mirror of
https://github.com/SickGear/SickGear.git
synced 2024-11-27 15:13:38 +00:00
422 lines
12 KiB
Python
422 lines
12 KiB
Python
# Copyright 2015 The Tornado Authors
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
"""Asynchronous queues for coroutines. These classes are very similar
|
|
to those provided in the standard library's `asyncio package
|
|
<https://docs.python.org/3/library/asyncio-queue.html>`_.
|
|
|
|
.. warning::
|
|
|
|
Unlike the standard library's `queue` module, the classes defined here
|
|
are *not* thread-safe. To use these queues from another thread,
|
|
use `.IOLoop.add_callback` to transfer control to the `.IOLoop` thread
|
|
before calling any queue methods.
|
|
|
|
"""
|
|
|
|
import collections
|
|
import datetime
|
|
import heapq
|
|
|
|
from tornado import gen, ioloop
|
|
from tornado.concurrent import Future, future_set_result_unless_cancelled
|
|
from tornado.locks import Event
|
|
|
|
from typing import Union, TypeVar, Generic, Awaitable, Optional
|
|
import typing
|
|
|
|
if typing.TYPE_CHECKING:
|
|
from typing import Deque, Tuple, Any # noqa: F401
|
|
|
|
_T = TypeVar("_T")
|
|
|
|
__all__ = ["Queue", "PriorityQueue", "LifoQueue", "QueueFull", "QueueEmpty"]
|
|
|
|
|
|
class QueueEmpty(Exception):
|
|
"""Raised by `.Queue.get_nowait` when the queue has no items."""
|
|
|
|
pass
|
|
|
|
|
|
class QueueFull(Exception):
|
|
"""Raised by `.Queue.put_nowait` when a queue is at its maximum size."""
|
|
|
|
pass
|
|
|
|
|
|
def _set_timeout(
|
|
future: Future, timeout: Union[None, float, datetime.timedelta]
|
|
) -> None:
|
|
if timeout:
|
|
|
|
def on_timeout() -> None:
|
|
if not future.done():
|
|
future.set_exception(gen.TimeoutError())
|
|
|
|
io_loop = ioloop.IOLoop.current()
|
|
timeout_handle = io_loop.add_timeout(timeout, on_timeout)
|
|
future.add_done_callback(lambda _: io_loop.remove_timeout(timeout_handle))
|
|
|
|
|
|
class _QueueIterator(Generic[_T]):
|
|
def __init__(self, q: "Queue[_T]") -> None:
|
|
self.q = q
|
|
|
|
def __anext__(self) -> Awaitable[_T]:
|
|
return self.q.get()
|
|
|
|
|
|
class Queue(Generic[_T]):
|
|
"""Coordinate producer and consumer coroutines.
|
|
|
|
If maxsize is 0 (the default) the queue size is unbounded.
|
|
|
|
.. testcode::
|
|
|
|
import asyncio
|
|
from tornado.ioloop import IOLoop
|
|
from tornado.queues import Queue
|
|
|
|
q = Queue(maxsize=2)
|
|
|
|
async def consumer():
|
|
async for item in q:
|
|
try:
|
|
print('Doing work on %s' % item)
|
|
await asyncio.sleep(0.01)
|
|
finally:
|
|
q.task_done()
|
|
|
|
async def producer():
|
|
for item in range(5):
|
|
await q.put(item)
|
|
print('Put %s' % item)
|
|
|
|
async def main():
|
|
# Start consumer without waiting (since it never finishes).
|
|
IOLoop.current().spawn_callback(consumer)
|
|
await producer() # Wait for producer to put all tasks.
|
|
await q.join() # Wait for consumer to finish all tasks.
|
|
print('Done')
|
|
|
|
asyncio.run(main())
|
|
|
|
.. testoutput::
|
|
|
|
Put 0
|
|
Put 1
|
|
Doing work on 0
|
|
Put 2
|
|
Doing work on 1
|
|
Put 3
|
|
Doing work on 2
|
|
Put 4
|
|
Doing work on 3
|
|
Doing work on 4
|
|
Done
|
|
|
|
|
|
In versions of Python without native coroutines (before 3.5),
|
|
``consumer()`` could be written as::
|
|
|
|
@gen.coroutine
|
|
def consumer():
|
|
while True:
|
|
item = yield q.get()
|
|
try:
|
|
print('Doing work on %s' % item)
|
|
yield gen.sleep(0.01)
|
|
finally:
|
|
q.task_done()
|
|
|
|
.. versionchanged:: 4.3
|
|
Added ``async for`` support in Python 3.5.
