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prometheus/tsdb/head_read_test.go
beorn7 747c5ee2b1 Apply analyzer "modernize" to the whole codebase 
See
https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/modernize
for details.

This ran into a few issues (arguably bugs in the modernize tool),
which I will fix in the next commit, so that we have transparency what
was done automatically.

Beyond those hiccups, I believe all the changes applied are
legitimate. Even where there might be no tangible direct gain, I would
argue it's still better to use the "modern" way to avoid micro
discussions in tiny style PRs later.

Signed-off-by: beorn7 <beorn@grafana.com>
2025-08-27 14:48:41 +02:00

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// Copyright 2021 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tsdb
import (
"context"
"sync"
"testing"
"github.com/stretchr/testify/require"
"github.com/prometheus/prometheus/model/labels"
"github.com/prometheus/prometheus/tsdb/chunkenc"
"github.com/prometheus/prometheus/tsdb/chunks"
)
// TestMemSeries_chunk runs a series of tests on memSeries.chunk() calls.
// It will simulate various conditions to ensure all code paths in that function are covered.
func TestMemSeries_chunk(t *testing.T) {
const chunkRange int64 = 100
const chunkStep int64 = 5
appendSamples := func(t *testing.T, s *memSeries, start, end int64, cdm *chunks.ChunkDiskMapper) {
for i := start; i < end; i += chunkStep {
ok, _ := s.append(i, float64(i), 0, chunkOpts{
chunkDiskMapper: cdm,
chunkRange: chunkRange,
samplesPerChunk: DefaultSamplesPerChunk,
})
require.True(t, ok, "sample append failed")
}
}
type setupFn func(*testing.T, *memSeries, *chunks.ChunkDiskMapper)
type callOutput uint8
const (
outOpenHeadChunk callOutput = iota // memSeries.chunk() call returned memSeries.headChunks with headChunk=true & isOpen=true
outClosedHeadChunk // memSeries.chunk() call returned memSeries.headChunks with headChunk=true & isOpen=false
outMmappedChunk // memSeries.chunk() call returned a chunk from memSeries.mmappedChunks with headChunk=false
outErr // memSeries.chunk() call returned an error
)
tests := []struct {
name string
setup setupFn // optional function called just before the test memSeries.chunk() call
inputID chunks.HeadChunkID // requested chunk id for memSeries.chunk() call
expected callOutput
}{
{
name: "call ix=0 on empty memSeries",
inputID: 0,
expected: outErr,
},
{
name: "call ix=1 on empty memSeries",
inputID: 1,
expected: outErr,
},
{
name: "firstChunkID > ix",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange, cdm)
require.Empty(t, s.mmappedChunks, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, int64(0), s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, chunkRange-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
s.firstChunkID = 5
},
inputID: 1,
expected: outErr,
},
{
name: "call ix=0 on memSeries with no mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange, cdm)
require.Empty(t, s.mmappedChunks, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, int64(0), s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, chunkRange-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 0,
expected: outOpenHeadChunk,
},
{
name: "call ix=1 on memSeries with no mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange, cdm)
require.Empty(t, s.mmappedChunks, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, int64(0), s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, chunkRange-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 1,
expected: outErr,
},
{
name: "call ix=10 on memSeries with no mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange, cdm)
require.Empty(t, s.mmappedChunks, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, int64(0), s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, chunkRange-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 10,
expected: outErr,
},
{
name: "call ix=0 on memSeries with 3 mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*4)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 0,
expected: outMmappedChunk,
},
{
name: "call ix=1 on memSeries with 3 mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*4)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 1,
expected: outMmappedChunk,
},
{
name: "call ix=3 on memSeries with 3 mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*4)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 3,
expected: outOpenHeadChunk,
},
{
name: "call ix=0 on memSeries with 3 mmapped chunks and no headChunk",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*4)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
s.headChunks = nil
},
inputID: 0,
expected: outMmappedChunk,
},
{
name: "call ix=2 on memSeries with 3 mmapped chunks and no headChunk",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*4)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
s.headChunks = nil
},
inputID: 2,
expected: outMmappedChunk,
},
{
name: "call ix=3 on memSeries with 3 mmapped chunks and no headChunk",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*4)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
s.headChunks = nil
},
inputID: 3,
expected: outErr,
},
{
name: "call ix=1 on memSeries with 3 mmapped chunks and closed ChunkDiskMapper",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*4)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
cdm.Close()
},
inputID: 1,
expected: outErr,
},
{
name: "call ix=3 on memSeries with 3 mmapped chunks and closed ChunkDiskMapper",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*4)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
cdm.Close()
},
inputID: 3,
expected: outOpenHeadChunk,
},
{
name: "call ix=0 on memSeries with 3 head chunks and no mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*3, cdm)
