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annotate mercurial/hgweb/wsgicgi.py @ 2509:6350b01d173f

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merge with wsgi changes.
author Vadim Gelfer <vadim.gelfer@gmail.com>
date Tue, 27 Jun 2006 00:10:41 -0700
parents d0db3462d568
children 1120302009d7
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2506
d0db3462d568 This patch make several WSGI related alterations.
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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
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31 def write(data):
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32 if not headers_set:
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33 raise AssertionError("write() before start_response()")
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34
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35 elif not headers_sent:
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36 # Before the first output, send the stored headers
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37 status, response_headers = headers_sent[:] = headers_set
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38 sys.stdout.write('Status: %s\r\n' % status)
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39 for header in response_headers:
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40 sys.stdout.write('%s: %s\r\n' % header)
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41 sys.stdout.write('\r\n')
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42
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43 sys.stdout.write(data)
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44 sys.stdout.flush()
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45
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46 def start_response(status,response_headers,exc_info=None):
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47 if exc_info:
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48 try:
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49 if headers_sent:
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50 # Re-raise original exception if headers sent
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51 raise exc_info[0], exc_info[1], exc_info[2]
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52 finally:
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53 exc_info = None # avoid dangling circular ref
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54 elif headers_set:
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55 raise AssertionError("Headers already set!")
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56
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57 headers_set[:] = [status,response_headers]
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58 return write
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59
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60 result = application(environ, start_response)
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61 try:
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62 for data in result:
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63 if data: # don't send headers until body appears
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64 write(data)
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65 if not headers_sent:
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66 write('') # send headers now if body was empty
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67 finally:
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68 if hasattr(result,'close'):
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69 result.close()