services: make db-instance-legacy-mongo-client.ts example runnable

Author: devmatteini

packages/services/examples/db-instance-legacy-mongo-client.ts

@@ -28,19 +28,6 @@ const program = Effect.gen(function*() {
 
 /*** main.ts ***/
 
-const MyDbLive = DbInstance.fromMongoClient(
-  MyDb,
-  Effect.gen(function*() {
-    const client = yield* Effect.promise(() => LegacyConnectionPool.mongoClient("mongodb://localhost:27017"))
-    return { database: { name: "mydb" }, client }
-  })
-)
-
-await program.pipe(
-  Effect.provide(MyDbLive),
-  Effect.runPromise
-)
-
 class LegacyConnectionPool {
   private static instance: MongoClient | null = null
 
@@ -51,4 +38,22 @@ class LegacyConnectionPool {
     }
     return this.instance
   }
+
+  static async close() {
+    if (!this.instance) return
+    await this.instance.close()
+  }
 }
+
+const MyDbLive = DbInstance.fromMongoClient(
+  MyDb,
+  Effect.gen(function*() {
+    const client = yield* Effect.promise(() => LegacyConnectionPool.mongoClient("mongodb://localhost:27017"))
+    return { database: { name: "mydb" }, client }
+  })
+)
+
+await program.pipe(
+  Effect.provide(MyDbLive),
+  Effect.runPromise
+).then(() => LegacyConnectionPool.close())