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Python Web 服务开发人员: 三股力量:Python、Web 服务和 XSLT

 2008-09-30 13:02:15 来源:WEB开发网   
核心提示: 通常在 Web 服务本身所在的主机上提供该服务人性化的 WSDL 描述是很方便的, 清单 6是 清单 2的变体,Python Web 服务开发人员: 三股力量:Python、Web 服务和 XSLT(6),它也完成这一任务,它实际上提供三种功能: 对于端口 9000 上的 GET 请求:提

通常在 Web 服务本身所在的主机上提供该服务人性化的 WSDL 描述是很方便的。 清单 6是 清单 2的变体,它也完成这一任务。它实际上提供三种功能:

对于端口 9000 上的 GET 请求:提供该 Web 服务调用消息的易于理解的描述

对于端口 8888 上的 GET 请求:提供未经处理的 WSDL 文件

对于端口 8888 上的 POST 请求:执行 SOAP 请求。

清单 6. 清单 2 的变体

#HTTP Listener code for SOAP server
import BaseHTTPServer
#The processor class is the core of the XSLT API
from Ft.Xml.Xslt import Processor
#4XSLT uses an InputSource system for reading XML
from Ft.Xml import InputSource
SOAP_IMPL_FILE = "add.xsl"
WSDL_FILE = "listing4.xml"
HTML_VIEW_TRANSFORM = "listing5.xslt"
class KafkaSoapHandler(BaseHTTPServer.BaseHTTPRequestHandler):
  def init(cls):
    from Ft.Lib import Uri
    #Set up a processor instance to use
    cls.processor = Processor.Processor()
    #Load it with add.xsl
    add_uri = Uri.OsPathToUri(SOAP_IMPL_FILE, attemptAbsolute=1)
    transform = InputSource.DefaultFactory.fromUri(add_uri)
    cls.processor.appendStylesheet(transform)
    #Now the processor is prepped with a transform and can be used
    #over and over for the same transform
    #Prep for WSDL requests
    cls.wsdl = open(WSDL_FILE).read()
    return
  #Make init() a static method of the class
  init = classmethod(init)
  def do_POST(self):
    clen = self.headers.getheader('content-length')
    if clen:
      clen = int(clen)
    else:
      print 'POST ERROR: missing content-length'
      return
    if self.path != '/add':
      self.send_error(404)
    input_body = self.rfile.read(clen)
    #input_body is the request SOAP envelope and contents
    response_body = self._run_through_kafka(input_body)
    #response_body is the response SOAP envelope and contents
    _send_response(self, 200, 'OK', response_body)
    return
  def do_GET(self):
    #response_body is the WSDL file
    _send_response(self, 200, 'OK', self.wsdl)
    return
  
  def _run_through_kafka(self, body):
    #In 4Suite all InputSources have base URIs in case they refer to
    #other URIs in some way and resolution is required.
    #The SOAP messages will not have any such URI references,
    #So use a dummy base URI
    source = InputSource.DefaultFactory.fromString(body, "urn:dummy")
    response = self.processor.run(source)
    return response
class HtmlHandler(BaseHTTPServer.BaseHTTPRequestHandler):
  def init(cls):
    from Ft.Lib import Uri
    #Perform the transform once and store the result
    processor = Processor.Processor()
    html_desc_uri = Uri.OsPathToUri(HTML_VIEW_TRANSFORM,
                    attemptAbsolute=1)
    transform = InputSource.DefaultFactory.fromUri(html_desc_uri)
    processor.appendStylesheet(transform)
    wsdl_uri = Uri.OsPathToUri(WSDL_FILE, attemptAbsolute=1)
    source = InputSource.DefaultFactory.fromUri(wsdl_uri)
    cls.html_desc = processor.run(source)
    return
  #Make init() a static class method
  init = classmethod(init)
  def do_GET(self):
    #response_body is the WSDL file
    _send_response(self, 200, 'OK', self.html_desc)
    return
#Turn _send_response into a global function
#for sharing between the classes
def _send_response(handler, code, msg, body):
    #Prepare a normal response
    handler.send_response(200, 'OK')
    #Send standard HTP headers
    handler.send_header('Content-type', 'text/html; charset=utf-8')
    handler.send_header("Connection", "close")
    handler.send_header("Accept-Ranges", "bytes")
    handler.send_header('Content-length', len(body)-1)
    handler.end_headers()
    #Send the response prepared by the SOAP end point
    handler.wfile.write(body)
    return
def soap_listener_function():
  listen_on_port = 8888
  #Set up to run on local machine
  server_address = ('127.0.0.1', listen_on_port)
  KafkaSoapHandler.init()
  httpd = BaseHTTPServer.HTTPServer(server_address, KafkaSoapHandler)
  print "Listening for GET and POST on port", listen_on_port
  #Go into a the main event loop
  httpd.serve_forever()
def html_listener_function():
  listen_on_port = 9000
  #Set up to run on local machine
  server_address = ('127.0.0.1', listen_on_port)
  HtmlHandler.init()
  httpd = BaseHTTPServer.HTTPServer(server_address, HtmlHandler)
  print "Listening for GET on port", listen_on_port
  #Go into a the main event loop
  httpd.serve_forever()
  return
import time
from threading import Thread
soap_thread = Thread(None, soap_listener_function)
html_thread = Thread(None, html_listener_function)
soap_thread.start()
#Pause before spawning the next thread
time.sleep(1)
html_thread.start()

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