I did Google around and tried some code but didn't work, since every time I deploy cloud functions to firebase, it takes about 30 secs - 1 min, I think it's a complete waste of time if I continued to try code from the internet
So, I need to write a cloud function like this:
const admin = require('firebase-admin');
module.exports = function (request, response) {
const { message } = request.body;
// Now, store `message` into firebase storage
// path is: /messages/new_message, where `new_message`
// is NOT a folder, but the file that contains `message`
}
I do have a solution, but obviously, it's not a wise choice, I mean, I can always install firebase package, then call initializeApp(...), then firebase.storage().ref().... Is there another way to do this? Could you please write a little code to elaborate it?
You'll want to use the #google-cloud/storage module.
// Creates a GCS client,
const storage = new Storage();
module.exports = function (req, res) {
const { message } = req.body;
const bucket = storage .bucket('projectid.appspot.com');
const file = bucket.file('myFolder/myFilename');
// gcloud supports upload(file) not upload(bytes), so we need to stream.
const uploadStream = file.createWriteStream();
.on('error', (err) => {
res.send(err);
}).on('finish', () => {
res.send('ok');
}
uploadStream.write(data);
uploadStream.end();
}
See my parse-server GCS adapter for an example.
Related
I am having some issues connecting my firebase storage with my google action. I need to be able to "download" the json files inside in order to be able to read and pick out what a user may need given data that they provide when they call the action.
Below is the code that I currently have, complied from the different APIs and other stackoverflow questions I have found.
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const Firestore = require('#google-cloud/firestore');
const firestore = new Firestore();
var storage = require('#google-cloud/storage');
const gcs = storage({projectId: 'aur-healthcare-group'});
const bucket = gcs.bucket('gs://aur-healthcare-group');
admin.storage().bucket().file('aur-healthcare-group/aur_members.json').download(function(errr, contents){
if(!err){
var jsObjext = JSON.parse(contents.toString('utf8'));
}
});
The current error I am receiving is "code":3,"message":"Function failed on loading user code. This is likely due to a bug in the user code. Error message: Error: please examine your function logs to see the error cause. When I check the logs I only get the above mentioned message again.
I believe that I am not accessing my firebase storage correctly and have trouble finding a good resource on how to access this correctly. Would somebody be able to give me an example of how to access the storage correctly so I will be able to apply it to my project?
Since you're running in Firebase Functions, you shouldn't need to require the #google-cloud/storage dependency directly. Rather, you can get the correctly authenticated storage component via admin.storage()
Following that, you shouldn't download the file to your function, as you would be better off reading directly into memory via a readStream.
With regards to your existing code error, it may be because you're checking if (!err) when the callback variable is errr.
I've done this in the past and here's a code snippet of how I achieved it. It's written in Typescript specifically, but I think you should be able to port it to JS if you're using that directly.
import * as functions from 'firebase-functions';
import * as admin from 'firebase-admin'
import { Bucket } from '#google-cloud/storage';
admin.initializeApp()
const db = admin.firestore()
const bucket = admin.storage().bucket('project-id.appspot.com') // Use your project-id here.
const readFile = async (bucket: Bucket, fileName: string) => {
const stream = bucket.file(fileName).createReadStream();
return new Promise((resolve, reject) => {
let buffer = '';
stream.on('data', function(d: string) {
buffer += d;
}).on('end', function() {
resolve(buffer)
});
})
}
app.handle('my-intent-handler', async (conv) => {
const contents = await readArticle(bucket, 'filename.txt')
conv.add(`Your content is ${contents}`)
})
exports.fulfillment = functions.https.onRequest(app)
For some reason, when the following scheduled function runs, it only writes a rules.json file to the Cloud Storage bucket, containing some of the rules in our database.
export const generateBackupScheduledFunction = functions.pubsub.schedule('every 1 days').onRun((context) => {
return generateBackup();
});
async function generateBackup() {
const client = new firestore.v1.FirestoreAdminClient()
const projectId = "project-id"
const databaseName = `projects/${projectId}/databases/(default)`
return client.exportDocuments({
name: databaseName,
outputUriPrefix: `gs://${projectId}-backups`,
collectionIds: []
});
}
However, when I run this function from the Firebase functions shell, or Cloud Functions section in Google Cloud, it runs just fine, and creates a backup of our database.
Any idea why this might be happening?
so I make http trigger function to get all events from my firestore like the image above.
firestore.js
const functions = require('firebase-functions')
const admin = require("firebase-admin")
// initialize database
admin.initializeApp()
const db = admin.firestore();
const settings = {timestampsInSnapshots: true};
db.settings(settings)
const eventRef = db.collection('event')
module.getAllEventsFromFirestore = functions.https.onRequest(async (request,response) => {
try {
const events = await eventRef.get()
response.status(200).send(`number of event is ${event.size}`)
} catch (error) {
response.status(500).send(error)
}
})
and my index.js
const {getAllEventsFromFirestore} = require("./firestore")
after deploying the function, I expect will get the URL to access that http trigger function on my terminal, but I can't find it.
