文档太复杂了,我无法理解。它演示了如何将文件从 Cloud Storage 下载到 Cloud Functions、操作该文件,然后将新文件上传到 Cloud Storage。我只想了解将文件从 Cloud Functions 上传到 Cloud Storage 的基本、最低限度说明。为什么这不起作用:
const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
exports.storage = functions.firestore.document('Test_Value').onUpdate((change, context) => {
var metadata = {
contentType: 'text',
};
admin.storage().ref().put( {'test': 'test'}, metadata)
.then(function() {
console.log("Document written.");
})
.catch(function(error) {
console.error(error);
})
});
错误消息是
admin.storage(...).ref is not a function
。我猜 firebase-admin
包括 Firestore 但不包括 Storage?我应该使用 firebase-admin
而不是 @google-cloud/storage
吗?为什么这不起作用:
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const {Storage} = require('@google-cloud/storage')();
const storage = new Storage();
admin.initializeApp();
exports.storage = functions.firestore.document('Test_Value').onUpdate((change, context) => {
storage.bucket().upload( {'test': 'test'} , {
metadata: {
contentType: 'text'
}
})
});
我什至无法部署此代码,错误消息是
Error parsing triggers: Cannot find module './clone.js'
显然缺少 npm 模块依赖项?但这个模块不叫
clone.js
吗?我尝试要求 child-process-promise
、path
、os
和 fs
;没有修复丢失的 clone.js
错误。
为什么
admin.initializeApp();
缺少参数,而在我的 index.html
文件中我有:
firebase.initializeApp({
apiKey: 'swordfish',
authDomain: 'myapp.firebaseapp.com',
databaseURL: "https://myapp.firebaseio.com",
projectId: 'myapp',
storageBucket: "myapp.appspot.com"
});
我看到的另一个问题:
npm list -g --depth=0
/Users/TDK/.nvm/versions/node/v6.11.2/lib
├── [email protected]
├── UNMET PEER DEPENDENCY error: ENOENT: no such file or directory, open '/Users/TDK/.nvm/versions/node/v6.11.2/lib/node_modules/firebase-admin/package.json
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
└── [email protected]
换句话说,
firebase-admin
或Node 6.11.2
有问题。我应该使用节点版本管理器恢复到旧版本的节点吗?
App Engine default service account
+ ADD ANOTHER ROLE
Cloud Functions Service Agent
在我的特定用例中,我需要将 Base64 字符串解码为字节数组,然后使用它来保存图像。
var serviceAccount = require("./../serviceAccountKey.json");
import * as functions from 'firebase-functions';
import * as admin from 'firebase-admin';
admin.initializeApp({
projectId: serviceAccount.project_id,
credential: admin.credential.cert(serviceAccount),
databaseURL: "https://your_project_id_here.firebaseio.com", //update this
storageBucket: "your_bucket_name_here.appspot.com" //update this
});
function uploadProfileImage(imageBytes64Str: string): Promise<any> {
const bucket = admin.storage().bucket()
const imageBuffer = Buffer.from(imageBytes64Str, 'base64')
const imageByteArray = new Uint8Array(imageBuffer);
const file = bucket.file(`images/profile_photo.png`);
const options = { resumable: false, metadata: { contentType: "image/jpg" } }
//options may not be necessary
return file.save(imageByteArray, options)
.then(stuff => {
return file.getSignedUrl({
action: 'read',
expires: '03-09-2500'
})
})
.then(urls => {
const url = urls[0];
console.log(`Image url = ${url}`)
return url
})
.catch(err => {
console.log(`Unable to upload image ${err}`)
})
}
然后您可以像这样调用该方法并链接调用。
uploadProfileImage(image_bytes_here)
.then(url => {
//Do stuff with the url here
})
注意:您必须使用服务帐户初始化 admin 并指定默认存储桶。 如果您只是这样做
admin.initializeApp()
那么您的图片网址将在 10 天后过期。
正确使用服务帐户的步骤。
参见管理云存储简介 API 进一步了解 有关如何在 Firebase Admin SDK 中使用云存储服务的详细信息。
var admin = require("firebase-admin"); var serviceAccount = require("path/to/serviceAccountKey.json"); admin.initializeApp({ credential: admin.credential.cert(serviceAccount), storageBucket: "<BUCKET_NAME>.appspot.com" }); var bucket = admin.storage().bucket(); // 'bucket' is an object defined in the @google-cloud/storage library. // See https://googlecloudplatform.github.io/google-cloud-node/#/docs/storage/latest/storage/bucket // for more details.
关于上传对象,请参见云存储文档上传对象示例代码:
// Imports the Google Cloud client library const {Storage} = require('@google-cloud/storage'); // Creates a client const storage = new Storage(); /** * TODO(developer): Uncomment the following lines before running the sample. */ // const bucketName = 'Name of a bucket, e.g. my-bucket'; // const filename = 'Local file to upload, e.g. ./local/path/to/file.txt'; // Uploads a local file to the bucket await storage.bucket(bucketName).upload(filename, { // Support for HTTP requests made with `Accept-Encoding: gzip` gzip: true, metadata: { // Enable long-lived HTTP caching headers // Use only if the contents of the file will never change // (If the contents will change, use cacheControl: 'no-cache') cacheControl: 'public, max-age=31536000', }, }); console.log(`${filename} uploaded to ${bucketName}.`);
我通过 Google Cloud Functions 将文件从硬盘上传到 Firebase Cloud Storage。首先,我找到了 Google Cloud Functions 的文档bucket.upload。
const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
exports.Storage = functions.firestore.document('Storage_Value').onUpdate((change, context) => {
const {Storage} = require('@google-cloud/storage');
const storage = new Storage();
const bucket = storage.bucket('myapp.appspot.com');
const options = {
destination: 'Test_Folder/hello_world.dog'
};
bucket.upload('hello_world.ogg', options).then(function(data) {
const file = data[0];
});
return 0;
});
前三行是 Cloud Functions 样板。下一行
exports.Storage = functions.firestore.document('Storage_Value').onUpdate((change, context) => {
创建云函数并设置触发器。接下来的三行更多的是 Google Cloud 样板。
其余代码在我的计算机硬盘驱动器上的项目目录的
hello_world.ogg
文件夹中找到文件 functions
并将其上传到目录 Test_Folder
并在我的 Firebase 中将该文件的名称更改为 hello_world.dog
云储存。这会返回一个承诺,并且下一行 const file = data[0];
是不必要的,除非您想对文件执行其他操作。
最后我们
return 0;
。该行除了防止出现错误消息之外什么也不做
Function returned undefined, expected Promise or Value
对于来到这里的人们,想知道为什么他们在本地调试时没有收到错误,但文件没有出现在在线控制台中。
解决方案:不要在本地启动存储模拟器。
即,当您只想调试功能时:
firebase emulators:start --inspect-functions --only functions
if (req.rawBody) {
busboy.end(req.rawBody);
}
else {
req.pipe(busboy);
}
如本期所述:https://github.com/GoogleCloudPlatform/cloud-functions-emulator/issues/161#issuecomment-376563784