[log] add more logs related to orphan handling

- Whenever a tx is erased. Allows somebody to see which transactions
  have been erased due to expiry/overflow, not just how many.
- Whenever a tx is added to a peer's workset.
- AcceptToMemoryPool when a tx is accepted, mirroring the one logged for
  a tx received from a peer. This allows someone to see all of the
  transactions that are accepted to mempool just by looking for ATMP logs.
- MEMPOOLREJ when a tx is rejected, mirroring the one logged for
  a tx received from a peer. This allows someone to see all of the
  transaction rejections by looking at MEMPOOLREJ logs.

Author: glozow

src/net_processing.cpp

@@ -2923,6 +2923,11 @@ bool PeerManagerImpl::ProcessOrphanTx(Peer& peer)
 
         if (result.m_result_type == MempoolAcceptResult::ResultType::VALID) {
             LogPrint(BCLog::TXPACKAGES, "   accepted orphan tx %s (wtxid=%s)\n", orphanHash.ToString(), orphan_wtxid.ToString());
+            LogPrint(BCLog::MEMPOOL, "AcceptToMemoryPool: peer=%d: accepted %s (wtxid=%s) (poolsz %u txn, %u kB)\n",
+                peer.m_id,
+                orphanHash.ToString(),
+                orphan_wtxid.ToString(),
+                m_mempool.size(), m_mempool.DynamicMemoryUsage() / 1000);
             RelayTransaction(orphanHash, porphanTx->GetWitnessHash());
             m_orphanage.AddChildrenToWorkSet(*porphanTx);
             m_orphanage.EraseTx(orphanHash);
@@ -2937,6 +2942,11 @@ bool PeerManagerImpl::ProcessOrphanTx(Peer& peer)
                     orphan_wtxid.ToString(),
                     peer.m_id,
                     state.ToString());
+                LogPrint(BCLog::MEMPOOLREJ, "%s (wtxid=%s) from peer=%d was not accepted: %s\n",
+                    orphanHash.ToString(),
+                    orphan_wtxid.ToString(),
+                    peer.m_id,
+                    state.ToString());
                 // Maybe punish peer that gave us an invalid orphan tx
                 MaybePunishNodeForTx(peer.m_id, state);
             }

src/txorphanage.cpp

@@ -84,6 +84,8 @@ int TxOrphanage::EraseTxNoLock(const uint256& txid)
         m_orphan_list[old_pos] = it_last;
         it_last->second.list_pos = old_pos;
     }
+    const auto& wtxid = it->second.tx->GetWitnessHash();
+    LogPrint(BCLog::TXPACKAGES, "   removed orphan tx %s (wtxid=%s)\n", txid.ToString(), wtxid.ToString());
     m_orphan_list.pop_back();
     m_wtxid_to_orphan_it.erase(it->second.tx->GetWitnessHash());
 
@@ -160,6 +162,8 @@ void TxOrphanage::AddChildrenToWorkSet(const CTransaction& tx)
                 std::set<uint256>& orphan_work_set = m_peer_work_set.try_emplace(elem->second.fromPeer).first->second;
                 // Add this tx to the work set
                 orphan_work_set.insert(elem->first);
+                LogPrint(BCLog::TXPACKAGES, "added %s (wtxid=%s) to peer %d workset\n",
+                         tx.GetHash().ToString(), tx.GetWitnessHash().ToString(), elem->second.fromPeer);
             }
         }
     }