Calling Web Services from Python

Ivan Zuzak

Hello,

My Python application calls web services available on the Internet. The
web service being called is defined through application user input.

The Python built-in library allows access to web services using HTTP
protocol, which is not acceptible - generating SOAP messages for
arbitrary web services is something i wish to avoid.

I need a package/tool that generates web service proxies that will do
all the low-level HTTP work. (Someting like the WSDL.EXE tool in .NET
Framework) The ZSI and SOAPy packages [1] that i found (should) have
those functionalities but either have a bug (SOAPy) or either do not
work for arbitrary web services (ZSI). I tried the ZSI wsdl2py script on
a wsdl of one of my services, and the script crashes. I suppose the wsdl
was "too hard" for the script to parse.

Are there any other packages that utilize generation of web service
proxies that are compatible with SOAP & WSDL standards?

Thank you,
ivan zuzak

[1] - http://pywebsvcs.sourceforge.net/

Apr 7 '06 #1

Subscribe Post Reply

4248

John Salerno

Ivan Zuzak wrote:

I need a package/tool that generates web service proxies that will do
all the low-level HTTP work. (Someting like the WSDL.EXE tool in .NET
Framework) The ZSI and SOAPy packages [1] that i found (should) have
those functionalities but either have a bug (SOAPy) or either do not
work for arbitrary web services (ZSI).

You might want to read this, specifically 12.5 and 12.6 for WSDL:
http://diveintopython.org/soap_web_services/index.html

It uses SOAPpy, which may or may not be different than SOAPy, depending
on if you made a typo or not. :)

Apr 7 '06 #2

m.banaouas

Can you tell us more about SOAPpy bug ?
Is it about authentication ?

Ivan Zuzak a écrit :

...
I need a package/tool that generates web service proxies that will do
all the low-level HTTP work. (Someting like the WSDL.EXE tool in .NET
Framework) The ZSI and SOAPy packages [1] that i found (should) have
those functionalities but either have a bug (SOAPy) or either do not
work for arbitrary web services (ZSI).
...

Apr 9 '06 #3

Ivan Zuzak

m.banaouas wrote:

Can you tell us more about SOAPpy bug ?
Is it about authentication ?

Ivan Zuzak a écrit :
...
I need a package/tool that generates web service proxies that will do
all the low-level HTTP work. (Someting like the WSDL.EXE tool in .NET
Framework) The ZSI and SOAPy packages [1] that i found (should) have
those functionalities but either have a bug (SOAPy) or either do not
work for arbitrary web services (ZSI). ...

SOAPy : http://soapy.sourceforge.net/
SOAPPy : http://pywebsvcs.sourceforge.net/

The bugged one is SOAPy (parsing errors and something else). I just
downloaded and tried SOAPPy and that one crashes too. I get an "Index
out of range" error while parsing the wsdl ( in XMLSchema.py ). The
traceback is a bit long, so I wont list the whole thing here.

Bellow this message is the wsdl of the service for which im trying to
get a proxy. If anyone manages to get a proxy out of it - please let me
know :).

Thank you for your help,
Ivan

//////////////////////// WSDL START ////////////////////////////////

<?xml version="1.0" encoding="utf-8"?>
<wsdl:definitions xmlns:s1="http://www.ris.fer.hr/overlay/addressing"
xmlns:http="http://schemas.xmlsoap.org/wsdl/http/"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:s="http://www.w3.org/2001/XMLSchema"
xmlns:s3="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/MailBox/MessageStatistics"

xmlns:s2="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/XmlDoc"
xmlns:s4="http://ris.zemris.fer.hr/remotingSchema"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:tns="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/MailBox"

xmlns:tm="http://microsoft.com/wsdl/mime/textMatching/"
xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/"
targetNamespace="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/MailBox"

xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/">
<wsdl:types>
<s:schema elementFormDefault="qualified"
targetNamespace="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/MailBox">
<s:import namespace="http://www.ris.fer.hr/overlay/addressing" />
<s:import
namespace="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/XmlDoc"

