How to limit concurrent connections of clients in Golang GRPC

php Xiaobian Yuzai will introduce to you how to limit concurrent connections of clients in Golang GRPC. When developing with Golang, we often use GRPC for communication between services. However, if left unchecked, clients may experience degraded performance or excessive server load due to too many concurrent connections. Therefore, it is very important to reasonably limit the concurrent connections of clients. Next, we will explain in detail how to implement restrictions and related technical details.

Question content

I am new to GRPC.

I have a task: I have to implement a service in Golang GRPC.

service function:

1. Accept images from the client and save them.
2. Display a list of saved images.

The question is how to limit concurrent connections from clients:

Download/save files (images) - 10 concurrent requests.

Get the list of saved messages - 100 concurrent requests.

Workaround

Based on your comments, it seems that you only want to check how many calls are in progress for a specific rpc function. You can do this using standard go functions (the same approach can be used for any function). For example; as a counter in your service structure:

type server struct { ...
 ...
  downloadcount atomic.int32
 ...
}

Then use it when handling the call:

func (s *Server) Download(context context.Context, *pbpkg.DownloadRequest) (*pbpkg.DownloadRequest, error){
   inProgressCount := downloadCount.Add(1)
   defer downloadCount.Add(-1) // decrease counter when done

   if inProgressCount  > 10 {
      return nil, status.Errorf(codes.ResourceExhausted, "Download limit hit")
   }
   // Do stuff here
}

Please note that I used atomic.int32; there are other methods (sync.mutex, chan, etc.), but it is important to consider race conditions .

I'm sure there are other ways (such as ), but usually the simple ones are the best!

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