most recent provider and provider stores#42

Merged

mattsb42-aws merged 11 commits intoaws:masterfrom

mattsb42-aws:mrp

May 2, 2018

Commits on May 1, 2018

convert all attrs classes to use custom init methods to enable mypy to work https://github.com/awslabs/aws-dynamodb-encryption-python/issues/4
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mypy fixes
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initial draft of ProviderStore, MetaStore, and MostRecentProvider
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fix enum referencces in MetaProvider to correctly reference enum value
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add acceptance tests and vectors for MostRecentProvider and MetaStore
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normalize versions returned by MetaStore from Decimal to int
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removing MetaStore "replicate" stub: we will add that in later
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add fuzzy ttl period to MostRecentProvider to avoid cache contention and version explosion
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remove unused MostRecentProvider._can_use_current
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* add cache get attempt after getting the most recent version from the provider store
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Commits on May 2, 2018

fix confused naming of requested vs received version in _get_most_recent_version
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