private async Task <Dictionary <Guid, Point> > ReadStorage(Dictionary <string, Tag> tags)
{
if (await _storageClient.ExistsAsync(_storagePath))
{
var pointsString = await _storageClient.ReadAllAsync(_storagePath);
var pointsDataContractList = pointsString == string.Empty
? new PointsStorageDataContract()
: JsonConvert.DeserializeObject <PointsStorageDataContract>(pointsString);
var duplicatePoints = pointsDataContractList
.GroupBy(point => point.Id)
.Where(g => g.Count() > 1);
if (duplicatePoints.Any())
{
throw new InvalidOperationException(
$"Duplicate point ids in config: {string.Join(", ", duplicatePoints)}");
}
return(pointsDataContractList.ToDictionary(
point => point.Id,
point => Point.FromDataContract(point, tags)));
}
else
{
return(new Dictionary <Guid, Point>());
}
}