wallet, rpc: show mempool conflicts in `gettransaction` result

src/wallet/rpc/transactions.cpp

@@ -40,6 +40,10 @@ static void WalletTxToJSON(const CWallet& wallet, const CWalletTx& wtx, UniValue
     for (const uint256& conflict : wallet.GetTxConflicts(wtx))
         conflicts.push_back(conflict.GetHex());
     entry.pushKV("walletconflicts", conflicts);
+    UniValue mempool_conflicts(UniValue::VARR);
+    for (const Txid& mempool_conflict : wtx.mempool_conflicts)
+        mempool_conflicts.push_back(mempool_conflict.GetHex());
+    entry.pushKV("mempoolconflicts", mempool_conflicts);
     entry.pushKV("time", wtx.GetTxTime());
     entry.pushKV("timereceived", int64_t{wtx.nTimeReceived});
 
@@ -417,6 +421,10 @@ static std::vector<RPCResult> TransactionDescriptionString()
            }},
            {RPCResult::Type::STR_HEX, "replaced_by_txid", /*optional=*/true, "Only if 'category' is 'send'. The txid if this tx was replaced."},
            {RPCResult::Type::STR_HEX, "replaces_txid", /*optional=*/true, "Only if 'category' is 'send'. The txid if this tx replaces another."},
+           {RPCResult::Type::ARR, "mempoolconflicts", "Transactions that directly conflict with either this transaction or an ancestor transaction",
+           {
+               {RPCResult::Type::STR_HEX, "txid", "The transaction id."},
+           }},
            {RPCResult::Type::STR, "to", /*optional=*/true, "If a comment to is associated with the transaction."},
            {RPCResult::Type::NUM_TIME, "time", "The transaction time expressed in " + UNIX_EPOCH_TIME + "."},
            {RPCResult::Type::NUM_TIME, "timereceived", "The time received expressed in " + UNIX_EPOCH_TIME + "."},

test/functional/wallet_basic.py

@@ -679,7 +679,7 @@ class WalletTest(BitcoinTestFramework):
                                  "category": baz["category"],
                                  "vout":     baz["vout"]}
         expected_fields = frozenset({'amount', 'bip125-replaceable', 'confirmations', 'details', 'fee',
-                                     'hex', 'lastprocessedblock', 'time', 'timereceived', 'trusted', 'txid', 'wtxid', 'walletconflicts'})
+                                     'hex', 'lastprocessedblock', 'time', 'timereceived', 'trusted', 'txid', 'wtxid', 'walletconflicts', 'mempoolconflicts'})
         verbose_field = "decoded"
         expected_verbose_fields = expected_fields | {verbose_field}
 

test/functional/wallet_conflicts.py

@@ -178,6 +178,8 @@ class TxConflicts(BitcoinTestFramework):
         assert_equal(alice.listunspent(), [unspents[0]])
         assert_equal(alice.getbalance(), 25)
 
+        assert_equal(alice.gettransaction(tx1_txid)["mempoolconflicts"], [tx2_txid])
+
         self.log.info("Test scenario where a mempool conflict is removed")
 
         # broadcast tx3, replaces tx2 in mempool
@@ -187,6 +189,7 @@ class TxConflicts(BitcoinTestFramework):
         # tx1 is no longer conflicted.
         alice.sendrawtransaction(tx3)
 
+        assert_equal(alice.gettransaction(tx1_txid)["mempoolconflicts"], [])
         assert tx1_txid not in self.nodes[0].getrawmempool()
 
         # now all of alice's outputs should be considered spent
@@ -262,6 +265,10 @@ class TxConflicts(BitcoinTestFramework):
         assert tx2_txid in bob.getrawmempool()
         assert tx1_conflict_txid in bob.getrawmempool()
 
+        assert_equal(bob.gettransaction(tx1_txid)["mempoolconflicts"], [tx1_conflict_txid])
+        assert_equal(bob.gettransaction(tx2_txid)["mempoolconflicts"], [])
+        assert_equal(bob.gettransaction(tx3_txid)["mempoolconflicts"], [tx1_conflict_txid])
+
         # check that tx3 is now conflicted, so the output from tx2 can now be spent
         assert_equal(bob.getbalances()["mine"]["untrusted_pending"], Decimal("24.99990000"))
 
@@ -348,6 +355,8 @@ class TxConflicts(BitcoinTestFramework):
         assert_equal(alice.getbalance(), 25)
         assert_equal(bob.getbalances()["mine"]["untrusted_pending"], Decimal("24.99990000"))
 
+        assert_equal(bob.gettransaction(tx1_txid)["mempoolconflicts"],  [])
+
         raw_tx = bob.createrawtransaction(inputs=[bob.listunspent(minconf=0)[0]], outputs=[{carol.getnewaddress() : 24.999}])
         # Bob creates a child to tx1
         tx1_child = bob.signrawtransactionwithwallet(raw_tx)['hex']
@@ -356,6 +365,8 @@ class TxConflicts(BitcoinTestFramework):
         self.sync_mempools()
 
         # Currently neither tx1 nor tx1_child should have any conflicts
+        assert_equal(bob.gettransaction(tx1_txid)["mempoolconflicts"],  [])
+        assert_equal(bob.gettransaction(tx1_child_txid)["mempoolconflicts"],  [])
         assert tx1_txid in bob.getrawmempool()
         assert tx1_child_txid in bob.getrawmempool()
         assert_equal(len(bob.getrawmempool()), 2)
@@ -378,6 +389,10 @@ class TxConflicts(BitcoinTestFramework):
         assert tx1_conflict_txid in bob.getrawmempool()
         assert_equal(len(bob.getrawmempool()), 1)
 
+        # Now both tx1 and tx1_child are conflicted by tx1_conflict
+        assert_equal(bob.gettransaction(tx1_txid)["mempoolconflicts"],  [tx1_conflict_txid])
+        assert_equal(bob.gettransaction(tx1_child_txid)["mempoolconflicts"],  [tx1_conflict_txid])
+
         # Now create a conflict to tx1_conflict, so that it gets kicked out of the mempool
         raw_tx = alice.createrawtransaction(inputs=[unspents[1]], outputs=[{carol.getnewaddress() : 24.9895}])
         tx1_conflict_conflict = alice.signrawtransactionwithwallet(raw_tx)['hex']
@@ -385,6 +400,10 @@ class TxConflicts(BitcoinTestFramework):
 
         self.sync_mempools()
 
+        # Now that tx1_conflict has been removed, both tx1 and tx1_child
+        assert_equal(bob.gettransaction(tx1_txid)["mempoolconflicts"],  [])
+        assert_equal(bob.gettransaction(tx1_child_txid)["mempoolconflicts"],  [])
+
         # Both tx1 and tx1_child are still not in the mempool because they have not be re-broadcasted
         assert tx1_txid not in bob.getrawmempool()
         assert tx1_child_txid not in bob.getrawmempool()