public void Test(string cultureInfo)
{
if (!string.IsNullOrEmpty(cultureInfo))
{
Thread.CurrentThread.CurrentCulture = new CultureInfo(cultureInfo);
}
using var stream = new MemoryStream();
using var writer = new StreamWriter(stream);
var builder = new PrometheusMetricBuilder();
builder.WithName("test-builder");
builder.WithDescription("test-description");
builder.WithType("test-type");
var metricValueBuilder = builder.AddValue();
metricValueBuilder = metricValueBuilder.WithValue(10.0123);
metricValueBuilder.WithLabel("test-double", "double");
builder.Write(writer);
writer.Flush();
// assert
string actual = Encoding.UTF8.GetString(stream.ToArray());
string[] lines = actual.Split('\n');
Assert.Equal("# HELP test_buildertest-description", lines[0]);
Assert.Equal("# TYPE test_builder test-type", lines[1]);
Assert.StartsWith("test_builder{test_double=\"double\"} 10.01", lines[2]);
}
private void WorkerThread()
{
this.httpListener.Start();
try
{
while (!this.tokenSource.IsCancellationRequested)
{
var ctxTask = this.httpListener.GetContextAsync();
ctxTask.Wait(this.tokenSource.Token);
var ctx = ctxTask.Result;
ctx.Response.StatusCode = 200;
ctx.Response.ContentType = PrometheusMetricBuilder.ContentType;
using (var output = ctx.Response.OutputStream)
{
using (var writer = new StreamWriter(output))
{
foreach (var metric in this.exporter.Metrics)
{
var labels = metric.Labels;
var value = metric.Value;
var builder = new PrometheusMetricBuilder()
.WithName(metric.MetricName)
.WithDescription(metric.MetricDescription);
builder = builder.WithType("counter");
foreach (var label in labels)
{
var metricValueBuilder = builder.AddValue();
metricValueBuilder = metricValueBuilder.WithValue(value);
metricValueBuilder.WithLabel(label.Key, label.Value);
}
builder.Write(writer);
}
}
}
}
}
catch (OperationCanceledException)
{
// this will happen when cancellation will be requested
}
catch (Exception)
{
// TODO: report error
}
finally
{
this.httpListener.Stop();
this.httpListener.Close();
}
}
private static void WriteSummary(
StreamWriter writer,
PrometheusMetricBuilder builder,
IEnumerable <KeyValuePair <string, string> > labels,
string metricName,
double sum,
long count,
double min,
double max)
{
builder = builder.WithType(PrometheusSummaryType);
foreach (var label in labels)
{
/* For Summary we emit one row for Sum, Count, Min, Max.
* Min,Max exportes as quantile 0 and 1.
* In future, when OT implements more aggregation algorithms,
* this section will need to be revisited.
* Sample output:
* MyMeasure_sum{dim1="value1"} 750 1587013352982
* MyMeasure_count{dim1="value1"} 5 1587013352982
* MyMeasure{dim1="value2",quantile="0"} 150 1587013352982
* MyMeasure{dim1="value2",quantile="1"} 150 1587013352982
*/
var metricValueBuilder = builder.AddValue();
metricValueBuilder.WithName(metricName + PrometheusSummarySumPostFix);
metricValueBuilder = metricValueBuilder.WithValue(sum);
metricValueBuilder.WithLabel(label.Key, label.Value);
metricValueBuilder = builder.AddValue();
metricValueBuilder.WithName(metricName + PrometheusSummaryCountPostFix);
metricValueBuilder = metricValueBuilder.WithValue(count);
metricValueBuilder.WithLabel(label.Key, label.Value);
metricValueBuilder = builder.AddValue();
metricValueBuilder.WithName(metricName);
metricValueBuilder = metricValueBuilder.WithValue(min);
metricValueBuilder.WithLabel(label.Key, label.Value);
metricValueBuilder.WithLabel(PrometheusSummaryQuantileLabelName, PrometheusSummaryQuantileLabelValueForMin);
metricValueBuilder = builder.AddValue();
metricValueBuilder.WithName(metricName);
metricValueBuilder = metricValueBuilder.WithValue(max);
metricValueBuilder.WithLabel(label.Key, label.Value);
metricValueBuilder.WithLabel(PrometheusSummaryQuantileLabelName, PrometheusSummaryQuantileLabelValueForMax);
}
builder.Write(writer);
}
private static void WriteSum(StreamWriter writer, PrometheusMetricBuilder builder, IEnumerable <KeyValuePair <string, string> > labels, double doubleValue)
{
builder = builder.WithType(PrometheusCounterType);
var metricValueBuilder = builder.AddValue();
metricValueBuilder = metricValueBuilder.WithValue(doubleValue);
foreach (var label in labels)
{
metricValueBuilder.WithLabel(label.Key, label.Value);
}
builder.Write(writer);
}
private static void WriteHistogram(
StreamWriter writer,
PrometheusMetricBuilder builder,
IEnumerable <KeyValuePair <string, object> > labels,
string metricName,
double sum,
long count,
IEnumerable <HistogramBucket> buckets)
{
/* For Histogram we emit one row for Sum, Count and as
* many rows as number of buckets.
