carp_backend 1.4.1

CARP data backend for CARP Mobile Sensing. Supports downloading study deployments and uploading data from/to a CARP Web Service (CAWS) server.

example/lib/example.dart

import 'package:carp_backend/carp_backend.dart';
import 'package:carp_webservices/carp_services/carp_services.dart';
import 'package:carp_core/carp_core.dart';
import 'package:carp_mobile_sensing/carp_mobile_sensing.dart';
import 'package:research_package/model.dart';

void main() async {
  // -----------------------------------------------
  // CONFIGURING THE CAWS APP
  // -----------------------------------------------

  Uri uri = Uri(
    scheme: 'https',
    host: 'carp.computerome.dk',
    pathSegments: [
      'auth',
      'dev',
      'realms',
      'Carp',
    ],
  );

  // Configure an app that points to the CARP web services (CAWS)
  // CarpApp app = CarpApp(
  //   name: 'any_display_friendly_name_is_fine',
  //   uri: Uri.parse(uri),
  //   oauth: OAuthEndPoint(
  //     clientID: 'the_client_id',
  //     clientSecret: 'the_client_secret',
  //   ),
  // );

  CarpApp app = CarpApp(
    name: "CAWS @ DTU",
    uri: uri.replace(pathSegments: ['dev']),
    authURL: uri,
    clientId: 'carp-webservices-dart',
    redirectURI: uri,
    discoveryURL: uri.replace(pathSegments: [
      ...uri.pathSegments,
      '.well-known',
      'openid-configuration'
    ]),
    studyId: '<the_study_id_if_known>',
    studyDeploymentId: '<the_study_deployment_id_if_known>',
  );

  // Configure the CAWS service
  CarpService().configure(app);

  // Authenticate at CAWS
  await CarpService().authenticateWithUsernamePassword(
    username: 'the_username',
    password: 'the_password',
  );

  // Configure the other services needed.
  // Note that these CAWS services work as singletons and can be
  // accessed throughout the app.
  CarpParticipationService().configureFrom(CarpService());
  CarpDeploymentService().configureFrom(CarpService());

  // -----------------------------------------------
  // GETTING INVITATIONS FROM CAWS
  // -----------------------------------------------

  // Get the invitations to studies from CARP for this user.
  List<ActiveParticipationInvitation> invitations =
      await CarpParticipationService().getActiveParticipationInvitations();

  // Use the first (i.e. latest) invitation.
  final invitation = invitations[0];

  // ------------------------------------------------------------
  // CONFIGURING A CLIENT TO GET STUDY DEPLOYMENTS FROM CAWS
  // ------------------------------------------------------------

  // Create and configure a client manager for this phone.
  // If no deployment service is specified in the configure method,
  // the default CarpDeploymentService() singleton is used.
  final client = SmartPhoneClientManager();
  await client.configure();

  // Define the study based on the invitation and add it to the client.
  final study = await client.addStudy(
    invitation.studyDeploymentId!,
    invitation.assignedDevices!.first.device.roleName,
  );

  // Get the study controller and try to deploy the study.
  //
  // If "useCached" is true and the study has already been deployed on this
  // phone, the local cache will be used (default behavior).
  // If not deployed before (i.e., cached) the study deployment will be
  // fetched from the deployment service.
  final controller = client.getStudyRuntime(study);
  await controller?.tryDeployment(useCached: false);

  // Configure the controller
  await controller?.configure();

  // Start sampling
  controller?.start();

  // -----------------------------------------------
  // DIFFERENT WAYS TO UPLOAD DATA TO CAWS
  // -----------------------------------------------

  // First register the CAWS data manager factory
  DataManagerRegistry().register(CarpDataManagerFactory());

  // The following `CarpDataEndPoint` configurations are added to the
  // `StudyProtocol` and specifies how data is uploaded to CAWS.
  // This configuration is downloaded as part of the deployment, as shown
  // above.

  // Using the (default) data stream batch upload method.
  //
  // Using the streaming data method requires that the study deployment has
  // been obtained from CAWS. This ensures that there is a linkage between the
  // study deployment ID from the deployment and the ID in the data being
  // streamed back to CAWS.
  var streamingEndPoint = CarpDataEndPoint();

  /// Specify parameters on upload interval (in minutes), if upload only
  /// should happen when the phone is connected to WiFi, and whether data
  /// buffered locally on the phone should be deleted when uploaded.
  streamingEndPoint = CarpDataEndPoint(
    uploadInterval: 20,
    onlyUploadOnWiFi: true,
    deleteWhenUploaded: false,
  );

  // Using the "old" DataPoint endpoint for uploading batches of data points.
  var dataPointEndPoint =
      CarpDataEndPoint(uploadMethod: CarpUploadMethod.datapoint);

  // var dataPointEndPoint = CarpDataEndPoint(
  //   uploadMethod: CarpUploadMethod.datapoint,
  //   name: 'CAWS Staging Server',
  //   // uri: 'http://staging.carp.cachet.dk:8080',
  //   // clientId: 'carp',
  //   // clientSecret: 'a_secret',
  //   // email: '[e-mail]',
  //   // password: 'password',
  // );

  // Note that if a user is already authenticated to a CAWS server - for example
  // based on the download of invitations and deployments - specification of server
  // and authentication info is not needed in the CarpDataEndPoint.
  var endpoint = CarpDataEndPoint(uploadMethod: CarpUploadMethod.datapoint);

  // Using the file method would upload SQLite db files.
  var fileEndPoint = CarpDataEndPoint(uploadMethod: CarpUploadMethod.file);

  // // Using the file method would upload SQLite db files.
  // //
  // // Since this endpoint is normally "outside" download of invitation, you can
  // // specify the URI and auth info for upload.
  // fileEndPoint = CarpDataEndPoint(
  //   uploadMethod: CarpUploadMethod.file,
  //   name: 'CAWS Staging Server',
  //   // uri: 'http://staging.carp.cachet.dk:8080',
  //   // clientId: 'carp',
  //   // clientSecret: 'a_secret',
  //   // email: '[e-mail]',
  //   // password: 'password',
  // );

  // Create a study protocol with a specific data endpoint.
  SmartphoneStudyProtocol protocol = SmartphoneStudyProtocol(
    ownerId: 'AB',
    name: 'Track patient movement',
    dataEndPoint: streamingEndPoint,
  );

  // Register CAWS as a data backend where data can be uploaded
  DataManagerRegistry().register(CarpDataManagerFactory());

  // --------------------------------------------------
  // HANDLING INFORMED CONSENT FROM CARP
  // --------------------------------------------------

  // Create and initialize the informed consent manager.
  //
  // The CarpResourceManager() is a singleton that uses the
  // the CarpService() singleton for accessing CAWS. Hence,
  // CarpService needs to be authenticated and initialized before
  // using the CarpResourceManager.
  CarpResourceManager icManager = CarpResourceManager();
  icManager.initialize();

  // Create a simple informed consent...
  final consent = RPOrderedTask(identifier: '12', steps: [
    RPInstructionStep(
      identifier: "1",
      title: "Welcome!",
    )..text = "Welcome to this study! ",
    RPCompletionStep(
        identifier: "2",
        title: "Thank You!",
        text: "We saved your consent document."),
  ]);
  // .. and upload it to CAWS.
  await icManager.setInformedConsent(consent);

  // Get the informed consent back as a RPOrderedTask, if available.
  RPOrderedTask? myConsent = await icManager.getInformedConsent();
}