docs(10-01): complete proxy pool core plan

- SUMMARY.md: proxy pool infrastructure with round-robin rotation - STATE.md: updated position to Plan 1 of 2 - ROADMAP.md: marked 10-01 complete - REQUIREMENTS.md: marked PROXY-01, PROXY-02 complete Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-18 16:43:34 +08:00
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+---
+phase: 10-proxy-pool
+plan: 01
+subsystem: crawler
+tags: [proxy, round-robin, yaml-config, pydantic, playwright]
+
+# Dependency graph
+requires: []
+provides:
+  - ProxyPool class for multi-proxy management
+  - ProxyEntry class for proxy state tracking
+  - ProxyPoolConfig class for YAML configuration
+  - Round-robin rotation strategy
+  - Backward compatible env var loading
+affects: [11-behavior-masking, 12-captcha-handling, zhihu-crawler]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - Pydantic BaseModel for configuration
+    - Lazy recovery check for cooldown
+    - Round-robin with index pointer
+
+key-files:
+  created:
+    - kb_workflow/crawler/proxy_pool.py
+    - tests/test_crawler/test_proxy_pool.py
+  modified: []
+
+key-decisions:
+  - "Use index pointer instead of itertools.cycle for better testability"
+  - "Lazy cooldown check in get_next_proxy() instead of background timer"
+  - "Fallback to first proxy when all unavailable"
+
+patterns-established:
+  - "Pattern: from_yaml() class method for file-based config loading"
+  - "Pattern: from_env_fallback() for backward compatibility"
+
+requirements-completed: [PROXY-01, PROXY-02]
+
+# Metrics
+duration: 3min
+completed: "2026-03-18"
+---
+
+# Phase 10 Plan 01: Proxy Pool Core Summary
+
+**Proxy pool infrastructure with YAML configuration, round-robin rotation, and backward compatible environment variable fallback**
+
+## Performance
+
+- **Duration:** 3 min
+- **Started:** 2026-03-18T08:37:15Z
+- **Completed:** 2026-03-18T08:40:28Z
+- **Tasks:** 2
+- **Files modified:** 2
+
+## Accomplishments
+- ProxyPool class manages multiple proxies with round-robin rotation
+- ProxyEntry tracks proxy state including failures and availability
+- YAML configuration loading from ~/.kb_proxies.yaml
+- Backward compatible HTTPS_PROXY/HTTP_PROXY environment variable loading
+- Lazy cooldown recovery check without background threads
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 0: 创建测试脚手架** - `bcf1a88` (test)
+2. **Task 1: 实现 ProxyEntry + ProxyPool 核心类** - `c58a7d0` (feat)
+
+_Note: TDD tasks have multiple commits (test → feat)_
+
+## Files Created/Modified
+- `kb_workflow/crawler/proxy_pool.py` - ProxyPool, ProxyEntry, ProxyPoolConfig classes
+- `tests/test_crawler/test_proxy_pool.py` - 11 unit tests for proxy pool functionality
+
+## Decisions Made
+- Use index pointer (`_current_index`) for round-robin instead of `itertools.cycle` for better testability and predictable behavior
+- Lazy cooldown check in `get_next_proxy()` instead of background timer to avoid threading complexity
+- When all proxies are unavailable, fallback to first proxy instead of returning None
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None - implementation followed RESEARCH.md pattern examples directly.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Proxy pool core functionality complete
+- Ready for Plan 02 (health check and failure recovery)
+- Integration with ZhihuCrawler pending
+
+---
+*Phase: 10-proxy-pool*
+*Completed: 2026-03-18*