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gistfile1.txt

// Copyright (c) 2016, <your name>. All rights reserved. Use of this source code
// is governed by a BSD-style license that can be found in the LICENSE file.

import 'dart:io';
import 'package:googleapis_auth/auth_io.dart' as auth;
import 'package:gcloud/db.dart';
import 'package:gcloud/storage.dart';
import 'package:gcloud/pubsub.dart';
import 'package:gcloud/src/datastore_impl.dart' as datastore_impl;
import 'dart:async';

main(List<String> args) async {
  // Read the service account credentials from the file.
  var jsonCredentials = new File('credentials.json').readAsStringSync();
  var credentials = new auth.ServiceAccountCredentials.fromJson(jsonCredentials);

// Get an HTTP authenticated client using the service account credentials.
  var scopes = []
    ..addAll(datastore_impl.DatastoreImpl.SCOPES)
    ..addAll(Storage.SCOPES)
    ..addAll(PubSub.SCOPES);
  var client = await auth.clientViaServiceAccount(credentials, scopes);

// Instantiate objects to access Cloud Datastore, Cloud Storage
// and Cloud Pub/Sub APIs.
  var db = new DatastoreDB(
      new datastore_impl.DatastoreImpl(client, 's~project-name'),
      defaultPartition: new Partition('test_namespace'));
  var storage = new Storage(client, 'project-name');
  var pubsub = new PubSub(client, 'project-name');

  // !!! No error up to this point. Getting error with status 503 (also without transaction and any other request to datastore)
  //DetailedApiRequestError(status: 503, message: Backend Error)
  db.withTransaction((t) async{
     await db.commit(inserts: [new Test()..test_field = 'Added from dart console']);
  });
}

@Kind(idType: IdType.Integer, name: 'Test')
class Test extends Model {

  @StringProperty(indexed: true, propertyName: 'test_field')
  String test_field;

}