From f3fe83673e84ef4d20b3026faa397cad17212ff8 Mon Sep 17 00:00:00 2001
From: Alex Morcos <morcos@chaincode.com>
Date: Mon, 26 Oct 2015 14:06:06 -0400
Subject: Add a score index to the mempool.

The score index is meant to represent the order of priority for being included in a block for miners.  Initially this is set to the transactions modified (by any feeDelta) fee rate.  Index improvements and unit tests by sdaftuar.
---
 src/test/mempool_tests.cpp | 52 ++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 43 insertions(+), 9 deletions(-)

(limited to 'src/test/mempool_tests.cpp')

diff --git a/src/test/mempool_tests.cpp b/src/test/mempool_tests.cpp
index 896e1237ed..e9f7378f74 100644
--- a/src/test/mempool_tests.cpp
+++ b/src/test/mempool_tests.cpp
@@ -102,12 +102,13 @@ BOOST_AUTO_TEST_CASE(MempoolRemoveTest)
     removed.clear();
 }
 
+template<int index>
 void CheckSort(CTxMemPool &pool, std::vector<std::string> &sortedOrder)
 {
     BOOST_CHECK_EQUAL(pool.size(), sortedOrder.size());
-    CTxMemPool::indexed_transaction_set::nth_index<1>::type::iterator it = pool.mapTx.get<1>().begin();
+    typename CTxMemPool::indexed_transaction_set::nth_index<index>::type::iterator it = pool.mapTx.get<index>().begin();
     int count=0;
-    for (; it != pool.mapTx.get<1>().end(); ++it, ++count) {
+    for (; it != pool.mapTx.get<index>().end(); ++it, ++count) {
         BOOST_CHECK_EQUAL(it->GetTx().GetHash().ToString(), sortedOrder[count]);
     }
 }
@@ -163,7 +164,7 @@ BOOST_AUTO_TEST_CASE(MempoolIndexingTest)
     sortedOrder[2] = tx1.GetHash().ToString(); // 10000
     sortedOrder[3] = tx4.GetHash().ToString(); // 15000
     sortedOrder[4] = tx2.GetHash().ToString(); // 20000
-    CheckSort(pool, sortedOrder);
+    CheckSort<1>(pool, sortedOrder);
 
     /* low fee but with high fee child */
     /* tx6 -> tx7 -> tx8, tx9 -> tx10 */
@@ -175,7 +176,7 @@ BOOST_AUTO_TEST_CASE(MempoolIndexingTest)
     BOOST_CHECK_EQUAL(pool.size(), 6);
     // Check that at this point, tx6 is sorted low
     sortedOrder.insert(sortedOrder.begin(), tx6.GetHash().ToString());
-    CheckSort(pool, sortedOrder);
+    CheckSort<1>(pool, sortedOrder);
 
     CTxMemPool::setEntries setAncestors;
     setAncestors.insert(pool.mapTx.find(tx6.GetHash()));
@@ -201,7 +202,7 @@ BOOST_AUTO_TEST_CASE(MempoolIndexingTest)
     sortedOrder.erase(sortedOrder.begin());
     sortedOrder.push_back(tx6.GetHash().ToString());
     sortedOrder.push_back(tx7.GetHash().ToString());
-    CheckSort(pool, sortedOrder);
+    CheckSort<1>(pool, sortedOrder);
 
     /* low fee child of tx7 */
     CMutableTransaction tx8 = CMutableTransaction();
@@ -216,7 +217,7 @@ BOOST_AUTO_TEST_CASE(MempoolIndexingTest)
 
     // Now tx8 should be sorted low, but tx6/tx both high
     sortedOrder.insert(sortedOrder.begin(), tx8.GetHash().ToString());
-    CheckSort(pool, sortedOrder);
+    CheckSort<1>(pool, sortedOrder);
 
     /* low fee child of tx7 */
     CMutableTransaction tx9 = CMutableTransaction();
@@ -231,7 +232,7 @@ BOOST_AUTO_TEST_CASE(MempoolIndexingTest)
     // tx9 should be sorted low
     BOOST_CHECK_EQUAL(pool.size(), 9);
     sortedOrder.insert(sortedOrder.begin(), tx9.GetHash().ToString());
-    CheckSort(pool, sortedOrder);
+    CheckSort<1>(pool, sortedOrder);
 
     std::vector<std::string> snapshotOrder = sortedOrder;
 
@@ -273,7 +274,7 @@ BOOST_AUTO_TEST_CASE(MempoolIndexingTest)
     sortedOrder.insert(sortedOrder.begin()+5, tx9.GetHash().ToString());
     sortedOrder.insert(sortedOrder.begin()+6, tx8.GetHash().ToString());
     sortedOrder.insert(sortedOrder.begin()+7, tx10.GetHash().ToString()); // tx10 is just before tx6
-    CheckSort(pool, sortedOrder);
+    CheckSort<1>(pool, sortedOrder);
 
     // there should be 10 transactions in the mempool
     BOOST_CHECK_EQUAL(pool.size(), 10);
@@ -281,9 +282,42 @@ BOOST_AUTO_TEST_CASE(MempoolIndexingTest)
     // Now try removing tx10 and verify the sort order returns to normal
     std::list<CTransaction> removed;
     pool.remove(pool.mapTx.find(tx10.GetHash())->GetTx(), removed, true);
-    CheckSort(pool, snapshotOrder);
+    CheckSort<1>(pool, snapshotOrder);
+
+    pool.remove(pool.mapTx.find(tx9.GetHash())->GetTx(), removed, true);
+    pool.remove(pool.mapTx.find(tx8.GetHash())->GetTx(), removed, true);
+    /* Now check the sort on the mining score index.
+     * Final order should be:
+     *
+     * tx7 (2M)
+     * tx2 (20k)
+     * tx4 (15000)
+     * tx1/tx5 (10000)
+     * tx3/6 (0)
+     * (Ties resolved by hash)
+     */
+    sortedOrder.clear();
+    sortedOrder.push_back(tx7.GetHash().ToString());
+    sortedOrder.push_back(tx2.GetHash().ToString());
+    sortedOrder.push_back(tx4.GetHash().ToString());
+    if (tx1.GetHash() < tx5.GetHash()) {
+        sortedOrder.push_back(tx5.GetHash().ToString());
+        sortedOrder.push_back(tx1.GetHash().ToString());
+    } else {
+        sortedOrder.push_back(tx1.GetHash().ToString());
+        sortedOrder.push_back(tx5.GetHash().ToString());
+    }
+    if (tx3.GetHash() < tx6.GetHash()) {
+        sortedOrder.push_back(tx6.GetHash().ToString());
+        sortedOrder.push_back(tx3.GetHash().ToString());
+    } else {
+        sortedOrder.push_back(tx3.GetHash().ToString());
+        sortedOrder.push_back(tx6.GetHash().ToString());
+    }
+    CheckSort<3>(pool, sortedOrder);
 }
 
+
 BOOST_AUTO_TEST_CASE(MempoolSizeLimitTest)
 {
     CTxMemPool pool(CFeeRate(1000));
-- 
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