test: measures the max send rate and adds a test to ensure the max rate is observed

[staheri14]

Part of #1111

[cmwaters]

What happens when the flow rate is exceeded i.e. how is rate limiting of messages per peer conducted?

[evan-forbes]

nice

[staheri14]

What happens when the flow rate is exceeded i.e. how is rate limiting of messages per peer conducted?

The expected data transmission rate is enforced by the implementation and should not exceed it. At a high level, the amount of data that can be sent every 100 ms (referred to as the sample rate) is calculated using a uniform distribution, specifically as SendRate * 0.1. When we wish to send data, we do so in batches of 10, each with a size of 1034 bytes, totalling 10340 bytes. However, before sending this data, we check whether we have exceeded the maximum allowed send amount for the current sample period, which is SendRate * 0.1. If we have not exceeded this limit, the batch is sent. If we have exceeded it, the sending procedure is blocked until the current sample period concludes, and a new sample period begins. I have provided code references in the original issue i.e., #1111 (comment)

[cmwaters]

Thanks for the context. So to summarise we block but don't drop the messages?

[staheri14]

Thanks for the context. So to summarise we block but don't drop the messages?

Correct.