public MerkleTreePruningCursor(UInt256 blockHash, LightningTransaction txn, LightningDatabase db, LightningCursor cursor)
{
this.blockHash = blockHash;
this.db = db;
this.txn = txn;
this.cursor = cursor;
}
public static void Put <TKey, TValue>(this LightningCursor cur, TKey key, TValue value, PutOptions options = PutOptions.None)
{
var keyBytes = cur.ToBytes(key);
var valueBytes = cur.ToBytes(value);
cur.Put(keyBytes, valueBytes, options);
}
public static IEnumerable <ValueTuple <MDBValue, MDBValue> > AsEnumerable(this LightningCursor cursor)
{
while (cursor.Next() == MDBResultCode.Success)
{
var(resultCode, key, value) = cursor.GetCurrent();
resultCode.ThrowOnError();
yield return(key, value);
}
}
public static KeyValuePair <TKey, TValue> GetCurrent <TKey, TValue>(this LightningCursor cursor)
{
var pair = cursor.GetCurrent();
var key = cursor.Database.FromBytes <TKey>(pair.Key);
var value = cursor.Database.FromBytes <TValue>(pair.Value);
return(new KeyValuePair <TKey, TValue>(key, value));
}
private static bool CursorMove <TKey, TValue>(LightningCursor cur, Func <KeyValuePair <byte[], byte[]>?> mover, out KeyValuePair <TKey, TValue> pair)
{
var op = CursorMoveBy(cur, mover);
if (!op.PairExists)
{
pair = default(KeyValuePair <TKey, TValue>);
return(false);
}
else
{
pair = op.Pair <TKey, TValue>();
return(true);
}
}
public CursorGetByOperation(LightningCursor cur, KeyValuePair <byte[], byte[]>?pair)
{
_cur = cur;
_pair = pair;
}
public static void Delete(this LightningCursor cur, bool removeAllDuplicateData = true)
{
cur.Delete(
removeAllDuplicateData ? CursorDeleteOption.NoDuplicateData : CursorDeleteOption.None);
}
internal static T FromBytes <T>(this LightningCursor cur, byte[] bytes)
{
return(cur.Database.FromBytes <T>(bytes));
}
internal static byte[] ToBytes <T>(this LightningCursor cur, T instance)
{
return(cur.Database.ToBytes(instance));
}
public static CursorGetByOperation MoveNextDuplicateBy(this LightningCursor cur)
{
return(CursorMoveBy(cur, cur.MoveNextDuplicate));
}
private static CursorGetByOperation CursorMoveBy(LightningCursor cur, Func <KeyValuePair <byte[], byte[]>?> mover)
{
return(new CursorGetByOperation(cur, mover.Invoke()));
}
public static bool GetCurrent <TKey, TValue>(this LightningCursor cur, out KeyValuePair <TKey, TValue> pair)
{
return(CursorMove <TKey, TValue>(cur, cur.GetCurrent, out pair));
}
public static CursorGetByOperation GetCurrentBy(this LightningCursor cur)
{
return(CursorMoveBy(cur, cur.GetCurrent));
}
public static bool MoveToLast <TKey, TValue>(this LightningCursor cur, out KeyValuePair <TKey, TValue> pair)
{
return(CursorMove <TKey, TValue>(cur, cur.MoveToLast, out pair));
}
public static CursorGetByOperation MoveToLastBy(this LightningCursor cur)
{
return(CursorMoveBy(cur, cur.MoveToLast));
}
private static long ReadInternal(IEnumerable<uint> ids, PerfTracker perfTracker, LightningEnvironment env,
LightningDatabase db)
{
using (var tx = env.BeginTransaction(LightningDB.TransactionBeginFlags.ReadOnly))
using (var cursor = new LightningCursor(db, tx))
{
long v = 0;
foreach (var id in ids)
{
var value = cursor.MoveTo(Encoding.UTF8.GetBytes(id.ToString("0000000000000000")));
v += value.Value.Length;
//Debug.Assert(value != null);
}
return v;
}
}
public static bool MoveNextDuplicate <TKey, TValue>(this LightningCursor cur, out KeyValuePair <TKey, TValue> pair)
{
return(CursorMove <TKey, TValue>(cur, cur.MoveNextDuplicate, out pair));
}