Varia's website
https://varia.zone
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
354 lines
14 KiB
354 lines
14 KiB
5 days ago
|
import logging
|
||
|
|
import os
|
||
|
|
import sys
|
||
|
|
import warnings
|
||
|
|
from enum import IntEnum
|
||
|
|
from pathlib import Path
|
||
|
|
from typing import TYPE_CHECKING, AsyncGenerator, Callable, Generator, Optional, Set, Tuple, Union
|
||
|
|
|
||
|
|
import anyio
|
||
|
|
|
||
|
|
from ._rust_notify import RustNotify
|
||
|
|
from .filters import DefaultFilter
|
||
|
|
|
||
|
|
__all__ = 'watch', 'awatch', 'Change', 'FileChange'
|
||
|
|
logger = logging.getLogger('watchfiles.main')
|
||
|
|
|
||
|
|
|
||
|
|
class Change(IntEnum):
|
||
|
|
"""
|
||
|
|
Enum representing the type of change that occurred.
|
||
|
|
"""
|
||
|
|
|
||
|
|
added = 1
|
||
|
|
"""A new file or directory was added."""
|
||
|
|
modified = 2
|
||
|
|
"""A file or directory was modified, can be either a metadata or data change."""
|
||
|
|
deleted = 3
|
||
|
|
"""A file or directory was deleted."""
|
||
|
|
|
||
|
|
def raw_str(self) -> str:
|
||
|
|
return self.name
|
||
|
|
|
||
|
|
|
||
|
|
FileChange = Tuple[Change, str]
|
||
|
|
"""
|
||
|
|
A tuple representing a file change, first element is a [`Change`][watchfiles.Change] member, second is the path
|
||
|
|
of the file or directory that changed.
|
||
|
|
"""
|
||
|
|
|
||
|
|
if TYPE_CHECKING:
|
||
|
|
import asyncio
|
||
|
|
from typing import Protocol
|
||
|
|
|
||
|
|
import trio
|
||
|
|
|
||
|
|
AnyEvent = Union[anyio.Event, asyncio.Event, trio.Event]
|
||
|
|
|
||
|
|
class AbstractEvent(Protocol):
|
||
|
|
def is_set(self) -> bool: ...
|
||
|
|
|
||
|
|
|
||
|
|
def watch(
|
||
|
|
*paths: Union[Path, str],
|
||
|
|
watch_filter: Optional[Callable[['Change', str], bool]] = DefaultFilter(),
|
||
|
|
debounce: int = 1_600,
|
||
|
|
step: int = 50,
|
||
|
|
stop_event: Optional['AbstractEvent'] = None,
|
||
|
|
rust_timeout: int = 5_000,
|
||
|
|
yield_on_timeout: bool = False,
|
||
|
|
debug: Optional[bool] = None,
|
||
|
|
raise_interrupt: bool = True,
|
||
|
|
force_polling: Optional[bool] = None,
|
||
|
|
poll_delay_ms: int = 300,
|
||
|
|
recursive: bool = True,
|
||
|
|
ignore_permission_denied: Optional[bool] = None,
|
||
|
|
) -> Generator[Set[FileChange], None, None]:
|
||
|
|
"""
|
||
|
|
Watch one or more paths and yield a set of changes whenever files change.
|
||
|
|
|
||
|
|
The paths watched can be directories or files, directories are watched recursively - changes in subdirectories
|
||
|
|
are also detected.
|
||
|
|
|
||
|
|
#### Force polling
|
||
|
|
|
||
|
|
Notify will fall back to file polling if it can't use file system notifications, but we also force Notify
|
||
|
|
to use polling if the `force_polling` argument is `True`; if `force_polling` is unset (or `None`), we enable
|
||
|
|
force polling thus:
|
||
|
|
|
||
|
|
* if the `WATCHFILES_FORCE_POLLING` environment variable exists and is not empty:
|
||
|
|
* if the value is `false`, `disable` or `disabled`, force polling is disabled
|
||
|
|
* otherwise, force polling is enabled
|
||
|
|
* otherwise, we enable force polling only if we detect we're running on WSL (Windows Subsystem for Linux)
|
||
|
|
|
||
|
|
Args:
|
||
|
|
*paths: filesystem paths to watch.
