1 files changed, 24 insertions, 0 deletions
diff --git a/plugin/metrics/context.go b/plugin/metrics/context.go
new file mode 100644
index 000000000..4cce871f5
--- /dev/null
+++ b/plugin/metrics/context.go
@@ -0,0 +1,24 @@
+package metrics
+
+import (
+	"github.com/coredns/coredns/plugin"
+
+	"golang.org/x/net/context"
+)
+
+// WithServer returns the current server handling the request. It returns the
+// server listening address: <scheme>://[<bind>]:<port> Normally this is
+// something like "dns://:53", but if the bind plugin is used, i.e. "bind
+// 127.0.0.53", it will be "dns://127.0.0.53:53", etc. If not address is found
+// the empty string is returned.
+//
+// Basic usage with a metric:
+//
+// <metric>.WithLabelValues(metrics.WithServer(ctx), labels..).Add(1)
+func WithServer(ctx context.Context) string {
+	srv := ctx.Value(plugin.ServerCtx{})
+	if srv == nil {
+		return ""
+	}
+	return srv.(string)
+}