Google App Engine任务截止日期

Question

有没有办法在执行任务时处理任何软截止日期？执行10分钟后抛出DeadlineExceededError,之后几秒钟我就会做一些事情.我想在任务终止之前清理一些事情并创建一个新任务.这可能需要几秒钟.有没有办法通过捕获大约9分钟的任何异常来做到这一点.我知道我可以在9分钟后手动抛出异常.但这可以由GAE自动完成吗？

class FillMtxHandler():

def post(self,index,user,seqlen):

    try :           
        FillMtx(index,user,seqlen)

    except DeadlineExceededError:

        deferred.defer(self.post,index,user,seqlen)

以上是我的代码.index是一个列表,从0开始.它将在FillMtx中递增.一旦超过截止日期,就会抛出错误,我想继续从索引最后增加的位置开始.我收到以下错误

   The API call taskqueue.BulkAdd() was explicitly cancelled.
Traceback (most recent call last):
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 517, in __call__
    handler.post(*groups)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/deferred/deferred.py", line 258, in post
    run(self.request.body)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/deferred/deferred.py", line 124, in run
    return func(*args, **kwds)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/deferred/deferred.py", line 166, in invoke_member
    return getattr(obj, membername)(*args, **kwargs)
  File "/base/data/home/apps/0xxopdp/3.347813391084738922/fillmtx.py", line 204, in post
    deferred.defer(self.post,index,user,seqlen)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/deferred/deferred.py", line 241, in defer
    return task.add(queue, transactional=transactional)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/api/taskqueue/taskqueue.py", line 688, in add
    return Queue(queue_name).add(self, transactional=transactional)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/api/taskqueue/taskqueue.py", line 744, in add
    self.__AddTasks(tasks, transactional)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/api/taskqueue/taskqueue.py", line 770, in __AddTasks
    apiproxy_stub_map.MakeSyncCall('taskqueue', 'BulkAdd', request, response)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/api/apiproxy_stub_map.py", line 86, in MakeSyncCall
    return stubmap.MakeSyncCall(service, call, request, response)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/api/apiproxy_stub_map.py", line 286, in MakeSyncCall
    rpc.CheckSuccess()
  File "/base/python_runtime/python_lib/versions/1/google/appengine/api/apiproxy_rpc.py", line 126, in CheckSuccess
    raise self.exception
CancelledError: The API call taskqueue.BulkAdd() was explicitly cancelled.

我发现已创建一个新任务并排队等候.但是为什么GAE仍然会抛出这个错误？

Answer 1

您无法控制何时收到软截止日期超出错误。相反，您应该使用自己的计时器（在开始时获取挂钟时间，并将其与主循环每次行程的当前时间进行比较），并在足够接近要停止的限制时中止。