* myHistogram_sum{tag1="value1",tag2="value2"} 258330 1629860660991
* myHistogram_count{tag1="value1",tag2="value2"} 355 1629860660991
* myHistogram_bucket{tag1="value1",tag2="value2",le="0"} 0 1629860660991
* myHistogram_bucket{tag1="value1",tag2="value2",le="5"} 2 1629860660991
* myHistogram_bucket{tag1="value1",tag2="value2",le="10"} 4 1629860660991
* myHistogram_bucket{tag1="value1",tag2="value2",le="25"} 6 1629860660991
* myHistogram_bucket{tag1="value1",tag2="value2",le="50"} 12 1629860660991
* myHistogram_bucket{tag1="value1",tag2="value2",le="75"} 19 1629860660991
* myHistogram_bucket{tag1="value1",tag2="value2",le="100"} 26 1629860660991
* myHistogram_bucket{tag1="value1",tag2="value2",le="250"} 65 1629860660991
* myHistogram_bucket{tag1="value1",tag2="value2",le="500"} 128 1629860660991
* myHistogram_bucket{tag1="value1",tag2="value2",le="1000"} 241 1629860660991
* myHistogram_bucket{tag1="value1",tag2="value2",le="+Inf"} 355 1629860660991
*/
builder = builder.WithType(PrometheusHistogramType);
var metricValueBuilderSum = builder.AddValue();
metricValueBuilderSum.WithName(metricName + PrometheusHistogramSumPostFix);
metricValueBuilderSum = metricValueBuilderSum.WithValue(sum);
foreach (var label in labels)
{
metricValueBuilderSum.WithLabel(label.Key, label.Value.ToString());
}
var metricValueBuilderCount = builder.AddValue();
metricValueBuilderCount.WithName(metricName + PrometheusHistogramCountPostFix);
metricValueBuilderCount = metricValueBuilderCount.WithValue(count);
foreach (var label in labels)
{
metricValueBuilderCount.WithLabel(label.Key, label.Value.ToString());
}
long totalCount = 0;
foreach (var bucket in buckets)
{
totalCount += bucket.Count;
var metricValueBuilderBuckets = builder.AddValue();
metricValueBuilderBuckets.WithName(metricName + PrometheusHistogramBucketPostFix);
metricValueBuilderBuckets = metricValueBuilderBuckets.WithValue(totalCount);
foreach (var label in labels)
{
metricValueBuilderBuckets.WithLabel(label.Key, label.Value.ToString());
}
var bucketName = double.IsPositiveInfinity(bucket.HighBoundary) ?
