/// <summary>
/// Get the merkle path of a transaction.
/// </summary>
/// <param name="transactionId"></param>
/// <returns></returns>
public async Task <MerklePathDto> GetMerklePathByTransactionIdAsync(string transactionId)
{
Hash transactionIdHash;
try
{
transactionIdHash = HashHelper.HexStringToHash(transactionId);
}
catch
{
throw new UserFriendlyException(Error.Message[Error.InvalidTransactionId],
Error.InvalidTransactionId.ToString());
}
var transactionResult = await GetMinedTransactionResultAsync(transactionIdHash);
var blockHash = transactionResult.BlockHash;
var blockInfo = await _blockchainService.GetBlockByHashAsync(blockHash);
var transactionIds = blockInfo.Body.TransactionIds;
var index = transactionIds.IndexOf(transactionIdHash);
if (index == -1)
{
throw new UserFriendlyException(Error.Message[Error.NotFound], Error.NotFound.ToString());
}
var leafNodes = await GetLeafNodesAsync(blockInfo.TransactionIds);
var binaryMerkleTree = BinaryMerkleTree.FromLeafNodes(leafNodes);
var path = binaryMerkleTree.GenerateMerklePath(index);
var merklePath = new MerklePathDto {
MerklePathNodes = new List <MerklePathNodeDto>()
};
foreach (var node in path.MerklePathNodes)
{
merklePath.MerklePathNodes.Add(new MerklePathNodeDto
{
Hash = node.Hash.ToHex(), IsLeftChildNode = node.IsLeftChildNode
});
}
return(merklePath);
}
/// <summary>
/// Get the merkle path of a transaction.
/// </summary>
/// <param name="transactionId"></param>
/// <returns></returns>
public async Task <MerklePathDto> GetMerklePathByTransactionIdAsync(string transactionId)
{
Hash transactionIdHash;
try
{
transactionIdHash = HashHelper.HexStringToHash(transactionId);
}
catch
{
throw new UserFriendlyException(Error.Message[Error.InvalidTransactionId],
Error.InvalidTransactionId.ToString());
}
var transactionResult = await GetTransactionResultAsync(transactionIdHash);
switch (transactionResult.Status)
{
case TransactionResultStatus.Mined:
{
var block = await _blockchainService.GetBlockAtHeightAsync(transactionResult.BlockNumber);
transactionResult.BlockHash = block.GetHash();
break;
}
case TransactionResultStatus.Failed:
throw new UserFriendlyException(Error.Message[Error.NotFound], Error.NotFound.ToString());
case TransactionResultStatus.NotExisted:
throw new UserFriendlyException(Error.Message[Error.NotFound], Error.NotFound.ToString());
}
var blockHash = transactionResult.BlockHash;
var blockInfo = await _blockchainService.GetBlockByHashAsync(blockHash);
var transactionIds = blockInfo.Body.TransactionIds;
var index = transactionIds.IndexOf(transactionIdHash);
if (index == -1)
{
throw new UserFriendlyException(Error.Message[Error.NotFound], Error.NotFound.ToString());
}
var transactionResultList = new List <TransactionResult>();
foreach (var item in blockInfo.TransactionIds)
{
var result = await GetTransactionResultAsync(item);
transactionResultList.Add(result);
}
var transactionResultSet = transactionResultList.Select(txResult => (txResult.TransactionId, txResult.Status));
var leafNodes = new List <Hash>();
foreach (var(txId, status) in transactionResultSet)
{
leafNodes.Add(GetHashCombiningTransactionAndStatus(txId, status));
}
var binaryMerkleTree = BinaryMerkleTree.FromLeafNodes(leafNodes);
var path = binaryMerkleTree.GenerateMerklePath(index);
var merklePath = new MerklePathDto {
MerklePathNodes = new List <MerklePathNodeDto>()
};
foreach (var node in path.MerklePathNodes)
{
merklePath.MerklePathNodes.Add(new MerklePathNodeDto
{
Hash = node.Hash.ToHex(), IsLeftChildNode = node.IsLeftChildNode
});
}
return(merklePath);
}
