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lib/promrelabel: allows regex capture groups in target_label like Prometheus does

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Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/569
This commit is contained in:
Aliaksandr Valialkin 2020-06-19 02:20:29 +03:00
parent ac3700ed1e
commit 5820c0ffb7
5 changed files with 160 additions and 103 deletions
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4
lib/promrelabel/config.go
View file

@ -4,6 +4,7 @@ import (
"fmt"
"io/ioutil"
"regexp"
"strings"
"gopkg.in/yaml.v2"
)
@ -124,6 +125,9 @@ func parseRelabelConfig(dst []ParsedRelabelConfig, rc *RelabelConfig) ([]ParsedR
Modulus: modulus,
Replacement: replacement,
Action: action,
hasCaptureGroupInTargetLabel: strings.Contains(targetLabel, "$"),
hasCaptureGroupInReplacement: strings.Contains(replacement, "$"),
})
return dst, nil
}

2
lib/promrelabel/config_test.go
View file

@ -60,6 +60,8 @@ func TestParseRelabelConfigsSuccess(t *testing.T) {
Regex: defaultRegexForRelabelConfig,
Replacement: "$1",
Action: "replace",
hasCaptureGroupInReplacement: true,
},
})
}

76
lib/promrelabel/relabel.go
View file

@ -23,6 +23,9 @@ type ParsedRelabelConfig struct {
Modulus uint64
Replacement string
Action string
hasCaptureGroupInTargetLabel bool
hasCaptureGroupInReplacement bool
}
// String returns human-readable representation for prc.
@ -103,51 +106,52 @@ func FinalizeLabels(dst, src []prompbmarshal.Label) []prompbmarshal.Label {
return dst
}
// applyRelabelConfig applies relabeling according to cfg.
// applyRelabelConfig applies relabeling according to prc.
//
// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config
func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, cfg *ParsedRelabelConfig) []prompbmarshal.Label {
func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, prc *ParsedRelabelConfig) []prompbmarshal.Label {
src := labels[labelsOffset:]
switch cfg.Action {
switch prc.Action {
case "replace":
bb := relabelBufPool.Get()
bb.B = concatLabelValues(bb.B[:0], src, cfg.SourceLabels, cfg.Separator)
if len(bb.B) == 0 && cfg.Regex == defaultRegexForRelabelConfig && !strings.Contains(cfg.Replacement, "$") {
bb.B = concatLabelValues(bb.B[:0], src, prc.SourceLabels, prc.Separator)
if len(bb.B) == 0 && prc.Regex == defaultRegexForRelabelConfig && !prc.hasCaptureGroupInReplacement && !prc.hasCaptureGroupInTargetLabel {
// Fast path for the following rule that just sets label value:
// - target_label: foobar
// replacement: something-here
relabelBufPool.Put(bb)
return setLabelValue(labels, labelsOffset, cfg.TargetLabel, cfg.Replacement)
return setLabelValue(labels, labelsOffset, prc.TargetLabel, prc.Replacement)
}
match := cfg.Regex.FindSubmatchIndex(bb.B)
match := prc.Regex.FindSubmatchIndex(bb.B)
if match == nil {
// Fast path - nothing to replace.
relabelBufPool.Put(bb)
return labels
}
sourceStr := bytesutil.ToUnsafeString(bb.B)
value := relabelBufPool.Get()
value.B = cfg.Regex.ExpandString(value.B[:0], cfg.Replacement, sourceStr, match)
nameStr := prc.TargetLabel
if prc.hasCaptureGroupInTargetLabel {
nameStr = prc.expandCaptureGroups(nameStr, sourceStr, match)
}
valueStr := prc.expandCaptureGroups(prc.Replacement, sourceStr, match)
relabelBufPool.Put(bb)
valueStr := string(value.B)
relabelBufPool.Put(value)
return setLabelValue(labels, labelsOffset, cfg.TargetLabel, valueStr)
return setLabelValue(labels, labelsOffset, nameStr, valueStr)
case "replace_all":
bb := relabelBufPool.Get()
bb.B = concatLabelValues(bb.B[:0], src, cfg.SourceLabels, cfg.Separator)
if !cfg.Regex.Match(bb.B) {
bb.B = concatLabelValues(bb.B[:0], src, prc.SourceLabels, prc.Separator)
if !prc.Regex.Match(bb.B) {
// Fast path - nothing to replace.
relabelBufPool.Put(bb)
return labels
}
sourceStr := string(bb.B) // Make a copy of bb, since it can be returned from ReplaceAllString
