Merge bitcoin/bitcoin#27499: net processing, refactor: Decouple PeerManager from gArgs

23c7b51ddd2888cf7fb260c439f004bd28768473 [net processing] Move -capturemessages to PeerManager::Options (dergoegge)
bd59bda26b67b53293a5cef7433e992203da325a [net processing] Move -blockreconstructionextratxn to PeerManager::Options (dergoegge)
567c4e0b6a3fadd2fd1be732076026bf491519b2 [net processing] Move -maxorphantx to PeerManager::Options (dergoegge)
fa9e6d80d1c55f8b1bb2691bfd67e8c2b7189b38 [net processing] Move -txreconciliation to PeerManager::Options (dergoegge)
4cfb7b925f8fea818f03433882138a7d3d7e179a [net processing] Use ignore_incoming_txs from m_opts (dergoegge)
8b877259217c6da316153afb136a55c2dbd401c2 [net processing] Introduce PeerManager options (dergoegge)

Pull request description:

  This PR decouples `PeerManager` from our global args manager by introducing `PeerManager::Options`.

ACKs for top commit:
  stickies-v:
    re-ACK 23c7b51ddd2888cf7fb260c439f004bd28768473
  TheCharlatan:
    ACK 23c7b51ddd2888cf7fb260c439f004bd28768473

Tree-SHA512: cd807b36ec018010e11935d3539fa7ed5015fdfb531d13a042a65b54ee8533a35a919a6a6c5fa293b5cba76000e9403c64dfd790fb9c649b7838544929b1fee8

9 files changed, 87 insertions, 37 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index e1ae049b15..aba6f00756 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -224,6 +224,7 @@ BITCOIN_CORE_H = \
   node/miner.h \
   node/mini_miner.h \
   node/minisketchwrapper.h \
+  node/peerman_args.h \
   node/psbt.h \
   node/transaction.h \
   node/txreconciliation.h \
@@ -421,6 +422,7 @@ libbitcoin_node_a_SOURCES = \
   node/miner.cpp \
   node/mini_miner.cpp \
   node/minisketchwrapper.cpp \
+  node/peerman_args.cpp \
   node/psbt.cpp \
   node/transaction.cpp \
   node/txreconciliation.cpp \
diff --git a/src/init.cpp b/src/init.cpp
index f726fe54ca..997996ef12 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -50,7 +50,7 @@
 #include <node/mempool_args.h>
 #include <node/mempool_persist_args.h>
 #include <node/miner.h>
-#include <node/txreconciliation.h>
+#include <node/peerman_args.h>
 #include <node/validation_cache_args.h>
 #include <policy/feerate.h>
 #include <policy/fees.h>
@@ -1539,9 +1539,16 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
 
     ChainstateManager& chainman = *Assert(node.chainman);
 
+
+    PeerManager::Options peerman_opts{
+        .ignore_incoming_txs = ignores_incoming_txs,
+    };
+    ApplyArgsManOptions(args, peerman_opts);
+
     assert(!node.peerman);
-    node.peerman = PeerManager::make(*node.connman, *node.addrman, node.banman.get(),
-                                     chainman, *node.mempool, ignores_incoming_txs);
+    node.peerman = PeerManager::make(*node.connman, *node.addrman,
+                                     node.banman.get(), chainman,
+                                     *node.mempool, peerman_opts);
     RegisterValidationInterface(node.peerman.get());
 
     // ********************************************************* Step 8: start indexers
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 8da2c701d3..be6777d14b 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -10,7 +10,6 @@
 #include <blockencodings.h>
 #include <blockfilter.h>
 #include <chainparams.h>
-#include <common/args.h>
 #include <consensus/amount.h>
 #include <consensus/validation.h>
 #include <deploymentstatus.h>
@@ -487,7 +486,7 @@ class PeerManagerImpl final : public PeerManager
 public:
     PeerManagerImpl(CConnman& connman, AddrMan& addrman,
                     BanMan* banman, ChainstateManager& chainman,
-                    CTxMemPool& pool, bool ignore_incoming_txs);
+                    CTxMemPool& pool, Options opts);
 
