From adf0313ab85ad0afb850eeee2af009f0beeb767a Mon Sep 17 00:00:00 2001
From: JoelKatz <DavidJoelSchwartz@GMail.com>
Date: Sun, 22 Apr 2012 16:27:55 -0700
Subject: [PATCH] Transaction fee handling.

---
 src/TransactionEngine.cpp | 52 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 50 insertions(+), 2 deletions(-)

diff --git a/src/TransactionEngine.cpp b/src/TransactionEngine.cpp
index 34a77ace8d..7d5d8b62d0 100644
--- a/src/TransactionEngine.cpp
+++ b/src/TransactionEngine.cpp
@@ -15,7 +15,12 @@ TransactionEngineResult TransactionEngine::applyTransaction(const SerializedTran
 	// check signature
 	if (!txn.checkSign(acctKey)) return terINVALID;
 
-	// WRITEME: Check fee
+	uint64 txnFee = txn.getTransactionFee();
+	if ( (params & tepNO_CHECK_FEE) != tepNONE)
+	{
+		// WRITEME: Check if fee is adequate
+		if (txnFee == 0) return terINSUF_FEE_P;
+	}
 
 	// get source account ID
 	uint160 srcAccount = txn.getSigningAccount();
@@ -26,7 +31,14 @@ TransactionEngineResult TransactionEngine::applyTransaction(const SerializedTran
 	// find source account
 	LedgerStateParms qry = lepNONE;
 	SerializedLedgerEntry::pointer src = mLedger->getAccountRoot(qry, srcAccount);
-	if(!src) return terNO_ACCOUNT;
+	if (!src) return terNO_ACCOUNT;
+
+	// deduct the fee, so it's not available during the transaction
+	// we only write the account back if the transaction succeeds
+	uint64 balance = src->getIFieldU64(sfBalance);
+	if (balance < txnFee)
+		return terINSUF_FEE_B;
+	src->setIFieldU64(sfBalance, balance - txnFee);
 
 	// validate sequence
 	uint32 t_seq = txn.getSequence();
@@ -81,3 +93,39 @@ TransactionEngineResult TransactionEngine::applyTransaction(const SerializedTran
 
 	return result;
 }
+
+TransactionEngineResult TransactionEngine::doPayment(const SerializedTransaction& txn, SerializedLedgerEntry& source)
+{
+	return terUNKNOWN;
+}
+
+TransactionEngineResult TransactionEngine::doInvoice(const SerializedTransaction&, SerializedLedgerEntry& source)
+{
+	return terUNKNOWN;
+}
+
+TransactionEngineResult TransactionEngine::doOffer(const SerializedTransaction&, SerializedLedgerEntry& source)
+{
+	return terUNKNOWN;
+}
+
+TransactionEngineResult TransactionEngine::doTake(const SerializedTransaction&, SerializedLedgerEntry& source)
+{
+	return terUNKNOWN;
+}
+
+TransactionEngineResult TransactionEngine::doCancel(const SerializedTransaction&, SerializedLedgerEntry& source)
+{
+	return terUNKNOWN;
+}
+
+TransactionEngineResult TransactionEngine::doStore(const SerializedTransaction&, SerializedLedgerEntry& source)
+{
+	return terUNKNOWN;
+}
+
+TransactionEngineResult TransactionEngine::doDelete(const SerializedTransaction&, SerializedLedgerEntry& source)
+{
+	return terUNKNOWN;
+}
+