mirror of
https://github.com/prometheus/prometheus
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f1065e44a4
This includes a regular bucket iterator and a string method for histogram.Bucket. Signed-off-by: beorn7 <beorn@grafana.com>
388 lines
15 KiB
Go
388 lines
15 KiB
Go
// Copyright 2021 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 histogram
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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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)
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func TestHistogramString(t *testing.T) {
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cases := []struct {
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histogram Histogram
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expectedString string
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}{
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{
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histogram: Histogram{
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Schema: 0,
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},
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expectedString: "{count:0, sum:0}",
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},
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{
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histogram: Histogram{
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Schema: 0,
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Count: 9,
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Sum: -3.1415,
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ZeroCount: 12,
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ZeroThreshold: 0.001,
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NegativeSpans: []Span{
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{Offset: 0, Length: 5},
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{Offset: 1, Length: 1},
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},
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NegativeBuckets: []int64{1, 2, -2, 1, -1, 0},
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},
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expectedString: "{count:9, sum:-3.1415, [-64,-32):1, [-16,-8):1, [-8,-4):2, [-4,-2):1, [-2,-1):3, [-1,-0.5):1, [-0.001,0.001]:12}",
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},
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{
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histogram: Histogram{
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Schema: 0,
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Count: 19,
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Sum: 2.7,
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PositiveSpans: []Span{
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{Offset: 0, Length: 4},
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{Offset: 0, Length: 0},
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{Offset: 0, Length: 3},
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},
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PositiveBuckets: []int64{1, 2, -2, 1, -1, 0, 0},
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NegativeSpans: []Span{
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{Offset: 0, Length: 5},
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{Offset: 1, Length: 0},
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{Offset: 0, Length: 1},
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},
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NegativeBuckets: []int64{1, 2, -2, 1, -1, 0},
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},
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expectedString: "{count:19, sum:2.7, [-64,-32):1, [-16,-8):1, [-8,-4):2, [-4,-2):1, [-2,-1):3, [-1,-0.5):1, (0.5,1]:1, (1,2]:3, (2,4]:1, (4,8]:2, (8,16]:1, (16,32]:1, (32,64]:1}",
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},
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}
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for i, c := range cases {
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t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
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actualString := c.histogram.String()
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require.Equal(t, c.expectedString, actualString)
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})
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}
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}
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func TestCumulativeBucketIterator(t *testing.T) {
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cases := []struct {
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histogram Histogram
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expectedBuckets []Bucket
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}{
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{
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histogram: Histogram{
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Schema: 0,
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PositiveSpans: []Span{
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{Offset: 0, Length: 2},
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{Offset: 1, Length: 2},
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},
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PositiveBuckets: []int64{1, 1, -1, 0},
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},
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expectedBuckets: []Bucket{
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{Lower: math.Inf(-1), Upper: 1, Count: 1, LowerInclusive: true, UpperInclusive: true, Index: 0},
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{Lower: math.Inf(-1), Upper: 2, Count: 3, LowerInclusive: true, UpperInclusive: true, Index: 1},
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{Lower: math.Inf(-1), Upper: 4, Count: 3, LowerInclusive: true, UpperInclusive: true, Index: 2},
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{Lower: math.Inf(-1), Upper: 8, Count: 4, LowerInclusive: true, UpperInclusive: true, Index: 3},
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{Lower: math.Inf(-1), Upper: 16, Count: 5, LowerInclusive: true, UpperInclusive: true, Index: 4},
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},
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},
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{
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histogram: Histogram{
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Schema: 0,
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PositiveSpans: []Span{
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{Offset: 0, Length: 5},
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{Offset: 1, Length: 1},
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},
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PositiveBuckets: []int64{1, 2, -2, 1, -1, 0},
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},
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expectedBuckets: []Bucket{
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{Lower: math.Inf(-1), Upper: 1, Count: 1, LowerInclusive: true, UpperInclusive: true, Index: 0},
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{Lower: math.Inf(-1), Upper: 2, Count: 4, LowerInclusive: true, UpperInclusive: true, Index: 1},
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{Lower: math.Inf(-1), Upper: 4, Count: 5, LowerInclusive: true, UpperInclusive: true, Index: 2},
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{Lower: math.Inf(-1), Upper: 8, Count: 7, LowerInclusive: true, UpperInclusive: true, Index: 3},
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{Lower: math.Inf(-1), Upper: 16, Count: 8, LowerInclusive: true, UpperInclusive: true, Index: 4},
