feat(10-02): integrate ProxyPool into ZhihuCrawler

- Add proxy_pool parameter to ZhihuCrawler constructor
- Add _current_proxy tracking for health check feedback
- Implement _parse_proxy_url static method for URL parsing
- Implement _on_request_success/failure for proxy health feedback
- Prioritize proxy_pool over config.proxy for multi-proxy support
- Maintain backward compatibility with single proxy config

Tests:
- test_crawler_accepts_proxy_pool
- test_crawler_without_proxy_pool (backward compatibility)
- test_parse_proxy_url (HTTP, auth, SOCKS5)
- test_proxy_pool_takes_priority_over_config

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

kb_workflow/crawler/zhihu_crawler.py

@@ -8,12 +8,14 @@ Supports:
 - Random request delay
 - Retry with exponential backoff
 - Automatic x-zse-96 signature handling via browser
+- ProxyPool integration for multi-proxy rotation
 """
 
 import random
 import re
 import time
 from typing import Optional, Dict, Any
+from urllib.parse import urlparse
 
 from playwright.sync_api import Route, Response, sync_playwright
 from tenacity import Retrying, stop_after_attempt, wait_exponential, RetryError
@@ -32,6 +34,7 @@ from .models import (
     CrawlResult,
 )
 from .config import CrawlerConfig, get_crawler_config
+from .proxy_pool import ProxyPool, ProxyEntry
 
 
 class ZhihuApiInterceptor:
@@ -104,7 +107,8 @@ class ZhihuCrawler:
         self,
         headless: bool = True,
         timeout: int = 30,
-        config: Optional[CrawlerConfig] = None
+        config: Optional[CrawlerConfig] = None,
+        proxy_pool: Optional[ProxyPool] = None
     ):
         """Initialize ZhihuCrawler.
 
@@ -112,10 +116,13 @@ class ZhihuCrawler:
             headless: Whether to run browser in headless mode
             timeout: Request timeout in seconds
             config: Optional CrawlerConfig instance (uses environment if not provided)
+            proxy_pool: Optional ProxyPool instance for multi-proxy rotation
         """
         self.headless = headless
         self.timeout = timeout
         self.config = config or get_crawler_config()
+        self.proxy_pool = proxy_pool
+        self._current_proxy: Optional[ProxyEntry] = None
         self.browser: Optional[PlaywrightBrowser] = None
         self.interceptor: Optional[ZhihuApiInterceptor] = None
         # Internal browser management for proxy support
@@ -148,6 +155,7 @@ class ZhihuCrawler:
         """Start browser with proxy configuration.
 
         Validates proxy if required and applies to browser context.
+        Prioritizes proxy_pool over config.proxy for multi-proxy support.
 
         Args:
             cookie: Cookie string for authentication
@@ -166,8 +174,15 @@ class ZhihuCrawler:
             'user_agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
         }
 
-        # Apply proxy if configured
+        # Prioritize proxy pool over single proxy config
-        if self.config.proxy:
+        if self.proxy_pool and self.proxy_pool.has_proxies():
+            proxy_entry = self.proxy_pool.get_next_proxy()
+            if proxy_entry:
+                proxy_config = self._parse_proxy_url(proxy_entry.url)
+                context_options["proxy"] = proxy_config
+                self._current_proxy = proxy_entry
+        elif self.config.proxy:
+            # Backward compatibility: use single proxy configuration
             context_options["proxy"] = self.config.proxy.to_playwright_format()
 
         # Block Service Worker to prevent interference with API interception
@@ -182,6 +197,40 @@ class ZhihuCrawler:
         self._page = self._context.new_page()
         self._page.set_default_timeout(self.timeout * 1000)
 
