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prometheus/model/relabel/relabel_test.go
Bryan Boreham 0289dd6157 relabel: blank replacement deletes label post-regexp 
If `cfg.TargetLabel` is a template like `$1`, it won't match any labels,
so no point calling `lb.Del` with it.

Similarly if `target` is not a valid label name, it won't match any
labels, so don't call with that either.

The intention seems to have been that a blank _value_ would delete the
target, so change that code to use `target` instead of `cfg.TargetLabel`.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
2023-12-18 16:39:01 +00:00

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// Copyright 2015 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 relabel
import (
"fmt"
"testing"
"github.com/prometheus/common/model"
"github.com/stretchr/testify/require"
"gopkg.in/yaml.v2"
"github.com/prometheus/prometheus/model/labels"
)
func TestRelabel(t *testing.T) {
tests := []struct {
input labels.Labels
relabel []*Config
output labels.Labels
drop bool
}{
{
input: labels.FromMap(map[string]string{
"a": "foo",
"b": "bar",
"c": "baz",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("f(.*)"),
TargetLabel: "d",
Separator: ";",
Replacement: "ch${1}-ch${1}",
Action: Replace,
},
},
output: labels.FromMap(map[string]string{
"a": "foo",
"b": "bar",
"c": "baz",
"d": "choo-choo",
}),
},
{
input: labels.FromMap(map[string]string{
"a": "foo",
"b": "bar",
"c": "baz",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a", "b"},
Regex: MustNewRegexp("f(.*);(.*)r"),
TargetLabel: "a",
Separator: ";",
Replacement: "b${1}${2}m", // boobam
Action: Replace,
},
{
SourceLabels: model.LabelNames{"c", "a"},
Regex: MustNewRegexp("(b).*b(.*)ba(.*)"),
TargetLabel: "d",
Separator: ";",
Replacement: "$1$2$2$3",
Action: Replace,
},
},
output: labels.FromMap(map[string]string{
"a": "boobam",
"b": "bar",
"c": "baz",
"d": "boooom",
}),
},
{
input: labels.FromMap(map[string]string{
"a": "foo",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp(".*o.*"),
Action: Drop,
}, {
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("f(.*)"),
TargetLabel: "d",
Separator: ";",
Replacement: "ch$1-ch$1",
Action: Replace,
},
},
drop: true,
},
{
input: labels.FromMap(map[string]string{
"a": "foo",
"b": "bar",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp(".*o.*"),
Action: Drop,
},
},
drop: true,
},
{
input: labels.FromMap(map[string]string{
"a": "abc",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp(".*(b).*"),
TargetLabel: "d",
Separator: ";",
Replacement: "$1",
Action: Replace,
},
},
output: labels.FromMap(map[string]string{
"a": "abc",
"d": "b",
}),
},
{
input: labels.FromMap(map[string]string{
"a": "foo",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("no-match"),
Action: Drop,
},
},
output: labels.FromMap(map[string]string{
"a": "foo",
}),
},
{
input: labels.FromMap(map[string]string{
"a": "foo",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("f|o"),
Action: Drop,
},
},
output: labels.FromMap(map[string]string{
"a": "foo",
}),
},
{
input: labels.FromMap(map[string]string{
"a": "foo",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("no-match"),
Action: Keep,
},
},
drop: true,
},
{
input: labels.FromMap(map[string]string{
"a": "foo",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("f.*"),
Action: Keep,
},
},
output: labels.FromMap(map[string]string{
"a": "foo",
}),
},
{
// No replacement must be applied if there is no match.
input: labels.FromMap(map[string]string{
"a": "boo",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("f"),
TargetLabel: "b",
Replacement: "bar",
Action: Replace,
},
},
output: labels.FromMap(map[string]string{
"a": "boo",
}),
},
{
// Blank replacement should delete the label.
