private string GetQueryString <TMeasurement>(QueryRange range)
{
var measurementAttribute = (Measurement)typeof(TMeasurement).GetCustomAttribute(typeof(Measurement));
string measurementName = measurementAttribute.Name;
return(this.GetQueryString(measurementName, range));
}
public async Task <PivotData> QueryAsync(string measurementName, QueryRange range)
{
try
{
PivotData result = new PivotData();
string flux = this.GetQueryString(measurementName, range);
var fluxTables = await _queryApi.QueryAsync(flux, _org);
var table = fluxTables.FirstOrDefault();
if (table != null)
{
string[] excludedColumns = { "result", "table", "_start", "_stop" };
foreach (var column in table.Columns)
{
if (!excludedColumns.Contains(column.Label))
{
result.ColumnTypeInfo[column.Label] = column.DataType;
}
}
foreach (var record in table.Records)
{
Dictionary <string, string> recordData = new Dictionary <string, string>();
foreach (var value in record.Values)
{
var keyName = value.Key.ToString();
if (!excludedColumns.Contains(keyName))
{
recordData[keyName] = value.Value.ToString();
}
}
result.Records.Add(recordData);
}
}
else
{
return(null);
}
return(result);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return(null);
}
}
public async Task <List <TMeasurement> > QueryAsync <TMeasurement>(QueryRange range)
{
try
{
var query = this.GetQueryString <TMeasurement>(range);
return(await _queryApi.QueryAsync <TMeasurement>(query, _org));
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return(null);
}
}
private string GetQueryString(string measurementName, QueryRange range)
{
return($"from(bucket:\"{_bucket}\") |> range(start: {range.ToFluxString()})" +
$"|> filter(fn: (r) => r[\"_measurement\"] == \"{measurementName}\")" +
$"|> pivot(rowKey:[\"_time\"], columnKey: [\"_field\"], valueColumn: \"_value\")");
}