node/chainstate: Decouple from ShutdownRequested

...instead allow optionally passing in a std::function<bool()>

src/init.cpp

@@ -1430,6 +1430,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
                                 nBlockTreeDBCache,
                                 nCoinDBCache,
                                 nCoinCacheUsage,
+                                ShutdownRequested,
                                 []() {
                                     uiInterface.ThreadSafeMessageBox(
                                                                      _("Error reading from database, shutting down."),

src/node/chainstate.cpp

@@ -6,7 +6,6 @@
 
 #include <chainparams.h> // for CChainParams
 #include <node/blockstorage.h> // for CleanupBlockRevFiles, fHavePruned, fReindex
-#include <shutdown.h> // for ShutdownRequested
 #include <validation.h> // for a lot of things
 
 std::optional<ChainstateLoadingError> LoadChainstate(bool fReset,
@@ -18,6 +17,7 @@ std::optional<ChainstateLoadingError> LoadChainstate(bool fReset,
                                                      int64_t nBlockTreeDBCache,
                                                      int64_t nCoinDBCache,
                                                      int64_t nCoinCacheUsage,
+                                                     std::function<bool()> shutdown_requested,
                                                      std::function<void()> coins_error_cb)
 {
     auto is_coinsview_empty = [&](CChainState* chainstate) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
@@ -45,14 +45,14 @@ std::optional<ChainstateLoadingError> LoadChainstate(bool fReset,
                 CleanupBlockRevFiles();
         }
 
-        if (ShutdownRequested()) return ChainstateLoadingError::SHUTDOWN_PROBED;
+        if (shutdown_requested && shutdown_requested()) return ChainstateLoadingError::SHUTDOWN_PROBED;
 
         // LoadBlockIndex will load fHavePruned if we've ever removed a
         // block file from disk.
         // Note that it also sets fReindex based on the disk flag!
         // From here on out fReindex and fReset mean something different!
         if (!chainman.LoadBlockIndex()) {
-            if (ShutdownRequested()) return ChainstateLoadingError::SHUTDOWN_PROBED;
+            if (shutdown_requested && shutdown_requested()) return ChainstateLoadingError::SHUTDOWN_PROBED;
             return ChainstateLoadingError::ERROR_LOADING_BLOCK_DB;
         }
 

src/node/chainstate.h

@@ -45,10 +45,10 @@ enum class ChainstateLoadingError {
  *        differentiable by the specific enumerator.
  *
  *        Note that a return value of SHUTDOWN_PROBED means ONLY that "during
- *        this sequence, when we explicitly checked ShutdownRequested() at
+ *        this sequence, when we explicitly checked shutdown_requested() at
  *        arbitrary points, one of those calls returned true". Therefore, a
  *        return value other than SHUTDOWN_PROBED does not guarantee that
- *        ShutdownRequested() hasn't been called indirectly.
+ *        shutdown_requested() hasn't been called indirectly.
  *  - else
  *      - Success!
  */
@@ -61,6 +61,7 @@ std::optional<ChainstateLoadingError> LoadChainstate(bool fReset,
                                                      int64_t nBlockTreeDBCache,
                                                      int64_t nCoinDBCache,
                                                      int64_t nCoinCacheUsage,
+                                                     std::function<bool()> shutdown_requested = nullptr,
                                                      std::function<void()> coins_error_cb = nullptr);
 
 enum class ChainstateLoadVerifyError {