From 1317cd1928afbae14fedb39c8d23589a32fe2951 Mon Sep 17 00:00:00 2001
From: Patrick Strateman <patrick.strateman@gmail.com>
Date: Thu, 20 Aug 2015 17:29:04 -0700
Subject: [PATCH] RAII wrapper for CNode*

---
 src/net.cpp | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/src/net.cpp b/src/net.cpp
index d8d2783c4..709c65243 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -775,12 +775,23 @@ void SocketSendData(CNode *pnode)
 
 static list<CNode*> vNodesDisconnected;
 
-static bool ReverseCompareNodeMinPingTime(CNode *a, CNode *b)
+class CNodeRef {
+public:
+    CNodeRef(CNode *pnode) : _pnode(pnode)  {_pnode->AddRef();}
+    ~CNodeRef() {_pnode->Release();}
+
+    CNode& operator *() const {return *_pnode;};
+    CNode* operator ->() const {return _pnode;};
+private:
+    CNode *_pnode;
+};
+
+static bool ReverseCompareNodeMinPingTime(const CNodeRef &a, const CNodeRef &b)
 {
     return a->nMinPingUsecTime > b->nMinPingUsecTime;
 }
 
-static bool ReverseCompareNodeTimeConnected(CNode *a, CNode *b)
+static bool ReverseCompareNodeTimeConnected(const CNodeRef &a, const CNodeRef &b)
 {
     return a->nTimeConnected > b->nTimeConnected;
 }
@@ -795,7 +806,7 @@ public:
         GetRandBytes(vchSecretKey.data(), vchSecretKey.size());
     }
 
-    bool operator()(CNode *a, CNode *b)
+    bool operator()(const CNodeRef &a, const CNodeRef &b)
     {
         std::vector<unsigned char> vchGroupA, vchGroupB;
         CSHA256 hashA, hashB;
@@ -818,7 +829,7 @@ public:
 };
 
 static bool AttemptToEvictConnection(bool fPreferNewConnection) {
-    std::vector<CNode*> vEvictionCandidates;
+    std::vector<CNodeRef> vEvictionCandidates;
     {
         LOCK(cs_vNodes);
 
@@ -831,7 +842,7 @@ static bool AttemptToEvictConnection(bool fPreferNewConnection) {
                 continue;
             if (node->addr.IsLocal())
                 continue;
-            vEvictionCandidates.push_back(node);
+            vEvictionCandidates.push_back(CNodeRef(node));
         }
     }
 
@@ -859,8 +870,8 @@ static bool AttemptToEvictConnection(bool fPreferNewConnection) {
     // Identify CNetAddr with the most connections
     CNetAddr naMostConnections;
     unsigned int nMostConnections = 0;
-    std::map<CNetAddr, std::vector<CNode*> > mapAddrCounts;
-    BOOST_FOREACH(CNode *node, vEvictionCandidates) {
+    std::map<CNetAddr, std::vector<CNodeRef> > mapAddrCounts;
+    BOOST_FOREACH(const CNodeRef &node, vEvictionCandidates) {
         mapAddrCounts[node->addr].push_back(node);
 
         if (mapAddrCounts[node->addr].size() > nMostConnections) {