python3 监控代码变化自动重启提高开发效率

最新推荐文章于 2021-05-28 10:09:36 发布

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最新推荐文章于 2021-05-28 10:09:36 发布

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CC 4.0 BY-SA版权

文章标签： python

原文链接：http://www.cnblogs.com/xielisen/p/6867463.html

本文介绍了一个使用Python编写的简单脚本，该脚本能监控指定目录下的Python源文件变化，并在检测到文件变动时自动重启指定的Python进程。这对于开发过程中频繁修改代码并希望实时查看效果的场景非常有用。

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-

__author__ = 'Michael Liao'

import os, sys, time, subprocess

from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler

def log(s):
    print('[Monitor] %s' % s)

class MyFileSystemEventHander(FileSystemEventHandler):

    def __init__(self, fn):
        super(MyFileSystemEventHander, self).__init__()
        self.restart = fn

    def on_any_event(self, event):
        if event.src_path.endswith('.py'):
            log('Python source file changed: %s' % event.src_path)
            self.restart()

command = ['echo', 'ok']
process = None

def kill_process():
    global process
    if process:
        log('Kill process [%s]...' % process.pid)
        process.kill()
        process.wait()
        log('Process ended with code %s.' % process.returncode)
        process = None

def start_process():
    global process, command
    log('Start process %s...' % ' '.join(command))
    process = subprocess.Popen(command, stdin=sys.stdin, stdout=sys.stdout, stderr=sys.stderr)

def restart_process():
    kill_process()
    start_process()

def start_watch(path, callback):
    observer = Observer()
    observer.schedule(MyFileSystemEventHander(restart_process), path, recursive=True)
    observer.start()
    log('Watching directory %s...' % path)
    start_process()
    try:
        while True:
            time.sleep(0.5)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()

if __name__ == '__main__':
    argv = sys.argv[1:]
    if not argv:
        print('Usage: ./pymonitor your-script.py')
        exit(0)
    if argv[0] != 'python3':
        argv.insert(0, 'python3')
    command = argv
    path = os.path.abspath('.')
    start_watch(path, None)