|
|
|
|
"""
|
|
|
|
# Exact type depends on subclass. Could be another generic
|
|
# parameter and use protocols to be more precise here.
|
|
_queue = None # type: Any
|
|
|
|
def __init__(self, maxsize: int = 0) -> None:
|
|
if maxsize is None:
|
|
raise TypeError("maxsize can't be None")
|
|
|
|
if maxsize < 0:
|
|
raise ValueError("maxsize can't be negative")
|
|
|
|
self._maxsize = maxsize
|
|
self._init()
|
|
self._getters = collections.deque([]) # type: Deque[Future[_T]]
|
|
self._putters = collections.deque([]) # type: Deque[Tuple[_T, Future[None]]]
|
|
self._unfinished_tasks = 0
|
|
self._finished = Event()
|
|
self._finished.set()
|
|
|
|
@property
|
|
def maxsize(self) -> int:
|
|
"""Number of items allowed in the queue."""
|
|
return self._maxsize
|
|
|
|
def qsize(self) -> int:
|
|
"""Number of items in the queue."""
|
|
return len(self._queue)
|
|
|
|
def empty(self) -> bool:
|
|
return not self._queue
|
|
|
|
def full(self) -> bool:
|
|
if self.maxsize == 0:
|
|
return False
|
|
else:
|
|
return self.qsize() >= self.maxsize
|
|
|
|
def put(
|
|
self, item: _T, timeout: Optional[Union[float, datetime.timedelta]] = None
|
|
) -> "Future[None]":
|
|
"""Put an item into the queue, perhaps waiting until there is room.
|
|
|
|
Returns a Future, which raises `tornado.util.TimeoutError` after a
|
|
timeout.
|
|
|
|
``timeout`` may be a number denoting a time (on the same
|
|
scale as `tornado.ioloop.IOLoop.time`, normally `time.time`), or a
|
|
`datetime.timedelta` object for a deadline relative to the
|
|
current time.
|
|
"""
|
|
future = Future() # type: Future[None]
|
|
try:
|
|
self.put_nowait(item)
|
|
except QueueFull:
|
|
self._putters.append((item, future))
|
|
_set_timeout(future, timeout)
|
|
else:
|
|
future.set_result(None)
|
|
return future
|
|
|
|
def put_nowait(self, item: _T) -> None:
|
|
"""Put an item into the queue without blocking.
|
|
|
|
If no free slot is immediately available, raise `QueueFull`.
|
|
"""
|
|
self._consume_expired()
|
|
if self._getters:
|
|
assert self.empty(), "queue non-empty, why are getters waiting?"
|
|
getter = self._getters.popleft()
|
|
self.__put_internal(item)
|
|
future_set_result_unless_cancelled(getter, self._get())
|
|
elif self.full():
|
|
raise QueueFull
|
|
else:
|
|
self.__put_internal(item)
|
|
|
|
def get(
|
|
self, timeout: Optional[Union[float, datetime.timedelta]] = None
|
|
) -> Awaitable[_T]:
|
|
"""Remove and return an item from the queue.
|
|
|
|
Returns an awaitable which resolves once an item is available, or raises
|
|
`tornado.util.TimeoutError` after a timeout.
|
|
|
|
``timeout`` may be a number denoting a time (on the same
|
|
scale as `tornado.ioloop.IOLoop.time`, normally `time.time`), or a
|
|
`datetime.timedelta` object for a deadline relative to the
|
|
current time.
|
|
|
|
.. note::
|
|
|
|
The ``timeout`` argument of this method differs from that
|
|
of the standard library's `queue.Queue.get`. That method
|
|
interprets numeric values as relative timeouts; this one
|
|
interprets them as absolute deadlines and requires
|
|
``timedelta`` objects for relative timeouts (consistent
|
|
with other timeouts in Tornado).
|
|
|
|
"""
|
|
future = Future() # type: Future[_T]
|
|
try:
|
|
future.set_result(self.get_nowait())
|
|
except QueueEmpty:
|
|
self._getters.append(future)
|
|
_set_timeout(future, timeout)
|
|
return future
|
|
|
|
def get_nowait(self) -> _T:
|
|
"""Remove and return an item from the queue without blocking.
|
|
|
|
Return an item if one is immediately available, else raise
|
|
`QueueEmpty`.
|
|
"""
|
|
self._consume_expired()
|
|
if self._putters:
|
|
assert self.full(), "queue not full, why are putters waiting?"
|
|
item, putter = self._putters.popleft()
|
|
self.__put_internal(item)
|
|
future_set_result_unless_cancelled(putter, None)
|
|
return self._get()
|
|
elif self.qsize():
|
|
return self._get()
|
|
else:
|
|
raise QueueEmpty
|
|
|
|
def task_done(self) -> None:
|
|
"""Indicate that a formerly enqueued task is complete.
|
|
|
|
Used by queue consumers. For each `.get` used to fetch a task, a
|
|
subsequent call to `.task_done` tells the queue that the processing
|
|
on the task is complete.