|
||
|
|
watch_filter: callable used to filter out changes which are not important, you can either use a raw callable
|
||
|
|
or a [`BaseFilter`][watchfiles.BaseFilter] instance,
|
||
|
|
defaults to an instance of [`DefaultFilter`][watchfiles.DefaultFilter]. To keep all changes, use `None`.
|
||
|
|
debounce: maximum time in milliseconds to group changes over before yielding them.
|
||
|
|
step: time to wait for new changes in milliseconds, if no changes are detected in this time, and
|
||
|
|
at least one change has been detected, the changes are yielded.
|
||
|
|
stop_event: event to stop watching, if this is set, the generator will stop iteration,
|
||
|
|
this can be anything with an `is_set()` method which returns a bool, e.g. `threading.Event()`.
|
||
|
|
rust_timeout: maximum time in milliseconds to wait in the rust code for changes, `0` means no timeout.
|
||
|
|
yield_on_timeout: if `True`, the generator will yield upon timeout in rust even if no changes are detected.
|
||
|
|
debug: whether to print information about all filesystem changes in rust to stdout, if `None` will use the
|
||
|
|
`WATCHFILES_DEBUG` environment variable.
|
||
|
|
raise_interrupt: whether to re-raise `KeyboardInterrupt`s, or suppress the error and just stop iterating.
|
||
|
|
force_polling: See [Force polling](#force-polling) above.
|
||
|
|
poll_delay_ms: delay between polling for changes, only used if `force_polling=True`.
|
||
|
|
recursive: if `True`, watch for changes in sub-directories recursively, otherwise watch only for changes in the
|
||
|
|
top-level directory, default is `True`.
|
||
|
|
ignore_permission_denied: if `True`, will ignore permission denied errors, otherwise will raise them by default.
|
||
|
|
Setting the `WATCHFILES_IGNORE_PERMISSION_DENIED` environment variable will set this value too.
|
||
|
|
|
||
|
|
Yields:
|
||
|
|
The generator yields sets of [`FileChange`][watchfiles.main.FileChange]s.
|
||
|
|
|
||
|
|
```py title="Example of watch usage"
|
||
|
|
from watchfiles import watch
|
||
|
|
|
||
|
|
for changes in watch('./first/dir', './second/dir', raise_interrupt=False):
|
||
|
|
print(changes)
|
||
|
|
```
|
||
|
|
"""
|
||
|
|
force_polling = _default_force_polling(force_polling)
|
||
|
|
ignore_permission_denied = _default_ignore_permission_denied(ignore_permission_denied)
|
||
|
|
debug = _default_debug(debug)
|
||
|
|
with RustNotify(
|
||
|
|
[str(p) for p in paths], debug, force_polling, poll_delay_ms, recursive, ignore_permission_denied
|
||
|
|
) as watcher:
|
||
|
|
while True:
|
||
|
|
raw_changes = watcher.watch(debounce, step, rust_timeout, stop_event)
|
||
|
|
if raw_changes == 'timeout':
|
||
|
|
if yield_on_timeout:
|
||
|
|
yield set()
|
||
|
|
else:
|
||
|
|
logger.debug('rust notify timeout, continuing')
|
||
|
|
elif raw_changes == 'signal':
|
||
|
|
if raise_interrupt:
|
||
|
|
raise KeyboardInterrupt
|
||
|
|
else:
|
||
|
|
logger.warning('KeyboardInterrupt caught, stopping watch')
|
||
|
|
return
|
||
|
|
elif raw_changes == 'stop':
|
||
|
|
return
|
||
|
|
else:
|
||
|
|
changes = _prep_changes(raw_changes, watch_filter)
|
||
|
|
if changes:
|
||
|
|
_log_changes(changes)
|
||
|
|
yield changes
|
||
|
|
else:
|
||
