[release-v2.0] multi: Main module backports. #3392
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This adds a cache to house transactions that have recently been advertised to other peers. It makes use of the new container/lru module to handle automatic expiration of entries and maximum entry limiting. The rationale for this change is that it is considered misbehavior to advertise a transaction and then claim it is not found when the corresponding request arrives. Maintaining a separate cache of advertised transactions for a short period of time after they were advertised significantly increases the probability they are available to serve when a request for the advertisement arrives independent of the current status of the unconfirmed transaction mempool.
Now that recently removed mix messages are independently cached for a short period, this reverts the change that only removed spent pair requests from previous block transactions to make it track the current best tip again. For reference, the change was originally made to avoid immediately removing mixpool messages that are still propagating the network when a block was quickly mined which includes transactions created from those very same mix messages. However, as noted when the change was made, while it was a quick way to address the stated scenario, it doesn't deal with large reorgs nicely. The new method is much more robust and works under all scenarios, so it is preferable for the mixpool to track the current tip.
The current logic attempts to maintain at least one mix capable outbound peer to ensure better connectivity among the mix capable peers. It works as intended, however, only having a single mix capable peer means there will be delays if that peer goes offline until a replacement is found. A possible consequence is that any mix clients might potentially get interrupted if that peer goes offline and a replacement isn't found quickly enough. Attempting to maintain a minimum of three mix capable outbound peers will significantly reduce the likelihood of having periods without any mix capable peers. This updates the logic accordingly.
jrick
approved these changes
Jun 19, 2024
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This is a backport of the following PRs to the 2.0 release branch: