You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
66 lines
1.9 KiB
66 lines
1.9 KiB
/*
|
|
* Copyright (c) 2013 IBM Corp.
|
|
*
|
|
* All rights reserved. This program and the accompanying materials
|
|
* are made available under the terms of the Eclipse Public License v1.0
|
|
* which accompanies this distribution, and is available at
|
|
* http://www.eclipse.org/legal/epl-v10.html
|
|
*
|
|
* Contributors:
|
|
* Seth Hoenig
|
|
* Allan Stockdill-Mander
|
|
* Mike Robertson
|
|
*/
|
|
|
|
package mqtt
|
|
|
|
import (
|
|
"errors"
|
|
"sync/atomic"
|
|
"time"
|
|
|
|
"github.com/eclipse/paho.mqtt.golang/packets"
|
|
)
|
|
|
|
func keepalive(c *client) {
|
|
defer c.workers.Done()
|
|
DEBUG.Println(PNG, "keepalive starting")
|
|
var checkInterval int64
|
|
var pingSent time.Time
|
|
|
|
if c.options.KeepAlive > 10 {
|
|
checkInterval = 5
|
|
} else {
|
|
checkInterval = c.options.KeepAlive / 2
|
|
}
|
|
|
|
intervalTicker := time.NewTicker(time.Duration(checkInterval * int64(time.Second)))
|
|
defer intervalTicker.Stop()
|
|
|
|
for {
|
|
select {
|
|
case <-c.stop:
|
|
DEBUG.Println(PNG, "keepalive stopped")
|
|
return
|
|
case <-intervalTicker.C:
|
|
DEBUG.Println(PNG, "ping check", time.Now().Unix()-atomic.LoadInt64(&c.lastSent))
|
|
if time.Now().Unix()-atomic.LoadInt64(&c.lastSent) >= c.options.KeepAlive || time.Now().Unix()-atomic.LoadInt64(&c.lastReceived) >= c.options.KeepAlive {
|
|
if atomic.LoadInt32(&c.pingOutstanding) == 0 {
|
|
DEBUG.Println(PNG, "keepalive sending ping")
|
|
ping := packets.NewControlPacket(packets.Pingreq).(*packets.PingreqPacket)
|
|
//We don't want to wait behind large messages being sent, the Write call
|
|
//will block until it it able to send the packet.
|
|
atomic.StoreInt32(&c.pingOutstanding, 1)
|
|
ping.Write(c.conn)
|
|
atomic.StoreInt64(&c.lastSent, time.Now().Unix())
|
|
pingSent = time.Now()
|
|
}
|
|
}
|
|
if atomic.LoadInt32(&c.pingOutstanding) > 0 && time.Now().Sub(pingSent) >= c.options.PingTimeout {
|
|
CRITICAL.Println(PNG, "pingresp not received, disconnecting")
|
|
c.errors <- errors.New("pingresp not received, disconnecting")
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|