refactor health module

apps/server/src/integrations/health/postgres.health.ts

@@ -0,0 +1,38 @@
+import { InjectKysely } from 'nestjs-kysely';
+import {
+  HealthCheckError,
+  HealthIndicator,
+  HealthIndicatorResult,
+} from '@nestjs/terminus';
+import { Injectable, Logger } from '@nestjs/common';
+import { sql } from 'kysely';
+import { KyselyDB } from '@docmost/db/types/kysely.types';
+
+@Injectable()
+export class PostgresHealthIndicator extends HealthIndicator {
+  private readonly logger = new Logger(PostgresHealthIndicator.name);
+
+  constructor(@InjectKysely() private readonly db: KyselyDB) {
+    super();
+  }
+
+  async pingCheck(key: string): Promise<HealthIndicatorResult> {
+    let isHealthy = false;
+
+    try {
+      await sql`SELECT 1=1`.execute(this.db);
+      isHealthy = true;
+    } catch (e) {
+      this.logger.error(JSON.stringify(e));
+    }
+
+    if (isHealthy) {
+      return this.getStatus(key, isHealthy);
+    } else {
+      throw new HealthCheckError(
+        `${key} is not available`,
+        this.getStatus(key, isHealthy),
+      );
+    }
+  }
+}