Merge #18990: log: Properly log txs rejected from mempool

fa9f20b6477a206adf5089398803b45d1a114b6f log: Properly log txs rejected from mempool (MarcoFalke)

Pull request description:

  Currently `CheckTxInputs` rejections from the mempool are the only rejections that log directly and unconditionally to debug.log instead of leaving it to the caller. This has multiple issues:

  * A rejected RPC transaction will log a redundant failure reason to debug log. All other failures are merely reported to the RPC user.
  * A rejected p2p transaction will log the failure twice. Once with the `MEMPOOLREJ` flag, and once unconditionally.
  * A rejected orphan transaction will log no failure.

  Fix all issues by simply returning the state to the caller, like it is done for all other rejections.

  The patch includes whitespace fixups to highlight relevant parts of the codebase and simplify review.

ACKs for top commit:
  naumenkogs:
    utACK fa9f20b6477a206adf5089398803b45d1a114b6f
  rajarshimaitra:
    Concept ACK. Compiled and ran tests. `fa9f20b`
  jnewbery:
    code review ACK fa9f20b6477a206adf5089398803b45d1a114b6f

Tree-SHA512: 86cc17b2a9239c01c4fc3f254ad48ee1d3883266966b9811030176338b9ac3deaea7ea5babfb8bbf739d7440154e30011fede8f9313175f199d4a062af6494f7

1 files changed, 5 insertions, 3 deletions

diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index a776fdb214..089cf2bdb6 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -1989,7 +1989,10 @@ void static ProcessOrphanTx(CConnman* connman, CTxMemPool& mempool, std::set<uin
                 if (MaybePunishNodeForTx(fromPeer, orphan_state)) {
                     setMisbehaving.insert(fromPeer);
                 }
-                LogPrint(BCLog::MEMPOOL, "   invalid orphan tx %s\n", orphanHash.ToString());
+                LogPrint(BCLog::MEMPOOL, "   invalid orphan tx %s from peer=%d. %s\n",
+                    orphanHash.ToString(),
+                    fromPeer,
+                    orphan_state.ToString());
             }
             // Has inputs but not accepted to mempool
             // Probably non-standard or insufficient fee
@@ -2946,8 +2949,7 @@ void ProcessMessage(
         // peer simply for relaying a tx that our recentRejects has caught,
         // regardless of false positives.
 
-        if (state.IsInvalid())
-        {
+        if (state.IsInvalid()) {
             LogPrint(BCLog::MEMPOOLREJ, "%s from peer=%d was not accepted: %s\n", tx.GetHash().ToString(),
                 pfrom.GetId(),
                 state.ToString());