     /** Overridden from CValidationInterface. */
     void BlockConnected(const std::shared_ptr<const CBlock>& pblock, const CBlockIndex* pindexConnected) override
@@ -515,7 +514,7 @@ public:
     std::optional<std::string> FetchBlock(NodeId peer_id, const CBlockIndex& block_index) override
         EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
     bool GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) const override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
-    bool IgnoresIncomingTxs() override { return m_ignore_incoming_txs; }
+    bool IgnoresIncomingTxs() override { return m_opts.ignore_incoming_txs; }
     void SendPings() override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
     void RelayTransaction(const uint256& txid, const uint256& wtxid) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
     void SetBestHeight(int height) override { m_best_height = height; };
@@ -718,8 +717,7 @@ private:
     /** Next time to check for stale tip */
     std::chrono::seconds m_stale_tip_check_time GUARDED_BY(cs_main){0s};
 
-    /** Whether this node is running in -blocksonly mode */
-    const bool m_ignore_incoming_txs;
+    const Options m_opts;
 
     bool RejectIncomingTxs(const CNode& peer) const;
 
@@ -1212,7 +1210,7 @@ void PeerManagerImpl::MaybeSetPeerAsAnnouncingHeaderAndIDs(NodeId nodeid)
     // When in -blocksonly mode, never request high-bandwidth mode from peers. Our
     // mempool will not contain the transactions necessary to reconstruct the
     // compact block.
-    if (m_ignore_incoming_txs) return;
+    if (m_opts.ignore_incoming_txs) return;
 
     CNodeState* nodestate = State(nodeid);
     if (!nodestate || !nodestate->m_provides_cmpctblocks) {
@@ -1650,13 +1648,12 @@ bool PeerManagerImpl::GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) c
 
 void PeerManagerImpl::AddToCompactExtraTransactions(const CTransactionRef& tx)
 {
-    size_t max_extra_txn = gArgs.GetIntArg("-blockreconstructionextratxn", DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN);
-    if (max_extra_txn <= 0)
+    if (m_opts.max_extra_txs <= 0)
         return;
     if (!vExtraTxnForCompact.size())
-        vExtraTxnForCompact.resize(max_extra_txn);
+        vExtraTxnForCompact.resize(m_opts.max_extra_txs);
     vExtraTxnForCompact[vExtraTxnForCompactIt] = std::make_pair(tx->GetWitnessHash(), tx);
-    vExtraTxnForCompactIt = (vExtraTxnForCompactIt + 1) % max_extra_txn;
+    vExtraTxnForCompactIt = (vExtraTxnForCompactIt + 1) % m_opts.max_extra_txs;
 }
 
 void PeerManagerImpl::Misbehaving(Peer& peer, int howmuch, const std::string& message)
@@ -1809,25 +1806,25 @@ std::optional<std::string> PeerManagerImpl::FetchBlock(NodeId peer_id, const CBl
 
 std::unique_ptr<PeerManager> PeerManager::make(CConnman& connman, AddrMan& addrman,
                                                BanMan* banman, ChainstateManager& chainman,
-                                               CTxMemPool& pool, bool ignore_incoming_txs)
+                                               CTxMemPool& pool, Options opts)
 {
-    return std::make_unique<PeerManagerImpl>(connman, addrman, banman, chainman, pool, ignore_incoming_txs);
+    return std::make_unique<PeerManagerImpl>(connman, addrman, banman, chainman, pool, opts);
 }
 
