Carlos Blé & Associates

Python web services with SoapLib

16 May by 11

I got surprised when I found that there was no Web Services implementation in the Python standard lib but fortunately there is a nice project called SoapLib that is open source and implements web services. SoapLib generates the WSDL for your web service and it is supposed to be ready to consume with Java or .Net.

Service code sample:

 
from soaplib.wsgi_soap import SimpleWSGISoapApp
from soaplib.wsgi_soap import SimpleWSGISoapApp
from soaplib.service import soapmethod
from soaplib.serializers.primitive import *
from cherrypy.wsgiserver import CherryPyWSGIServer
 
class ServersInfoService(SimpleWSGISoapApp):
 
    @soapmethod(_returns=Array(String))
    def getServersList(self):
        results = []
        for serverValues in Server.objects.values():
            results.append(str(serverValues))
        return results
 
 
if __name__=='__main__':
    try:
        server = CherryPyWSGIServer(('localhost' ,17777), ServersInfoService())
        # enable the next two lines if you want HTTPS
        #server.ssl_private_key = '/fullpath/file.key'
        #server.ssl_certificate = '/fullpath/file.pem'
        server.start()
    except KeyboardInterrupt:
        server.stop()
 

Client code sample:

 
from soaplib.client import make_service_client
import unittest
import os
import re
 
class infoServicesTests(unittest.TestCase):
 
    def setUp(self):
        # https=True enables HTTPS
        self.clientInfoService = make_service_client('localhost:17777/', ServersInfoService(), https=True)
 
    def testGetServiceWSDL(self):
        # this generates the WSDL:
        print self.clientInfoService.server.wsdl('')
 
    def testGetServersList(self):
        servers = self.clientInfoService.getServersList()
        for tuple in servers:
            print "Servidor:" + tuple
 

The HTTPS client is still not implemented in SoapLib as far as I know. I've just sent a patch to the SoapLib group that is working for me.
The WSDL generation is made with client.server.wsdl('').
I'll tell you if we can consume the web service from Java successfully.

The Python syntax highlight has been done with CodeHighlighter plugin.