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{Lower: math.Inf(-1), Upper: 32, Count: 8, LowerInclusive: true, UpperInclusive: true, Index: 5},
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{Lower: math.Inf(-1), Upper: 64, Count: 9, LowerInclusive: true, UpperInclusive: true, Index: 6},
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},
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},
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{
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histogram: Histogram{
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Schema: 0,
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PositiveSpans: []Span{
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{Offset: 0, Length: 7},
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},
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PositiveBuckets: []int64{1, 2, -2, 1, -1, 0, 0},
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},
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expectedBuckets: []Bucket{
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{Lower: math.Inf(-1), Upper: 1, Count: 1, LowerInclusive: true, UpperInclusive: true, Index: 0},
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{Lower: math.Inf(-1), Upper: 2, Count: 4, LowerInclusive: true, UpperInclusive: true, Index: 1},
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{Lower: math.Inf(-1), Upper: 4, Count: 5, LowerInclusive: true, UpperInclusive: true, Index: 2},
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{Lower: math.Inf(-1), Upper: 8, Count: 7, LowerInclusive: true, UpperInclusive: true, Index: 3},
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{Lower: math.Inf(-1), Upper: 16, Count: 8, LowerInclusive: true, UpperInclusive: true, Index: 4},
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{Lower: math.Inf(-1), Upper: 32, Count: 9, LowerInclusive: true, UpperInclusive: true, Index: 5},
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{Lower: math.Inf(-1), Upper: 64, Count: 10, LowerInclusive: true, UpperInclusive: true, Index: 6},
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},
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},
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{
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histogram: Histogram{
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Schema: 3,
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PositiveSpans: []Span{
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{Offset: -5, Length: 2}, // -5 -4
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{Offset: 2, Length: 3}, // -1 0 1
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{Offset: 2, Length: 2}, // 4 5
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},
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PositiveBuckets: []int64{1, 2, -2, 1, -1, 0, 3},
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},
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expectedBuckets: []Bucket{
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{Lower: math.Inf(-1), Upper: 0.6484197773255048, Count: 1, LowerInclusive: true, UpperInclusive: true, Index: -5},
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{Lower: math.Inf(-1), Upper: 0.7071067811865475, Count: 4, LowerInclusive: true, UpperInclusive: true, Index: -4},
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{Lower: math.Inf(-1), Upper: 0.7711054127039704, Count: 4, LowerInclusive: true, UpperInclusive: true, Index: -3},
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{Lower: math.Inf(-1), Upper: 0.8408964152537144, Count: 4, LowerInclusive: true, UpperInclusive: true, Index: -2},
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{Lower: math.Inf(-1), Upper: 0.9170040432046711, Count: 5, LowerInclusive: true, UpperInclusive: true, Index: -1},
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{Lower: math.Inf(-1), Upper: 1, Count: 7, LowerInclusive: true, UpperInclusive: true, Index: 0},
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{Lower: math.Inf(-1), Upper: 1.0905077326652577, Count: 8, LowerInclusive: true, UpperInclusive: true, Index: 1},
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{Lower: math.Inf(-1), Upper: 1.189207115002721, Count: 8, LowerInclusive: true, UpperInclusive: true, Index: 2},
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{Lower: math.Inf(-1), Upper: 1.2968395546510096, Count: 8, LowerInclusive: true, UpperInclusive: true, Index: 3},
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{Lower: math.Inf(-1), Upper: 1.414213562373095, Count: 9, LowerInclusive: true, UpperInclusive: true, Index: 4},
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{Lower: math.Inf(-1), Upper: 1.5422108254079407, Count: 13, LowerInclusive: true, UpperInclusive: true, Index: 5},
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},
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},
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{
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histogram: Histogram{
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Schema: -2,
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PositiveSpans: []Span{
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{Offset: -2, Length: 4}, // -2 -1 0 1
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{Offset: 2, Length: 2}, // 4 5
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},
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PositiveBuckets: []int64{1, 2, -2, 1, -1, 0},
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},
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expectedBuckets: []Bucket{
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{Lower: math.Inf(-1), Upper: 0.00390625, Count: 1, LowerInclusive: true, UpperInclusive: true, Index: -2},
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{Lower: math.Inf(-1), Upper: 0.0625, Count: 4, LowerInclusive: true, UpperInclusive: true, Index: -1},
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{Lower: math.Inf(-1), Upper: 1, Count: 5, LowerInclusive: true, UpperInclusive: true, Index: 0},
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{Lower: math.Inf(-1), Upper: 16, Count: 7, LowerInclusive: true, UpperInclusive: true, Index: 1},
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{Lower: math.Inf(-1), Upper: 256, Count: 7, LowerInclusive: true, UpperInclusive: true, Index: 2},
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{Lower: math.Inf(-1), Upper: 4096, Count: 7, LowerInclusive: true, UpperInclusive: true, Index: 3},
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{Lower: math.Inf(-1), Upper: 65536, Count: 8, LowerInclusive: true, UpperInclusive: true, Index: 4},
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{Lower: math.Inf(-1), Upper: 1048576, Count: 9, LowerInclusive: true, UpperInclusive: true, Index: 5},
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},
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},
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{
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histogram: Histogram{
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Schema: -1,
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PositiveSpans: []Span{
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{Offset: -2, Length: 5}, // -2 -1 0 1 2
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},
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PositiveBuckets: []int64{1, 2, -2, 1, -1},
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},
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expectedBuckets: []Bucket{
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{Lower: math.Inf(-1), Upper: 0.0625, Count: 1, LowerInclusive: true, UpperInclusive: true, Index: -2},
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{Lower: math.Inf(-1), Upper: 0.25, Count: 4, LowerInclusive: true, UpperInclusive: true, Index: -1},
