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api_test.py
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api_test.py
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# Copyright 2021 The Duet 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
#
# https://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.
import inspect
import sys
import time
import traceback
from typing import List
import pytest
import duet
import duet.impl as impl
async def mul(a, b):
await duet.completed_future(None)
return a * b
async def add(a, b):
await duet.completed_future(None)
return a + b
class Fail(Exception):
pass
async def fail_after_await():
await duet.completed_future(None)
raise Fail()
async def fail_before_await():
raise Fail()
fail_funcs = [fail_after_await, fail_before_await]
class TestAwaitableFunc:
def test_wrap_async_func(self):
async def async_func(a, b):
await duet.completed_future(None)
return a + b
assert duet.awaitable_func(async_func) is async_func
assert duet.run(async_func, 1, 2) == 3
def test_wrap_sync_func(self):
def sync_func(a, b):
return a + b
wrapped = duet.awaitable_func(sync_func)
assert inspect.iscoroutinefunction(wrapped)
assert duet.awaitable_func(wrapped) is wrapped # Don't double-wrap
assert duet.run(wrapped, 1, 2) == 3
class TestRun:
def test_future(self):
def func(value):
return duet.completed_future(value * 2)
assert duet.run(func, 1) == 2
def test_function(self):
async def func(value):
value = await duet.completed_future(value * 2)
return value * 3
assert duet.run(func, 1) == 2 * 3
def test_function_returning_none(self):
side_effects = []
async def func(value):
value = await duet.completed_future(value * 2)
value = await duet.completed_future(value * 3)
side_effects.append(value)
assert duet.run(func, 1) is None
assert side_effects == [2 * 3] # make sure func ran to completion
def test_nested_functions(self):
async def func(value):
value = await sub_func(value * 2)
return value * 3
async def sub_func(value):
value = await duet.completed_future(value * 5)
return value * 7
assert duet.run(func, 1) == 2 * 3 * 5 * 7
def test_nested_functions_returning_none(self):
side_effects = []
async def func(value):
value2 = await sub_func(value * 2)
return value * 3, value2
async def sub_func(value):
value = await duet.completed_future(value * 5)
value = await duet.completed_future(value * 7)
side_effects.append(value)
assert duet.run(func, 1) == (3, None)
assert side_effects == [2 * 5 * 7]
def test_failed_future(self):
async def func(value):
try:
await duet.failed_future(Exception())
return value * 2
except Exception:
return value * 3
assert duet.run(func, 1) == 3
def test_failed_nested_generator(self):
side_effects = []
async def func(value):
try:
await sub_func(value * 2)
return value * 3
except Exception:
return value * 5
async def sub_func(value):
await duet.failed_future(Exception())
side_effects.append(value * 7)
assert duet.run(func, 1) == 5
assert side_effects == []
@pytest.mark.parametrize("fail_func", fail_funcs)
def test_failure_propagates(self, fail_func):
with pytest.raises(Fail):
duet.run(fail_func)
class TestPmap:
def test_ordering(self):
"""pmap results are in order, even if funcs finish out of order."""
finished = []
async def func(value):
iterations = 10 - value
for i in range(iterations):
await duet.completed_future(i)
finished.append(value)
return value * 2
results = duet.pmap(func, range(10), limit=10)
assert results == [i * 2 for i in range(10)]
assert finished == list(reversed(range(10)))
@pytest.mark.parametrize("limit", [3, 10, None])
def test_failure(self, limit):
async def foo(i):
if i == 7:
raise ValueError("I do not like 7 :-(")
return 7 * i
with pytest.raises(ValueError):
duet.pmap(foo, range(100), limit=limit)
class TestPstarmap:
def test_ordering(self):
"""pstarmap results are in order, even if funcs finish out of order."""
finished = []
async def func(a, b):
value = 5 * a + b
iterations = 10 - value
for i in range(iterations):
await duet.completed_future(i)
finished.append(value)
return value * 2
args_iter = ((a, b) for a in range(2) for b in range(5))
results = duet.pstarmap(func, args_iter, limit=10)
assert results == [i * 2 for i in range(10)]
assert finished == list(reversed(range(10)))
class TestPmapAsync:
@duet.sync
async def test_ordering(self):
"""pmap_async results in order, even if funcs finish out of order."""
