fix(contribute command): listen to user doc changes instead of fetchi…

…ng doc to check if exists

There can be some lag after running the auth command before the user can be found in firebase. In
which case trying to fetch the user will fail with `FirebaseError: Unable to retrieve the
authenticated user.`. Instead we can listen and wait for user doc changes.

privacy-scaling-explorations#220

packages/actions/src/helpers/database.ts

@@ -6,6 +6,7 @@ import {
     Firestore,
     getDoc,
     getDocs,
+    onSnapshot,
     query,
     QueryConstraint,
     QueryDocumentSnapshot,
@@ -123,6 +124,26 @@ export const getDocumentById = async (
     return getDoc(docRef)
 }
 
+export const waitForUserDocumentToExist = (firestoreDatabase: Firestore, collection: string, documentId: string) => {
+    return new Promise<void>((resolve, reject) => {
+        const docRef = doc(firestoreDatabase, collection, documentId)
+
+        const unsubscribe = onSnapshot(
+            docRef,
+            (docSnapshot) => {
+                if (docSnapshot.exists()) {
+                    unsubscribe()
+                    resolve()
+                }
+            },
+            (error) => {
+                unsubscribe()
+                reject(error)
+            }
+        )
+    })
+}
+
 /**
  * Query for opened ceremonies.
  * @param firestoreDatabase <Firestore> - the Firestore service instance associated to the current Firebase application.

packages/actions/src/index.ts

@@ -23,7 +23,8 @@ export {
     getContributionsCollectionPath,
     getTimeoutsCollectionPath,
     getOpenedCeremonies,
-    getCeremonyCircuits
+    getCeremonyCircuits,
+    waitForUserDocumentToExist
 } from "./helpers/database"
 export {
     compareCeremonyArtifacts,

packages/phase2cli/src/commands/contribute.ts

@@ -21,7 +21,8 @@ import {
     FirebaseDocumentInfo,
     generateValidContributionsAttestation,
     commonTerms,
-    convertToDoubleDigits
+    convertToDoubleDigits,
+    waitForUserDocumentToExist
 } from "@p0tion/actions"
 import { DocumentSnapshot, DocumentData, Firestore, onSnapshot, Timestamp } from "firebase/firestore"
 import { Functions } from "firebase/functions"
@@ -947,15 +948,7 @@ const contribute = async (opt: any) => {
     const spinner = customSpinner(`Verifying your participant status...`, `clock`)
     spinner.start()
 
-    // Check that the user's document is created
-    const userDoc = await getDocumentById(firestoreDatabase, commonTerms.collections.users.name, user.uid)
-    const userData = userDoc.data()
-    if (!userData) {
-        spinner.fail(
-            `Unfortunately we could not find a user document with your information. This likely means that you did not pass the GitHub reputation checks and therefore are not elegible to contribute to any ceremony. If you believe you pass the requirements, it might be possible that your profile is private and we were not able to fetch your real statistics, in this case please consider making your profile public for the duration of the contribution. Please contact the coordinator if you believe this to be an error.`
-        )
-        process.exit(0)
-    }
+    await waitForUserDocumentToExist(firestoreDatabase, commonTerms.collections.users.name, user.uid)
 
     // Check the user's current participant readiness for contribution status (eligible, already contributed, timed out).
     const canParticipantContributeToCeremony = await checkParticipantForCeremony(firebaseFunctions, selectedCeremony.id)