kernel: Pass interrupt reference to chainman

This and the following commit seek to decouple the libbitcoinkernel
library from the shutdown code. As a library, it should it should have
its own flexible interrupt infrastructure without relying on node-wide
globals.

The commit takes the first step towards this goal by de-globalising
`ShutdownRequested` calls in kernel code.

Co-authored-by: Russell Yanofsky <russ@yanofsky.org>
Co-authored-by: TheCharlatan <seb.kung@gmail.com>

src/bitcoin-chainstate.cpp

@@ -113,7 +113,7 @@ int main(int argc, char* argv[])
         .chainparams = chainman_opts.chainparams,
         .blocks_dir = abs_datadir / "blocks",
     };
-    ChainstateManager chainman{chainman_opts, blockman_opts};
+    ChainstateManager chainman{kernel_context.interrupt, chainman_opts, blockman_opts};
 
     node::CacheSizes cache_sizes;
     cache_sizes.block_tree_db = 2 << 20;

src/init.cpp

@@ -1462,7 +1462,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
     for (bool fLoaded = false; !fLoaded && !ShutdownRequested();) {
         node.mempool = std::make_unique<CTxMemPool>(mempool_opts);
 
-        node.chainman = std::make_unique<ChainstateManager>(chainman_opts, blockman_opts);
+        node.chainman = std::make_unique<ChainstateManager>(node.kernel->interrupt, chainman_opts, blockman_opts);
         ChainstateManager& chainman = *node.chainman;
 
         node::ChainstateLoadOptions options;

src/kernel/mempool_persist.cpp

@@ -9,13 +9,13 @@
 #include <logging.h>
 #include <primitives/transaction.h>
 #include <serialize.h>
-#include <shutdown.h>
 #include <streams.h>
 #include <sync.h>
 #include <txmempool.h>
 #include <uint256.h>
 #include <util/fs.h>
 #include <util/fs_helpers.h>
+#include <util/signalinterrupt.h>
 #include <util/time.h>
 #include <validation.h>
 
@@ -95,7 +95,7 @@ bool LoadMempool(CTxMemPool& pool, const fs::path& load_path, Chainstate& active
             } else {
                 ++expired;
             }
-            if (ShutdownRequested())
+            if (active_chainstate.m_chainman.m_interrupt)
                 return false;
         }
         std::map<uint256, CAmount> mapDeltas;

src/node/blockstorage.cpp

@@ -13,12 +13,12 @@
 #include <logging.h>
 #include <pow.h>
 #include <reverse_iterator.h>
-#include <shutdown.h>
 #include <signet.h>
 #include <streams.h>
 #include <undo.h>
 #include <util/batchpriority.h>
 #include <util/fs.h>
+#include <util/signalinterrupt.h>
 #include <validation.h>
 
 #include <map>
@@ -250,7 +250,8 @@ CBlockIndex* BlockManager::InsertBlockIndex(const uint256& hash)
 
 bool BlockManager::LoadBlockIndex()
 {
-    if (!m_block_tree_db->LoadBlockIndexGuts(GetConsensus(), [this](const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { return this->InsertBlockIndex(hash); })) {
+    if (!m_block_tree_db->LoadBlockIndexGuts(
+            GetConsensus(), [this](const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { return this->InsertBlockIndex(hash); }, m_interrupt)) {
         return false;
     }
 
@@ -260,7 +261,7 @@ bool BlockManager::LoadBlockIndex()
               CBlockIndexHeightOnlyComparator());
 
     for (CBlockIndex* pindex : vSortedByHeight) {
-        if (ShutdownRequested()) return false;
+        if (m_interrupt) return false;
         pindex->nChainWork = (pindex->pprev ? pindex->pprev->nChainWork : 0) + GetBlockProof(*pindex);
         pindex->nTimeMax = (pindex->pprev ? std::max(pindex->pprev->nTimeMax, pindex->nTime) : pindex->nTime);
 
