From bf359628fcacb2754f32b603949ab7bcdaa92636 Mon Sep 17 00:00:00 2001 From: starmen1265 Date: Mon, 23 Mar 2026 22:36:50 +0800 Subject: [PATCH] docs(14-03): complete semantic cache implementation plan MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit - Created SUMMARY.md with implementation details - Updated STATE.md with new decisions and session info - Updated ROADMAP.md progress (1/6 plans complete) - Marked COST-02 requirement complete Duration: 1 min (72s) Tasks: 1 (TDD: RED → GREEN) Tests: 11 passed Co-Authored-By: Claude Opus 4.6 --- .planning/REQUIREMENTS.md | 4 +- .planning/ROADMAP.md | 2 +- .planning/STATE.md | 18 +- .../14-robustness-cost/14-03-SUMMARY.md | 200 ++++++++++++++++++ 4 files changed, 214 insertions(+), 10 deletions(-) create mode 100644 .planning/phases/14-robustness-cost/14-03-SUMMARY.md diff --git a/.planning/REQUIREMENTS.md b/.planning/REQUIREMENTS.md index 5418a0c..bc22c5e 100644 --- a/.planning/REQUIREMENTS.md +++ b/.planning/REQUIREMENTS.md @@ -54,7 +54,7 @@ ### 成本控制 (COST) - [ ] **COST-01**: 长视频字幕进行分块处理，避免上下文窗口溢出 -- [ ] **COST-02**: 实现智能缓存，相同内容不重复调用 LLM +- [x] **COST-02**: 实现智能缓存，相同内容不重复调用 LLM - [ ] **COST-03**: 提供配置开关，用户可选择是否启用 LLM 分段 ### 输出格式 (OUTPUT) @@ -120,7 +120,7 @@ | ROBUST-03 | Phase 14 | Pending | | ROBUST-04 | Phase 14 | Pending | | COST-01 | Phase 14 | Pending | -| COST-02 | Phase 14 | Pending | +| COST-02 | Phase 14 | Complete | | COST-03 | Phase 14 | Pending | | OUTPUT-01 | Phase 15 | Pending | | OUTPUT-02 | Phase 15 | Pending | diff --git a/.planning/ROADMAP.md b/.planning/ROADMAP.md index e913ef7..e8d3751 100644 --- a/.planning/ROADMAP.md +++ b/.planning/ROADMAP.md @@ -233,7 +233,7 @@ Phases execute in numeric order: 1 → 2 → ... → 12 → 13 → 14 → 15 | 11. Stealth Fingerprinting | v1.4 | 2/2 | Complete | 2026-03-18 | | 12. SRT 简化处理器 | v1.5 | 2/2 | Complete | 2026-03-21 | | 13. 核心 LLM 分段功能 | 6/7 | Complete | 2026-03-21 | - | -| 14. 鲁棒性与成本控制 | v1.6 | 0/6 | Draft | 2026-03-23 | +| 14. 鲁棒性与成本控制 | 1/6 | In Progress| | 2026-03-23 | | 15. 输出优化与兼容性 | v1.6 | 0/0 | Not started | - | --- diff --git a/.planning/STATE.md b/.planning/STATE.md index 1cc565c..864a3bc 100644 --- a/.planning/STATE.md +++ b/.planning/STATE.md @@ -3,14 +3,14 @@ gsd_state_version: 1.0 milestone: v1.4 milestone_name: Zhihu Anti-Crawler status: executing -stopped_at: Phase 14 context gathered -last_updated: "2026-03-23T12:51:30.858Z" +stopped_at: Completed 14-03-PLAN.md +last_updated: "2026-03-23T14:36:46.811Z" last_activity: 2026-03-22 — Phase 13 Plan 07 completed (SRTProcessor integration) progress: total_phases: 15 completed_phases: 11 - total_plans: 38 - completed_plans: 37 + total_plans: 44 + completed_plans: 38 percent: 31 --- @@ -84,6 +84,9 @@ v1.6 Phase 13 decisions (from 13-CONTEXT.md): - [Phase 13]: Strategy Pattern with Protocol interface for extensibility (STRAT-01) - [Phase 13]: