Help with collecting bandwidth stats using BandwidthTransport in Rust-libp2p

[Hediii-coder]

Hi all,

I’m working on a Rust project using rust-libp2p and trying to instrument my network with bandwidth metrics. I’m using the BandwidthTransport wrapper around my transport and have set up a prometheus_client::Registry to collect metrics.

Here is what I have so far:

I create my base transport (TCP + Noise + Yamux).

I wrap it with BandwidthTransport::new(transport, &mut registry).

I then create a Swarm using this bandwidth-wrapped transport.

My goal is to periodically read bandwidth stats (sent/received bytes, rates, etc.) from the Metrics associated with the BandwidthTransport and output them (e.g., log or expose via Prometheus).

I’m struggling with:

How exactly to access the bandwidth stats from Metrics or BandwidthTransport after the swarm is running.

How to properly integrate this with SwarmBuilder::with_bandwidth_metrics() if I want to use it.

Any examples or idiomatic ways to expose or print bandwidth usage in runtime.

I haven’t found clear examples or docs on how to read and output these bandwidth metrics at runtime.

Could anyone provide guidance, example snippets, or best practices for:

Accessing current bandwidth stats from the swarm or metrics instance.

Integrating BandwidthTransport with SwarmBuilder::with_bandwidth_metrics().

Exposing or logging bandwidth data during the swarm event loop.

I can share part of my code if it is possible

Thanks in advance for any help!