/>
<s:element name="Create">
<s:complexType>
<s:sequence>
<s:element minOccurs="0" maxOccurs="1" name="mbID"
type="s:string" />
<s:element minOccurs="0" maxOccurs="1"
ref="s1:EndpointReference" />
</s:sequence>
</s:complexType>
</s:element>
<s:element name="CreateResponse">
<s:complexType>
<s:sequence>
<s:element minOccurs="1" maxOccurs="1" name="CreateResult"
type="s:boolean" />
</s:sequence>
</s:complexType>
</s:element>
<s:element name="ResourceID" type="tns:ResourceID" />
<s:complexType name="ResourceID" mixed="true">
<s:annotation>
<s:appinfo>
<keepNamespaceDeclarations>xmlns</keepNamespaceDeclarations>
</s:appinfo>
</s:annotation>
</s:complexType>
<s:element name="Destroy">
<s:complexType>
<s:sequence>
<s:element minOccurs="0" maxOccurs="1"
ref="s1:EndpointReference" />
</s:sequence>
</s:complexType>
</s:element>
<s:element name="DestroyResponse">
<s:complexType>
<s:sequence>
<s:element minOccurs="1" maxOccurs="1" name="DestroyResult"
type="s:boolean" />
</s:sequence>
</s:complexType>
</s:element>
<s:element name="PutMessage">
<s:complexType>
<s:sequence>
<s:element minOccurs="1" maxOccurs="1" ref="s2:xmlDoc" />
<s:element minOccurs="0" maxOccurs="1"
ref="s1:EndpointReference" />
</s:sequence>
</s:complexType>
</s:element>
<s:element name="PutMessageResponse">
<s:complexType>
<s:sequence>
<s:element minOccurs="1" maxOccurs="1"
name="PutMessageResult" type="s:boolean" />
</s:sequence>
</s:complexType>
</s:element>
<s:element name="GetMessage">
<s:complexType>
<s:sequence>
<s:element minOccurs="1" maxOccurs="1" name="timeParam"
type="s:int" />
<s:element minOccurs="0" maxOccurs="1" name="cb"
type="s:string" />
<s:element minOccurs="0" maxOccurs="1"
ref="s1:EndpointReference" />
</s:sequence>
</s:complexType>
</s:element>
<s:element name="GetMessageResponse">
<s:complexType>
<s:sequence>
<s:any minOccurs="0" maxOccurs="1" />
</s:sequence>
</s:complexType>
</s:element>
<s:element name="FlushPerformanceLog">
<s:complexType />
</s:element>
<s:element name="FlushPerformanceLogResponse">
<s:complexType />
</s:element>
<s:element name="GetPerformanceLog">
<s:complexType />
</s:element>
<s:element name="GetPerformanceLogResponse">
<s:complexType>
<s:sequence>
<s:element minOccurs="0" maxOccurs="1"
name="GetPerformanceLogResult">
<s:complexType mixed="true">
<s:sequence>
<s:any />
</s:sequence>
</s:complexType>
</s:element>
</s:sequence>
</s:complexType>
</s:element>
</s:schema>
<s:schema elementFormDefault="qualified"
targetNamespace="http://www.ris.fer.hr/overlay/addressing">
<s:element name="EndpointReference"
type="s1:EndpointReferenceType" />
<s:complexType name="EndpointReferenceType">
<s:annotation>
<s:appinfo>
<keepNamespaceDeclarations>xmlns</keepNamespaceDeclarations>
</s:appinfo>
</s:annotation>
<s:sequence>
<s:element minOccurs="0" maxOccurs="1" name="Address"
type="s1:AttributedURI" />
<s:element minOccurs="0" maxOccurs="1" name="RemotingAddress"
type="s1:AttributedURI" />
<s:element minOccurs="0" maxOccurs="1"
name="ReferenceProperties" type="s1:ReferencePropertiesType" />
<s:element minOccurs="0" maxOccurs="1" name="PortType"
type="s1:AttributedQName" />
<s:element minOccurs="0" maxOccurs="1" name="ServiceName"
type="s1:ServiceNameType" />
<s:element minOccurs="0" maxOccurs="1" name="To"
type="s1:AttributedURI" />
<s:element minOccurs="0" maxOccurs="1" name="From"
type="s1:EndpointReferenceType" />
</s:sequence>
</s:complexType>
<s:complexType name="AttributedURI">
<s:simpleContent>
<s:extension base="s:anyURI" />
