LCOV - code coverage report
Current view: top level - src - validationinterface.cpp (source / functions) Hit Total Coverage
Test: coverage.lcov Lines: 149 149 100.0 %
Date: 2021-06-29 14:35:33 Functions: 54 54 100.0 %
Legend: Modified by patch:
Lines: hit not hit | Branches: + taken - not taken # not executed

Not modified by patch:
Lines: hit not hit | Branches: + taken - not taken # not executed
Branches: 63 86 73.3 %

           Branch data     Line data    Source code
#       1                 :            : // Copyright (c) 2009-2010 Satoshi Nakamoto
#       2                 :            : // Copyright (c) 2009-2020 The Bitcoin Core developers
#       3                 :            : // Distributed under the MIT software license, see the accompanying
#       4                 :            : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
#       5                 :            : 
#       6                 :            : #include <validationinterface.h>
#       7                 :            : 
#       8                 :            : #include <chain.h>
#       9                 :            : #include <consensus/validation.h>
#      10                 :            : #include <logging.h>
#      11                 :            : #include <primitives/block.h>
#      12                 :            : #include <primitives/transaction.h>
#      13                 :            : #include <scheduler.h>
#      14                 :            : 
#      15                 :            : #include <future>
#      16                 :            : #include <unordered_map>
#      17                 :            : #include <utility>
#      18                 :            : 
#      19                 :            : //! The MainSignalsInstance manages a list of shared_ptr<CValidationInterface>
#      20                 :            : //! callbacks.
#      21                 :            : //!
#      22                 :            : //! A std::unordered_map is used to track what callbacks are currently
#      23                 :            : //! registered, and a std::list is to used to store the callbacks that are
#      24                 :            : //! currently registered as well as any callbacks that are just unregistered
#      25                 :            : //! and about to be deleted when they are done executing.
#      26                 :            : struct MainSignalsInstance {
#      27                 :            : private:
#      28                 :            :     Mutex m_mutex;
#      29                 :            :     //! List entries consist of a callback pointer and reference count. The
#      30                 :            :     //! count is equal to the number of current executions of that entry, plus 1
#      31                 :            :     //! if it's registered. It cannot be 0 because that would imply it is
#      32                 :            :     //! unregistered and also not being executed (so shouldn't exist).
#      33                 :            :     struct ListEntry { std::shared_ptr<CValidationInterface> callbacks; int count = 1; };
#      34                 :            :     std::list<ListEntry> m_list GUARDED_BY(m_mutex);
#      35                 :            :     std::unordered_map<CValidationInterface*, std::list<ListEntry>::iterator> m_map GUARDED_BY(m_mutex);
#      36                 :            : 
#      37                 :            : public:
#      38                 :            :     // We are not allowed to assume the scheduler only runs in one thread,
#      39                 :            :     // but must ensure all callbacks happen in-order, so we end up creating
#      40                 :            :     // our own queue here :(
#      41                 :            :     SingleThreadedSchedulerClient m_schedulerClient;
#      42                 :            : 
#      43                 :        818 :     explicit MainSignalsInstance(CScheduler *pscheduler) : m_schedulerClient(pscheduler) {}
#      44                 :            : 
#      45                 :            :     void Register(std::shared_ptr<CValidationInterface> callbacks)
#      46                 :     255519 :     {
#      47                 :     255519 :         LOCK(m_mutex);
#      48                 :     255519 :         auto inserted = m_map.emplace(callbacks.get(), m_list.end());
#      49         [ +  - ]:     255519 :         if (inserted.second) inserted.first->second = m_list.emplace(m_list.end());