 PeerManagerImpl::PeerManagerImpl(CConnman& connman, AddrMan& addrman,
                                  BanMan* banman, ChainstateManager& chainman,
-                                 CTxMemPool& pool, bool ignore_incoming_txs)
+                                 CTxMemPool& pool, Options opts)
     : m_chainparams(chainman.GetParams()),
       m_connman(connman),
       m_addrman(addrman),
       m_banman(banman),
       m_chainman(chainman),
       m_mempool(pool),
-      m_ignore_incoming_txs(ignore_incoming_txs)
+      m_opts{opts}
 {
     // While Erlay support is incomplete, it must be enabled explicitly via -txreconciliation.
     // This argument can go away after Erlay support is complete.
-    if (gArgs.GetBoolArg("-txreconciliation", DEFAULT_TXRECONCILIATION_ENABLE)) {
+    if (opts.reconcile_txs) {
         m_txreconciliation = std::make_unique<TxReconciliationTracker>(TXRECONCILIATION_VERSION);
     }
 }
@@ -2729,7 +2726,7 @@ void PeerManagerImpl::HeadersDirectFetchBlocks(CNode& pfrom, const Peer& peer, c
                          last_header.nHeight);
             }
             if (vGetData.size() > 0) {
-                if (!m_ignore_incoming_txs &&
+                if (!m_opts.ignore_incoming_txs &&
                         nodestate->m_provides_cmpctblocks &&
                         vGetData.size() == 1 &&
                         mapBlocksInFlight.size() == 1 &&
@@ -3434,7 +3431,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
             // - we are not in -blocksonly mode.
             const auto* tx_relay = peer->GetTxRelay();
             if (tx_relay && WITH_LOCK(tx_relay->m_bloom_filter_mutex, return tx_relay->m_relay_txs) &&
-                !pfrom.IsAddrFetchConn() && !m_ignore_incoming_txs) {
+                !pfrom.IsAddrFetchConn() && !m_opts.ignore_incoming_txs) {
                 const uint64_t recon_salt = m_txreconciliation->PreRegisterPeer(pfrom.GetId());
                 m_connman.PushMessage(&pfrom, msg_maker.Make(NetMsgType::SENDTXRCNCL,
                                                              TXRECONCILIATION_VERSION, recon_salt));
@@ -4239,8 +4236,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
                 m_txrequest.ForgetTxHash(tx.GetWitnessHash());
 
                 // DoS prevention: do not allow m_orphanage to grow unbounded (see CVE-2012-3789)
-                unsigned int nMaxOrphanTx = (unsigned int)std::max((int64_t)0, gArgs.GetIntArg("-maxorphantx", DEFAULT_MAX_ORPHAN_TRANSACTIONS));
-                m_orphanage.LimitOrphans(nMaxOrphanTx);
+                m_orphanage.LimitOrphans(m_opts.max_orphan_txs);
             } else {
                 LogPrint(BCLog::MEMPOOL, "not keeping orphan with rejected parents %s\n",tx.GetHash().ToString());
                 // We will continue to reject this tx since it has rejected
@@ -5008,7 +5004,7 @@ bool PeerManagerImpl::ProcessMessages(CNode* pfrom, std::atomic<bool>& interrupt
         msg.m_recv.data()
     );
 
-    if (gArgs.GetBoolArg("-capturemessages", false)) {
+    if (m_opts.capture_messages) {
         CaptureMessage(pfrom->addr, msg.m_type, MakeUCharSpan(msg.m_recv), /*is_incoming=*/true);
     }
 
@@ -5358,7 +5354,7 @@ void PeerManagerImpl::MaybeSendSendHeaders(CNode& node, Peer& peer)
 
 void PeerManagerImpl::MaybeSendFeefilter(CNode& pto, Peer& peer, std::chrono::microseconds current_time)
 {
-    if (m_ignore_incoming_txs) return;
+    if (m_opts.ignore_incoming_txs) return;
     if (pto.GetCommonVersion() < FEEFILTER_VERSION) return;
     // peers with the forcerelay permission should not filter txs to us
     if (pto.HasPermission(NetPermissionFlags::ForceRelay)) return;
@@ -5426,7 +5422,7 @@ bool PeerManagerImpl::RejectIncomingTxs(const CNode& peer) const
     if (peer.IsBlockOnlyConn()) return true;
     if (peer.IsFeelerConn()) return true;
     // In -blocksonly mode, peers need the 'relay' permission to send txs to us
-    if (m_ignore_incoming_txs && !peer.HasPermission(NetPermissionFlags::Relay)) return true;
+    if (m_opts.ignore_incoming_txs && !peer.HasPermission(NetPermissionFlags::Relay)) return true;
     return false;
 }
 
diff --git a/src/net_processing.h b/src/net_processing.h
index deebb24c94..a0cbe92289 100644
--- a/src/net_processing.h
+++ b/src/net_processing.h
@@ -14,6 +14,8 @@ class CChainParams;
 class CTxMemPool;
 class ChainstateManager;
 
