Merge branch 'stats-race' into 'main'

stats: fix race conditions (on Postgres)

See merge request soapbox-pub/ditto!311

src/config.ts

@@ -61,27 +61,6 @@ class Conf {
   static get externalDomain() {
     return Deno.env.get('NOSTR_EXTERNAL') || Conf.localDomain;
   }
-  /** Path to the main SQLite database which stores users, events, and more. */
-  static get dbPath() {
-    if (Deno.env.get('DATABASE_URL') === 'sqlite://:memory:') {
-      return ':memory:';
-    }
-
-    const { host, pathname } = Conf.databaseUrl;
-
-    if (!pathname) return '';
-
-    // Get relative path.
-    if (host === '') {
-      return pathname;
-    } else if (host === '.') {
-      return pathname;
-    } else if (host) {
-      return host + pathname;
-    }
-
-    return '';
-  }
   /**
    * Heroku-style database URL. This is used in production to connect to the
    * database.
@@ -92,9 +71,24 @@ class Conf {
    * protocol://username:password@host:port/database_name
    * ```
    */
-  static get databaseUrl(): url.UrlWithStringQuery {
-    return url.parse(Deno.env.get('DATABASE_URL') ?? 'sqlite://data/db.sqlite3');
+  static get databaseUrl(): string {
+    return Deno.env.get('DATABASE_URL') ?? 'sqlite://data/db.sqlite3';
   }
+  static db = {
+    get url(): url.UrlWithStringQuery {
+      return url.parse(Deno.env.get('DATABASE_URL') ?? 'sqlite://data/db.sqlite3');
+    },
+    get dialect(): 'sqlite' | 'postgres' | undefined {
+      switch (Conf.db.url.protocol) {
+        case 'sqlite:':
+          return 'sqlite';
+        case 'postgres:':
+        case 'postgresql:':
+          return 'postgres';
+      }
+      return undefined;
+    },
+  };
   /** Character limit to enforce for posts made through Mastodon API. */
   static get postCharLimit() {
     return Number(Deno.env.get('POST_CHAR_LIMIT') || 5000);

src/db/DittoDB.ts

@@ -19,16 +19,13 @@ export class DittoDB {
   }
 
   static async _getInstance(): Promise<Kysely<DittoTables>> {
-    const { databaseUrl } = Conf;
-
     let kysely: Kysely<DittoTables>;
 
-    switch (databaseUrl.protocol) {
-      case 'sqlite:':
+    switch (Conf.db.dialect) {
+      case 'sqlite':
         kysely = await DittoSQLite.getInstance();
         break;
-      case 'postgres:':
-      case 'postgresql:':
+      case 'postgres':
         kysely = await DittoPostgres.getInstance();
         break;
       default:

src/db/adapters/DittoPostgres.ts

@@ -19,7 +19,7 @@ export class DittoPostgres {
           // @ts-ignore mismatched kysely versions probably
           createDriver() {
             return new PostgreSQLDriver(
-              { connectionString: Deno.env.get('DATABASE_URL') },
+              { connectionString: Conf.databaseUrl },
               Conf.pg.poolSize,
             );
           },

src/db/adapters/DittoSQLite.ts

@@ -36,11 +36,11 @@ export class DittoSQLite {
 
   /** Get the relative or absolute path based on the `DATABASE_URL`. */
   static get path() {
-    if (Deno.env.get('DATABASE_URL') === 'sqlite://:memory:') {
+    if (Conf.databaseUrl === 'sqlite://:memory:') {
       return ':memory:';
     }
 
-    const { host, pathname } = Conf.databaseUrl;
+    const { host, pathname } = Conf.db.url;
 
     if (!pathname) return '';
 

src/db/migrations/002_events_fts.ts

@@ -3,7 +3,7 @@ import { Kysely, sql } from 'kysely';
 import { Conf } from '@/config.ts';
 
 export async function up(db: Kysely<any>): Promise<void> {
-  if (Conf.databaseUrl.protocol === 'sqlite:') {
+  if (Conf.db.dialect === 'sqlite') {
     await sql`CREATE VIRTUAL TABLE events_fts USING fts5(id, content)`.execute(db);
   }
 }

src/db/migrations/019_ndatabase_schema.ts

@@ -7,7 +7,7 @@ export async function up(db: Kysely<any>): Promise<void> {
   await db.schema.alterTable('tags').renameTo('nostr_tags').execute();
   await db.schema.alterTable('nostr_tags').renameColumn('tag', 'name').execute();
 