|
|
|
|
If a `.join` is blocking, it resumes when all items have been
|
|
processed; that is, when every `.put` is matched by a `.task_done`.
|
|
|
|
Raises `ValueError` if called more times than `.put`.
|
|
"""
|
|
if self._unfinished_tasks <= 0:
|
|
raise ValueError("task_done() called too many times")
|
|
self._unfinished_tasks -= 1
|
|
if self._unfinished_tasks == 0:
|
|
self._finished.set()
|
|
|
|
def join(
|
|
self, timeout: Optional[Union[float, datetime.timedelta]] = None
|
|
) -> Awaitable[None]:
|
|
"""Block until all items in the queue are processed.
|
|
|
|
Returns an awaitable, which raises `tornado.util.TimeoutError` after a
|
|
timeout.
|
|
"""
|
|
return self._finished.wait(timeout)
|
|
|
|
def __aiter__(self) -> _QueueIterator[_T]:
|
|
return _QueueIterator(self)
|
|
|
|
# These three are overridable in subclasses.
|
|
def _init(self) -> None:
|
|
self._queue = collections.deque()
|
|
|
|
def _get(self) -> _T:
|
|
return self._queue.popleft()
|
|
|
|
def _put(self, item: _T) -> None:
|
|
self._queue.append(item)
|
|
|
|
# End of the overridable methods.
|
|
|
|
def __put_internal(self, item: _T) -> None:
|
|
self._unfinished_tasks += 1
|
|
self._finished.clear()
|
|
self._put(item)
|
|
|
|
def _consume_expired(self) -> None:
|
|
# Remove timed-out waiters.
|
|
while self._putters and self._putters[0][1].done():
|
|
self._putters.popleft()
|
|
|
|
while self._getters and self._getters[0].done():
|
|
self._getters.popleft()
|
|
|
|
def __repr__(self) -> str:
|
|
return "<%s at %s %s>" % (type(self).__name__, hex(id(self)), self._format())
|
|
|
|
def __str__(self) -> str:
|
|
return "<%s %s>" % (type(self).__name__, self._format())
|
|
|
|
def _format(self) -> str:
|
|
result = "maxsize=%r" % (self.maxsize,)
|
|
if getattr(self, "_queue", None):
|
|
result += " queue=%r" % self._queue
|
|
if self._getters:
|
|
result += " getters[%s]" % len(self._getters)
|
|
if self._putters:
|
|
result += " putters[%s]" % len(self._putters)
|
|
if self._unfinished_tasks:
|
|
result += " tasks=%s" % self._unfinished_tasks
|
|
return result
|
|
|
|
|
|
class PriorityQueue(Queue):
|
|
"""A `.Queue` that retrieves entries in priority order, lowest first.
|
|
|
|
Entries are typically tuples like ``(priority number, data)``.
|
|
|
|
.. testcode::
|
|
|
|
import asyncio
|
|
from tornado.queues import PriorityQueue
|
|
|
|
async def main():
|
|
q = PriorityQueue()
|
|
q.put((1, 'medium-priority item'))
|
|
q.put((0, 'high-priority item'))
|
|
q.put((10, 'low-priority item'))
|
|
|
|
print(await q.get())
|
|
print(await q.get())
|
|
print(await q.get())
|
|
|
|
asyncio.run(main())
|
|
|
|
.. testoutput::
|
|
|
|
(0, 'high-priority item')
|
|
(1, 'medium-priority item')
|
|
(10, 'low-priority item')
|
|
"""
|
|
|
|
def _init(self) -> None:
|
|
self._queue = []
|
|
|
|
def _put(self, item: _T) -> None:
|
|
heapq.heappush(self._queue, item)
|
|
|
|
def _get(self) -> _T: # type: ignore[type-var]
|
|
return heapq.heappop(self._queue)
|
|
|
|
|
|
class LifoQueue(Queue):
|
|
"""A `.Queue` that retrieves the most recently put items first.
|
|
|
|
.. testcode::
|
|
|
|
import asyncio
|
|
from tornado.queues import LifoQueue
|
|
|
|
async def main():
|
|
q = LifoQueue()
|
|
q.put(3)
|
|
q.put(2)
|
|
q.put(1)
|
|
|
|
print(await q.get())
|
|
print(await q.get())
|
|
print(await q.get())
|
|
|
|
asyncio.run(main())
|
|
|
|
.. testoutput::
|
|
|
|
1
|
|
2
|
|
3
|
|
"""
|
|
|
|
def _init(self) -> None:
|
|
self._queue = []
|
|
|
|
def _put(self, item: _T) -> None:
|
|
self._queue.append(item)
|
|
|
|
def _get(self) -> _T: # type: ignore[type-var]
|
|
return self._queue.pop()
|