protocol buffers - How to handle error in swift when server is not available?

Question

How to handle error for this server call when the server is not available or is down?

func createData(request:Crudpb_CreateRequest, with completion: @escaping (String) -> Void) throws {
    DispatchQueue.main.async {
        self.response = try! self.client.create(request) // <---- How to handle error for this server call when the server is not available or is down?
        completion(self.response.result)
    }
}

It returns an object, so when I store the result in response variable then say print(response.result) it prints the response string

Please help.

Answer 1

I can't undertand what you are trying to do exactly, don’t know your entire code.

self.client is an object of what Class? What self.client.create method returns? URLResponse?

Anyway, you can try:

if let response = self.response as? HTTPURLResponse{
    if response.statusCode == 503{
        //server not available
    }
}

After your self.client.create method.