fix(test2): 稳定语音知识库回复并补齐热门问法覆盖

test2/server/services/contextKeywordTracker.js

@@ -0,0 +1,121 @@
+/**
+ * 零 LLM 上下文关键词追踪器
+ * 记忆最近的产品/主题关键词，用于追问理解
+ */
+
+class ContextKeywordTracker {
+  constructor() {
+    this.sessionKeywords = new Map();
+    this.TTL = 30 * 60 * 1000;
+    this.MAX_KEYWORDS = 8;
+    this.keywordPatterns = [
+      /(一成系统|Ai众享|AI众享|数字化工作室|盛咖学愿|数字化运营|数字化经营|数字化营销|数字化创业|数字化事业)/gi,
+      /(PM-FitLine|PM细胞营养素|细胞营养素|德国PM|PM公司)/gi,
+      /(小红产品|大白产品|小白产品|Activize Oxyplus|Activize|Basics|Restorate|儿童倍适|Basic Power|CitrusCare|NutriSunny|Omega)/gi,
+      /(肽美|艾特维|德丽|德维|宝丽|美固健|葡萄籽|白藜芦醇|益生菌|胶原蛋白肽|Q10)/gi,
+      /(NTC营养保送系统|火炉原理|阿育吠陀|招商|加盟|代理|事业机会|招商加盟|合作加盟|事业合作)/gi,
+    ];
+    this.cleanupTimer = setInterval(() => this.cleanup(), this.TTL);
+    if (typeof this.cleanupTimer.unref === 'function') {
+      this.cleanupTimer.unref();
+    }
+  }
+
+  extractKeywords(text) {
+    const keywords = [];
+    const normalized = String(text || '').trim();
+    if (!normalized) {
+      return keywords;
+    }
+
+    for (const pattern of this.keywordPatterns) {
+      const matches = normalized.match(pattern);
+      if (matches && matches.length > 0) {
+        keywords.push(...matches);
+      }
+    }
+
+    const deduped = [];
+    for (const keyword of keywords) {
+      const normalizedKeyword = String(keyword || '').trim();
+      if (!normalizedKeyword) {
+        continue;
+      }
+      if (!deduped.some((item) => item.toLowerCase() === normalizedKeyword.toLowerCase())) {
+        deduped.push(normalizedKeyword);
+      }
+    }
+    return deduped;
+  }
+
+  mergeKeywords(existing, incoming) {
+    const merged = Array.isArray(existing) ? [...existing] : [];
+    for (const keyword of Array.isArray(incoming) ? incoming : []) {
+      const normalizedKeyword = String(keyword || '').trim();
+      if (!normalizedKeyword) {
+        continue;
+      }
+      const existingIndex = merged.findIndex((item) => String(item || '').toLowerCase() === normalizedKeyword.toLowerCase());
+      if (existingIndex >= 0) {
+        merged.splice(existingIndex, 1);
+      }
+      merged.push(normalizedKeyword);
+    }
+    return merged.slice(-this.MAX_KEYWORDS);
+  }
+
+  updateSession(sessionId, text) {
+    if (!sessionId) {
+      return;
+    }
+    const keywords = this.extractKeywords(text);
+    if (keywords.length > 0) {
+      const existing = this.sessionKeywords.get(sessionId)?.keywords || [];
+      const merged = this.mergeKeywords(existing, keywords);
+      this.sessionKeywords.set(sessionId, {
+        keywords: merged,
+        lastUpdate: Date.now(),
+      });
+    }
+  }
+
+  getSessionKeywords(sessionId) {
+    const data = this.sessionKeywords.get(sessionId);
+    if (!data) return [];
+    if (Date.now() - data.lastUpdate > this.TTL) {
+      this.sessionKeywords.delete(sessionId);
+      return [];
+    }
+    return data.keywords;
+  }
+
+  enrichQueryWithContext(sessionId, query) {
+    const normalized = (query || '').trim();
+    const keywords = this.getSessionKeywords(sessionId);
+
+    if (keywords.length === 0) {
+      return normalized;
+    }
+
+    const isSimpleFollowUp = /^(这个|那个|它|该|这款|那款|详细|继续|怎么|为什么|适合谁|什么意思|怎么吃|怎么用|功效|成分|多少钱|哪里买|价格|副作用|正规吗|地址|电话|联系方式|区别|哪个好)/i.test(normalized);
+
+    if (isSimpleFollowUp) {
+      const keywordStr = keywords.slice(-3).join(' ');
+      console.log(`[ContextTracker] Enriching: "${normalized}" + "${keywordStr}"`);
+      return `${keywordStr} ${normalized}`;
+    }
+
+    return normalized;
+  }
+
+  cleanup() {
+    const now = Date.now();
+    for (const [sessionId, data] of this.sessionKeywords) {
+      if (now - data.lastUpdate > this.TTL) {
+        this.sessionKeywords.delete(sessionId);
+      }
+    }
+  }
+}
+
+module.exports = new ContextKeywordTracker();