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ping.go
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ping.go
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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package xmpp implements the XMPP IM protocol, as specified in RFC 6120 and
// 6121.
// Ping implements the XMPP extension Ping, as specified in xep-0199
package xmpp
import (
"errors"
"log"
"time"
"github.com/twstrike/coyim/xmpp/data"
)
// SendPing sends a Ping request.
func (c *conn) SendPing() (reply chan data.Stanza, cookie data.Cookie, err error) {
c.lastPingRequest = time.Now() //TODO: this seems should not belong to Conn
return c.SendIQ("", "get", data.PingRequest{})
}
// SendPingReply sends a reply to a Ping request.
func (c *conn) SendPingReply(id string) error {
return c.SendIQReply("", "result", id, data.EmptyReply{})
}
// ReceivePong update the timestamp for lastPongResponse,
func (c *conn) ReceivePong() {
c.lastPongResponse = time.Now() //TODO: this seems should not belong to Conn
}
// ParsePong parse a reply of a Pong response.
func ParsePong(reply data.Stanza) error {
iq, ok := reply.Value.(*data.ClientIQ)
if !ok {
return errors.New("xmpp: ping request resulted in tag of type " + reply.Name.Local)
}
switch iq.Type {
case "result":
return nil
case "error":
return errors.New("xmpp: ping request resulted in a error: " + iq.Error.Text)
default:
return errors.New("xmpp: ping request resulted in a unexpected type")
}
}
var (
pingIterval = 10 * time.Second //should be 5 minutes at least, per spec
pingTimeout = 30 * time.Second
maxPingFailures = 2
)
func (c *conn) watchPings() {
tick := time.NewTicker(pingIterval)
defer tick.Stop()
failures := 0
for _ = range tick.C {
if c.closed {
return
}
pongReply, _, err := c.SendPing()
if err != nil {
return
}
select {
case <-time.After(pingTimeout):
// ping timed out
failures = failures + 1
case pongStanza, ok := <-pongReply:
if !ok {
// pong cancelled
continue
}
failures = 0
iq, ok := pongStanza.Value.(*data.ClientIQ)
if !ok {
//not the expected IQ
return
}
//TODO: check for <service-unavailable/>
if iq.Type == "error" {
//server does not support Ping
return
}
}
if failures < maxPingFailures {
continue
}
log.Println("xmpp: ping failures reached threshold of", maxPingFailures)
go c.sendStreamError(data.StreamError{
DefinedCondition: data.ConnectionTimeout,
})
return
}
}