-  if (Conf.databaseUrl.protocol === 'sqlite:') {
+  if (Conf.db.dialect === 'sqlite') {
     await db.schema.dropTable('events_fts').execute();
     await sql`CREATE VIRTUAL TABLE nostr_fts5 USING fts5(event_id, content)`.execute(db);
   }
@@ -18,7 +18,7 @@ export async function down(db: Kysely<any>): Promise<void> {
   await db.schema.alterTable('nostr_tags').renameTo('tags').execute();
   await db.schema.alterTable('tags').renameColumn('name', 'tag').execute();
 
-  if (Conf.databaseUrl.protocol === 'sqlite:') {
+  if (Conf.db.dialect === 'sqlite') {
     await db.schema.dropTable('nostr_fts5').execute();
     await sql`CREATE VIRTUAL TABLE events_fts USING fts5(id, content)`.execute(db);
   }

src/db/migrations/020_pgfts.ts

@@ -3,7 +3,7 @@ import { Kysely, sql } from 'kysely';
 import { Conf } from '@/config.ts';
 
 export async function up(db: Kysely<any>): Promise<void> {
-  if (['postgres:', 'postgresql:'].includes(Conf.databaseUrl.protocol!)) {
+  if (Conf.db.dialect === 'postgres') {
     await db.schema.createTable('nostr_pgfts')
       .ifNotExists()
       .addColumn('event_id', 'text', (c) => c.primaryKey().references('nostr_events.id').onDelete('cascade'))
@@ -13,7 +13,7 @@ export async function up(db: Kysely<any>): Promise<void> {
 }
 
 export async function down(db: Kysely<any>): Promise<void> {
-  if (['postgres:', 'postgresql:'].includes(Conf.databaseUrl.protocol!)) {
+  if (Conf.db.dialect === 'postgres') {
     await db.schema.dropTable('nostr_pgfts').ifExists().execute();
   }
 }

src/db/migrations/021_pgfts_index.ts

@@ -3,7 +3,7 @@ import { Kysely } from 'kysely';
 import { Conf } from '@/config.ts';
 
 export async function up(db: Kysely<any>): Promise<void> {
-  if (['postgres:', 'postgresql:'].includes(Conf.databaseUrl.protocol!)) {
+  if (Conf.db.dialect === 'postgres') {
     await db.schema
       .createIndex('nostr_pgfts_gin_search_vec')
       .ifNotExists()
@@ -15,7 +15,7 @@ export async function up(db: Kysely<any>): Promise<void> {
 }
 
 export async function down(db: Kysely<any>): Promise<void> {
-  if (['postgres:', 'postgresql:'].includes(Conf.databaseUrl.protocol!)) {
+  if (Conf.db.dialect === 'postgres') {
     await db.schema.dropIndex('nostr_pgfts_gin_search_vec').ifExists().execute();
   }
 }

src/storages/EventsDB.ts

@@ -42,17 +42,8 @@ class EventsDB implements NStore {
   };
 
   constructor(private kysely: Kysely<DittoTables>) {
-    let fts: 'sqlite' | 'postgres' | undefined;
-
-    if (Conf.databaseUrl.protocol === 'sqlite:') {
-      fts = 'sqlite';
-    }
-    if (['postgres:', 'postgresql:'].includes(Conf.databaseUrl.protocol!)) {
-      fts = 'postgres';
-    }
-
     this.store = new NDatabase(kysely, {
-      fts,
+      fts: Conf.db.dialect,
       indexTags: EventsDB.indexTags,
       searchText: EventsDB.searchText,
     });

src/utils/stats.ts

@@ -6,6 +6,7 @@ import { SetRequired } from 'type-fest';
 
 import { DittoTables } from '@/db/DittoTables.ts';
 import { getTagSet } from '@/utils/tags.ts';
+import { Conf } from '@/config.ts';
 
 interface UpdateStatsOpts {
   kysely: Kysely<DittoTables>;
@@ -153,8 +154,16 @@ export async function updateAuthorStats(
     notes_count: 0,
   };
 
-  const prev = await getAuthorStats(kysely, pubkey);
+  let query = kysely
+    .selectFrom('author_stats')
+    .selectAll()
+    .where('pubkey', '=', pubkey);
 
+  if (Conf.db.dialect === 'postgres') {
+    query = query.forUpdate();
+  }
+
+  const prev = await query.executeTakeFirst();
   const stats = fn(prev ?? empty);
 
   if (prev) {
@@ -195,8 +204,16 @@ export async function updateEventStats(
     reactions: '{}',
   };
 
-  const prev = await getEventStats(kysely, eventId);
+  let query = kysely
+    .selectFrom('event_stats')
+    .selectAll()
+    .where('event_id', '=', eventId);
 
+  if (Conf.db.dialect === 'postgres') {
+    query = query.forUpdate();
+  }
+
+  const prev = await query.executeTakeFirst();
   const stats = fn(prev ?? empty);
 
   if (prev) {