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