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fix(p2p/discover): fix a race where table loop would self-lookup before returning from constructor #19562#2389

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fix(p2p/discover): fix a race where table loop would self-lookup before returning from constructor #19562#2389
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Proposed changes

Ref: ethereum#19562

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  • This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
  • Tested on a private network from the genesis block and monitored the chain operating correctly for multiple epochs.
  • Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
  • Tested the backwards compatibility.
  • Tested with XDC nodes running this version co-exist with those running the previous version.
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fjl and others added 2 commits June 21, 2026 19:57
This change restructures the internals of p2p/discover to make room for
the discv5 code which will soon be added to this package.

- packet type names now have a "V4" suffix.
- ListenUDP returns *UDPv4 instead of *Table. This technically breaks
  the API but the only caller in go-ethereum is package p2p, which uses
  a compatible interface and doesn't need changes.
- The internal transport interface is changed to make Table reusable for v5.
- The 'lookup' code moves from table to transport. This required
  updating the lookup unit test to use udpTest instead of a custom transport.
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3 participants