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
|
# check ``hupper.compat.is_watchdog_supported`` before using this module
from __future__ import absolute_import
import os.path
import threading
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
from .interfaces import IFileMonitor
class WatchdogFileMonitor(FileSystemEventHandler, Observer, IFileMonitor):
"""
An :class:`hupper.interfaces.IFileMonitor` that uses ``watchdog``
to watch for file changes uses inotify.
``callback`` is a callable that accepts a path to a changed file.
"""
def __init__(self, callback):
super(WatchdogFileMonitor, self).__init__()
self.callback = callback
self.paths = set()
self.dirpaths = set()
self.lock = threading.Lock()
def add_path(self, path):
with self.lock:
dirpath = os.path.dirname(path)
if dirpath not in self.dirpaths:
try:
self.schedule(self, dirpath)
except (OSError, IOError): # pragma: no cover
# ideally we would handle this better but if the
# directory is missing watchdog raises an error
pass
else:
self.dirpaths.add(dirpath)
if path not in self.paths:
self.paths.add(path)
def on_any_event(self, event):
with self.lock:
path = event.src_path
if path in self.paths:
self.callback(path)
|
