Dealing with exceptions from the web services

[Donald W. Long]

Message: 3 
Date: Tue, 25 May 2010 10:43:09 -0800 
From: "Joshua J. Kugler" <joshua(a)eeinternet.com&gt; 
Subject: Re: [Fedora-suds-list] Dealing with exceptions from the web 
  services 
To: suds(a)lists.fedoraproject.org, "Donald W. Long" 
  <donald.w.long(a)gmail.com&gt; 
Message-ID: <201005251043.09590.joshua(a)eeinternet.com&gt; 
Content-Type: text/plain; charset="iso-8859-1" 

On Tuesday 25 May 2010, Donald W. Long elucidated thus: 
> I found that if the service returns a string value and the service 
> throws an exception i can look at the result and it will contain 
> 'soap:Server', but if the service returns void then you can not tell 
> if you have an error or not. 
>
>
> But what I am really trying to figure out, is how do you see what 
> exception the service has thrown. 
>
> You may noticed that I am using the WindowsHttpAuthenticated, this is 
> required for access to the server that is running the web services. 
>  
If you are not seeing a suds.WebFault raised then the service is not 
raising a SOAPFault, and thus is returning error information to you 
other ways. If the service does not raise a SOAPFault on errors, then 
you will have to wrap the call and raise an exception if an error 
condition is returned. 
  
I understand the above but we did a test with C#, below is some of the 
code and we get a soap error.
  
  
public partial class _Default : System.Web.UI.page
{
     protected void Page_load(object sender, EventArgs e)
     {
         SAWebServices ws = new SAWebService();
         try
         {
             ws.GetBuildLocation(string.Empty);
         }
         catch (SoapException se)
         {
             Response.Write(se.Detail);
         }
     }
}
  
the above code will get a SoapException if an empty string is sent to 
GetBuildLocation.  The service is written in .NET ASP.  From what I 
have been told, Microsoft always converts the exception into a Soap 
Exception.  When we also use perl we get an exception for the client 
code but not using python and suds.  Should the SoapException be 
something else?
  
We are at a loss on this one and not sure how to continue using suds 
with Python.  Given all other languages that we use, C# and perl we get 
an exception from it.  With Python and suds we only get a string that 
says Soap:Server.  
  
What type of exception should we throw for the web service, and what I 
do not understand is given all these other languages and packages work, 
what is the difference between suds and what they are doing.  Most of 
the developers in my area feel that suds is not handling exceptions 
correctly, me, I am not sure, I am new at soap.
  
If you have any recommendations on what we should do then please let us 
know.  We would really like to move to Python and suds.
  
Have a nice day 
  
Donald W. Long
Email:    Donald.W.Long(a)thelongsfamily.com
Skype:  Donald.W.Long

[Donald W. Long]

more data.  Below is the log output from client
  
DEBUG:suds.client:sending to (http://kwweb01:8080/SAWebService.asmx)
message:
<SOAP-ENV:Envelope xmlns:ns0="http://www.qualcomm.com/QCT/QSWAT/SAWebService"
xmlns:ns1="http://schemas.xmlsoap.org/soap/envelope/
" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    <SOAP-ENV:Header/>
    <ns1:Body>
       <ns0:GetBuildLocation>
          <ns0:BuildID></ns0:BuildID>
       </ns0:GetBuildLocation>
    </ns1:Body>
</SOAP-ENV:Envelope>
DEBUG:suds.client:headers = {'SOAPAction':
u'"http://www.qualcomm.com/QCT/QSWAT/SAWebService/GetBuildLocati...;, 
'Content-Type': '
text/xml'}
DEBUG:suds.client:http succeeded:
<?xml version="1.0" encoding="utf-8"?><soap:Envelope
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="http://www.
w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body&g...
ode><faultstring>Server was unable to process request. ---&gt; Build ID 
cannot be empty</faultstring><detail /></soap:Fault></soap
:Body></soap:Envelope>
  
When I look at the xml returned I sse the faultcode as soap:Server.  Is 
this a correct web fault xml item?  Also, how do I get to the 
<faultstring> area, if I can do this I could find out what the error is.
  
