add requests/errors to stats

util/wrapper/wrapper.go

@@ -4,7 +4,9 @@ import (
 	"context"
 
 	"github.com/micro/go-micro/client"
+	"github.com/micro/go-micro/debug/stats"
 	"github.com/micro/go-micro/metadata"
+	"github.com/micro/go-micro/server"
 )
 
 type clientWrapper struct {
@@ -55,3 +57,19 @@ func FromService(name string, c client.Client) client.Client {
 		},
 	}
 }
+
+// HandlerStats wraps a server handler to generate request/error stats
+func HandlerStats(stats stats.Stats) server.HandlerWrapper {
+	// return a handler wrapper
+	return func(h server.HandlerFunc) server.HandlerFunc {
+		// return a function that returns a function
+		return func(ctx context.Context, req server.Request, rsp interface{}) error {
+			// execute the handler
+			err := h(ctx, req, rsp)
+			// record the stats
+			stats.Record(err)
+			// return the error
+			return err
+		}
+	}
+}