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FollowTail.py
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FollowTail.py
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from twisted.internet.task import LoopingCall
from os import stat, fstat, path
class FollowTail:
fileObj = None
def __init__(self, filename, callback, *a, **kw):
self.filename = filename
assert path.exists(filename)
self.lc = LoopingCall(self.check)
self.callback = callback
self.a, self.kw = a, kw
def start(self, checkFreq = 0.5):
self.fileObj = open(self.filename)
self.fileObj.seek(0, 2)
self.lc.start(checkFreq)
def check(self):
obj, callback, a, kw = self.fileObj, self.callback, self.a, self.kw
obj.seek(obj.tell())
for line in obj:
line = line.strip()
callback(line, self.filename, *a, **kw)
def stop(self):
if self.lc.running:
self.lc.stop()
if self.fileObj:
self.fileObj.close()
self.fileObj = None
class ChainCallback:
def __init__(self, *callbacks):
self.callbacks = list(callbacks)
def __call__(self, *a, **kw):
for callback in self.callbacks:
callback(*a, **kw)
def addCallback(self, callback):
self.callbacks.append(callback)
def removeCallback(self, callback):
if callback in self.callbacks:
self.callbacks.remove(callback)