input: labels.FromMap(map[string]string{
"a": "foo",
"f": "baz",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("(f).*"),
TargetLabel: "$1",
Replacement: "$2",
Action: Replace,
},
},
output: labels.FromMap(map[string]string{
"a": "foo",
}),
},
{
input: labels.FromMap(map[string]string{
"a": "foo",
"b": "bar",
"c": "baz",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"c"},
TargetLabel: "d",
Separator: ";",
Action: HashMod,
Modulus: 1000,
},
},
output: labels.FromMap(map[string]string{
"a": "foo",
"b": "bar",
"c": "baz",
"d": "976",
}),
},
{
input: labels.FromMap(map[string]string{
"a": "foo\nbar",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
TargetLabel: "b",
Separator: ";",
Action: HashMod,
Modulus: 1000,
},
},
output: labels.FromMap(map[string]string{
"a": "foo\nbar",
"b": "734",
}),
},
{
input: labels.FromMap(map[string]string{
"a": "foo",
"b1": "bar",
"b2": "baz",
}),
relabel: []*Config{
{
Regex: MustNewRegexp("(b.*)"),
Replacement: "bar_${1}",
Action: LabelMap,
},
},
output: labels.FromMap(map[string]string{
"a": "foo",
"b1": "bar",
"b2": "baz",
"bar_b1": "bar",
"bar_b2": "baz",
}),
},
{
input: labels.FromMap(map[string]string{
"a": "foo",
"__meta_my_bar": "aaa",
"__meta_my_baz": "bbb",
"__meta_other": "ccc",
}),
relabel: []*Config{
{
Regex: MustNewRegexp("__meta_(my.*)"),
Replacement: "${1}",
Action: LabelMap,
},
},
output: labels.FromMap(map[string]string{
"a": "foo",
"__meta_my_bar": "aaa",
"__meta_my_baz": "bbb",
"__meta_other": "ccc",
"my_bar": "aaa",
"my_baz": "bbb",
}),
},
{ // valid case
input: labels.FromMap(map[string]string{
"a": "some-name-value",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("some-([^-]+)-([^,]+)"),
Action: Replace,
Replacement: "${2}",
TargetLabel: "${1}",
},
},
output: labels.FromMap(map[string]string{
"a": "some-name-value",
"name": "value",
}),
},
{ // invalid replacement ""
input: labels.FromMap(map[string]string{
"a": "some-name-value",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("some-([^-]+)-([^,]+)"),
Action: Replace,
Replacement: "${3}",
TargetLabel: "${1}",
},
},
output: labels.FromMap(map[string]string{
"a": "some-name-value",
}),
},
{ // invalid target_labels
input: labels.FromMap(map[string]string{
"a": "some-name-0",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("some-([^-]+)-([^,]+)"),
Action: Replace,
Replacement: "${1}",
TargetLabel: "${3}",
},
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("some-([^-]+)-([^,]+)"),
Action: Replace,
Replacement: "${1}",
TargetLabel: "${3}",
},
{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("some-([^-]+)(-[^,]+)"),
Action: Replace,
Replacement: "${1}",
TargetLabel: "${3}",
},
},
output: labels.FromMap(map[string]string{
"a": "some-name-0",
}),
},
{ // more complex real-life like usecase
input: labels.FromMap(map[string]string{
"__meta_sd_tags": "path:/secret,job:some-job,label:foo=bar",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"__meta_sd_tags"},
Regex: MustNewRegexp("(?:.+,|^)path:(/[^,]+).*"),
Action: Replace,
Replacement: "${1}",
TargetLabel: "__metrics_path__",
},
{
SourceLabels: model.LabelNames{"__meta_sd_tags"},
Regex: MustNewRegexp("(?:.+,|^)job:([^,]+).*"),
Action: Replace,
Replacement: "${1}",
TargetLabel: "job",
},
{
SourceLabels: model.LabelNames{"__meta_sd_tags"},
Regex: MustNewRegexp("(?:.+,|^)label:([^=]+)=([^,]+).*"),
Action: Replace,
Replacement: "${2}",
TargetLabel: "${1}",
},
},
output: labels.FromMap(map[string]string{
"__meta_sd_tags": "path:/secret,job:some-job,label:foo=bar",
