hz4th_coder
c960d959ad
- 新增 search_cache 数据库表存储搜索缓存 - 搜索前优先查询缓存，命中则直接返回 - 缓存默认有效期7天，可配置 - 前端支持'使用缓存'开关选项 - 显示缓存状态提示 - 支持自动清理过期缓存
344 lines
12 KiB
Python
344 lines
12 KiB
Python
"""
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搜索服务 - 从内容库和互联网搜索数据
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"""
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import requests
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from bs4 import BeautifulSoup
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import json
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import subprocess
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import os
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import re
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import urllib.parse
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from datetime import datetime
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from config import Config
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from models.database import db
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class SearchService:
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def __init__(self):
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self.timeout = Config.SEARCH_TIMEOUT
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self.max_results = Config.SEARCH_MAX_RESULTS
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def _run_browser(self, *args, timeout=30000):
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"""运行 agent-browser 命令"""
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env = os.environ.copy()
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env['XDG_RUNTIME_DIR'] = '/tmp/agent-browser-runtime'
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os.makedirs(env['XDG_RUNTIME_DIR'], exist_ok=True)
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cmd = ['agent-browser'] + list(args)
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result = subprocess.run(
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cmd,
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capture_output=True,
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text=True,
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env=env,
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timeout=timeout // 1000 + 5
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)
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return result.stdout, result.stderr, result.returncode
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def search_internet(self, keyword, max_results=None, engine='bing_cn', use_cache=True, cache_days=7):
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"""
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从互联网搜索（使用 agent-browser 浏览器自动化）
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支持的搜索引擎:
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- bing_cn: Bing 中国（默认）
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- bing_global: Bing 国际版
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- google: Google
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- baidu: 百度
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参数:
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- use_cache: 是否使用缓存（默认True）
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- cache_days: 缓存有效天数（默认7天）
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"""
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max_results = max_results or self.max_results
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results = []
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# 优先查询缓存
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if use_cache:
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cached = db.get_search_cache(keyword, engine)
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if cached:
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print(f"使用缓存结果: {keyword} ({engine})")
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return cached['results']
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# 根据搜索引擎选择 URL
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encoded_keyword = urllib.parse.quote(keyword)
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search_urls = {
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'bing_cn': f"https://cn.bing.com/search?q={encoded_keyword}",
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'bing_global': f"https://www.bing.com/search?q={encoded_keyword}",
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'google': f"https://www.google.com/search?q={encoded_keyword}",
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'baidu': f"https://www.baidu.com/s?wd={encoded_keyword}"
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}
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search_url = search_urls.get(engine, search_urls['bing_cn'])
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try:
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# 1. 打开搜索引擎
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stdout, stderr, code = self._run_browser('open', search_url, '--timeout', '20000')
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if code != 0:
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print(f"打开搜索页面失败: {stderr}")
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return results
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# 等待页面加载
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stdout, stderr, code = self._run_browser('wait', '5000')
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# 2. 获取搜索结果页面结构 (JSON 格式)
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stdout, stderr, code = self._run_browser('snapshot', '--json', '--timeout', '30000')
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if code != 0:
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print(f"获取页面结构失败: {stderr}")
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return results
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# 3. 解析 JSON 提取搜索结果
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try {
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data = json.loads(stdout)
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except json.JSONDecodeError:
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print(f"解析 JSON 失败: {stdout[:500]}")
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return results
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# 4. 根据搜索引擎选择解析方法
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if engine == 'baidu':
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results = self._parse_baidu_results(data, max_results)
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else:
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results = self._parse_bing_results(data, max_results)
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# 5. 关闭浏览器
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self._run_browser('close')
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# 6. 保存到缓存
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if results and use_cache:
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db.save_search_cache(keyword, engine, results, cache_days)
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except subprocess.TimeoutExpired:
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print(f"搜索超时: {keyword}")
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except Exception as e:
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print(f"搜索出错: {str(e)}")
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# 尝试关闭浏览器
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try:
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self._run_browser('close')
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except:
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pass
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return results
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def _parse_bing_results(self, snapshot_data, max_results=10):
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"""
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从 Bing 搜索结果的 snapshot 中解析出标题和链接
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snapshot_data 是 agent-browser snapshot --json 的输出
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结构: {success, data: {snapshot: "文本格式的 accessibility tree"}, error}
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"""
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results = []
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# 获取 snapshot 文本
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snapshot = snapshot_data.get('data', {}).get('snapshot', '')
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if not snapshot:
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return results
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# 解析 accessibility tree 文本
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in_results = False
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refs = [] # 存储 (title, ref) 元组
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lines = snapshot.split('\n')
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for i, line in enumerate(lines):
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line = line.strip()
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# 进入搜索结果区域
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if 'main "搜索结果"' in line:
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in_results = True
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continue
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# 离开搜索结果区域
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if in_results and line.startswith('- ') and 'main' in line and '搜索结果' not in line:
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break
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if not in_results:
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continue
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# 匹配标题链接：link "标题文字" [ref=eXX]
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# 需要过滤域名链接（如 "zhihu.com"）和短链接
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if 'link "' in line and '[ref=' in line:
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match = re.search(r'link "([^"]+)" \[ref=(e\d+)\]', line)
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if match:
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title = match.group(1)
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ref = match.group(2)
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# 过滤短标题（域名链接如 "zhihu.com"）
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if len(title) > 20 and '.' not in title[:10]: # 不是域名格式
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refs.append((title, ref))
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# 获取每个结果的 URL
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for title, ref in refs[:max_results]:
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url = self._get_link_url(ref)
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if url and 'bing.com/search' not in url: # 过滤搜索结果页本身的链接
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results.append({
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'title': title,
