前言

最近项目中遇到一个用于监控日志文件的Python包pyinotify，结合自己的项目经验和网上的一些资料总结一下，总的原理是利用pyinotify模块监控日志文件夹，当日志到来的情况下，触发相应的函数进行处理，处理完毕后删除日志文件的过程，下面就着重介绍下pyinotify

pyinotify

Pyinotify是一个Python模块，用来监测文件系统的变化。 Pyinotify依赖于Linux内核的功能—inotify（内核2.6.13合并）。 inotify的是一个事件驱动的通知器，其通知接口通过三个系统调用从内核空间到用户空间。pyinotify结合这些系统调用，并提供一个顶级的抽象和一个通用的方式来处理这些功能。

1. pyinotify 说百了就是通过 调用系统的inotify来实现通知的
2. inotify 既可以监视文件，也可以监视目录
3. Inotify 使用系统调用而非 SIGIO 来通知文件系统事件。

Inotify 可以监视的文件系统事件包括：

Event Name Is an Event Description IN_ACCESS Yes file was accessed. IN_ATTRIB Yes metadata changed. IN_CLOSE_NOWRITE Yes unwrittable file was closed. IN_CLOSE_WRITE Yes writtable file was closed. IN_CREATE Yes file/dir was created in watched directory. IN_DELETE Yes file/dir was deleted in watched directory. IN_DELETE_SELF Yes 自删除，即一个可执行文件在执行时删除自己 IN_DONT_FOLLOW No don't follow a symlink (lk 2.6.15). IN_IGNORED Yes raised on watched item removing. Probably useless for you, prefer instead IN_DELETE*. IN_ISDIR No event occurred against directory. It is always piggybacked to an event. The Event structure automatically provide this information (via .is_dir) IN_MASK_ADD No to update a mask without overwriting the previous value (lk 2.6.14). Useful when updating a watch. IN_MODIFY Yes file was modified. IN_MOVE_SELF Yes 自移动，即一个可执行文件在执行时移动自己 IN_MOVED_FROM Yes file/dir in a watched dir was moved from X. Can trace the full move of an item when IN_MOVED_TO is available too, in this case if the moved item is itself watched, its path will be updated (see IN_MOVE_SELF). IN_MOVED_TO Yes file/dir was moved to Y in a watched dir (see IN_MOVE_FROM). IN_ONLYDIR No only watch the path if it is a directory (lk 2.6.15). Usable when calling .add_watch. IN_OPEN Yes file was opened. IN_Q_OVERFLOW Yes event queued overflowed. This event doesn't belongs to any particular watch. IN_UNMOUNT Yes 宿主文件系统被 umount

IN_ACCESS，即文件被访问

IN_MODIFY，文件被write

IN_ATTRIB，文件属性被修改，如chmod、chown、touch等

IN_CLOSE_WRITE，可写文件被close

IN_CLOSE_NOWRITE，不可写文件被close

IN_OPEN，文件被open

IN_MOVED_FROM，文件被移走,如mv

IN_MOVED_TO，文件被移来，如mv、cp

IN_CREATE，创建新文件

IN_DELETE，文件被删除，如rm

IN_DELETE_SELF，自删除，即一个可执行文件在执行时删除自己

IN_MOVE_SELF，自移动，即一个可执行文件在执行时移动自己

IN_UNMOUNT，宿主文件系统被umount

IN_CLOSE，文件被关闭，等同于(IN_CLOSE_WRITE | IN_CLOSE_NOWRITE)

IN_MOVE，文件被移动，等同于(IN_MOVED_FROM | IN_MOVED_TO)

pyinotify使用例子

#!/usr/bin/python
# coding:utf-8
import os
from pyinotify import WatchManager, Notifier,ProcessEvent,IN_DELETE, IN_CREATE,IN_MODIFY
class EventHandler(ProcessEvent):

 """事件处理"""
 def process_IN_CREATE(self, event):
 print "Create file: %s " % os.path.join(event.path,event.name)

 def process_IN_DELETE(self, event):
 print "Delete file: %s " % os.path.join(event.path,event.name)

 def process_IN_MODIFY(self, event):
 print "Modify file: %s " % os.path.join(event.path,event.name)
 

def FSMonitor(path='.'):
 wm = WatchManager() 
 mask = IN_DELETE | IN_CREATE |IN_MODIFY
 notifier = Notifier(wm, EventHandler())
 wm.add_watch(path, mask,auto_add=True,rec=True)
 print 'now starting monitor %s'%(path)
 while True:
 try:
  notifier.process_events()
  if notifier.check_events():
  notifier.read_events()
 except KeyboardInterrupt:
  notifier.stop()
  break
if __name__ == "__main__":
 FSMonitor('/root/softpython/apk_url') 

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