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/*
* 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"
"git.eclipse.org/gitroot/paho/org.eclipse.paho.mqtt.golang.git/packets"
"sync"
"time"
)
type lastcontact struct {
sync.Mutex
lasttime time.Time
}
func (l *lastcontact) update() {
l.Lock()
defer l.Unlock()
l.lasttime = time.Now()
}
func (l *lastcontact) get() time.Time {
l.Lock()
defer l.Unlock()
return l.lasttime
}
func keepalive(c *Client) {
DEBUG.Println(PNG, "keepalive starting")
c.pingOutstanding = false
for {
select {
case <-c.stop:
DEBUG.Println(PNG, "keepalive stopped")
c.workers.Done()
return
default:
last := uint(time.Since(c.lastContact.get()).Seconds())
//DEBUG.Printf("%s last contact: %d (timeout: %d)", PNG, last, uint(c.options.KeepAlive.Seconds()))
if last > uint(c.options.KeepAlive.Seconds()) {
if !c.pingOutstanding {
DEBUG.Println(PNG, "keepalive sending ping")
ping := packets.NewControlPacket(packets.Pingreq).(*packets.PingreqPacket)
c.pingOutstanding = true
//We don't want to wait behind large messages being sent, the Write call
//will block until it it able to send the packet.
ping.Write(c.conn)
} else {
CRITICAL.Println(PNG, "pingresp not received, disconnecting")
c.workers.Done()
c.internalConnLost(errors.New("pingresp not received, disconnecting"))
return
}
}
time.Sleep(1 * time.Second)
}
}
}
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