void ExplainCreateOrUpdate(ITrlVisitor visitor, ReadOnlySpan <byte> key, int valueLength,
ReadOnlySpan <byte> firstBytes)
{
switch (key[0])
{
case 0:
visitor.OperationDetail("metadata");
break;
case 1:
{
var oid = SkipByteAndReadVUInt64(key);
var valueReader = new SpanReader(firstBytes);
var tableId = valueReader.ReadVUInt32();
visitor.UpsertObject(oid, tableId, key.Length, valueLength);
}
break;
case 2:
{
var oid = SkipByteAndReadVUInt64(key);
visitor.UpsertODBDictionary(oid, key.Length, valueLength);
}
break;
case 3:
{
var relationIdx = SkipByteAndReadVUInt64(key);
visitor.UpsertRelationValue(relationIdx, key.Length, valueLength);
}
break;
case 4:
{
var reader = new SpanReader(key);
reader.SkipBlock(1);
var relationIdx = reader.ReadVUInt64();
var skIdx = reader.ReadUInt8();
visitor.UpsertRelationSecondaryKey(relationIdx, skIdx, key.Length, valueLength);
}
break;
}
}
public void Iterate(ITrlVisitor visitor)
{
bool afterTemporaryEnd = false;
Span <byte> trueValue = stackalloc byte[12];
var reader = new SpanReader(_readerController);
SkipUntilNextTransaction(ref reader);
while (!reader.Eof)
{
var command = (KVCommandType)reader.ReadUInt8();
if (command == 0 && afterTemporaryEnd)
{
return;
}
afterTemporaryEnd = false;
visitor.StartOperation(command & KVCommandType.CommandMask);
switch (command & KVCommandType.CommandMask)
{
case KVCommandType.CreateOrUpdateDeprecated:
case KVCommandType.CreateOrUpdate:
{
var keyLen = reader.ReadVInt32();
var valueLen = reader.ReadVInt32();
var key = new byte[keyLen];
reader.ReadBlock(key);
var keyBuf = ByteBuffer.NewAsync(key);
if ((command & KVCommandType.FirstParamCompressed) != 0)
{
_compression.DecompressKey(ref keyBuf);
}
trueValue.Clear();
if (valueLen <= MaxValueSizeInlineInMemory &&
(command & KVCommandType.SecondParamCompressed) == 0)
{
reader.ReadBlock(ref MemoryMarshal.GetReference(trueValue), (uint)valueLen);
}
else
{
var partLen = Math.Min(12, valueLen);
reader.ReadBlock(ref MemoryMarshal.GetReference(trueValue), (uint)partLen);
reader.SkipBlock(valueLen - partLen);
}
ExplainCreateOrUpdate(visitor, keyBuf.AsSyncReadOnlySpan(), valueLen, trueValue);
}
break;
case KVCommandType.EraseOne:
{
var keyLen = reader.ReadVInt32();
reader.SkipBlock(keyLen);
}
break;
case KVCommandType.EraseRange:
{
var keyLen1 = reader.ReadVInt32();
var keyLen2 = reader.ReadVInt32();
reader.SkipBlock(keyLen1);
reader.SkipBlock(keyLen2);
}
break;
case KVCommandType.DeltaUlongs:
{
reader.SkipVUInt32();
reader.SkipVUInt64();
}
break;
case KVCommandType.TransactionStart:
if (!reader.CheckMagic(MagicStartOfTransaction))
{
throw new Exception("Invalid transaction magic");
}
visitor.OperationDetail($"file pos: {_readerController.GetCurrentPosition(reader)}");
break;
case KVCommandType.CommitWithDeltaUlong:
var delta = reader.ReadVUInt64();
visitor.OperationDetail($"delta: {delta}");
break;
case KVCommandType.EndOfFile:
visitor.OperationDetail($"position: {reader!.Controller!.GetCurrentPosition(reader)}");
return;
case KVCommandType.TemporaryEndOfFile:
afterTemporaryEnd = true;
break;
}
visitor.EndOperation();
}
}