-
Notifications
You must be signed in to change notification settings - Fork 58
/
connection.py
535 lines (414 loc) · 16.6 KB
/
connection.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
import asyncio
import logging
import platform
import ssl
import typing
from base64 import b64decode
from contextlib import suppress
import pamqp.frame
from pamqp import ProtocolHeader
from pamqp import specification as spec
from pamqp.heartbeat import Heartbeat
from yarl import URL
from . import exceptions as exc
from .auth import AuthMechanism
from .base import Base, task
from .channel import Channel
from .tools import censor_url
from .types import ArgumentsType, SSLCerts, URLorStr
from .version import __version__
log = logging.getLogger(__name__)
CHANNEL_CLOSE_RESPONSES = (spec.Channel.Close, spec.Channel.CloseOk)
try:
from yarl import DEFAULT_PORTS
DEFAULT_PORTS["amqp"] = 5672
DEFAULT_PORTS["amqps"] = 5671
except ImportError:
pass
PRODUCT = "aiormq"
PLATFORM = "{} {} ({} build {})".format(
platform.python_implementation(),
platform.python_version(),
*platform.python_build()
)
def parse_bool(v: str):
return v == "1" or v.lower() in ("true", "yes", "y", "enable", "on")
def parse_int(v: str):
try:
return int(v)
except ValueError:
return 0
def parse_connection_name(conn_name: str):
if not conn_name or not isinstance(conn_name, str):
return {}
return {"connection_name": conn_name}
class Connection(Base):
FRAME_BUFFER = 10
# Interval between sending heartbeats based on the heartbeat(timeout)
HEARTBEAT_INTERVAL_MULTIPLIER = 0.5
# Allow two missed heartbeats (based on heartbeat(timeout)
HEARTBEAT_GRACE_MULTIPLIER = 3
_HEARTBEAT = pamqp.frame.marshal(Heartbeat(), 0)
@staticmethod
def _parse_ca_data(data) -> typing.Optional[bytes]:
return b64decode(data) if data else data
def __init__(
self,
url: URLorStr,
*,
parent=None,
loop: asyncio.AbstractEventLoop = None
):
super().__init__(loop=loop or asyncio.get_event_loop(), parent=parent)
self.url = URL(url)
if self.url.path == "/" or not self.url.path:
self.vhost = "/"
else:
self.vhost = self.url.path[1:]
self._reader_task = None # type: asyncio.Task
self.reader = None # type: asyncio.StreamReader
self.writer = None # type: asyncio.StreamWriter
self.ssl_certs = SSLCerts(
cafile=self.url.query.get("cafile"),
capath=self.url.query.get("capath"),
cadata=self._parse_ca_data(self.url.query.get("cadata")),
key=self.url.query.get("keyfile"),
cert=self.url.query.get("certfile"),
verify=self.url.query.get("no_verify_ssl", "0") == "0",
)
self.started = False
self.__lock = asyncio.Lock()
self.__drain_lock = asyncio.Lock()
self.channels = {} # type: typing.Dict[int, typing.Optional[Channel]]
self.server_properties = None # type: spec.Connection.OpenOk
self.connection_tune = None # type: spec.Connection.TuneOk
self.last_channel = 1
self.heartbeat_monitoring = parse_bool(
self.url.query.get("heartbeat_monitoring", "1")
)
self.heartbeat_timeout = parse_int(
self.url.query.get("heartbeat", "0")
)
self.heartbeat_last_received = 0
self.last_channel_lock = asyncio.Lock()
self.connected = asyncio.Event()
self.connection_name = self.url.query.get("name")
@property
def lock(self):
if self.is_closed:
raise RuntimeError("%r closed" % self)
return self.__lock
async def drain(self):
async with self.__drain_lock:
if not self.writer:
raise RuntimeError("Writer is %r" % self.writer)
return await self.writer.drain()
@property
def is_opened(self):
return self.writer is not None and not self.is_closed
def __str__(self):
return str(censor_url(self.url))
def _get_ssl_context(self):
context = ssl.create_default_context(
(
ssl.Purpose.SERVER_AUTH
if self.ssl_certs.key
else ssl.Purpose.CLIENT_AUTH
),
capath=self.ssl_certs.capath,
cafile=self.ssl_certs.cafile,
cadata=self.ssl_certs.cadata,
)
if self.ssl_certs.key:
context.load_cert_chain(self.ssl_certs.cert, self.ssl_certs.key)
if not self.ssl_certs.verify:
context.check_hostname = False
context.verify_mode = ssl.CERT_NONE
return context
def _client_properties(self, **kwargs):
properties = {
"platform": PLATFORM,
"version": __version__,
"product": PRODUCT,
"capabilities": {
"authentication_failure_close": True,
"basic.nack": True,
"connection.blocked": False,
"consumer_cancel_notify": True,
"publisher_confirms": True,
},
"information": "See https://github.com/mosquito/aiormq/",
}
properties.update(parse_connection_name(self.connection_name))
