add poolsize and availableconnections metrics back

src/db/DittoDB.ts

@@ -39,14 +39,14 @@ export class DittoDB {
 
   static get poolSize(): number {
     if (Conf.db.dialect === 'postgres') {
-      return DittoPostgres.getPool().size;
+      return DittoPostgres.poolSize;
     }
     return 1;
   }
 
   static get availableConnections(): number {
     if (Conf.db.dialect === 'postgres') {
-      return DittoPostgres.getPool().available;
+      return DittoPostgres.availableConnections;
     }
     return 1;
   }

src/db/adapters/DittoPostgres.ts

@@ -8,13 +8,18 @@ import { KyselyLogger } from '@/db/KyselyLogger.ts';
 
 export class DittoPostgres {
   static db: Kysely<DittoTables> | undefined;
+  static postgres: postgres.Sql;
 
   // deno-lint-ignore require-await
   static async getInstance(): Promise<Kysely<DittoTables>> {
+    if (!this.postgres) {
+      this.postgres = postgres(Conf.databaseUrl, { max: Conf.pg.poolSize }) as any;
+    }
+
     if (!this.db) {
       this.db = new Kysely({
         dialect: new PostgresJSDialect({
-          postgres: postgres(Conf.databaseUrl) as any,
+          postgres: this.postgres,
         }),
         log: KyselyLogger,
       });
@@ -22,4 +27,14 @@ export class DittoPostgres {
 
     return this.db;
   }
+
+  static get poolSize() {
+    return Conf.pg.poolSize;
+  }
+
+  static get availableConnections(): number {
+    // blocked by https://github.com/porsager/postgres/pull/911
+    // return this.postgres.availableConnections;
+    return 1;
+  }
 }