relabelBufPool.Put(bb)
valueStr := cfg.Regex.ReplaceAllString(sourceStr, cfg.Replacement)
return setLabelValue(labels, labelsOffset, cfg.TargetLabel, valueStr)
valueStr := prc.Regex.ReplaceAllString(sourceStr, prc.Replacement)
return setLabelValue(labels, labelsOffset, prc.TargetLabel, valueStr)
case "keep":
bb := relabelBufPool.Get()
bb.B = concatLabelValues(bb.B[:0], src, cfg.SourceLabels, cfg.Separator)
keep := cfg.Regex.Match(bb.B)
bb.B = concatLabelValues(bb.B[:0], src, prc.SourceLabels, prc.Separator)
keep := prc.Regex.Match(bb.B)
relabelBufPool.Put(bb)
if !keep {
return labels[:labelsOffset]
@ -155,8 +159,8 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, cfg *Par
return labels
case "drop":
bb := relabelBufPool.Get()
bb.B = concatLabelValues(bb.B[:0], src, cfg.SourceLabels, cfg.Separator)
drop := cfg.Regex.Match(bb.B)
bb.B = concatLabelValues(bb.B[:0], src, prc.SourceLabels, prc.Separator)
drop := prc.Regex.Match(bb.B)
relabelBufPool.Put(bb)
if drop {
return labels[:labelsOffset]
@ -164,20 +168,20 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, cfg *Par
return labels
case "hashmod":
bb := relabelBufPool.Get()
bb.B = concatLabelValues(bb.B[:0], src, cfg.SourceLabels, cfg.Separator)
h := xxhash.Sum64(bb.B) % cfg.Modulus
bb.B = concatLabelValues(bb.B[:0], src, prc.SourceLabels, prc.Separator)
h := xxhash.Sum64(bb.B) % prc.Modulus
value := strconv.Itoa(int(h))
relabelBufPool.Put(bb)
return setLabelValue(labels, labelsOffset, cfg.TargetLabel, value)
return setLabelValue(labels, labelsOffset, prc.TargetLabel, value)
case "labelmap":
for i := range src {
label := &src[i]
match := cfg.Regex.FindStringSubmatchIndex(label.Name)
match := prc.Regex.FindStringSubmatchIndex(label.Name)
if match == nil {
continue
}
value := relabelBufPool.Get()
value.B = cfg.Regex.ExpandString(value.B[:0], cfg.Replacement, label.Name, match)
value.B = prc.Regex.ExpandString(value.B[:0], prc.Replacement, label.Name, match)
label.Name = string(value.B)
relabelBufPool.Put(value)
}
@ -185,16 +189,16 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, cfg *Par
case "labelmap_all":
for i := range src {
label := &src[i]
if !cfg.Regex.MatchString(label.Name) {
if !prc.Regex.MatchString(label.Name) {
continue
}
label.Name = cfg.Regex.ReplaceAllString(label.Name, cfg.Replacement)
label.Name = prc.Regex.ReplaceAllString(label.Name, prc.Replacement)
}
return labels
case "labeldrop":
keepSrc := true
for i := range src {
if cfg.Regex.MatchString(src[i].Name) {
if prc.Regex.MatchString(src[i].Name) {
keepSrc = false
break
}
@ -205,7 +209,7 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, cfg *Par
dst := labels[:labelsOffset]
for i := range src {
label := &src[i]
if !cfg.Regex.MatchString(label.Name) {
if !prc.Regex.MatchString(label.Name) {
dst = append(dst, *label)
}
}
@ -213,7 +217,7 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, cfg *Par
case "labelkeep":
keepSrc := true
for i := range src {
if !cfg.Regex.MatchString(src[i].Name) {
if !prc.Regex.MatchString(src[i].Name) {
keepSrc = false
break
}
@ -224,17 +228,25 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, cfg *Par
dst := labels[:labelsOffset]
for i := range src {
label := &src[i]
if cfg.Regex.MatchString(label.Name) {
if prc.Regex.MatchString(label.Name) {
dst = append(dst, *label)
}
}
return dst
default:
logger.Panicf("BUG: unknown `action`: %q", cfg.Action)
logger.Panicf("BUG: unknown `action`: %q", prc.Action)
return labels
}
}
func (prc *ParsedRelabelConfig) expandCaptureGroups(template, source string, match []int) string {
bb := relabelBufPool.Get()
bb.B = prc.Regex.ExpandString(bb.B[:0], template, source, match)
s := string(bb.B)
relabelBufPool.Put(bb)
return s
}
var relabelBufPool bytesutil.ByteBufferPool
func concatLabelValues(dst []byte, labels []prompbmarshal.Label, labelNames []string, separator string) []byte {

