[net processing] PeerManager holds a FastRandomContext

Author: dergoegge

src/net_processing.cpp

@@ -695,6 +695,8 @@ class PeerManagerImpl final : public PeerManager
     /** Send `feefilter` message. */
     void MaybeSendFeefilter(CNode& node, Peer& peer, std::chrono::microseconds current_time) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
 
+    FastRandomContext m_rng GUARDED_BY(NetEventsInterface::g_msgproc_mutex);
+
     const CChainParams& m_chainparams;
     CConnman& m_connman;
     AddrMan& m_addrman;
@@ -1808,7 +1810,8 @@ std::unique_ptr<PeerManager> PeerManager::make(CConnman& connman, AddrMan& addrm
 PeerManagerImpl::PeerManagerImpl(CConnman& connman, AddrMan& addrman,
                                  BanMan* banman, ChainstateManager& chainman,
                                  CTxMemPool& pool, Options opts)
-    : m_chainparams(chainman.GetParams()),
+    : m_rng{opts.deterministic_rng},
+      m_chainparams(chainman.GetParams()),
       m_connman(connman),
       m_addrman(addrman),
       m_banman(banman),

src/net_processing.h

@@ -58,6 +58,9 @@ class PeerManager : public CValidationInterface, public NetEventsInterface
         uint32_t max_extra_txs{DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN};
         //! Whether all P2P messages are captured to disk
         bool capture_messages{false};
+        //! Whether or not the internal RNG behaves deterministically (this is
+        //! a test-only option).
+        bool deterministic_rng{false};
     };
 
     static std::unique_ptr<PeerManager> make(CConnman& connman, AddrMan& addrman,