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feat: ProtobufParse.formatOpenMetricsFloat: improve float formatting by using strconv.AppendFloat instead of fmt.Sprint

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Signed-off-by: machine424 <ayoubmrini424@gmail.com>
This commit is contained in:
machine424 2024-10-15 17:28:56 +02:00
parent d4b1f9eb33
commit 18b81ad79d
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GPG key ID: A4B001A4FDEE017D
2 changed files with 182 additions and 4 deletions
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23
model/textparse/protobufparse.go
View file

@ -20,7 +20,9 @@ import (
"fmt"
"io"
"math"
"strconv"
"strings"
"sync"
"unicode/utf8"
"github.com/gogo/protobuf/proto"
@ -34,6 +36,15 @@ import (
dto "github.com/prometheus/prometheus/prompb/io/prometheus/client"
)
// floatFormatBufPool is exclusively used in formatOpenMetricsFloat.
var floatFormatBufPool = sync.Pool{
New: func() interface{} {
// To contain at most 17 digits and additional syntax for a float64.
b := make([]byte, 0, 24)
return &b
},
}
// ProtobufParser is a very inefficient way of unmarshaling the old Prometheus
// protobuf format and then present it as it if were parsed by a
// Prometheus-2-style text parser. This is only done so that we can easily plug
@ -629,11 +640,15 @@ func formatOpenMetricsFloat(f float64) string {
case math.IsInf(f, -1):
return "-Inf"
}
s := fmt.Sprint(f)
if strings.ContainsAny(s, "e.") {
return s
bp := floatFormatBufPool.Get().(*[]byte)
defer floatFormatBufPool.Put(bp)
*bp = strconv.AppendFloat((*bp)[:0], f, 'g', -1, 64)
if bytes.ContainsAny(*bp, "e.") {
return string(*bp)
}
return s + ".0"
*bp = append(*bp, '.', '0')
return string(*bp)
}
// isNativeHistogram returns false iff the provided histograms has no spans at

163
model/textparse/protobufparse_test.go
View file

@ -409,6 +409,49 @@ metric: <
>
>
`,
`name: "test_histogram3"
help: "Similar histogram as before but now with integer buckets."
type: HISTOGRAM
metric: <
histogram: <
sample_count: 6
sample_sum: 50
bucket: <
cumulative_count: 2
upper_bound: -20
>
bucket: <
cumulative_count: 4
upper_bound: 20
exemplar: <
label: <
name: "dummyID"
value: "59727"
>
value: 15
timestamp: <
seconds: 1625851153
nanos: 146848499
>
>
>
bucket: <
cumulative_count: 6
upper_bound: 30
exemplar: <
label: <
name: "dummyID"
value: "5617"
>
value: 25
>
>
schema: 0
zero_threshold: 0
>
>
`,
`name: "test_histogram_family"
help: "Test histogram metric family with two very simple histograms."
@ -1050,6 +1093,66 @@ func TestProtobufParse(t *testing.T) {
"le", "+Inf",
),
},
{
m: "test_histogram3",
help: "Similar histogram as before but now with integer buckets.",
},
{
m: "test_histogram3",
typ: model.MetricTypeHistogram,
},
{
m: "test_histogram3_count",
v: 6,
lset: labels.FromStrings(
"__name__", "test_histogram3_count",
),
},
{
m: "test_histogram3_sum",
v: 50,
lset: labels.FromStrings(
"__name__", "test_histogram3_sum",
),
},
{
m: "test_histogram3_bucket\xffle\xff-20.0",
v: 2,
lset: labels.FromStrings(
"__name__", "test_histogram3_bucket",
"le", "-20.0",
),
},
{
m: "test_histogram3_bucket\xffle\xff20.0",
v: 4,
lset: labels.FromStrings(
"__name__", "test_histogram3_bucket",
"le", "20.0",
),
es: []exemplar.Exemplar{
{Labels: labels.FromStrings("dummyID", "59727"), Value: 15, HasTs: true, Ts: 1625851153146},
},
},
{
m: "test_histogram3_bucket\xffle\xff30.0",
v: 6,
lset: labels.FromStrings(
"__name__", "test_histogram3_bucket",
"le", "30.0",
),
es: []exemplar.Exemplar{
{Labels: labels.FromStrings("dummyID", "5617"), Value: 25, HasTs: false},
},
},
{
m: "test_histogram3_bucket\xffle\xff+Inf",
v: 6,
lset: labels.FromStrings(
"__name__", "test_histogram3_bucket",
"le", "+Inf",
),
},
{
m: "test_histogram_family",
help: "Test histogram metric family with two very simple histograms.",
@ -1857,6 +1960,66 @@ func TestProtobufParse(t *testing.T) {
"le", "+Inf",
),
},
{
m: "test_histogram3",
help: "Similar histogram as before but now with integer buckets.",
},
{
m: "test_histogram3",
typ: model.MetricTypeHistogram,
},
{
m: "test_histogram3_count",
v: 6,
lset: labels.FromStrings(
"__name__", "test_histogram3_count",
),
},
{
m: "test_histogram3_sum",
v: 50,
lset: labels.FromStrings(
"__name__", "test_histogram3_sum",
),
},
{
m: "test_histogram3_bucket\xffle\xff-20.0",
v: 2,
lset: labels.FromStrings(
"__name__", "test_histogram3_bucket",
"le", "-20.0",
),
},
{
m: "test_histogram3_bucket\xffle\xff20.0",
v: 4,
lset: labels.FromStrings(
"__name__", "test_histogram3_bucket",
"le", "20.0",
),
es: []exemplar.Exemplar{
{Labels: labels.FromStrings("dummyID", "59727"), Value: 15, HasTs: true, Ts: 1625851153146},
},
},
{
m: "test_histogram3_bucket\xffle\xff30.0",
v: 6,
lset: labels.FromStrings(
"__name__", "test_histogram3_bucket",
"le", "30.0",
),
es: []exemplar.Exemplar{
{Labels: labels.FromStrings("dummyID", "5617"), Value: 25, HasTs: false},
},
},
{
m: "test_histogram3_bucket\xffle\xff+Inf",
v: 6,
lset: labels.FromStrings(
"__name__", "test_histogram3_bucket",
"le", "+Inf",
),
},
{
m: "test_histogram_family",
help: "Test histogram metric family with two very simple histograms.",