A simple proxy middleware and global rate limiter using Golang and gin for rate limiting your exposed API's
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There will be scenarios where you would need to protect your systems using a rate limiter, althoug many tools are available out there, but most of the implementation of such systems are complex so sharing a simple global rate limiting tool to help and protect your microservice's rest API from serving too may requests and making the system down.
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This is suitable for small scale application that is exposing API's, where you don't need to install additional tools like Kong or Istio Mesh etc for rate limiting and avoid the over head of managing and mainting such systems, you only need to provision a small redis for this set up that's it.
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Create a Redis host, either in AWS or docker in standalone servers etc, this is for implementing the Sliding window based Rate Limiter
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Ensure to change the below variables in main.go as per your requirements.
| variable | description |
|---|---|
| host | the API endpoint to which you want to Proxy pass your requests to |
| requestCount | number of request that is allowed |
| secondsTime | time within which the requests will be throttled |
| redisHost | redis host, replace "127.0.0.1" with the actual Redis host needed for the throttling |
| requestCount | number of request that is allowed |
| port | the port you want the application listen to |
- Change the "requestCount" and "secondsTime" accordingly, here, I throttle all requests if it cross more than "10 requests within 60 seconds"
- follow the below steps after the variables has been changed as per your needs.
cd ginger
go mod init main
go mod tidy
go run main.go- Installation
- Global rate limting demo
As you can see I'm calling this API
curl localhost:8000/api/vehicles/getallmakes of the endpoint "https://vpic.nhtsa.dot.gov/"after 10 calls within 60 seconds I started getting 429, as it exceeded the global rate limit I set
- For deploying to Kubernetes you can dockerise the app using the code shared and deploy it and make this as your gateway proxy.
- contact on LinkedIn