[Twisted-Python] XmlStream and addObserver - root element's name?
Hello! There's a problem I can't find an answer to. I'd like to design Xml based protocol. I've found XmlStream, read doc and found addObserver method. I wrote simple code: class XmlTest(xmlstream.XmlStream): # (...) def connectionMade(self): xmlstream.XmlStream.connectionMade(self) self.addObserver("/frame", self.frameHandler) # (...) # (...) def frameHandler(self, data): print "Wilma, I'm Home!" When I send XML with frame element as a root: <frame> <whatever/> </frame> FrameHandler isn't executed, but if I put frame element inside some other root element: <sheep> <frame> <whatever/> </frame> </sheep> Then my handler is activated. Why? First, I thought maybe my XPath knowledge is wrong, so I checked few tutorials[1] and they told me there's something wrong with addObserver method. How to make it working? ~MG. (Hi, I'm new here :)
Hello Marcin,
XmlStream is an implementation of XMPP/Jabber protocol (which is widely used
for Instant Messaging). If you have time please read about this on
www.xmpp.org. The reason why /frame handler was not executed is because
XMPP/Jabber sessions starts and ends with streams like for example:
<*stream*:*stream* xmlns:*stream*="http://etherx.jabber.org/streams">
.
.
.
class XmlTest(xmlstream.XmlStream):
# (...)
def connectionMade(self):
xmlstream.XmlStream.connectionMade(self)
self.addObserver("/frame", self.frameHandler)
# (...) # (...) def frameHandler(self, data):
print "Wilma, I'm Home!" When I send XML with frame element as a root: <frame>
<whatever/>
</frame> FrameHandler isn't executed, but if I put frame element inside some
other root element: <sheep>
<frame>
<whatever/>
</frame>
</sheep> Then my handler is activated. Why? First, I thought maybe my XPath
knowledge is wrong,
so I checked few tutorials[1] and they told me there's something wrong with
addObserver method. How to make it working? ~MG.
(Hi, I'm new here :) _______________________________________________
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2008/12/17 Alvin Delagon:
XmlStream is an implementation of XMPP/Jabber protocol (which is widely used for Instant Messaging).
Which XmlStream? I've found two: XMPP: twisted.words.protocols.jabber.xmlstream X-ish: twisted.words.xish.xmlstream I've been trying to use the second one. Are they the same?
You might want to take a look at twisted XML-RPC libraries.
Sure, I will. Thanks :) ~MG.
Hello Marcin, Marcin Gliński wrote:
2008/12/17 Alvin Delagon:
XmlStream is an implementation of XMPP/Jabber protocol (which is widely used for Instant Messaging).
Which XmlStream? I've found two:
XMPP: twisted.words.protocols.jabber.xmlstream X-ish: twisted.words.xish.xmlstream
I've been trying to use the second one. Are they the same?
use the second one, unless you are writing a Jabber client/server. The Xish one is more generic, I use it in my apps. Imagine that the XMPP session is like one giant XMPP msg/document, it's root element/node is <stream/>, a session must be opened by each party if it's bidirectional : Client Server | <stream> | |----------------------------------------->| | | open the session | <stream> | |<-----------------------------------------| | | | <msg>.....</msg> | |----------------------------------------->| | | exchange msgs (as many as you want) | <msg>.....</msg> | |<-----------------------------------------| | | | </stream> | |----------------------------------------->| | | close the session when done | </stream> | |<-----------------------------------------| | | I hope this helps, Gabriel
You might want to take a look at twisted XML-RPC libraries.
Sure, I will. Thanks :)
~MG.
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Gabriel Rossetti wrote:
Hello Marcin,
Marcin Gliński wrote:
2008/12/17 Alvin Delagon:
XmlStream is an implementation of XMPP/Jabber protocol (which is widely used for Instant Messaging).
Which XmlStream? I've found two:
XMPP: twisted.words.protocols.jabber.xmlstream X-ish: twisted.words.xish.xmlstream
I've been trying to use the second one. Are they the same?
use the second one, unless you are writing a Jabber client/server. The Xish one is more generic, I use it in my apps. Imagine that the XMPP session is like one giant XMPP msg/document, it's root element/node is <stream/>, a session must be opened by each party if it's bidirectional :
Client Server | <stream> | |----------------------------------------->| | | open the session | <stream> | |<-----------------------------------------| | | | <msg>.....</msg> | |----------------------------------------->| | | exchange msgs (as many as you want) | <msg>.....</msg> | |<-----------------------------------------| | | | </stream> | |----------------------------------------->| | | close the session when done | </stream> | |<-----------------------------------------| | |
I hope this helps, Gabriel
oups, the spaces got eaten up, those pipe ('|') symbols are supposed to be aligned on the right side....
You might want to take a look at twisted XML-RPC libraries.
Sure, I will. Thanks :)
~MG.
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participants (3)
-
Alvin Delagon -
Gabriel Rossetti -
Marcin Gliński