*: Implement collector interface for registry perfdata (#1670)

internal/perfdata/perfdata.go

@@ -0,0 +1,40 @@
+package perfdata
+
+import (
+	"errors"
+
+	"github.com/prometheus-community/windows_exporter/internal/perfdata/perftypes"
+	v1 "github.com/prometheus-community/windows_exporter/internal/perfdata/v1"
+	v2 "github.com/prometheus-community/windows_exporter/internal/perfdata/v2"
+)
+
+type Collector interface {
+	Describe() map[string]string
+	Collect() (map[string]map[string]perftypes.CounterValues, error)
+	Close()
+}
+
+type Engine int
+
+const (
+	_ Engine = iota
+	V1
+	V2
+)
+
+var (
+	ErrUnknownEngine = errors.New("unknown engine")
+	AllInstances     = []string{"*"}
+)
+
+//nolint:ireturn
+func NewCollector(engine Engine, object string, instances []string, counters []string) (Collector, error) {
+	switch engine {
+	case V1:
+		return v1.NewCollector(object, instances, counters)
+	case V2:
+		return v2.NewCollector(object, instances, counters)
+	default:
+		return nil, ErrUnknownEngine
+	}
+}