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Benjamin Chibuzor-Orie 7c8592a7e0
adds middleware for rate limiting (#1724)
* adds middleware for rate limiting

* added comment for InMemoryStore ShouldAllow

* removed redundant mutex declaration

* fixed lint issues

* removed sleep from tests

* improved coverage

* refactor: renames Identifiers, includes default SourceFunc

* Added last seen stats for visitor

* uses http Constants for improved readdability
adds default error handler

* used other handler apart from default handler to mark custom error handler for rate limiting

* split tests into separate blocks
added an error pair to IdentifierExtractor
Includes deny handler for explicitly denying requests

* adds comments for exported members Extractor and ErrorHandler

* makes cleanup implementation inhouse

* Avoid race for cleanup due to non-atomic access to store.expiresIn

* Use a dedicated producer for rate testing

* tidy commit

* refactors tests, implicitly tests lastSeen property on visitor
switches NewRateLimiterMemoryStore constructor to Referential Functions style (Advised by @pafuent)

* switches to mock of time module for time based tests
tests are now fully deterministic

* improved coverage

* replaces Rob Pike referential options with more conventional struct configs
makes cleanup asynchronous

* blocks racy access to lastCleanup

* Add benchmark tests for rate limiter

* Add rate limiter with sharded memory store

* Racy access to store.lastCleanup eliminated
Merges in shiny sharded map implementation by @lammel

* Remove RateLimiterShradedMemoryStore for now

* Make fields for RateLimiterStoreConfig public for external configuration

* Improve docs for RateLimiter usage

* Fix ErrorHandler vs. DenyHandler usage for rate limiter

* Simplify NewRateLimiterMemoryStore

* improved coverage

* updated errorHandler and denyHandler to use echo.HTTPError

* Improve wording for error and comments

* Remove duplicate lastSeen marking for Allow

* Improve wording for comments

* Add disclaimer on perf characteristics of memory store

* changes Allow signature on rate limiter to return err too

Co-authored-by: Roland Lammel <rl@neotel.at>
2021-01-15 17:53:15 -03:00

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