Module retry

Call a function repeatedly until it succeeds.

The function fn is called repeatedly until it doesn't throw RetryAgain anymore. Between calls a delay, specified by delay, is inserted. After a total of timeout seconds, this function throws RetryTimeout.

delay can be one of the following:

• callable returning the delay length as a float
• Tuple of (start, factor, limit)
• RETRY_REMAINING_TIME to sleep until the timeout expires (this is useful when overriding wait_fn to wait for an external event)
• A static delay as a number (int or float)

Parameters:

• fn (callable) - Function to be called
• delay - Either a callable (returning the delay), a tuple of (start, factor, limit) (see _RetryDelayCalculator), RETRY_REMAINING_TIME or a number (int or float)
• timeout (float) - Total timeout
• wait_fn (callable) - Waiting function

Returns:

Return value of function