Python 实时获取任务请求对应的Nginx日志的方法

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


'''
@CreateTime: 2021/06/26 9:05
@Author : shouke
'''


import time
import threading
import subprocess
from collections import deque


def collect_nginx_log():
    global nginx_log_queue
    global is_tasks_compete
    global task_status


    args = 'tail -0f /usr/local/openresty/nginx/logs/access.log'
    while task_status != 'req_log_got':
        with subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True, universal_newlines = True) as proc:
            log_for_req = ''
            outs, errs = '', ''

            try:
                outs, errs = proc.communicate(timeout=2)
            except subprocess.TimeoutExpired:
                print('获取nginx日志超时，正在重试')
                proc.kill()
                try:
                    outs, errs = proc.communicate(timeout=5)
                except subprocess.TimeoutExpired:
                    print('获取nginx日志超时，再次超时，停止重试')
                    break
            finally:
                for line in outs.split('\n'):
                    flag = '\"client_ip\":\"10.118.0.77\"' # 特征
                    if flag in line: # 查找包含特征内容的日志
                        log_for_req += line

                if task_status == 'req_finished':
                    nginx_log_queue.append(log_for_req)
                    task_status = 'req_log_got'



def run_tasks(task_list):
    '''
    运行任务
    :param task_list 任务列表
    '''

    global nginx_log_queue
    global is_tasks_compete
    global task_status


    for task in task_list:
        thread = threading.Thread(target=collect_nginx_log,
                                    name="collect_nginx_log")
        thread.start()
        time.sleep(1) # 执行任务前，让收集日志线程先做好准备

        print('正在执行任务：%s' % task.get('name'))

        # 执行Nginx任务请求
        # ...

        task_status = 'req_finished'
        time_to_wait = 0.1
        while task_status != 'req_log_got': # 请求触发的nginx日志收集未完成
            time.sleep(time_to_wait)
            time_to_wait += 0.01
        else:# 获取到用例请求触发的nginx日志
            if nginx_log_queue:
                nginx_log = nginx_log_queue.popleft()
                task_status = 'req_ready'
                # 解析日志
                # do something here
                # ...
            else:
                print('存储请求日志的队列为空')
                # do something here
                # ...


if __name__ == '__main__':
    nginx_log_queue = deque()
    is_tasks_compete = False # 所有任务是否执行完成

    task_status = 'req_ready' # req_ready，req_finished，req_log_got  # 存放执行次任务任务的一些状态
    print('###########################任务开始###########################')

    tast_list = [{'name':'test_task', 'other':'...'}]
    run_tasks(tast_list)

    is_tasks_compete = True

    current_active_thread_num = len(threading.enumerate())
    while current_active_thread_num != 1:
        time.sleep(2)
        current_active_thread_num = len(threading.enumerate())
    print('###########################任务完成###########################')