@@ -890,8 +891,8 @@ void ThreadImport(ChainstateManager& chainman, std::vector<fs::path> vImportFile
                 }
                 LogPrintf("Reindexing block file blk%05u.dat...\n", (unsigned int)nFile);
                 chainman.ActiveChainstate().LoadExternalBlockFile(file, &pos, &blocks_with_unknown_parent);
-                if (ShutdownRequested()) {
-                    LogPrintf("Shutdown requested. Exit %s\n", __func__);
+                if (chainman.m_interrupt) {
+                    LogPrintf("Interrupt requested. Exit %s\n", __func__);
                     return;
                 }
                 nFile++;
@@ -909,8 +910,8 @@ void ThreadImport(ChainstateManager& chainman, std::vector<fs::path> vImportFile
             if (file) {
                 LogPrintf("Importing blocks file %s...\n", fs::PathToString(path));
                 chainman.ActiveChainstate().LoadExternalBlockFile(file);
-                if (ShutdownRequested()) {
-                    LogPrintf("Shutdown requested. Exit %s\n", __func__);
+                if (chainman.m_interrupt) {
+                    LogPrintf("Interrupt requested. Exit %s\n", __func__);
                     return;
                 }
             } else {

src/node/blockstorage.h

@@ -33,6 +33,9 @@ struct FlatFilePos;
 namespace Consensus {
 struct Params;
 }
+namespace util {
+class SignalInterrupt;
+} // namespace util
 
 namespace node {
 
@@ -153,10 +156,12 @@ private:
 public:
     using Options = kernel::BlockManagerOpts;
 
-    explicit BlockManager(Options opts)
+    explicit BlockManager(const util::SignalInterrupt& interrupt, Options opts)
         : m_prune_mode{opts.prune_target > 0},
-          m_opts{std::move(opts)} {};
+          m_opts{std::move(opts)},
+          m_interrupt{interrupt} {};
 
+    const util::SignalInterrupt& m_interrupt;
     std::atomic<bool> m_importing{false};
 
     BlockMap m_block_index GUARDED_BY(cs_main);

src/test/blockmanager_tests.cpp

@@ -25,7 +25,7 @@ BOOST_AUTO_TEST_CASE(blockmanager_find_block_pos)
         .chainparams = *params,
         .blocks_dir = m_args.GetBlocksDirPath(),
     };
-    BlockManager blockman{blockman_opts};
+    BlockManager blockman{m_node.kernel->interrupt, blockman_opts};
     CChain chain {};
     // simulate adding a genesis block normally
     BOOST_CHECK_EQUAL(blockman.SaveBlockToDisk(params->GenesisBlock(), 0, chain, nullptr).nPos, BLOCK_SERIALIZATION_HEADER_SIZE);

src/test/util/setup_common.cpp

@@ -197,7 +197,7 @@ ChainTestingSetup::ChainTestingSetup(const ChainType chainType, const std::vecto
         .chainparams = chainman_opts.chainparams,
         .blocks_dir = m_args.GetBlocksDirPath(),
     };
-    m_node.chainman = std::make_unique<ChainstateManager>(chainman_opts, blockman_opts);
+    m_node.chainman = std::make_unique<ChainstateManager>(m_node.kernel->interrupt, chainman_opts, blockman_opts);
     m_node.chainman->m_blockman.m_block_tree_db = std::make_unique<CBlockTreeDB>(DBParams{
         .path = m_args.GetDataDirNet() / "blocks" / "index",
         .cache_bytes = static_cast<size_t>(m_cache_sizes.block_tree_db),

src/test/validation_chainstatemanager_tests.cpp

@@ -393,7 +393,7 @@ struct SnapshotTestSetup : TestChain100Setup {
             // For robustness, ensure the old manager is destroyed before creating a
             // new one.
             m_node.chainman.reset();
-            m_node.chainman = std::make_unique<ChainstateManager>(chainman_opts, blockman_opts);
+            m_node.chainman = std::make_unique<ChainstateManager>(m_node.kernel->interrupt, chainman_opts, blockman_opts);
         }
         return *Assert(m_node.chainman);
     }

src/txdb.cpp

@@ -9,8 +9,8 @@
 #include <logging.h>
 #include <pow.h>
 #include <random.h>
-#include <shutdown.h>
 #include <uint256.h>
+#include <util/signalinterrupt.h>
 #include <util/translation.h>
 #include <util/vector.h>
 
@@ -291,7 +291,7 @@ bool CBlockTreeDB::ReadFlag(const std::string &name, bool &fValue) {
     return true;
 }
 
-bool CBlockTreeDB::LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex)
+bool CBlockTreeDB::LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex, const util::SignalInterrupt& interrupt)
 {
     AssertLockHeld(::cs_main);
     std::unique_ptr<CDBIterator> pcursor(NewIterator());
@@ -299,7 +299,7 @@ bool CBlockTreeDB::LoadBlockIndexGuts(const Consensus::Params& consensusParams,
 
