Merging upstream version 1.45.3+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/src/go/collectors/go.d.plugin/pkg/prometheus/selector/selector.go b/src/go/collectors/go.d.plugin/pkg/prometheus/selector/selector.go
new file mode 100644
index 000000000..28203fca1
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/pkg/prometheus/selector/selector.go
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package selector
+
+import (
+	"github.com/netdata/netdata/go/go.d.plugin/pkg/matcher"
+
+	"github.com/prometheus/prometheus/model/labels"
+)
+
+type Selector interface {
+	Matches(lbs labels.Labels) bool
+}
+
+const (
+	OpEqual             = "="
+	OpNegEqual          = "!="
+	OpRegexp            = "=~"
+	OpNegRegexp         = "!~"
+	OpSimplePatterns    = "=*"
+	OpNegSimplePatterns = "!*"
+)
+
+type labelSelector struct {
+	name string
+	m    matcher.Matcher
+}
+
+func (s labelSelector) Matches(lbs labels.Labels) bool {
+	if s.name == labels.MetricName {
+		return s.m.MatchString(lbs[0].Value)
+	}
+	if label, ok := lookupLabel(s.name, lbs[1:]); ok {
+		return s.m.MatchString(label.Value)
+	}
+	return false
+}
+
+type Func func(lbs labels.Labels) bool
+
+func (fn Func) Matches(lbs labels.Labels) bool {
+	return fn(lbs)
+}
+
+func lookupLabel(name string, lbs labels.Labels) (labels.Label, bool) {
+	for _, label := range lbs {
+		if label.Name == name {
+			return label, true
+		}
+	}
+	return labels.Label{}, false
+}