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Only respond to requests for recently announced transactions
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Authored by PiRK on Tue, Apr 20, 16:09.

Details

Summary

... unless they're UNCONDITIONAL_RELAY_DELAY old, or there has been
a response to a MEMPOOL request in the mean time.

This is accomplished using a rolling Bloom filter for the last
3500 announced transactions. The probability of seeing more than 100
broadcast events (which can be up to 35 txids each) in 2 minutes for
an outbound peer (where the average frequency is one per minute), is
less than 1 in a million.

This is a partial backport of core#19109 [3/5]
https://github.com/bitcoin/bitcoin/pull/19109/commits/43f02ccbff9b137d59458da7a8afdb0bf80e127f

Depends on D9435

Test Plan

ninja all check-all

Diff Detail

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rABC Bitcoin ABC
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