Description

Since we merged #3601 we sometimes get ugly (but harmless) error log messages when the endpoint is shutting down:

2025-11-06T11:28:26.721826Z ERROR ep-client:client: iroh::magicsock::transports::relay: relay_recv_channel closed
2025-11-06T11:28:26.721884Z ERROR ep-client:client: iroh_quinn::endpoint: I/O error: connection closed

This fixes it: We already have a check in the transports to return Pending without polling the actual transports once Magicsock::is_closed is true. This PR changes it to instead check Magicsock::is_closing. The latter is set after Endpoint::wait_idle completed, but before cancelling the actor and transport tasks. Whereas is_closed is set after the actor and transport tasks are fully shutdown. When Endpoint::wait_idle completes, we do not expect the quinn endpoint to do anything meaningful, so it is fine to stop polling the transports at this time, and thus not get errors from the transports into quinn if they fail (because they are shutting down).

Breaking Changes

Notes & open questions

Change checklist

• Self-review.
• Documentation updates following the style guide, if relevant.
• Tests if relevant.
• All breaking changes documented.
  • List all breaking changes in the above "Breaking Changes" section.
  • Open an issue or PR on any number0 repos that are affected by this breaking change. Give guidance on how the updates should be handled or do the actual updates themselves. The major ones are:
    • quic-rpc
    • iroh-gossip
    • iroh-blobs
    • dumbpipe
    • sendme