github.com/andrewstuart/limio (go): Package limio provides an interface for rate limiting as well as a rate-limited Reader implementation.  In limio, there are two important interfaces for rate limiting. The first, Limiter, is more primitive. Most times, implementers of a Limiter should be creating a way to apply time constraints to a discretely quantifiable transaction.  The other interface is a Manager, which will likely be implemented in many more cases, as it allows consumers to take any number of Limiters and apply a strategy to the group. Most importantly, a Manager will also need to implement the Limiter interface, allowing consumers to treat its encapsulated group of Limiters as a single Limiter, knowing the strategy will be applied within the given limits.
Keywords: golang|rate|rate-limiting|reader