finished = []
async def func(value):
iterations = 10 - value
for i in range(iterations):
await duet.completed_future(i)
finished.append(value)
return value * 2
results = await duet.pmap_async(func, range(10), limit=10)
assert results == [i * 2 for i in range(10)]
assert finished == list(reversed(range(10)))
@duet.sync
async def test_laziness(self):
live = set()
async def func(i):
num_live = len(live)
live.add(i)
await duet.completed_future(i)
live.remove(i)
return num_live
num_lives = await duet.pmap_async(func, range(100), limit=10)
assert all(num_live <= 10 for num_live in num_lives)
class TestPstarmapAsync:
@duet.sync
async def test_ordering(self):
"""pstarmap_async results in order, even if funcs finish out of order."""
finished = []
async def func(a, b):
value = 5 * a + b
iterations = 10 - value
for i in range(iterations):
await duet.completed_future(i)
finished.append(value)
return value * 2
args_iter = ((a, b) for a in range(2) for b in range(5))
results = await duet.pstarmap_async(func, args_iter, limit=10)
assert results == [i * 2 for i in range(10)]
assert finished == list(reversed(range(10)))
class TestLimiter:
@duet.sync
async def test_ordering(self):
"""Check that waiting coroutines acquire limiter in order."""
limiter = duet.Limiter(1)
acquired = []
async def func(i):
async with limiter:
acquired.append(i)
await duet.completed_future(None)
async with duet.new_scope() as scope:
for i in range(10):
scope.spawn(func, i)
assert acquired == sorted(acquired)
@duet.sync
async def test_resize_capacity(self) -> None:
"""Check that resizing correctly lets running tasks complete."""
limiter = duet.Limiter(3)
async with duet.new_scope() as scope:
acqs: List[duet.AwaitableFuture[None]] = []
completed: List[int] = []
unlocks: List[duet.AwaitableFuture[None]] = []
dones: List[duet.AwaitableFuture[None]] = []
def spawn(i: int) -> None:
"""Spawn a new "controllable" async task.
We can await limiter slot acquisition, and await when the task
completes.
"""
acq = duet.AwaitableFuture[None]()
done = duet.AwaitableFuture[None]()
unlock = duet.AwaitableFuture[None]()
acqs.append(acq)
dones.append(done)
unlocks.append(unlock)
async def func():
async with limiter:
acq.set_result(None)
await unlock
done.set_result(None)
completed.append(i)
scope.spawn(func)
# Spawn three tasks.
for i in range(3):
spawn(i)
# Wait for the last task to acquire the limiter.
await acqs[-1]
# Resize the limiter down to 2.
limiter.capacity = 2
assert not limiter.is_available()
# unlock one, and ensure the limiter is still unavailable.
unlocks.pop(0).set_result(None)
assert not limiter.is_available()
await dones.pop(0)
# unlock one more, which should free a slot.
unlocks.pop(0).set_result(None)
await dones.pop(0)
assert limiter.is_available()
# acquire again, this time hitting the limit of 2 again.
spawn(3)
await acqs[-1]
assert not limiter.is_available()
# complete all tasks.
for f in unlocks:
f.set_result(None)
# Ensure that all spawned tasks completed in the right order.
assert completed == list(range(4))
@duet.sync
async def test_sleep():
start = time.time()
await duet.sleep(0.5)
assert abs((time.time() - start) - 0.5) < 0.2
class TestScope:
@duet.sync
async def test_run_all(self):
results = {}
async def func(a, b):
results[a, b] = await mul(a, b)
async with duet.new_scope() as scope:
for a in range(10):
for b in range(10):
scope.spawn(func, a, b)
assert results == {(a, b): a * b for a in range(10) for b in range(10)}
@pytest.mark.parametrize("fail_func", fail_funcs)
@duet.sync
async def test_failure_in_spawned_task(self, fail_func):
after_fail = False
with pytest.raises(Fail):
async with duet.new_scope() as scope:
for a in range(10):
scope.spawn(mul, a, a)
scope.spawn(fail_func)
after_fail = True # This should still run.
