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Using OpenAI API from Firebase Cloud Functions in flutter app

article 2024/9/21 14:03:44

题意：“在 Flutter 应用中通过 Firebase Cloud Functions 使用 OpenAI API。”

问题背景：

I can't figure out how to make this work.

“我不知道该如何让这正常运行。”

This is my cloud function in Javascript. I'm trying a simple code to see if the connection works (other cloud functions not using the openai package do work fine).

“这是我用 JavaScript 编写的云函数。我正在尝试一个简单的代码来测试连接是否正常（其他不使用 openai 包的云函数运行良好）。”

The function does work on GCP when I test it, but won't connect to my flutter function for some reason:

“该函数在 GCP 上测试时可以运行，但由于某种原因无法连接到我的 Flutter 函数。”

error:

flutter: Error calling Firebase Function: internal Response is missing data field.

Cloud function

const functions = require('firebase-functions');
const admin = require('firebase-admin');
const axios = require('axios');
const cors = require('cors')({ origin: true });
admin.initializeApp();

exports.openAiResponse2 = functions.https.onRequest(async (request, response) => {
  const apiKey = 'sk-';
  cors(request, response, async () => {
    try {
      const apiResponse = await axios.post(
        'https://api.openai.com/v1/chat/completions',
        {
          model: 'gpt-3.5-turbo',
          messages: [{ role: 'user', content: 'Say this is a test!' }],
          temperature: 0.7,
        },
        {
          headers: {
            'Authorization': `Bearer ${apiKey}`,
            'Content-Type': 'application/json',
          },
        },
      );

     // response.status(200).json({ message: 'OpenAI API connection successful.', engines: apiResponse.data });
        response.status(200).json({
              message: 'OpenAI API connection successful.',
              completion: apiResponse.data.choices[0].message.content,
            });
    } catch (error) {
      console.error('Error connecting to OpenAI API:', error);
      response.status(500).send('Error connecting to OpenAI API');
    }
  });
});

Flutter:

Future<void> talkToMe2() async {
  try {
    HttpsCallable callable = FirebaseFunctions.instance.httpsCallable('openAiResponse2');
    print(callable);
    final response = await callable.call();
    print('response is $response');
    print('External API response: ${response.data}');
  } on FirebaseFunctionsException catch (e) {
    print('Error calling Firebase Function: ${e.code} ${e.message}');
  } catch (e) {
    print('Error calling Firebase Function: $e');
  }
}

This is my package.json

{
  "name": "functions",
  "description": "Cloud Functions for Firebase",
  "scripts": {
    "serve": "firebase emulators:start --only functions",
    "shell": "firebase functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions",
    "logs": "firebase functions:log"
  },
  "engines": {
    "node": "16"
  },
  "main": "index.js",
  "dependencies": {
    "firebase-admin": "^11.5.0",
    "firebase-functions": "^4.2.0",
    "openai": "^3.2.1"
  },
  "devDependencies": {
    "firebase-functions-test": "^3.0.0"
  },
  "private": true
}

And my flutter doctor

[✓] Flutter (Channel stable, 3.7.12, on macOS 13.2 22D49 darwin-arm64, locale en-ES)
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0-rc1)
[✓] Xcode - develop for iOS and macOS (Xcode 14.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.1)
[✓] VS Code (version 1.77.3)
[✓] Connected device (4 available)
[✓] HTTP Host Availability

I can't seem to find a solution. Thanks!

“我似乎找不到解决方案。谢谢！”

问题解决：

I am not a flutter developer but httpsCallable is for onCall not onRequest.

“我不是 Flutter 开发者，但 `httpsCallable` 是用于 `onCall` 而不是 `onRequest`。”

https://firebase.google.com/docs/functions/callable?gen=2nd

https://firebase.google.com/docs/functions/http-events?gen=2nd

If you look at the flutter sample, you should have something like below for https callable

“如果你查看 Flutter 示例，针对 https callable，你应该有类似下面的代码。”

const functions = require('firebase-functions');

exports.listFruit = functions.https.onCall((data, context) => { //<<<-- not onRequest
  return ["Apple", "Banana", "Cherry", "Date", "Fig", "Grapes"]
});