使用 nodeJS 从头开始​​创建 ReAct Agent（维基百科搜索）

mkdir react-agent-project
cd react-agent-project
npm init -y
npm install axios dotenv @google/generative-ai

google_ai_api_key=your_api_key_here

const axios = require("axios");

class tools {
  static async wikipedia(q) {
    try {
      const response = await axios.get("https://en.wikipedia.org/w/api.php", {
        params: {
          action: "query",
          list: "search",
          srsearch: q,
          srwhat: "text",
          format: "json",
          srlimit: 4,
        },
      });

      const results = await promise.all(
        response.data.query.search.map(async (searchresult) => {
          const sectionresponse = await axios.get(
            "https://en.wikipedia.org/w/api.php",
            {
              params: {
                action: "parse",
                pageid: searchresult.pageid,
                prop: "sections",
                format: "json",
              },
            },
          );

          const sections = object.values(
            sectionresponse.data.parse.sections,
          ).map((section) => `${section.index}, ${section.line}`);

          return {
            pagetitle: searchresult.title,
            snippet: searchresult.snippet,
            pageid: searchresult.pageid,
            sections: sections,
          };
        }),
      );

      return results
        .map(
          (result) =>
            `snippet: ${result.snippet}\npageid: ${result.pageid}\nsections: ${json.stringify(result.sections)}`,
        )
        .join("\n\n");
    } catch (error) {
      console.error("error fetching from wikipedia:", error);
      return "error fetching data from wikipedia";
    }
  }

  static async wikipedia_with_pageid(pageid, sectionid) {
    if (sectionid) {
      const response = await axios.get("https://en.wikipedia.org/w/api.php", {
        params: {
          action: "parse",
          format: "json",
          pageid: parseint(pageid),
          prop: "wikitext",
          section: parseint(sectionid),
          disabletoc: 1,
        },
      });
      return object.values(response.data.parse?.wikitext ?? {})[0]?.substring(
        0,
        25000,
      );
    } else {
      const response = await axios.get("https://en.wikipedia.org/w/api.php", {
        params: {
          action: "query",
          pageids: parseint(pageid),
          prop: "extracts",
          exintro: true,
          explaintext: true,
          format: "json",
        },
      });
      return object.values(response.data?.query.pages)[0]?.extract;
    }
  }
}

module.exports = tools;

require("dotenv").config();
const { googlegenerativeai } = require("@google/generative-ai");
const tools = require("./tools");

const genai = new googlegenerativeai(process.env.google_ai_api_key);

class reactagent {
  constructor(query, functions) {
    this.query = query;
    this.functions = new set(functions);
    this.state = "thought";
    this._history = [];
    this.model = genai.getgenerativemodel({
      model: "gemini-1.5-flash",
      temperature: 2,
    });
  }

  get history() {
    return this._history;
  }

  pushhistory(value) {
    this._history.push(`\n ${value}`);
  }

  async run() {
    this.pushhistory(`**task: ${this.query} **`);
    try {
      return await this.step();
    } catch (e) {
      if (e.message.includes("exhausted")) {
        return "sorry, i'm exhausted, i can't process your request anymore. >>>>>>>", finalanswer);
    return finalanswer;
  }
}

module.exports = reactagent;

const ReActAgent = require("./ReactAgent.js");

async function main() {
  const query = "What does England border with?";
  const functions = [
    [
      "wikipedia",
      "params: query",
      "Semantic Search Wikipedia API for snippets, pageIds and sectionIds >> \n ex: Date brazil has been colonized? \n Brazil was colonized at 1500, pageId, sections : []",
    ],
    [
      "wikipedia_with_pageId",
      "params : pageId, sectionId",
      "Search Wikipedia API for data using a pageId and a sectionIndex as params.  \n ex: 1500, 1234 \n Section information about blablalbal",
    ],
  ];

  const agent = new ReActAgent(query, functions);
  try {
    const result = await agent.run();
    console.log("THE AGENT RETURN THE FOLLOWING >>>", result);
  } catch (e) {
    console.log("FAILED TO RUN T.T", e);
  }
}

main().catch(console.error);