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# Copyright (c) 2009-2010 Denis Bilenko. See LICENSE for details.
import sys
import traceback
from urllib import unquote
from datetime import datetime
socket = __import__('socket')
import gevent
from gevent.http import HTTPServer
__all__ = ['WSGIServer',
'WSGIHandler']
class buffer_proxy(object):
def __init__(self, obj):
self._obj = obj
def __getattr__(self, item):
assert item != '_obj'
return getattr(self._obj, item)
def __iter__(self):
while len(self._obj):
yield self._obj.readline()
class WSGIHandler(object):
def __init__(self, request):
self.request = request
self.code = None
self.reason = None
self.headers = None
self.data = []
def start_response(self, status, headers, exc_info=None):
if not exc_info:
assert self.reason is None, 'start_response was already called'
else:
self.data = []
code, self.reason = status.split(' ', 1)
self.code = int(code)
self.headers = headers
return self.write
def write(self, data):
self.data.append(data)
def end(self, env):
assert self.headers is not None, 'Application did not call start_response'
has_content_length = False
for header, value in self.headers:
self.request.add_output_header(header, str(value))
if header == 'Content-Length':
has_content_length = True
data = ''.join(self.data)
if not has_content_length:
self.request.add_output_header('Content-Length', str(len(data)))
# QQQ work around bug in libevent 2.0.2 (and probably in older)
if (self.request.find_input_header('Transfer-Encoding') or '').lower() == 'chunked':
# if input is chunked, libevent assumes output chunked as well regardless
# of presence of 'Content-Length'
self.request.remove_output_header('Content-Length')
# QQQ end of work around
# QQQ when this is fixed, add version guard
SERVER_SOFTWARE = env.get('SERVER_SOFTWARE')
if SERVER_SOFTWARE and not self.request.find_output_header('Server'):
self.request.add_output_header('Server', SERVER_SOFTWARE)
self.send_reply(self.code, self.reason, data)
def send_reply(self, code, reason, data):
self.request.send_reply(code, reason, data)
self.log_request(len(data))
def format_request(self, length='-'):
req = self.request
referer = req.find_input_header('Referer') or '-'
agent = req.find_input_header('User-Agent') or '-'
# QQQ fix datetime format
now = datetime.now().replace(microsecond=0)
args = (req.remote_host, now, req.typestr, req.uri,
req.major, req.minor, req.response_code, length, referer, agent)
return '%s - - [%s] "%s %s HTTP/%s.%s" %s %s "%s" "%s"' % args
def log_request(self, *args):
print self.format_request(*args)
def prepare_env(self, req, server):
env = server.base_env.copy()
if '?' in req.uri:
path, query = req.uri.split('?', 1)
else:
path, query = req.uri, ''
path = unquote(path)
env.update({'REQUEST_METHOD': req.typestr,
'PATH_INFO': path,
'QUERY_STRING': query,
'SERVER_PROTOCOL': 'HTTP/%d.%d' % req.version,
'REMOTE_ADDR': req.remote_host,
'REMOTE_PORT': str(req.remote_port),
'wsgi.input': buffer_proxy(req.input_buffer)})
for header, value in req.get_input_headers():
header = header.replace('-', '_').upper()
if header not in ('CONTENT_LENGTH', 'CONTENT_TYPE'):
header = 'HTTP_' + header
env[header] = value
return env
def handle(self, server):
req = self.request
env = self.prepare_env(req, server)
try:
try:
result = server.application(env, self.start_response)
try:
self.data.extend(result)
finally:
if hasattr(result, 'close'):
result.close()
except:
traceback.print_exc()
try:
sys.stderr.write('Failed to handle request:\n request = %s\n application = %s\n\n' % (req, server.application))
except:
traceback.print_exc()
server.reply_error(self.request)
self = None
return
finally:
if self is not None:
self.end(env)
class WSGIServer(HTTPServer):
handler_class = WSGIHandler
base_env = {'GATEWAY_INTERFACE': 'CGI/1.1',
'SERVER_SOFTWARE': 'gevent/%d.%d Python/%d.%d' % (gevent.version_info[:2] + sys.version_info[:2]),
'SCRIPT_NAME': '',
'wsgi.version': (1, 0),
'wsgi.url_scheme': 'http',
'wsgi.errors': sys.stderr,
'wsgi.multithread': False,
'wsgi.multiprocess': False,
'wsgi.run_once': False}
def __init__(self, socket_or_address, application, **kwargs):
handler_class = kwargs.pop('handler_class', None)
if handler_class is not None:
self.handler_class = handler_class
HTTPServer.__init__(self, **kwargs)
self.address = socket_or_address
self.application = application
@property
def server_host(self):
return self.address[0]
@property
def server_port(self):
return self.address[1]
def start(self):
if self.listeners:
raise AssertionError('WSGIServer.start() cannot be called more than once')
sock = HTTPServer.start(self, self.address, backlog=self.backlog)
self.address = sock.getsockname()
env = self.base_env.copy()
env.update( {'SERVER_NAME': socket.getfqdn(self.server_host),
'SERVER_PORT': str(self.server_port) } )
self.base_env = env
return sock
def handle(self, req):
handler = self.handler_class(req)
handler.handle(self)
def extract_application(filename):
import imp
import os
basename = os.path.basename(filename)
if '.' in basename:
name, suffix = basename.rsplit('.', 1)
else:
name, suffix = basename, ''
module = imp.load_module(name, open(filename), filename, (suffix, 'r', imp.PY_SOURCE))
return module.application
if __name__ == '__main__':
import optparse
parser = optparse.OptionParser()
parser.add_option('-p', '--port', default='8080', type='int')
parser.add_option('--interface', default='127.0.0.1')
parser.add_option('--no-spawn', dest='spawn', default=True, action='store_false')
options, args = parser.parse_args()
if len(args) == 1:
filename = args[0]
try:
application = extract_application(filename)
except AttributeError:
sys.exit("Could not find application in %s" % filename)
if options.spawn:
spawn = 'default'
else:
spawn = None
server = WSGIServer((options.interface, options.port), application, spawn=spawn)
print 'Serving %s on %s:%s' % (filename, options.interface, options.port)
server.serve_forever()
else:
sys.stderr.write("USAGE: %s /path/to/app.wsgi\napp.wsgi is a python script defining 'application' callable\n" % sys.argv[0])
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