Return correct error codes in fundrawtransaction().

The fundrawtransaction() RPC was returning misleading or incorrect error
codes (for example RPC_INTERNAL_ERROR when funding the transaction
failed). This commit fixes those error codes:

- RPC_INTERNAL_ERROR should not be returned for application-level
errors, only for genuine internal errors such as corrupted data.

That error code has been replaced with RPC_WALLET_ERROR.

This commit also updates the test cases to explicitly test the error code.

qa/rpc-tests/fundrawtransaction.py

@@ -182,12 +182,7 @@ class RawTransactionsTest(BitcoinTestFramework):
         dec_tx  = self.nodes[2].decoderawtransaction(rawtx)
         assert_equal(utx['txid'], dec_tx['vin'][0]['txid'])
 
-        try:
-            self.nodes[2].fundrawtransaction(rawtx, {'foo': 'bar'})
-            raise AssertionError("Accepted invalid option foo")
-        except JSONRPCException as e:
-            assert("Unexpected key foo" in e.error['message'])
-
+        assert_raises_jsonrpc(-3, "Unexpected key foo", self.nodes[2].fundrawtransaction, rawtx, {'foo':'bar'})
 
         ############################################################
         # test a fundrawtransaction with an invalid change address #
@@ -200,12 +195,7 @@ class RawTransactionsTest(BitcoinTestFramework):
         dec_tx  = self.nodes[2].decoderawtransaction(rawtx)
         assert_equal(utx['txid'], dec_tx['vin'][0]['txid'])
 
-        try:
-            self.nodes[2].fundrawtransaction(rawtx, {'changeAddress': 'foobar'})
-            raise AssertionError("Accepted invalid bitcoin address")
-        except JSONRPCException as e:
-            assert("changeAddress must be a valid bitcoin address" in e.error['message'])
-
+        assert_raises_jsonrpc(-5, "changeAddress must be a valid bitcoin address", self.nodes[2].fundrawtransaction, rawtx, {'changeAddress':'foobar'})
 
         ############################################################
         # test a fundrawtransaction with a provided change address #
@@ -219,12 +209,7 @@ class RawTransactionsTest(BitcoinTestFramework):
         assert_equal(utx['txid'], dec_tx['vin'][0]['txid'])
 
         change = self.nodes[2].getnewaddress()
-        try:
-            rawtxfund = self.nodes[2].fundrawtransaction(rawtx, {'changeAddress': change, 'changePosition': 2})
-        except JSONRPCException as e:
-            assert('changePosition out of bounds' == e.error['message'])
-        else:
-            assert(False)
+        assert_raises_jsonrpc(-8, "changePosition out of bounds", self.nodes[2].fundrawtransaction, rawtx, {'changeAddress':change, 'changePosition':2})
         rawtxfund = self.nodes[2].fundrawtransaction(rawtx, {'changeAddress': change, 'changePosition': 0})
         dec_tx  = self.nodes[2].decoderawtransaction(rawtxfund['hex'])
         out = dec_tx['vout'][0]
@@ -333,12 +318,7 @@ class RawTransactionsTest(BitcoinTestFramework):
         rawtx   = self.nodes[2].createrawtransaction(inputs, outputs)
         dec_tx  = self.nodes[2].decoderawtransaction(rawtx)
 
-        try:
-            rawtxfund = self.nodes[2].fundrawtransaction(rawtx)
-            raise AssertionError("Spent more than available")
-        except JSONRPCException as e:
-            assert("Insufficient" in e.error['message'])
-
+        assert_raises_jsonrpc(-4, "Insufficient funds", self.nodes[2].fundrawtransaction, rawtx)
 
         ############################################################
         #compare fee of a standard pubkeyhash transaction
@@ -494,21 +474,13 @@ class RawTransactionsTest(BitcoinTestFramework):
         rawTx = self.nodes[1].createrawtransaction(inputs, outputs)
         # fund a transaction that requires a new key for the change output
         # creating the key must be impossible because the wallet is locked
-        try:
-            fundedTx = self.nodes[1].fundrawtransaction(rawTx)
-            raise AssertionError("Wallet unlocked without passphrase")
-        except JSONRPCException as e:
-            assert('Keypool ran out' in e.error['message'])
+        assert_raises_jsonrpc(-4, "Insufficient funds", self.nodes[1].fundrawtransaction, rawtx)
 
         #refill the keypool
         self.nodes[1].walletpassphrase("test", 100)
         self.nodes[1].walletlock()
 