|
|
logger.debug('all changes filtered out, raw_changes=%s', raw_changes)
|
||
|
|
|
||
|
|
|
||
|
|
async def awatch( # C901
|
||
|
|
*paths: Union[Path, str],
|
||
|
|
watch_filter: Optional[Callable[[Change, str], bool]] = DefaultFilter(),
|
||
|
|
debounce: int = 1_600,
|
||
|
|
step: int = 50,
|
||
|
|
stop_event: Optional['AnyEvent'] = None,
|
||
|
|
rust_timeout: Optional[int] = None,
|
||
|
|
yield_on_timeout: bool = False,
|
||
|
|
debug: Optional[bool] = None,
|
||
|
|
raise_interrupt: Optional[bool] = None,
|
||
|
|
force_polling: Optional[bool] = None,
|
||
|
|
poll_delay_ms: int = 300,
|
||
|
|
recursive: bool = True,
|
||
|
|
ignore_permission_denied: Optional[bool] = None,
|
||
|
|
) -> AsyncGenerator[Set[FileChange], None]:
|
||
|
|
"""
|
||
|
|
Asynchronous equivalent of [`watch`][watchfiles.watch] using threads to wait for changes.
|
||
|
|
Arguments match those of [`watch`][watchfiles.watch] except `stop_event`.
|
||
|
|
|
||
|
|
All async methods use [anyio](https://anyio.readthedocs.io/en/latest/) to run the event loop.
|
||
|
|
|
||
|
|
Unlike [`watch`][watchfiles.watch] `KeyboardInterrupt` cannot be suppressed by `awatch` so they need to be caught
|
||
|
|
where `asyncio.run` or equivalent is called.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
*paths: filesystem paths to watch.
|
||
|
|
watch_filter: matches the same argument of [`watch`][watchfiles.watch].
|
||
|
|
debounce: matches the same argument of [`watch`][watchfiles.watch].
|
||
|
|
step: matches the same argument of [`watch`][watchfiles.watch].
|
||
|
|
stop_event: `anyio.Event` which can be used to stop iteration, see example below.
|
||
|
|
rust_timeout: matches the same argument of [`watch`][watchfiles.watch], except that `None` means
|
||
|
|
use `1_000` on Windows and `5_000` on other platforms thus helping with exiting on `Ctrl+C` on Windows,
|
||
|
|
see [#110](https://github.com/samuelcolvin/watchfiles/issues/110).
|
||
|
|
yield_on_timeout: matches the same argument of [`watch`][watchfiles.watch].
|
||
|
|
debug: matches the same argument of [`watch`][watchfiles.watch].
|
||
|
|
raise_interrupt: This is deprecated, `KeyboardInterrupt` will cause this coroutine to be cancelled and then
|
||
|
|
be raised by the top level `asyncio.run` call or equivalent, and should be caught there.
|
||
|
|
See [#136](https://github.com/samuelcolvin/watchfiles/issues/136)
|
||
|
|
force_polling: if true, always use polling instead of file system notifications, default is `None` where
|
||
|
|
`force_polling` is set to `True` if the `WATCHFILES_FORCE_POLLING` environment variable exists.
|
||
|
|
poll_delay_ms: delay between polling for changes, only used if `force_polling=True`.
|
||
|
|
recursive: if `True`, watch for changes in sub-directories recursively, otherwise watch only for changes in the
|
||
|
|
top-level directory, default is `True`.
|
||
|
|
ignore_permission_denied: if `True`, will ignore permission denied errors, otherwise will raise them by default.
|
||
|
|
Setting the `WATCHFILES_IGNORE_PERMISSION_DENIED` environment variable will set this value too.
|
||
|
|
|
||
|
|
Yields:
|
||
|
|
The generator yields sets of [`FileChange`][watchfiles.main.FileChange]s.
