forked from saghul/uvwsgi
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uvwsgi.py
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uvwsgi.py
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import logging
import os
import pyuv
import signal
import sys
import time
import traceback
try:
from io import BytesIO # python3
except ImportError:
from cStringIO import StringIO as BytesIO # python2
from http_parser.parser import HttpParser
__all__ = ['run']
__version__ = '0.3.2'
logger = logging.getLogger('uvwsgi')
logger.setLevel(logging.DEBUG)
logging.basicConfig()
DEBUG = os.getenv('DEBUG', None) is not None
# Python 2/3 compatibility stuff
PY2 = sys.version_info[0] == 2
if PY2:
bytes_type = str
unicode_type = unicode
exec("""def reraise(tp, value, tb=None): raise tp, value, tb""")
else:
bytes_type = bytes
unicode_type = str
def reraise(tp, value, tb=None):
if value.__traceback__ is not tb:
raise value.with_traceback(tb)
raise value
def wsgi_to_bytes(s):
if isinstance(s, bytes_type):
return s
assert isinstance(s, unicode_type)
return s.encode('iso-8859-1')
_WEEKDAYNAME = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
_MONTHNAME = [None, # Dummy so we can use 1-based month numbers
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
def date_time_string(timestamp=None):
if timestamp is None:
timestamp = time.time()
year, month, day, hh, mm, ss, wd, _y, _z = time.gmtime(timestamp)
return "%s, %02d %3s %4d %02d:%02d:%02d GMT" % (
_WEEKDAYNAME[wd], day, _MONTHNAME[month], year, hh, mm, ss)
class ErrorStream(object):
def __init__(self, logger):
self._logger = logger
def write(self, data):
self._logger.error(data)
def writelines(self, seq):
for item in seq:
self.write(item)
def flush(self):
pass
class HTTPRequest(object):
def __init__(self, connection):
self.connection = connection
self.headers = None
self.body = None
self.method = None
self.url = None
self.protocol_version = None
self.close_connection = False
def process_data(self, data):
parser = self.connection.parser
ndata = len(data)
parsed = parser.execute(data, ndata)
if ndata != parsed:
logger.error('Parsing HTTP request')
self.connection.close()
return
if parser.is_headers_complete() and not self.headers:
self.headers = parser.get_headers()
self.method = parser.get_method()
self.url = parser.get_url()
self.protocol_version = 'HTTP/%s' % '.'.join(map(str, parser.get_version()))
self.close_connection = not parser.should_keep_alive()
if parser.is_message_complete():
# Do the recv_body late, this way the HttpParser will have all the chunks
# in a list and we only join them once, at the end
self.body = BytesIO(parser.recv_body())
self.run_wsgi()
def run_wsgi(self):
headers_set = []
headers_sent = []
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
buf = []
status, response_headers = headers_sent[:] = headers_set
code, _, msg = status.partition(' ')
buf.append(wsgi_to_bytes('%s %d %s\r\n' % (self.protocol_version, int(code), msg)))
header_keys = set()
for key, value in response_headers:
buf.append(wsgi_to_bytes('%s: %s\r\n' % (key, value)))
header_keys.add(key.lower())
if 'content-length' not in header_keys:
self.close_connection = True
if 'server' not in header_keys:
buf.append(wsgi_to_bytes('Server: uvwsgi/%s\r\n' % __version__))
if 'date' not in header_keys:
buf.append(wsgi_to_bytes('Date: %s\r\n' % date_time_string()))
buf.append(b'\r\n')
self.connection.write(b''.join(buf))
assert type(data) is bytes, 'applications must write bytes'
self.connection.write(data)
def start_response(status, response_headers, exc_info=None):
if exc_info:
try:
if headers_sent:
reraise(*exc_info)
finally:
exc_info = None
elif headers_set:
raise AssertionError("Headers already set!")
headers_set[:] = [status, response_headers]
