Back off for 1m when connecting to quorum masternodes (#2975)

* Implement GetAddressInfo in CAddrMan

* Back off for 1m when connecting to quorum masternodes

src/addrman.cpp

@@ -533,6 +533,23 @@ void CAddrMan::SetServices_(const CService& addr, ServiceFlags nServices)
     info.nServices = nServices;
 }
 
+CAddrInfo CAddrMan::GetAddressInfo_(const CService& addr)
+{
+    CAddrInfo* pinfo = Find(addr);
+
+    // if not found, bail out
+    if (!pinfo)
+        return CAddrInfo();
+
+    CAddrInfo& info = *pinfo;
+
+    // check whether we are talking about the exact same CService (including same port)
+    if (info != addr)
+        return CAddrInfo();
+
+    return *pinfo;
+}
+
 int CAddrMan::RandomInt(int nMax){
     return GetRandInt(nMax);
 }

src/addrman.h

@@ -265,6 +265,9 @@ protected:
     //! Update an entry's service bits.
     void SetServices_(const CService &addr, ServiceFlags nServices);
 
+    //! Get address info for address
+    CAddrInfo GetAddressInfo_(const CService& addr);
+
 public:
     /**
      * serialized format:
@@ -593,6 +596,18 @@ public:
         Check();
     }
 
+    CAddrInfo GetAddressInfo(const CService& addr)
+    {
+        CAddrInfo addrRet;
+        {
+            LOCK(cs);
+            Check();
+            addrRet = GetAddressInfo_(addr);
+            Check();
+        }
+        return addrRet;
+    }
+
 };
 
 #endif // BITCOIN_ADDRMAN_H

src/net.cpp

@@ -2070,6 +2070,8 @@ void CConnman::ThreadOpenMasternodeConnections()
         if (interruptNet)
             return;
 
+        int64_t nANow = GetAdjustedTime();
+
         // NOTE: Process only one pending masternode at a time
 
         CService addr;
@@ -2085,6 +2087,11 @@ void CConnman::ThreadOpenMasternodeConnections()
                     }
                     const auto& addr2 = dmn->pdmnState->addr;
                     if (!connectedNodes.count(addr2) && !IsMasternodeOrDisconnectRequested(addr2) && !connectedProRegTxHashes.count(proRegTxHash)) {
+                        auto addrInfo = addrman.GetAddressInfo(addr2);
+                        // back off trying connecting to an address if we already tried recently
+                        if (addrInfo.IsValid() && nANow - addrInfo.nLastTry < 60) {
+                            continue;
+                        }
                         pending.emplace_back(addr2);
                     }
                 }