[refactor] move valid tx processing to TxDownload

src/node/txdownloadman.h

@@ -152,6 +152,9 @@ public:
      * skipping any combinations that have already been tried. Return the resulting package along with
      * the senders of its respective transactions, or std::nullopt if no package is found. */
     std::optional<PackageToValidate> Find1P1CPackage(const CTransactionRef& ptx, NodeId nodeid);
+
+    /** Respond to successful transaction submission to mempool */
+    void MempoolAcceptedTx(const CTransactionRef& tx);
 };
 } // namespace node
 #endif // BITCOIN_NODE_TXDOWNLOADMAN_H

src/node/txdownloadman_impl.cpp

@@ -75,6 +75,10 @@ std::optional<PackageToValidate> TxDownloadManager::Find1P1CPackage(const CTrans
 {
     return m_impl->Find1P1CPackage(ptx, nodeid);
 }
+void TxDownloadManager::MempoolAcceptedTx(const CTransactionRef& tx)
+{
+    m_impl->MempoolAcceptedTx(tx);
+}
 
 // TxDownloadManagerImpl
 void TxDownloadManagerImpl::ActiveTipChange()
@@ -272,4 +276,16 @@ std::optional<PackageToValidate> TxDownloadManagerImpl::Find1P1CPackage(const CT
     }
     return std::nullopt;
 }
+
+void TxDownloadManagerImpl::MempoolAcceptedTx(const CTransactionRef& tx)
+{
+    // As this version of the transaction was acceptable, we can forget about any requests for it.
+    // No-op if the tx is not in txrequest.
+    m_txrequest.ForgetTxHash(tx->GetHash());
+    m_txrequest.ForgetTxHash(tx->GetWitnessHash());
+
+    m_orphanage.AddChildrenToWorkSet(*tx);
+    // If it came from the orphanage, remove it. No-op if the tx is not in txorphanage.
+    m_orphanage.EraseTx(tx->GetWitnessHash());
+}
 } // namespace node

src/node/txdownloadman_impl.h

@@ -162,6 +162,8 @@ public:
     void ReceivedNotFound(NodeId nodeid, const std::vector<uint256>& txhashes);
 
     std::optional<PackageToValidate> Find1P1CPackage(const CTransactionRef& ptx, NodeId nodeid);
+
+    void MempoolAcceptedTx(const CTransactionRef& tx);
 };
 } // namespace node
 #endif // BITCOIN_NODE_TXDOWNLOADMAN_IMPL_H