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'url': url,
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'snippet': '',
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'source': 'bing'
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})
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return results
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def _parse_baidu_results(self, snapshot_data, max_results=10):
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"""从百度搜索结果中解析标题和链接"""
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results = []
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snapshot = snapshot_data.get('data', {}).get('snapshot', '')
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if not snapshot:
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return results
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# 百度搜索结果解析
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refs = []
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lines = snapshot.split('\n')
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for line in lines:
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line = line.strip()
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# 百度结果通常在 link 标签中
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if 'link "' in line and '[ref=' in line:
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match = re.search(r'link "([^"]+)" \[ref=(e\d+)\]', line)
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if match:
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title = match.group(1)
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ref = match.group(2)
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# 过滤百度内部链接和广告
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if len(title) > 10 and '百度' not in title[:6]:
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refs.append((title, ref))
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# 获取每个结果的 URL
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for title, ref in refs[:max_results]:
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url = self._get_link_url(ref)
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if url and 'baidu.com' not in url:
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results.append({
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'title': title,
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'url': url,
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'snippet': '',
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'source': 'baidu'
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})
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return results
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def _get_link_url(self, ref):
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"""通过 agent-browser 获取链接的 URL"""
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try:
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stdout, stderr, code = self._run_browser('get', 'attr', f'@{ref}', 'href', '--json', '--timeout', '5000')
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if code == 0 and stdout:
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data = json.loads(stdout)
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return data.get('data', {}).get('value', '')
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except Exception as e:
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print(f"获取 URL 失败 (ref={ref}): {e}")
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return None
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def fetch_url_content(self, url):
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"""抓取网页内容（使用 agent-browser 浏览器方式，绑过反爬虫）"""
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try:
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# 使用浏览器方式抓取
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stdout, stderr, code = self._run_browser('open', url, '--timeout', '20000')
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if code != 0:
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print(f"打开页面失败: {stderr}")
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return None
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# 等待页面加载
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self._run_browser('wait', '5000')
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# 获取页面标题
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stdout, stderr, code = self._run_browser('get', 'title', '--timeout', '5000')
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title = stdout.strip().replace('[agent-browser] ', '').strip() if code == 0 else ''
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# 获取页面内容（通过 snapshot 获取 accessibility tree）
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stdout, stderr, code = self._run_browser('snapshot', '--json', '--timeout', '15000')
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text = ''
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if code == 0 and stdout:
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try:
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data = json.loads(stdout)
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snapshot = data.get('data', {}).get('snapshot', '')
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# 从 snapshot 中提取所有 StaticText
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text = self._extract_text_from_snapshot(snapshot)
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except:
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pass
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# 获取 URL（可能被重定向）
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stdout, stderr, code = self._run_browser('get', 'url', '--timeout', '5000')
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actual_url = stdout.strip() if code == 0 else url
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# 关闭浏览器
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self._run_browser('close')
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# 提取描述（从页面内容的前200字符）
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description = text[:200].strip() if text else ''
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return {
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'title': title,
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'description': description,
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'content': text,
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'url': actual_url,
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'fetch_date': datetime.now().isoformat()
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}
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except Exception as e:
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print(f"抓取URL失败: {url}, 错误: {str(e)}")
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# 尝试关闭浏览器
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try:
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self._run_browser('close')
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except:
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pass
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return None
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def _extract_text_from_snapshot(self, snapshot):
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"""从 accessibility tree snapshot 中提取文本内容"""
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texts = []
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for line in snapshot.split('\n'):
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line = line.strip()
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if 'StaticText' in line and 'checkbox' not in line:
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# 找到 StaticText 后的内容
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idx = line.find('StaticText')
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after = line[idx + 10:].strip() # 跳过 'StaticText'
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# 去掉开头的引号
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if after.startswith('"'):
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after = after[1:]
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# 如果以 JSON 开头（错误信息），跳过
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if after.startswith('{'):
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continue
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# 提取文本内容
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text = after.rstrip('"').strip()
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if text and len(text) > 1:
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texts.append(text)
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result = '\n'.join(texts)
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# 检测是否是反爬错误页面
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if '请求存在异常' in result or '暂时限制本次访问' in result:
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return '[该网站触发了反爬机制，无法抓取内容]'
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return result
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def search_articles(self, keyword, category=None):
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"""从内容库搜索"""
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return db.search_articles(keyword, category)
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def search_all(self, keyword, category=None, include_internet=True):
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"""
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综合搜索：内容库 + 互联网
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"""
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results = {
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'articles': [],
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'internet': [],
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'total': 0
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}
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# 1. 从内容库搜索
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articles = self.search_articles(keyword, category)
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results['articles'] = articles
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# 2. 从互联网搜索（如果启用）
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if include_internet:
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internet_results = self.search_internet(keyword)
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results['internet'] = internet_results
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results['total'] = len(articles) + len(results['internet'])
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return results
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def save_to_articles(self, product_names, category, keywords, summary, content, source, url=None):
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"""保存搜索结果到内容库"""
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return db.add_article(product_names, category, keywords, summary, content, source, url)
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# 全局搜索服务实例
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search_service = SearchService() |