mirror of https://github.com/prometheus/prometheus
192 lines
6.2 KiB
Go
192 lines
6.2 KiB
Go
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package promql
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import (
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"fmt"
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"math"
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"testing"
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"github.com/stretchr/testify/require"
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"github.com/prometheus/prometheus/model/histogram"
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"github.com/prometheus/prometheus/model/labels"
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"github.com/prometheus/prometheus/model/value"
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"github.com/prometheus/prometheus/tsdb/chunkenc"
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"github.com/prometheus/prometheus/tsdb/tsdbutil"
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)
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func TestHistogramStatsDecoding(t *testing.T) {
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cases := []struct {
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name string
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histograms []*histogram.Histogram
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expectedHints []histogram.CounterResetHint
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}{
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{
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name: "unknown counter reset triggers detection",
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histograms: []*histogram.Histogram{
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tsdbutil.GenerateTestHistogramWithHint(0, histogram.NotCounterReset),
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tsdbutil.GenerateTestHistogramWithHint(1, histogram.UnknownCounterReset),
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tsdbutil.GenerateTestHistogramWithHint(2, histogram.CounterReset),
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tsdbutil.GenerateTestHistogramWithHint(2, histogram.UnknownCounterReset),
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},
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expectedHints: []histogram.CounterResetHint{
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histogram.NotCounterReset,
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histogram.NotCounterReset,
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histogram.CounterReset,
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histogram.NotCounterReset,
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},
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},
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{
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name: "stale sample before unknown reset hint",
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histograms: []*histogram.Histogram{
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tsdbutil.GenerateTestHistogramWithHint(0, histogram.NotCounterReset),
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tsdbutil.GenerateTestHistogramWithHint(1, histogram.UnknownCounterReset),
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{Sum: math.Float64frombits(value.StaleNaN)},
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tsdbutil.GenerateTestHistogramWithHint(1, histogram.UnknownCounterReset),
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},
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expectedHints: []histogram.CounterResetHint{
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histogram.NotCounterReset,
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histogram.NotCounterReset,
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histogram.UnknownCounterReset,
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histogram.NotCounterReset,
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},
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},
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{
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name: "unknown counter reset at the beginning",
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histograms: []*histogram.Histogram{
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tsdbutil.GenerateTestHistogramWithHint(1, histogram.UnknownCounterReset),
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},
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expectedHints: []histogram.CounterResetHint{
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histogram.NotCounterReset,
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},
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},
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{
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name: "detect real counter reset",
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histograms: []*histogram.Histogram{
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tsdbutil.GenerateTestHistogramWithHint(2, histogram.UnknownCounterReset),
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tsdbutil.GenerateTestHistogramWithHint(1, histogram.UnknownCounterReset),
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},
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expectedHints: []histogram.CounterResetHint{
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histogram.NotCounterReset,
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histogram.CounterReset,
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},
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},
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{
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name: "detect real counter reset after stale NaN",
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histograms: []*histogram.Histogram{
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tsdbutil.GenerateTestHistogramWithHint(2, histogram.UnknownCounterReset),
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{Sum: math.Float64frombits(value.StaleNaN)},
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tsdbutil.GenerateTestHistogramWithHint(1, histogram.UnknownCounterReset),
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},
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expectedHints: []histogram.CounterResetHint{
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histogram.NotCounterReset,
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histogram.UnknownCounterReset,
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histogram.CounterReset,
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},
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},
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}
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for _, tc := range cases {
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t.Run(tc.name, func(t *testing.T) {
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t.Run("histogram_stats", func(t *testing.T) {
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decodedStats := make([]*histogram.Histogram, 0)
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statsIterator := NewHistogramStatsIterator(newHistogramSeries(tc.histograms).Iterator(nil))
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for statsIterator.Next() != chunkenc.ValNone {
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_, h := statsIterator.AtHistogram(nil)
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decodedStats = append(decodedStats, h)
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}
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for i := 0; i < len(tc.histograms); i++ {
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require.Equal(t, tc.expectedHints[i], decodedStats[i].CounterResetHint, fmt.Sprintf("mismatch in counter reset hint for histogram %d", i))
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h := tc.histograms[i]
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if value.IsStaleNaN(h.Sum) {
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require.True(t, value.IsStaleNaN(decodedStats[i].Sum))
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require.Equal(t, uint64(0), decodedStats[i].Count)
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} else {
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require.Equal(t, tc.histograms[i].Count, decodedStats[i].Count)
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require.Equal(t, tc.histograms[i].Sum, decodedStats[i].Sum)
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}
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}
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})
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t.Run("float_histogram_stats", func(t *testing.T) {
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decodedStats := make([]*histogram.FloatHistogram, 0)
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statsIterator := NewHistogramStatsIterator(newHistogramSeries(tc.histograms).Iterator(nil))
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for statsIterator.Next() != chunkenc.ValNone {
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_, h := statsIterator.AtFloatHistogram(nil)
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decodedStats = append(decodedStats, h)
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}
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for i := 0; i < len(tc.histograms); i++ {
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require.Equal(t, tc.expectedHints[i], decodedStats[i].CounterResetHint)
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fh := tc.histograms[i].ToFloat(nil)
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if value.IsStaleNaN(fh.Sum) {
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require.True(t, value.IsStaleNaN(decodedStats[i].Sum))
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require.Equal(t, float64(0), decodedStats[i].Count)
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} else {
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require.Equal(t, fh.Count, decodedStats[i].Count)
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require.Equal(t, fh.Sum, decodedStats[i].Sum)
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}
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}
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})
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})
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}
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}
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type histogramSeries struct {
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histograms []*histogram.Histogram
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}
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func newHistogramSeries(histograms []*histogram.Histogram) *histogramSeries {
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return &histogramSeries{
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histograms: histograms,
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}
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}
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func (m histogramSeries) Labels() labels.Labels { return labels.EmptyLabels() }
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func (m histogramSeries) Iterator(_ chunkenc.Iterator) chunkenc.Iterator {
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return &histogramIterator{
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i: -1,
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histograms: m.histograms,
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}
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}
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type histogramIterator struct {
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i int
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histograms []*histogram.Histogram
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}
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func (h *histogramIterator) Next() chunkenc.ValueType {
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h.i++
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if h.i < len(h.histograms) {
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return chunkenc.ValHistogram
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}
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return chunkenc.ValNone
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}
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func (h *histogramIterator) Seek(t int64) chunkenc.ValueType { panic("not implemented") }
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func (h *histogramIterator) At() (int64, float64) { panic("not implemented") }
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func (h *histogramIterator) AtHistogram(_ *histogram.Histogram) (int64, *histogram.Histogram) {
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return 0, h.histograms[h.i]
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}
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func (h *histogramIterator) AtFloatHistogram(_ *histogram.FloatHistogram) (int64, *histogram.FloatHistogram) {
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return 0, h.histograms[h.i].ToFloat(nil)
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}
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func (h *histogramIterator) AtT() int64 { return 0 }
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func (h *histogramIterator) Err() error { return nil }
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