"__metrics_path__": "/secret",
"job": "some-job",
"foo": "bar",
}),
},
{ // From https://github.com/prometheus/prometheus/issues/12283
input: labels.FromMap(map[string]string{
"__meta_kubernetes_pod_container_port_name": "foo",
"__meta_kubernetes_pod_annotation_XXX_metrics_port": "9091",
}),
relabel: []*Config{
{
Regex: MustNewRegexp("^__meta_kubernetes_pod_container_port_name$"),
Action: LabelDrop,
},
{
SourceLabels: model.LabelNames{"__meta_kubernetes_pod_annotation_XXX_metrics_port"},
Regex: MustNewRegexp("(.+)"),
Action: Replace,
Replacement: "metrics",
TargetLabel: "__meta_kubernetes_pod_container_port_name",
},
{
SourceLabels: model.LabelNames{"__meta_kubernetes_pod_container_port_name"},
Regex: MustNewRegexp("^metrics$"),
Action: Keep,
},
},
output: labels.FromMap(map[string]string{
"__meta_kubernetes_pod_annotation_XXX_metrics_port": "9091",
"__meta_kubernetes_pod_container_port_name": "metrics",
}),
},
{
input: labels.FromMap(map[string]string{
"a": "foo",
"b1": "bar",
"b2": "baz",
}),
relabel: []*Config{
{
Regex: MustNewRegexp("(b.*)"),
Action: LabelKeep,
},
},
output: labels.FromMap(map[string]string{
"b1": "bar",
"b2": "baz",
}),
},
{
input: labels.FromMap(map[string]string{
"a": "foo",
"b1": "bar",
"b2": "baz",
}),
relabel: []*Config{
{
Regex: MustNewRegexp("(b.*)"),
Action: LabelDrop,
},
},
output: labels.FromMap(map[string]string{
"a": "foo",
}),
},
{
input: labels.FromMap(map[string]string{
"foo": "bAr123Foo",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"foo"},
Action: Uppercase,
TargetLabel: "foo_uppercase",
},
{
SourceLabels: model.LabelNames{"foo"},
Action: Lowercase,
TargetLabel: "foo_lowercase",
},
},
output: labels.FromMap(map[string]string{
"foo": "bAr123Foo",
"foo_lowercase": "bar123foo",
"foo_uppercase": "BAR123FOO",
}),
},
{
input: labels.FromMap(map[string]string{
"__tmp_port": "1234",
"__port1": "1234",
"__port2": "5678",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"__tmp_port"},
Action: KeepEqual,
TargetLabel: "__port1",
},
},
output: labels.FromMap(map[string]string{
"__tmp_port": "1234",
"__port1": "1234",
"__port2": "5678",
}),
},
{
input: labels.FromMap(map[string]string{
"__tmp_port": "1234",
"__port1": "1234",
"__port2": "5678",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"__tmp_port"},
Action: DropEqual,
TargetLabel: "__port1",
},
},
drop: true,
},
{
input: labels.FromMap(map[string]string{
"__tmp_port": "1234",
"__port1": "1234",
"__port2": "5678",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"__tmp_port"},
Action: DropEqual,
TargetLabel: "__port2",
},
},
output: labels.FromMap(map[string]string{
"__tmp_port": "1234",
"__port1": "1234",
"__port2": "5678",
}),
},
{
input: labels.FromMap(map[string]string{
"__tmp_port": "1234",
"__port1": "1234",
"__port2": "5678",
}),
relabel: []*Config{
{
SourceLabels: model.LabelNames{"__tmp_port"},
Action: KeepEqual,
TargetLabel: "__port2",
},
},
drop: true,
},
}
for _, test := range tests {
// Setting default fields, mimicking the behaviour in Prometheus.
for _, cfg := range test.relabel {
if cfg.Action == "" {
cfg.Action = DefaultRelabelConfig.Action
}
if cfg.Separator == "" {
cfg.Separator = DefaultRelabelConfig.Separator
}
if cfg.Regex.Regexp == nil || cfg.Regex.String() == "" {
cfg.Regex = DefaultRelabelConfig.Regex
}
if cfg.Replacement == "" {
cfg.Replacement = DefaultRelabelConfig.Replacement
}
require.NoError(t, cfg.Validate())
}
res, keep := Process(test.input, test.relabel...)
