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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
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# of the GNU General Public License, incorporated herein by reference.
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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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def launch(application):
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environ = dict(os.environ.items())
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environ['wsgi.input'] = sys.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') in ('on','1'):
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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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result = application(environ, start_response)
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try:
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for data in result:
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if data: # don't send headers until body appears
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write(data)
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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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if hasattr(result,'close'):
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result.close()
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