def retry(self,
max_tries=3,
wait_time=1,
reason='',
backoff=lambda x, y: x):
"""Retries and begin again from the beginning.
:param max_tries: number of maximum retries
:param wait_time: time to wait in seconds
:param reason: reason for retrying, will be passed to fail if max_tries reached
:param backoff: Function to backoff the wait time, takes initial time and number of retry as argument.
defaults to no backoff / fixed wait time
"""
if 0 < max_tries <= self.retries:
if not reason:
reason = 'Max retries reached'
raise Fail(reason)
self.want_reconnect = False
self.retries += 1
self.set_wait(backoff(wait_time, self.retries))
self.wait()
raise Retry(reason)
def temp_offline(self):
"""Fail and indicates file ist temporary offline, the core may take
consequences."""
raise Fail('temp. offline')
def offline(self):
"""Fail and indicate file is offline."""
raise Fail('offline')