require.Equal(t, !test.drop, keep)
if keep {
require.Equal(t, test.output, res)
}
}
}
func TestRelabelValidate(t *testing.T) {
tests := []struct {
config Config
expected string
}{
{
config: Config{},
expected: `relabel action cannot be empty`,
},
{
config: Config{
Action: Replace,
},
expected: `requires 'target_label' value`,
},
{
config: Config{
Action: Lowercase,
},
expected: `requires 'target_label' value`,
},
{
config: Config{
Action: Lowercase,
Replacement: DefaultRelabelConfig.Replacement,
TargetLabel: "${3}",
},
expected: `"${3}" is invalid 'target_label'`,
},
{
config: Config{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("some-([^-]+)-([^,]+)"),
Action: Replace,
Replacement: "${1}",
TargetLabel: "${3}",
},
},
{
config: Config{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("some-([^-]+)-([^,]+)"),
Action: Replace,
Replacement: "${1}",
TargetLabel: "0${3}",
},
expected: `"0${3}" is invalid 'target_label'`,
},
{
config: Config{
SourceLabels: model.LabelNames{"a"},
Regex: MustNewRegexp("some-([^-]+)-([^,]+)"),
Action: Replace,
Replacement: "${1}",
TargetLabel: "-${3}",
},
expected: `"-${3}" is invalid 'target_label' for replace action`,
},
}
for i, test := range tests {
t.Run(fmt.Sprint(i), func(t *testing.T) {
err := test.config.Validate()
if test.expected == "" {
require.NoError(t, err)
} else {
require.ErrorContains(t, err, test.expected)
}
})
}
}
func TestTargetLabelValidity(t *testing.T) {
tests := []struct {
str string
valid bool
}{
{"-label", false},
{"label", true},
{"label${1}", true},
{"${1}label", true},
{"${1}", true},
{"${1}label", true},
{"${", false},
{"$", false},
{"${}", false},
{"foo${", false},
{"$1", true},
{"asd$2asd", true},
{"-foo${1}bar-", false},
{"_${1}_", true},
{"foo${bar}foo", true},
}
for _, test := range tests {
require.Equal(t, test.valid, relabelTarget.Match([]byte(test.str)),
"Expected %q to be %v", test.str, test.valid)
}
}
func BenchmarkRelabel(b *testing.B) {
tests := []struct {
name string
lbls labels.Labels
config string
cfgs []*Config
}{
{
name: "example", // From prometheus/config/testdata/conf.good.yml.
config: `
- source_labels: [job, __meta_dns_name]
regex: "(.*)some-[regex]"
target_label: job
replacement: foo-${1}
# action defaults to 'replace'
- source_labels: [abc]
target_label: cde
- replacement: static
target_label: abc
- regex:
replacement: static
target_label: abc`,
lbls: labels.FromStrings("__meta_dns_name", "example-some-x.com", "abc", "def", "job", "foo"),
},
{
name: "kubernetes",
config: `
- source_labels:
- __meta_kubernetes_pod_container_port_name
regex: .*-metrics
action: keep
- source_labels:
- __meta_kubernetes_pod_label_name
action: drop
regex: ""
- source_labels:
- __meta_kubernetes_pod_phase
regex: Succeeded|Failed
action: drop
- source_labels:
- __meta_kubernetes_pod_annotation_prometheus_io_scrape
regex: "false"
action: drop
- source_labels:
- __meta_kubernetes_pod_annotation_prometheus_io_scheme
target_label: __scheme__
regex: (https?)
