Currently Besu has a limited support for sending NewPooledTransactionHashes messages, and other aspect related to reduce transactions synchronization traffic, described in the Ethereum Wire Protocol version 66.
Specifically:
Besu only uses NewPooledTransactionHashes for new local transactions, while it could be extended to any transaction added to the transaction pool
Besu does not limit the sending of the full transaction messages to a small fraction of the connected peers, and sends the new transaction hashes to all the remaining peers
This PR, extends eth/66 support and does some code refactoring, to remove some reduntant code and rename some classes to identify they are related to the NewPooledTransactionHashes message.
The main changes are:
Do not have a separate tracker for transaction hashes, since for them we can reuse PeerTransactionTracker, that tracks full transactions exchange history and sending queue with a peer. So PeerPendingTransactionTracker has been removed. --tx-pool-hashes-max-size is now deprecated and has no more effect and it will be removed in a future release.
When a new peer connects, if it support eth/6[56] then we send all the transaction hashes we have in the pool, otherwise we send the full transactions.
When new transactions are added to the pool, we send full transactions to peers without eth/6[56] support, or to a small fractions of all peers, and then we send only transaction hashes to the remaining peer that support eth/6[56]. Both transactions and transaction hashes are only sent if not already exchanged with that specific peer.
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Fabio Di Fabio
6c179ba596