+/** Whether transaction reconciliation protocol should be enabled by default. */
+static constexpr bool DEFAULT_TXRECONCILIATION_ENABLE{false};
 /** Default for -maxorphantx, maximum number of orphan transactions kept in memory */
 static const unsigned int DEFAULT_MAX_ORPHAN_TRANSACTIONS = 100;
 /** Default number of orphan+recently-replaced txn to keep around for block reconstruction */
@@ -43,9 +45,18 @@ struct CNodeStateStats {
 class PeerManager : public CValidationInterface, public NetEventsInterface
 {
 public:
+    struct Options {
+        /** Whether this node is running in -blocksonly mode */
+        bool ignore_incoming_txs{DEFAULT_BLOCKSONLY};
+        bool reconcile_txs{DEFAULT_TXRECONCILIATION_ENABLE};
+        uint32_t max_orphan_txs{DEFAULT_MAX_ORPHAN_TRANSACTIONS};
+        size_t max_extra_txs{DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN};
+        bool capture_messages{false};
+    };
+
     static std::unique_ptr<PeerManager> make(CConnman& connman, AddrMan& addrman,
                                              BanMan* banman, ChainstateManager& chainman,
-                                             CTxMemPool& pool, bool ignore_incoming_txs);
+                                             CTxMemPool& pool, Options opts);
     virtual ~PeerManager() { }
 
     /**
diff --git a/src/node/peerman_args.cpp b/src/node/peerman_args.cpp
new file mode 100644
index 0000000000..e5868ead12
--- /dev/null
+++ b/src/node/peerman_args.cpp
@@ -0,0 +1,24 @@
+#include <node/peerman_args.h>
+
+#include <common/args.h>
+#include <net_processing.h>
+
+namespace node {
+
+void ApplyArgsManOptions(const ArgsManager& argsman, PeerManager::Options& options)
+{
+    if (auto value{argsman.GetBoolArg("-txreconciliation")}) options.reconcile_txs = *value;
+
+    if (auto value{argsman.GetIntArg("-maxorphantx")}) {
+        options.max_orphan_txs = uint32_t(std::max(int64_t{0}, *value));
+    }
+
+    if (auto value{argsman.GetIntArg("-blockreconstructionextratxn")}) {
+        options.max_extra_txs = size_t(std::max(int64_t{0}, *value));
+    }
+
+    if (auto value{argsman.GetBoolArg("-capturemessages")}) options.capture_messages = *value;
+}
+
+} // namespace node
+
diff --git a/src/node/peerman_args.h b/src/node/peerman_args.h
new file mode 100644
index 0000000000..73dbdb446c
--- /dev/null
+++ b/src/node/peerman_args.h
@@ -0,0 +1,12 @@
+#ifndef BITCOIN_NODE_PEERMAN_ARGS_H
+#define BITCOIN_NODE_PEERMAN_ARGS_H
+
+#include <net_processing.h>
+
+class ArgsManager;
+
+namespace node {
+void ApplyArgsManOptions(const ArgsManager& argsman, PeerManager::Options& options);
+} // namespace node
+
+#endif // BITCOIN_NODE_PEERMAN_ARGS_H
diff --git a/src/node/txreconciliation.h b/src/node/txreconciliation.h
index 4591dd5df7..3bbb077366 100644
--- a/src/node/txreconciliation.h
+++ b/src/node/txreconciliation.h
@@ -11,8 +11,6 @@
 #include <memory>
 #include <tuple>
 
-/** Whether transaction reconciliation protocol should be enabled by default. */
-static constexpr bool DEFAULT_TXRECONCILIATION_ENABLE{false};
 /** Supported transaction reconciliation protocol version */
 static constexpr uint32_t TXRECONCILIATION_VERSION{1};
 
diff --git a/src/test/denialofservice_tests.cpp b/src/test/denialofservice_tests.cpp
index 13349329ff..9193d9a8b3 100644
--- a/src/test/denialofservice_tests.cpp
+++ b/src/test/denialofservice_tests.cpp
@@ -132,8 +132,7 @@ BOOST_AUTO_TEST_CASE(stale_tip_peer_management)
 {
     NodeId id{0};
     auto connman = std::make_unique<ConnmanTestMsg>(0x1337, 0x1337, *m_node.addrman, *m_node.netgroupman);
-    auto peerLogic = PeerManager::make(*connman, *m_node.addrman, nullptr,
-                                       *m_node.chainman, *m_node.mempool, false);
+    auto peerLogic = PeerManager::make(*connman, *m_node.addrman, nullptr, *m_node.chainman, *m_node.mempool, {});
 