     // Load m_block_index
     while (pcursor->Valid()) {
-        if (ShutdownRequested()) return false;
+        if (interrupt) return false;
         std::pair<uint8_t, uint256> key;
         if (pcursor->GetKey(key) && key.first == DB_BLOCK_INDEX) {
             CDiskBlockIndex diskindex;

src/txdb.h

@@ -29,6 +29,9 @@ class uint256;
 namespace Consensus {
 struct Params;
 };
+namespace util {
+class SignalInterrupt;
+} // namespace util
 
 //! -dbcache default (MiB)
 static const int64_t nDefaultDbCache = 450;
@@ -98,7 +101,7 @@ public:
     void ReadReindexing(bool &fReindexing);
     bool WriteFlag(const std::string &name, bool fValue);
     bool ReadFlag(const std::string &name, bool &fValue);
-    bool LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex)
+    bool LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex, const util::SignalInterrupt& interrupt)
         EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
 };
 

src/validation.cpp

@@ -50,6 +50,7 @@
 #include <util/hasher.h>
 #include <util/moneystr.h>
 #include <util/rbf.h>
+#include <util/signalinterrupt.h>
 #include <util/strencodings.h>
 #include <util/time.h>
 #include <util/trace.h>
@@ -3183,11 +3184,11 @@ bool Chainstate::ActivateBestChain(BlockValidationState& state, std::shared_ptr<
             break;
         }
 
-        // We check shutdown only after giving ActivateBestChainStep a chance to run once so that we
-        // never shutdown before connecting the genesis block during LoadChainTip(). Previously this
-        // caused an assert() failure during shutdown in such cases as the UTXO DB flushing checks
+        // We check interrupt only after giving ActivateBestChainStep a chance to run once so that we
+        // never interrupt before connecting the genesis block during LoadChainTip(). Previously this
+        // caused an assert() failure during interrupt in such cases as the UTXO DB flushing checks
         // that the best block hash is non-null.
-        if (ShutdownRequested()) break;
+        if (m_chainman.m_interrupt) break;
     } while (pindexNewTip != pindexMostWork);
     CheckBlockIndex();
 
@@ -3277,7 +3278,7 @@ bool Chainstate::InvalidateBlock(BlockValidationState& state, CBlockIndex* pinde
 
     // Disconnect (descendants of) pindex, and mark them invalid.
     while (true) {
-        if (ShutdownRequested()) break;
+        if (m_chainman.m_interrupt) break;
 
         // Make sure the queue of validation callbacks doesn't grow unboundedly.
         LimitValidationInterfaceQueue();
@@ -4079,7 +4080,7 @@ void Chainstate::LoadMempool(const fs::path& load_path, FopenFn mockable_fopen_f
 {
     if (!m_mempool) return;
     ::LoadMempool(*m_mempool, load_path, *this, mockable_fopen_function);
-    m_mempool->SetLoadTried(!ShutdownRequested());
+    m_mempool->SetLoadTried(!m_chainman.m_interrupt);
 }
 
 bool Chainstate::LoadChainTip()
@@ -4212,7 +4213,7 @@ VerifyDBResult CVerifyDB::VerifyDB(
                 skipped_l3_checks = true;
             }
         }
-        if (ShutdownRequested()) return VerifyDBResult::INTERRUPTED;
+        if (chainstate.m_chainman.m_interrupt) return VerifyDBResult::INTERRUPTED;
     }
     if (pindexFailure) {
         LogPrintf("Verification error: coin database inconsistencies found (last %i blocks, %i good transactions before that)\n", chainstate.m_chain.Height() - pindexFailure->nHeight + 1, nGoodTransactions);
@@ -4245,7 +4246,7 @@ VerifyDBResult CVerifyDB::VerifyDB(
                 LogPrintf("Verification error: found unconnectable block at %d, hash=%s (%s)\n", pindex->nHeight, pindex->GetBlockHash().ToString(), state.ToString());
                 return VerifyDBResult::CORRUPTED_BLOCK_DB;
             }
-            if (ShutdownRequested()) return VerifyDBResult::INTERRUPTED;
+            if (chainstate.m_chainman.m_interrupt) return VerifyDBResult::INTERRUPTED;
         }
     }
 