#      50                 :     255519 :         inserted.first->second->callbacks = std::move(callbacks);
#      51                 :     255519 :     }
#      52                 :            : 
#      53                 :            :     void Unregister(CValidationInterface* callbacks)
#      54                 :     255544 :     {
#      55                 :     255544 :         LOCK(m_mutex);
#      56                 :     255544 :         auto it = m_map.find(callbacks);
#      57         [ +  + ]:     255544 :         if (it != m_map.end()) {
#      58         [ +  + ]:     255518 :             if (!--it->second->count) m_list.erase(it->second);
#      59                 :     255518 :             m_map.erase(it);
#      60                 :     255518 :         }
#      61                 :     255544 :     }
#      62                 :            : 
#      63                 :            :     //! Clear unregisters every previously registered callback, erasing every
#      64                 :            :     //! map entry. After this call, the list may still contain callbacks that
#      65                 :            :     //! are currently executing, but it will be cleared when they are done
#      66                 :            :     //! executing.
#      67                 :            :     void Clear()
#      68                 :        663 :     {
#      69                 :        663 :         LOCK(m_mutex);
#      70         [ +  + ]:        663 :         for (const auto& entry : m_map) {
#      71         [ -  + ]:          1 :             if (!--entry.second->count) m_list.erase(entry.second);
#      72                 :          1 :         }
#      73                 :        663 :         m_map.clear();
#      74                 :        663 :     }
#      75                 :            : 
#      76                 :            :     template<typename F> void Iterate(F&& f)
#      77                 :     294483 :     {
#      78                 :     294483 :         WAIT_LOCK(m_mutex, lock);
#      79 [ +  + ][ +  + ]:     799067 :         for (auto it = m_list.begin(); it != m_list.end();) {
#         [ +  + ][ +  + ]
#         [ +  + ][ +  + ]
#         [ +  + ][ +  + ]
#      80                 :     504584 :             ++it->count;
#      81                 :     504584 :             {
#      82                 :     504584 :                 REVERSE_LOCK(lock);
#      83                 :     504584 :                 f(*it->callbacks);
#      84                 :     504584 :             }
#      85 [ +  - ][ +  + ]:     504584 :             it = --it->count ? std::next(it) : m_list.erase(it);
#         [ +  - ][ +  - ]
#         [ +  - ][ +  + ]
#         [ +  - ][ +  - ]
#      86                 :     504584 :         }
#      87                 :     294483 :     }
#      88                 :            : };
#      89                 :            : 
#      90                 :            : static CMainSignals g_signals;
#      91                 :            : 
#      92                 :            : void CMainSignals::RegisterBackgroundSignalScheduler(CScheduler& scheduler)
#      93                 :        818 : {
#      94                 :        818 :     assert(!m_internals);
#      95                 :        818 :     m_internals.reset(new MainSignalsInstance(&scheduler));
#      96                 :        818 : }
#      97                 :            : 
#      98                 :            : void CMainSignals::UnregisterBackgroundSignalScheduler()
#      99                 :        820 : {
#     100                 :        820 :     m_internals.reset(nullptr);
#     101                 :        820 : }
#     102                 :            : 
#     103                 :            : void CMainSignals::FlushBackgroundCallbacks()
#     104                 :        820 : {
#     105         [ +  + ]:        820 :     if (m_internals) {
#     106                 :        818 :         m_internals->m_schedulerClient.EmptyQueue();
#     107                 :        818 :     }
#     108                 :        820 : }
#     109                 :            : 
#     110                 :            : size_t CMainSignals::CallbacksPending()
#     111                 :      85370 : {
#     112         [ -  + ]:      85370 :     if (!m_internals) return 0;
#     113                 :      85370 :     return m_internals->m_schedulerClient.CallbacksPending();
#     114                 :      85370 : }
#     115                 :            : 
#     116                 :            : CMainSignals& GetMainSignals()
#     117                 :     382937 : {
#     118                 :     382937 :     return g_signals;
#     119                 :     382937 : }
#     120                 :            : 
#     121                 :            : void RegisterSharedValidationInterface(std::shared_ptr<CValidationInterface> callbacks)
#     122                 :     255519 : {
#     123                 :            :     // Each connection captures the shared_ptr to ensure that each callback is
#     124                 :            :     // executed before the subscriber is destroyed. For more details see #18338.
#     125                 :     255519 :     g_signals.m_internals->Register(std::move(callbacks));
#     126                 :     255519 : }
#     127                 :            : 
#     128                 :            : void RegisterValidationInterface(CValidationInterface* callbacks)
#     129                 :        661 : {
#     130                 :            :     // Create a shared_ptr with a no-op deleter - CValidationInterface lifecycle
