feat: go/rust compatible python implementation of gossipsub interop

[Winter-Soren]

Adds a Python implementation for GossipSub interoperability testing, enabling cross-language compatibility testing between Python (py-libp2p), Go (go-libp2p), and Rust (rust-libp2p) implementations using the Shadow network simulator.

What's Added

• Python Implementation (py-libp2p/main.py) - Full Shadow-compatible GossipSub node
• Docker Environment - Complete setup for running Shadow simulator on macOS
• Test Compositions - Support for python-and-go, python-and-rust, and all-three scenarios

Key Features

• ✅ Deterministic ED25519 peer ID generation (compatible with Go/Rust)
• ✅ Shadow simulator hostname resolution (node{id} pattern)
• ✅ Structured JSON logging to stdout
• ✅ All script instructions supported (connect, publish, subscribe, etc.)
• ✅ Message ID calculation matching Go/Rust implementations

Testing

The Python implementation follows the exact same Shadow compatibility requirements as the existing Go and Rust implementations, ensuring seamless interoperability testing across all three language implementations.

[MarcoPolo]

let's move this change to a separate PR.

[Winter-Soren]

Sure, I will move it to a separate PR!

[MarcoPolo]

We should commit the uv.lock file as well

[Winter-Soren]

Sure, I'll add uv.lock file!

[MarcoPolo]

Did you actually run this and get successful results?

[Winter-Soren]

Did you actually run this and get successful results?

Hi @MarcoPolo
I haven’t run the tests yet because I’m facing build issues with the Shadow simulator. I’m currently moving toward a Docker-based setup without the Shadow simulator. Once this is done, I hope we can arrive at a successful conclusion.

[MarcoPolo]

Shadow is different from docker. These tests are only expected to run within shadow. What are the build issues? Are you building on a released version of Shadow? Shadow only works on linux amd64.

[Winter-Soren]

Shadow is different from docker. These tests are only expected to run within shadow. What are the build issues? Are you building on a released version of Shadow? Shadow only works on linux amd64.

I am using macOS, where I am creating a Docker container with Ubuntu 24.04 and attempting to build the released version of Shadow by following the documentation. I have attached a screenshot below that shows the issue occurring during the build.
Could you guide me further on this build issue? For now, I am proceeding without the Shadow simulator.

[MarcoPolo]

I am using macOS, where I am creating a Docker container with Ubuntu 24.04 and attempting to build the released version of Shadow by following the documentation. I have attached a screenshot below that shows the issue occurring during the build. Could you guide me further on this build issue? For now, I am proceeding without the Shadow simulator.

You need to run this on an amd64 linux. Docker won't work.

[Winter-Soren]

I am using macOS, where I am creating a Docker container with Ubuntu 24.04 and attempting to build the released version of Shadow by following the documentation. I have attached a screenshot below that shows the issue occurring during the build. Could you guide me further on this build issue? For now, I am proceeding without the Shadow simulator.
You need to run this on an amd64 linux. Docker won't work.

Thank you for the clarification, I'll get start with Shadow Simulator on amd64 linux device along with my team and get back to you!