thzxx
8718f5ac6f
根因: ?? 空值回退链让 AI 传入的 max_results:10 直接生效, 配置面板的 30 被跳过 修复: 改用 Math.max() 让配置面板作为下限, AI 参数不得低于配置值 同时修复 fetch_top 的相同问题
601 lines
22 KiB
TypeScript
601 lines
22 KiB
TypeScript
/**
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* web_search — 网络搜索工具
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*
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* 双模式搜索：SearXNG 元搜索 / 内置四引擎并行搜索
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* 内置引擎：Bing + 百度 + 搜狗 + 360 搜索（Promise.allSettled 容错并发）
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* 智能排序：引擎权重(50%) + 可达性(30%) + 摘要质量(20%)
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* 自动抓取：对前 N 条结果调用 web_fetch 获取完整正文
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*
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* @see docs/Agent网络工具通用设计-v2.md — 第 2 章 web_search 搜索设计
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*/
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import type { IMetonaTool, ToolExecutionContext } from '../../types/metona-tool';
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import type { MetonaToolDef } from '../../../harness/types';
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import { MetonaToolCategory, MetonaRiskLevel } from '../../../harness/types';
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import type { ConfigService } from '../../../services/config.service';
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import {
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searchCache,
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normalizeUrl,
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fetchWithTimeout,
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buildSearXNGAuthHeaders,
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logTool,
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} from './network-utils';
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import type { WebFetchTool } from './web-fetch';
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// ===== 类型定义 =====
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interface SearchResult {
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title: string;
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url: string;
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snippet: string;
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engine: string;
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weight: number;
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reachable?: boolean;
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_score?: number;
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_enhanced?: boolean;
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}
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interface SearXNGConfig {
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enabled: boolean;
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url: string;
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engines: string;
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language: string;
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safesearch: number;
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time_range: string;
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max_results: number;
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auth_key: string;
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auth_type: string;
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format: string;
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fetch_count: number;
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fetch_mode: string;
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}
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// ===== 引擎定义 =====
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interface EngineDef {
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name: string;
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weight: number;
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searchUrl: (query: string, timeRange?: string) => string;
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parse: (html: string) => SearchResult[];
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}
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const ENGINES: EngineDef[] = [
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{
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name: 'bing',
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weight: 90,
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searchUrl: (q, tr) => {
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const freshness = tr ? `&filters=ex1:"ez${tr === 'day' ? '1' : tr === 'week' ? '2' : tr === 'month' ? '3' : '4'}"` : '';
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return `https://www.bing.com/search?q=${encodeURIComponent(q)}${freshness}&count=20`;
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},
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parse: parseBing,
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},
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{
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name: '百度',
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weight: 80,
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searchUrl: (q) => `https://www.baidu.com/s?wd=${encodeURIComponent(q)}&rn=20`,
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parse: parseBaidu,
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},
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{
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name: '搜狗',
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weight: 75,
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searchUrl: (q) => `https://www.sogou.com/web?query=${encodeURIComponent(q)}&num=20`,
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parse: parseSogou,
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},
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{
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name: '360搜索',
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weight: 75,
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searchUrl: (q) => `https://www.so.com/s?q=${encodeURIComponent(q)}&pn=20`,
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parse: parse360,
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},
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];
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// ===== HTML 解析器（正则实现，后续可迁移至 cheerio） =====
