Grab downloader

vendor/github.com/cavaliercoder/grab/rate_limiter.go

@@ -0,0 +1,12 @@
+package grab
+
+import "context"
+
+// RateLimiter is an interface that must be satisfied by any third-party rate
+// limiters that may be used to limit download transfer speeds.
+//
+// A recommended token bucket implementation can be found at
+// https://godoc.org/golang.org/x/time/rate#Limiter.
+type RateLimiter interface {
+	WaitN(ctx context.Context, n int) (err error)
+}