Reading the counter value from the cache

[LidiaSongstad]

Hi - There are examples to read the policy details from the policy store. Can we read the counter value from the counter store . we are using distributed cache to store the values.

Thanks,

[Thomas Ardal]

Did you find a way to do this? I'm thinking about pulling some stats from the store to warn users when getting close to the limit, etc.

[LidiaSongstad]

yes.. figured out a way to read from the cache by referring the code to understand how the keys are generated to store the counter value ..
var bytes = Encoding.UTF8.GetBytes($"crlc_{clientId}_{period}");
using var algorithm = SHA1.Create();
var hash = algorithm.ComputeHash(bytes);
var key = Convert.ToBase64String(hash);
var rateLimitCounter = (await _cache.GetAsync(key));
if (rateLimitCounter.HasValue)
{
RateLimitCounter value = (await _cache.GetAsync(key)).Value;
}

Hope this helps .. If you found a better way , please share..

Thanks,

[Thomas Ardal]

Thank you very much. I am able to pull the counter with that code 👍 Suggestions to your code. You can inject IOptions<ClientRateLimitOptions> and get the value from that. Then crlc will be accessible through options.RateLimitCounterPrefix. Not sure if that string ever changes so may not be a huge benefit. Another is that you can maybe optimize the code a bit by changing it to:

var rateLimitCounter = await _cache.GetAsync(key);
if (rateLimitCounter.HasValue)
{
    RateLimitCounter value = rateLimitCounter.Value;
}

[LidiaSongstad]

You are welcome. Thanks for your suggestion..