async def handle(self, event: Event) -> None:
if isinstance(event, RawData):
try:
header = pull_quic_header(Buffer(data=event.data), host_cid_length=8)
except ValueError:
return
if (
header.version is not None
and header.version not in self.quic_config.supported_versions
):
data = encode_quic_version_negotiation(
source_cid=header.destination_cid,
destination_cid=header.source_cid,
supported_versions=self.quic_config.supported_versions,
)
await self.send(RawData(data=data, address=event.address))
return
connection = self.connections.get(header.destination_cid)
if (
connection is None
and len(event.data) >= 1200
and header.packet_type == PACKET_TYPE_INITIAL
):
connection = QuicConnection(
configuration=self.quic_config, original_connection_id=None
)
self.connections[header.destination_cid] = connection
self.connections[connection.host_cid] = connection
if connection is not None:
connection.receive_datagram(event.data, event.address, now=self.now())
await self._handle_events(connection, event.address)
elif isinstance(event, Closed):
pass
class http3_request_handler(http2_handler.http2_request_handler):
producer_class = http3_producer
stateless_retry = True
conns = {}
errno = ErrorCode
def __init__(self, handler, request):
self._default_varialbes(handler, request)
self.quic = None # QUIC protocol
self.conn = None # HTTP3 Protocol
self._push_map = {}
self._retry = QuicRetryTokenHandler() if self.stateless_retry else None
def _initiate_shutdown(self):
# pahse I: send goaway
with self._plock:
self.conn.shutdown(self._shutdown_reason[-1])
def _proceed_shutdown(self):
# phase II: close quic
if self.quic:
errcode, msg, _ = self._shutdown_reason
with self._plock:
self.quic.close(errcode, reason_phrase=msg or '')
self.send_data()
def _make_connection(self, channel, data):
ctx = channel.server.ctx
buf = Buffer(data=data)
header = pull_quic_header(buf,
host_cid_length=ctx.connection_id_length)
# version negotiation
if header.version is not None and header.version not in ctx.supported_versions:
self.channel.push(
encode_quic_version_negotiation(
source_cid=header.destination_cid,
destination_cid=header.source_cid,
supported_versions=ctx.supported_versions,
))
return
conn = self.conns.get(header.destination_cid)
if conn:
conn._linked_channel.close()
conn._linked_channel = channel
self.quic = conn._quic
self.conn = conn
return
if header.packet_type != PACKET_TYPE_INITIAL or len(data) < 1200:
return
original_connection_id = None
if self._retry is not None:
if not header.token:
# create a retry token
channel.push(
encode_quic_retry(
version=header.version,
source_cid=os.urandom(8),
destination_cid=header.source_cid,
original_destination_cid=header.destination_cid,
retry_token=self._retry.create_token(
channel.addr, header.destination_cid)))
return
else:
try:
original_connection_id = self._retry.validate_token(
channel.addr, header.token)
except ValueError:
return
self.quic = QuicConnection(
configuration=ctx,
logger_connection_id=original_connection_id
or header.destination_cid,
original_connection_id=original_connection_id,
session_ticket_fetcher=channel.server.ticket_store.pop,
session_ticket_handler=channel.server.ticket_store.add)
self.conn = H3Connection(self.quic)
self.conn._linked_channel = channel
def _handle_events(self, events):
for event in events:
if isinstance(event, HeadersReceived):
created = self.handle_request(
event.stream_id,
event.headers,
has_data_frame=not event.stream_ended,
push_id=event.push_id)
if created:
r = self.get_request(event.stream_id)
if event.stream_ended:
r.set_stream_ended()
elif isinstance(event, DataReceived) and event.data:
r = self.get_request(event.stream_id)
if not r:
self.close(self.errno.INTERNAL_ERROR)
else:
try:
r.channel.set_data(event.data, len(event.data))
except ValueError:
self.close(self.errno.INTERNAL_ERROR)
if event.stream_ended:
if r.collector:
r.channel.handle_read()
r.channel.found_terminator()
r.set_stream_ended()
if r.response.is_done():
self.remove_request(event.stream_id)
elif isinstance(event, PushCanceled):
with self._clock:
try:
del self._push_map[event.push_id]
except KeyError:
pass
