The proposed solution is not accurate. There are at least 5 reasons for it. The cache does not provide interlocking control between different threads, therefore multiple requests can be process at the same time introducing extra calls skipping through the throttle. The Filter is being processed ‘too late in the game’ within web API pipeline, … Read more
You cannot simply prevent DoS attacks by chaining throttling down to a single IP or username. You can’t even really prevent rapid-fire login attempts using this method. Why? Because the attack can span multiple IPs and user accounts for the sake of bypassing your throttling attempts. I have seen posted elsewhere that ideally you should … Read more
As suggested, use TPL Dataflow. A TransformBlock<TInput, TOutput> may be what you’re looking for. You define a MaxDegreeOfParallelism to limit how many strings can be transformed (i.e., how many urls can be downloaded) in parallel. You then post urls to the block, and when you’re done you tell the block you’re done adding items and … Read more
I would use the underscore.js or lodash source code to find a well tested version of this function. Here is the slightly modified version of the underscore code to remove all references to underscore.js itself: // Returns a function, that, when invoked, will only be triggered at most once // during a given window of … Read more
After some time passed I’m sure it’s much easier to handle things by your own with setTimeout/clearTimeout(and moving that into separate custom hook) than working with functional helpers. Handling later one creates additional challenges right after we apply that to useCallback that can be recreated because of dependency change but we don’t want to reset … Read more
I’d use a ring buffer of timestamps with a fixed size of M. Each time the method is called, you check the oldest entry, and if it’s less than N seconds in the past, you execute and add another entry, otherwise you sleep for the time difference.
Here’s a generic version of what we’ve been using on Stack Overflow for the past year: /// <summary> /// Decorates any MVC route that needs to have client requests limited by time. /// </summary> /// <remarks> /// Uses the current System.Web.Caching.Cache to store each client request to the decorated route. /// </remarks> [AttributeUsage(AttributeTargets.Method, AllowMultiple = … Read more
netem leverages functionality already built into Linux and userspace utilities to simulate networks. This is actually what Mark’s answer refers to, by a different name. The examples on their homepage already show how you can achieve what you’ve asked for: Examples Emulating wide area network delays This is the simplest example, it just adds a … Read more