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python基于json文件实现的gearman任务自动重启代码实例

2019-08-13 11:10 1181 查看

一：在gearman任务失败后，调用task_failed

def task_failed(task, *args):
info = '\n'.join(args)
datetime = local_datetime()
text = '{} FAILED:\n{}\n当前响应worker已关闭\n{}\n-->【{}】'.format(task, info, datetime, task)
print(text)
check_frequency(task)

二：打印失败信息后，调用check_frequency检查任务5分钟内的重启次数

def check_frequency(task):
instance = TaskReloadMonitor()
now = time.time()
task_info = instance.open(task.lower())
if not task_info:
return
worker = task_info.get('worker')
last_time = task_info.get('last_time')
if not last_time:
task_info['timer'] = 1
task_info['last_time'] = now
instance.write()
task_reload(task, worker, task_info['timer'])
return
if int(now) - int(last_time) > 300:
task_info['timer'] = 1
task_info['last_time'] = now
instance.write()
task_reload(task, worker, task_info['timer'])
return
timer = task_info.get('timer')
if not (timer + 1 > 3):
task_info['timer'] = timer + 1
task_info['last_time'] = now
instance.write()
task_reload(task, worker, task_info['timer'])

三：确认重启任务后，利用subprocess重启任务，subprocess.Popen方法可以非阻塞运行cmd命令

def task_reload(task, worker, timer):
from coursepoints.settings import BASE_DIR
manage = os.path.join(BASE_DIR, 'manage.py')
datetime = local_datetime()
command = 'python {} {}'.format(manage, worker)
subprocess.Popen(command, shell=True)
text = '-->task reload:{}\n-->timer:{}\n-->{}'.format(task, timer, datetime)
print(text)

json文件读写

class TaskReloadMonitor():
def __init__(self):
pass
@property
def path(self):
path = Path(__file__).parent.joinpath('task.json')
return path
def open(self, task):
try:
f = open(self.path, 'r', encoding='utf8')
data = json.loads(f.read())
f.close()
self.task_data = data
task_info = data.get(task)
return task_info
except Exception as e:
print(e)
return None
def write(self):
try:
f = open(self.path, 'w', encoding='utf8')
data = json.dumps(self.task_data)
f.write(data)
f.close()
except Exception as e:
print(e)

json文件内容

{
"pptconvert": {
"worker": "pptconvert",
"timer": 1,
"last_time": 1555356612.9220166
},
"screencapture": {
"worker": "screencapture",
"timer": 0
},
"snapscreen": {
"worker": "snapscreen",
"timer": 1,
"last_time": 1555441223.166838
}
}

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标签： python json gearman 任务自动重启

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