Thanks
  
Donald W. Long
Email:    Donald.W.Long(a)thelongsfamily.com
Skype:  Donald.W.Long

------ Original Message ------
From: "Donald W. Long" <donald.w.long(a)gmail.com&gt;
To: suds(a)lists.fedoraproject.org
Sent: 5/26/2010 2:25:48 PM
Subject: Dealing with exceptions from the web services 
> Message: 3 
> Date: Tue, 25 May 2010 10:43:09 -0800 
> From: "Joshua J. Kugler" <joshua(a)eeinternet.com&gt; 
> Subject: Re: [Fedora-suds-list] Dealing with exceptions from the web 
>  services 
> To: suds(a)lists.fedoraproject.org, "Donald W. Long" 
>  <donald.w.long(a)gmail.com&gt; 
> Message-ID: <201005251043.09590.joshua(a)eeinternet.com&gt; 
> Content-Type: text/plain; charset="iso-8859-1" 
>
> On Tuesday 25 May 2010, Donald W. Long elucidated thus: 
> >I found that if the service returns a string value and the service 
> >throws an exception i can look at the result and it will contain 
> >'soap:Server', but if the service returns void then you can not tell 
> >if you have an error or not. 
> >
> >
> >But what I am really trying to figure out, is how do you see what 
> >exception the service has thrown. 
> >
> >You may noticed that I am using the WindowsHttpAuthenticated, this is 
> >required for access to the server that is running the web services. 
>
> If you are not seeing a suds.WebFault raised then the service is not 
> raising a SOAPFault, and thus is returning error information to you 
> other ways. If the service does not raise a SOAPFault on errors, then 
> you will have to wrap the call and raise an exception if an error 
> condition is returned. 
>  
> I understand the above but we did a test with C#, below is some of the 
> code and we get a soap error.
>  
>  
> public partial class _Default : System.Web.UI.page
> {
>     protected void Page_load(object sender, EventArgs e)
>     {
>         SAWebServices ws = new SAWebService();
>         try
>         {
>             ws.GetBuildLocation(string.Empty);
>         }
>         catch (SoapException se)
>         {
>             Response.Write(se.Detail);
>         }
>     }
> }
>  
> the above code will get a SoapException if an empty string is sent to 
> GetBuildLocation.  The service is written in .NET ASP.  From what I 
> have been told, Microsoft always converts the exception into a Soap 
> Exception.  When we also use perl we get an exception for the client 
> code but not using python and suds.  Should the SoapException be 
> something else?
>  
> We are at a loss on this one and not sure how to continue using suds 
> with Python.  Given all other languages that we use, C# and perl we 
> get an exception from it.  With Python and suds we only get a string 
> that says Soap:Server.  
>  
> What type of exception should we throw for the web service, and what I 
> do not understand is given all these other languages and packages 
> work, what is the difference between suds and what they are doing.  
> Most of the developers in my area feel that suds is not handling 
> exceptions correctly, me, I am not sure, I am new at soap.
>  
> If you have any recommendations on what we should do then please let 
> us know.  We would really like to move to Python and suds.
>  
> Have a nice day 
>  
> Donald W. Long
> Email:    Donald.W.Long(a)thelongsfamily.com
> Skype:  Donald.W.Long
>

[Jeff Ortel]

On 05/27/2010 08:21 AM, Donald W. Long wrote:
>  more data.  Below is the log output from client
>  DEBUG:suds.client:sending to (http://kwweb01:8080/SAWebService.asmx)
>  message:
>  <SOAP-ENV:Envelope
>  xmlns:ns0="http://www.qualcomm.com/QCT/QSWAT/SAWebService"
>  xmlns:ns1="http://schemas.xmlsoap.org/soap/envelope/
>  " xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>  xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
>  <SOAP-ENV:Header/>
>  <ns1:Body>
>  <ns0:GetBuildLocation>
>  <ns0:BuildID></ns0:BuildID>
>  </ns0:GetBuildLocation>
>  </ns1:Body>
>  </SOAP-ENV:Envelope>
>  DEBUG:suds.client:headers = {'SOAPAction':
>  u'"http://www.qualcomm.com/QCT/QSWAT/SAWebService/GetBuildLocati...;,
>  'Content-Type': '
>  text/xml'}
>  DEBUG:suds.client:http succeeded:
>  <?xml version="1.0" encoding="utf-8"?><soap:Envelope
>  xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
>  xmlns:xsi="http://www.
>  w3.org/2001/XMLSchema-instance"
>
> xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body&g...
>
> <http://www.w3.org/2001/XMLSchema"><soap:Body><soap:Fault...
>  ode><faultstring>Server was unable to process request. ---&gt; Build ID
>  cannot be empty</faultstring><detail /></soap:Fault></soap
>  :Body></soap:Envelope>
>  When I look at the xml returned I sse the faultcode as soap:Server. Is
>  this a correct web fault xml item? Also, how do I get to the
>  <faultstring> area, if I can do this I could find out what the error is. 
Yes, this appears to be a valid web fault.  If the server is not returning http code = 
500, you will need to use 0.4.  In 0.4, suds will raise an exception even if the http code