self.remove_push_stream(event.push_id)
self.send_data()
def process_quic_events(self):
while 1:
with self._plock:
event = self.quic.next_event()
if event is None:
break
if isinstance(event, events.StreamDataReceived):
h3_events = self.conn.handle_event(event)
h3_events and self._handle_events(h3_events)
elif isinstance(event, events.ConnectionIdIssued):
self.conns[event.connection_id] = self.conn
elif isinstance(event, events.ConnectionIdRetired):
assert self.conns[event.connection_id] == self.conn
conn = self.conns.pop(event.connection_id)
conn._linked_channel = None
elif isinstance(event, events.ConnectionTerminated):
for cid, conn in list(self.conns.items()):
if conn == self.conn:
conn._linked_channel = None
del self.conns[cid]
self._terminate_connection()
elif isinstance(event, events.HandshakeCompleted):
pass
elif isinstance(event, events.PingAcknowledged):
# for now nothing to do, channel will be extened by event time
pass
def collect_incoming_data(self, data):
# print ('collect_incoming_data', self.quic, len (data))
if self.quic is None:
self._make_connection(self.channel, data)
if self.quic is None:
return
with self._plock:
self.quic.receive_datagram(data, self.channel.addr,
time.monotonic())
self.process_quic_events()
self.send_data()
def reset_stream(self, stream_id):
raise AttributeError(
'HTTP/3 can cancel for only push stream, use cancel_push (push_id)'
)
def remove_stream(self, stream_id):
raise AttributeError('use remove_push_stream (push_id)')
def remove_push_stream(self, push_id):
# received by client and just reset
with self._clock:
try:
stream_id = self._push_map.pop(push_id)
except KeyError:
return
super().remove_stream(stream_id)
def cancel_push(self, push_id):
# send to client and reset
with self._clock:
try:
steram_id = self._push_map.pop(push_id)
except KeyError:
return # already done or canceled
with self._plock:
self.conn.cancel_push(push_id)
super().remove_stream(steram_id)
self.send_data()
def data_to_send(self):
if self.quic is None or self._closed:
return []
self._data_from_producers()
with self._plock:
data_to_send = [
data for data, addr in self.quic.datagrams_to_send(
now=time.monotonic())
]
return data_to_send or self._data_exhausted()
def pushable(self):
return self.request_acceptable()
def _maybe_duplicated(self, stream_id, headers):
path = None
for k, v in headers:
if k[0] != 58: break
elif k == b':path':
path = v.decode()
elif k == b':method' and v != b"GET":
return False
assert path, ':path is missing'
with self._clock:
push_id = self._pushed_pathes.get(path)
if push_id is None or push_id not in self._push_map:
return False
with self._plock:
self.conn.send_duplicate_push(stream_id, push_id)
return True
def handle_request(self,
stream_id,
headers,
has_data_frame=False,
push_id=None):
if push_id is None:
with self._clock:
pushing = len(self._pushed_pathes)
if pushing and self._maybe_duplicated(stream_id, headers):
return False
return super().handle_request(stream_id, headers, has_data_frame)
def push_promise(self, stream_id, request_headers,
addtional_request_headers):
name_, path = request_headers[0]
assert name_ == ':path', ':path header missing'
headers = [(k.encode(), v.encode())
for k, v in request_headers + addtional_request_headers]
try:
promise_stream_id = self.conn.send_push_promise(
stream_id=stream_id, headers=headers)
try:
push_id = self.conn.get_push_id(promise_stream_id)
except AttributeError:
push_id = self.conn._next_push_id - 1
except NoAvailablePushIDError:
return
with self._clock:
self._push_map[push_id] = promise_stream_id
self._pushed_pathes[path] = push_id
self._handle_events([
HeadersReceived(headers=headers,
stream_ended=True,
stream_id=promise_stream_id,
push_id=push_id)
])
class Connection:
session_ticket = '/tmp/http3-session-ticket.pik'
socket_timeout = 1
def __init__ (self, addr, enable_push = True):
# prepare configuration
self.netloc = addr
try:
host, port = addr.split (":", 1)
port = int (port)
except ValueError:
host, port = addr, 443
self.addr = (host, port)
self.configuration = QuicConfiguration(is_client = True, alpn_protocols = H3_ALPN)