</s:simpleContent>
</s:complexType>
<s:complexType name="ReferencePropertiesType">
<s:annotation>
<s:appinfo>
<keepNamespaceDeclarations>xmlns</keepNamespaceDeclarations>
</s:appinfo>
</s:annotation>
<s:sequence>
<s:any minOccurs="0" maxOccurs="unbounded" />
</s:sequence>
</s:complexType>
<s:complexType name="AttributedQName">
<s:simpleContent>
<s:extension base="s:QName" />
</s:simpleContent>
</s:complexType>
<s:complexType name="ServiceNameType">
<s:simpleContent>
<s:extension base="s:QName">
<s:attribute name="PortName" type="s:NCName" />
</s:extension>
</s:simpleContent>
</s:complexType>
<s:element name="FacilityID" type="s1:FacilityID" />
<s:complexType name="FacilityID" mixed="true">
<s:annotation>
<s:appinfo>
<keepNamespaceDeclarations>xmlns</keepNamespaceDeclarations>
</s:appinfo>
</s:annotation>
</s:complexType>
<s:element name="To" type="s1:ToAttributedURI" />
<s:complexType name="ToAttributedURI" mixed="true">
<s:anyAttribute />
</s:complexType>
</s:schema>
<s:schema elementFormDefault="qualified"
targetNamespace="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/XmlDoc">
<s:element name="xmlDoc" nillable="true" type="s2:XmlDoc" />
<s:complexType name="XmlDoc" mixed="true">
<s:sequence>
<s:any minOccurs="0" maxOccurs="unbounded" />
</s:sequence>
<s:anyAttribute />
</s:complexType>
</s:schema>
<s:schema elementFormDefault="qualified"
targetNamespace="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/MailBox/MessageStatistics">
<s:element name="MessageStatistics" type="s3:MessageStatistics" />
<s:complexType name="MessageStatistics">
<s:sequence>
<s:element minOccurs="1" maxOccurs="1" name="messageWaiting"
type="s:double" />
</s:sequence>
</s:complexType>
</s:schema>
<s:schema elementFormDefault="qualified"
targetNamespace="http://ris.zemris.fer.hr/remotingSchema">
<s:element name="service" type="s4:Service" />
<s:complexType name="Service">
<s:sequence>
<s:element minOccurs="0" maxOccurs="1" name="class"
type="s4:Classes" />
</s:sequence>
<s:attribute name="name" type="s:string" />
<s:attribute name="location" type="s:string" />
</s:complexType>
<s:complexType name="Classes">
<s:sequence>
<s:element minOccurs="0" maxOccurs="unbounded" name="method"
type="s4:Methods" />
</s:sequence>
<s:attribute name="name" type="s:string" />
<s:attribute name="namespace" type="s:string" />
</s:complexType>
<s:complexType name="Methods">
<s:sequence>
<s:element minOccurs="0" maxOccurs="unbounded" name="param"
type="s4:Params" />
</s:sequence>
<s:attribute name="name" type="s:string" />
<s:attribute name="returnType" type="s:string" />
</s:complexType>
<s:complexType name="Params">
<s:attribute name="name" type="s:string" />
<s:attribute name="type" type="s:string" />
</s:complexType>
</s:schema>
</wsdl:types>
<wsdl:message name="CreateSoapIn">
<wsdl:part name="parameters" element="tns:Create" />
</wsdl:message>
<wsdl:message name="CreateSoapOut">
<wsdl:part name="parameters" element="tns:CreateResponse" />
</wsdl:message>
<wsdl:message name="CreateFacilityID">
<wsdl:part name="FacilityID" element="s1:FacilityID" />
</wsdl:message>
<wsdl:message name="CreateResourceID">
<wsdl:part name="ResourceID" element="tns:ResourceID" />
</wsdl:message>
<wsdl:message name="CreateTo">
<wsdl:part name="To" element="s1:To" />
</wsdl:message>
<wsdl:message name="DestroySoapIn">
<wsdl:part name="parameters" element="tns:Destroy" />
</wsdl:message>
<wsdl:message name="DestroySoapOut">
<wsdl:part name="parameters" element="tns:DestroyResponse" />
