feat: improve error handling in MemoryFrontendRateLimiter

[taaaahaa]

Description

This pull request improves the error handling in the MemoryFrontendRateLimiter implementation of the frontend rate limiter. Previously, the Take method would swallow any errors that occurred during the rate limit check, which made it difficult to diagnose and troubleshoot issues.

The updated implementation now returns any errors that occur, and also introduces a MemoryFrontendRateLimitMetrics interface to allow reporting of these errors for observability purposes.

Tests

The existing tests for the MemoryFrontendRateLimiter should cover the changes made to the Take method. However, additional tests should be added to ensure that the error handling and metric reporting are working as expected.

Additional context

Improving the error handling and observability of the rate limiting system will make it easier to maintain and debug issues in production environments.

Metadata

• Fixes automatically deploys builds from master to synthetix-dev #123 (example issue link)

[coderabbitai]

Walkthrough

Walkthrough

The code changes primarily enhance the rate limiting functionality in the proxy service by introducing a more efficient locking mechanism and integrating metrics tracking. The sync.Mutex has been replaced with sync.RWMutex for better concurrency handling. Additionally, a new metrics interface is implemented and utilized in both memory and Redis rate limiters, allowing for better monitoring and management of rate limiting operations.

Changes

File Path	Change Summary
.../frontend_rate_limiter.go	- Replaced sync.Mutex with sync.RWMutex - Integrated MemoryFrontendRateLimitMetrics interface

Assessment against linked issues

Objective	Addressed	Explanation
Automatically deploys builds from master to synthetix-dev [#123]	❌	The changes are unrelated to deployment processes or configurations.

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Recent Review Details

Configuration used: .coderabbit.yml

Commits

Files that changed from the base of the PR and between 844cc20 and 3746b9f.

Files selected for processing (1)

• proxyd/frontend_rate_limiter.go (4 hunks)

Additional comments not posted (7)

proxyd/frontend_rate_limiter.go (7)

29-29: Consider the implications of using sync.RWMutex in limitedKeys.

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67-68: Introduction of MemoryFrontendRateLimitMetrics interface is a positive change for better error handling and observability.

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64-65: Proper integration of the metrics field in MemoryFrontendRateLimiter enhances metrics collection capabilities.

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110-111: Proper integration of the metrics field in RedisFrontendRateLimiter enhances metrics collection capabilities.

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71-75: The updated constructor for MemoryFrontendRateLimiter correctly initializes the metrics field.

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117-123: The updated constructor for RedisFrontendRateLimiter correctly initializes the metrics field.

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139-139: Correct usage of metrics.IncTakeError() in RedisFrontendRateLimiter for error handling.

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