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{Lower: math.Inf(-1), Upper: 1, Count: 5, LowerInclusive: true, UpperInclusive: true, Index: 0},
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{Lower: math.Inf(-1), Upper: 4, Count: 7, LowerInclusive: true, UpperInclusive: true, Index: 1},
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{Lower: math.Inf(-1), Upper: 16, Count: 8, LowerInclusive: true, UpperInclusive: true, Index: 2},
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},
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},
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}
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for i, c := range cases {
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t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
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it := c.histogram.CumulativeBucketIterator()
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actualBuckets := make([]Bucket, 0, len(c.expectedBuckets))
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for it.Next() {
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actualBuckets = append(actualBuckets, it.At())
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}
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require.Equal(t, c.expectedBuckets, actualBuckets)
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})
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}
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}
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func TestRegularBucketIterator(t *testing.T) {
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cases := []struct {
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histogram Histogram
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expectedPositiveBuckets []Bucket
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expectedNegativeBuckets []Bucket
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}{
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{
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histogram: Histogram{
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Schema: 0,
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},
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expectedPositiveBuckets: []Bucket{},
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expectedNegativeBuckets: []Bucket{},
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},
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{
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histogram: Histogram{
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Schema: 0,
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PositiveSpans: []Span{
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{Offset: 0, Length: 2},
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{Offset: 1, Length: 2},
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},
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PositiveBuckets: []int64{1, 1, -1, 0},
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},
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expectedPositiveBuckets: []Bucket{
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{Lower: 0.5, Upper: 1, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 0},
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{Lower: 1, Upper: 2, Count: 2, LowerInclusive: false, UpperInclusive: true, Index: 1},
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{Lower: 4, Upper: 8, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 3},
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{Lower: 8, Upper: 16, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 4},
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},
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expectedNegativeBuckets: []Bucket{},
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},
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{
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histogram: Histogram{
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Schema: 0,
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NegativeSpans: []Span{
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{Offset: 0, Length: 5},
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{Offset: 1, Length: 1},
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},
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NegativeBuckets: []int64{1, 2, -2, 1, -1, 0},
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},
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expectedPositiveBuckets: []Bucket{},
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expectedNegativeBuckets: []Bucket{
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{Lower: -1, Upper: -0.5, Count: 1, LowerInclusive: true, UpperInclusive: false, Index: 0},
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{Lower: -2, Upper: -1, Count: 3, LowerInclusive: true, UpperInclusive: false, Index: 1},
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{Lower: -4, Upper: -2, Count: 1, LowerInclusive: true, UpperInclusive: false, Index: 2},
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{Lower: -8, Upper: -4, Count: 2, LowerInclusive: true, UpperInclusive: false, Index: 3},
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{Lower: -16, Upper: -8, Count: 1, LowerInclusive: true, UpperInclusive: false, Index: 4},
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{Lower: -64, Upper: -32, Count: 1, LowerInclusive: true, UpperInclusive: false, Index: 6},
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},
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},
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{
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histogram: Histogram{
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Schema: 0,
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PositiveSpans: []Span{
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{Offset: 0, Length: 4},
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{Offset: 0, Length: 0},
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{Offset: 0, Length: 3},
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},
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PositiveBuckets: []int64{1, 2, -2, 1, -1, 0, 0},
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NegativeSpans: []Span{
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{Offset: 0, Length: 5},
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{Offset: 1, Length: 0},
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{Offset: 0, Length: 1},
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},
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NegativeBuckets: []int64{1, 2, -2, 1, -1, 0},
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},
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expectedPositiveBuckets: []Bucket{
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{Lower: 0.5, Upper: 1, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 0},
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{Lower: 1, Upper: 2, Count: 3, LowerInclusive: false, UpperInclusive: true, Index: 1},
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{Lower: 2, Upper: 4, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 2},
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{Lower: 4, Upper: 8, Count: 2, LowerInclusive: false, UpperInclusive: true, Index: 3},
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{Lower: 8, Upper: 16, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 4},
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{Lower: 16, Upper: 32, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 5},
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{Lower: 32, Upper: 64, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 6},
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},
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expectedNegativeBuckets: []Bucket{
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{Lower: -1, Upper: -0.5, Count: 1, LowerInclusive: true, UpperInclusive: false, Index: 0},
