pub/sub trigger by Cloud Scheduler - cloud function - firebase emulator for pub/sub

The problem:

sending notifications to the owner of the expired listing

The solution:

• target pub/sub - publish messages with Cloud scheduler on 11 pm daily
• create topic/subscription - "cron-topic" / "sub_push_cron"
  delivery type: push (pull )
  setup endpoint on backend NodeJS use NGROK to make the local NODE server available for Google Pub/Sub
  https://3274d032fcc7.ngrok.io/copper?token=YOUR_TOKEN_00hfMQOXpD
• axios Graphql API: processExpiredListins (getExpiredListins => owners => sendNotificaton)

The Benefit:

1. why no cloud function needed? 
   https://cloud.google.com/scheduler/docs/tut-pub-sub
   
   

Firebase Emulator

firebase emulators:start

need start emulator in order to make NGROK works for local server, also need create topic/subscription in local

mutation {

createPubSubTopic(topicName: "copper")

}

mutation {

createPubSubPushSubscription(topicName: "copper", subscriptionName: "sub_push_copper")

}

scheduled

 https://firebase.google.com/docs/functions/schedule-functions

cloud Firestore trigger

https://firebase.google.com/docs/functions/firestore-events

to install pubsub emulator:

https://cloud.google.com/pubsub/docs/emulator

1. install google cloud sdk
https://cloud.google.com/sdk/docs/quickstart

2. gcloud components install pubsub-emulator

/Users/junwang/Downloads/google-cloud-sdk/bin/gcloud components install pubsub-emulator

3.  start emlator

/Users/junwang/Downloads/google-cloud-sdk/bin/gcloud beta emulators pubsub start

firebase emulators:start 

https://itnext.io/firebase-emulator-suite-6b51446ca2e7

firebase int

firebase emulator:start

schedule google cloud function:

https://cloud.google.com/scheduler/docs/tut-pub-sub