= 200 if the <soap:Fault/> is present.  After you catch the exception, you can
inspect to 
see what happened:

except WebFault f:
   print 'code=%s, string=%s' % (f.fault.faultcode, f.fault.faultstring)

>  Thanks
>  Donald W. Long
>  Email: Donald.W.Long(a)thelongsfamily.com
>  Skype: Donald.W.Long
>
>  ------ Original Message ------
>  From: "Donald W. Long" <donald.w.long(a)gmail.com&gt;
>  To: suds(a)lists.fedoraproject.org
>  Sent: 5/26/2010 2:25:48 PM
>  Subject: Dealing with exceptions from the web services
> > Message: 3
> > Date: Tue, 25 May 2010 10:43:09 -0800
> > From: "Joshua J. Kugler" <joshua(a)eeinternet.com&gt;
> > Subject: Re: [Fedora-suds-list] Dealing with exceptions from the web
> > services
> > To: suds(a)lists.fedoraproject.org, "Donald W. Long"
> > <donald.w.long(a)gmail.com&gt;
> > Message-ID: <201005251043.09590.joshua(a)eeinternet.com&gt;
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > On Tuesday 25 May 2010, Donald W. Long elucidated thus:
> >> I found that if the service returns a string value and the service
> >> throws an exception i can look at the result and it will contain
> >> 'soap:Server', but if the service returns void then you can not tell
> >> if you have an error or not.
> >>
> >>
> >> But what I am really trying to figure out, is how do you see what
> >> exception the service has thrown.
> >>
> >> You may noticed that I am using the WindowsHttpAuthenticated, this is
> >> required for access to the server that is running the web services.
> >
> > If you are not seeing a suds.WebFault raised then the service is not
> > raising a SOAPFault, and thus is returning error information to you
> > other ways. If the service does not raise a SOAPFault on errors, then
> > you will have to wrap the call and raise an exception if an error
> > condition is returned.
> > I understand the above but we did a test with C#, below is some of the
> > code and we get a soap error.
> > public partial class _Default : System.Web.UI.page
> > {
> > protected void Page_load(object sender, EventArgs e)
> > {
> > SAWebServices ws = new SAWebService();
> > try
> > {
> > ws.GetBuildLocation(string.Empty);
> > }
> > catch (SoapException se)
> > {
> > Response.Write(se.Detail);
> > }
> > }
> > }
> > the above code will get a SoapException if an empty string is sent to
> > GetBuildLocation. The service is written in .NET ASP. From what I have
> > been told, Microsoft always converts the exception into a Soap
> > Exception. When we also use perl we get an exception for the client
> > code but not using python and suds. Should the SoapException be
> > something else?
> > We are at a loss on this one and not sure how to continue using suds
> > with Python. Given all other languages that we use, C# and perl we get
> > an exception from it. With Python and suds we only get a string that
> > says Soap:Server.
> > What type of exception should we throw for the web service, and what I
> > do not understand is given all these other languages and packages
> > work, what is the difference between suds and what they are doing.
> > Most of the developers in my area feel that suds is not handling
> > exceptions correctly, me, I am not sure, I am new at soap.
> > If you have any recommendations on what we should do then please let
> > us know. We would really like to move to Python and suds.
> > Have a nice day
> > Donald W. Long
> > Email: Donald.W.Long(a)thelongsfamily.com
> > Skype: Donald.W.Long
>
>
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