New subject: [Soap-Python] some questions about soaplib

Tuesday, 6 December 2011

Hi, all:

Recently, I have been do something about python webservice. Above all the
methods of python webservice, soaplib is welcome and popular. When using
soaplib, some problems puzzled me as follows.

porlbem 1: soaplib provide client-side or not？
Usually, I use soaplib as follows:

# file-name: soaplib_server.py:
# -*- coding:utf-8 -*-

from soaplib.wsgi_soap import SimpleWSGISoapApp
from soaplib.service import soapmethod
from soaplib.serializers.clazz import ClassSerializer
from soaplib.serializers.primitive import String, Integer, Array, DateTime

class SMS(ClassSerializer):
    class types:
        mobile = String
        content = String

class SMSService(SimpleWSGISoapApp):
    @soapmethod(String, _returns=Array(SMS))
    def get_sms(self,id):
        sms_lst = []
        sms = SMS()
        sms.mobile = "13011292217"
        sms.content = "hi, it's a test!"
        sms_lst.append(sms)
        return sms_lst

def make_client():
    from soaplib.client import make_service_client
    client = make_service_client('http://localhost:7789/' ,SMSService())
    return client

if __name__=='__main__':
    try:
        from wsgiref.simple_server import make_server
        server = make_server('localhost', 7789,SMSService())
        server.serve_forever()
    except ImportError:
        print "Error: example server code requires Python >= 2.5"

#file-name: suds_client.py
import suds

def test_soaplib3():
import logging
    logging.basicConfig(level=logging.ERROR)

    url = "http://localhost:7789/?wsdl"
    client = suds.client.Client(url,cache=None)
    print 'client', client
    output = client.service.get_sms('jia')
    print 'output', output

#NOTE: Certainly, it's okay. Below is the output:

#output:
client
Suds ( https://fedorahosted.org/suds/ )  version: 0.3.7 GA  build:
R580-20091016

Service ( SMSService ) tns="SMSService.SMSService"
   Prefixes (1)
      ns0 = "SMSService.SMSService"
   Ports (1):
      (SMSService)
         Methods (1):
            get_sms(xs:string id, )
         Types (4):
            SMS
            SMSArray
            get_sms
            get_smsResponse

output (SMSArray){
   _type = "tns:SMSArray"
   SMS[] =
      (SMS){
         content = "hi, it's a test!"
         mobile = "13011292217"
      },
 }

#NOTE: do you find the "def make_client():" in the server-side ? It's no
use when we use suds_client.py.  Now, let me talk the problem:
I think soaplib is only a server-side and without client, you also can find
the words as follows in "http://soaplib.github.com/soaplib/2_0/":
"Soaplib is an easy to use Python library for publishing SOAP web services
using WSDL 1.1 standard, and answering SOAP 1.1 requests. With a very small
amount of code, soaplib allows you to write a useful web service and deploy
it as a WSGI application. (Non-WSGI scenarios are also supported.)"
Most of scenes,  soaplib make as server and suds did for client. They can
work together well.
In a web page, I found someone use client by soaplib, the client can be
write as follows:

# file-name: soaplib_client.py
# -*- coding:utf-8 -*-

from soaplib_server3 import SMSService
from soaplib_server3 import make_client
import lxml.etree as et

a = make_client()
ret = a.get_sms('jia')
print 'ret:', ret
print 'type of ret:', type(ret)
for i,r in enumerate(ret):
    print 'i:',i, r.mobile, r.content

#output:
ret: [<soaplib_server3.SMS object at 0x8ecf7ec>]
type of ret: <type 'list'>
i: 0 13011292217 hi, it's a test!

#NOTE: now, the questions are :
1: Whether soaplib can provide client?
2: If the answer for question 1 is okay, then the second question is : how
to provide a webservice client using soaplib? Is the method "client =
make_service_client('http://localhost:7789/' ,SMSService())" which is be
used in my soaplib_serve.py?
3: if you agree that soaplib can make as websevice client-side, I would
like to ask: The client relays so heavily on sever-side, in the
client-side, it requests some classes or modules in server side are
imported. If we use soaplib-client to invoke a remote server(it may be
developed in Java, C#, php or other language, or python which is not in the
some local), how we get the class in server?

