templater: factor out helper that renders named template as string
This is quite common in non-web templating, and **kwargs expansion is annoying
because of the unicode-ness of Python3.
# hgweb/wsgicgi.py - CGI->WSGI translator
#
# Copyright 2006 Eric Hopper <hopper@omnifarious.org>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
#
# This was originally copied from the public domain code at
# http://www.python.org/dev/peps/pep-0333/#the-server-gateway-side
from __future__ import absolute_import
from .. import (
encoding,
util,
)
from . import (
common,
)
def launch(application):
util.setbinary(util.stdin)
util.setbinary(util.stdout)
environ = dict(encoding.environ.iteritems())
environ.setdefault(r'PATH_INFO', '')
if environ.get(r'SERVER_SOFTWARE', r'').startswith(r'Microsoft-IIS'):
# IIS includes script_name in PATH_INFO
scriptname = environ[r'SCRIPT_NAME']
if environ[r'PATH_INFO'].startswith(scriptname):
environ[r'PATH_INFO'] = environ[r'PATH_INFO'][len(scriptname):]
stdin = util.stdin
if environ.get(r'HTTP_EXPECT', r'').lower() == r'100-continue':
stdin = common.continuereader(stdin, util.stdout.write)
environ[r'wsgi.input'] = stdin
environ[r'wsgi.errors'] = util.stderr
environ[r'wsgi.version'] = (1, 0)
environ[r'wsgi.multithread'] = False
environ[r'wsgi.multiprocess'] = True
environ[r'wsgi.run_once'] = True
if environ.get(r'HTTPS', r'off').lower() in (r'on', r'1', r'yes'):
environ[r'wsgi.url_scheme'] = r'https'
else:
environ[r'wsgi.url_scheme'] = r'http'
headers_set = []
headers_sent = []
out = util.stdout
def write(data):
if not headers_set:
raise AssertionError("write() before start_response()")
elif not headers_sent:
# Before the first output, send the stored headers
status, response_headers = headers_sent[:] = headers_set
out.write('Status: %s\r\n' % status)
for header in response_headers:
out.write('%s: %s\r\n' % header)
out.write('\r\n')
out.write(data)
out.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
elif headers_set:
raise AssertionError("Headers already set!")
headers_set[:] = [status, response_headers]
return write
content = application(environ, start_response)
try:
for chunk in content:
write(chunk)
if not headers_sent:
write('') # send headers now if body was empty
finally:
getattr(content, 'close', lambda: None)()