38 lines
2.1 KiB
Markdown
38 lines
2.1 KiB
Markdown
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# API Stabilization Report
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## Executive Summary
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Phase 4 focused on stabilizing the core API handlers by replacing brittle error handling logic with robust sentinel errors, ensuring consistency across services, and verifying cross-layer interactions with micro-E2E tests.
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## Key Accomplishments
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### 1. Handler Audits & Repairs
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- **PlaylistHandler**: Replaced string literal checks (`"playlist not found"`) with sentinel errors (`services.ErrPlaylistNotFound`).
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- **BitrateHandler**: Standardized error responses to use `services.ErrInvalidTrackID`, `ErrInvalidBitrate`, etc.
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- **CommentHandler**: Implemented specific error codes (404, 403) for `ErrCommentNotFound`, `ErrParentCommentNotFound`, `ErrForbidden`.
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- **RoomHandler**: Fixed "Blind 404" issue where internal errors were masked. Now distinguishes `ErrRoomNotFound` from other errors.
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### 2. Service Layer Refactoring
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- **Centralized Errors**: Created `internal/services/errors.go` to consolidate common errors and prevent duplication.
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- **Updated Services**: `PlaylistService`, `BitrateAdaptationService`, `CommentService`, `RoomService` now return consistent, exported sentinel errors wrapping low-level DB errors.
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### 3. Verification & Testing
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- **Unit/Integration Tests**: Updated all affected service and handler tests to assert new error types.
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- **Micro-E2E Test Suite**: Created `internal/handlers/api_flow_test.go` (`TestAPIFlow_UserJourney`) simulating a complete user session:
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1. Artist uploads Track.
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2. Listener streams (Bitrate Adaptation).
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3. Listener comments on Track.
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4. Artist replies.
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5. Listener attempts unauthorized delete (Fail).
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6. Listener creates Playlist and adds Track.
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## Status Checklist
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- [x] All defined handlers audit for HTTP semantics.
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- [x] Brittle string matching replaced with `errors.Is`.
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- [x] Cross-layer error consistency verified.
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- [x] Regression testing via E2E flow.
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## Recommendations for Phase 5 (Frontend Integration)
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- The API is now stable and returns predictable error codes (400, 401, 403, 404).
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- Frontend clients should handle `403` for permission issues specifically.
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- `404` reliably indicates resource missing, not internal error.
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