Merge #11203: rpc: add wtxid to mempool entry output

617c459 qa: rpc test for wtxid in mempool entry (Suhas Daftuar)
7e5d596 RPC: add wtxid to mempool entry output (Suhas Daftuar)

Pull request description:

  We already cache this information in the mempool, so including it in the output of rpc calls is basically free.

Tree-SHA512: 2757e1bfca028103937e4b76ce1a5d805846bad5d3d9dd631dcc5f87721bcc0e9d19e437e02053ef1dd3b38b503f0fca8c0b8492cac37dfbd70256a3665f704c

Author: laanwj

src/rpc/blockchain.cpp

@@ -343,6 +343,7 @@ std::string EntryDescriptionString()
            "    \"ancestorcount\" : n,    (numeric) number of in-mempool ancestor transactions (including this one)\n"
            "    \"ancestorsize\" : n,     (numeric) virtual transaction size of in-mempool ancestors (including this one)\n"
            "    \"ancestorfees\" : n,     (numeric) modified fees (see above) of in-mempool ancestors (including this one)\n"
+           "    \"wtxid\" : hash,         (string) hash of serialized transaction, including witness data\n"
            "    \"depends\" : [           (array) unconfirmed transactions used as inputs for this transaction\n"
            "        \"transactionid\",    (string) parent transaction id\n"
            "       ... ]\n";
@@ -363,6 +364,7 @@ void entryToJSON(UniValue &info, const CTxMemPoolEntry &e)
     info.push_back(Pair("ancestorcount", e.GetCountWithAncestors()));
     info.push_back(Pair("ancestorsize", e.GetSizeWithAncestors()));
     info.push_back(Pair("ancestorfees", e.GetModFeesWithAncestors()));
+    info.push_back(Pair("wtxid", mempool.vTxHashes[e.vTxHashesIdx].first.ToString()));
     const CTransaction& tx = e.GetTx();
     std::set<std::string> setDepends;
     for (const CTxIn& txin : tx.vin)

test/functional/segwit.py

@@ -279,6 +279,9 @@ def run_test(self):
         assert(txid2 in template_txids)
         assert(txid3 in template_txids)
 
+        # Check that wtxid is properly reported in mempool entry
+        assert_equal(int(self.nodes[0].getmempoolentry(txid3)["wtxid"], 16), tx.calc_sha256(True))
+
         # Mine a block to clear the gbt cache again.
         self.nodes[0].generate(1)