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"""Low level HTTP server."""
import asyncio
import traceback
from html import escape as html_escape
from .helpers import TimeService
from .server import ServerHttpProtocol
from .web_exceptions import HTTPException, HTTPInternalServerError
from .web_reqrep import BaseRequest
__all__ = ('RequestHandler', 'Server')
class RequestHandler(ServerHttpProtocol):
_request = None
def __init__(self, manager, **kwargs):
super().__init__(**kwargs)
self._manager = manager
self._request_factory = manager.request_factory
self._handler = manager.handler
self.time_service = manager.time_service
def __repr__(self):
if self._request is None:
meth = 'none'
path = 'none'
else:
meth = self._request.method
path = self._request.rel_url.raw_path
return "<{} {}:{} {}>".format(
self.__class__.__name__, meth, path,
'connected' if self.transport is not None else 'disconnected')
def connection_made(self, transport):
super().connection_made(transport)
self._manager.connection_made(self, transport)
def connection_lost(self, exc):
self._manager.connection_lost(self, exc)
super().connection_lost(exc)
self._request_factory = None
self._manager = None
self.time_service = None
self._handler = None
@asyncio.coroutine
def handle_request(self, message, payload):
self._manager._requests_count += 1
if self.access_log:
now = self._loop.time()
request = self._request_factory(message, payload, self)
self._request = request
try:
try:
resp = yield from self._handler(request)
except HTTPException as exc:
resp = exc
except Exception as exc:
msg = "<h1>500 Internal Server Error</h1>"
if self.debug:
try:
tb = traceback.format_exc()
tb = html_escape(tb)
msg += '<br><h2>Traceback:</h2>\n<pre>'
msg += tb
msg += '</pre>'
except: # pragma: no cover
pass
else:
msg += "Server got itself in trouble"
msg = ("<html><head><title>500 Internal Server Error</title>"
"</head><body>" + msg + "</body></html>")
resp = HTTPInternalServerError(text=msg,
content_type='text/html')
self.logger.exception(
"Error handling request",
exc_info=exc)
yield from resp.prepare(request)
yield from resp.write_eof()
finally:
resp._task = None
# notify server about keep-alive
# assign to parent class attr
self._keepalive = resp._keep_alive
# Restore default state.
# Should be no-op if server code didn't touch these attributes.
self.writer.set_tcp_cork(False)
self.writer.set_tcp_nodelay(True)
# log access
if self.access_log:
self.log_access(message, None, resp, self._loop.time() - now)
# for repr
self._request = None
class Server:
def __init__(self, handler, *, request_factory=None, loop=None, **kwargs):
if loop is None:
loop = asyncio.get_event_loop()
self._handler = handler
self._request_factory = request_factory or self._make_request
self._loop = loop
self._connections = {}
self._kwargs = kwargs
self._requests_count = 0
self._time_service = TimeService(self._loop)
@property
def requests_count(self):
"""Number of processed requests."""
return self._requests_count
@property
def handler(self):
return self._handler
@property
def request_factory(self):
return self._request_factory
@property
def time_service(self):
return self._time_service
@property
def connections(self):
return list(self._connections.keys())
def connection_made(self, handler, transport):
self._connections[handler] = transport
def connection_lost(self, handler, exc=None):
if handler in self._connections:
del self._connections[handler]
def _make_request(self, message, payload, protocol):
return BaseRequest(
message, payload,
protocol.transport, protocol.reader, protocol.writer,
protocol.time_service, protocol._request_handler)
@asyncio.coroutine
def shutdown(self, timeout=None):
coros = [conn.shutdown(timeout) for conn in self._connections]
yield from asyncio.gather(*coros, loop=self._loop)
self._connections.clear()
self._time_service.stop()
finish_connections = shutdown
def __call__(self):
return RequestHandler(
self, loop=self._loop,
**self._kwargs)
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