// consider taking a backup of the folder ChainLachain in case anything goes wrong
public void ShrinkDb(ulong depth, ulong totalBlocks, bool consistencyCheck)
{
if (dbShrinkStatus != DbShrinkStatus.Stopped)
{
if (dbShrinkDepth is null)
{
throw new Exception("DbCompact process was started but depth was not written. This should not happen.");
}
if (dbShrinkDepth != depth)
{
throw new Exception($"Process was started before with depth {dbShrinkDepth} but was not finished."
+ $" Got new depth {depth}. Use depth {dbShrinkDepth} and finish the process before "
+ "using new depth.");
}
}
DbShrinkUtils.ResetCounter();
switch (dbShrinkStatus)
{
case DbShrinkStatus.Stopped:
if (!CheckIfDbShrinkNecessary(depth, totalBlocks))
{
Logger.LogTrace("Nothing to delete.");
return;
}
SetDbShrinkDepth(depth);
Logger.LogTrace("Starting hard db optimization");
Logger.LogTrace($"Keeping latest {depth} snapshots from last approved snapshot"
+ $"for blocks: {StartingBlockToKeep(depth, totalBlocks)} to {totalBlocks}");
SetDbShrinkStatus(DbShrinkStatus.SaveNodeId);
goto case DbShrinkStatus.SaveNodeId;
case DbShrinkStatus.SaveNodeId:
SaveRecentSnapshotNodeId(depth, totalBlocks);
SetDbShrinkStatus(DbShrinkStatus.DeleteOldSnapshot);
goto case DbShrinkStatus.DeleteOldSnapshot;
case DbShrinkStatus.DeleteOldSnapshot:
Logger.LogTrace($"Deleting nodes from DB that are not reachable from last {depth} snapshots");
ulong fromBlock = GetOldestSnapshotInDb(), toBlock = StartingBlockToKeep(depth, totalBlocks) - 1;
DeleteOldSnapshot(fromBlock, toBlock);
SetDbShrinkStatus(DbShrinkStatus.DeleteNodeId);
goto case DbShrinkStatus.DeleteNodeId;
case DbShrinkStatus.DeleteNodeId:
DeleteRecentSnapshotNodeId(depth, totalBlocks);
SetDbShrinkStatus(DbShrinkStatus.CheckConsistency);
goto case DbShrinkStatus.CheckConsistency;
case DbShrinkStatus.CheckConsistency:
if (consistencyCheck)
{
CheckSnapshots(depth, totalBlocks);
}
Stop();
break;
default:
throw new Exception("invalid db-shrink-status");
}
}
private void Delete(byte[] key, bool tryCommit = true)
{
batch.Delete(key);
var keyHash = key.Keccak();
_memDb[keyHash] = null;
DbShrinkUtils.UpdateCounter();
if (tryCommit && DbShrinkUtils.CycleEnded())
{
Commit();
}
}
private void Save(byte[] key, byte[] content, bool tryCommit = true)
{
batch.Put(key, content);
var keyHash = key.Keccak();
_memDb[keyHash] = content;
DbShrinkUtils.UpdateCounter();
if (tryCommit && DbShrinkUtils.CycleEnded())
{
Commit();
}
}
private void Commit()
{
batch.Commit();
DbShrinkUtils.ResetCounter();
UpdateBatch();
}