prometheus/pkg/textparse/parse_test.go

247 lines
5.5 KiB
Go

// Copyright 2017 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 textparse
import (
"bytes"
"compress/gzip"
"io"
"io/ioutil"
"os"
"testing"
"github.com/prometheus/common/expfmt"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/stretchr/testify/require"
)
func TestParse(t *testing.T) {
input := `# HELP go_gc_duration_seconds A summary of the GC invocation durations.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 4.9351e-05
go_gc_duration_seconds{quantile="0.25"} 7.424100000000001e-05
go_gc_duration_seconds{quantile="0.5",a="b"} 8.3835e-05
go_gc_duration_seconds_count 99
# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 33 123123`
int64p := func(x int64) *int64 { return &x }
exp := []struct {
lset labels.Labels
m string
t *int64
v float64
}{
{
m: `go_gc_duration_seconds{quantile="0"}`,
v: 4.9351e-05,
lset: labels.FromStrings("__name__", "go_gc_duration_seconds", "quantile", "0"),
}, {
m: `go_gc_duration_seconds{quantile="0.25"}`,
v: 7.424100000000001e-05,
lset: labels.FromStrings("__name__", "go_gc_duration_seconds", "quantile", "0.25"),
}, {
m: `go_gc_duration_seconds{quantile="0.5",a="b"}`,
v: 8.3835e-05,
lset: labels.FromStrings("__name__", "go_gc_duration_seconds", "quantile", "0.5", "a", "b"),
}, {
m: `go_gc_duration_seconds_count`,
v: 99,
lset: labels.FromStrings("__name__", "go_gc_duration_seconds_count"),
}, {
m: `go_goroutines`,
v: 33,
t: int64p(123123),
lset: labels.FromStrings("__name__", "go_goroutines"),
},
}
p := New([]byte(input))
i := 0
var res labels.Labels
for p.Next() {
m, ts, v := p.At()
p.Metric(&res)
require.Equal(t, exp[i].m, string(m))
require.Equal(t, exp[i].t, ts)
require.Equal(t, exp[i].v, v)
require.Equal(t, exp[i].lset, res)
i++
res = res[:0]
}
require.NoError(t, p.Err())
require.Equal(t, len(exp), i)
}
const (
testdataSampleCount = 410
)
func BenchmarkParse(b *testing.B) {
for _, fn := range []string{"testdata.txt", "testdata.nometa.txt"} {
f, err := os.Open(fn)
require.NoError(b, err)
defer f.Close()
buf, err := ioutil.ReadAll(f)
require.NoError(b, err)
b.Run("no-decode-metric/"+fn, func(b *testing.B) {
total := 0
b.SetBytes(int64(len(buf) * (b.N / testdataSampleCount)))
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i += testdataSampleCount {
p := New(buf)
for p.Next() && i < b.N {
m, _, _ := p.At()
total += len(m)
i++
}
require.NoError(b, p.Err())
}
_ = total
})
b.Run("decode-metric/"+fn, func(b *testing.B) {
total := 0
b.SetBytes(int64(len(buf) * (b.N / testdataSampleCount)))
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i += testdataSampleCount {
p := New(buf)
for p.Next() && i < b.N {
m, _, _ := p.At()
res := make(labels.Labels, 0, 5)
p.Metric(&res)
total += len(m)
i++
}
require.NoError(b, p.Err())
}
_ = total
})
b.Run("decode-metric-reuse/"+fn, func(b *testing.B) {
total := 0
res := make(labels.Labels, 0, 5)
b.SetBytes(int64(len(buf) * (b.N / testdataSampleCount)))
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i += testdataSampleCount {
p := New(buf)
for p.Next() && i < b.N {
m, _, _ := p.At()
p.Metric(&res)
total += len(m)
i++
res = res[:0]
}
require.NoError(b, p.Err())
}
_ = total
})
b.Run("expfmt-text/"+fn, func(b *testing.B) {
b.SetBytes(int64(len(buf) * (b.N / testdataSampleCount)))
b.ReportAllocs()
b.ResetTimer()
total := 0
for i := 0; i < b.N; i += testdataSampleCount {
var (
decSamples = make(model.Vector, 0, 50)
)
sdec := expfmt.SampleDecoder{
Dec: expfmt.NewDecoder(bytes.NewReader(buf), expfmt.FmtText),
Opts: &expfmt.DecodeOptions{
Timestamp: model.TimeFromUnixNano(0),
},
}
for {
if err = sdec.Decode(&decSamples); err != nil {
break
}
total += len(decSamples)
decSamples = decSamples[:0]
}
}
_ = total
})
}
}
func BenchmarkGzip(b *testing.B) {
for _, fn := range []string{"testdata.txt", "testdata.nometa.txt"} {
b.Run(fn, func(b *testing.B) {
f, err := os.Open(fn)
require.NoError(b, err)
defer f.Close()
var buf bytes.Buffer
gw := gzip.NewWriter(&buf)
n, err := io.Copy(gw, f)
require.NoError(b, err)
require.NoError(b, gw.Close())
gbuf, err := ioutil.ReadAll(&buf)
require.NoError(b, err)
k := b.N / testdataSampleCount
b.ReportAllocs()
b.SetBytes(int64(k) * int64(n))
b.ResetTimer()
total := 0
for i := 0; i < k; i++ {
gr, err := gzip.NewReader(bytes.NewReader(gbuf))
require.NoError(b, err)
d, err := ioutil.ReadAll(gr)
require.NoError(b, err)
require.NoError(b, gr.Close())
total += len(d)
}
_ = total
})
}
}