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Now that we have a reliable way to detect inbound onion peers, this commit
updates our existing eviction protection of 1/4 localhost peers to instead
protect up to 1/4 onion peers (connected via our tor control service), sorted by
longest uptime. Any remaining slots of the 1/4 are then allocated to protect
localhost peers, or 2 localhost peers if no slots remain and 2 or more onion
peers are protected, sorted by longest uptime.
The goal is to avoid penalizing onion peers, due to their higher min ping times
relative to IPv4 and IPv6 peers, and improve our diversity of peer connections.
Thank you to Gregory Maxwell, Suhas Daftuar, Vasil Dimov and Pieter Wuille
for valuable review feedback that shaped the direction.
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and an `m_is_onion` struct member to NodeEvictionCandidate and tests.
We'll use these in the peer eviction logic to protect inbound onion peers
in addition to the existing protection of localhost peers.
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Thank you to Vasil Dimov (vasild) for the suggestion to use std::unordered_set
rather than std::vector for the IsProtected() peer id arguments.
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An unordered set can tell if an element is present in ~O(1) time (constant on
average, worst case linear to the size of the container), which speeds up and
simplifies the lookup in IsEvicted().
Co-authored-by: Vasil Dimov <vd@FreeBSD.org>
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out of net_tests, because the eviction tests:
- are a different domain of test coverage, with different dependencies
- run more slowly than the net tests
- will be growing in size, in this PR branch and in the future, as eviction
test coverage is improved
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