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import pytest
import platform
import unittest
import asyncio
from gi.repository import GLib, Gio
from gi.events import GLibEventLoopPolicy
class TestAsync(unittest.TestCase):
def setUp(self):
policy = GLibEventLoopPolicy()
asyncio.set_event_loop_policy(policy)
self.addCleanup(asyncio.set_event_loop_policy, None)
self.loop = policy.get_event_loop()
self.addCleanup(self.loop.close)
def test_async_enumerate(self):
f = Gio.file_new_for_path("./")
called = False
def cb():
nonlocal called
called = True
async def run():
nonlocal called, self
self.loop.call_soon(cb)
iter_info = [
info.get_name()
for info in await f.enumerate_children_async(
"standard::*", 0, GLib.PRIORITY_DEFAULT
)
]
# The await runs the mainloop and cb is called.
self.assertEqual(called, True)
next_info = []
enumerator = f.enumerate_children("standard::*", 0, None)
while True:
info = enumerator.next_file(None)
if info is None:
break
next_info.append(info.get_name())
self.assertEqual(iter_info, next_info)
self.loop.run_until_complete(run())
def test_async_cancellation(self):
"""Cancellation raises G_IO_ERROR_CANCELLED."""
f = Gio.file_new_for_path("./")
async def run():
nonlocal self
# cancellable created implicitly
res = f.enumerate_children_async("standard::*", 0, GLib.PRIORITY_DEFAULT)
res.cancel()
with self.assertRaisesRegex(GLib.GError, "Operation was cancelled"):
await res
# cancellable passed explicitly
cancel = Gio.Cancellable()
res = f.enumerate_children_async(
"standard::*", 0, GLib.PRIORITY_DEFAULT, cancel
)
self.assertEqual(res.cancellable, cancel)
cancel.cancel()
with self.assertRaisesRegex(GLib.GError, "Operation was cancelled"):
await res
self.loop.run_until_complete(run())
def test_not_completed(self):
"""Querying an uncompleted task raises exceptions."""
f = Gio.file_new_for_path("./")
async def run():
nonlocal self
# cancellable created implicitly
res = f.enumerate_children_async("standard::*", 0, GLib.PRIORITY_DEFAULT)
with self.assertRaises(asyncio.InvalidStateError):
res.result()
with self.assertRaises(asyncio.InvalidStateError):
res.exception()
# And, await it
await res
self.loop.run_until_complete(run())
def test_async_cancel_completed(self):
"""Cancelling a completed task just cancels the cancellable."""
f = Gio.file_new_for_path("./")
async def run():
nonlocal self
res = f.enumerate_children_async("standard::*", 0, GLib.PRIORITY_DEFAULT)
await res
assert not res.cancellable.is_cancelled()
res.cancel()
assert res.cancellable.is_cancelled()
self.loop.run_until_complete(run())
def test_async_completed_add_cb(self):
"""Adding a done cb to a completed future queues it with call_soon."""
f = Gio.file_new_for_path("./")
called = False
def cb():
nonlocal called
called = True
async def run():
nonlocal called, self
res = f.enumerate_children_async("standard::*", 0, GLib.PRIORITY_DEFAULT)
await res
self.loop.call_soon(cb)
# Python await is smart and does not iterate the EventLoop
await res
assert not called
# So create a new future and wait on that
fut = asyncio.Future()
def done_cb(res):
nonlocal fut
fut.set_result(res.result())
res.add_done_callback(done_cb)
await fut
assert called
self.loop.run_until_complete(run())
@pytest.mark.xfail(
platform.python_implementation() == "PyPy",
reason="Exception reporting does not work in pypy",
)
def test_deleting_failed_logs(self):
f = Gio.file_new_for_path("./")
async def run():
nonlocal self
res = f.enumerate_children_async("standard::*", 0, GLib.PRIORITY_DEFAULT)
res.cancel()
# Cancellation in Gio is not immediate, so sleep for a bit
await asyncio.sleep(0.5)
exc = None
msg = None
def handler(loop, context):
nonlocal exc, msg
msg = context["message"]
exc = context["exception"]
self.loop.set_exception_handler(handler)
self.loop.run_until_complete(run())
self.assertRegex(msg, ".*exception was never retrieved")
self.assertIsInstance(exc, GLib.GError)
assert exc.matches(Gio.io_error_quark(), Gio.IOErrorEnum.CANCELLED)
def test_no_running_loop(self):
f = Gio.file_new_for_path("./")
res = f.enumerate_children_async("standard::*", 0, GLib.PRIORITY_DEFAULT)
self.assertIsNone(res)
def test_wrong_default_context(self):
f = Gio.file_new_for_path("./")
async def run(): # noqa: RUF029
nonlocal self
ctx = GLib.MainContext.new()
GLib.MainContext.push_thread_default(ctx)
self.addCleanup(GLib.MainContext.pop_thread_default, ctx)
res = f.enumerate_children_async("standard::*", 0, GLib.PRIORITY_DEFAULT)
self.assertIsNone(res)
self.loop.run_until_complete(run())
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