|
||
|
|
|
||
|
|
```py title="Example of awatch usage"
|
||
|
|
import asyncio
|
||
|
|
from watchfiles import awatch
|
||
|
|
|
||
|
|
async def main():
|
||
|
|
async for changes in awatch('./first/dir', './second/dir'):
|
||
|
|
print(changes)
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
try:
|
||
|
|
asyncio.run(main())
|
||
|
|
except KeyboardInterrupt:
|
||
|
|
print('stopped via KeyboardInterrupt')
|
||
|
|
```
|
||
|
|
|
||
|
|
```py title="Example of awatch usage with a stop event"
|
||
|
|
import asyncio
|
||
|
|
from watchfiles import awatch
|
||
|
|
|
||
|
|
async def main():
|
||
|
|
stop_event = asyncio.Event()
|
||
|
|
|
||
|
|
async def stop_soon():
|
||
|
|
await asyncio.sleep(3)
|
||
|
|
stop_event.set()
|
||
|
|
|
||
|
|
stop_soon_task = asyncio.create_task(stop_soon())
|
||
|
|
|
||
|
|
async for changes in awatch('/path/to/dir', stop_event=stop_event):
|
||
|
|
print(changes)
|
||
|
|
|
||
|
|
# cleanup by awaiting the (now complete) stop_soon_task
|
||
|
|
await stop_soon_task
|
||
|
|
|
||
|
|
asyncio.run(main())
|
||
|
|
```
|
||
|
|
"""
|
||
|
|
if raise_interrupt is not None:
|
||
|
|
warnings.warn(
|
||
|
|
'raise_interrupt is deprecated, KeyboardInterrupt will cause this coroutine to be cancelled and then '
|
||
|
|
'be raised by the top level asyncio.run call or equivalent, and should be caught there. See #136.',
|
||
|
|
DeprecationWarning,
|
||
|
|
)
|
||
|
|
|
||
|
|
if stop_event is None:
|
||
|
|
stop_event_: 'AnyEvent' = anyio.Event()
|
||
|
|
else:
|
||
|
|
stop_event_ = stop_event
|
||
|
|
|
||
|
|
force_polling = _default_force_polling(force_polling)
|
||
|
|
ignore_permission_denied = _default_ignore_permission_denied(ignore_permission_denied)
|
||
|
|
debug = _default_debug(debug)
|
||
|
|
with RustNotify(
|
||
|
|
[str(p) for p in paths], debug, force_polling, poll_delay_ms, recursive, ignore_permission_denied
|
||
|
|
) as watcher:
|
||
|
|
timeout = _calc_async_timeout(rust_timeout)
|
||
|
|
CancelledError = anyio.get_cancelled_exc_class()
|
||
|
|
|
||
|
|
while True:
|
||
|
|
async with anyio.create_task_group() as tg:
|
||
|
|
try:
|
||
|
|
raw_changes = await anyio.to_thread.run_sync(watcher.watch, debounce, step, timeout, stop_event_)
|
||
|
|
except (CancelledError, KeyboardInterrupt):
|
||
|
|
stop_event_.set()
|
||
|
|
# suppressing KeyboardInterrupt wouldn't stop it getting raised by the top level asyncio.run call
|
||
|
|
raise
|
||
|
|
tg.cancel_scope.cancel()
|
||
|
|
|
||
|
|
if raw_changes == 'timeout':
|
||
|
|
if yield_on_timeout:
|
||
|
|
yield set()
|
||
|
|
else:
|
||
|
|
logger.debug('rust notify timeout, continuing')
|
||
|
|
elif raw_changes == 'stop':
|
||
|
|
return
|
||
|
|
elif raw_changes == 'signal':
|
||
|
|
# in theory the watch thread should never get a signal
|
||
|
|
raise RuntimeError('watch thread unexpectedly received a signal')
|
||
|
|
else:
|
||
|
|
