I am trying to schedule a function to run based on DateTime object field in my Firestore database.
Example, I have a collection of events in the Database and each event has a DateTime field (Start time) for the start of the event. The event also has a list of users that are subscribed to the event.
Is there a way to use Cloud Functions to notify the subscribed users that the event is about to start at the start time of the event or 5 or 10 mins before the event starts?
I am currently using Cloud Functions for notification and its working fine but that is based writes to specific portions of the database, not time event.
Thank you in advance.
The only way to do this with a scheduled Cloud Function for this sort of work is to schedule it run periodically (every 1 minute is the most often), and query for documents that meet the criteria for when you want to send the notification at the moment that the function is currently running. This means you should be looking for documents where the time is in the 5-10 minute near future from the current time.
You can't use scheduled Cloud Functions to delay some work to happen later. But you can integrate with Cloud Tasks for that.
Related
I am building an appointment booking app, I'm using FCM to handle push notifications,
so I am wondering if there is a way to schedule push notifications
For example;
When the doctor gives an appointment time, the patient should be notified few minutes to the appointment time.
I've read about cron job but I'm not sure on how to schedule it to a dynamic time.
You can either run a scheduled task at a fixed interval (say every minute) and then send all messages for the past/next minute, or you can use Cloud Tasks to schedule the task (which is then a HTTP Cloud Function) either yourself (as Doug explained here) oras shown in this documentation.
This topic has been covered quite a few times before, so I recommend also checking out:
How to create cron jobs dynamically in firebase
How to trigger cloud function based on date stored in cloud firestore?
How to trigger a cloud function based on a timestamp attribute of a firestore document
run some code 1 hour after a document is updated with cloud function and firestore
I have an app, where I have an admin and a customer.
Admins can invite users that are in a line.
Admins can configure maximum waiting time for which a customer should show up after he gets invited.
If he does not show up in specified period of time I need to update the database to set the status of a customer's ticket to "no-appearance" and send notification to a customer.
How can I do that using firebase cloud functions?
It looks like I cannot setTimeout because functions are limited to 540 seconds and it is not applicable in my case.
Looks like Pub-sub functions can only be created with a specific period which you have to determine statically
You can use Google Cloud Task to send a scheduled job to trigger cloud functions. Here an article about that: https://medium.com/swlh/event-driven-scheduled-jobs-using-gcp-cloud-tasks-e712c760ab95
The difference of a Pub/Sub is that you can send a task with a dynamic schedule and that task runs only once.
Actually what I am working on a to-do task manager app. Currently I am adding tasks to cloud Firestore after as a new document. I want to send notification to user at the time user scheduled to do that work. I am so confused. It can be lots of tasks from a single user. And the the notification tone has to be selected by user itself.
Please help me in this..
Thanks you!
So you'll need:
A database where you keep the notification payload, user FCM token, and the time they are to be sent.
A schedule Cloud Function that runs every day or every hour based on the granularity of the task.
Now, when the Cloud Function gets triggered, it:
Runs a query against the database for notifications that are scheduled to be sent before the current time
Loops over the results send each notification in turn.
You can now delete the database entry if you want to.
Furthermore, if you want to reduce the number of cloud function triggers, you have a combination of the FCM and an alarm manager to show a notification after a delay (feasible in flutter through local notifications too). this way you can send the payload at a particular time of the day and deploy it at any time locally.
Not sure how optimized this is, looking for better ways!
I'm developing an app using React Native and Firebase Realtime database. I want to do something like this.
From the app, I set a time duration and press a button. Then, it writes data to the Firebase. Assume that I set the time duration to 1000000000 ms and press the button. Then, the database looks like this:
schedules
|
|--schedule1
|
|--status: "Running"
|--durationInMS: 1000000000
I want to run a background function that changes the above status to "TimeOver" after 1000000000 ms. This function should be run in the background even if the app is closed:
schedules
|
|--schedule1
|
|--status: "TimeOver"
|--durationInMS: 1000000000
How to do this?
There is no built-in trigger to run after a certain delay that is written in the database.
But you can either build your own scheduler using Cloud Scheduler, or create a regularly running scheduled function that then checks for expired schedules in your database.
Also see:
Cloud Functions for Firebase trigger on time?
How to create cron jobs in firebase programmatically
Executing cloud functions after n seconds on demand
Firebase Functions, run after 15 minutes of user inactivity
How can we get Firestore to trigger an event when a document's Date/Time field matches current time?
Scheduled Cloud Functions Firebase
the blog post How to schedule a Cloud Function to run in the future with Cloud Tasks (to build a Firestore document TTL)
the article Dynamic Scheduled Background Jobs in Firebase
I am running a cronjob every evening to send notifications to a set of users in my database, call them 1-100. However, recently with an increase in my users, it's taking longer and longer for this job to run. Is there a way to have the pub/sub topic trigger multiple jobs, say triggering one job to handle users 1-50, and another to handle users 51-100?
Sure, just partition your users according to some bucketing scheme (maybe modulo their UID), create more pubsub topics and functions for those partitions, and send messages to those topics for each of the the partitions of users that you want to process. So, in your main scheduled function, just send messages to each pubsub topic partition, and let the delegate functions do their work.
Also, if your haven't already, consider increasing the timeout for the main function in case it just needs more time to finish processes. The max timeout for a Cloud Functions background trigger is 9 minutes.