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# Copyright (c) 2006 Allan Saddi <allan@saddi.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $Id$
__author__ = 'Allan Saddi <allan@saddi.com>'
__version__ = '$Revision$'
import select
import struct
import socket
import errno
import types
__all__ = ['SCGIApp']
def encodeNetstring(s):
return ''.join([str(len(s)), ':', s, ','])
class SCGIApp(object):
def __init__(self, connect=None, host=None, port=None,
filterEnviron=True):
if host is not None:
assert port is not None
connect=(host, port)
assert connect is not None
self._connect = connect
self._filterEnviron = filterEnviron
def __call__(self, environ, start_response):
sock = self._getConnection()
outfile = sock.makefile('w')
infile = sock.makefile('r')
sock.close()
# Filter WSGI environ and send as request headers
if self._filterEnviron:
headers = self._defaultFilterEnviron(environ)
else:
headers = self._lightFilterEnviron(environ)
# TODO: Anything not from environ that needs to be sent also?
content_length = int(environ.get('CONTENT_LENGTH') or 0)
if headers.has_key('CONTENT_LENGTH'):
del headers['CONTENT_LENGTH']
headers_out = ['CONTENT_LENGTH', str(content_length), 'SCGI', '1']
for k,v in headers.items():
headers_out.append(k)
headers_out.append(v)
headers_out.append('') # For trailing NUL
outfile.write(encodeNetstring('\x00'.join(headers_out)))
# Transfer wsgi.input to outfile
while True:
chunk_size = min(content_length, 4096)
s = environ['wsgi.input'].read(chunk_size)
content_length -= len(s)
outfile.write(s)
if not s: break
outfile.close()
# Read result from SCGI server
result = []
while True:
buf = infile.read(4096)
if not buf: break
result.append(buf)
infile.close()
result = ''.join(result)
# Parse response headers
status = '200 OK'
headers = []
pos = 0
while True:
eolpos = result.find('\n', pos)
if eolpos < 0: break
line = result[pos:eolpos-1]
pos = eolpos + 1
# strip in case of CR. NB: This will also strip other
# whitespace...
line = line.strip()
# Empty line signifies end of headers
if not line: break
# TODO: Better error handling
header, value = line.split(':', 1)
header = header.strip().lower()
value = value.strip()
if header == 'status':
# Special handling of Status header
status = value
if status.find(' ') < 0:
# Append a dummy reason phrase if one was not provided
status += ' SCGIApp'
else:
headers.append((header, value))
result = result[pos:]
# Set WSGI status, headers, and return result.
start_response(status, headers)
return [result]
def _getConnection(self):
if isinstance(self._connect, types.StringTypes):
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
sock.connect(self._connect)
elif hasattr(socket, 'create_connection'):
sock = socket.create_connection(self._connect)
else:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect(self._connect)
return sock
_environPrefixes = ['SERVER_', 'HTTP_', 'REQUEST_', 'REMOTE_', 'PATH_',
'CONTENT_']
_environCopies = ['SCRIPT_NAME', 'QUERY_STRING', 'AUTH_TYPE']
_environRenames = {}
def _defaultFilterEnviron(self, environ):
result = {}
for n in environ.keys():
for p in self._environPrefixes:
if n.startswith(p):
result[n] = environ[n]
if n in self._environCopies:
result[n] = environ[n]
if n in self._environRenames:
result[self._environRenames[n]] = environ[n]
return result
def _lightFilterEnviron(self, environ):
result = {}
for n in environ.keys():
if n.upper() == n:
result[n] = environ[n]
return result
if __name__ == '__main__':
from flup.server.ajp import WSGIServer
app = SCGIApp(connect=('localhost', 4000))
#import paste.lint
#app = paste.lint.middleware(app)
WSGIServer(app).run()
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