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function parseBing(html: string): SearchResult[] {
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const results: SearchResult[] = [];
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const blocks = html.split(/<li[^>]*class="b_algo"/i).slice(1);
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for (const block of blocks) {
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const titleMatch = block.match(/<a[^>]*href="([^"]+)"[^>]*>([\s\S]*?)<\/a>/i);
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if (!titleMatch) continue;
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const url = titleMatch[1];
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const title = titleMatch[2].replace(/<[^>]+>/g, '').trim();
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const snippetMatch = block.match(/<p[^>]*>([\s\S]*?)<\/p>/i) || block.match(/class="b_caption"[^>]*>([\s\S]*?)<\/div>/i);
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const snippet = snippetMatch ? snippetMatch[1].replace(/<[^>]+>/g, '').trim() : '';
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if (title && url && !url.includes('bing.com')) {
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results.push({ title, url, snippet, engine: 'bing', weight: 90 });
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}
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}
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return results;
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}
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function parseBaidu(html: string): SearchResult[] {
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const results: SearchResult[] = [];
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const blocks = html.split(/<div[^>]*class="result[^"]*"/i).slice(1);
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for (const block of blocks) {
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const titleMatch = block.match(/<a[^>]*data-url="([^"]+)"[^>]*>([\s\S]*?)<\/a>/i)
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|| block.match(/<a[^>]*href="([^"]+)"[^>]*>([\s\S]*?)<\/a>/i);
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if (!titleMatch) continue;
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const url = titleMatch[1].startsWith('http') ? titleMatch[1] : `https://${titleMatch[1]}`;
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const title = titleMatch[2].replace(/<[^>]+>/g, '').trim();
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const snippetMatch = block.match(/class="c-abstract[^"]*"[^>]*>([\s\S]*?)<\/span>/i)
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|| block.match(/class="content-right[^"]*"[^>]*>([\s\S]*?)<\/div>/i);
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const snippet = snippetMatch ? snippetMatch[1].replace(/<[^>]+>/g, '').trim() : '';
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if (title && url && !url.includes('baidu.com/link')) {
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results.push({ title, url, snippet, engine: '百度', weight: 80 });
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}
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}
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return results;
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}
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function parseSogou(html: string): SearchResult[] {
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const results: SearchResult[] = [];
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const blocks = html.split(/<div[^>]*class="vrwrap"/i).slice(1)
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.concat(html.split(/<div[^>]*class="rb"/i).slice(1));
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for (const block of blocks) {
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const titleMatch = block.match(/<a[^>]*href="([^"]+)"[^>]*>([\s\S]*?)<\/a>/i);
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if (!titleMatch) continue;
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const url = titleMatch[1].startsWith('http') ? titleMatch[1] : `https://www.sogou.com${titleMatch[1]}`;
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const title = titleMatch[2].replace(/<[^>]+>/g, '').trim();
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const snippetMatch = block.match(/class="star-wiki[^"]*"[^>]*>([\s\S]*?)<\/div>/i)
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|| block.match(/class="space-txt[^"]*"[^>]*>([\s\S]*?)<\/p>/i)
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|| block.match(/class="str_info[^"]*"[^>]*>([\s\S]*?)<\/p>/i);
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const snippet = snippetMatch ? snippetMatch[1].replace(/<[^>]+>/g, '').trim() : '';
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if (title && url && !url.includes('sogou.com')) {
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results.push({ title, url, snippet, engine: '搜狗', weight: 75 });
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}
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}
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return results;
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}
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function parse360(html: string): SearchResult[] {
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const results: SearchResult[] = [];
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const blocks = html.split(/<li[^>]*class="res-list"/i).slice(1)
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.concat(html.split(/<div[^>]*class="result"/i).slice(1));
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for (const block of blocks) {
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const titleMatch = block.match(/<a[^>]*href="([^"]+)"[^>]*>([\s\S]*?)<\/a>/i);
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if (!titleMatch) continue;
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const url = titleMatch[1];
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const title = titleMatch[2].replace(/<[^>]+>/g, '').trim();
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const snippetMatch = block.match(/class="res-desc[^"]*"[^>]*>([\s\S]*?)<\/p>/i)
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|| block.match(/class="res-rich[^"]*"[^>]*>([\s\S]*?)<\/div>/i)
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|| block.match(/class="res-summary[^"]*"[^>]*>([\s\S]*?)<\/p>/i)
