChan <- err
|
|
return
|
|
}
|
|
ws.writeLock.Unlock()
|
|
}
|
|
}
|
|
|
|
func (ws *WSConnection) handleError() {
|
|
for {
|
|
err := <-ws.errChan
|
|
log.Println("Error during message reading:", err)
|
|
|
|
time.Sleep(5 * time.Second)
|
|
ws.Open()
|
|
}
|
|
}
|
|
|
|
func (ws *WSConnection) Open() {
|
|
log.Printf("Connecting to %s", ws.url)
|
|
conn, _, err := websocket.DefaultDialer.Dial(ws.url, nil)
|
|
if err != nil {
|
|
log.Println("Error during connection:", err)
|
|
ws.errChan <- err
|
|
return
|
|
}
|
|
log.Printf("Connected")
|
|
ws.conn = conn
|
|
ws.errChan = make(chan error)
|
|
ws.ReadChan = make(chan string, 1024)
|
|
ws.WriteChan = make(chan string, 1024)
|
|
|
|
ws.conn.SetReadLimit(1024)
|
|
ws.conn.SetReadDeadline(time.Now().Add(IDLE_TIMEOUT))
|
|
ws.conn.SetWriteDeadline(time.Now().Add(IDLE_TIMEOUT))
|
|
ws.conn.SetPongHandler(func(string) error {
|
|
// log.Println("Pong")
|
|
ws.conn.SetReadDeadline(time.Now().Add(IDLE_TIMEOUT))
|
|
ws.conn.SetWriteDeadline(time.Now().Add(IDLE_TIMEOUT))
|
|
return nil
|
|
})
|
|
|
|
go ws.messageReader()
|
|
go ws.messageSender()
|
|
go ws.handleError()
|
|
go ws.pinger()
|
|
}
|