gistfile1.py

#! /usr/bin/env python
# -*- coding: utf-8 -*-

from twisted.trial import unittest
from twisted.python.filepath import FilePath
from twisted.internet import inotify
from twisted.python import filepath

from abc import ABCMeta, abstractmethod
from tempfile import mkdtemp, mkstemp
from os.path import join


def humanizeMask(fn):
    def wrap(_, filepath, mask):
        return fn(filepath, inotify.humanReadableMask(mask))
    return wrap


class AbstractMonitor(object):
    __metaclass__ = ABCMeta
    def __init__(self, path):
        self.filepath = filepath.FilePath(path)

        notifier = inotify.INotify()
        notifier.startReading()
        notifier.watch(self.filepath,
            callbacks=[
                humanizeMask(self.event)
            ])

        self.notifier = notifier

    @abstractmethod
    def event(self, fp, mask):
        """
            @param fp L{twisted.filepath.FilePath}
            @param mask str L{twisted.internet.inotify.humanReadableMask}
        """

class MaildirMonitor(AbstractMonitor):
    def event(self, fp, mask):
        if 'modify' in mask:
            pass

################

class CrashTest(object):
    def test_does_not_crash(self):
        monitor = self.klass(self.path)

        if monitor.filepath.isdir():
            target = FilePath(join(monitor.filepath.path, 'random'))
        elif monitor.filepath.isfile():
            target = monitor.filepath
        else:
            raise ValueError()

        target.open("w").write("random crap")
        self.monitor = monitor

    def tearDown(self):
        self.monitor.notifier.loseConnection()


class TestMaildirMonitor(unittest.TestCase, CrashTest):
    klass = MaildirMonitor
    path = mkdtemp()