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annotate mercurial/hgweb/wsgicgi.py @ 2568:52ce0d6bc375

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HTTPS: fix python2.3, persistent connections, don't explode if SSL is not available The urllib2 differences between python 2.3 and 2.4 are hidden by using keepalive.py, which also gives us support for persistent connections. Support for HTTPS is enabled only if there's a HTTPSHandler class in urllib2. It's not possible to have separate classes as handlers for HTTP and HTTPS: to support persistent HTTPS connections, we need a class that inherits from both keepalive.HTTPHandler and urllib2.HTTPSHandler. If we try to pass (an instance of) this class and (an instance of) the httphandler class to urllib2.build_opener, this function ends up getting confused, since both classes are subclasses of the HTTPHandler default handler, and raises an exception.
author Alexis S. L. Carvalho <alexis@cecm.usp.br>
date Thu, 06 Jul 2006 03:14:55 -0300
parents 1120302009d7
children eb0b4a2d70a9
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1 # hgweb/wsgicgi.py - CGI->WSGI translator
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2 #
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3 # Copyright 2006 Eric Hopper <hopper@omnifarious.org>
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4 #
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5 # This software may be used and distributed according to the terms
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6 # of the GNU General Public License, incorporated herein by reference.
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7 #
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8 # This was originally copied from the public domain code at
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9 # http://www.python.org/dev/peps/pep-0333/#the-server-gateway-side
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10
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11 import os, sys
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12
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13 def launch(application):
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14
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15 environ = dict(os.environ.items())
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16 environ['wsgi.input'] = sys.stdin
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17 environ['wsgi.errors'] = sys.stderr
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18 environ['wsgi.version'] = (1,0)
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19 environ['wsgi.multithread'] = False
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20 environ['wsgi.multiprocess'] = True
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21 environ['wsgi.run_once'] = True
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22
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23 if environ.get('HTTPS','off') in ('on','1'):
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24 environ['wsgi.url_scheme'] = 'https'
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25 else:
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26 environ['wsgi.url_scheme'] = 'http'
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27
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28 headers_set = []
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29 headers_sent = []
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30 out = sys.stdout
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31
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32 def write(data):
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33 if not headers_set:
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34 raise AssertionError("write() before start_response()")
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35
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36 elif not headers_sent:
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37 # Before the first output, send the stored headers
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38 status, response_headers = headers_sent[:] = headers_set
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39 out.write('Status: %s\r\n' % status)
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40 for header in response_headers:
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41 out.write('%s: %s\r\n' % header)
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42 out.write('\r\n')
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43
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44 out.write(data)
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45 out.flush()
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46
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47 def start_response(status,response_headers,exc_info=None):
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48 if exc_info:
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49 try:
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50 if headers_sent:
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51 # Re-raise original exception if headers sent
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52 raise exc_info[0], exc_info[1], exc_info[2]
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53 finally:
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54 exc_info = None # avoid dangling circular ref
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55 elif headers_set:
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56 raise AssertionError("Headers already set!")
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57
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58 headers_set[:] = [status,response_headers]
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59 return write
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60
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61 result = application(environ, start_response)
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62 try:
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63 for data in result:
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64 if data: # don't send headers until body appears
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65 write(data)
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66 if not headers_sent:
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67 write('') # send headers now if body was empty
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68 finally:
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69 if hasattr(result,'close'):
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70 result.close()