[RPC] createrawtransaction: add option to set the sequence number per input

qa/rpc-tests/rawtransactions.py

@@ -137,5 +137,11 @@ class RawTransactionsTest(BitcoinTestFramework):
         self.sync_all()
         assert_equal(self.nodes[0].getbalance(), bal+Decimal('50.00000000')+Decimal('2.19000000')) #block reward + tx
 
+        inputs  = [ {'txid' : "1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000", 'vout' : 1, 'sequence' : 1000}]
+        outputs = { self.nodes[0].getnewaddress() : 1 }
+        rawtx   = self.nodes[0].createrawtransaction(inputs, outputs)
+        decrawtx= self.nodes[0].decoderawtransaction(rawtx)
+        assert_equal(decrawtx['vin'][0]['sequence'], 1000)
+
 if __name__ == '__main__':
     RawTransactionsTest().main()

src/rpc/rawtransaction.cpp

@@ -334,6 +334,7 @@ UniValue createrawtransaction(const UniValue& params, bool fHelp)
             "       {\n"
             "         \"txid\":\"id\",    (string, required) The transaction id\n"
             "         \"vout\":n        (numeric, required) The output number\n"
+            "         \"sequence\":n    (numeric, optional) The sequence number\n"
             "       }\n"
             "       ,...\n"
             "     ]\n"
@@ -384,6 +385,12 @@ UniValue createrawtransaction(const UniValue& params, bool fHelp)
             throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, vout must be positive");
 
         uint32_t nSequence = (rawTx.nLockTime ? std::numeric_limits<uint32_t>::max() - 1 : std::numeric_limits<uint32_t>::max());
+
+        // set the sequence number if passed in the parameters object
+        const UniValue& sequenceObj = find_value(o, "sequence");
+        if (sequenceObj.isNum())
+            nSequence = sequenceObj.get_int();
+
         CTxIn in(COutPoint(txid, nOutput), CScript(), nSequence);
 
         rawTx.vin.push_back(in);