Regex for error extraction fails with type conflict errors

[patHyatt]

Hey there,

Given the following error response:

{"error":"write failed: field type conflict: input field \"value\" on measurement \"Bucket-Analytics-Single-Duration\" is type float64, already exists as type integer"}

In InfluxDBClient.cs
The errorLinePattern regex fails to extract any parts, yielding an ArgumentOutOfRangeException when building out the InfluxDBException on line ~217

  throw new InfluxDBException(partialWrite ? "Partial Write" : "Failed to Write", String.Format("{0}: {1} due to {2}", partialWrite ? "Partial Write" : "Failed to Write", parts?[0], parts?[2]), l);

The original error occurs in InfluxDB when a metric is initially written as one type, and subsequent types are different.

This was confirmed using the following test on the current master branch.

try
{
    var client = new InfluxDBClient("http://my.influx.server:8086", "Development", "mypassword");

    var points = new List<IInfluxDatapoint>();

    var firstPoint = new InfluxDatapoint<int>();
    firstPoint.UtcTimestamp = DateTime.UtcNow;
    firstPoint.Tags.Add("Environment", "Development");
    firstPoint.Fields.Add("value", 123);
    firstPoint.MeasurementName = "Bucket-Analytics-Single-Duration";
    firstPoint.Precision = TimePrecision.Milliseconds;
    points.Add(firstPoint);


    var secondPoint = new InfluxDatapoint<double>();
    secondPoint.UtcTimestamp = DateTime.UtcNow;
    secondPoint.Tags.Add("Environment", "Development");
    secondPoint.Fields.Add("value", 123.1234);
    secondPoint.MeasurementName = "Bucket-Analytics-Single-Duration";
    secondPoint.Precision = TimePrecision.Milliseconds;
    points.Add(secondPoint);


    var r = await client.PostPointsAsync("Development", points);
    Assert.IsTrue(r, "PostPointsAsync retunred false");
}
catch (Exception e)
{

    Assert.Fail("Unexpected exception of type {0} caught: {1}",
                e.GetType(), e.Message);
    return;
}

[mvadu]

Nice catch Patrick, never tested this combination. Currently I am away on work, I will push a fix once I get chance. In between if you want to push a PR, you are welcome. Please do add your test to the unit test project as well.