Un-hardcode TX_FEE constants

Allow setting of MIN_TX_FEE / MIN_RELAY_TX_FEE with
-mintxfee / -mintxrelayfee

Default values are the same (0.0001 BTC).

1 files changed, 22 insertions, 0 deletions

diff --git a/src/init.cpp b/src/init.cpp
index 3845cfad81..058b6a06e5 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -583,6 +583,28 @@ bool AppInit2(boost::thread_group& threadGroup)
     const char* pszP2SH = "/P2SH/";
     COINBASE_FLAGS << std::vector<unsigned char>(pszP2SH, pszP2SH+strlen(pszP2SH));
 
+    // Fee-per-kilobyte amount considered the same as "free"
+    // If you are mining, be careful setting this:
+    // if you set it to zero then
+    // a transaction spammer can cheaply fill blocks using
+    // 1-satoshi-fee transactions. It should be set above the real
+    // cost to you of processing a transaction.
+    if (mapArgs.count("-mintxfee"))
+    {
+        int64 n = 0;
+        if (ParseMoney(mapArgs["-mintxfee"], n) && n > 0)
+            CTransaction::nMinTxFee = n;
+        else
+            return InitError(strprintf(_("Invalid amount for -mintxfee=<amount>: '%s'"), mapArgs["-mintxfee"].c_str()));
+    }
+    if (mapArgs.count("-minrelaytxfee"))
+    {
+        int64 n = 0;
+        if (ParseMoney(mapArgs["-minrelaytxfee"], n) && n > 0)
+            CTransaction::nMinRelayTxFee = n;
+        else
+            return InitError(strprintf(_("Invalid amount for -minrelaytxfee=<amount>: '%s'"), mapArgs["-minrelaytxfee"].c_str()));
+    }
 
     if (mapArgs.count("-paytxfee"))
     {