require.Empty(t, s.mmappedChunks, "wrong number of mmappedChunks")
require.Equal(t, 3, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, int64(0), s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*3)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 0,
expected: outClosedHeadChunk,
},
{
name: "call ix=1 on memSeries with 3 head chunks and no mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*3, cdm)
require.Empty(t, s.mmappedChunks, "wrong number of mmappedChunks")
require.Equal(t, 3, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, int64(0), s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*3)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 1,
expected: outClosedHeadChunk,
},
{
name: "call ix=10 on memSeries with 3 head chunks and no mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*3, cdm)
require.Empty(t, s.mmappedChunks, "wrong number of mmappedChunks")
require.Equal(t, 3, s.headChunks.len(), "wrong number of headChunks")
require.Equal(t, int64(0), s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*3)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 10,
expected: outErr,
},
{
name: "call ix=0 on memSeries with 3 head chunks and 3 mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
appendSamples(t, s, chunkRange*4, chunkRange*6, cdm)
require.Equal(t, 3, s.headChunks.len(), "wrong number of headChunks")
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*6)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 0,
expected: outMmappedChunk,
},
{
name: "call ix=2 on memSeries with 3 head chunks and 3 mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
appendSamples(t, s, chunkRange*4, chunkRange*6, cdm)
require.Equal(t, 3, s.headChunks.len(), "wrong number of headChunks")
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*6)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 2,
expected: outMmappedChunk,
},
{
name: "call ix=3 on memSeries with 3 head chunks and 3 mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
appendSamples(t, s, chunkRange*4, chunkRange*6, cdm)
require.Equal(t, 3, s.headChunks.len(), "wrong number of headChunks")
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*6)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 3,
expected: outClosedHeadChunk,
},
{
name: "call ix=5 on memSeries with 3 head chunks and 3 mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
appendSamples(t, s, chunkRange*4, chunkRange*6, cdm)
require.Equal(t, 3, s.headChunks.len(), "wrong number of headChunks")
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*6)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 5,
expected: outOpenHeadChunk,
},
{
name: "call ix=6 on memSeries with 3 head chunks and 3 mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
appendSamples(t, s, chunkRange*4, chunkRange*6, cdm)
require.Equal(t, 3, s.headChunks.len(), "wrong number of headChunks")
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*6)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 6,
expected: outErr,
},
{
name: "call ix=10 on memSeries with 3 head chunks and 3 mmapped chunks",
setup: func(t *testing.T, s *memSeries, cdm *chunks.ChunkDiskMapper) {
appendSamples(t, s, 0, chunkRange*4, cdm)
s.mmapChunks(cdm)
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, 1, s.headChunks.len(), "wrong number of headChunks")
appendSamples(t, s, chunkRange*4, chunkRange*6, cdm)
require.Equal(t, 3, s.headChunks.len(), "wrong number of headChunks")
require.Len(t, s.mmappedChunks, 3, "wrong number of mmappedChunks")
require.Equal(t, chunkRange*3, s.headChunks.oldest().minTime, "wrong minTime on last headChunks element")
require.Equal(t, (chunkRange*6)-chunkStep, s.headChunks.maxTime, "wrong maxTime on first headChunks element")
},
inputID: 10,
expected: outErr,
},
}
memChunkPool := &sync.Pool{
New: func() any {
return &memChunk{}
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
dir := t.TempDir()
chunkDiskMapper, err := chunks.NewChunkDiskMapper(nil, dir, chunkenc.NewPool(), chunks.DefaultWriteBufferSize, chunks.DefaultWriteQueueSize)
require.NoError(t, err)
defer func() {
require.NoError(t, chunkDiskMapper.Close())
}()
series := newMemSeries(labels.EmptyLabels(), 1, 0, true, false)
if tc.setup != nil {
tc.setup(t, series, chunkDiskMapper)
}
chk, headChunk, isOpen, err := series.chunk(tc.inputID, chunkDiskMapper, memChunkPool)
switch tc.expected {
case outOpenHeadChunk:
require.NoError(t, err, "unexpected error")
require.True(t, headChunk, "expected a chunk with headChunk=true but got headChunk=%v", headChunk)
require.True(t, isOpen, "expected a chunk with isOpen=true but got isOpen=%v", isOpen)
case outClosedHeadChunk:
require.NoError(t, err, "unexpected error")
require.True(t, headChunk, "expected a chunk with headChunk=true but got headChunk=%v", headChunk)
require.False(t, isOpen, "expected a chunk with isOpen=false but got isOpen=%v", isOpen)
case outMmappedChunk:
require.NoError(t, err, "unexpected error")
require.False(t, headChunk, "expected a chunk with headChunk=false but got gc=%v", headChunk)
case outErr:
require.Nil(t, chk, "got a non-nil chunk reference returned with an error")
require.Error(t, err)
}
})
}
}
func TestHeadIndexReader_PostingsForLabelMatching(t *testing.T) {
testPostingsForLabelMatching(t, 0, func(t *testing.T, series []labels.Labels) IndexReader {
opts := DefaultHeadOptions()
opts.ChunkRange = 1000
opts.ChunkDirRoot = t.TempDir()
h, err := NewHead(nil, nil, nil, nil, opts, nil)
require.NoError(t, err)
t.Cleanup(func() {
require.NoError(t, h.Close())
})
app := h.Appender(context.Background())
for _, s := range series {
app.Append(0, s, 0, 0)
}
require.NoError(t, app.Commit())
ir, err := h.Index()
require.NoError(t, err)
return ir
})
}
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