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[PR #23765] test: add comprehensive test suite for rate limiting module #30391

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opened 2026-02-21 20:47:24 -05:00 by yindo · 0 comments
yindo commented 2026-02-21 20:47:24 -05:00
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Original Pull Request: https://github.com/langgenius/dify/pull/23765

State: closed
Merged: Yes

Description

Add comprehensive unit tests for api/core/app/features/rate_limiting/rate_limit.py module.

Core Functionality Tests

  • Singleton pattern implementation and instance management
  • Rate limit enforcement and quota exceeded handling
  • Request entry and exit lifecycle management
  • Redis integration with proper key management
  • Cache synchronization and timeout cleanup
  • Generator wrapper functionality with resource cleanup
  • Disabled state bypass behavior

Security-Focused Tests

  • Concurrent instance creation: Thread-safe singleton pattern under concurrent access
  • Concurrent enter requests: Rate limiting accuracy under high concurrency load
  • Resource cleanup on exceptions: Proper cleanup when generator iteration fails
  • Timeout request cleanup: Automatic removal of stale requests to prevent resource leaks
  • Cross-tenant isolation: Separate rate limit instances for different client IDs

Edge Cases

  • Zero and negative rate limit values
  • Request entry without provided request ID (auto-generation)
  • Generator objects without close method
  • Redis connection failures and state inconsistencies
  • Time-based cache flush interval triggers
  • Mixed mapping and generator input handling
  • Explicit generator close and iteration prevention after close

Test Infrastructure

  • conftest.py: Comprehensive Redis mocking with realistic behavior simulation
  • Fixtures: Time mocking, sample generators, and singleton cleanup between tests
  • Mock strategies: Thread-safe Redis simulation for concurrency testing

The extensive test coverage is intentional given the critical nature of rate limiting functionality in the system. Rate limiting directly impacts system stability, resource protection, and user experience under high load conditions.

Checklist

  • This change requires a documentation update, included: Dify Document
  • I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
  • I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
  • I've updated the documentation accordingly.
  • I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods
**Original Pull Request:** https://github.com/langgenius/dify/pull/23765 **State:** closed **Merged:** Yes --- ## Description Add comprehensive unit tests for api/core/app/features/rate_limiting/rate_limit.py module. ## Core Functionality Tests - Singleton pattern implementation and instance management - Rate limit enforcement and quota exceeded handling - Request entry and exit lifecycle management - Redis integration with proper key management - Cache synchronization and timeout cleanup - Generator wrapper functionality with resource cleanup - Disabled state bypass behavior ## Security-Focused Tests - **Concurrent instance creation**: Thread-safe singleton pattern under concurrent access - **Concurrent enter requests**: Rate limiting accuracy under high concurrency load - **Resource cleanup on exceptions**: Proper cleanup when generator iteration fails - **Timeout request cleanup**: Automatic removal of stale requests to prevent resource leaks - **Cross-tenant isolation**: Separate rate limit instances for different client IDs ## Edge Cases - Zero and negative rate limit values - Request entry without provided request ID (auto-generation) - Generator objects without close method - Redis connection failures and state inconsistencies - Time-based cache flush interval triggers - Mixed mapping and generator input handling - Explicit generator close and iteration prevention after close ## Test Infrastructure - **conftest.py**: Comprehensive Redis mocking with realistic behavior simulation - **Fixtures**: Time mocking, sample generators, and singleton cleanup between tests - **Mock strategies**: Thread-safe Redis simulation for concurrency testing The extensive test coverage is intentional given the critical nature of rate limiting functionality in the system. Rate limiting directly impacts system stability, resource protection, and user experience under high load conditions. ## Checklist - [ ] This change requires a documentation update, included: [Dify Document](https://github.com/langgenius/dify-docs) - [x] I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!) - [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change. - [x] I've updated the documentation accordingly. - [x] I ran `dev/reformat`(backend) and `cd web && npx lint-staged`(frontend) to appease the lint gods
yindo added the pull-request label 2026-02-21 20:47:24 -05:00
yindo closed this issue 2026-02-21 20:47:24 -05:00
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Reference: langgenius/dify#30391
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