avoid adding the same nodes to dht subsys all the time

src/rpcwallet.cpp

@@ -11,6 +11,7 @@
 #include "init.h"
 #include "base58.h"
 #include "main.h"
+#include "twister.h"
 
 using namespace std;
 using namespace boost;
@@ -77,6 +78,7 @@ Value getinfo(const Array& params, bool fHelp)
     obj.push_back(Pair("blocks",        (int)nBestHeight));
     obj.push_back(Pair("timeoffset",    (boost::int64_t)GetTimeOffset()));
     obj.push_back(Pair("connections",   (int)vNodes.size()));
+    obj.push_back(Pair("dht_nodes",     getDhtNodes()));
     obj.push_back(Pair("addrman_total", (int)addrman.size()));
     obj.push_back(Pair("addrman_get",   (int)addrman.GetAddr().size()));
     obj.push_back(Pair("proxy",         (proxy.first.IsValid() ? proxy.first.ToStringIPPort() : string())));

src/twister.cpp

@@ -316,6 +316,14 @@ void saveTorrentResumeData()
     }
 }
 
+int getDhtNodes()
+{
+    if( !ses )
+        return 0;
+    session_status ss = ses->status();
+    return ss.dht_nodes;
+}
+
 void ThreadMaintainDHTNodes()
 {
     RenameThread("maintain-dht-nodes");
@@ -325,20 +333,25 @@ void ThreadMaintainDHTNodes()
     }
 
     int64 lastSaveResumeTime = GetTime();
+    int   lastTotalNodesCandidates = 0;
 
     while(1) {
         session_status ss = ses->status();
         int dht_nodes = ss.dht_nodes;
         bool nodesAdded = false;
         int vNodesSize = 0;
-
-        if( ses ) {
+        {
             LOCK(cs_vNodes);
             vNodesSize = vNodes.size();
+        }
+
+        if( !ses->is_paused() ) {
             vector<CAddress> vAddr = addrman.GetAddr();
             int totalNodesCandidates = (int)(vNodesSize + vAddr.size());
-            if( (!dht_nodes && totalNodesCandidates) ||
-                (dht_nodes < 5 && totalNodesCandidates > 10) ) {
+            if( ((!dht_nodes && totalNodesCandidates) ||
+                 (dht_nodes < 5 && totalNodesCandidates > 10)) &&
+                 totalNodesCandidates != lastTotalNodesCandidates ) {
+                lastTotalNodesCandidates = totalNodesCandidates;
                 printf("ThreadMaintainDHTNodes: too few dht_nodes, trying to add some...\n");
                 BOOST_FOREACH(const CAddress &a, vAddr) {
                     std::string addr = a.ToStringIP();
@@ -347,6 +360,7 @@ void ThreadMaintainDHTNodes()
                     ses->add_dht_node(std::pair<std::string, int>(addr, port));
                     nodesAdded = true;
                 }
+                LOCK(cs_vNodes);
                 BOOST_FOREACH(CNode* pnode, vNodes) {
                     // if !fInbound we created this connection so ip is reachable.
                     // we can't use port number of inbound connection, so try standard port.

src/twister.h

@@ -37,4 +37,6 @@ void receivedSpamMessage(std::string const &message, std::string const &user);
 int getBestHeight();
 bool shouldDhtResourceExpire(std::string resource, bool multi, int height);
 
+int getDhtNodes();
+
 #endif // TWISTER_H