feat(iroh-net): allow the underlying UdpSockets to be rebound

[dignifiedquire]

Description

In order to handle supsension and exits on mobile. we need to rebind our UDP sockets when they break.

This PR adds the ability to rebind the socket on errors, and does so automatically on known suspension errors for iOS.

When reviewing this, please specifically look at the duration of lock holding, as this is the most sensitive part in this code.

Some references for these errors

• https://github.com/libevent/libevent/pull/1031
• https://github.com/n0-computer/iroh/issues/2939

TODOs

• [x] code cleanup
• [x] testing on actual ios apps, to see if this actually fixes the issues
• [ ] potentially handle port still being in use? this needs some more thoughts

Closes #2939

Breaking Changes

There will be some in the netmon::UdpSocket API

Notes & open questions

• I have tried putting this logic higher in the stack, but unfortunately that did not work out.
• We might not want to infinitely rebind a socket if the same error happens over and over again, unclear how to handle this.

Change checklist

• [ ] Self-review.
• [ ] Documentation updates following the style guide, if relevant.
• [ ] Tests if relevant.
• [ ] All breaking changes documented.

[github-actions[bot]]

Documentation for this PR has been generated and is available at: https://n0-computer.github.io/iroh/pr/2946/docs/iroh/

Last updated: 2024-11-25T19:22:11Z

[github-actions[bot]]

Netsim report & logs for this PR have been generated and is available at: LOGS This report will remain available for 3 days.

Last updated for commit: ff1f67d

[Arqu]

Current run	test	case	throughput_gbps	throughput_transfer
iroh	1_to_1	0.65	1.05
iroh	1_to_3	1.46	2.14
iroh	1_to_5	2.88	4.96
iroh	1_to_10	4.31	5.62
iroh	2_to_2	1.05	1.61
iroh	2_to_4	2.03	3.16
iroh	2_to_6	3.19	4.86
iroh	2_to_10	4.58	6.48

From the last merged PR	test	case	throughput_gbps	throughput_transfer
iroh	1_to_1	0.55	0.83
iroh	1_to_3	1.27	1.76
iroh	1_to_5	2.12	2.94
iroh	1_to_10	3.70	4.66
iroh	2_to_2	0.56	0.70
iroh	2_to_4	1.13	1.41
iroh	2_to_6	1.99	2.65
iroh	2_to_10	3.34	4.46