Merge bitcoin#20786: net: [refactor] Prefer integral types in CNodeStats

faecb74 Expose integral m_conn_type in CNodeStats, remove m_conn_type_string (Jon Atack)

Pull request description:

  Currently, strings are stored for what are actually integral (strong) enum types. This is fine, because the strings are only used as-is for the debug log and RPC. However, it complicates using them in the GUI. User facing strings in the GUI should be translated and only string literals can be picked up for translation, not runtime `std::string`s.

  Fix that by removing the `std::string` members and replace them by strong enum integral types.

ACKs for top commit:
  jonatack:
    Code review ACK faecb74
  theStack:
    Code review ACK faecb74 🌲

Tree-SHA512: 24df2bd0645432060e393eb44b8abaf20fe296457d07a867b0e735c3e2e75af7b03fc6bfeca734ec33ab816a7c8e1f8591a5ec342f3afe3098a4e41f5c2cfebb

src/net.cpp

@@ -588,9 +588,9 @@ bool CNode::IsBlockRelayOnly() const {
     return (ignores_incoming_txs && !HasPermission(NetPermissionFlags::Relay)) || IsBlockOnlyConn();
 }
 
-std::string CNode::ConnectionTypeAsString() const
+std::string ConnectionTypeAsString(ConnectionType conn_type)
 {
-    switch (m_conn_type) {
+    switch (conn_type) {
     case ConnectionType::INBOUND:
         return "inbound";
     case ConnectionType::MANUAL:
@@ -700,7 +700,7 @@ void CNode::copyStats(CNodeStats &stats, const std::vector<bool> &m_asmap)
         X(verifiedPubKeyHash);
     }
     X(m_masternode_connection);
-    stats.m_conn_type_string = ConnectionTypeAsString();
+    X(m_conn_type);
 }
 #undef X
 

src/net.h

@@ -213,6 +213,8 @@ enum class ConnectionType {
     ADDR_FETCH,
 };
 
+/** Convert ConnectionType enum to a string value */
+std::string ConnectionTypeAsString(ConnectionType conn_type);
 void Discover();
 uint16_t GetListenPort();
 
@@ -307,7 +309,7 @@ class CNodeStats
     // In case this is a verified MN, this value is the hashed operator pubkey of the MN
     uint256 verifiedPubKeyHash;
     bool m_masternode_connection;
-    std::string m_conn_type_string;
+    ConnectionType m_conn_type;
 };
 
 
@@ -733,7 +735,7 @@ class CNode
     void MaybeSetAddrName(const std::string& addrNameIn);
 
 
-    std::string ConnectionTypeAsString() const;
+    std::string ConnectionTypeAsString() const { return ::ConnectionTypeAsString(m_conn_type); }
 
     /** A ping-pong round trip has completed successfully. Update latest and minimum ping times. */
     void PongReceived(std::chrono::microseconds ping_time) {

src/rpc/net.cpp

@@ -282,7 +282,7 @@ static RPCHelpMan getpeerinfo()
                 recvPerMsgCmd.pushKV(i.first, i.second);
         }
         obj.pushKV("bytesrecv_per_msg", recvPerMsgCmd);
-        obj.pushKV("connection_type", stats.m_conn_type_string);
+        obj.pushKV("connection_type", ConnectionTypeAsString(stats.m_conn_type));
 
         ret.push_back(obj);
     }