upload method

Future<void> upload(File file)

Batch upload the file containing a list of DataPoints to the CARP backend.

The file can be created using a FileDataManager in carp_mobile_sensing. Note that the file should be raw JSON, and hence not zipped.

Returns when successful. Throws a CarpServiceException if not.

Implementation

Future<void> upload(File file) async {
  final String url = "$dataEndpointUri/batch";

  var request = http.MultipartRequest("POST", Uri.parse(url));
  request.headers['Authorization'] = headers['Authorization']!;
  request.headers['Content-Type'] = 'multipart/form-data';
  request.headers['cache-control'] = 'no-cache';

  request.files.add(ClonableMultipartFile.fromFileSync(file.path));

  // sending the request using the retry approach
  httpr.send(request).then((response) async {
    final int httpStatusCode = response.statusCode;

    // CARP web service returns 200 or 201 when a file is uploaded to the server
    if ((httpStatusCode == HttpStatus.ok) ||
        (httpStatusCode == HttpStatus.created)) return;

    // everything else is an exception
    response.stream.toStringStream().first.then((body) {
      final Map<String, dynamic> responseJson =
          json.decode(body) as Map<String, dynamic>;
      throw CarpServiceException(
        httpStatus: HTTPStatus(httpStatusCode, response.reasonPhrase),
        message: responseJson["message"].toString(),
        path: responseJson["path"].toString(),
      );
    });
  });
}