optimize firebase reads

README.md

@@ -1 +1,19 @@
 # wgenerator
+
+## Admin migration
+
+If `songUsage` needs to be rebuilt from all existing shows, log in with a user that has the `admin` role and run this in the browser console:
+
+```js
+await window.wgeneratorAdmin.rebuildSongUsage()
+```
+
+The migration:
+
+- resets `songUsage` for all users
+- scans all shows and all `shows/{id}/songs` entries
+- rebuilds the per-user counters based on show ownership
+
+It returns a summary object with processed user, show and show-song counts.
+
+This is intended as a manual one-off migration and is read-heavy by design.

src/app/modules/guest/guest-show-data.service.ts

@@ -1,6 +1,6 @@
 import {Injectable} from '@angular/core';
 import {Observable} from 'rxjs';
-import {map, shareReplay} from 'rxjs/operators';
+import {shareReplay} from 'rxjs/operators';
 import {DbService} from 'src/app/services/db.service';
 import {GuestShow} from './guest-show';
 
@@ -18,7 +18,7 @@ export class GuestShowDataService {
 
   public constructor(private dbService: DbService) {}
 
-  public read$: (id: string) => Observable<GuestShow | null> = (id: string): Observable<GuestShow | null> => this.list$.pipe(map(_ => _.find(s => s.id === id) || null));
+  public read$: (id: string) => Observable<GuestShow | null> = (id: string): Observable<GuestShow | null> => this.dbService.doc$(`${this.collection}/${id}`);
   public update$: (id: string, data: Partial<GuestShow>) => Promise<void> = async (id: string, data: Partial<GuestShow>): Promise<void> =>
     await this.dbService.doc(this.collection + '/' + id).update(data);
   public add: (data: Partial<GuestShow>) => Promise<string> = async (data: Partial<GuestShow>): Promise<string> => (await this.dbService.col(this.collection).add(data)).id;

src/app/modules/shows/services/show-data.service.ts

@@ -22,10 +22,8 @@ export class ShowDataService {
 
   public listRaw$ = () => this.dbService.col$<Show>(this.collection);
 
-  public read$ = (showId: string): Observable<Show | null> => this.list$.pipe(map(_ => _.find(s => s.id === showId) || null));
+  public read$ = (showId: string): Observable<Show | null> => this.dbService.doc$(`${this.collection}/${showId}`);
 
-  // public list$ = (): Observable<Show[]> => this.dbService.col$(this.collection);
-  // public read$ = (showId: string): Observable<Show | null> => this.dbService.doc$(`${this.collection}/${showId}`);
   public update = async (showId: string, data: Partial<Show>): Promise<void> => await this.dbService.doc(`${this.collection}/${showId}`).update(data);
   public add = async (data: Partial<Show>): Promise<string> => (await this.dbService.col(this.collection).add(data)).id;
 }

src/app/modules/songs/services/song-data.service.ts

@@ -2,7 +2,7 @@ import {Injectable} from '@angular/core';
 import {Song} from './song';
 import {Observable} from 'rxjs';
 import {DbService} from '../../../services/db.service';
-import {map, shareReplay, startWith} from 'rxjs/operators';
+import {shareReplay, startWith} from 'rxjs/operators';
 
 @Injectable({
   providedIn: 'root',
@@ -22,10 +22,7 @@ export class SongDataService {
     // this.list$.subscribe();
   }
 
-  // public list$ = (): Observable<Song[]> => this.dbService.col$(this.collection);
-
-  //public read$ = (songId: string): Observable<Song | null> => this.dbService.doc$(this.collection + '/' + songId);
-  public read$ = (songId: string): Observable<Song | null> => this.list$.pipe(map(_ => _.find(s => s.id === songId) || null));
+  public read$ = (songId: string): Observable<Song | null> => this.dbService.doc$(this.collection + '/' + songId);
   public update$ = async (songId: string, data: Partial<Song>): Promise<void> => await this.dbService.doc(this.collection + '/' + songId).update(data);
   public add = async (data: Partial<Song>): Promise<string> => (await this.dbService.col(this.collection).add(data)).id;
   public delete = async (songId: string): Promise<void> => await this.dbService.doc(this.collection + '/' + songId).delete();

src/app/modules/songs/song/song.component.html

@@ -28,8 +28,7 @@
           <div *ngIf="song.artist">Künstler: {{ song.artist }}</div>
           <div *ngIf="song.label">Verlag: {{ song.label }}</div>
           <div *ngIf="song.origin">Quelle: {{ song.origin }}</div>
-          <div *ngIf="song.origin">Quelle: {{ song.origin }}</div>
-          <div *ngIf="songCount$()|async as count">Wie oft verwendet: {{ count }}</div>
+          <div>Wie oft verwendet: {{ songCount$ | async }}</div>
         </div>
       </div>
 

