Merge #7350: Banlist updates

e8600c9 banlist (bugfix): allow CNode::SweepBanned() to run on interval (Philip Kaufmann)
2977c24 banlist: add more banlist infos to log / add GUI signal (Philip Kaufmann)
ce479aa banlist: better handling of banlist in StartNode() (Philip Kaufmann)
57c77fe banlist: update set dirty to be more fine grained (Philip Kaufmann)

src/net.cpp

@@ -38,7 +38,7 @@
 
 #include <math.h>
 
-// Dump addresses to peers.dat every 15 minutes (900s)
+// Dump addresses to peers.dat and banlist.dat every 15 minutes (900s)
 #define DUMP_ADDRESSES_INTERVAL 900
 
 #if !defined(HAVE_MSG_NOSIGNAL) && !defined(MSG_NOSIGNAL)
@@ -573,11 +573,13 @@ void CNode::SweepBanned()
     banmap_t::iterator it = setBanned.begin();
     while(it != setBanned.end())
     {
+        CSubNet subNet = (*it).first;
         CBanEntry banEntry = (*it).second;
         if(now > banEntry.nBanUntil)
         {
             setBanned.erase(it++);
             setBannedIsDirty = true;
+            LogPrint("net", "%s: Removed banned node ip/subnet from banlist.dat: %s\n", __func__, subNet.ToString());
         }
         else
             ++it;
@@ -1492,12 +1494,7 @@ void DumpAddresses()
 void DumpData()
 {
     DumpAddresses();
-
-    if (CNode::BannedSetIsDirty())
-    {
-        DumpBanlist();
-        CNode::SetBannedSetDirty(false);
-    }
+    DumpBanlist();
 }
 
 void static ProcessOneShot()
@@ -1938,31 +1935,36 @@ void static Discover(boost::thread_group& threadGroup)
 void StartNode(boost::thread_group& threadGroup, CScheduler& scheduler)
 {
     uiInterface.InitMessage(_("Loading addresses..."));
-    // Load addresses for peers.dat
+    // Load addresses from peers.dat
     int64_t nStart = GetTimeMillis();
     {
         CAddrDB adb;
-        if (!adb.Read(addrman))
+        if (adb.Read(addrman))
+            LogPrintf("Loaded %i addresses from peers.dat  %dms\n", addrman.size(), GetTimeMillis() - nStart);
+        else
             LogPrintf("Invalid or missing peers.dat; recreating\n");
     }
 
-    //try to read stored banlist
+    uiInterface.InitMessage(_("Loading banlist..."));
+    // Load addresses from banlist.dat
+    nStart = GetTimeMillis();
     CBanDB bandb;
     banmap_t banmap;
-    if (!bandb.Read(banmap))
+    if (bandb.Read(banmap)) {
+        CNode::SetBanned(banmap); // thread save setter
+        CNode::SetBannedSetDirty(false); // no need to write down, just read data
+        CNode::SweepBanned(); // sweep out unused entries
+
+        LogPrint("net", "Loaded %d banned node ips/subnets from banlist.dat  %dms\n",
+            banmap.size(), GetTimeMillis() - nStart);
+    } else
         LogPrintf("Invalid or missing banlist.dat; recreating\n");
 
-    CNode::SetBanned(banmap); //thread save setter
-    CNode::SetBannedSetDirty(false); //no need to write down just read or nonexistent data
-    CNode::SweepBanned(); //sweap out unused entries
-
-    LogPrintf("Loaded %i addresses from peers.dat  %dms\n",
-           addrman.size(), GetTimeMillis() - nStart);
     fAddressesInitialized = true;
 
     if (semOutbound == NULL) {
         // initialize semaphore
-        int nMaxOutbound = min(MAX_OUTBOUND_CONNECTIONS, nMaxConnections);
+        int nMaxOutbound = std::min(MAX_OUTBOUND_CONNECTIONS, nMaxConnections);
         semOutbound = new CSemaphore(nMaxOutbound);
     }
 
@@ -2609,30 +2611,34 @@ bool CBanDB::Read(banmap_t& banSet)
         // ... verify the network matches ours
         if (memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp)))
             return error("%s: Invalid network magic number", __func__);
-        
+
         // de-serialize address data into one CAddrMan object
         ssBanlist >> banSet;
     }
     catch (const std::exception& e) {
         return error("%s: Deserialize or I/O error - %s", __func__, e.what());
     }
-    
+
     return true;
 }
 
 void DumpBanlist()
 {
-    int64_t nStart = GetTimeMillis();
+    CNode::SweepBanned(); // clean unused entries (if bantime has expired)
 
-    CNode::SweepBanned(); //clean unused entries (if bantime has expired)
+    if (!CNode::BannedSetIsDirty())
+        return;
+
+    int64_t nStart = GetTimeMillis();
 
     CBanDB bandb;
     banmap_t banmap;
     CNode::GetBanned(banmap);
-    bandb.Write(banmap);
+    if (bandb.Write(banmap))
+        CNode::SetBannedSetDirty(false);
 
     LogPrint("net", "Flushed %d banned node ips/subnets to banlist.dat  %dms\n",
-             banmap.size(), GetTimeMillis() - nStart);
+        banmap.size(), GetTimeMillis() - nStart);
 }
 
 int64_t PoissonNextSend(int64_t nNow, int average_interval_seconds) {