feat: change api framework to angel3.

api/lib/src/config/config.dart

@@ -0,0 +1,30 @@
+import 'package:angel3_configuration/angel3_configuration.dart';
+import 'package:angel3_framework/angel3_framework.dart';
+import 'package:angel3_jinja/angel3_jinja.dart';
+import 'package:file/file.dart';
+import 'plugins/plugins.dart' as plugins;
+
+/// This is a perfect place to include configuration and load plug-ins.
+AngelConfigurer configureServer(FileSystem fileSystem) {
+  return (Angel app) async {
+    // Load configuration from the `config/` directory.
+    //
+    // See: https://github.com/angel-dart/configuration
+    await app.configure(configuration(fileSystem));
+
+    // Configure our application to render jinja templates from the `views/` directory.
+    //
+    // See: https://github.com/angel-dart/jinja
+    await app.configure(jinja(path: fileSystem.directory('views').path));
+
+    // Apply another plug-ins, i.e. ones that *you* have written.
+    //
+    // Typically, the plugins in `lib/src/config/plugins/plugins.dart` are plug-ins
+    // that add functionality specific to your application.
+    //
+    // If you write a plug-in that you plan to use again, or are
+    // using one created by the community, include it in
+    // `lib/src/config/config.dart`.
+    await plugins.configureServer(app);
+  };
+}

api/lib/src/config/plugins/orm.dart

@@ -0,0 +1,35 @@
+import 'dart:async';
+import 'dart:io';
+import 'package:angel3_framework/angel3_framework.dart';
+import 'package:angel3_orm/angel3_orm.dart';
+import 'package:angel3_orm_postgres/angel3_orm_postgres.dart';
+import 'package:postgres/postgres.dart';
+
+Future<void> configureServer(Angel app) async {
+  var connection = await connectToPostgres(app.configuration);
+  await connection.open();
+
+  var logger = app.environment.isProduction ? null : app.logger;
+  var executor = PostgreSqlExecutor(connection, logger: logger);
+
+  app
+    ..container!.registerSingleton<QueryExecutor>(executor)
+    ..shutdownHooks.add((_) => connection.close());
+}
+
+Future<PostgreSQLConnection> connectToPostgres(Map configuration) async {
+  var postgresConfig = configuration['postgres'] as Map? ?? {};
+  var connection = PostgreSQLConnection(
+      postgresConfig['host'] as String? ?? 'localhost',
+      postgresConfig['port'] as int? ?? 5432,
+      postgresConfig['database_name'] as String? ??
+          Platform.environment['USER'] ??
+          Platform.environment['USERNAME'] ??
+          '',
+      username: postgresConfig['username'] as String?,
+      password: postgresConfig['password'] as String?,
+      timeZone: postgresConfig['time_zone'] as String? ?? 'UTC',
+      timeoutInSeconds: postgresConfig['timeout_in_seconds'] as int? ?? 30,
+      useSSL: postgresConfig['use_ssl'] as bool? ?? false);
+  return connection;
+}

api/lib/src/config/plugins/plugins.dart

@@ -0,0 +1,8 @@
+import 'dart:async';
+import 'package:angel3_framework/angel3_framework.dart';
+import 'orm.dart' as orm;
+
+Future configureServer(Angel app) async {
+  // Include any plugins you have made here.
+  await app.configure(orm.configureServer);
+}