firebase - 从 Google Cloud 函数上传到 Firebase 存储

Question

我正在尝试创建一个 Firebase 函数，该函数允许我传入一组图像 URL 以创建蒙太奇，将文件上传到 Firebase 存储，然后返回生成的下载 URL。这将从我的应用程序中调用，所以我使用functions.https.onCall.

const functions = require("firebase-functions");
const admin = require('firebase-admin');
var gm = require('gm').subClass({imageMagick: true});
admin.initializeApp();


exports.createMontage = functions.https.onCall((data, context) => {
var storageRef = admin.storage().bucket( 'gs://xyz-zyx.appspot.com' );
var createdMontage = storageRef.file('createdMontage.jpg');
function generateMontage(list){
  let g = gm()
   list.forEach(function(p){
       g.montage(p);
   })
   g.geometry('+81+81')
   g.density(5000,5000)
   .write(createdMontage, function(err) {
       if(!err) console.log("Written montage image.");
   });
   return true
}

generateMontage(data)

return createdMontage.getDownloadURL();

});

该函数generateMontage()在 NodeJs 上本地工作（具有本地写入目标）。

谢谢你。

标签： firebasegoogle-cloud-functionsgoogle-cloud-storagefirebase-storage

Answer 1

看看文档中的这个例子：

https://cloud.google.com/storage/docs/uploading-objects#storage-upload-object-code-sample

2021-01-11 更新

这是一个工作示例。我正在使用常规的云函数，它的限制在于srcObject,dstObject和bucketName是常量，但是它确实创建了蒙太奇，这是您的目标。

PROJECT=[[YOUR-PROJECT]]
BILLING=[[YOUR-BILLING]]
REGION=[[YOUR-REGION]]

FUNCTION=[[YOUR-FUNCTION]]

BUCKET=[[YOUR-BUCKET]]
OBJECT=[[YOUR-OBJECT]] # Path from ${BUCKET} root

gcloud projects create ${PROJECT}

gcloud beta billing projects link ${PROJECT} \
--billing-account=${BILLING}

gcloud services enable cloudfunctions.googleapis.com \
--project=${PROJECT}

gcloud services enable cloudbuild.googleapis.com \
--project=${PROJECT}

gcloud functions deploy ${FUNCTION} \
--memory=4gib \
--max-instances=1
--allow-unauthenticated \
--entry-point=montager \
--set-env-vars=BUCKET=${BUCKET},OBJECT=${OBJECT} \
--runtime=nodejs12 \
--trigger-http \
--project=${PROJECT} \
--region=${REGION}

ENDPOINT=$(\
  gcloud functions describe ${FUNCTION} \
  --project=${PROJECT} \
  --region=${REGION} \
  --format="value(httpsTrigger.url)")

curl \
--request GET \
${ENDPOINT}


`package.json`:
```JSON
{
  "name": "montage",
  "version": "0.0.1",
  "dependencies": {
    "@google-cloud/storage": "5.7.1",
    "gm": "^1.23.1"
  }
}

并且index.js：

const { Storage } = require('@google-cloud/storage');
const storage = new Storage();

const gm = require('gm').subClass({ imageMagick: true });

const bucketName = process.env["BUCKET"];
const srcObject = process.env["OBJECT"];
const dstObject = "montage.png";

// Creates 2x2 montage
const list = [
  `/tmp/${srcObject}`,
  `/tmp/${srcObject}`,
  `/tmp/${srcObject}`,
  `/tmp/${srcObject}`
];

const montager = async (req, res) => {
  // Download GCS `srcObject` to `/tmp`
  const f = await storage
    .bucket(bucketName)
    .file(srcObject)
    .download({
      destination: `/tmp/${srcObject}`
    });

  // Creating GCS write stream for montage
  const obj = await storage
    .bucket(bucketName)
    .file(dstObject)
    .createWriteStream();

  let g = gm();
  list.forEach(f => {
    g.montage(f);
  });

  console.log(`Returning`);
  g
    .geometry('+81+81')
    .density(5000, 5000)
    .stream()
    .pipe(obj)
    .on(`finish`, () => {
      console.log(`finish`);
      res.status(200).send(`ok`);
    })
    .on(`error`, (err) => {
      console.log(`error: ${err}`);
      res.status(500).send(`uhoh!`);
    });
}
exports.montager = montager;