Restrict as much as possible in net_processing to translation unit

Mark everything else static or in an anonymous namespace.

src/net_processing.cpp

@@ -37,9 +37,9 @@
 #endif
 
 /** Expiration time for orphan transactions in seconds */
-static const int64_t ORPHAN_TX_EXPIRE_TIME = 20 * 60;
+static constexpr int64_t ORPHAN_TX_EXPIRE_TIME = 20 * 60;
 /** Minimum time between orphan transactions expire time checks in seconds */
-static const int64_t ORPHAN_TX_EXPIRE_INTERVAL = 5 * 60;
+static constexpr int64_t ORPHAN_TX_EXPIRE_INTERVAL = 5 * 60;
 /** Headers download timeout expressed in microseconds
  *  Timeout = base + per_header * (expected number of headers) */
 static constexpr int64_t HEADERS_DOWNLOAD_TIMEOUT_BASE = 15 * 60 * 1000000; // 15 minutes
@@ -56,27 +56,14 @@ static constexpr int64_t STALE_CHECK_INTERVAL = 10 * 60; // 10 minutes
 static constexpr int64_t EXTRA_PEER_CHECK_INTERVAL = 45;
 /** Minimum time an outbound-peer-eviction candidate must be connected for, in order to evict, in seconds */
 static constexpr int64_t MINIMUM_CONNECT_TIME = 30;
-
-static const uint64_t RANDOMIZER_ID_ADDRESS_RELAY = 0x3cac0035b5866b90ULL; // SHA256("main address relay")[0:8]
-
+/** SHA256("main address relay")[0:8] */
+static constexpr uint64_t RANDOMIZER_ID_ADDRESS_RELAY = 0x3cac0035b5866b90ULL;
 /// Age after which a stale block will no longer be served if requested as
 /// protection against fingerprinting. Set to one month, denominated in seconds.
-static const int STALE_RELAY_AGE_LIMIT = 30 * 24 * 60 * 60;
-
+static constexpr int STALE_RELAY_AGE_LIMIT = 30 * 24 * 60 * 60;
 /// Age after which a block is considered historical for purposes of rate
 /// limiting block relay. Set to one week, denominated in seconds.
-static const int HISTORICAL_BLOCK_AGE = 7 * 24 * 60 * 60;
-
-std::atomic<int64_t> nTimeBestReceived(0); // Used only to inform the wallet of when we last received a block
-
-struct IteratorComparator
-{
-    template<typename I>
-    bool operator()(const I& a, const I& b) const
-    {
-        return &(*a) < &(*b);
-    }
-};
+static constexpr int HISTORICAL_BLOCK_AGE = 7 * 24 * 60 * 60;
 
 struct COrphanTx {
     // When modifying, adapt the copy of this definition in tests/DoS_tests.
@@ -86,14 +73,12 @@ struct COrphanTx {
 };
 static CCriticalSection g_cs_orphans;
 std::map<uint256, COrphanTx> mapOrphanTransactions GUARDED_BY(g_cs_orphans);
-std::map<COutPoint, std::set<std::map<uint256, COrphanTx>::iterator, IteratorComparator>> mapOrphanTransactionsByPrev GUARDED_BY(g_cs_orphans);
+
 void EraseOrphansFor(NodeId peer);
+
 /** Increase a node's misbehavior score. */
 void Misbehaving(NodeId nodeid, int howmuch, const std::string& message="");
 
-static size_t vExtraTxnForCompactIt GUARDED_BY(g_cs_orphans) = 0;
-static std::vector<std::pair<uint256, CTransactionRef>> vExtraTxnForCompact GUARDED_BY(g_cs_orphans);
-
 // Internal stuff
 namespace {
     /** Enable BIP61 (sending reject messages) */
@@ -163,10 +148,24 @@ namespace {
     MapRelay mapRelay;
     /** Expiration-time ordered list of (expire time, relay map entry) pairs, protected by cs_main). */
     std::deque<std::pair<int64_t, MapRelay::iterator>> vRelayExpiration;
+
+    std::atomic<int64_t> nTimeBestReceived(0); // Used only to inform the wallet of when we last received a block
+
+    struct IteratorComparator
+    {
+        template<typename I>
+        bool operator()(const I& a, const I& b) const
+        {
+            return &(*a) < &(*b);
+        }
+    };
+    std::map<COutPoint, std::set<std::map<uint256, COrphanTx>::iterator, IteratorComparator>> mapOrphanTransactionsByPrev GUARDED_BY(g_cs_orphans);
+
+    static size_t vExtraTxnForCompactIt GUARDED_BY(g_cs_orphans) = 0;
+    static std::vector<std::pair<uint256, CTransactionRef>> vExtraTxnForCompact GUARDED_BY(g_cs_orphans);
 } // namespace
 
 namespace {
-
 struct CBlockReject {
     unsigned char chRejectCode;
     std::string strRejectReason;
@@ -293,10 +292,10 @@ struct CNodeState {
 };
 
 /** Map maintaining per-node state. Requires cs_main. */
-std::map<NodeId, CNodeState> mapNodeState;
+static std::map<NodeId, CNodeState> mapNodeState;
 
 // Requires cs_main.
-CNodeState *State(NodeId pnode) {
+static CNodeState *State(NodeId pnode) {
     std::map<NodeId, CNodeState>::iterator it = mapNodeState.find(pnode);
     if (it == mapNodeState.end())
         return nullptr;
@@ -3229,6 +3228,7 @@ void PeerLogicValidation::CheckForStaleTipAndEvictPeers(const Consensus::Params
     }
 }
 
+namespace {
 class CompareInvMempoolOrder
 {
     CTxMemPool *mp;
@@ -3245,6 +3245,7 @@ class CompareInvMempoolOrder
         return mp->CompareDepthAndScore(*b, *a);
     }
 };
+}
 
 bool PeerLogicValidation::SendMessages(CNode* pto, std::atomic<bool>& interruptMsgProc)
 {