</wsdl:message>
<wsdl:message name="DestroyFacilityID">
<wsdl:part name="FacilityID" element="s1:FacilityID" />
</wsdl:message>
<wsdl:message name="DestroyResourceID">
<wsdl:part name="ResourceID" element="tns:ResourceID" />
</wsdl:message>
<wsdl:message name="DestroyTo">
<wsdl:part name="To" element="s1:To" />
</wsdl:message>
<wsdl:message name="PutMessageSoapIn">
<wsdl:part name="parameters" element="tns:PutMessage" />
</wsdl:message>
<wsdl:message name="PutMessageSoapOut">
<wsdl:part name="parameters" element="tns:PutMessageResponse" />
</wsdl:message>
<wsdl:message name="PutMessageFacilityID">
<wsdl:part name="FacilityID" element="s1:FacilityID" />
</wsdl:message>
<wsdl:message name="PutMessageResourceID">
<wsdl:part name="ResourceID" element="tns:ResourceID" />
</wsdl:message>
<wsdl:message name="PutMessageTo">
<wsdl:part name="To" element="s1:To" />
</wsdl:message>
<wsdl:message name="GetMessageSoapIn">
<wsdl:part name="parameters" element="tns:GetMessage" />
</wsdl:message>
<wsdl:message name="GetMessageSoapOut">
<wsdl:part name="parameters" element="tns:GetMessageResponse" />
</wsdl:message>
<wsdl:message name="GetMessageFacilityID">
<wsdl:part name="FacilityID" element="s1:FacilityID" />
</wsdl:message>
<wsdl:message name="GetMessageResourceID">
<wsdl:part name="ResourceID" element="tns:ResourceID" />
</wsdl:message>
<wsdl:message name="GetMessageTo">
<wsdl:part name="To" element="s1:To" />
</wsdl:message>
<wsdl:message name="GetMessageMessageStatistics">
<wsdl:part name="MessageStatistics" element="s3:MessageStatistics" />
</wsdl:message>
<wsdl:message name="FlushPerformanceLogSoapIn">
<wsdl:part name="parameters" element="tns:FlushPerformanceLog" />
</wsdl:message>
<wsdl:message name="FlushPerformanceLogSoapOut">
<wsdl:part name="parameters"
element="tns:FlushPerformanceLogResponse" />
</wsdl:message>
<wsdl:message name="GetPerformanceLogSoapIn">
<wsdl:part name="parameters" element="tns:GetPerformanceLog" />
</wsdl:message>
<wsdl:message name="GetPerformanceLogSoapOut">
<wsdl:part name="parameters" element="tns:GetPerformanceLogResponse" />
</wsdl:message>
<wsdl:message name="GetPerformanceLogservice">
<wsdl:part name="service" element="s4:service" />
</wsdl:message>
<wsdl:portType name="MailBoxSoap">
<wsdl:operation name="Create">
<wsdl:input message="tns:CreateSoapIn" />
<wsdl:output message="tns:CreateSoapOut" />
</wsdl:operation>
<wsdl:operation name="Destroy">
<wsdl:input message="tns:DestroySoapIn" />
<wsdl:output message="tns:DestroySoapOut" />
</wsdl:operation>
<wsdl:operation name="PutMessage">
<wsdl:input message="tns:PutMessageSoapIn" />
<wsdl:output message="tns:PutMessageSoapOut" />
</wsdl:operation>
<wsdl:operation name="GetMessage">
<wsdl:input message="tns:GetMessageSoapIn" />
<wsdl:output message="tns:GetMessageSoapOut" />
</wsdl:operation>
<wsdl:operation name="FlushPerformanceLog">
<wsdl:input message="tns:FlushPerformanceLogSoapIn" />
<wsdl:output message="tns:FlushPerformanceLogSoapOut" />
</wsdl:operation>
<wsdl:operation name="GetPerformanceLog">
<wsdl:input message="tns:GetPerformanceLogSoapIn" />
<wsdl:output message="tns:GetPerformanceLogSoapOut" />
</wsdl:operation>
</wsdl:portType>
<wsdl:binding name="MailBoxSoap" type="tns:MailBoxSoap">
<soap:binding transport="http://schemas.xmlsoap.org/soap/http"
style="document" />
<wsdl:operation name="Create">
<soap:operation
soapAction="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/MailBox/Create"