replacement: $1
action: replace
- source_labels:
- __meta_kubernetes_pod_annotation_prometheus_io_path
target_label: __metrics_path__
regex: (.+)
replacement: $1
action: replace
- source_labels:
- __address__
- __meta_kubernetes_pod_annotation_prometheus_io_port
target_label: __address__
regex: (.+?)(\:\d+)?;(\d+)
replacement: $1:$3
action: replace
- regex: __meta_kubernetes_pod_annotation_prometheus_io_param_(.+)
replacement: __param_$1
action: labelmap
- regex: __meta_kubernetes_pod_label_prometheus_io_label_(.+)
action: labelmap
- regex: __meta_kubernetes_pod_annotation_prometheus_io_label_(.+)
action: labelmap
- source_labels:
- __meta_kubernetes_namespace
- __meta_kubernetes_pod_label_name
separator: /
target_label: job
replacement: $1
action: replace
- source_labels:
- __meta_kubernetes_namespace
target_label: namespace
action: replace
- source_labels:
- __meta_kubernetes_pod_name
target_label: pod
action: replace
- source_labels:
- __meta_kubernetes_pod_container_name
target_label: container
action: replace
- source_labels:
- __meta_kubernetes_pod_name
- __meta_kubernetes_pod_container_name
- __meta_kubernetes_pod_container_port_name
separator: ':'
target_label: instance
action: replace
- target_label: cluster
replacement: dev-us-central-0
- source_labels:
- __meta_kubernetes_namespace
regex: hosted-grafana
action: drop
- source_labels:
- __address__
target_label: __tmp_hash
modulus: 3
action: hashmod
- source_labels:
- __tmp_hash
regex: ^0$
action: keep
- regex: __tmp_hash
action: labeldrop`,
lbls: labels.FromStrings(
"__address__", "10.132.183.40:80",
"__meta_kubernetes_namespace", "loki-boltdb-shipper",
"__meta_kubernetes_pod_annotation_promtail_loki_boltdb_shipper_hash", "50523b9759094a144adcec2eae0aa4ad",
"__meta_kubernetes_pod_annotationpresent_promtail_loki_boltdb_shipper_hash", "true",
"__meta_kubernetes_pod_container_init", "false",
"__meta_kubernetes_pod_container_name", "promtail",
"__meta_kubernetes_pod_container_port_name", "http-metrics",
"__meta_kubernetes_pod_container_port_number", "80",
"__meta_kubernetes_pod_container_port_protocol", "TCP",
"__meta_kubernetes_pod_controller_kind", "DaemonSet",
"__meta_kubernetes_pod_controller_name", "promtail-loki-boltdb-shipper",
"__meta_kubernetes_pod_host_ip", "10.128.0.178",
"__meta_kubernetes_pod_ip", "10.132.183.40",
"__meta_kubernetes_pod_label_controller_revision_hash", "555b77cd7d",
"__meta_kubernetes_pod_label_name", "promtail-loki-boltdb-shipper",
"__meta_kubernetes_pod_label_pod_template_generation", "45",
"__meta_kubernetes_pod_labelpresent_controller_revision_hash", "true",
"__meta_kubernetes_pod_labelpresent_name", "true",
"__meta_kubernetes_pod_labelpresent_pod_template_generation", "true",
"__meta_kubernetes_pod_name", "promtail-loki-boltdb-shipper-jgtr7",
"__meta_kubernetes_pod_node_name", "gke-dev-us-central-0-main-n2s8-2-14d53341-9hkr",
"__meta_kubernetes_pod_phase", "Running",
"__meta_kubernetes_pod_ready", "true",
"__meta_kubernetes_pod_uid", "4c586419-7f6c-448d-aeec-ca4fa5b05e60",
"__metrics_path__", "/metrics",
"__scheme__", "http",
"__scrape_interval__", "15s",
"__scrape_timeout__", "10s",
"job", "kubernetes-pods"),
},
}
for i := range tests {
err := yaml.UnmarshalStrict([]byte(tests[i].config), &tests[i].cfgs)
require.NoError(b, err)
}
for _, tt := range tests {
b.Run(tt.name, func(b *testing.B) {
for i := 0; i < b.N; i++ {
_, _ = Process(tt.lbls, tt.cfgs...)
}
})
}
}
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