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Only load BlockMan in BlockMan member functions

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This commit effectively splits the "load block index itself" logic from
"derive Chainstate variables from loaded block index" logic.

This means that BlockManager::LoadBlockIndex{,DB} will only load what's
relevant to the BlockManager.

I strongly recommend reviewing with the following git-diff flags:
  --color-moved=dimmed_zebra --color-moved-ws=allow-indentation-change
This commit is contained in:
Carl Dong
2022-03-07 21:42:27 -05:00
parent 42e56d9b18
commit c600ee3816
4 changed files with 80 additions and 68 deletions
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65
src/node/blockstorage.cpp
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@@ -211,9 +211,7 @@ CBlockIndex* BlockManager::InsertBlockIndex(const uint256& hash)
return pindex;
}
bool BlockManager::LoadBlockIndex(
const Consensus::Params& consensus_params,
ChainstateManager& chainman)
bool BlockManager::LoadBlockIndex(const Consensus::Params& consensus_params)
{
if (!m_block_tree_db->LoadBlockIndexGuts(consensus_params, [this](const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { return this->InsertBlockIndex(hash); })) {
return false;
@@ -230,26 +228,6 @@ bool BlockManager::LoadBlockIndex(
return pa->nHeight < pb->nHeight;
});
// Find start of assumed-valid region.
int first_assumed_valid_height = std::numeric_limits<int>::max();
for (const CBlockIndex* block : vSortedByHeight) {
if (block->IsAssumedValid()) {
auto chainstates = chainman.GetAll();
// If we encounter an assumed-valid block index entry, ensure that we have
// one chainstate that tolerates assumed-valid entries and another that does
// not (i.e. the background validation chainstate), since assumed-valid
// entries should always be pending validation by a fully-validated chainstate.
auto any_chain = [&](auto fnc) { return std::any_of(chainstates.cbegin(), chainstates.cend(), fnc); };
assert(any_chain([](auto chainstate) { return chainstate->reliesOnAssumedValid(); }));
assert(any_chain([](auto chainstate) { return !chainstate->reliesOnAssumedValid(); }));
first_assumed_valid_height = block->nHeight;
break;
}
}
for (CBlockIndex* pindex : vSortedByHeight) {
if (ShutdownRequested()) return false;
pindex->nChainWork = (pindex->pprev ? pindex->pprev->nChainWork : 0) + GetBlockProof(*pindex);
@@ -275,43 +253,6 @@ bool BlockManager::LoadBlockIndex(
pindex->nStatus |= BLOCK_FAILED_CHILD;
m_dirty_blockindex.insert(pindex);
}
if (pindex->IsAssumedValid() ||
(pindex->IsValid(BLOCK_VALID_TRANSACTIONS) &&
(pindex->HaveTxsDownloaded() || pindex->pprev == nullptr))) {
// Fill each chainstate's block candidate set. Only add assumed-valid
// blocks to the tip candidate set if the chainstate is allowed to rely on
// assumed-valid blocks.
//
// If all setBlockIndexCandidates contained the assumed-valid blocks, the
// background chainstate's ActivateBestChain() call would add assumed-valid
// blocks to the chain (based on how FindMostWorkChain() works). Obviously
// we don't want this since the purpose of the background validation chain
// is to validate assued-valid blocks.
//
// Note: This is considering all blocks whose height is greater or equal to
// the first assumed-valid block to be assumed-valid blocks, and excluding
// them from the background chainstate's setBlockIndexCandidates set. This
// does mean that some blocks which are not technically assumed-valid
// (later blocks on a fork beginning before the first assumed-valid block)
// might not get added to the background chainstate, but this is ok,
// because they will still be attached to the active chainstate if they
// actually contain more work.
//
// Instead of this height-based approach, an earlier attempt was made at
// detecting "holistically" whether the block index under consideration
// relied on an assumed-valid ancestor, but this proved to be too slow to
// be practical.
for (CChainState* chainstate : chainman.GetAll()) {
if (chainstate->reliesOnAssumedValid() ||
pindex->nHeight < first_assumed_valid_height) {
chainstate->setBlockIndexCandidates.insert(pindex);
}
}
}
if (pindex->nStatus & BLOCK_FAILED_MASK && (!chainman.m_best_invalid || pindex->nChainWork > chainman.m_best_invalid->nChainWork)) {
chainman.m_best_invalid = pindex;
}
if (pindex->pprev) {
pindex->BuildSkip();
}
@@ -355,9 +296,9 @@ bool BlockManager::WriteBlockIndexDB()
return true;
}
bool BlockManager::LoadBlockIndexDB(ChainstateManager& chainman)
bool BlockManager::LoadBlockIndexDB()
{
if (!LoadBlockIndex(::Params().GetConsensus(), chainman)) {
if (!LoadBlockIndex(::Params().GetConsensus())) {
return false;
}