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|| block.match(/<dd[^>]*>([\s\S]*?)<\/dd>/i);
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const snippet = snippetMatch ? snippetMatch[1].replace(/<[^>]+>/g, '').trim() : '';
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if (title && url && !url.includes('so.com')) {
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results.push({ title, url, snippet, engine: '360搜索', weight: 75 });
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}
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}
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return results;
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}
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// ===== 可达性预检 =====
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async function checkReachability(urls: string[], concurrency = 5): Promise<Map<string, boolean>> {
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const result = new Map<string, boolean>();
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for (let i = 0; i < urls.length; i += concurrency) {
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const batch = urls.slice(i, i + concurrency);
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const checks = batch.map(async (url) => {
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try {
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const resp = await fetchWithTimeout(url, { method: 'HEAD', redirect: 'follow' }, 3_000);
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result.set(url, resp.ok);
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} catch {
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result.set(url, false);
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}
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});
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await Promise.allSettled(checks);
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}
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return result;
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}
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// ===== 智能排序 =====
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function smartSort(results: SearchResult[], reachabilityMap: Map<string, boolean>): SearchResult[] {
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for (const r of results) {
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const reachability = r.reachable ? 30 : -20;
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const snippetQuality = Math.min(r.snippet.length, 100) / 100 * 20;
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const weightScore = (r.weight / 100) * 50;
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r._score = weightScore + reachability + snippetQuality;
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}
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return results.sort((a, b) => (b._score ?? 0) - (a._score ?? 0));
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}
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// ===== 相关性过滤（用于自动抓取） =====
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function computeRelevance(query: string, result: SearchResult): number {
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const terms: string[] = [];
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// 中文双字/三字片段
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const chinese = query.match(/[\u4e00-\u9fa5]{2,3}/g);
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if (chinese) terms.push(...chinese);
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// 英文单词
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const english = query.match(/[a-zA-Z]{2,}/g);
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if (english) terms.push(...english);
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let score = 0;
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const text = `${result.title} ${result.snippet}`.toLowerCase();
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for (const term of terms) {
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if (text.includes(term.toLowerCase())) score += 10;
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}
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return Math.min(score, 100);
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}
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// ===== WebSearchTool =====
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export class WebSearchTool implements IMetonaTool {
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readonly definition: MetonaToolDef = {
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name: 'web_search',
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description: 'Search the web for information. Returns titles, snippets, and URLs. When SearXNG is enabled, uses the configured SearXNG instance; otherwise uses built-in engines (Bing, Baidu, Sogou, 360). Automatically fetches full content for top results.',
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parameters: {
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type: 'object',
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properties: {
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query: { type: 'string', description: 'Search query keywords' },
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max_results: { type: 'number', description: 'Maximum results (default 30, max 30)' },
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time_range: { type: 'string', description: 'Time filter: day, week, month, year (optional)' },
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enhance_snippets: { type: 'boolean', description: 'Auto-enhance short snippets (default true)' },
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fetch_top: { type: 'number', description: 'Auto-fetch full content for top N results (3-8, default 5)' },
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},
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required: ['query'],
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},
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category: MetonaToolCategory.NETWORK,
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riskLevel: MetonaRiskLevel.LOW,
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requiresPermission: false,
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timeoutMs: 300_000,
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};
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constructor(