properties.update(kwargs.get("client_properties", {}))
return properties
@staticmethod
def _credentials_class(start_frame: spec.Connection.Start):
for mechanism in start_frame.mechanisms.decode().split():
with suppress(KeyError):
return AuthMechanism[mechanism]
raise exc.AuthenticationError(
start_frame.mechanisms, [m.name for m in AuthMechanism]
)
async def __rpc(self, request: spec.Frame, wait_response=True):
self.writer.write(pamqp.frame.marshal(request, 0))
if not wait_response:
return
_, _, frame = await self.__receive_frame()
if request.synchronous and frame.name not in request.valid_responses:
raise spec.AMQPInternalError(frame, dict(frame))
elif isinstance(frame, spec.Connection.Close):
if frame.reply_code == 403:
err = exc.ProbableAuthenticationError(frame.reply_text)
else:
err = exc.ConnectionClosed(frame.reply_code, frame.reply_text)
await self.close(err)
raise err
return frame
@task
async def connect(self, client_properties: dict = None):
if self.writer is not None:
raise RuntimeError("Already connected")
ssl_context = None
if self.url.scheme == "amqps":
ssl_context = await self.loop.run_in_executor(
None, self._get_ssl_context
)
try:
self.reader, self.writer = await asyncio.open_connection(
self.url.host, self.url.port, ssl=ssl_context
)
except OSError as e:
raise ConnectionError(*e.args) from e
try:
protocol_header = ProtocolHeader()
self.writer.write(protocol_header.marshal())
res = await self.__receive_frame()
_, _, frame = res # type: spec.Connection.Start
self.heartbeat_last_received = self.loop.time()
except EOFError as e:
raise exc.IncompatibleProtocolError(*e.args) from e
credentials = self._credentials_class(frame)
self.server_properties = frame.server_properties
# noinspection PyTypeChecker
self.connection_tune = await self.__rpc(
spec.Connection.StartOk(
client_properties=self._client_properties(
**(client_properties or {})
),
mechanism=credentials.name,
response=credentials.value(self).marshal(),
)
) # type: spec.Connection.Tune
if self.heartbeat_timeout > 0:
self.connection_tune.heartbeat = self.heartbeat_timeout
await self.__rpc(
spec.Connection.TuneOk(
channel_max=self.connection_tune.channel_max,
frame_max=self.connection_tune.frame_max,
heartbeat=self.connection_tune.heartbeat,
),
wait_response=False,
)
await self.__rpc(spec.Connection.Open(virtual_host=self.vhost))
# noinspection PyAsyncCall
self._reader_task = self.create_task(self.__reader())
# noinspection PyAsyncCall
heartbeat_task = self.create_task(self.__heartbeat_task())
heartbeat_task.add_done_callback(self._on_heartbeat_done)
self.loop.call_soon(self.connected.set)
return True
def _on_heartbeat_done(self, future):
if not future.cancelled() and future.exception():
self.create_task(
self.close(ConnectionError("heartbeat task was failed."))
)
async def __heartbeat_task(self):
if not self.connection_tune.heartbeat:
return
heartbeat_interval = (
self.connection_tune.heartbeat * self.HEARTBEAT_INTERVAL_MULTIPLIER
)
heartbeat_grace_timeout = (
self.connection_tune.heartbeat * self.HEARTBEAT_GRACE_MULTIPLIER
)
while self.writer:
# Send heartbeat to server unconditionally
self.writer.write(self._HEARTBEAT)
await asyncio.sleep(heartbeat_interval)
if not self.heartbeat_monitoring:
continue
# Check if the server sent us something
# within the heartbeat grace period
last_heartbeat = self.loop.time() - self.heartbeat_last_received
if last_heartbeat <= heartbeat_grace_timeout:
continue
await self.close(
ConnectionError(
"Server connection probably hang, last heartbeat "
"received %.3f seconds ago" % last_heartbeat
)
)
return
async def __receive_frame(self) -> typing.Tuple[int, int, spec.Frame]:
async with self.lock:
frame_header = await self.reader.readexactly(1)
if frame_header == b"\0x00":
raise spec.AMQPFrameError(await self.reader.read())
if self.reader is None:
raise ConnectionError
frame_header += await self.reader.readexactly(6)
if not self.started and frame_header.startswith(b"AMQP"):
raise spec.AMQPSyntaxError
else:
self.started = True
frame_type, _, frame_length = pamqp.frame.frame_parts(frame_header)
frame_payload = await self.reader.readexactly(frame_length + 1)
return pamqp.frame.unmarshal(frame_header + frame_payload)
@staticmethod
def __exception_by_code(frame: spec.Connection.Close):
if frame.reply_code == 501:
return exc.ConnectionFrameError(frame.reply_text)
elif frame.reply_code == 502:
return exc.ConnectionSyntaxError(frame.reply_text)