self.configuration.load_verify_locations(os.path.join (os.path.dirname (__file__), 'pycacert.pem'))
self.configuration.verify_mode = ssl.CERT_NONE
self.load_session_ticket ()
self.socket = socket.socket (socket.AF_INET, socket.SOCK_DGRAM)
self.socket.settimeout (self.socket_timeout)
self._connected = False
self._closed = False
self._history = []
self._allow_push = enable_push
self._response = None
def connect (self):
host, port = self.addr
try:
ipaddress.ip_address(host)
server_name = None
except ValueError:
server_name = host
if server_name is not None:
self.configuration.server_name = server_name
self._quic = QuicConnection (
configuration = self.configuration, session_ticket_handler = self.save_session_ticket
)
self._http = H3Connection(self._quic)
self._quic.connect(self.addr, now=time.monotonic ())
self.transmit ()
def close (self):
self.transmit ()
self.recv ()
#self.socket.close ()
self._closed = True
def transmit (self):
dts = self._quic.datagrams_to_send(now=time.monotonic ())
if not dts:
return
for data, addr in dts:
#print ('<---', len (data), repr (data [:30]))
sent = self.socket.sendto (data, self.addr)
self.recv ()
def recv (self):
while 1:
try:
data, addr = self.socket.recvfrom (4096)
except socket.timeout:
break
#print ('--->', len (data), repr (data [:30]))
self._quic.receive_datagram(data, addr, now = time.monotonic ())
self._process_events()
self.transmit ()
def save_session_ticket (self, ticket):
with open(self.session_ticket, "wb") as fp:
pickle.dump(ticket, fp)
def load_session_ticket (self):
try:
with open(self.session_ticket, "rb") as fp:
self.configuration.session_ticket = pickle.load(fp)
except FileNotFoundError:
pass
def _process_events(self):
event = self._quic.next_event()
while event is not None:
if isinstance(event, events.ConnectionTerminated):
self._connected = False
self.close ()
elif isinstance(event, events.HandshakeCompleted):
self._connected = True
elif isinstance(event, events.PingAcknowledged):
pass
self.quic_event_received(event)
event = self._quic.next_event()
def http_event_received (self, http_event):
if isinstance(http_event, HeadersReceived):
self._response.headers = {k: v for k, v in http_event.headers}
elif isinstance(http_event, DataReceived):
if http_event.stream_id % 4 == 0:
self._response.data += http_event.data
elif isinstance(http_event, PushPromiseReceived):
push_headers = {}
for k, v in http_event.headers:
push_headers [k.decode ()] = v.decode ()
self._response.promises.append (push_headers)
def quic_event_received (self, event):
# pass event to the HTTP layer
if self._response and not isinstance (event, events.StreamDataReceived):
self._response.events.append (event)
for http_event in self._http.handle_event(event):
if not isinstance (http_event, (HeadersReceived, PushPromiseReceived, DataReceived)):
# logging only control frames
self._response.events.append (http_event)
self.http_event_received(http_event)
def handle_request (self, request):
if self._closed:
raise ConnectionClosed
if not self._connected:
self.connect ()
self._response = request.response
stream_id = self._quic.get_next_available_stream_id()
self._response.stream_id = stream_id
self._http.send_headers(
stream_id=stream_id,
headers = [
(b":method", request.method.encode("utf8")),
(b":scheme", request.url.scheme.encode("utf8")),
(b":authority", request.url.authority.encode("utf8")),
(b":path", request.url.full_path.encode("utf8")),
(b"user-agent", b"aioquic"),
]
+ [
(k.encode("utf8"), v.encode("utf8"))
for (k, v) in request.headers.items()
],
)
self._http.send_data (stream_id=stream_id, data=request.content, end_stream=True)
self.transmit()
self._response = None
return request.response
def get (self, url, headers = {}):
req = HttpRequest ('GET', 'https://{}{}'.format (self.netloc, url), b'', headers)
return self.handle_request (req)
def post (self, url, data, headers = {}):
req = HttpRequest ('POST', 'https://{}{}'.format (self.netloc, url), data, headers)
return self.handle_request (req)
def request (self, method, url, data = b'', headers = {}):
req = HttpRequest (method, 'https://{}{}'.format (self.netloc, url), data, headers)
return self.handle_request (req)