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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 of the
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6 # GNU General Public License version 2, 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 from upmana.mercurial import util
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13
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14 def launch(application):
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15 util.set_binary(sys.stdin)
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16 util.set_binary(sys.stdout)
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17
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18 environ = dict(os.environ.iteritems())
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19 environ.setdefault('PATH_INFO', '')
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20 if '.cgi' in environ['PATH_INFO']:
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21 environ['PATH_INFO'] = environ['PATH_INFO'].split('.cgi', 1)[1]
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22
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23 environ['wsgi.input'] = sys.stdin
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24 environ['wsgi.errors'] = sys.stderr
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25 environ['wsgi.version'] = (1, 0)
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26 environ['wsgi.multithread'] = False
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27 environ['wsgi.multiprocess'] = True
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28 environ['wsgi.run_once'] = True
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29
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30 if environ.get('HTTPS','off').lower() in ('on','1','yes'):
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31 environ['wsgi.url_scheme'] = 'https'
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32 else:
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33 environ['wsgi.url_scheme'] = 'http'
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34
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35 headers_set = []
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36 headers_sent = []
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37 out = sys.stdout
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38
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39 def write(data):
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40 if not headers_set:
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41 raise AssertionError("write() before start_response()")
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42
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43 elif not headers_sent:
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44 # Before the first output, send the stored headers
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45 status, response_headers = headers_sent[:] = headers_set
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46 out.write('Status: %s\r\n' % status)
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47 for header in response_headers:
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48 out.write('%s: %s\r\n' % header)
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49 out.write('\r\n')
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50
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51 out.write(data)
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52 out.flush()
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53
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54 def start_response(status, response_headers, exc_info=None):
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55 if exc_info:
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56 try:
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57 if headers_sent:
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58 # Re-raise original exception if headers sent
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59 raise exc_info[0](exc_info[1], exc_info[2])
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60 finally:
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61 exc_info = None # avoid dangling circular ref
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62 elif headers_set:
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63 raise AssertionError("Headers already set!")
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64
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65 headers_set[:] = [status, response_headers]
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66 return write
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67
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68 content = application(environ, start_response)
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69 for chunk in content:
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70 write(chunk)
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