Merge #16452: refactor: use RelayTransaction in BroadcastTransaction utility

9bc8b28 refactor : use RelayTransaction in BroadcastTransaction utility (Antoine Riard)

Pull request description:

  Implementing suggestion in bitcoin/bitcoin#15713 (comment).

  Seems a reason of these node utilities is to glue with already there functions, so we should reuse them.

ACKs for top commit:
  MarcoFalke:
    ACK 9bc8b28
  promag:
    ACK 9bc8b28, verified there are no more `PushInventory(CInv(MSG_TX, ...`, nice refactor, 👍 @amitiuttarwar.
  jnewbery:
    ACK 9bc8b28
  jonatack:
    ACK 9bc8b28, second @jnewbery's suggestions, my guess is they could be added without risking delaying this PR.

Tree-SHA512: 841c65d5f0d9ead5380814bb2260d7ebf03f2a9bfa58a1025785d353bdb42f9122cc257993e6a7bd2bd3f2c74db19c5978cc14be0d83258124ca22e33d6d0164

Author: MarcoFalke

src/interfaces/chain.cpp

@@ -9,6 +9,7 @@
 #include <interfaces/handler.h>
 #include <interfaces/wallet.h>
 #include <net.h>
+#include <net_processing.h>
 #include <node/coin.h>
 #include <policy/fees.h>
 #include <policy/policy.h>
@@ -292,8 +293,7 @@ class ChainImpl : public Chain
     }
     void relayTransaction(const uint256& txid) override
     {
-        CInv inv(MSG_TX, txid);
-        g_connman->ForEachNode([&inv](CNode* node) { node->PushInventory(inv); });
+        RelayTransaction(txid, *g_connman);
     }
     void getTransactionAncestry(const uint256& txid, size_t& ancestors, size_t& descendants) override
     {

src/net_processing.cpp

@@ -1305,10 +1305,10 @@ bool static AlreadyHave(const CInv& inv) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
     return true;
 }
 
-static void RelayTransaction(const CTransaction& tx, CConnman* connman)
+void RelayTransaction(const uint256& txid, const CConnman& connman)
 {
-    CInv inv(MSG_TX, tx.GetHash());
-    connman->ForEachNode([&inv](CNode* pnode)
+    CInv inv(MSG_TX, txid);
+    connman.ForEachNode([&inv](CNode* pnode)
     {
         pnode->PushInventory(inv);
     });
@@ -1811,7 +1811,7 @@ void static ProcessOrphanTx(CConnman* connman, std::set<uint256>& orphan_work_se
         if (setMisbehaving.count(fromPeer)) continue;
         if (AcceptToMemoryPool(mempool, orphan_state, porphanTx, &fMissingInputs2, &removed_txn, false /* bypass_limits */, 0 /* nAbsurdFee */)) {
             LogPrint(BCLog::MEMPOOL, "   accepted orphan tx %s\n", orphanHash.ToString());
-            RelayTransaction(orphanTx, connman);
+            RelayTransaction(orphanHash, *connman);
             for (unsigned int i = 0; i < orphanTx.vout.size(); i++) {
                 auto it_by_prev = mapOrphanTransactionsByPrev.find(COutPoint(orphanHash, i));
                 if (it_by_prev != mapOrphanTransactionsByPrev.end()) {
@@ -2498,7 +2498,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
         if (!AlreadyHave(inv) &&
             AcceptToMemoryPool(mempool, state, ptx, &fMissingInputs, &lRemovedTxn, false /* bypass_limits */, 0 /* nAbsurdFee */)) {
             mempool.check(pcoinsTip.get());
-            RelayTransaction(tx, connman);
+            RelayTransaction(tx.GetHash(), *connman);
             for (unsigned int i = 0; i < tx.vout.size(); i++) {
                 auto it_by_prev = mapOrphanTransactionsByPrev.find(COutPoint(inv.hash, i));
                 if (it_by_prev != mapOrphanTransactionsByPrev.end()) {
@@ -2577,7 +2577,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
                     LogPrintf("Not relaying invalid transaction %s from whitelisted peer=%d (%s)\n", tx.GetHash().ToString(), pfrom->GetId(), FormatStateMessage(state));
                 } else {
                     LogPrintf("Force relaying tx %s from whitelisted peer=%d\n", tx.GetHash().ToString(), pfrom->GetId());
-                    RelayTransaction(tx, connman);
+                    RelayTransaction(tx.GetHash(), *connman);
                 }
             }
         }

src/net_processing.h

@@ -90,4 +90,7 @@ struct CNodeStateStats {
 /** Get statistics from node state */
 bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats);
 
+/** Relay transaction to every node */
+void RelayTransaction(const uint256&, const CConnman& connman);
+
 #endif // BITCOIN_NET_PROCESSING_H

src/node/transaction.cpp

@@ -5,6 +5,7 @@
 
 #include <consensus/validation.h>
 #include <net.h>
+#include <net_processing.h>
 #include <txmempool.h>
 #include <util/validation.h>
 #include <validation.h>
@@ -69,10 +70,7 @@ TransactionError BroadcastTransaction(const CTransactionRef tx, uint256& hashTx,
         return TransactionError::P2P_DISABLED;
     }
 
-    CInv inv(MSG_TX, hashTx);
-    g_connman->ForEachNode([&inv](CNode* pnode) {
-        pnode->PushInventory(inv);
-    });
+    RelayTransaction(hashTx, *g_connman);
 
     return TransactionError::OK;
 }