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private configService: ConfigService,
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private webFetchTool: WebFetchTool,
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) {}
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async execute(args: Record<string, unknown>, _context: ToolExecutionContext): Promise<unknown> {
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const query = args.query as string;
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// 读取 SearXNG 配置（提前读取，使工具参数默认值与配置一致）
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const searxngConfig = this.readSearXNGConfig();
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// max_results: 配置面板为下限，AI 参数不得低于配置值，上限 30
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const argMaxResults = (args.max_results as number) ?? undefined;
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const cfgMaxResults = searxngConfig.max_results > 0 ? searxngConfig.max_results : undefined;
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const maxResults = Math.min(30, Math.max(1, argMaxResults ?? 30, cfgMaxResults ?? 0));
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const timeRange = (args.time_range as string) ?? '';
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const enhanceSnippets = (args.enhance_snippets as boolean) ?? true;
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// fetch_top: 配置面板为下限，AI 参数不得低于配置值，上限 8
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const argFetchTop = (args.fetch_top as number) ?? undefined;
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const cfgFetchCount = searxngConfig.fetch_count > 0 ? searxngConfig.fetch_count : undefined;
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const fetchTop = Math.min(8, Math.max(3, argFetchTop ?? 5, cfgFetchCount ?? 0));
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// 缓存检查（缓存 key 含 SearXNG 模式，避免切换后返回旧缓存）
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const cacheKey = `${searxngConfig.enabled ? 'searxng' : 'builtin'}:${normalizeUrl(query).toLowerCase()}`;
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const cached = searchCache.get(cacheKey);
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if (cached) {
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logTool('web_search', `Cache hit: "${query}"`);
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return { ...(cached as Record<string, unknown>), from_cache: true };
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}
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let results: SearchResult[];
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let mode: string;
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let engineStats: Record<string, string>;
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if (searxngConfig.enabled && searxngConfig.url) {
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const searxResult = await this.searchSearXNG(query, searxngConfig, maxResults, timeRange);
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results = searxResult.results;
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mode = 'searxng';
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engineStats = searxResult.engineStats;
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} else {
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const builtinResult = await this.searchBuiltinEngines(query, maxResults, timeRange);
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results = builtinResult.results;
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mode = 'builtin';
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engineStats = builtinResult.engineStats;
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}
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// 合并去重
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const deduped = this.deduplicate(results);
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// 可达性预检
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const topUrls = deduped.slice(0, Math.min(20, deduped.length)).map((r) => r.url);
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const reachabilityMap = await checkReachability(topUrls);
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for (const r of deduped) {
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r.reachable = reachabilityMap.get(r.url) ?? false;
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}
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// 智能排序
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const sorted = smartSort(deduped, reachabilityMap).slice(0, maxResults);
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// 摘要增强
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if (enhanceSnippets) {
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await this.enhanceSnippets(sorted, 3);
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}
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// 自动抓取完整内容
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const fetchedContent = await this.autoFetch(query, sorted, searxngConfig.fetch_mode, fetchTop);
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// 格式化输出
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const formatted = this.formatResults(query, sorted);
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const output = {
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success: true,
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query,
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results: sorted.map((r) => ({
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title: r.title,
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url: r.url,
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snippet: r.snippet,
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engine: r.engine,
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reachable: r.reachable,
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_score: r._score ? Math.round(r._score * 10) / 10 : undefined,
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_enhanced: r._enhanced,
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})),
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total: sorted.length,
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formatted,
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from_cache: false,
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engine_stats: engineStats,
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_mode: mode,
