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(CkPython) Cancel HTTP Get Async Task if not Completed after a Max TimeDemonstrates how to wait a maximum amount of time for an asynchronous task to completed. If not completed in the allotted amount of time, the task is cancelled.
import chilkat # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. http = chilkat.CkHttp() # Set some timeouts, in seconds: http.put_ConnectTimeout(15) # ReadTimeout specifies the max number of seconds that must elapse when no additional data is received before # timing out. For example, if a server sends a 300 byte response at the rate of 1 byte per second, then # ReadTimeout would never cause a timeout because there is never a 15 second interval when nothing arrives. http.put_ReadTimeout(15) url = "https://your-url.com/something" # task is a CkTask task = http.QuickGetStrAsync(url) task.Run() # Wait a maximum of waitMaxMs for the task (i.e. the HTTP GET) to complete. # The Wait method returns when the task has been canceled, aborted, or completed, or when the max allotted time has passed. waitMaxMs = 20000 task.Wait(waitMaxMs) # At this point, the GET may or may not have completed. # Rather than checking the Task status, we can call task.Cancel because # if the Task is no longer running (because it already completed, was canceled or aborted), then the # call to Cancel is a NO-OP (meaning it does nothing and the Task's status is unaffected). # Also, task.Cancel returns True if the task was in the "queued" or "running" state and was canceled or aborted. # The method returns False if the task has any other status. wasCanceled = task.Cancel() if (wasCanceled == True): print("The HTTP GET took too long and was canceled.") else: # Find out what happened. if (task.get_StatusInt() == 7): # The task completed, which means the background thread's call to QuickGetStr completed # with success or failure. Find out which... if (task.get_TaskSuccess() == True): # Get the string response for the call to QuickGetStr (which happened in Chilkat's background thread). responseStr = task.getResultString() print(responseStr) print("HTTP GET successful!") else: print("HTTP GET failed prior to waitMaxMs...") print(task.resultErrorText()) else: # The task must've been canceled or aborted by some other means.. print("Task did not complete. Final status: " + task.status()) |
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