node.js - 无法使用 firebase 函数将字节数组图像上传到 fire-storage

Question

我无法使用云函数将字节数组格式的图像文件上传到 firestore。下面的代码在本地使用 app.listen() 工作正常，但是当我尝试使用 exports 函数时它不起作用

const functions = require('firebase-functions');
const { Storage } = require('@google-cloud/storage');
const express = require('express');
var app = express();
var fs = require('fs');

// Your Google Cloud Platform project ID
const projectId ='<project-Id>';

// Creates a client
const storage = new Storage({
projectId: projectId,
keyFilename: '<>'
});


const bucket = storage.bucket("<bucket-name>");

// Byte aray to Image 

function saveImage(filename, data) {
console.log("inside saveImage", data.length);
var myBuffer = new Buffer.alloc(data.length);
for (var i = 0; i < data.length; i++) {
    myBuffer[i] = data[i];
}
console.log(myBuffer)
fs.createWriteStream(filename, myBuffer, 'binary', function (err) {
    console.log("inside writeFile");
    if (err) {
        console.log('error inside fs', err);
    } else {
        console.log("The file was saved!");
    }
 });
}

saveImage("image1.png", result);


app.use(function (req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, 
Content-Type, Accept");
next();
});



exports.UploadImage = functions.https.onRequest(app);

谁能帮帮我。提前致谢

Answer 1

这是我使用 Firebase Functions 和 Google Cloud Pub/Sub 将文件上传到 Firebase Storage 时最终得到的解决方案。

NOTE Pub/Sub is optional and only worked for my use case

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

function saveImage(filename, data) {
    const bucket = admin.storage().bucket();
    const imageBuffer = new Uint8Array(data);
    const file = bucket.file(`optional_sub_directory/${filename}`, {
        uploadType: {resumable: false}
    });

    file.save(imageBuffer, (err) => {
        if (err) {
            console.error(`Error uploading: ${filename} with message: ${err.message}`);
            return;
        }

        console.log('Uploaded file');
    });
}

exports.helloPubSub = functions.pubsub
    .topic('demo-topic')
    .onPublish(async(message) => {
        /**
         *  Here goes code to extract the file buffer
         */

        const buffer = /** buffer */

        saveImage("stack_overflow.txt", buffer);
    });