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Modified the cloud function to only act when there has been a change on priority or event on tasks

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This commit is contained in:
Mariano Uvalle 2019-04-13 19:36:52 -05:00
parent 7f77d8a86a
commit 74c40c535b
1 changed files with 39 additions and 11 deletions
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50
functions/src/pending_tasks_updater.ts
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@ -1,7 +1,9 @@
import * as functions from 'firebase-functions';
import * as admin from 'firebase-admin';
import { DocumentSnapshot } from 'firebase-functions/lib/providers/firestore';
import { DocumentReference } from '@google-cloud/firestore';
type DocumentReference = admin.firestore.DocumentReference;
type FieldValue = admin.firestore.FieldValue;
admin.initializeApp();
@ -10,21 +12,27 @@ const incrementValue = admin.firestore.FieldValue.increment(1);
const decrementValue = admin.firestore.FieldValue.increment(-1);
const db = admin.firestore();
let getUserReference = async (taskSnapShot: DocumentSnapshot) => {
/// Gets the user [DocumentReference] for the current task.
const getUserReference = async (taskSnapShot: DocumentSnapshot) => {
const querySnapshot = await db.collection('users').where('username', '==', taskSnapShot.get('ownerUsername')).get()
return querySnapshot.docs[0].ref;
}
let getEventReference = async (taskSnapshot: DocumentSnapshot, userReference: DocumentReference) => {
/// Gets an event document reference for the current task.
const getEventReference = async (
taskSnapshot: DocumentSnapshot,
userReference: DocumentReference
) => {
const querySnapshot = await userReference.collection('events').where('name', '==', taskSnapshot.get('event')).get();
return querySnapshot.docs[0].ref;
}
let incrementFromPriority = (
/// Increments the necessary fields in the event and user documents linked to this task.
const incrementFromPriority = async (
priority: number,
eventReference: DocumentReference,
userReference: DocumentReference,
value: FirebaseFirestore.FieldValue,
value: FieldValue,
) => {
let userFieldName: string = '';
let eventFieldName: string = '';
@ -44,8 +52,16 @@ let incrementFromPriority = (
break;
}
eventReference.update({ [eventFieldName]: value });
userReference.update({ [userFieldName]: value });
await eventReference.update({ [eventFieldName]: value });
await userReference.update({ [userFieldName]: value });
}
/// Incrementsj only the 'pendingTasks' field for the provided event.
const incrementPendingTasks = async (
eventReference: DocumentReference,
value: FieldValue
) => {
await eventReference.update({ 'pendingTasks': value });
}
export const pendingTasksUpdater: functions.CloudFunction<functions.Change<FirebaseFirestore.DocumentSnapshot>> = functions.firestore
@ -59,6 +75,10 @@ export const pendingTasksUpdater: functions.CloudFunction<functions.Change<Fireb
let eventDocumentBefore: DocumentReference | null;
if (change.after.exists && change.before.exists) {
if (before.get('priority') === after.get('priority') || before.get('event') === after.get('event')) {
console.log('Nothing to update, exiting function');
return true;
}
userDocument = await getUserReference(after);
eventDocumentBefore = await getEventReference(before, userDocument);
eventDocument = await getEventReference(after, userDocument);
@ -75,14 +95,22 @@ export const pendingTasksUpdater: functions.CloudFunction<functions.Change<Fireb
switch (action) {
case 'create':
incrementFromPriority(after.get('priority'), eventDocument, userDocument, incrementValue);
await incrementFromPriority(after.get('priority'), eventDocument, userDocument, incrementValue);
await incrementPendingTasks(eventDocument, incrementValue);
break;
case 'delete':
incrementFromPriority(before.get('priority'), eventDocument, userDocument, decrementValue);
await incrementFromPriority(before.get('priority'), eventDocument, userDocument, decrementValue);
await incrementPendingTasks(eventDocument, decrementValue);
break;
case 'update':
incrementFromPriority(before.get('priority'), eventDocumentBefore!, userDocument, decrementValue);
incrementFromPriority(after.get('priority'), eventDocument, userDocument, incrementValue);
if (before.get('priority') !== after.get('priority')) {
await incrementFromPriority(before.get('priority'), eventDocumentBefore!, userDocument, decrementValue);
await incrementFromPriority(after.get('priority'), eventDocument, userDocument, incrementValue);
}
if (before.get('event') !== after.get('event')) {
await incrementPendingTasks(eventDocumentBefore!, decrementValue);
await incrementPendingTasks(eventDocument, incrementValue);
}
break;
}