django1/django/core/servers/basehttp.py

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"""
HTTP server that implements the Python WSGI protocol (PEP 333, rev 1.21).
Based on wsgiref.simple_server which is part of the standard library since 2.5.
This is a simple server for use in testing or debugging Django apps. It hasn't
been reviewed for security issues. DON'T USE IT FOR PRODUCTION USE!
"""
import os
import socket
import sys
import traceback
try:
from urllib.parse import unquote, urljoin
except ImportError: # Python 2
from urllib import unquote
from urlparse import urljoin
from django.utils.six.moves import socketserver
from wsgiref import simple_server
from wsgiref.util import FileWrapper # for backwards compatibility
import django
from django.core.exceptions import ImproperlyConfigured
from django.core.management.color import color_style
from django.core.wsgi import get_wsgi_application
from django.utils.importlib import import_module
__all__ = ['WSGIServer', 'WSGIRequestHandler']
def get_internal_wsgi_application():
"""
Loads and returns the WSGI application as configured by the user in
``settings.WSGI_APPLICATION``. With the default ``startproject`` layout,
this will be the ``application`` object in ``projectname/wsgi.py``.
This function, and the ``WSGI_APPLICATION`` setting itself, are only useful
for Django's internal servers (runserver, runfcgi); external WSGI servers
should just be configured to point to the correct application object
directly.
If settings.WSGI_APPLICATION is not set (is ``None``), we just return
whatever ``django.core.wsgi.get_wsgi_application`` returns.
"""
from django.conf import settings
app_path = getattr(settings, 'WSGI_APPLICATION')
if app_path is None:
return get_wsgi_application()
module_name, attr = app_path.rsplit('.', 1)
try:
mod = import_module(module_name)
except ImportError as e:
raise ImproperlyConfigured(
"WSGI application '%s' could not be loaded; "
"could not import module '%s': %s" % (app_path, module_name, e))
try:
app = getattr(mod, attr)
except AttributeError as e:
raise ImproperlyConfigured(
"WSGI application '%s' could not be loaded; "
"can't find '%s' in module '%s': %s"
% (app_path, attr, module_name, e))
return app
class WSGIServerException(Exception):
pass
class ServerHandler(simple_server.ServerHandler, object):
error_status = "500 INTERNAL SERVER ERROR"
def write(self, data):
"""'write()' callable as specified by PEP 333"""
assert isinstance(data, str), "write() argument must be string"
if not self.status:
raise AssertionError("write() before start_response()")
elif not self.headers_sent:
# Before the first output, send the stored headers
self.bytes_sent = len(data) # make sure we know content-length
self.send_headers()
else:
self.bytes_sent += len(data)
# XXX check Content-Length and truncate if too many bytes written?
# If data is too large, socket will choke, so write chunks no larger
# than 32MB at a time.
length = len(data)
if length > 33554432:
offset = 0
while offset < length:
chunk_size = min(33554432, length)
self._write(data[offset:offset+chunk_size])
self._flush()
offset += chunk_size
else:
self._write(data)
self._flush()
def error_output(self, environ, start_response):
super(ServerHandler, self).error_output(environ, start_response)
return ['\n'.join(traceback.format_exception(*sys.exc_info()))]
class WSGIServer(simple_server.WSGIServer, object):
"""BaseHTTPServer that implements the Python WSGI protocol"""
def __init__(self, *args, **kwargs):
if kwargs.pop('ipv6', False):
self.address_family = socket.AF_INET6
super(WSGIServer, self).__init__(*args, **kwargs)
def server_bind(self):
"""Override server_bind to store the server name."""
try:
super(WSGIServer, self).server_bind()
except Exception as e:
raise WSGIServerException(e)
self.setup_environ()
class WSGIRequestHandler(simple_server.WSGIRequestHandler, object):
def __init__(self, *args, **kwargs):
from django.conf import settings
self.admin_static_prefix = urljoin(settings.STATIC_URL, 'admin/')
# We set self.path to avoid crashes in log_message() on unsupported
# requests (like "OPTIONS").
self.path = ''
self.style = color_style()
super(WSGIRequestHandler, self).__init__(*args, **kwargs)
def get_environ(self):
env = self.server.base_environ.copy()
env['SERVER_PROTOCOL'] = self.request_version
env['REQUEST_METHOD'] = self.command
if '?' in self.path:
path,query = self.path.split('?',1)
else:
path,query = self.path,''
env['PATH_INFO'] = unquote(path)
env['QUERY_STRING'] = query
env['REMOTE_ADDR'] = self.client_address[0]
env['CONTENT_TYPE'] = self.headers.get('content-type', 'text/plain')
length = self.headers.get('content-length')
if length:
env['CONTENT_LENGTH'] = length
for key, value in self.headers.items():
key = key.replace('-','_').upper()
value = value.strip()
if key in env:
# Skip content length, type, etc.
continue
if 'HTTP_' + key in env:
# Comma-separate multiple headers
env['HTTP_' + key] += ',' + value
else:
env['HTTP_' + key] = value
return env
def log_message(self, format, *args):
# Don't bother logging requests for admin images or the favicon.
if (self.path.startswith(self.admin_static_prefix)
or self.path == '/favicon.ico'):
return
msg = "[%s] %s\n" % (self.log_date_time_string(), format % args)
# Utilize terminal colors, if available
if args[1][0] == '2':
# Put 2XX first, since it should be the common case
msg = self.style.HTTP_SUCCESS(msg)
elif args[1][0] == '1':
msg = self.style.HTTP_INFO(msg)
elif args[1] == '304':
msg = self.style.HTTP_NOT_MODIFIED(msg)
elif args[1][0] == '3':
msg = self.style.HTTP_REDIRECT(msg)
elif args[1] == '404':
msg = self.style.HTTP_NOT_FOUND(msg)
elif args[1][0] == '4':
msg = self.style.HTTP_BAD_REQUEST(msg)
else:
# Any 5XX, or any other response
msg = self.style.HTTP_SERVER_ERROR(msg)
sys.stderr.write(msg)
def run(addr, port, wsgi_handler, ipv6=False, threading=False):
server_address = (addr, port)
if threading:
httpd_cls = type('WSGIServer', (socketserver.ThreadingMixIn, WSGIServer), {})
else:
httpd_cls = WSGIServer
httpd = httpd_cls(server_address, WSGIRequestHandler, ipv6=ipv6)
httpd.set_app(wsgi_handler)
httpd.serve_forever()