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Allow target_label to be expanded in replace label

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This commit is contained in:
Matti Savolainen 2016-10-11 21:01:22 +03:00
parent 274d008fbf
commit 56e8e7cac3
2 changed files with 99 additions and 2 deletions
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9
relabel/relabel.go
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@ -64,9 +64,14 @@ func relabel(labels model.LabelSet, cfg *config.RelabelConfig) model.LabelSet {
res := cfg.Regex.ExpandString([]byte{}, cfg.Replacement, val, indexes)
if len(res) == 0 {
delete(labels, cfg.TargetLabel)
} else {
labels[cfg.TargetLabel] = model.LabelValue(res)
break
}
target := cfg.Regex.ExpandString([]byte{}, string(cfg.TargetLabel), val, indexes)
if len(target) == 0 {
delete(labels, cfg.TargetLabel)
break
}
labels[model.LabelName(target)] = model.LabelValue(res)
case config.RelabelHashMod:
mod := sum64(md5.Sum([]byte(val))) % cfg.Modulus
labels[cfg.TargetLabel] = model.LabelValue(fmt.Sprintf("%d", mod))

92
relabel/relabel_test.go
View file

@ -277,6 +277,98 @@ func TestRelabel(t *testing.T) {
"my_baz": "bbb",
},
},
{ // valid case
input: model.LabelSet{
"a": "some-name-value",
},
relabel: []*config.RelabelConfig{
{
SourceLabels: model.LabelNames{"a"},
Regex: config.MustNewRegexp("some-([^-]+)-([^,]+)"),
Action: config.RelabelReplace,
Replacement: "${2}",
TargetLabel: model.LabelName("${1}"),
},
},
output: model.LabelSet{
"a": "some-name-value",
"name": "value",
},
},
{ // invalid replacement ""
input: model.LabelSet{
"a": "some-name-value",
},
relabel: []*config.RelabelConfig{
{
SourceLabels: model.LabelNames{"a"},
Regex: config.MustNewRegexp("some-([^-]+)-([^,]+)"),
Action: config.RelabelReplace,
Replacement: "${3}",
TargetLabel: model.LabelName("${1}"),
},
},
output: model.LabelSet{
"a": "some-name-value",
},
},
{ // invalid target_label ""
input: model.LabelSet{
"a": "some-name-value",
},
relabel: []*config.RelabelConfig{
{
SourceLabels: model.LabelNames{"a"},
Regex: config.MustNewRegexp("some-([^-]+)-([^,]+)"),
Action: config.RelabelReplace,
Replacement: "${1}",
TargetLabel: model.LabelName("${3}"),
},
},
output: model.LabelSet{
"a": "some-name-value",
},
},
{ // more complex real-life like usecase
input: model.LabelSet{
"__meta_sd_tags": "path:/secret,job:some-job,label:foo=bar",
},
relabel: []*config.RelabelConfig{
{
SourceLabels: model.LabelNames{"__meta_sd_tags"},
Regex: config.MustNewRegexp(".*?(?:,|^)path:(/[^,]+).*"),
Action: config.RelabelReplace,
Replacement: "${1}",
TargetLabel: model.LabelName("__metrics_path__"),
},
{
SourceLabels: model.LabelNames{"__meta_sd_tags"},
Regex: config.MustNewRegexp(".*?(?:,|^)job:([^,]+).*"),
Action: config.RelabelReplace,
Replacement: "${1}",
TargetLabel: model.LabelName("job"),
},
{
SourceLabels: model.LabelNames{"__meta_sd_tags"},
Regex: config.MustNewRegexp(".*?(?:,|^)label:([^=]+)=([^,]+).*"),
Action: config.RelabelReplace,
Replacement: "${2}",
TargetLabel: model.LabelName("__meta_sd_add_label_${1}"),
},
{
Regex: config.MustNewRegexp("__meta_sd_add_label_(.*)"),
Replacement: "${1}",
Action: config.RelabelLabelMap,
},
},
output: model.LabelSet{
"__meta_sd_tags": "path:/secret,job:some-job,label:foo=bar",
"__metrics_path__": "/secret",
"job": "some-job",
"__meta_sd_add_label_foo": "bar",
"foo": "bar",
},
},
}
for i, test := range tests {