BrakePedal.Memcached

BrakePedal.Memcached is an extension to the BrakePedal throttling and rate-limiting library. BrakePedal.Memcached adds support for Memcached backed throttling.

The core library provides the following features:

• Throttling: limit X attempts over Y time period.
• Locking: after X attempts over Y time period block future attempts for Z time period.

Packages

Current Version: 1.0.0

Target Framework: .NET 4.5 and up.

• BrakePedal.Memcached contains an implementation of a Memcached throttle repository which uses EnyimMemcached
  • nuget.org/packages/BrakePedal.Memcached/

Dependencies:

• BrakePedal
  • nuget.org/packages/BrakePedal
• EnyimMemcached
  • nuget.org/packages/EnyimMemcached/

Usage

1. Begin with a Memcached client and repository:

    MemcachedClient client = new MemcachedClient();
    var repository = new MemcachedThrottleRepository(client);
   

2. Configure a policy:

    var loginPolicy = new ThrottlePolicy(repository)
    {
        Name = "LoginAttempts",
        Prefixes = new[] {"login:attempts"},
        Limiters = new Limiter[]
        {
            new Limiter().Limit(3).Over(TimeSpan.FromSeconds(10)) 
        }
    };
   

Once the policies have been defined they can be used as follows:

1. Create a key that can unique identify the requester.

    var key = new SimpleThrottleKey("username");
   

2. Check the policy:

    var check = loginPolicy.Check(key); // NOTE: by default, calling the check method will increment the counter.
                                        // If you want to check the status of a policy but not increment the counter
                                        // pass in false to the increment parameter as follows.
                                        // loginPolicy.Check(key, increment = false); 
    
    if (check.IsThrottled)
    {
        throw new Exception($"Requests throttled. Maximum allowed { check.Limiter.Count } per { check.Limiter.Period }.");
    }
   

References

For more information consult the documentation for BrakePedal and EnyimMemcached.