refactor: Add stop_at_height option in ChainstateManager

Remove access to the global gArgs for the stopatheight argument and
replace it by adding a field to the existing ChainstateManager Options
struct.

This should eventually allow users of the ChainstateManager to not rely
on the global gArgs and instead pass in their own options.

Author: TheCharlatan

src/kernel/chainstatemanager_opts.h

@@ -21,6 +21,7 @@ class CChainParams;
 
 static constexpr bool DEFAULT_CHECKPOINTS_ENABLED{true};
 static constexpr auto DEFAULT_MAX_TIP_AGE{24h};
+static constexpr int DEFAULT_STOPATHEIGHT{0};
 
 namespace kernel {
 
@@ -45,6 +46,7 @@ struct ChainstateManagerOpts {
     DBOptions coins_db{};
     CoinsViewOptions coins_view{};
     Notifications& notifications;
+    int stop_at_height{DEFAULT_STOPATHEIGHT};
 };
 
 } // namespace kernel

src/node/chainstatemanager_args.cpp

@@ -37,6 +37,8 @@ util::Result<void> ApplyArgsManOptions(const ArgsManager& args, ChainstateManage
 
     if (auto value{args.GetIntArg("-maxtipage")}) opts.max_tip_age = std::chrono::seconds{*value};
 
+    if (auto value{args.GetIntArg("-stopatheight")}) opts.stop_at_height = *value;
+
     ReadDatabaseArgs(args, opts.block_tree_db);
     ReadDatabaseArgs(args, opts.coins_db);
     ReadCoinsViewArgs(args, opts.coins_view);

src/validation.cpp

@@ -3104,7 +3104,6 @@ bool Chainstate::ActivateBestChain(BlockValidationState& state, std::shared_ptr<
 
     CBlockIndex *pindexMostWork = nullptr;
     CBlockIndex *pindexNewTip = nullptr;
-    int nStopAtHeight = gArgs.GetIntArg("-stopatheight", DEFAULT_STOPATHEIGHT);
     do {
         // Block until the validation queue drains. This should largely
         // never happen in normal operation, however may happen during
@@ -3179,7 +3178,7 @@ bool Chainstate::ActivateBestChain(BlockValidationState& state, std::shared_ptr<
         }
         // When we reach this point, we switched to a new tip (stored in pindexNewTip).
 
-        if (nStopAtHeight && pindexNewTip && pindexNewTip->nHeight >= nStopAtHeight) StartShutdown();
+        if (m_chainman.StopAtHeight() && pindexNewTip && pindexNewTip->nHeight >= m_chainman.StopAtHeight()) StartShutdown();
 
         if (WITH_LOCK(::cs_main, return m_disabled)) {
             // Background chainstate has reached the snapshot base block, so exit.

src/validation.h

@@ -65,8 +65,6 @@ struct Params;
 static const int MAX_SCRIPTCHECK_THREADS = 15;
 /** -par default (number of script-checking threads, 0 = auto) */
 static const int DEFAULT_SCRIPTCHECK_THREADS = 0;
-/** Default for -stopatheight */
-static const int DEFAULT_STOPATHEIGHT = 0;
 /** Block files containing a block-height within MIN_BLOCKS_TO_KEEP of ActiveChain().Tip() will not be pruned. */
 static const unsigned int MIN_BLOCKS_TO_KEEP = 288;
 static const signed int DEFAULT_CHECKBLOCKS = 6;
@@ -960,6 +958,7 @@ class ChainstateManager
     const arith_uint256& MinimumChainWork() const { return *Assert(m_options.minimum_chain_work); }
     const uint256& AssumedValidBlock() const { return *Assert(m_options.assumed_valid_block); }
     kernel::Notifications& GetNotifications() const { return m_options.notifications; };
+    int StopAtHeight() const { return m_options.stop_at_height; };
 
     /**
      * Alias for ::cs_main.