src/app/modules/songs/song/song.component.ts

@@ -56,6 +56,7 @@ export class SongComponent implements OnInit {
   public song$: Observable<Song | null> | null = null;
   public files$: Observable<File[] | null> | null = null;
   public user$: Observable<User | null> | null = null;
+  public songCount$: Observable<number> | null = null;
   public faEdit = faEdit;
   public faDelete = faTrash;
   public faFileCirclePlus = faFileCirclePlus;
@@ -85,6 +86,17 @@ export class SongComponent implements OnInit {
       map(param => param.songId),
       switchMap(songId => this.fileService.read$(songId))
     );
+
+    this.songCount$ = combineLatest([this.user$, this.song$]).pipe(
+      map(([user, song]) => {
+        if (!song) {
+          return 0;
+        }
+
+        return user?.songUsage?.[song.id] ?? 0;
+      }),
+      distinctUntilChanged()
+    );
   }
 
   public getFlags = (flags: string): string[] => {
@@ -105,12 +117,4 @@ export class SongComponent implements OnInit {
     await this.showService.update$(show?.id, {order: [...show.order, newId ?? '']});
     await this.router.navigateByUrl('/shows/' + show.id);
   }
-
-  public songCount$ = () =>
-    combineLatest([this.user$, this.song$]).pipe(
-      map(([user, song]) => {
-        return user.songUsage[song.id];
-      }),
-      distinctUntilChanged()
-    );
 }

src/app/services/config.service.ts

@@ -2,13 +2,21 @@ import {Injectable} from '@angular/core';
 import {DbService} from './db.service';
 import {firstValueFrom, Observable} from 'rxjs';
 import {Config} from './config';
+import {shareReplay} from 'rxjs/operators';
 
 @Injectable({
   providedIn: 'root',
 })
 export class ConfigService {
+  private readonly config$ = this.db.doc$<Config>('global/config').pipe(
+    shareReplay({
+      bufferSize: 1,
+      refCount: true,
+    })
+  );
+
   public constructor(private db: DbService) {}
 
-  public get$ = (): Observable<Config | null> => this.db.doc$<Config>('global/config');
+  public get$ = (): Observable<Config | null> => this.config$;
   public get = (): Promise<Config | null> => firstValueFrom(this.get$());
 }

src/app/services/global-settings.service.ts

@@ -8,15 +8,17 @@ import {shareReplay} from 'rxjs/operators';
   providedIn: 'root',
 })
 export class GlobalSettingsService {
+  private readonly settings$ = this.db.doc$<GlobalSettings>('global/static').pipe(
+    shareReplay({
+      bufferSize: 1,
+      refCount: true,
+    })
+  );
+
   public constructor(private db: DbService) {}
 
   public get get$(): Observable<GlobalSettings | null> {
-    return this.db.doc$<GlobalSettings>('global/static').pipe(
-      shareReplay({
-        bufferSize: 1,
-        refCount: true,
-      })
-    );
+    return this.settings$;
   }
 
   public async set(data: Partial<GlobalSettings>): Promise<void> {

src/app/services/user/user.service.ts

@@ -1,13 +1,20 @@
 import {Injectable} from '@angular/core';
 import {AngularFireAuth} from '@angular/fire/compat/auth';
 import {BehaviorSubject, firstValueFrom, Observable} from 'rxjs';
-import {filter, map, shareReplay, switchMap, tap} from 'rxjs/operators';
+import {filter, map, shareReplay, switchMap, take, tap} from 'rxjs/operators';
 import {User} from './user';
 import {DbService} from '../db.service';
 import {environment} from '../../../environments/environment';
 import {Router} from '@angular/router';
 import {ShowDataService} from '../../modules/shows/services/show-data.service';
 import {ShowSongDataService} from '../../modules/shows/services/show-song-data.service';
+import firebase from 'firebase/compat/app';
+
+export interface SongUsageMigrationResult {
+  usersProcessed: number;
+  showsProcessed: number;
+  showSongsProcessed: number;
+}
 
 @Injectable({
   providedIn: 'root',
@@ -51,6 +58,7 @@ export class UserService {
     const aUser = await this.afAuth.signInWithEmailAndPassword(user, password);
     if (!aUser.user) return null;
     const dUser = await this.readUser(aUser.user.uid);
+    if (!dUser) return null;
     await this.initSongUsage(dUser);
     this.iUser$.next(dUser);
     this.iUserId$.next(aUser.user.uid);
@@ -81,8 +89,9 @@ export class UserService {
     const aUser = await this.afAuth.createUserWithEmailAndPassword(user, password);
     if (!aUser.user) return;
     const userId = aUser.user.uid;
-    await this.db.doc('users/' + userId).set({name, chordMode: 'onlyFirst'});
+    await this.db.doc('users/' + userId).set({name, chordMode: 'onlyFirst', songUsage: {}});
     const dUser = await this.readUser(aUser.user.uid);
+    if (!dUser) return;
     this.iUser$.next(dUser);
     await this.router.navigateByUrl('/brand/new-user');
   }
@@ -90,35 +99,71 @@ export class UserService {
   public incSongCount = (songId: string) => this.updateSongUsage(songId, 1);
   public decSongCount = (songId: string) => this.updateSongUsage(songId, -1);
 
