Throttling Server

It is based on the Token Bucket Algorithm and should run as a service (daemon). The service initializes using the quota.cnf file, which specifies the maximum number of tokens allowed per second.

Every second, each user's bucket is refilled with the maximum allowed tokens. When a client requests a token (GetToken), the service checks the bucket:

If tokens are available, it decrements the count by one and responds with "Allow".

If no tokens remain, it responds with "Deny".

Runs on Port 8077   
Request Format:  "GetToken UserName"  
Respone Format:  "Allow"   
                 "Deny"  

Pre-requisites

1. cmake --version
   cmake version 3.19.0

2. gcc --version gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28)

3. c++ 11 or higher

Dir Structure

1. Source files: throttleserver/server

2. Config file : throttleserver/quota.cnf

3. Client tool src : throttleserver/server/generate_throttle_request.cpp

Build

1. Generate cmake build files

   $cd throttleserver
   $cmake server

2. Build throttleserver and generate_throttle_request client tool

   $cd throttleserver
   $cmake --build .

Run and Test

1. Prepare quota.cnf file

   User:max_tokens_per_second

   sample below
   $cat quota.cnf
   John:5
   Amit:15
   Peter:5
   Bob:10
   Eve:5
   Tom:20

2. Run throttles server

   $cd throttleserver
   $./throttleserver
   Usage: throtlleserver <quota.cnf>
   $./throttleserver quota.cnf

3. Run client tool

   ./generate_throttle_request
   Usage: generate_request <request_count_per_sec>

   Send 50 requests per second for user Tom
   ./generate_throttle_request Tom 50

   Sample output
   [root@dev throttle_server]# ./generate_throttle_request Bob 50
   Generating Request for User:Bob Request Count:50

   [Bob] Allow   
   [Bob] Allow
   [Bob] Allow
   [Bob] Allow
   [Bob] Allow
   [Bob] Allow
   [Bob] Allow
   [Bob] Allow
   [Bob] Allow
   [Bob] Allow
   [Bob] Deny
   [Bob] Deny