Listening to documents in a timed Firebase function-CodePudding

I've created a node.js function that finds documents in my firestore database, and it works successfully, but I'm querying it with .get()

Is there any way I can trigger a function that will await to complete until a document is found (as the documents are uploaded by a different app) and set on a timer, so that if the timer runs out and no documents are found (say 5 minutes) it will return a null document value?

My current function looks like this right now:

export const createFinder = async (latitude, longitude, orderUid) => {

    // Find cities within 5km of location
    
    const radiusInM = 50 * 100;

    const bounds = geofire.geohashQueryBounds([latitude, longitude], radiusInM);
    const promises = [];
    
    for (const b of bounds) {
    const q = db.collection('availableDocuments')
        .orderBy('geohash')
        .startAt(b[0])
        .endAt(b[1]);

        const snapshot = await q.get();
        promises.push(snapshot);
    }

    return promises;

}

CodePudding user response：

It seems your are looking for Firestore triggered Cloud Functions. You can use onCreate() that'll trigger a function every time a document is added.

exports.fnName = functions.firestore
  .document('col/{docId}')
  .onCreate((snap, context) => {
    console.log(snap.data())
  });

I don't see a Cloud Function in your question. Are you running this logic somewhere else? You can use a Firestore listener then as shown below:

const q = "..." // your query

q.onSnapshot((qSnap) => {
  snapshot.docChanges().forEach((change) => {
    if (change.type === "added") {
      console.log("New Doc: ", change.doc.data());
      // Run function 
    }
  });
})