SpringCloud uses Zuul (spring-cloud-zuul-ratelimit).

Description:

Github address of Spring Cloud Zuul Rate Limit project:

/marcosbarbero/ Spring-cloud-zuul-ratelimit

This package realizes that in Zuul's development of micro-services, it is sometimes necessary to limit the flow of the API to prevent network attacks, such as making a short message verification code API. Limiting the request rate of the client can resist the short message bombing attack to a certain extent and reduce losses. Micro-service gateway is the necessary entrance for every request, which is very suitable for API flow limiting and authentication. This paper introduces how Zuul performs flow limiting.

Personal suggestion: If the micro-service business changes at the gateway, the gateway will also change, and it involves calls between micro-services. This gateway can't limit the flow. Therefore, fine-grained current limiting cannot be done on the gateway. The gateway mainly limits the concurrent processing ability of the server hardware equipment, and the fine-grained current limiting is still handed over to a special fuse current limiting micro-service. This is conducive to the deconstruction of micro-services and the collaborative development of teams

1. Current limiting strategy

2. Available realization

Bucket4j requires related bean @ qualifier ("rate limit"):

3. Common configuration attributes

Related attributes of policy

4. How to deal with an error

1. Import a dependency

2. Start a class annotation solution

3. Configure a file

4. Visit after starting

Because we are configured to allow only three requests per second, when we exceed it, Too many request exceptions will be thrown

5. Customize the Key policy

If you want to control the key policy yourself, you can add your own policy logic by customizing the implementation of the RateLimitKeyGenerator.

instance:

the request is restricted according to the parameters on the request. For example, a request is http://localhost: 97/API-a//hello 2? Name=kevin, and current is limited for the same name value. We set the current limit to be 1 times within 1 minute, so if the request for the name of kevin exceeds 1 times within 1 minute, the current limit will occur.

implementation of custom RateLimitKeyGenerator:

this article ends!

reference: