"""
Utils
=====
"""
import hashlib
def create_dictionary_key(dictionary):
"""Create a key that represents the content of the dictionary.
Args:
dictionary (dict): the dictionary to use.
Return:
str: the key that represents the content of the dictionary.
"""
if not isinstance(dictionary, dict):
raise TypeError('The value passed should be a dictionary.')
if not dictionary:
raise ValueError('The dictionary cannot be empty.')
sorted_dict = sorted(dictionary.items())
key_parts = ''.join([
"'{key}':'{val}';".format(key=key, val=val)
for (key, val) in sorted_dict])
return hashlib.sha1(key_parts.encode('utf-8')).hexdigest()
def non_throttle_error(exception):
"""Activity Runner.
Determine whether SWF Exception was a throttle or a different error.
Args:
exception: botocore.exceptions.Client instance.
Return:
bool: True if exception was a throttle, False otherwise.
"""
return exception.response.get('Error').get('Code') != 'ThrottlingException'
def throttle_backoff_handler(details):
"""Callback to be used when a throttle backoff is invoked.
For more details see: https://github.com/litl/backoff/#event-handlers
Args:
dictionary (dict): Details of the backoff invocation. Valid keys
include:
target: reference to the function or method being invoked.
args: positional arguments to func.
kwargs: keyword arguments to func.
tries: number of invocation tries so far.
wait: seconds to wait (on_backoff handler only).
value: value triggering backoff (on_predicate decorator only).
"""
activity = details['args'][0]
activity.logger.info(
'Throttle Exception occurred on try {}. '
'Sleeping for {} seconds'.format(
details['tries'], details['wait']))