I do not whether i speak my question clearly. In actual fact, what I eager
to know is how to provide a client-side using soaplib if soaplib can.

part 2:  Is there someone find it spend much time and not stable to invoke
soaplib using suds as follows.
#NOTE: the code can also be found in "
http://soaplib.github.com/soaplib/2_0/pages/helloworld.html"
# soaplib_server.py
import soaplib
from soaplib.core.service import soap
from soaplib.core.service import rpc, DefinitionBase
from soaplib.core.model.primitive import String, Integer
from soaplib.core.server import wsgi
from soaplib.core.model.clazz import Array
from soaplib.core import Application
class HelloWorldService(DefinitionBase):

    @soap(String,Integer,_returns=Array(String))
    def say_hello(self,name,times):
        results = []
        for i in range(0,times):
            results.append('Hello, %s'%name)
        return results

if __name__=='__main__':
    print 'server begin running...'
    try:
        from wsgiref.simple_server import make_server
        soap_application = Application([HelloWorldService], 'tns')

        wsgi_application = wsgi.Application(soap_application)
        server = make_server('localhost', 7789, wsgi_application)
        server.serve_forever()
    except ImportError:
        print "Error: example server code requires Python >= 2.5"

# suds.py
import suds
def test_soaplib():

    url = "http://localhost:7789/?wsdl"
    client = suds.client.Client(url,cache=None)
    print 'client', client
    output = client.service.say_hello('jia',3)
    print 'output', output

when you invoke sus.py , it takes much time and a long time later returns
the right result
”output (stringArray){
   string[] =
      "Hello, jia",
      "Hello, jia",
      "Hello, jia",
 }
“
or the exception below(it‘s not present exceptions as follows. most of time
it return the result successfully after 2 or 3 minutes).

Traceback (most recent call last):
  File "suds_client.py", line 774, in <module>
    test_soaplib()
  File "suds_client.py", line 627, in test_soaplib
    client = suds.client.Client(url,cache=None)
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/client.py",
line 109, in __init__
    self.wsdl = Definitions(url, options)
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/wsdl.py",
line 194, in __init__
    self.build_schema()
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/wsdl.py",
line 255, in build_schema
    self.schema = container.load()
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/xsd/schema.py",
line 90, in load
    child.open_imports()
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/xsd/schema.py",
line 277, in open_imports
    imported = imp.open()
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/xsd/sxbasic.py",
line 608, in open
    result = self.download()
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/xsd/sxbasic.py",
line 628, in download
    return self.schema.instance(root, url)
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/xsd/schema.py",
line 367, in instance
    return Schema(root, baseurl, self.options)
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/xsd/schema.py",
line 200, in __init__
    self.open_imports()
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/xsd/schema.py",
line 277, in open_imports
    imported = imp.open()
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/xsd/sxbasic.py",
line 608, in open
    result = self.download()
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/xsd/sxbasic.py",
line 626, in download
    root = Parser(transport).parse(url=url).root()
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/sax/parser.py",
line 133, in parse
    fp = self.transport.open(Request(url))
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/transport/https.py",
line 69, in open
    return  HttpTransport.open(self, request)
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/transport/http.py",
line 69, in open
    fp = self.__open(u2request)
  File
"/usr/local/lib/python2.6/dist-packages/suds-0.3.7-py2.6.egg/suds/transport/http.py",
line 107, in __open
    return self.urlopener.open(u2request)
  File "/usr/lib/python2.6/urllib2.py", line 391, in open
    response = self._open(req, data)
  File "/usr/lib/python2.6/urllib2.py", line 409, in _open
    '_open', req)
  File "/usr/lib/python2.6/urllib2.py", line 369, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.6/urllib2.py", line 1161, in http_open
    return self.do_open(httplib.HTTPConnection, req)
  File "/usr/lib/python2.6/urllib2.py", line 1134, in do_open
    r = h.getresponse()
  File "/usr/lib/python2.6/httplib.py", line 986, in getresponse
    response.begin()
  File "/usr/lib/python2.6/httplib.py", line 391, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python2.6/httplib.py", line 355, in _read_status
    raise BadStatusLine(line)

# okay, the problem is why sometimes the client return the exception and
most of time return the correct results some minutes later?

Thanks for your time and concentration. Any relay is welcome.

-- Jia Xiaolei

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some questions about soaplib