# TODO: check hop by hop headers here?
return write
# Prepare WSGI environment
env = self.connection.parser.get_wsgi_environ()
env['wsgi.version'] = (1, 0)
env['wsgi.url_scheme'] = 'http'
env['wsgi.input'] = self.body
env['wsgi.errors'] = ErrorStream(logger)
env['wsgi.multithread'] = False
env['wsgi.multiprocess'] = False
env['wsgi.run_once'] = False
# Run WSGI application
app = self.connection.server.app
try:
app_response = app(env, start_response)
except Exception:
logger.exception('Running WSGI application')
if DEBUG:
response_body = traceback.format_exc()
response_headers = [('Content-Type', 'text/plain'),
('Content-Length', str(len(response_body)))]
start_response('500 Internal Server Error', response_headers, exc_info=sys.exc_info())
app_response = [response_body]
else:
self.connection.finish()
return
try:
for data in app_response:
write(data)
if not headers_sent:
write(b'')
except Exception:
logger.exception('Running WSGI application')
finally:
if hasattr(app_response, 'close'):
app_response.close()
self.end()
if DEBUG:
status = headers_set[0]
self._log(int(status.split()[0]))
def end(self):
if self.close_connection:
self.connection.finish()
else:
self.connection.request = None
def _log(self, code):
if code < 400:
log_method = logger.info
elif code < 500:
log_method = logger.warning
else:
log_method = logger.error
log_method('%d %s %s %s', code, self.method, self.url, self.connection.remote_address)
class HTTPConnection(object):
def __init__(self, handle, server):
self.server = server
self.request = None
self.parser = HttpParser(kind=0) # request only parser
self._handle = handle
self._handle.start_read(self._on_read)
self._closed = False
self._must_close = False
self._pending_writes = 0
self._remote_address = self._handle.getpeername()
@property
def remote_address(self):
return self._remote_address
def write(self, data):
self._handle.write(data, self._on_write)
self._pending_writes += 1
def finish(self):
"""Close connection once all pending writes are done"""
if self._closed or self._must_close:
return
if self._pending_writes == 0:
self.close()
else:
self._must_close = True
def close(self):
if self._closed:
return
if DEBUG:
logger.debug('Connection from %s closed', self.remote_address)
self._handle.close(self._on_close)
self._closed = True
def _on_read(self, handle, data, error):
if error is not None:
if DEBUG:
if error == pyuv.errno.UV_EOF:
logger.debug('Client closed connection')
else:
logger.debug('Read error: %d %s', error, pyuv.errno.strerror(error))
self.close()
return
if self.request is None:
self.parser.__init__(kind=0)
self.request = HTTPRequest(self)
self.request.process_data(data)
def _on_close(self, handle):
self.server.connections.remove(self)
self._handle = self.server = self.request = self.parser = None
def _on_write(self, handle, error):
if DEBUG and error is not None:
logger.error('Writing response: %d %s', error, pyuv.errno.strerror(error))
self._pending_writes -= 1
if self._pending_writes == 0 and self._must_close:
self.close()
class WSGIServer(object):
def __init__(self, loop, application, address, fd):
self.app = application
self.connections = set()
self._loop = loop
self._handle = pyuv.TCP(loop)
if fd is None:
self._handle.bind(address)
else:
self._handle.open(os.dup(fd))
self._stopped = False
logger.info('%s listening on %s', self.__class__.__name__, self._handle.getsockname())
def start(self):
self._handle.listen(self._on_connection)
def stop(self):
if self._stopped:
return
self._handle.close()
for c in self.connections:
c.close()
self._loop.stop()
self._stopped = True
def _on_connection(self, handle, error):
if error is not None:
logger.error('Accepting incoming connection: %d %s', error, pyuv.errno.strerror(error))
return
conn = pyuv.TCP(self._handle.loop)
self._handle.accept(conn)
http_connection = HTTPConnection(conn, self)
self.connections.add(http_connection)
if DEBUG:
logger.debug('Incoming connection from %s', conn.getpeername())
def run(application, address=None, fd=None):
# The one and only event loop
loop = pyuv.Loop.default_loop()
# The one and only WSGI server
server = WSGIServer(loop, application, address, fd)
# Signal handlers for quitting
sigint_h = pyuv.Signal(loop)
sigint_h.start(lambda *x: server.stop(), signal.SIGINT)
sigterm_h = pyuv.Signal(loop)
sigterm_h.start(lambda *x: server.stop(), signal.SIGTERM)
# Here we go!
server.start()
loop.run()
# Free all resources
for handle in loop.handles:
if not handle.closed:
handle.close()
def main():
from optparse import OptionParser
def import_app(s):
sys.path.insert(0, os.path.abspath(os.curdir))
mod, attr = s.rsplit(':', 1)
module = __import__(mod)
return getattr(module, attr)
parser = OptionParser()
parser.add_option('-i', '--interface', default='0.0.0.0', help='Interface to listen on for incoming requests')
parser.add_option('-p', '--port', default='8088', help='Port to listen on for incoming requests')
parser.add_option('-f', '--fd', default=None, help='File descriptor to listen on for requests')
options, args = parser.parse_args()
if len(args) != 1:
raise RuntimeError('invalid arguments')
app = import_app(args[0])
if options.fd is None:
interface = options.interface
port = int(options.port)
address = (interface, port)
fd = None
else:
address = None
fd = int(options.fd)
run(app, address=address, fd=fd)
if __name__ == '__main__':
main()