elif frame.reply_code == 503:
return exc.ConnectionCommandInvalid(frame.reply_text)
elif frame.reply_code == 504:
return exc.ConnectionChannelError(frame.reply_text)
elif frame.reply_code == 505:
return exc.ConnectionUnexpectedFrame(frame.reply_text)
elif frame.reply_code == 506:
return exc.ConnectionResourceError(frame.reply_text)
elif frame.reply_code == 530:
return exc.ConnectionNotAllowed(frame.reply_text)
elif frame.reply_code == 540:
return exc.ConnectionNotImplemented(frame.reply_text)
elif frame.reply_code == 541:
return exc.ConnectionInternalError(frame.reply_text)
else:
return exc.ConnectionClosed(frame.reply_code, frame.reply_text)
@task
async def __reader(self):
try:
while not self.reader.at_eof():
weight, channel, frame = await self.__receive_frame()
self.heartbeat_last_received = self.loop.time()
if channel == 0:
if isinstance(frame, spec.Connection.CloseOk):
return
if isinstance(frame, spec.Connection.Close):
return await self.close(
self.__exception_by_code(frame)
)
elif isinstance(frame, Heartbeat):
continue
log.error("Unexpected frame %r", frame)
continue
if self.channels.get(channel) is None:
log.exception(
"Got frame for closed channel %d: %r", channel, frame
)
continue
ch = self.channels[channel]
if isinstance(frame, CHANNEL_CLOSE_RESPONSES):
self.channels[channel] = None
await ch.frames.put((weight, frame))
except asyncio.CancelledError as e:
log.debug("Reader task cancelled:", exc_info=e)
except asyncio.IncompleteReadError as e:
log.debug("Can not read bytes from server:", exc_info=e)
await self.close(ConnectionError(*e.args))
except Exception as e:
log.debug("Reader task exited because:", exc_info=e)
await self.close(e)
@staticmethod
async def __close_writer(writer: asyncio.StreamWriter):
if writer is None:
return
writer.close()
if hasattr(writer, "wait_closed"):
await writer.wait_closed()
async def _on_close(self, ex=exc.ConnectionClosed(0, "normal closed")):
frame = (
spec.Connection.CloseOk()
if isinstance(ex, exc.ConnectionClosed)
else spec.Connection.Close()
)
await asyncio.gather(
self.__rpc(frame, wait_response=False), return_exceptions=True
)
writer = self.writer
self.reader = None
self.writer = None
self._reader_task = None
await asyncio.gather(
self.__close_writer(writer), return_exceptions=True
)
await asyncio.gather(self._reader_task, return_exceptions=True)
@property
def server_capabilities(self) -> ArgumentsType:
return self.server_properties["capabilities"]
@property
def basic_nack(self) -> bool:
return self.server_capabilities.get("basic.nack")
@property
def consumer_cancel_notify(self) -> bool:
return self.server_capabilities.get("consumer_cancel_notify")
@property
def exchange_exchange_bindings(self) -> bool:
return self.server_capabilities.get("exchange_exchange_bindings")
@property
def publisher_confirms(self):
return self.server_capabilities.get("publisher_confirms")
async def channel(
self,
channel_number: int = None,
publisher_confirms=True,
frame_buffer=FRAME_BUFFER,
**kwargs
) -> Channel:
await self.connected.wait()
if self.is_closed:
raise RuntimeError("%r closed" % self)
if not self.publisher_confirms and publisher_confirms:
raise ValueError("Server doesn't support publisher_confirms")
if channel_number is None:
async with self.last_channel_lock:
if self.channels:
self.last_channel = max(self.channels.keys())
while self.last_channel in self.channels.keys():
self.last_channel += 1
if self.last_channel > 65535:
log.warning("Resetting channel number for %r", self)
self.last_channel = 1
# switching context for prevent blocking event-loop
await asyncio.sleep(0)
channel_number = self.last_channel
elif channel_number in self.channels:
raise ValueError("Channel %d already used" % channel_number)
if channel_number < 0 or channel_number > 65535:
raise ValueError("Channel number too large")
channel = Channel(
self,
channel_number,
frame_buffer=frame_buffer,
publisher_confirms=publisher_confirms,
**kwargs
)
self.channels[channel_number] = channel
try:
await channel.open()
except Exception:
self.channels[channel_number] = None
raise
return channel
async def __aenter__(self):
await self.connect()
async def connect(url, *args, client_properties=None, **kwargs) -> Connection:
connection = Connection(url, *args, **kwargs)
try:
await connection.connect(client_properties or {})
except Exception as e:
await connection.close(e)
raise
return connection