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# Copyright (c) 2012-2013 Mitch Garnaat http://garnaat.org/
# Copyright 2012-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
import copy
from botocore.utils import merge_dicts
def build_retry_config(
endpoint_prefix, retry_model, definitions, client_retry_config=None
):
service_config = retry_model.get(endpoint_prefix, {})
resolve_references(service_config, definitions)
# We want to merge the global defaults with the service specific
# defaults, with the service specific defaults taking precedence.
# So we use the global defaults as the base.
#
# A deepcopy is done on the retry defaults because it ensures the
# retry model has no chance of getting mutated when the service specific
# configuration or client retry config is merged in.
final_retry_config = {
'__default__': copy.deepcopy(retry_model.get('__default__', {}))
}
resolve_references(final_retry_config, definitions)
# The merge the service specific config on top.
merge_dicts(final_retry_config, service_config)
if client_retry_config is not None:
_merge_client_retry_config(final_retry_config, client_retry_config)
return final_retry_config
def _merge_client_retry_config(retry_config, client_retry_config):
max_retry_attempts_override = client_retry_config.get('max_attempts')
if max_retry_attempts_override is not None:
# In the retry config, the max_attempts refers to the maximum number
# of requests in general will be made. However, for the client's
# retry config it refers to how many retry attempts will be made at
# most. So to translate this number from the client config, one is
# added to convert it to the maximum number request that will be made
# by including the initial request.
#
# It is also important to note that if we ever support per operation
# configuration in the retry model via the client, we will need to
# revisit this logic to make sure max_attempts gets applied
# per operation.
retry_config['__default__']['max_attempts'] = (
max_retry_attempts_override + 1
)
def resolve_references(config, definitions):
"""Recursively replace $ref keys.
To cut down on duplication, common definitions can be declared
(and passed in via the ``definitions`` attribute) and then
references as {"$ref": "name"}, when this happens the reference
dict is placed with the value from the ``definition`` dict.
This is recursively done.
"""
for key, value in config.items():
if isinstance(value, dict):
if len(value) == 1 and list(value.keys())[0] == '$ref':
# Then we need to resolve this reference.
config[key] = definitions[list(value.values())[0]]
else:
resolve_references(value, definitions)