uber rate limit wrappers

uber.go

@@ -0,0 +1,40 @@
+package ratelimit
+
+import (
+	"github.com/micro/go-micro/client"
+	"github.com/micro/go-micro/server"
+	"go.uber.org/ratelimit"
+
+	"golang.org/x/net/context"
+)
+
+type clientWrapper struct {
+	r ratelimit.Limiter
+	client.Client
+}
+
+func (c *clientWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
+	c.r.Take()
+	return c.Client.Call(ctx, req, rsp, opts...)
+}
+
+// NewClientWrapper creates a blocking side rate limiter
+func NewClientWrapper(rate int) client.Wrapper {
+	r := ratelimit.New(rate)
+
+	return func(c client.Client) client.Client {
+		return &clientWrapper{r, c}
+	}
+}
+
+// NewHandlerWrapper creates a blocking server side rate limiter
+func NewHandlerWrapper(rate int) server.HandlerWrapper {
+	r := ratelimit.New(rate)
+
+	return func(h server.HandlerFunc) server.HandlerFunc {
+		return func(ctx context.Context, req server.Request, rsp interface{}) error {
+			r.Take()
+			return h(ctx, req, rsp)
+		}
+	}
+}