style="document" />
<wsdl:input>
<soap:body use="literal" />
<soap:header message="tns:CreateFacilityID" part="FacilityID"
use="literal" />
<soap:header message="tns:CreateTo" part="To" use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
<soap:header message="tns:CreateResourceID" part="ResourceID"
use="literal" />
</wsdl:output>
</wsdl:operation>
<wsdl:operation name="Destroy">
<soap:operation
soapAction="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/MailBox/Destroy"

style="document" />
<wsdl:input>
<soap:body use="literal" />
<soap:header message="tns:DestroyFacilityID" part="FacilityID"
use="literal" />
<soap:header message="tns:DestroyResourceID" part="ResourceID"
use="literal" />
<soap:header message="tns:DestroyTo" part="To" use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
</wsdl:operation>
<wsdl:operation name="PutMessage">
<soap:operation
soapAction="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/MailBox/PutMessage"

style="document" />
<wsdl:input>
<soap:body use="literal" />
<soap:header message="tns:PutMessageFacilityID"
part="FacilityID" use="literal" />
<soap:header message="tns:PutMessageResourceID"
part="ResourceID" use="literal" />
<soap:header message="tns:PutMessageTo" part="To" use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
</wsdl:operation>
<wsdl:operation name="GetMessage">
<soap:operation
soapAction="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/MailBox/GetMessage"

style="document" />
<wsdl:input>
<soap:body use="literal" />
<soap:header message="tns:GetMessageFacilityID"
part="FacilityID" use="literal" />
<soap:header message="tns:GetMessageResourceID"
part="ResourceID" use="literal" />
<soap:header message="tns:GetMessageTo" part="To" use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
<soap:header message="tns:GetMessageMessageStatistics"
part="MessageStatistics" use="literal" />
</wsdl:output>
</wsdl:operation>
<wsdl:operation name="FlushPerformanceLog">
<soap:operation
soapAction="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/MailBox/FlushPerformanceLog"

style="document" />
<wsdl:input>
<soap:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
</wsdl:operation>
<wsdl:operation name="GetPerformanceLog">
<soap:operation
soapAction="http://www.ris.fer.hr/OpenCollectives/CoopetitionServices/MailBox/GetPerformanceLog"

style="document" />
<wsdl:input>
<soap:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
<soap:header message="tns:GetPerformanceLogservice"
part="service" use="literal" />
</wsdl:output>
</wsdl:operation>
</wsdl:binding>
<wsdl:service name="MailBox">
<documentation xmlns="http://schemas.xmlsoap.org/wsdl/" />
<wsdl:port name="MailBoxSoap" binding="tns:MailBoxSoap">
<soap:address
location="http://localhost/coopetitionservices/mailbox/MailBox.asmx" />
</wsdl:port>
</wsdl:service>
</wsdl:definitions>

//////////////////////////// WSDL END /////////////////////////////

Apr 11 '06 #4

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