+package r3xmppbot
+
+import (
+ xmpp "code.google.com/p/goexmpp"
+ "time"
+ "encoding/xml"
+)
+
+// XMPP Ping
+type XMPPPing struct {
+ XMLName xml.Name `xml:"urn:xmpp:ping ping"`
+}
+
+func HandleServerToClientPing(iq *xmpp.Iq, xmppout chan<- xmpp.Stanza) bool {
+ ///<iq from='juliet@capulet.lit/balcony' to='capulet.lit' id='s2c1' type='result'/>
+ if iq.Type != "get" { return false}
+ for _, ele := range iq.Nested {
+ if _, ok := ele.(*XMPPPing); ok {
+ xmppout <- &xmpp.Iq{Header: xmpp.Header{To: iq.From, From: iq.To, Id: iq.Id, Type: "result" }}
+ return true
+ }
+ }
+ return false
+}
+
+func (botdata *XmppBot) PingServer(timeout_ms time.Duration) (is_up bool) {
+///<iq from='juliet@capulet.lit/balcony' to='capulet.lit' id='c2s1' type='get'>
+/// <ping xmlns='urn:xmpp:ping'/>
+///</iq>
+ server_jid := new(xmpp.JID)
+ server_jid.Set(botdata.my_jid_)
+ iqping := &xmpp.Iq{Header: xmpp.Header{To: server_jid.Domain,
+ From: botdata.my_jid_,
+ Id: <-xmpp.Id,
+ Type: "get",
+ Nested: []interface{}{XMPPPing{}} } }
+ pong := make(chan bool, 1)
+ defer close(pong)
+ f := func(v xmpp.Stanza) bool {
+ defer recover() //recover from writing to possibly already closed chan
+ let_others_handle_stanza := false
+ iq, ok := v.(*xmpp.Iq)
+ if !ok {
+ Syslog_.Printf("response to iq ping wasn't iq: %s", v)
+ pong <- false
+ return true //let other handlers process reply
+ }
+ if iq.Type == "error" && iq.Error != nil && iq.Error.Type == "cancel"{
+ Debug_.Printf("response to iq ping was cancel, server does not support ping")
+ //server does not support ping, but at least we know server is still there
+ } else if iq.Type != "result" {
+ Syslog_.Printf("response to iq ping was not pong: %s", v)
+ let_others_handle_stanza = true //let other handlers process reply
+ }
+ pong <- true
+ return let_others_handle_stanza // return false so that Stanza v will not be appear in xmppclient_.Out()
+ }
+ botdata.xmppclient_.HandleStanza(iqping.Id, f)
+ botdata.xmppclient_.Out <- iqping
+ go func() {
+ defer func() {if x:= recover(); x == nil { Syslog_.Printf("response to iq ping timed out !!") }}() //recover from writing to possibly already closed chan. If we did not need to recover, then Handler did not receive reply
+ time.Sleep(timeout_ms * time.Millisecond)
+ pong <- false //xmpp ping timed out
+ }()
+ return <- pong
+}