#     131                 :            :     // is managed by the caller.
#     132                 :        661 :     RegisterSharedValidationInterface({callbacks, [](CValidationInterface*){}});
#     133                 :        661 : }
#     134                 :            : 
#     135                 :            : void UnregisterSharedValidationInterface(std::shared_ptr<CValidationInterface> callbacks)
#     136                 :     254857 : {
#     137                 :     254857 :     UnregisterValidationInterface(callbacks.get());
#     138                 :     254857 : }
#     139                 :            : 
#     140                 :            : void UnregisterValidationInterface(CValidationInterface* callbacks)
#     141                 :     255550 : {
#     142         [ +  + ]:     255550 :     if (g_signals.m_internals) {
#     143                 :     255544 :         g_signals.m_internals->Unregister(callbacks);
#     144                 :     255544 :     }
#     145                 :     255550 : }
#     146                 :            : 
#     147                 :            : void UnregisterAllValidationInterfaces()
#     148                 :        665 : {
#     149         [ +  + ]:        665 :     if (!g_signals.m_internals) {
#     150                 :          2 :         return;
#     151                 :          2 :     }
#     152                 :        663 :     g_signals.m_internals->Clear();
#     153                 :        663 : }
#     154                 :            : 
#     155                 :            : void CallFunctionInValidationInterfaceQueue(std::function<void()> func)
#     156                 :       9745 : {
#     157                 :       9745 :     g_signals.m_internals->m_schedulerClient.AddToProcessQueue(std::move(func));
#     158                 :       9745 : }
#     159                 :            : 
#     160                 :            : void SyncWithValidationInterfaceQueue()
#     161                 :       1994 : {
#     162                 :       1994 :     AssertLockNotHeld(cs_main);
#     163                 :            :     // Block until the validation queue drains
#     164                 :       1994 :     std::promise<void> promise;
#     165                 :       1994 :     CallFunctionInValidationInterfaceQueue([&promise] {
#     166                 :       1994 :         promise.set_value();
#     167                 :       1994 :     });
#     168                 :       1994 :     promise.get_future().wait();
#     169                 :       1994 : }
#     170                 :            : 
#     171                 :            : // Use a macro instead of a function for conditional logging to prevent
#     172                 :            : // evaluating arguments when logging is not enabled.
#     173                 :            : //
#     174                 :            : // NOTE: The lambda captures all local variables by value.
#     175                 :            : #define ENQUEUE_AND_LOG_EVENT(event, fmt, name, ...)           \
#     176                 :     159230 :     do {                                                       \
#     177                 :     159230 :         auto local_name = (name);                              \
#     178                 :     159230 :         LOG_EVENT("Enqueuing " fmt, local_name, __VA_ARGS__);  \
#     179                 :     159230 :         m_internals->m_schedulerClient.AddToProcessQueue([=] { \
#     180 [ +  - ][ +  - ]:     158604 :             LOG_EVENT(fmt, local_name, __VA_ARGS__);           \
#         [ +  - ][ +  - ]
#         [ +  - ][ +  - ]
#         [ +  + ][ +  + ]
#     181                 :     158604 :             event();                                           \
#     182                 :     158604 :         });                                                    \
#     183                 :     159230 :     } while (0)
#     184                 :            : 
#     185                 :            : #define LOG_EVENT(fmt, ...) \
#     186                 :     453713 :     LogPrint(BCLog::VALIDATION, fmt "\n", __VA_ARGS__)
#     187                 :            : 
#     188                 :      64007 : void CMainSignals::UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload) {
#     189                 :            :     // Dependencies exist that require UpdatedBlockTip events to be delivered in the order in which
#     190                 :            :     // the chain actually updates. One way to ensure this is for the caller to invoke this signal
#     191                 :            :     // in the same critical section where the chain is updated
#     192                 :            : 
#     193                 :      64007 :     auto event = [pindexNew, pindexFork, fInitialDownload, this] {
#     194                 :     108193 :         m_internals->Iterate([&](CValidationInterface& callbacks) { callbacks.UpdatedBlockTip(pindexNew, pindexFork, fInitialDownload); });
#     195                 :      64007 :     };
#     196 [ +  - ][ +  + ]:      64007 :     ENQUEUE_AND_LOG_EVENT(event, "%s: new block hash=%s fork block hash=%s (in IBD=%s)", __func__,
#     197                 :      64007 :                           pindexNew->GetBlockHash().ToString(),
#     198                 :      64007 :                           