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kernel: Add functions to read block from disk to C header

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This adds functions for reading a block from disk with a retrieved block
tree entry. External services that wish to build their own index, or
analyze blocks can use this to retrieve block data.

The block tree can now be traversed from the tip backwards. This is
guaranteed to work, since the chainstate maintains an internal block
tree index in memory and every block (besides the genesis) has an
ancestor.

The user can use this function to iterate through all blocks in the
chain (starting from the tip). The tip is retrieved from a separate
`Chain` object, which allows distinguishing whether entries are
currently in the best chain. Once the block tree entry for the genesis
block is reached a nullptr is returned if the user attempts to get the
previous entry.
This commit is contained in:
TheCharlatan
2024-06-01 13:03:31 +02:00
parent a263a4caf2
commit 09d0f62638
4 changed files with 179 additions and 1 deletions
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38
src/kernel/bitcoinkernel.cpp
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@@ -484,6 +484,7 @@ struct btck_Context : Handle<btck_Context, std::shared_ptr<const Context>> {};
struct btck_ChainParameters : Handle<btck_ChainParameters, CChainParams> {};
struct btck_ChainstateManagerOptions : Handle<btck_ChainstateManagerOptions, ChainstateManagerOptions> {};
struct btck_ChainstateManager : Handle<btck_ChainstateManager, ChainMan> {};
struct btck_Chain : Handle<btck_Chain, CChain> {};
btck_Transaction* btck_transaction_create(const void* raw_transaction, size_t raw_transaction_len)
{
@@ -769,6 +770,16 @@ void btck_context_destroy(btck_Context* context)
delete context;
}
const btck_BlockTreeEntry* btck_block_tree_entry_get_previous(const btck_BlockTreeEntry* entry)
{
if (!btck_BlockTreeEntry::get(entry).pprev) {
LogInfo("Genesis block has no previous.");
return nullptr;
}
return btck_BlockTreeEntry::ref(btck_BlockTreeEntry::get(entry).pprev);
}
btck_ValidationMode btck_block_validation_state_get_validation_mode(const btck_BlockValidationState* block_validation_state_)
{
auto& block_validation_state = btck_BlockValidationState::get(block_validation_state_);
@@ -983,6 +994,16 @@ void btck_block_destroy(btck_Block* block)
delete block;
}
btck_Block* btck_block_read(const btck_ChainstateManager* chainman, const btck_BlockTreeEntry* entry)
{
auto block{std::make_shared<CBlock>()};
if (!btck_ChainstateManager::get(chainman).m_chainman->m_blockman.ReadBlock(*block, btck_BlockTreeEntry::get(entry))) {
LogError("Failed to read block.");
return nullptr;
}
return btck_Block::create(block);
}
int btck_chainstate_manager_process_block(
btck_ChainstateManager* chainman,
const btck_Block* block,
@@ -995,3 +1016,20 @@ int btck_chainstate_manager_process_block(
}
return result ? 0 : -1;
}
const btck_Chain* btck_chainstate_manager_get_active_chain(const btck_ChainstateManager* chainman)
{
return btck_Chain::ref(&WITH_LOCK(btck_ChainstateManager::get(chainman).m_chainman->GetMutex(), return btck_ChainstateManager::get(chainman).m_chainman->ActiveChain()));
}
const btck_BlockTreeEntry* btck_chain_get_tip(const btck_Chain* chain)
{
LOCK(::cs_main);
return btck_BlockTreeEntry::ref(btck_Chain::get(chain).Tip());
}
int btck_chain_get_height(const btck_Chain* chain)
{
LOCK(::cs_main);
return btck_Chain::get(chain).Height();
}