CreateTransaction: return strFailReason on failure

src/qt/walletmodel.cpp

@@ -181,7 +181,8 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(const QList<SendCoinsRecipie
         CWalletTx wtx;
         CReserveKey keyChange(wallet);
         int64 nFeeRequired = 0;
-        bool fCreated = wallet->CreateTransaction(vecSend, wtx, keyChange, nFeeRequired);
+        std::string strFailReason;
+        bool fCreated = wallet->CreateTransaction(vecSend, wtx, keyChange, nFeeRequired, strFailReason);
 
         if(!fCreated)
         {
@@ -189,6 +190,8 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(const QList<SendCoinsRecipie
             {
                 return SendCoinsReturn(AmountWithFeeExceedsBalance, nFeeRequired);
             }
+            emit message(tr("Send Coins"), QString::fromStdString(strFailReason),
+                         CClientUIInterface::MSG_ERROR);
             return TransactionCreationFailed;
         }
         if(!uiInterface.ThreadSafeAskFee(nFeeRequired))

src/rpcwallet.cpp

@@ -694,13 +694,10 @@ Value sendmany(const Array& params, bool fHelp)
     // Send
     CReserveKey keyChange(pwalletMain);
     int64 nFeeRequired = 0;
-    bool fCreated = pwalletMain->CreateTransaction(vecSend, wtx, keyChange, nFeeRequired);
+    string strFailReason;
+    bool fCreated = pwalletMain->CreateTransaction(vecSend, wtx, keyChange, nFeeRequired, strFailReason);
     if (!fCreated)
-    {
-        if (totalAmount + nFeeRequired > pwalletMain->GetBalance())
-            throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS, "Insufficient funds");
-        throw JSONRPCError(RPC_WALLET_ERROR, "Transaction creation failed");
-    }
+        throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS, strFailReason);
     if (!pwalletMain->CommitTransaction(wtx, keyChange))
         throw JSONRPCError(RPC_WALLET_ERROR, "Transaction commit failed");
 

src/wallet.cpp

@@ -1134,17 +1134,24 @@ bool CWallet::SelectCoins(int64 nTargetValue, set<pair<const CWalletTx*,unsigned
 
 
 
-bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet)
+bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend,
+                                CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet, std::string& strFailReason)
 {
     int64 nValue = 0;
     BOOST_FOREACH (const PAIRTYPE(CScript, int64)& s, vecSend)
     {
         if (nValue < 0)
+        {
+            strFailReason = _("Transaction amounts must be positive");
             return false;
+        }
         nValue += s.second;
     }
     if (vecSend.empty() || nValue < 0)
+    {
+        strFailReason = _("Transaction amounts must be positive");
         return false;
+    }
 
     wtxNew.BindWallet(this);
 
@@ -1165,7 +1172,10 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CW
                 {
                     CTxOut txout(s.second, s.first);
                     if (txout.IsDust())
+                    {
+                        strFailReason = _("Transaction amount too small");
                         return false;
+                    }
                     wtxNew.vout.push_back(txout);
                 }
 
@@ -1173,7 +1183,10 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CW
                 set<pair<const CWalletTx*,unsigned int> > setCoins;
                 int64 nValueIn = 0;
                 if (!SelectCoins(nTotalValue, setCoins, nValueIn))
+                {
+                    strFailReason = _("Insufficient funds");
                     return false;
+                }
                 BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
                 {
                     int64 nCredit = pcoin.first->vout[pcoin.second].nValue;
@@ -1240,12 +1253,18 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CW
                 int nIn = 0;
                 BOOST_FOREACH(const PAIRTYPE(const CWalletTx*,unsigned int)& coin, setCoins)
                     if (!SignSignature(*this, *coin.first, wtxNew, nIn++))
+                    {
+                        strFailReason = _("Signing transaction failed");
                         return false;
+                    }
 
                 // Limit size
                 unsigned int nBytes = ::GetSerializeSize(*(CTransaction*)&wtxNew, SER_NETWORK, PROTOCOL_VERSION);
                 if (nBytes >= MAX_STANDARD_TX_SIZE)
+                {
+                    strFailReason = _("Transaction too large");
                     return false;
+                }
                 dPriority /= nBytes;
 
                 // Check that enough fee is included
@@ -1269,11 +1288,12 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CW
     return true;
 }
 
-bool CWallet::CreateTransaction(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet)
+bool CWallet::CreateTransaction(CScript scriptPubKey, int64 nValue,
+                                CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet, std::string& strFailReason)
 {
     vector< pair<CScript, int64> > vecSend;
     vecSend.push_back(make_pair(scriptPubKey, nValue));
-    return CreateTransaction(vecSend, wtxNew, reservekey, nFeeRet);
+    return CreateTransaction(vecSend, wtxNew, reservekey, nFeeRet, strFailReason);
 }
 
 // Call after CreateTransaction unless you want to abort
@@ -1339,14 +1359,12 @@ string CWallet::SendMoney(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew,
         printf("SendMoney() : %s", strError.c_str());
         return strError;
     }
-    if (!CreateTransaction(scriptPubKey, nValue, wtxNew, reservekey, nFeeRequired))
+    string strError;
+    if (!CreateTransaction(scriptPubKey, nValue, wtxNew, reservekey, nFeeRequired, strError))
     {
-        string strError;
         if (nValue + nFeeRequired > GetBalance())
             strError = strprintf(_("Error: This transaction requires a transaction fee of at least %s because of its amount, complexity, or use of recently received funds!"), FormatMoney(nFeeRequired).c_str());
-        else
-            strError = _("Error: Transaction creation failed!");
-        printf("SendMoney() : %s", strError.c_str());
+        printf("SendMoney() : %s\n", strError.c_str());
         return strError;
     }
 

src/wallet.h

@@ -178,8 +178,10 @@ public:
     int64 GetBalance() const;
     int64 GetUnconfirmedBalance() const;
     int64 GetImmatureBalance() const;
-    bool CreateTransaction(const std::vector<std::pair<CScript, int64> >& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet);
-    bool CreateTransaction(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet);
+    bool CreateTransaction(const std::vector<std::pair<CScript, int64> >& vecSend,
+                           CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet, std::string& strFailReason);
+    bool CreateTransaction(CScript scriptPubKey, int64 nValue,
+                           CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet, std::string& strFailReason);
     bool CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey);
     std::string SendMoney(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, bool fAskFee=false);
     std::string SendMoneyToDestination(const CTxDestination &address, int64 nValue, CWalletTx& wtxNew, bool fAskFee=false);