pindexFork ? pindexFork->GetBlockHash().ToString() : "null",
#     199                 :      64007 :                           fInitialDownload);
#     200                 :      64007 : }
#     201                 :            : 
#     202                 :      20131 : void CMainSignals::TransactionAddedToMempool(const CTransactionRef& tx, uint64_t mempool_sequence) {
#     203                 :      20131 :     auto event = [tx, mempool_sequence, this] {
#     204                 :      40063 :         m_internals->Iterate([&](CValidationInterface& callbacks) { callbacks.TransactionAddedToMempool(tx, mempool_sequence); });
#     205                 :      20131 :     };
#     206         [ +  - ]:      20131 :     ENQUEUE_AND_LOG_EVENT(event, "%s: txid=%s wtxid=%s", __func__,
#     207                 :      20131 :                           tx->GetHash().ToString(),
#     208                 :      20131 :                           tx->GetWitnessHash().ToString());
#     209                 :      20131 : }
#     210                 :            : 
#     211                 :        635 : void CMainSignals::TransactionRemovedFromMempool(const CTransactionRef& tx, MemPoolRemovalReason reason, uint64_t mempool_sequence) {
#     212                 :        635 :     auto event = [tx, reason, mempool_sequence, this] {
#     213                 :        994 :         m_internals->Iterate([&](CValidationInterface& callbacks) { callbacks.TransactionRemovedFromMempool(tx, reason, mempool_sequence); });
#     214                 :        635 :     };
#     215         [ +  - ]:        635 :     ENQUEUE_AND_LOG_EVENT(event, "%s: txid=%s wtxid=%s", __func__,
#     216                 :        635 :                           tx->GetHash().ToString(),
#     217                 :        635 :                           tx->GetWitnessHash().ToString());
#     218                 :        635 : }
#     219                 :            : 
#     220                 :      68162 : void CMainSignals::BlockConnected(const std::shared_ptr<const CBlock> &pblock, const CBlockIndex *pindex) {
#     221                 :      68162 :     auto event = [pblock, pindex, this] {
#     222                 :     113493 :         m_internals->Iterate([&](CValidationInterface& callbacks) { callbacks.BlockConnected(pblock, pindex); });
#     223                 :      68162 :     };
#     224         [ +  - ]:      68162 :     ENQUEUE_AND_LOG_EVENT(event, "%s: block hash=%s block height=%d", __func__,
#     225                 :      68162 :                           pblock->GetHash().ToString(),
#     226                 :      68162 :                           pindex->nHeight);
#     227                 :      68162 : }
#     228                 :            : 
#     229                 :            : void CMainSignals::BlockDisconnected(const std::shared_ptr<const CBlock>& pblock, const CBlockIndex* pindex)
#     230                 :       4716 : {
#     231                 :       4716 :     auto event = [pblock, pindex, this] {
#     232                 :       6101 :         m_internals->Iterate([&](CValidationInterface& callbacks) { callbacks.BlockDisconnected(pblock, pindex); });
#     233                 :       4716 :     };
#     234         [ +  - ]:       4716 :     ENQUEUE_AND_LOG_EVENT(event, "%s: block hash=%s block height=%d", __func__,
#     235                 :       4716 :                           pblock->GetHash().ToString(),
#     236                 :       4716 :                           pindex->nHeight);
#     237                 :       4716 : }
#     238                 :            : 
#     239                 :       1579 : void CMainSignals::ChainStateFlushed(const CBlockLocator &locator) {
#     240                 :       1579 :     auto event = [locator, this] {
#     241                 :       1406 :         m_internals->Iterate([&](CValidationInterface& callbacks) { callbacks.ChainStateFlushed(locator); });
#     242                 :        953 :     };
#     243 [ +  - ][ +  + ]:       1579 :     ENQUEUE_AND_LOG_EVENT(event, "%s: block hash=%s", __func__,
#     244                 :       1579 :                           locator.IsNull() ? "null" : locator.vHave.front().ToString());
#     245                 :       1579 : }
#     246                 :            : 
#     247                 :      76922 : void CMainSignals::BlockChecked(const CBlock& block, const BlockValidationState& state) {
#     248         [ +  - ]:      76922 :     LOG_EVENT("%s: block hash=%s state=%s", __func__,
#     249                 :      76922 :               block.GetHash().ToString(), state.ToString());
#     250                 :     127061 :     m_internals->Iterate([&](CValidationInterface& callbacks) { callbacks.BlockChecked(block, state); });
#     251                 :      76922 : }
#     252                 :            : 
#     253                 :      58957 : void CMainSignals::NewPoWValidBlock(const CBlockIndex *pindex, const std::shared_ptr<const CBlock> &block) {
#     254         [ +  - ]:      58957 :     LOG_EVENT("%s: block hash=%s", __func__, block->GetHash().ToString());
#     255                 :     107273 :     m_internals->Iterate([&](CValidationInterface& callbacks) { callbacks.NewPoWValidBlock(pindex, block); });
#     256                 :      58957 : }

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