     constexpr int max_outbound_full_relay = MAX_OUTBOUND_FULL_RELAY_CONNECTIONS;
     CConnman::Options options;
@@ -209,8 +208,7 @@ BOOST_AUTO_TEST_CASE(block_relay_only_eviction)
 {
     NodeId id{0};
     auto connman = std::make_unique<ConnmanTestMsg>(0x1337, 0x1337, *m_node.addrman, *m_node.netgroupman);
-    auto peerLogic = PeerManager::make(*connman, *m_node.addrman, nullptr,
-                                       *m_node.chainman, *m_node.mempool, false);
+    auto peerLogic = PeerManager::make(*connman, *m_node.addrman, nullptr, *m_node.chainman, *m_node.mempool, {});
 
     constexpr int max_outbound_block_relay{MAX_BLOCK_RELAY_ONLY_CONNECTIONS};
     constexpr int64_t MINIMUM_CONNECT_TIME{30};
@@ -273,8 +271,7 @@ BOOST_AUTO_TEST_CASE(peer_discouragement)
 
     auto banman = std::make_unique<BanMan>(m_args.GetDataDirBase() / "banlist", nullptr, DEFAULT_MISBEHAVING_BANTIME);
     auto connman = std::make_unique<ConnmanTestMsg>(0x1337, 0x1337, *m_node.addrman, *m_node.netgroupman);
-    auto peerLogic = PeerManager::make(*connman, *m_node.addrman, banman.get(),
-                                       *m_node.chainman, *m_node.mempool, false);
+    auto peerLogic = PeerManager::make(*connman, *m_node.addrman, banman.get(), *m_node.chainman, *m_node.mempool, {});
 
     CNetAddr tor_netaddr;
     BOOST_REQUIRE(
@@ -376,8 +373,7 @@ BOOST_AUTO_TEST_CASE(DoS_bantime)
 
     auto banman = std::make_unique<BanMan>(m_args.GetDataDirBase() / "banlist", nullptr, DEFAULT_MISBEHAVING_BANTIME);
     auto connman = std::make_unique<CConnman>(0x1337, 0x1337, *m_node.addrman, *m_node.netgroupman);
-    auto peerLogic = PeerManager::make(*connman, *m_node.addrman, banman.get(),
-                                       *m_node.chainman, *m_node.mempool, false);
+    auto peerLogic = PeerManager::make(*connman, *m_node.addrman, banman.get(), *m_node.chainman, *m_node.mempool, {});
 
     banman->ClearBanned();
     int64_t nStartTime = GetTime();
diff --git a/src/test/util/setup_common.cpp b/src/test/util/setup_common.cpp
index 6ae2187974..65c657da96 100644
--- a/src/test/util/setup_common.cpp
+++ b/src/test/util/setup_common.cpp
@@ -27,6 +27,7 @@
 #include <node/kernel_notifications.h>
 #include <node/mempool_args.h>
 #include <node/miner.h>
+#include <node/peerman_args.h>
 #include <node/validation_cache_args.h>
 #include <noui.h>
 #include <policy/fees.h>
@@ -251,9 +252,12 @@ TestingSetup::TestingSetup(
                                                m_node.args->GetIntArg("-checkaddrman", 0));
     m_node.banman = std::make_unique<BanMan>(m_args.GetDataDirBase() / "banlist", nullptr, DEFAULT_MISBEHAVING_BANTIME);
     m_node.connman = std::make_unique<ConnmanTestMsg>(0x1337, 0x1337, *m_node.addrman, *m_node.netgroupman); // Deterministic randomness for tests.
+    PeerManager::Options peerman_opts;
+    ApplyArgsManOptions(*m_node.args, peerman_opts);
     m_node.peerman = PeerManager::make(*m_node.connman, *m_node.addrman,
                                        m_node.banman.get(), *m_node.chainman,
-                                       *m_node.mempool, false);
+                                       *m_node.mempool, peerman_opts);
+
     {
         CConnman::Options options;
         options.m_msgproc = m_node.peerman.get();