1 files changed, 62 insertions, 0 deletions
diff --git a/src/go/collectors/go.d.plugin/pkg/prometheus/selector/expr.go b/src/go/collectors/go.d.plugin/pkg/prometheus/selector/expr.go
new file mode 100644
index 000000000..7593513a5
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/pkg/prometheus/selector/expr.go
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package selector
+
+import "fmt"
+
+type Expr struct {
+	Allow []string `yaml:"allow" json:"allow"`
+	Deny  []string `yaml:"deny" json:"deny"`
+}
+
+func (e Expr) Empty() bool {
+	return len(e.Allow) == 0 && len(e.Deny) == 0
+
+}
+
+func (e Expr) Parse() (Selector, error) {
+	if e.Empty() {
+		return nil, nil
+	}
+
+	var srs []Selector
+	var allow Selector
+	var deny Selector
+
+	for _, item := range e.Allow {
+		sr, err := Parse(item)
+		if err != nil {
+			return nil, fmt.Errorf("parse selector '%s': %v", item, err)
+		}
+		srs = append(srs, sr)
+	}
+
+	switch len(srs) {
+	case 0:
+		allow = trueSelector{}
+	case 1:
+		allow = srs[0]
+	default:
+		allow = Or(srs[0], srs[1], srs[2:]...)
+	}
+
+	srs = srs[:0]
+	for _, item := range e.Deny {
+		sr, err := Parse(item)
+		if err != nil {
+			return nil, fmt.Errorf("parse selector '%s': %v", item, err)
+		}
+		srs = append(srs, sr)
+	}
+
+	switch len(srs) {
+	case 0:
+		deny = falseSelector{}
+	case 1:
+		deny = srs[0]
+	default:
+		deny = Or(srs[0], srs[1], srs[2:]...)
+	}
+
+	return And(allow, Not(deny)), nil
+}