Possible resolutions to Hole Punching issues

[seetadev]

Summary of Issues

The CI (py311-lint) failed due to:

• Pre-commit formatting issues
• Mypy type-checking errors
• Pyrefly type-checking errors

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Pre-commit Fixes

1. pyupgrade auto-fixed legacy Python syntax in nat.py. ✅

2. ruff fixed most issues, but one long line remains:

   • File: libp2p/relay/circuit_v2/nat.py

   • Line 252: line exceeds 88 characters

     # If any address doesn't start with /p2p-circuit, it's a direct connection

   • Fix: Wrap or shorten this comment line.

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Type Errors: mypy + pyrefly

You need to fix or annotate the code to satisfy static typing tools.

In nat.py

• INetConn has no method named get_transport_addresses.

  • Lines: 250, 258
  • Check the actual interface definition of INetConn.
  • Is the method name a typo? Should it be something like get_peer_addresses or get_addrs?

In dcutr.py

1. Wrong type assignments:

   foo.type = 1  #  Expected `Type`, not `int`

   • Lines: 211, 314, 365
   • Fix: Make sure you're assigning type(...), not int.

2. Missing return statement:

   • Line 267: A function declared to return bool does not return on all paths.

3. Missing annotation:

   • Line 517: Add type hint to variable connections.

4. Non-iterable INetConn used in iteration:

   • Line 522: You are iterating over an object of type INetConn, which is not iterable.
   • Fix: Confirm the expected type; if it's always a list, cast/check before iterating.

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Final Action Checklist

• Fix long line in nat.py (line 252)
• Verify and possibly rename get_transport_addresses on INetConn
• Correct assignments of .type in dcutr.py
• Ensure all return paths return a bool (line 267)
• Add type annotation to connections (line 517)
• Fix iteration over possibly non-iterable object (line 522)
• Re-run pre-commit run --all-files locally after applying fixes