Add missing const to CAddrMan::Check_()

Also: Always compile the function signature to avoid similar issues in
the future.

Author: MarcoFalke

src/addrman.cpp

@@ -431,9 +431,9 @@ CAddrInfo CAddrMan::Select_(bool newOnly) const
     }
 }
 
-#ifdef DEBUG_ADDRMAN
-int CAddrMan::Check_()
+int CAddrMan::Check_() const
 {
+#ifdef DEBUG_ADDRMAN
     AssertLockHeld(cs);
 
     std::unordered_set<int> setTried;
@@ -458,8 +458,10 @@ int CAddrMan::Check_()
                 return -4;
             mapNew[n] = info.nRefCount;
         }
-        if (mapAddr[info] != n)
+        const auto it{mapAddr.find(info)};
+        if (it == mapAddr.end() || it->second != n) {
             return -5;
+        }
         if (info.nRandomPos < 0 || (size_t)info.nRandomPos >= vRandom.size() || vRandom[info.nRandomPos] != n)
             return -14;
         if (info.nLastTry < 0)
@@ -478,10 +480,13 @@ int CAddrMan::Check_()
             if (vvTried[n][i] != -1) {
                 if (!setTried.count(vvTried[n][i]))
                     return -11;
-                if (mapInfo[vvTried[n][i]].GetTriedBucket(nKey, m_asmap) != n)
+                const auto it{mapInfo.find(vvTried[n][i])};
+                if (it == mapInfo.end() || it->second.GetTriedBucket(nKey, m_asmap) != n) {
                     return -17;
-                if (mapInfo[vvTried[n][i]].GetBucketPosition(nKey, false, n) != i)
+                }
+                if (it->second.GetBucketPosition(nKey, false, n) != i) {
                     return -18;
+                }
                 setTried.erase(vvTried[n][i]);
             }
         }
@@ -492,8 +497,10 @@ int CAddrMan::Check_()
             if (vvNew[n][i] != -1) {
                 if (!mapNew.count(vvNew[n][i]))
                     return -12;
-                if (mapInfo[vvNew[n][i]].GetBucketPosition(nKey, true, n) != i)
+                const auto it{mapInfo.find(vvNew[n][i])};
+                if (it == mapInfo.end() || it->second.GetBucketPosition(nKey, true, n) != i) {
                     return -19;
+                }
                 if (--mapNew[vvNew[n][i]] == 0)
                     mapNew.erase(vvNew[n][i]);
             }
@@ -507,9 +514,9 @@ int CAddrMan::Check_()
     if (nKey.IsNull())
         return -16;
 
+#endif // DEBUG_ADDRMAN
     return 0;
 }
-#endif
 
 void CAddrMan::GetAddr_(std::vector<CAddress>& vAddr, size_t max_addresses, size_t max_pct, std::optional<Network> network) const
 {

src/addrman.h

@@ -738,19 +738,15 @@ class CAddrMan
     void Check() const
         EXCLUSIVE_LOCKS_REQUIRED(cs)
     {
-#ifdef DEBUG_ADDRMAN
         AssertLockHeld(cs);
         const int err = Check_();
         if (err) {
             LogPrintf("ADDRMAN CONSISTENCY CHECK FAILED!!! err=%i\n", err);
         }
-#endif
     }
 
-#ifdef DEBUG_ADDRMAN
     //! Perform consistency check. Returns an error code or zero.
     int Check_() const EXCLUSIVE_LOCKS_REQUIRED(cs);
-#endif
 
     /**
      * Return all or many randomly selected addresses, optionally by network.