changes = _prep_changes(raw_changes, watch_filter)
|
||
|
|
if changes:
|
||
|
|
_log_changes(changes)
|
||
|
|
yield changes
|
||
|
|
else:
|
||
|
|
logger.debug('all changes filtered out, raw_changes=%s', raw_changes)
|
||
|
|
|
||
|
|
|
||
|
|
def _prep_changes(
|
||
|
|
raw_changes: Set[Tuple[int, str]], watch_filter: Optional[Callable[[Change, str], bool]]
|
||
|
|
) -> Set[FileChange]:
|
||
|
|
# if we wanted to be really snazzy, we could move this into rust
|
||
|
|
changes = {(Change(change), path) for change, path in raw_changes}
|
||
|
|
if watch_filter:
|
||
|
|
changes = {c for c in changes if watch_filter(c[0], c[1])}
|
||
|
|
return changes
|
||
|
|
|
||
|
|
|
||
|
|
def _log_changes(changes: Set[FileChange]) -> None:
|
||
|
|
if logger.isEnabledFor(logging.INFO): # pragma: no branch
|
||
|
|
count = len(changes)
|
||
|
|
plural = '' if count == 1 else 's'
|
||
|
|
if logger.isEnabledFor(logging.DEBUG):
|
||
|
|
logger.debug('%d change%s detected: %s', count, plural, changes)
|
||
|
|
else:
|
||
|
|
logger.info('%d change%s detected', count, plural)
|
||
|
|
|
||
|
|
|
||
|
|
def _calc_async_timeout(timeout: Optional[int]) -> int:
|
||
|
|
"""
|
||
|
|
see https://github.com/samuelcolvin/watchfiles/issues/110
|
||
|
|
"""
|
||
|
|
if timeout is None:
|
||
|
|
if sys.platform == 'win32':
|
||
|
|
return 1_000
|
||
|
|
else:
|
||
|
|
return 5_000
|
||
|
|
else:
|
||
|
|
return timeout
|
||
|
|
|
||
|
|
|
||
|
|
def _default_force_polling(force_polling: Optional[bool]) -> bool:
|
||
|
|
"""
|
||
|
|
See docstring for `watch` above for details.
|
||
|
|
|
||
|
|
See samuelcolvin/watchfiles#167 and samuelcolvin/watchfiles#187 for discussion and rationale.
|
||
|
|
"""
|
||
|
|
if force_polling is not None:
|
||
|
|
return force_polling
|
||
|
|
env_var = os.getenv('WATCHFILES_FORCE_POLLING')
|
||
|
|
if env_var:
|
||
|
|
return env_var.lower() not in {'false', 'disable', 'disabled'}
|
||
|
|
else:
|
||
|
|
return _auto_force_polling()
|
||
|
|
|
||
|
|
|
||
|
|
def _default_debug(debug: Optional[bool]) -> bool:
|
||
|
|
if debug is not None:
|
||
|
|
return debug
|
||
|
|
env_var = os.getenv('WATCHFILES_DEBUG')
|
||
|
|
return bool(env_var)
|
||
|
|
|
||
|
|
|
||
|
|
def _auto_force_polling() -> bool:
|
||
|
|
"""
|
||
|
|
Whether to auto-enable force polling, it should be enabled automatically only on WSL.
|
||
|
|
|
||
|
|
See samuelcolvin/watchfiles#187 for discussion.
|
||
|
|
"""
|
||
|
|
import platform
|
||
|
|
|
||
|
|
uname = platform.uname()
|
||
|
|
return 'microsoft-standard' in uname.release.lower() and uname.system.lower() == 'linux'
|
||
|
|
|
||
|
|
|
||
|
|
def _default_ignore_permission_denied(ignore_permission_denied: Optional[bool]) -> bool:
|
||
|
|
if ignore_permission_denied is not None:
|
||
|
|
return ignore_permission_denied
|
||
|
|
env_var = os.getenv('WATCHFILES_IGNORE_PERMISSION_DENIED')
|
||
|
|
return bool(env_var)
|