-        try:
-            self.nodes[1].sendtoaddress(self.nodes[0].getnewaddress(), 1.2)
-            raise AssertionError("Wallet unlocked without passphrase")
-        except JSONRPCException as e:
-            assert('walletpassphrase' in e.error['message'])
+        assert_raises_jsonrpc(-13, "walletpassphrase", self.nodes[1].sendtoaddress, self.nodes[0].getnewaddress(), 1.2)
 
         oldBalance = self.nodes[0].getbalance()
 

qa/rpc-tests/rawtransactions.py

@@ -61,13 +61,8 @@ class RawTransactionsTest(BitcoinTestFramework):
         rawtx   = self.nodes[2].createrawtransaction(inputs, outputs)
         rawtx   = self.nodes[2].signrawtransaction(rawtx)
 
-        try:
-            rawtx   = self.nodes[2].sendrawtransaction(rawtx['hex'])
-        except JSONRPCException as e:
-            assert("Missing inputs" in e.error['message'])
-        else:
-            assert(False)
-
+        # This will raise an exception since there are missing inputs
+        assert_raises_jsonrpc(-25, "Missing inputs", self.nodes[2].sendrawtransaction, rawtx['hex'])
 
         #########################
         # RAW TX MULTISIG TESTS #
@@ -161,13 +156,13 @@ class RawTransactionsTest(BitcoinTestFramework):
         assert_equal(self.nodes[0].getrawtransaction(txHash, True)["hex"], rawTxSigned['hex'])
 
         # 6. invalid parameters - supply txid and string "Flase"
-        assert_raises(JSONRPCException, self.nodes[0].getrawtransaction, txHash, "Flase")
+        assert_raises_jsonrpc(-3,"Invalid type", self.nodes[0].getrawtransaction, txHash, "Flase")
 
         # 7. invalid parameters - supply txid and empty array
-        assert_raises(JSONRPCException, self.nodes[0].getrawtransaction, txHash, [])
+        assert_raises_jsonrpc(-3,"Invalid type", self.nodes[0].getrawtransaction, txHash, [])
 
         # 8. invalid parameters - supply txid and empty dict
-        assert_raises(JSONRPCException, self.nodes[0].getrawtransaction, txHash, {})
+        assert_raises_jsonrpc(-3,"Invalid type", self.nodes[0].getrawtransaction, txHash, {})
 
         inputs  = [ {'txid' : "1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000", 'vout' : 1, 'sequence' : 1000}]
         outputs = { self.nodes[0].getnewaddress() : 1 }
@@ -175,13 +170,15 @@ class RawTransactionsTest(BitcoinTestFramework):
         decrawtx= self.nodes[0].decoderawtransaction(rawtx)
         assert_equal(decrawtx['vin'][0]['sequence'], 1000)
         
+        # 9. invalid parameters - sequence number out of range
         inputs  = [ {'txid' : "1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000", 'vout' : 1, 'sequence' : -1}]
         outputs = { self.nodes[0].getnewaddress() : 1 }
-        assert_raises(JSONRPCException, self.nodes[0].createrawtransaction, inputs, outputs)
+        assert_raises_jsonrpc(-8, 'Invalid parameter, sequence number is out of range', self.nodes[0].createrawtransaction, inputs, outputs)
         
+        # 10. invalid parameters - sequence number out of range
         inputs  = [ {'txid' : "1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000", 'vout' : 1, 'sequence' : 4294967296}]
         outputs = { self.nodes[0].getnewaddress() : 1 }
-        assert_raises(JSONRPCException, self.nodes[0].createrawtransaction, inputs, outputs)
+        assert_raises_jsonrpc(-8, 'Invalid parameter, sequence number is out of range', self.nodes[0].createrawtransaction, inputs, outputs)
         
         inputs  = [ {'txid' : "1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000", 'vout' : 1, 'sequence' : 4294967294}]
         outputs = { self.nodes[0].getnewaddress() : 1 }

src/wallet/rpcwallet.cpp

@@ -2761,7 +2761,7 @@ UniValue fundrawtransaction(const JSONRPCRequest& request)
     string strFailReason;
 
     if (!pwallet->FundTransaction(tx, nFeeOut, overrideEstimatedFeerate, feeRate, changePosition, strFailReason, includeWatching, lockUnspents, setSubtractFeeFromOutputs, reserveChangeKey, changeAddress)) {
-        throw JSONRPCError(RPC_INTERNAL_ERROR, strFailReason);
+        throw JSONRPCError(RPC_WALLET_ERROR, strFailReason);
     }
 
     UniValue result(UniValue::VOBJ);