assert after_fail
@duet.sync
async def test_sync_failure_in_main_task(self):
# pylint: disable=unreachable
after_await = False
with pytest.raises(Fail):
async with duet.new_scope() as scope:
scope.spawn(mul, 2, 3)
raise Fail()
after_await = True # This should not run.
assert not after_await
# pyline: enable=unreachable
@duet.sync
async def test_async_failure_in_main_task(self):
after_await = False
with pytest.raises(Fail):
async with duet.new_scope() as scope:
scope.spawn(mul, 2, 3)
await duet.failed_future(Fail())
after_await = True # This should not run.
assert not after_await
def test_interrupt_not_included_in_stack_trace(self):
async def func():
async with duet.new_scope() as scope:
f = duet.AwaitableFuture()
scope.spawn(lambda: f)
f.set_exception(ValueError("oops!"))
await duet.AwaitableFuture()
with pytest.raises(ValueError, match="oops!") as exc_info:
duet.run(func)
stack_trace = "".join(
traceback.format_exception(exc_info.type, exc_info.value, exc_info.tb)
)
assert "Interrupt" not in stack_trace
assert isinstance(exc_info.value.__context__, impl.Interrupt)
assert exc_info.value.__suppress_context__
@duet.sync
async def test_timeout(self):
future = duet.AwaitableFuture()
start = time.time()
with pytest.raises(TimeoutError):
async with duet.timeout_scope(0.5):
await future
assert abs((time.time() - start) - 0.5) < 0.2
assert future.cancelled()
@duet.sync
async def test_deadline(self):
future = duet.AwaitableFuture()
start = time.time()
with pytest.raises(TimeoutError):
async with duet.deadline_scope(time.time() + 0.5):
await future
assert abs((time.time() - start) - 0.5) < 0.2
assert future.cancelled()
@duet.sync
async def test_scope_timeout_cancels_all_subtasks(self):
futures = []
task_timeouts = []
async def task():
try:
f = duet.AwaitableFuture()
futures.append(f)
await f
except TimeoutError:
task_timeouts.append(True)
else:
task_timeouts.append(False)
start = time.time()
with pytest.raises(TimeoutError):
async with duet.new_scope(timeout=0.5) as scope:
scope.spawn(task)
scope.spawn(task)
await duet.AwaitableFuture()
assert abs((time.time() - start) - 0.5) < 0.2
assert task_timeouts == [True, True]
assert all(f.cancelled() for f in futures)
@duet.sync
async def test_cancel(self):
task_future = duet.AwaitableFuture()
scope_future = duet.AwaitableFuture()
async def main_task():
with pytest.raises(duet.CancelledError):
async with duet.new_scope() as scope:
scope_future.set_result(scope)
await task_future
async def cancel_task():
scope = await scope_future
scope.cancel()
async with duet.new_scope() as scope:
scope.spawn(main_task)
scope.spawn(cancel_task)
assert task_future.cancelled()
@pytest.mark.skipif(
sys.version_info >= (3, 8), reason="inapplicable for python 3.8+ (can be removed)"
)
@duet.sync
async def test_multiple_calls_to_future_set_result():
"""This checks a scenario that caused deadlocks in earlier versions."""
async def set_results(*fs):
for f in fs:
await duet.completed_future(None)
f.set_result(None)
async with duet.new_scope() as scope:
f0 = duet.AwaitableFuture()
f1 = duet.AwaitableFuture()
scope.spawn(set_results, f0)
await f0
# Calling f0.set_result again should not mark this main task as ready.
# If it does, then the duet scheduler will try to advance the task and
# will block on getting the result of f1. This prevents the background
# `set_results` task from advancing and actually calling f1.set_result,
# so we would deadlock.
scope.spawn(set_results, f0, f1)
await f1