Merge bitcoin/bitcoin#25176: Fix frequent -netinfo JSON errors from missing getpeerinfo#relaytxes

a17c5e96b6 Rename NetinfoRequestHandler::is_block_relay data member to is_tx_relay (Jon Atack)
f0bb7db34c Fix frequent -netinfo JSON errors from null getpeerinfo#relaytxes (Jon Atack)

Pull request description:

  CLI -netinfo frequently returns "error: JSON value is not a boolean as expected" since the merge of #21160, which moved fRelayTxes (renamed to m_relay_txs in that pull) from CNodeStats to CNodeStateStats.

  This change made getpeerinfo "relaytxes" an optional field that can return UniValue IsNull(). It is the only optional field consumed by -netinfo where the latter didn't already handle that case. See also https://github.com/bitcoin/bitcoin/pull/24691.

  Also rename the NetinfoRequestHandler::is_block_relay data member to is_tx_relay and inverse its boolean logic. The naming is out of date and incorrect, as lack of request of tx relay does not imply block relay, and a preference for tx relay doesn't imply that block relay isn't happening. Thanks to Marco Falke and Martin Zumsande for their feedback on this.

  (I may look at reducing the number of optional node stats fields via refactoring at the net processing level, but ongoing refactoring there may make that slow or complicated and this is a one-line fix that works now.)

ACKs for top commit:
  mzumsande:
    Code review ACK a17c5e96b6

Tree-SHA512: dc54ce80b78122874a6794555f99e5b328a1574b52bb3e7f974c699c2b759a60ea0807a6483c5bc0414a950d853c0eeeb13dcc1b790d3917c6ee4c9c99fe159f

src/bitcoin-cli.cpp

@@ -412,8 +412,8 @@ private:
         bool is_addr_relay_enabled;
         bool is_bip152_hb_from;
         bool is_bip152_hb_to;
-        bool is_block_relay;
         bool is_outbound;
+        bool is_tx_relay;
         bool operator<(const Peer& rhs) const { return std::tie(is_outbound, min_ping) < std::tie(rhs.is_outbound, rhs.min_ping); }
     };
     std::vector<Peer> m_peers;
@@ -477,7 +477,7 @@ public:
             const int8_t network_id{NetworkStringToId(network)};
             if (network_id == UNKNOWN_NETWORK) continue;
             const bool is_outbound{!peer["inbound"].get_bool()};
-            const bool is_block_relay{!peer["relaytxes"].get_bool()};
+            const bool is_tx_relay{peer["relaytxes"].isNull() ? true : peer["relaytxes"].get_bool()};
             const std::string conn_type{peer["connection_type"].get_str()};
             ++m_counts.at(is_outbound).at(network_id);      // in/out by network
             ++m_counts.at(is_outbound).at(NETWORKS.size()); // in/out overall
@@ -505,7 +505,7 @@ public:
                 const bool is_addr_relay_enabled{peer["addr_relay_enabled"].isNull() ? false : peer["addr_relay_enabled"].get_bool()};
                 const bool is_bip152_hb_from{peer["bip152_hb_from"].get_bool()};
                 const bool is_bip152_hb_to{peer["bip152_hb_to"].get_bool()};
-                m_peers.push_back({addr, sub_version, conn_type, network, age, min_ping, ping, addr_processed, addr_rate_limited, last_blck, last_recv, last_send, last_trxn, peer_id, mapped_as, version, is_addr_relay_enabled, is_bip152_hb_from, is_bip152_hb_to, is_block_relay, is_outbound});
+                m_peers.push_back({addr, sub_version, conn_type, network, age, min_ping, ping, addr_processed, addr_rate_limited, last_blck, last_recv, last_send, last_trxn, peer_id, mapped_as, version, is_addr_relay_enabled, is_bip152_hb_from, is_bip152_hb_to, is_outbound, is_tx_relay});
                 m_max_addr_length = std::max(addr.length() + 1, m_max_addr_length);
                 m_max_addr_processed_length = std::max(ToString(addr_processed).length(), m_max_addr_processed_length);
                 m_max_addr_rate_limited_length = std::max(ToString(addr_rate_limited).length(), m_max_addr_rate_limited_length);
@@ -538,7 +538,7 @@ public:
                     PingTimeToString(peer.ping),
                     peer.last_send ? ToString(time_now - peer.last_send) : "",
                     peer.last_recv ? ToString(time_now - peer.last_recv) : "",
-                    peer.last_trxn ? ToString((time_now - peer.last_trxn) / 60) : peer.is_block_relay ? "*" : "",
+                    peer.last_trxn ? ToString((time_now - peer.last_trxn) / 60) : peer.is_tx_relay ? "" : "*",
                     peer.last_blck ? ToString((time_now - peer.last_blck) / 60) : "",
                     strprintf("%s%s", peer.is_bip152_hb_to ? "." : " ", peer.is_bip152_hb_from ? "*" : " "),
                     m_max_addr_processed_length, // variable spacing