+  public async rebuildSongUsage(): Promise<SongUsageMigrationResult> {
+    const currentUser = await firstValueFrom(this.iUser$.pipe(take(1)));
+    if (!currentUser || !this.hasAdminRole(currentUser.role)) {
+      throw new Error('Admin role required to rebuild songUsage.');
+    }
+
+    const [users, shows] = await Promise.all([firstValueFrom(this.users$), firstValueFrom(this.showDataService.listRaw$())]);
+    const songUsageByUserId: Record<string, Record<string, number>> = {};
+
+    users.forEach(user => {
+      songUsageByUserId[user.id] = {};
+    });
+
+    let showSongsProcessed = 0;
+    for (const show of shows) {
+      const ownerId = show.owner;
+      if (!ownerId) {
+        continue;
+      }
+
+      const showSongs = await firstValueFrom(this.showSongDataService.list$(show.id));
+      const usage = songUsageByUserId[ownerId] ?? {};
+      songUsageByUserId[ownerId] = usage;
+
+      for (const showSong of showSongs) {
+        showSongsProcessed += 1;
+        usage[showSong.songId] = (usage[showSong.songId] ?? 0) + 1;
+      }
+    }
+
+    await Promise.all(
+      users.map(user =>
+        this.update$(user.id, {
+          songUsage: songUsageByUserId[user.id] ?? {},
+        })
+      )
+    );
+
+    return {
+      usersProcessed: users.length,
+      showsProcessed: shows.length,
+      showSongsProcessed,
+    };
+  }
+
   private async updateSongUsage(songId: string, direction: number) {
     const user = await firstValueFrom(this.user$);
     if (!user) return null;
 
-    const songUsage = user?.songUsage ?? {};
-    let currentSongCount = songUsage[songId];
-    if (currentSongCount === null || currentSongCount === undefined) currentSongCount = 0;
-    else currentSongCount = currentSongCount + direction;
-    songUsage[songId] = Math.max(0, currentSongCount);
-
-    await this.update$(user.id, {songUsage});
+    await this.db.doc<User>('users/' + user.id).update({
+      [`songUsage.${songId}`]: firebase.firestore.FieldValue.increment(direction),
+    });
   }
 
   private async initSongUsage(user: User) {
     if (user.songUsage) return;
+    await this.update$(user.id, {songUsage: {}});
+  }
 
-    const shows = await firstValueFrom(this.showDataService.listRaw$());
-    const myShows = shows.filter(show => show.owner === user.id);
-    const songUsage: {[songId: string]: number} = {};
-    for (const show of myShows) {
-      const showSongs = await firstValueFrom(this.showSongDataService.list$(show.id));
-      for (const showSong of showSongs) {
-        const current = songUsage[showSong.songId] ?? 0;
-        songUsage[showSong.songId] = current + 1;
-      }
+  private hasAdminRole(role: string | null | undefined): boolean {
+    if (!role) {
+      return false;
     }
 
-    await this.update$(user.id, {songUsage});
-    return;
+    return role.split(';').includes('admin');
   }
 
   private readUser$ = (uid: string) => this.db.doc$<User>('users/' + uid);

src/main.ts

@@ -16,6 +16,15 @@ import {FontAwesomeModule} from '@fortawesome/angular-fontawesome';
 import {AppComponent} from './app/app.component';
 import {provideFirebaseApp, initializeApp} from '@angular/fire/app';
 import {provideFirestore, getFirestore} from '@angular/fire/firestore';
+import {UserService} from './app/services/user/user.service';
+
+declare global {
+  interface Window {
+    wgeneratorAdmin?: {
+      rebuildSongUsage(): Promise<unknown>;
+    };
+  }
+}
 
 if (environment.production) {
   enableProdMode();
@@ -42,4 +51,11 @@ bootstrapApplication(AppComponent, {
     {provide: MAT_DATE_LOCALE, useValue: 'de-DE'},
     provideAnimations(),
   ],
-}).catch(err => console.error(err));
+})
+  .then(appRef => {
+    const userService = appRef.injector.get(UserService);
+    window.wgeneratorAdmin = {
+      rebuildSongUsage: () => userService.rebuildSongUsage(),
+    };
+  })
+  .catch(err => console.error(err));