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# hgweb/wsgicgi.py - CGI->WSGI translator
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#
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# Copyright 2006 Eric Hopper <hopper@omnifarious.org>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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#
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# This was originally copied from the public domain code at
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# http://www.python.org/dev/peps/pep-0333/#the-server-gateway-side
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import os, sys
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from mercurial import util
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from mercurial.hgweb import common
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def launch(application):
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util.setbinary(sys.stdin)
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util.setbinary(sys.stdout)
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environ = dict(os.environ.iteritems())
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environ.setdefault('PATH_INFO', '')
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if environ.get('SERVER_SOFTWARE', '').startswith('Microsoft-IIS'):
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# IIS includes script_name in PATH_INFO
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scriptname = environ['SCRIPT_NAME']
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if environ['PATH_INFO'].startswith(scriptname):
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environ['PATH_INFO'] = environ['PATH_INFO'][len(scriptname):]
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stdin = sys.stdin
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if environ.get('HTTP_EXPECT', '').lower() == '100-continue':
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stdin = common.continuereader(stdin, sys.stdout.write)
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environ['wsgi.input'] = stdin
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environ['wsgi.errors'] = sys.stderr
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environ['wsgi.version'] = (1, 0)
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environ['wsgi.multithread'] = False
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environ['wsgi.multiprocess'] = True
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environ['wsgi.run_once'] = True
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if environ.get('HTTPS', 'off').lower() in ('on', '1', 'yes'):
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environ['wsgi.url_scheme'] = 'https'
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else:
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environ['wsgi.url_scheme'] = 'http'
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headers_set = []
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headers_sent = []
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out = sys.stdout
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def write(data):
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if not headers_set:
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raise AssertionError("write() before start_response()")
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elif not headers_sent:
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# Before the first output, send the stored headers
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status, response_headers = headers_sent[:] = headers_set
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out.write('Status: %s\r\n' % status)
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for header in response_headers:
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out.write('%s: %s\r\n' % header)
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out.write('\r\n')
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out.write(data)
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out.flush()
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def start_response(status, response_headers, exc_info=None):
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if exc_info:
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try:
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if headers_sent:
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# Re-raise original exception if headers sent
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raise exc_info[0](exc_info[1], exc_info[2])
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finally:
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exc_info = None # avoid dangling circular ref
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elif headers_set:
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raise AssertionError("Headers already set!")
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headers_set[:] = [status, response_headers]
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return write
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content = application(environ, start_response)
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try:
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for chunk in content:
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write(chunk)
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if not headers_sent:
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write('') # send headers now if body was empty
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finally:
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getattr(content, 'close', lambda : None)()
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