Merge pull request #6380

9127e97 doc: Mention RPC strings for monetary amounts in release notes (Wladimir J. van der Laan)
7d226b7 [QA] add testcases for parsing strings as values (Jonas Schnelli)
614601b rpc: Accept strings in AmountFromValue (Wladimir J. van der Laan)

doc/release-notes.md

@@ -19,10 +19,13 @@ https://www.torproject.org/docs/tor-manual.html.en
 
 This allows running bitcoind without having to do any manual configuration.
 
-Example header
+Low-level RPC API changes
-----------------------
+--------------------------
 
-Example content.
+- Monetary amounts can be provided as strings. This means that for example the
+  argument to sendtoaddress can be "0.0001" instead of 0.0001. This can be an
+  advantage if a JSON library insists on using a lossy floating point type for
+  numbers, which would be dangerous for monetary amounts.
 
 0.12.0 Change log
 =================

qa/rpc-tests/wallet.py

@@ -218,5 +218,37 @@ class WalletTest (BitcoinTestFramework):
         #tx should be added to balance because after restarting the nodes tx should be broadcastet
         assert_equal(self.nodes[2].getbalance(), Decimal('63.99800000')); #should not be
 
+        #send a tx with value in a string (PR#6380 +)
+        txId  = self.nodes[0].sendtoaddress(self.nodes[2].getnewaddress(), "2")
+        txObj = self.nodes[0].gettransaction(txId)
+        assert_equal(txObj['amount'], Decimal('-2.00000000'))
+
+        txId  = self.nodes[0].sendtoaddress(self.nodes[2].getnewaddress(), "0.0001")
+        txObj = self.nodes[0].gettransaction(txId)
+        assert_equal(txObj['amount'], Decimal('-0.00010000'))
+
+        #check if JSON parser can handle scientific notation in strings
+        txId  = self.nodes[0].sendtoaddress(self.nodes[2].getnewaddress(), "1e-4")
+        txObj = self.nodes[0].gettransaction(txId)
+        assert_equal(txObj['amount'], Decimal('-0.00010000'))
+
+        #this should fail
+        errorString = ""
+        try:
+            txId  = self.nodes[0].sendtoaddress(self.nodes[2].getnewaddress(), "1f-4")
+        except JSONRPCException,e:
+            errorString = e.error['message']
+
+        assert_equal("Invalid amount" in errorString, True);
+
+        errorString = ""
+        try:
+            self.nodes[0].generate("2") #use a string to as block amount parameter must fail because it's not interpreted as amount
+        except JSONRPCException,e:
+            errorString = e.error['message']
+
+        assert_equal("not an integer" in errorString, True);
+
+
 if __name__ == '__main__':
     WalletTest ().main ()

src/rpcserver.cpp

@@ -120,8 +120,8 @@ void RPCTypeCheckObj(const UniValue& o,
 
 CAmount AmountFromValue(const UniValue& value)
 {
-    if (!value.isNum())
+    if (!value.isNum() && !value.isStr())
-        throw JSONRPCError(RPC_TYPE_ERROR, "Amount is not a number");
+        throw JSONRPCError(RPC_TYPE_ERROR, "Amount is not a number or string");
     CAmount amount;
     if (!ParseFixedPoint(value.getValStr(), 8, &amount))
         throw JSONRPCError(RPC_TYPE_ERROR, "Invalid amount");