如何使用 OpenAI Node.js SDK 构建代理

import OpenAI from "openai";
 
const openai = new OpenAI({
  apiKey: process.env.OPENAI_API_KEY,
  dangerouslyAllowBrowser: true,
});

async function getLocation() {
  const response = await fetch("https://ipapi.co/json/");
  const locationData = await response.json();
  return locationData;
}

async function getCurrentWeather(latitude, longitude) {
  const url = `https://api.open-meteo.com/v1/forecast?latitude=${latitude}&longitude=${longitude}&hourly=apparent_temperature`;
  const response = await fetch(url);
  const weatherData = await response.json();
  return weatherData;
}

const tools = [
  {
    type: "function",
    function: {
      name: "getCurrentWeather",
      description: "Get the current weather in a given location",
      parameters: {
        type: "object",
        properties: {
          latitude: {
            type: "string",
          },
          longitude: {
            type: "string",
          },
        },
        required: ["longitude", "latitude"],
      },
    }
  },
  {
    type: "function",
    function: {
      name: "getLocation",
      description: "Get the user's location based on their IP address",
      parameters: {
        type: "object",
        properties: {},
      },
    }
  },
];

const messages = [
  {
    role: "system",
    content:
      "You are a helpful assistant. Only use the functions you have been provided with.",
  },
];

async function agent(userInput) {
  messages.push({
    role: "user",
    content: userInput,
  });
  const response = await openai.chat.completions.create({
    model: "gpt-4",
    messages: messages,
    tools: tools,
  });
  console.log(response);
}

agent("Where am I located right now?");

{
    id: "chatcmpl-84ojoEJtyGnR6jRHK2Dl4zTtwsa7O",
    object: "chat.completion",
    created: 1696159040,
    model: "gpt-4-0613",
    choices: [{
        index: 0,
        message: {
            role: "assistant",
            content: null,
            tool_calls: [
              id: "call_CBwbo9qoXUn1kTR5pPuv6vR1",
              type: "function",
              function: {
                name: "getLocation",
                arguments: "{}"
              }
            ]
        },
        logprobs: null,
        finish_reason: "tool_calls" // OpenAI wants us to call a function
    }],
    usage: {
        prompt_tokens: 134,
        completion_tokens: 6,
        total_tokens: 140
    }
     system_fingerprint: null
}

const availableTools = {
  getCurrentWeather,
  getLocation,
};

const { finish_reason, message } = response.choices[0];
 
if (finish_reason === "tool_calls" && message.tool_calls) {
  const functionName = message.tool_calls[0].function.name;
  const functionToCall = availableTools[functionName];
  const functionArgs = JSON.parse(message.tool_calls[0].function.arguments);
  const functionArgsArr = Object.values(functionArgs);
  const functionResponse = await functionToCall.apply(null, functionArgsArr);
  console.log(functionResponse);
}

{ip: "193.212.60.170", network: "193.212.60.0/23", version: "IPv4", city: "Oslo", region: "Oslo County", region_code: "03", country: "NO", country_name: "Norway", country_code: "NO", country_code_iso3: "NOR", country_capital: "Oslo", country_tld: ".no", continent_code: "EU", in_eu: false, postal: "0026", latitude: 59.955, longitude: 10.859, timezone: "Europe/Oslo", utc_offset: "+0200", country_calling_code: "+47", currency: "NOK", currency_name: "Krone", languages: "no,nb,nn,se,fi", country_area: 324220, country_population: 5314336, asn: "AS2119", org: "Telenor Norge AS"}

messages.push({
  role: "function",
  name: functionName,
  content: `The result of the last function was this: ${JSON.stringify(
    functionResponse
  )}
  `,
});

for (let i = 0; i < 5; i++) {
  const response = await openai.chat.completions.create({
    model: "gpt-4",
    messages: messages,
    tools: tools,
  });
  const { finish_reason, message } = response.choices[0];
 
  if (finish_reason === "tool_calls" && message.tool_calls) {
    const functionName = message.tool_calls[0].function.name;
    const functionToCall = availableTools[functionName];
    const functionArgs = JSON.parse(message.tool_calls[0].function.arguments);
    const functionArgsArr = Object.values(functionArgs);
    const functionResponse = await functionToCall.apply(null, functionArgsArr);
 
    messages.push({
      role: "function",
      name: functionName,
      content: `
          The result of the last function was this: ${JSON.stringify(
            functionResponse
          )}
          `,
    });
  } else if (finish_reason === "stop") {
    messages.push(message);
    return message.content;
  }
}
return "The maximum number of iterations has been met without a suitable answer. Please try again with a more specific input.";

const response = await agent(
  "Please suggest some activities based on my location and the current weather."
);
console.log(response);

Based on your current location in Oslo, Norway and the weather (15°C and snowy),
here are some activity suggestions:
 
1. A visit to the Oslo Winter Park for skiing or snowboarding.
2. Enjoy a cosy day at a local café or restaurant.
3. Visit one of Oslo's many museums. The Fram Museum or Viking Ship Museum offer interesting insights into Norway’s seafaring history.
4. Take a stroll in the snowy streets and enjoy the beautiful winter landscape.
5. Enjoy a nice book by the fireplace in a local library.
6. Take a fjord sightseeing cruise to enjoy the snowy landscapes.
 
Always remember to bundle up and stay warm. Enjoy your day!

{"role":"assistant","content":null,"tool_calls":[{"id":"call_Cn1KH8mtHQ2AMbyNwNJTweEP","type":"function","function":{"name":"getLocation","arguments":"{}"}}]}
{"role":"assistant","content":null,"tool_calls":[{"id":"call_uc1oozJfGTvYEfIzzcsfXfOl","type":"function","function":{"name":"getCurrentWeather","arguments":"{\n\"latitude\": \"10.859\",\n\"longitude\": \"59.955\"\n}"}}]}