SOAP and Python ZSI
Revision as of 15:39, 22 October 2007 by PeterHarding (talk | contribs)
See http://pywebsvcs.sourceforge.net/
Hi Folks,
Is there nobody who can help me with this more or less trivial
bit of code?
Greetings,
Sybren
On Sun, Oct 14, 2007 at 11:00:10PM +0200, Sybren Stüvel wrote:
> Hi folks,
>
> I'm trying to get some complex types to work between a very simple ZSI
> SOAP server and client. So you know what I'm talking about, I've
> placed the code at the bottom of this email.
>
> When running the server & client, I get this output on the server:
> calling the only exported method 'transfer', I get this (wrapped for
> email)
>
> $ ./zsi_server.py
> transfer:
> Positional: ({'dest': u'dst', 'source': u'src', 'Amount':
> {'currency': u'EUR',
> 'value': u'5322',
> 'fractional_digits': u'2'}},)
> Named: {}
> localhost - - [14/Oct/2007 22:48:03] "POST / HTTP/1.1" 500 -
> localhost - - [14/Oct/2007 22:48:03] "POST / HTTP/1.1" 200 -
>
> On the client I get the following output, again wrapped & indented for
> email readability:
>
> _________________________________ Sun Oct 14 22:48:03 2007 REQUEST:
> <SOAP-ENV:Envelope
> xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
> xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
> xmlns:ZSI="http://www.zolera.com/schemas/ZSI/"
> xmlns:xsd="http://www.w3.org/2001/XMLSchema"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
> <SOAP-ENV:Header/>
> <SOAP-ENV:Body>
> <transfer>
> <dest id="ob7d95860" xsi:type="xsd:string">dst</dest>
> <source id="ob7d95820" xsi:type="xsd:string">src</source>
> <Amount>
> <currency xsi:type="xsd:string">EUR</currency>
> <value>5322</value>
> <fractional_digits>2</fractional_digits>
> </Amount>
> </transfer>
> </SOAP-ENV:Body>
> </SOAP-ENV:Envelope>
> _________________________________ Sun Oct 14 22:48:03 2007 RESPONSE:
> 500
> Internal Server Error
> -------
> Server: ZSI/1.1 BaseHTTP/0.3 Python/2.5.1
> Date: Sun, 14 Oct 2007 20:48:03 GMT
> Content-type: text/xml; charset="utf-8"
> Content-Length: 701
>
> <SOAP-ENV:Envelope
> xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
> xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
> xmlns:ZSI="http://www.zolera.com/schemas/ZSI/"
> xmlns:xsd="http://www.w3.org/2001/XMLSchema"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
> <SOAP-ENV:Header/>
> <SOAP-ENV:Body>
> <SOAP-ENV:Fault>
> <faultcode>SOAP-ENV:Client</faultcode>
> <faultstring>Unparseable message</faultstring>
> <detail>
> <Eob7925758><ZSI:ParseFaultDetail>
> <ZSI:string>'int' object has no attribute 'typecode'</ZSI:string>
> <ZSI:trace></ZSI:trace>
> </ZSI:ParseFaultDetail>
> </Eob7925758>
> </detail>
> </SOAP-ENV:Fault>
> </SOAP-ENV:Body>
> </SOAP-ENV:Envelope>
>
> Traceback (most recent call last):
> File "./zsi_client.py", line 10, in <module>
> result = b.transfer(source='src', dest='dst', quantity=amount)
> File "/usr/lib/python2.5/site-packages/ZSI/client.py", line 64, in __call__
> **kw)
> File "/usr/lib/python2.5/site-packages/ZSI/client.py", line 171, in RPC
> return self.Receive(replytype, **kw)
> File "/usr/lib/python2.5/site-packages/ZSI/client.py", line 503, in Receive
> return _Binding.Receive(self, replytype, **kw)
> File "/usr/lib/python2.5/site-packages/ZSI/client.py", line 431, in Receive
> raise FaultException(msg)
> ZSI.FaultException: Unparseable message
> <ZSI:ParseFaultDetail>
> <ZSI:string>'int' object has no attribute 'typecode'</ZSI:string>
> <ZSI:trace></ZSI:trace>
> </ZSI:ParseFaultDetail>
>
>
> There are a few things weird here. First of all, I pass the third
> parameter using the name 'quantity', but it arrives named 'Amount'.
> How did that happen? Second, why do I get the parameters in a single
> dictionary, instead of passed as simply named parameters? And why
> can't I even return an integer?
>
> I hope someone can help me out here, since I'm completely at a loss
> how to fix this. To run my code, save the files then start "python
> zsi_server.py" and then "python zsi_client.py". I've done this using
> Python 2.5 and ZSI 2.0.
>
> Greetings,
> Sybren
>
> -v--v--v--v--v--v--v--v--v- complextypes.py -v--v--v--v--v--v--v--v--v-
> from ZSI import TC
>
> TC.TypeCode.typechecks = False
>
> class Amount(object):
> def __init__(self, currency, value, fractional_digits):
> '''Constructor'''
>
> self.currency = currency
> self.value = value
> self.fractional_digits = fractional_digits
>
> def __unicode__(self):
> return '''%s %.2f''' % (self.currency, float(self))
>
> def __str__(self):
> return unicode(self).encode('utf-8')
>
> def __repr__(self):
> return '''Amount('%s', %i, %i)''' % (self.currency,
> self.value, self.fractional_digits)
>
> Amount.typecode = TC.Struct(Amount, [
> TC.String('currency'),
> TC.Integer('value'),
> TC.Integer('fractional_digits')],
> 'Amount')
> -^--^--^--^--^--^--^--^--^- complextypes.py -^--^--^--^--^--^--^--^--^-
>
> As you can see, the complex type isn't that complex after all. Here is
> the module with the only exported function:
>
> -v--v--v--v--v--v--v--v--v- exported.py -v--v--v--v--v--v--v--v--v-
> from complextypes import Amount
>
> def transfer(*args, **kwargs):
> print 'transfer:'
> print '\tPositional: %s' % repr(args)
> print '\tNamed: %s' % repr(kwargs)
> return 0
>
> -^--^--^--^--^--^--^--^--^- exported.py -^--^--^--^--^--^--^--^--^-
>
> Here are the server and client applications:
>
> -v--v--v--v--v--v--v--v--v- zsi_server.py -v--v--v--v--v--v--v--v--v-
> #!/usr/bin/env python
>
> import ZSI.dispatch
>
> import complextypes
> import exported
>
> server = ZSI.dispatch.AsServer(
> port=8081,
> modules=[exported],
> typesmodule=complextypes)
> server.server_forever()
> -^--^--^--^--^--^--^--^--^- zsi_server.py -^--^--^--^--^--^--^--^--^-
>
> -v--v--v--v--v--v--v--v--v- zsi_client.py -v--v--v--v--v--v--v--v--v-
> #!/usr/bin/env python
>
> from ZSI.client import NamedParamBinding as NPBinding
> import sys
>
> from complextypes import Amount
>
> b = NPBinding(url='http://localhost:8081/', tracefile=sys.stdout)
> amount = Amount('EUR', 5322, 2)
> result = b.transfer(source='src', dest='dst', quantity=amount)
>
> print "Result: %s" % result
> -^--^--^--^--^--^--^--^--^- zsi_client.py -^--^--^--^--^--^--^--^--^-
>
>
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