@@ -4413,7 +4414,7 @@ bool ChainstateManager::LoadBlockIndex()
         }
 
         for (CBlockIndex* pindex : vSortedByHeight) {
-            if (ShutdownRequested()) return false;
+            if (m_interrupt) return false;
             if (pindex->IsAssumedValid() ||
                     (pindex->IsValid(BLOCK_VALID_TRANSACTIONS) &&
                      (pindex->HaveTxsDownloaded() || pindex->pprev == nullptr))) {
@@ -4519,7 +4520,7 @@ void Chainstate::LoadExternalBlockFile(
         // such as a block fails to deserialize.
         uint64_t nRewind = blkdat.GetPos();
         while (!blkdat.eof()) {
-            if (ShutdownRequested()) return;
+            if (m_chainman.m_interrupt) return;
 
             blkdat.SetPos(nRewind);
             nRewind++; // start one byte further next time, in case of failure
@@ -5152,13 +5153,13 @@ struct StopHashingException : public std::exception
 {
     const char* what() const throw() override
     {
-        return "ComputeUTXOStats interrupted by shutdown.";
+        return "ComputeUTXOStats interrupted.";
     }
 };
 
-static void SnapshotUTXOHashBreakpoint()
+static void SnapshotUTXOHashBreakpoint(const util::SignalInterrupt& interrupt)
 {
-    if (ShutdownRequested()) throw StopHashingException();
+    if (interrupt) throw StopHashingException();
 }
 
 bool ChainstateManager::PopulateAndValidateSnapshot(
@@ -5235,7 +5236,7 @@ bool ChainstateManager::PopulateAndValidateSnapshot(
         // If our average Coin size is roughly 41 bytes, checking every 120,000 coins
         // means <5MB of memory imprecision.
         if (coins_processed % 120000 == 0) {
-            if (ShutdownRequested()) {
+            if (m_interrupt) {
                 return false;
             }
 
@@ -5292,7 +5293,7 @@ bool ChainstateManager::PopulateAndValidateSnapshot(
 
     try {
         maybe_stats = ComputeUTXOStats(
-            CoinStatsHashType::HASH_SERIALIZED, snapshot_coinsdb, m_blockman, SnapshotUTXOHashBreakpoint);
+            CoinStatsHashType::HASH_SERIALIZED, snapshot_coinsdb, m_blockman, [&interrupt = m_interrupt] { SnapshotUTXOHashBreakpoint(interrupt); });
     } catch (StopHashingException const&) {
         return false;
     }
@@ -5470,7 +5471,7 @@ SnapshotCompletionResult ChainstateManager::MaybeCompleteSnapshotValidation(
             CoinStatsHashType::HASH_SERIALIZED,
             &ibd_coins_db,
             m_blockman,
-            SnapshotUTXOHashBreakpoint);
+            [&interrupt = m_interrupt] { SnapshotUTXOHashBreakpoint(interrupt); });
     } catch (StopHashingException const&) {
         return SnapshotCompletionResult::STATS_FAILED;
     }
@@ -5579,9 +5580,10 @@ static ChainstateManager::Options&& Flatten(ChainstateManager::Options&& opts)
     return std::move(opts);
 }
 
-ChainstateManager::ChainstateManager(Options options, node::BlockManager::Options blockman_options)
-    : m_options{Flatten(std::move(options))},
-      m_blockman{std::move(blockman_options)} {}
+ChainstateManager::ChainstateManager(const util::SignalInterrupt& interrupt, Options options, node::BlockManager::Options blockman_options)
+    : m_interrupt{interrupt},
+      m_options{Flatten(std::move(options))},
+      m_blockman{interrupt, std::move(blockman_options)} {}
 
 ChainstateManager::~ChainstateManager()
 {

src/validation.h

@@ -62,6 +62,9 @@ class SnapshotMetadata;
 namespace Consensus {
 struct Params;
 } // namespace Consensus
+namespace util {
+class SignalInterrupt;
+} // namespace util
 
 /** Maximum number of dedicated script-checking threads allowed */
 static const int MAX_SCRIPTCHECK_THREADS = 15;
@@ -959,7 +962,7 @@ private:
 public:
     using Options = kernel::ChainstateManagerOpts;
 
-    explicit ChainstateManager(Options options, node::BlockManager::Options blockman_options);
+    explicit ChainstateManager(const util::SignalInterrupt& interrupt, Options options, node::BlockManager::Options blockman_options);
 
     const CChainParams& GetParams() const { return m_options.chainparams; }
     const Consensus::Params& GetConsensus() const { return m_options.chainparams.GetConsensus(); }
@@ -982,6 +985,7 @@ public:
      */
     RecursiveMutex& GetMutex() const LOCK_RETURNED(::cs_main) { return ::cs_main; }
 
+    const util::SignalInterrupt& m_interrupt;
     const Options m_options;
     std::thread m_load_block;
     //! A single BlockManager instance is shared across each constructed