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_fetched: fetchedContent.map((f) => ({ url: f.url, title: f.title, content: f.content })),
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_fetched_count: fetchedContent.length,
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};
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// 写入缓存
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searchCache.set(cacheKey, output);
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logTool('web_search', `Completed: ${sorted.length} results, ${fetchedContent.length} fetched, mode=${mode}`);
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return output;
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}
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// ===== SearXNG 搜索 =====
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private async searchSearXNG(
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query: string,
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config: SearXNGConfig,
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maxResults: number,
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timeRange: string,
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): Promise<{ results: SearchResult[]; engineStats: Record<string, string> }> {
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const params = new URLSearchParams();
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params.set('q', query);
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params.set('format', config.format || 'json');
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if (config.engines) params.set('engines', config.engines);
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if (config.language && config.language !== 'auto') params.set('language', config.language);
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params.set('safesearch', String(config.safesearch));
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const tr = timeRange || config.time_range;
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if (tr) params.set('time_range', tr);
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const limit = Math.max(maxResults, config.max_results);
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if (limit > 0) params.set('results_count', String(limit));
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const searchUrl = `${config.url.replace(/\/$/, '')}/search?${params.toString()}`;
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const headers = buildSearXNGAuthHeaders(config.auth_key, config.auth_type);
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logTool('web_search', `[SearXNG] Fetching: ${searchUrl}`);
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const response = await fetchWithTimeout(searchUrl, { headers }, 15_000);
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if (!response.ok) {
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throw new Error(`SearXNG API error: ${response.status} ${response.statusText}`);
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}
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const results: SearchResult[] = [];
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const engineStats: Record<string, string> = {};
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const engineCounts = new Map<string, number>();
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if (config.format === 'html') {
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const html = await response.text();
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// HTML 模式：简单提取链接和标题
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const matches = html.matchAll(/<a[^>]*href="(https?:\/\/[^"]+)"[^>]*>([\s\S]*?)<\/a>/gi);
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for (const m of matches) {
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const url = m[1];
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const title = m[2].replace(/<[^>]+>/g, '').trim();
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if (title && url && !url.includes(config.url)) {
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results.push({ title, url, snippet: '', engine: 'searxng', weight: 85 });
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}
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}
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} else {
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const data = await response.json() as { results?: Array<Record<string, unknown>> };
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for (const item of data.results ?? []) {
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const url = item.url as string;
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const title = item.title as string;
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const snippet = item.content as string;
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const engine = (item.engine as string) ?? 'searxng';
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results.push({ title, url, snippet: snippet ?? '', engine, weight: 85 });
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engineCounts.set(engine, (engineCounts.get(engine) ?? 0) + 1);
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}
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}
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for (const [engine, count] of engineCounts) {
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engineStats[engine] = `${count} 条`;
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}
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return { results, engineStats };
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}
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// ===== 内置四引擎并行搜索 =====
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private async searchBuiltinEngines(
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query: string,
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maxResults: number,
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timeRange: string,
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): Promise<{ results: SearchResult[]; engineStats: Record<string, string> }> {
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const searchPromises = ENGINES.map(async (engine) => {
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try {
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const url = engine.searchUrl(query, timeRange);
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const response = await fetchWithTimeout(url, {
