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"""
cgi WSGI server
===============
Usage
-----
The CGI script is the configuration and glue for this server.
Typically you will write a CGI script like::
#!/usr/bin/env python
from paste.cgiserver import run_with_cgi
# Assuming app is your WSGI application object...
from myapplication import app
run_with_cgi(app)
"""
import os, sys
def run_with_cgi(application,
use_cgitb=True,
redirect_stdout=False):
stdout = sys.stdout
if use_cgitb:
import cgitb
cgitb.enable()
environ = dict(os.environ)
environ['wsgi.input'] = sys.stdin
environ['wsgi.errors'] = sys.stderr
environ['wsgi.version'] = (1, 0)
environ['wsgi.multithread'] = False
environ['wsgi.multiprocess'] = True
environ['wsgi.run_once'] = True
if os.environ.get('HTTPS', 'off').lower() in ('on', '1'):
environ['wsgi.url_scheme'] = 'https'
else:
environ['wsgi.url_scheme'] = 'http'
if redirect_stdout:
sys.stdout = sys.stderr
headers_set = []
headers_sent = []
result = None
def write(data):
assert headers_set, "write() before start_response()"
if not headers_sent:
# Before the first output, send the stored headers
status, response_headers = headers_sent[:] = headers_set
# See if Content-Length is given.
found = False
for name, value in response_headers:
if name.lower() == 'content-length':
found = True
break
# If not given, try to deduce it if the iterator implements
# __len__ and is of length 1. (data will be result[0] in this
# case.)
if not found and result is not None:
try:
if len(result) == 1:
response_headers.append(('Content-Length',
str(len(data))))
except:
pass
stdout.write('Status: %s\r\n' % status)
for header in response_headers:
stdout.write('%s: %s\r\n' % header)
stdout.write('\r\n')
stdout.write(data)
stdout.flush()
def start_response(status, response_headers, exc_info=None):
if exc_info:
try:
if headers_sent:
# Re-raise original exception if headers sent
raise exc_info[0], exc_info[1], exc_info[2]
finally:
exc_info = None # avoid dangling circular ref
else:
assert not headers_set, "Headers already set!"
headers_set[:] = [status, response_headers]
return write
result = application(environ, start_response)
try:
for data in result:
if data: # don't send headers until body appears
write(data)
if not headers_sent:
write('') # send headers now if body was empty
finally:
if hasattr(result, 'close'):
result.close()
if __name__ == '__main__':
def myapp(environ, start_response):
start_response('200 OK', [('Content-Type', 'text/plain')])
return ['Hello World!\n']
run_with_cgi(myapp)
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