40
lib/promrelabel/relabel_test.go
View file

@ -61,6 +61,7 @@ func TestApplyRelabelConfigs(t *testing.T) {
TargetLabel: "bar",
Regex: defaultRegexForRelabelConfig,
Replacement: "$1",
hasCaptureGroupInReplacement: true,
},
}, nil, false, []prompbmarshal.Label{})
f([]ParsedRelabelConfig{
@ -70,6 +71,7 @@ func TestApplyRelabelConfigs(t *testing.T) {
TargetLabel: "bar",
Regex: defaultRegexForRelabelConfig,
Replacement: "$1",
hasCaptureGroupInReplacement: true,
},
}, nil, false, []prompbmarshal.Label{})
f([]ParsedRelabelConfig{
@ -79,6 +81,7 @@ func TestApplyRelabelConfigs(t *testing.T) {
TargetLabel: "bar",
Regex: defaultRegexForRelabelConfig,
Replacement: "$1",
hasCaptureGroupInReplacement: true,
},
}, []prompbmarshal.Label{
{
@ -98,6 +101,7 @@ func TestApplyRelabelConfigs(t *testing.T) {
TargetLabel: "bar",
Regex: regexp.MustCompile(".+"),
Replacement: "$1",
hasCaptureGroupInReplacement: true,
},
}, []prompbmarshal.Label{
{
@ -120,6 +124,7 @@ func TestApplyRelabelConfigs(t *testing.T) {
TargetLabel: "bar",
Regex: defaultRegexForRelabelConfig,
Replacement: "a-$1-b",
hasCaptureGroupInReplacement: true,
},
}, []prompbmarshal.Label{
{
@ -137,6 +142,34 @@ func TestApplyRelabelConfigs(t *testing.T) {
},
})
})
t.Run("replace-hit-target-label-with-capture-group", func(t *testing.T) {
f([]ParsedRelabelConfig{
{
Action: "replace",
SourceLabels: []string{"xxx", "foo"},
Separator: ";",
TargetLabel: "bar-$1",
Regex: defaultRegexForRelabelConfig,
Replacement: "a-$1-b",
hasCaptureGroupInTargetLabel: true,
hasCaptureGroupInReplacement: true,
},
}, []prompbmarshal.Label{
{
Name: "xxx",
Value: "yyy",
},
}, false, []prompbmarshal.Label{
{
Name: "bar-yyy;",
Value: "a-yyy;-b",
},
{
Name: "xxx",
Value: "yyy",
},
})
})
t.Run("replace_all-miss", func(t *testing.T) {
f([]ParsedRelabelConfig{
{
@ -144,6 +177,7 @@ func TestApplyRelabelConfigs(t *testing.T) {
TargetLabel: "bar",
Regex: defaultRegexForRelabelConfig,
Replacement: "$1",
hasCaptureGroupInReplacement: true,
},
}, nil, false, []prompbmarshal.Label{})
f([]ParsedRelabelConfig{
@ -153,6 +187,7 @@ func TestApplyRelabelConfigs(t *testing.T) {
TargetLabel: "bar",
Regex: defaultRegexForRelabelConfig,
Replacement: "$1",
hasCaptureGroupInReplacement: true,
},
}, nil, false, []prompbmarshal.Label{})
f([]ParsedRelabelConfig{
@ -162,6 +197,7 @@ func TestApplyRelabelConfigs(t *testing.T) {
TargetLabel: "bar",
Regex: defaultRegexForRelabelConfig,
Replacement: "$1",
hasCaptureGroupInReplacement: true,
},
}, []prompbmarshal.Label{
{
@ -181,6 +217,7 @@ func TestApplyRelabelConfigs(t *testing.T) {
TargetLabel: "bar",
Regex: regexp.MustCompile(".+"),
Replacement: "$1",
hasCaptureGroupInReplacement: true,
},
}, []prompbmarshal.Label{
{
@ -203,6 +240,7 @@ func TestApplyRelabelConfigs(t *testing.T) {
TargetLabel: "xxx",
Regex: regexp.MustCompile("(;)"),
Replacement: "-$1-",
hasCaptureGroupInReplacement: true,
},
}, []prompbmarshal.Label{
{
@ -224,6 +262,7 @@ func TestApplyRelabelConfigs(t *testing.T) {
TargetLabel: "bar",
Regex: defaultRegexForRelabelConfig,
Replacement: "a-$1",
hasCaptureGroupInReplacement: true,
},
{
Action: "replace",
@ -268,6 +307,7 @@ func TestApplyRelabelConfigs(t *testing.T) {
TargetLabel: "foo",
Regex: defaultRegexForRelabelConfig,
Replacement: "a-$1",
hasCaptureGroupInReplacement: true,
},
}, []prompbmarshal.Label{
{

19
lib/promscrape/config_test.go
View file

@ -952,6 +952,14 @@ scrape_configs:
AuthConfig: &promauth.Config{},
},
})
prcs, err := promrelabel.ParseRelabelConfigs(nil, []promrelabel.RelabelConfig{{
SourceLabels: []string{"foo"},
TargetLabel: "abc",
}})
if err != nil {
t.Fatalf("unexpected error when parsing relabel configs: %s", err)
}
f(`
scrape_configs:
- job_name: foo
@ -988,16 +996,7 @@ scrape_configs:
},
},
AuthConfig: &promauth.Config{},
MetricRelabelConfigs: []promrelabel.ParsedRelabelConfig{
{
SourceLabels: []string{"foo"},
Separator: ";",
TargetLabel: "abc",
Regex: defaultRegexForRelabelConfig,
Replacement: "$1",
Action: "replace",
},
},
MetricRelabelConfigs: prcs,
},
})
f(`