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headers: {
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'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/131.0.0.0 Safari/537.36',
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'Accept-Language': 'zh-CN,zh;q=0.9,en;q=0.8',
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},
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}, 8_000);
|
||
|
||
if (!response.ok) {
|
||
logTool('web_search', `[内置] ${engine.name} HTTP ${response.status}`);
|
||
return [];
|
||
}
|
||
|
||
const html = await response.text();
|
||
const parsed = engine.parse(html);
|
||
logTool('web_search', `[内置] ${engine.name}: ${parsed.length} results`);
|
||
return parsed;
|
||
} catch (err) {
|
||
logTool('web_search', `[内置] ${engine.name} error: ${(err as Error).message}`);
|
||
return [];
|
||
}
|
||
});
|
||
|
||
const settled = await Promise.allSettled(searchPromises);
|
||
const allResults: SearchResult[] = [];
|
||
const engineStats: Record<string, string> = {};
|
||
|
||
for (let i = 0; i < ENGINES.length; i++) {
|
||
const result = settled[i];
|
||
const engineName = ENGINES[i].name;
|
||
if (result.status === 'fulfilled') {
|
||
allResults.push(...result.value);
|
||
engineStats[engineName] = `${result.value.length} 条`;
|
||
} else {
|
||
engineStats[engineName] = '失败';
|
||
}
|
||
}
|
||
|
||
return { results: allResults, engineStats };
|
||
}
|
||
|
||
// ===== 合并去重 =====
|
||
|
||
private deduplicate(results: SearchResult[]): SearchResult[] {
|
||
const seen = new Map<string, SearchResult>();
|
||
for (const r of results) {
|
||
const normalized = normalizeUrl(r.url);
|
||
if (!seen.has(normalized)) {
|
||
seen.set(normalized, r);
|
||
}
|
||
}
|
||
return Array.from(seen.values());
|
||
}
|
||
|
||
// ===== 摘要增强（委托给 WebFetchTool） =====
|
||
|
||
private async enhanceSnippets(results: SearchResult[], maxEnhance: number): Promise<void> {
|
||
let enhanced = 0;
|
||
for (const r of results) {
|
||
if (enhanced >= maxEnhance) break;
|
||
if (r.snippet.length < 30 && r.reachable) {
|
||
try {
|
||
const fetchResult = await this.webFetchTool.execute(
|
||
{ url: r.url },
|
||
{ sessionId: '', workspacePath: '', iteration: 0, requestId: '' },
|
||
) as { success: boolean; content?: string };
|
||
|
||
if (fetchResult.success && fetchResult.content) {
|
||
const text = fetchResult.content.slice(0, 200);
|
||
if (text.length > r.snippet.length) {
|
||
r.snippet = text;
|
||
r._enhanced = true;
|
||
enhanced++;
|
||
}
|
||
}
|
||
} catch {
|
||
// 忽略增强失败
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// ===== 自动抓取完整内容（委托给 WebFetchTool） =====
|
||
|
||
private async autoFetch(
|
||
query: string,
|
||
results: SearchResult[],
|
||
fetchMode: string,
|
||
fetchTop: number,
|
||
): Promise<Array<{ url: string; title: string; content: string }>> {
|
||
// 相关性评分（不过滤，relevance=0 的结果也参与抓取候选）
|
||
const withRelevance = results.map((r) => ({ result: r, relevance: computeRelevance(query, r) }));
|
||
const filtered = withRelevance.length > 0 ? withRelevance : [];
|
||
|
||
// 确定抓取数量：fetchTop 已在 execute() 中综合了配置面板和工具参数
|
||
const topN = Math.min(fetchTop, 8, filtered.length);
|
||
|
||
// 构建抓取列表
|
||
let toFetch: typeof filtered;
|
||
if (fetchMode === 'random') {
|
||
// Fisher-Yates 洗牌
|
||
const shuffled = [...filtered];
|
||
for (let i = shuffled.length - 1; i > 0; i--) {
|
||
const j = Math.floor(Math.random() * (i + 1));
|
||
[shuffled[i], shuffled[j]] = [shuffled[j], shuffled[i]];
|
||
}
|
||
toFetch = shuffled.slice(0, topN);
|
||
} else {
|
||
toFetch = filtered
|
||
.sort((a, b) => b.relevance - a.relevance)
|
||
.slice(0, topN);
|
||
}
|
||
|
||
const fetched: Array<{ url: string; title: string; content: string }> = [];
|
||
|
||
for (const item of toFetch) {
|
||
try {
|
||
// 委托给 WebFetchTool — 享受三阶段回退策略（HTTP + 反爬 + 浏览器渲染）
|
||
const fetchResult = await this.webFetchTool.execute(
|
||
{ url: item.result.url },
|
||
{ sessionId: '', workspacePath: '', iteration: 0, requestId: '' },
|
||
) as { success: boolean; content?: string; method?: string };
|
||
|
||
if (fetchResult.success && fetchResult.content) {
|
||
fetched.push({ url: item.result.url, title: item.result.title, content: fetchResult.content });
|
||
}
|
||
} catch (err) {
|
||
logTool('web_search', `Auto-fetch failed for ${item.result.url}: ${(err as Error).message}`);
|
||
// 从剩余结果中随机补充
|
||
const remaining = withRelevance.filter((x) => !toFetch.includes(x) && !fetched.some((f) => f.url === x.result.url));
|
||
if (remaining.length > 0) {
|
||
const randomPick = remaining[Math.floor(Math.random() * remaining.length)];
|
||
try {
|
||
const fetchResult2 = await this.webFetchTool.execute(
|
||
{ url: randomPick.result.url },
|
||
{ sessionId: '', workspacePath: '', iteration: 0, requestId: '' },
|
||
) as { success: boolean; content?: string };
|
||
|
||
if (fetchResult2.success && fetchResult2.content) {
|
||
fetched.push({ url: randomPick.result.url, title: randomPick.result.title, content: fetchResult2.content });
|
||
}
|
||
} catch {
|
||
// 忽略补充失败
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
return fetched;
|
||
}
|
||
|
||
// ===== 格式化人类可读输出 =====
|
||
|
||
private formatResults(query: string, results: SearchResult[]): string {
|
||
if (results.length === 0) return `搜索 "${query}" 无结果。`;
|
||
const lines = [`搜索 "${query}" — ${results.length} 条结果：\n`];
|
||
results.forEach((r, i) => {
|
||
lines.push(`${i + 1}. ${r.title}`);
|
||
lines.push(` URL: ${r.url}`);
|
||
if (r.snippet) lines.push(` 摘要: ${r.snippet.slice(0, 150)}`);
|
||
lines.push(` 来源: ${r.engine}${r.reachable === false ? ' (不可达)' : ''}${r._enhanced ? ' [已增强]' : ''}\n`);
|
||
});
|
||
return lines.join('\n');
|
||
}
|
||
|
||
// ===== 读取 SearXNG 配置 =====
|
||
|
||
private readSearXNGConfig(): SearXNGConfig {
|
||
const cs = this.configService;
|
||
return {
|
||
enabled: cs.get<boolean>('searxng.enabled') ?? false,
|
||
url: cs.get<string>('searxng.url') ?? '',
|
||
engines: cs.get<string>('searxng.engines') ?? '',
|
||
language: cs.get<string>('searxng.language') ?? 'zh-CN',
|
||
safesearch: cs.get<number>('searxng.safesearch') ?? 1,
|
||
time_range: cs.get<string>('searxng.time_range') ?? '',
|
||
max_results: cs.get<number>('searxng.max_results') ?? 0,
|
||
auth_key: cs.get<string>('searxng.auth_key') ?? '',
|
||
auth_type: cs.get<string>('searxng.auth_type') ?? 'bearer',
|
||
format: cs.get<string>('searxng.format') ?? 'json',
|
||
fetch_count: cs.get<number>('searxng.fetch_count') ?? 0,
|
||
fetch_mode: cs.get<string>('searxng.fetch_mode') ?? 'sequential',
|
||
};
|
||
}
|
||
}
|