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This article mainly explains "how to use Redis to build an access frequency control module". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to build an access frequency control module with Redis".

Overview of the principle:

The program will determine a time slice, and the smaller the time slice, the higher the control precision. An access control involves multiple time slices.

If the program is required to add an access record at a certain time, it will first calculate the time slice to be used for the current time, and add 1 to the counter of the time slice.

When determining how many times a period of time has been visited, the program first calculates how many time slices the time contains, then takes out all these time slices, adds up the counter and returns.

Principle introduction see here, program related source code here (nodejs)

How to build access Frequency Control Module with Redis

Use the example (nodejs):

Varredback=require ('redback') .createClient ()

Ratelimit=redback.createRateLimit ('requests')

/ / IncrementthecountforthespecifiedIP

Ratelimit.add ('127.0.0.1')

/ / Countthenumberofrequestsinthelast20seconds

Ratelimit.count ('127.0.0.1 err,requests) {

If (requests > 30) {

/ / Throttletheuserinsomeway..

}

})

Thank you for your reading. the above is the content of "how to build access frequency control module with Redis". After the study of this article, I believe you have a deeper understanding of how to build access frequency control module with Redis, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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