Unified segmentation strategy for all video types (per user decision, STRAT-02) - [Phase 13]: Strategy injection via constructor for easy testing and extension (STRAT-03) +- [Phase 14-robustness-cost]: 缓存键使用 SHA256 内容哈希，确保相同内容精确匹配 +- [Phase 14-robustness-cost]: 缓存文件包含 version 字段（1.0），支持未来格式变更 +- [Phase 14-robustness-cost]: 缓存失败时返回 None，不中断主流程（错误容错） ### Technical Context @@ -132,12 +135,13 @@ None. | 13 | 05 | 2min | 1 | 2 | 2026-03-22 | | 13 | 06 | 12min | 1 | 2 | 2026-03-22 | | 13 | 07 | 4min | 1 | 4 | 2026-03-22 | +| Phase 14-robustness-cost P03 | 72 | 1 tasks | 3 files | ## Session Continuity -Last session: 2026-03-23T12:51:30.856Z -Stopped at: Phase 14 context gathered -Resume file: .planning/phases/14-robustness-cost/14-CONTEXT.md +Last session: 2026-03-23T14:36:46.809Z +Stopped at: Completed 14-03-PLAN.md +Resume file: None **Next step:** Phase 13 complete, continue to Phase 14 (鲁棒性) or Phase 15 (优化) diff --git a/.planning/phases/14-robustness-cost/14-03-SUMMARY.md b/.planning/phases/14-robustness-cost/14-03-SUMMARY.md new file mode 100644 index 0000000..40b3c8a --- /dev/null +++ b/.planning/phases/14-robustness-cost/14-03-SUMMARY.md @@ -0,0 +1,200 @@ +--- +phase: 14-robustness-cost +plan: 03 +subsystem: caching +tags: [cache, sha256, content-hashing, llm-optimization] + +# Dependency graph +requires: + - phase: 13-llm + provides: SemanticSegmentationEngine, SegmentationResult, VideoSegment +provides: + - SemanticCache 缓存管理器 + - compute_content_hash() 内容哈希函数 + - 缓存目录结构 (.planning/cache/semantic/) +affects: [14-04, 14-05, semantic-segmentation] + +# Tech tracking +tech-stack: + added: [hashlib, json, pathlib] + patterns: [content-based-caching, versioned-cache-format, error-tolerant-cache] + +key-files: + created: + - kb_workflow/srt/cache/semantic_cache.py + - kb_workflow/srt/cache/__init__.py + - tests/test_semantic_robustness.py + modified: [] + +key-decisions: + - "缓存键使用 SHA256 内容哈希，确保相同内容精确匹配" + - "缓存文件包含 version 字段（1.0），支持未来格式变更" + - "缓存失败时返回 None，不中断主流程（错误容错）" + +patterns-established: + - "Pattern: Content-based caching - 使用内容哈希而非 ID 作为缓存键" + - "Pattern: Versioned cache format - 缓存数据包含版本号便于迁移" + - "Pattern: Error-tolerant cache - 缓存读写失败时降级，不影响核心功能" + +requirements-completed: [COST-02] + +# Metrics +duration: 1min +completed: 2026-03-23 +--- + +# Phase 14: 鲁棒性与成本控制 - Plan 03 Summary + +**基于 SHA256 内容哈希的智能缓存系统，避免重复 LLM 调用，降低 API 成本和延迟** + +## Performance + +- **Duration:** 1 min (72s) +- **Started:** 2026-03-23T14:34:58Z +- **Completed:** 2026-03-23T14:36:09Z +- **Tasks:** 1 (TDD cycle: RED → GREEN) +- **Files modified:** 3 + +## Accomplishments + +- **SemanticCache 缓存管理器**: 实现完整的读写功能，支持基于内容哈希的缓存 +- **SHA256 哈希函数**: `compute_content_hash()` 生成 64 字符十六进制缓存键 +- **版本控制机制**: 缓存文件包含 `version` 字段，支持未来格式变更 +- **错误容错设计**: 缓存读写失败时返回 None，不中断主流程 +- **全面测试覆盖**: 11 个测试用例，覆盖缓存命中/未命中、版本控制、错误处理 + +## Task Commits + +Each task was committed atomically: + +1. **Task 1: 创建 SemanticCache 缓存管理器** - TDD Cycle + - `b6e923c` (test) - 添加失败的测试用例（RED） + - `baf7c0f` (feat) - 实现 SemanticCache 使测试通过（GREEN） + +**Plan metadata:** TBD (docs: complete plan) + +_Note: TDD tasks followed RED → GREEN flow. No refactoring needed._ + +## Files Created/Modified + +### Created + +- `kb_workflow/srt/cache/semantic_cache.py` - 缓存管理器核心实现 + - `compute_content_hash()`: SHA256 哈希计算 + - `SemanticCache.get()`: 从缓存读取 SegmentationResult + - `SemanticCache.set()`: 保存 SegmentationResult 到缓存 + - 支持版本控制和错误容错 + +- `kb_workflow/srt/cache/__init__.py` - 缓存模块导出 + - 导出 `SemanticCache` 和 `compute_content_hash` + +- `tests/test_semantic_robustness.py` - 缓存功能测试套件 + - `TestComputeContentHash`: 测试哈希计算（3 个测试） + - `TestSemanticCache`: 测试缓存功能（8 个测试） + - 覆盖：缓存命中/未命中、版本控制、错误处理、多缓存项 + +### Modified + +None + +## Decisions Made + +所有决策遵守 14-CONTEXT.md 中的用户决策： + +1. **缓存键使用 SHA256 内容哈希** + - 理由: 精确匹配，相同内容一定命中缓存 + - 实现: `hashlib.sha256(content.encode('utf-8')).hexdigest()` + +2. **缓存存储在本地文件系统** + - 理由: 简单持久化，无需外部依赖 + - 路径: `.planning/cache/semantic/` + +3. **缓存 TTL 永久有效** + - 理由: 字幕内容不变，分段结果应该一致 + - 清理: 手动删除缓存文件 + +4. **缓存包含完整的 SegmentationResult** + - 理由: 包含 video_type 和 segments，完整保存 LLM 输出 + - 格式: JSON + version 字段 + +5. **错误容错设计** + - 理由: 缓存失败不应中断主流程 + - 实现: 读写失败时返回 None，记录 warning 日志 + +## Deviations from Plan + +None - plan executed exactly as written. + +## Issues Encountered + +None - implementation proceeded smoothly with TDD approach. + +## User Setup Required + +None - no external service configuration required. + +缓存目录会在首次使用时自动创建：`.planning/cache/semantic/` + +## Next Phase Readiness + +### Ready for Integration + +- ✅ SemanticCache 类已实现并测试 +- ✅ 缓存模块可以导出到其他组件 +- ✅ 错误容错机制已就位 + +### Integration Points + +计划 14-04 和 14-05 可以将 SemanticCache 集成到 UnifiedSegmentationStrategy： + +```python +from kb_workflow.srt.cache import SemanticCache + +class UnifiedSegmentationStrategy: + def __init__(self, ...): + self.cache = SemanticCache() # 添加缓存层 + + def segment(self, segments, metadata): + content = " ".join(seg.text for seg in segments) + + # 尝试从缓存读取 + cached_result = self.cache.get(content) + if cached_result: + return cached_result.segments + + # 调用 LLM + result = self._call_llm(content, metadata) + + # 保存到缓存 + self.cache.set(content, result) + + return result.segments +``` + +### Blockers/Concerns + +None. + +## Verification + +所有测试通过： + +```bash +pytest tests/test_semantic_robustness.py::TestComputeContentHash \ + tests/test_semantic_robustness.py::TestSemanticCache -v +``` + +结果：11 passed in 0.08s + +### Success Criteria Met + +- ✅ 相同内容第二次调用时从缓存读取 +- ✅ 缓存文件存储在 `.planning/cache/semantic/` 目录 +- ✅ 缓存文件命名格式: `{sha256_hash}.json` +- ✅ 缓存内容包含完整的 SegmentationResult (JSON 格式) +- ✅ 缓存命中时记录 debug 级别日志 +- ✅ 所有测试通过 (11/11) + +--- +*Phase: 14-robustness-cost* +*Completed: 2026-03-23*