Add Dogecoin current fee calculation logic (#1413)

Introduces 1 COIN/kb fees, rounded up to the next 1 COIN.

1 files changed, 44 insertions, 0 deletions

diff --git a/src/dogecoin.cpp b/src/dogecoin.cpp
index f06849d61..b34437ca0 100644
--- a/src/dogecoin.cpp
+++ b/src/dogecoin.cpp
@@ -5,9 +5,12 @@
 #include <boost/random/uniform_int.hpp>
 #include <boost/random/mersenne_twister.hpp>
 
+#include "policy/policy.h"
 #include "arith_uint256.h"
 #include "dogecoin.h"
+#include "txmempool.h"
 #include "util.h"
+#include "validation.h"
 
 int static generateMTRandom(unsigned int s, int range)
 {
@@ -142,3 +145,44 @@ CAmount GetDogecoinBlockSubsidy(int nHeight, const Consensus::Params& consensusP
         return 10000 * COIN;
     }
 }
+
+CAmount GetDogecoinMinRelayFee(const CTransaction& tx, unsigned int nBytes, bool fAllowFree)
+{
+    {
+        LOCK(mempool.cs);
+        uint256 hash = tx.GetHash();
+        double dPriorityDelta = 0;
+        CAmount nFeeDelta = 0;
+        mempool.ApplyDeltas(hash, dPriorityDelta, nFeeDelta);
+        if (dPriorityDelta > 0 || nFeeDelta > 0)
+            return 0;
+    }
+
+    CAmount nMinFee = ::minRelayTxFee.GetFee(nBytes);
+    nMinFee += GetDogecoinDustFee(tx.vout, ::minRelayTxFee);
+
+    if (fAllowFree)
+    {
+        // There is a free transaction area in blocks created by most miners,
+        // * If we are relaying we allow transactions up to DEFAULT_BLOCK_PRIORITY_SIZE - 1000
+        //   to be considered to fall into this category. We don't want to encourage sending
+        //   multiple transactions instead of one big transaction to avoid fees.
+        if (nBytes < (DEFAULT_BLOCK_PRIORITY_SIZE - 1000))
+            nMinFee = 0;
+    }
+
+    if (!MoneyRange(nMinFee))
+        nMinFee = MAX_MONEY;
+    return nMinFee;
+}
+
+CAmount GetDogecoinDustFee(const std::vector<CTxOut> &vout, CFeeRate &baseFeeRate) {
+    CAmount nFee = 0;
+
+    // To limit dust spam, add base fee for each output less than DUST_SOFT_LIMIT
+    BOOST_FOREACH(const CTxOut& txout, vout)
+        if (txout.IsDust(::minRelayTxFee))
+            nFee += baseFeeRate.GetFeePerK();
+
+    return nFee;
+}