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validation: rename snapshot chainstate dir

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This changes the snapshot's leveldb chainstate dir name from
`chainstate_[blockhash]` to `chainstate_snapshot`. This simplifies
later logic that loads snapshot data, and enforces the limitation
of a single snapshot at any given time.

Since we still need to persis the blockhash of the base block, we
write that out to a file (`chainstate_snapshot/base_blockhash`) for
later use during initialization, so that we can reinitialize the
snapshot chainstate.

Co-authored-by: Russell Yanofsky <russ@yanofsky.org>
This commit is contained in:
James O'Beirne 2022-04-20 14:59:02 -04:00
parent d14bebf100
commit f9f1735f13
7 changed files with 134 additions and 6 deletions
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12
src/validation.cpp
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@ -1515,7 +1515,7 @@ void Chainstate::InitCoinsDB(
fs::path leveldb_name)
{
if (m_from_snapshot_blockhash) {
leveldb_name += "_" + m_from_snapshot_blockhash->ToString();
leveldb_name += node::SNAPSHOT_CHAINSTATE_SUFFIX;
}
m_coins_views = std::make_unique<CoinsViews>(
@ -4837,9 +4837,17 @@ bool ChainstateManager::ActivateSnapshot(
static_cast<size_t>(current_coinstip_cache_size * SNAPSHOT_CACHE_PERC));
}
const bool snapshot_ok = this->PopulateAndValidateSnapshot(
bool snapshot_ok = this->PopulateAndValidateSnapshot(
*snapshot_chainstate, coins_file, metadata);
// If not in-memory, persist the base blockhash for use during subsequent
// initialization.
if (!in_memory) {
LOCK(::cs_main);
if (!node::WriteSnapshotBaseBlockhash(*snapshot_chainstate)) {
snapshot_ok = false;
}
}
if (!snapshot_ok) {
WITH_LOCK(::cs_main, this->MaybeRebalanceCaches());
return false;