PrometheusHistogramBucketLabelPositiveInfinity : bucket.HighBoundary.ToString(CultureInfo.InvariantCulture);
metricValueBuilderBuckets.WithLabel(PrometheusHistogramBucketLabelLessThan, bucketName);
}
builder.Write(writer);
}
private void WorkerThread()
{
this.httpListener.Start();
try
{
while (!this.tokenSource.IsCancellationRequested)
{
var ctxTask = this.httpListener.GetContextAsync();
ctxTask.Wait(this.tokenSource.Token);
var ctx = ctxTask.Result;
ctx.Response.StatusCode = 200;
ctx.Response.ContentType = PrometheusMetricBuilder.ContentType;
using var output = ctx.Response.OutputStream;
using var writer = new StreamWriter(output);
foreach (var metric in this.exporter.GetAndClearDoubleMetrics())
{
var labels = metric.Labels;
var builder = new PrometheusMetricBuilder()
.WithName(metric.MetricName)
.WithDescription(metric.MetricDescription);
switch (metric.AggregationType)
{
case AggregationType.DoubleSum:
{
var doubleSum = metric.Data as SumData <double>;
var doubleValue = doubleSum.Sum;
builder = builder.WithType("counter");
foreach (var label in labels)
{
var metricValueBuilder = builder.AddValue();
metricValueBuilder = metricValueBuilder.WithValue(doubleValue);
metricValueBuilder.WithLabel(label.Key, label.Value);
}
builder.Write(writer);
break;
}
case AggregationType.LongSum:
{
// This cannot occcur as we are iterating Double metrics.
// TODO: report error
break;
}
case AggregationType.Summary:
{
// Not supported yet.
break;
}
}
}
foreach (var metric in this.exporter.GetAndClearLongMetrics())
{
var labels = metric.Labels;
var builder = new PrometheusMetricBuilder()
.WithName(metric.MetricName)
.WithDescription(metric.MetricDescription);
switch (metric.AggregationType)
{
case AggregationType.DoubleSum:
{
// This cannot occcur as we are iterating Long metrics.
// TODO: report error
break;
}
case AggregationType.LongSum:
{
var longSum = metric.Data as SumData <long>;
var longValue = longSum.Sum;
builder = builder.WithType("counter");
foreach (var label in labels)
{
var metricValueBuilder = builder.AddValue();
metricValueBuilder = metricValueBuilder.WithValue(longValue);
metricValueBuilder.WithLabel(label.Key, label.Value);
}
builder.Write(writer);
break;
}
case AggregationType.Summary:
{
// Not supported yet.
break;
}
}
}
}
}
catch (OperationCanceledException)
{
// this will happen when cancellation will be requested
}
catch (Exception)
{
// TODO: report error
}
finally
{
this.httpListener.Stop();
this.httpListener.Close();
}
}
/// <summary>
/// Serialize to Prometheus Format.
/// </summary>
/// <param name="exporter">Prometheus Exporter.</param>
/// <param name="writer">StreamWriter to write to.</param>
public static void WriteMetricsCollection(this PrometheusExporter exporter, StreamWriter writer)
{
foreach (var metric in exporter.GetAndClearDoubleMetrics())
{
var labels = metric.Labels;
var builder = new PrometheusMetricBuilder()
.WithName(metric.MetricName)
.WithDescription(metric.MetricDescription);
switch (metric.AggregationType)
{
case AggregationType.DoubleSum:
{
var doubleSum = metric.Data as SumData <double>;
var doubleValue = doubleSum.Sum;
builder = builder.WithType("counter");
foreach (var label in labels)
{
var metricValueBuilder = builder.AddValue();
metricValueBuilder = metricValueBuilder.WithValue(doubleValue);
metricValueBuilder.WithLabel(label.Key, label.Value);
}
builder.Write(writer);
break;
}
case AggregationType.Summary:
{
// Not supported yet.
break;
}
}
}
foreach (var metric in exporter.GetAndClearLongMetrics())
{
var labels = metric.Labels;
var builder = new PrometheusMetricBuilder()
.WithName(metric.MetricName)
.WithDescription(metric.MetricDescription);
switch (metric.AggregationType)
{
case AggregationType.LongSum:
{
var longSum = metric.Data as SumData <long>;
var longValue = longSum.Sum;
builder = builder.WithType("counter");
foreach (var label in labels)
{
var metricValueBuilder = builder.AddValue();
metricValueBuilder = metricValueBuilder.WithValue(longValue);
metricValueBuilder.WithLabel(label.Key, label.Value);
}
builder.Write(writer);
break;
}
case AggregationType.Summary:
{
// Not supported yet.
break;
}
}
}
}