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{Lower: -2, Upper: -1, Count: 3, LowerInclusive: true, UpperInclusive: false, Index: 1},
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{Lower: -4, Upper: -2, Count: 1, LowerInclusive: true, UpperInclusive: false, Index: 2},
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{Lower: -8, Upper: -4, Count: 2, LowerInclusive: true, UpperInclusive: false, Index: 3},
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{Lower: -16, Upper: -8, Count: 1, LowerInclusive: true, UpperInclusive: false, Index: 4},
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{Lower: -64, Upper: -32, Count: 1, LowerInclusive: true, UpperInclusive: false, Index: 6},
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},
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},
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{
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histogram: Histogram{
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Schema: 3,
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PositiveSpans: []Span{
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{Offset: -5, Length: 2}, // -5 -4
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{Offset: 2, Length: 3}, // -1 0 1
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{Offset: 2, Length: 2}, // 4 5
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},
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PositiveBuckets: []int64{1, 2, -2, 1, -1, 0, 3},
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},
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expectedPositiveBuckets: []Bucket{
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{Lower: 0.5946035575013605, Upper: 0.6484197773255048, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: -5},
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{Lower: 0.6484197773255048, Upper: 0.7071067811865475, Count: 3, LowerInclusive: false, UpperInclusive: true, Index: -4},
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{Lower: 0.8408964152537144, Upper: 0.9170040432046711, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: -1},
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{Lower: 0.9170040432046711, Upper: 1, Count: 2, LowerInclusive: false, UpperInclusive: true, Index: 0},
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{Lower: 1, Upper: 1.0905077326652577, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 1},
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{Lower: 1.2968395546510096, Upper: 1.414213562373095, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 4},
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{Lower: 1.414213562373095, Upper: 1.5422108254079407, Count: 4, LowerInclusive: false, UpperInclusive: true, Index: 5},
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},
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expectedNegativeBuckets: []Bucket{},
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},
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{
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histogram: Histogram{
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Schema: -2,
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PositiveSpans: []Span{
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{Offset: -2, Length: 4}, // -2 -1 0 1
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{Offset: 2, Length: 2}, // 4 5
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},
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PositiveBuckets: []int64{1, 2, -2, 1, -1, 0},
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},
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expectedPositiveBuckets: []Bucket{
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{Lower: 0.000244140625, Upper: 0.00390625, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: -2},
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{Lower: 0.00390625, Upper: 0.0625, Count: 3, LowerInclusive: false, UpperInclusive: true, Index: -1},
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{Lower: 0.0625, Upper: 1, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 0},
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{Lower: 1, Upper: 16, Count: 2, LowerInclusive: false, UpperInclusive: true, Index: 1},
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{Lower: 4096, Upper: 65536, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 4},
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{Lower: 65536, Upper: 1048576, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 5},
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},
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expectedNegativeBuckets: []Bucket{},
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},
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{
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histogram: Histogram{
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Schema: -1,
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PositiveSpans: []Span{
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{Offset: -2, Length: 5}, // -2 -1 0 1 2
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},
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PositiveBuckets: []int64{1, 2, -2, 1, -1},
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},
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expectedPositiveBuckets: []Bucket{
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{Lower: 0.015625, Upper: 0.0625, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: -2},
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{Lower: 0.0625, Upper: 0.25, Count: 3, LowerInclusive: false, UpperInclusive: true, Index: -1},
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{Lower: 0.25, Upper: 1, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 0},
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{Lower: 1, Upper: 4, Count: 2, LowerInclusive: false, UpperInclusive: true, Index: 1},
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{Lower: 4, Upper: 16, Count: 1, LowerInclusive: false, UpperInclusive: true, Index: 2},
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},
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expectedNegativeBuckets: []Bucket{},
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},
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}
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for i, c := range cases {
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t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
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it := c.histogram.PositiveBucketIterator()
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actualPositiveBuckets := make([]Bucket, 0, len(c.expectedPositiveBuckets))
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for it.Next() {
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actualPositiveBuckets = append(actualPositiveBuckets, it.At())
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}
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require.Equal(t, c.expectedPositiveBuckets, actualPositiveBuckets)
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it = c.histogram.NegativeBucketIterator()
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actualNegativeBuckets := make([]Bucket, 0, len(c.expectedNegativeBuckets))
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for it.Next() {
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actualNegativeBuckets = append(actualNegativeBuckets, it.At())
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}
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require.Equal(t, c.expectedNegativeBuckets, actualNegativeBuckets)
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})
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}
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}
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