需求:
避免同一个程序在不同时刻、终端并行执行;不是绝对不能,是两个同样的程序尽量不要一块执行;
技术:
在程序执行时将pid写入到一个文件里,结束时再删除pid文件,下一个程序先检查pid文件是否存在再决定是否提前终止;
python
import datetime
import shutil
from pathlib import Path
import logging
import os
# import fcntl
import psutil
from logging.handlers import RotatingFileHandler
LOG_PATH_PARENT = "./"
LOG_PATH = LOG_PATH_PARENT + "/log"
logger = logging.getLogger()
logger.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s [%(levelname)s] %(message)s')
log_abs_file = os.path.join(LOG_PATH_PARENT, 'suri_logrotate.log')
handler = RotatingFileHandler(log_abs_file, maxBytes=1024 * 1024 * 10, backupCount=10) # 大小10MB , 10个
handler.setFormatter(formatter)
logger.addHandler(handler)
console = logging.StreamHandler()
console.setFormatter(formatter)
logger.addHandler(console)
class SingletonProgress:
def _get_lock(self):
"""开启进程占用锁,确保其他同名称进程不再重复运行"""
# file_name = os.path.basename(__file__)
# lock_file_name = f"/var/run/{file_name}.pid"
# self.fd = open(self.lock_file_name, "w")
if not os.path.exists(self.lock_file_name):
with open(self.lock_file_name, "w", encoding='utf-8') as f:
f.write(str(os.getpid()))
else:
if os.path.exists(self.lock_file_name):
print(self.lock_file_name)
with open(self.lock_file_name, 'r', encoding='utf8') as f:
pid = f.read().strip()
if not pid:
logger.error("Program abnormal exit,no pid, Please try again.")
os.remove(self.lock_file_name)
elif pid and pid.isdigit() and int(pid) not in psutil.pids():
logger.error("Program abnormal exit,pid err, Please try again.")
os.remove(self.lock_file_name)
elif self.file_name not in psutil.Process(int(pid)).cmdline():
logger.error("Program abnormal exit,pid not, Please try again.")
os.remove(self.lock_file_name)
else:
logger.info(f"{self.file_name} have another instance running.")
self.remove_lock_file = False
exit(1)
def __init__(self):
self.file_name = os.path.basename(__file__)
self.lock_file_name = os.path.join(LOG_PATH_PARENT, self.file_name+'.pid')
self.remove_lock_file = True
self.err_delete_lock_file_name = False
self._get_lock()
def __del__(self):
# 占用锁的进程被关闭后,释放锁
if self.remove_lock_file:
os.remove(self.lock_file_name)
def method():
import time
while 1:
time.sleep(1)
logger.info(str(os.getpid()))
if __name__ == '__main__':
keep_lock = SingletonProgress()
method()
# del keep_lock