+    @staticmethod
+    def _parse_proxy_url(url: str) -> Dict[str, Any]:
+        """Parse proxy URL into Playwright format.
+
+        Args:
+            url: Proxy URL (e.g., http://user:pass@proxy.example.com:8080)
+
+        Returns:
+            Dictionary with server, username, password for Playwright
+        """
+        parsed = urlparse(url)
+        server = f"{parsed.scheme}://{parsed.hostname}"
+        if parsed.port:
+            server += f":{parsed.port}"
+        config: Dict[str, Any] = {"server": server}
+        if parsed.username:
+            config["username"] = parsed.username
+        if parsed.password:
+            config["password"] = parsed.password
+        return config
+
+    def _on_request_success(self) -> None:
+        """Notify proxy pool of successful request."""
+        if self._current_proxy:
+            self._current_proxy.record_success()
+
+    def _on_request_failure(self) -> None:
+        """Notify proxy pool of failed request."""
+        if self._current_proxy:
+            self._current_proxy.record_failure(
+                max_fail_count=self.proxy_pool.config.max_fail_count
+                if self.proxy_pool else 3
+            )
+
     def _add_cookies(self, cookie_str: str) -> None:
         """Add cookies to browser context.
 

tests/test_crawler/test_proxy_pool.py

@@ -6,12 +6,14 @@ Tests cover:
 - Round-robin proxy rotation
 - Empty pool handling
 - Single proxy handling
+- Health check and cooldown recovery
+- ZhihuCrawler integration with ProxyPool
 """
 
 import os
 import pytest
 from pathlib import Path
-from unittest.mock import patch
+from unittest.mock import patch, MagicMock
 
 # Import will fail until proxy_pool module is implemented (RED phase)
 from kb_workflow.crawler.proxy_pool import ProxyPool, ProxyEntry, ProxyPoolConfig
@@ -304,3 +306,70 @@ class TestProxyPoolHealthCheck:
             pool._entries[1].record_failure(max_fail_count=3)
 
         assert pool.get_available_count() == 1
+
+
+class TestZhihuCrawlerProxyPoolIntegration:
+    """Tests for ZhihuCrawler integration with ProxyPool."""
+
+    def test_crawler_accepts_proxy_pool(self):
+        """Test that ZhihuCrawler accepts proxy_pool parameter."""
+        from kb_workflow.crawler.zhihu_crawler import ZhihuCrawler
+
+        config = ProxyPoolConfig(
+            proxies=["http://proxy-a:8080", "http://proxy-b:8080"]
+        )
+        pool = ProxyPool(config)
+
+        crawler = ZhihuCrawler(proxy_pool=pool)
+
+        assert crawler.proxy_pool is pool
+        assert crawler.proxy_pool.has_proxies()
+
+    def test_crawler_without_proxy_pool(self):
+        """Test that ZhihuCrawler works without proxy_pool (backward compatibility)."""
+        from kb_workflow.crawler.zhihu_crawler import ZhihuCrawler
+
+        crawler = ZhihuCrawler()
+
+        assert crawler.proxy_pool is None
+
+    def test_parse_proxy_url(self):
+        """Test _parse_proxy_url static method."""
+        from kb_workflow.crawler.zhihu_crawler import ZhihuCrawler
+
+        # Test HTTP proxy without auth
+        result = ZhihuCrawler._parse_proxy_url("http://127.0.0.1:7890")
+        assert result == {"server": "http://127.0.0.1:7890"}
+
+        # Test HTTP proxy with auth
+        result = ZhihuCrawler._parse_proxy_url("http://user:pass@proxy.example.com:8080")
+        assert result == {
+            "server": "http://proxy.example.com:8080",
+            "username": "user",
+            "password": "pass"
+        }
+
+        # Test SOCKS5 proxy
+        result = ZhihuCrawler._parse_proxy_url("socks5://127.0.0.1:1080")
+        assert result == {"server": "socks5://127.0.0.1:1080"}
+
+    def test_proxy_pool_takes_priority_over_config(self):
+        """Test that proxy_pool takes priority over config.proxy."""
+        from kb_workflow.crawler.zhihu_crawler import ZhihuCrawler
+        from kb_workflow.crawler.config import CrawlerConfig, ProxyConfig
+
+        # Create config with single proxy
+        single_proxy_config = CrawlerConfig(
+            proxy=ProxyConfig(server="http://config-proxy:9999")
+        )
+
+        # Create proxy pool with different proxies
+        pool = ProxyPool(ProxyPoolConfig(
+            proxies=["http://pool-proxy:8080"]
+        ))
+
+        crawler = ZhihuCrawler(config=single_proxy_config, proxy_pool=pool)
+
+        # Verify proxy_pool is set
+        assert crawler.proxy_pool is pool
+        assert crawler.config.proxy is not None