The Firebase CLI will only give you a URL the first time you deploy the function. If you update the function after the first deploy, it won't print the URL. You can get the URL of the function by going to the Firebase console and view your functions there. The URL will be available on the Functions dashboard page.
If you would like to see a change in behavior of the Firebase CLI, file a feature request with Firebase support.
I couldn't find a solution for this use case in Firebase official guides.
They are HTTPS callable functions
Want to run Functions locally using Cloud Functions shell to test
Functions save received data to Firestore
The 'auth' context information is also needed
My code as below. Thanks in advance.
Function :
exports.myFunction = functions.https.onCall((data, context) => {
const id = context.auth.uid;
const message = data.message;
admin.firestore()...
// Do something with Firestore //
});
Client call :
const message = { message: 'Hello.' };
firebase.functions().httpsCallable('myFunction')(message)
.then(result => {
// Do something //
})
.catch(error => {
// Error handler //
});
There is an api exactly for this use case, see here.
I used it in javascript(Client side) as follows -
button.addEventListener('click',()=>{
//use locally deployed function
firebase.functions().useFunctionsEmulator('http://localhost:5001');
//get function reference
const sayHello = firebase.functions().httpsCallable('sayHello');
sayHello().then(result=>{
console.log(result.data);
})
})
where sayHello() is the callable firebase function.
When the client is an android emulator/device. Use 10.0.2.2 in place of localhost.
Also the code for flutter would be like so -
CloudFunctions.instance.useFunctionsEmulator(origin: 'http://10.0.2.2:5000')
.getHttpsCallable(functionName: 'sayHello')
Cloud functions have emulators for that. Check this link it can suite your case. Its not functions shell, but for testing purposes i think it can still works for you
In newer versions of firebase, this is the way:
import firebaseApp from './firebaseConfig';
import { getFunctions, httpsCallable, connectFunctionsEmulator } from 'firebase/functions';
const functions = getFunctions(firebaseApp);
export async function post(funcName, params) {
connectFunctionsEmulator(functions, 'localhost', '5001'); // DEBUG
let func = httpsCallable(functions, funcName);
let result = await func(params);
return result.data;
}
I'm storing references to files in Firebase Cloud Storage using URLs. In firebase client code, you can call firebase.storage().refFromURL(photo.image) to get the actual storage reference and do handy things like call delete with it. How do I accomplish the same thing in a cloud function (specifically a realtime database trigger)? I want to be able to clean up images after deleting the object that references them.
Following Bob Snider's answer, this is a little function (typescript) to extract file full path from URL.
export const getFileFromURL = (fileURL: string): Promise<any> => {
const fSlashes = fileURL.split('/');
const fQuery = fSlashes[fSlashes.length - 1].split('?');
const segments = fQuery[0].split('%2F');
const fileName = segments.join('/');
return fileName;
}
In a cloud function, to delete a file from storage you need the file's bucket name and file name (which includes the path). Those can be obtained on the client side from the storage reference. For example, a JS Storage Reference has properties bucket and fullPath. The string representation of a storage reference has format: gs://example-12345.appspot.com/path/to/file, where the bucket is example-12345.appspot.com and the file "name" is path/to/file.
In the example cloud function shown below, the client is expected to provide the bucket and filename as children of the trigger location. You could also write the URL string to the trigger location and then split it into bucket and filename components in the cloud function.
This code is based on the example in the Cloud Storage guide.
const functions = require('firebase-functions');
const gcs = require('#google-cloud/storage')();
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
exports.deleteFile = functions.database.ref('/test').onWrite(event => {
const bucket = event.data.child('bucket').val();
const filename = event.data.child('filename').val();
console.log('bucket=', bucket, 'filename=', filename);
return gcs.bucket(bucket).file(filename).delete().then(() => {
console.log(`gs://${bucket}/${filename} deleted.`);
}).catch((err) => {
console.error('ERROR:', err);
});
});
Here is a one-liner.
const refFromURL = (URL) => decodeURIComponent(URL.split('/').pop().split('?')[0])
I've wrote code sample which I using instead refFromURL method from web-firebase in my functions project based on Bob Snyder answer.
function refFromUrl(gsLink) {
var fileEntryTemp = gsLink.file.replace("gs://", "")
var bucketName = fileEntryTemp.substring(0, fileEntryTemp.indexOf("/"));
var filename = gsLink.file.match("gs://" + bucketName + "/" + "(.*)")[1];
var gsReference = admin.storage().bucket().file(filename);
return gsReference;
}
Here is an example how I get a download link based on this ref:
var gsReference = refFromUrl(fileEntry);
gsReference.getSignedUrl({
action: 'read',
expires: '03-09-2491'
}).then(function (url) {
console.log(url);
response.send(url);
}).catch(function (error) {
});
Hope this will save time for somebody
For complicated actions on your database from cloud functions you could use Admin SDK https://firebase.google.com/docs/database/admin/startFor the usage of Cloud Storage in Cloud Function check this out https://firebase.google.com/docs/functions/gcp-storage-eventsCloud Functions may not provide the same capability as client since Cloud Functions is beta for now and people are still working on it.