/// <inheritdoc />
public async Task <UnspentOutputs> GetUnspentTransactionAsync(uint256 trxid)
{
CoinViews.FetchCoinsResponse response = null;
if (this.ConsensusLoop?.UTXOSet != null)
{
response = await this.ConsensusLoop.UTXOSet.FetchCoinsAsync(new[] { trxid }).ConfigureAwait(false);
}
return(response?.UnspentOutputs?.SingleOrDefault());
}
/// <inheritdoc />
public override Task <FetchCoinsResponse> FetchCoinsAsync(uint256[] txIds)
{
Task <FetchCoinsResponse> task = Task.Run(() =>
{
this.logger.LogTrace("({0}.{1}:{2})", nameof(txIds), nameof(txIds.Length), txIds?.Length);
FetchCoinsResponse res = null;
using (DBreeze.Transactions.Transaction transaction = this.dbreeze.GetTransaction())
{
transaction.SynchronizeTables("BlockHash", "Coins");
transaction.ValuesLazyLoadingIsOn = false;
using (new StopwatchDisposable(o => this.PerformanceCounter.AddQueryTime(o)))
{
uint256 blockHash = this.GetCurrentHash(transaction);
UnspentOutputs[] result = new UnspentOutputs[txIds.Length];
this.PerformanceCounter.AddQueriedEntities(txIds.Length);
int i = 0;
foreach (uint256 input in txIds)
{
Row <byte[], Coins> row = transaction.Select <byte[], Coins>("Coins", input.ToBytes(false));
UnspentOutputs outputs = row.Exists ? new UnspentOutputs(input, row.Value) : null;
result[i++] = outputs;
}
res = new FetchCoinsResponse(result, blockHash);
}
}
this.logger.LogTrace("(-):*.{0}='{1}',*.{2}.{3}={4}", nameof(res.BlockHash), res.BlockHash, nameof(res.UnspentOutputs), nameof(res.UnspentOutputs.Length), res.UnspentOutputs.Length);
return(res);
});
return(task);
}
/// <inheritdoc />
public override async Task <FetchCoinsResponse> FetchCoinsAsync(uint256[] txIds)
{
Guard.NotNull(txIds, nameof(txIds));
this.logger.LogTrace("({0}.{1}:{2})", nameof(txIds), nameof(txIds.Length), txIds.Length);
FetchCoinsResponse result = null;
UnspentOutputs[] outputs = new UnspentOutputs[txIds.Length];
List <int> miss = new List <int>();
List <uint256> missedTxIds = new List <uint256>();
using (this.lockobj.LockRead())
{
this.WaitOngoingTasks();
for (int i = 0; i < txIds.Length; i++)
{
CacheItem cache;
if (!this.unspents.TryGetValue(txIds[i], out cache))
{
this.logger.LogTrace("Cache missed for transaction ID '{0}'.", txIds[i]);
miss.Add(i);
missedTxIds.Add(txIds[i]);
}
else
{
this.logger.LogTrace("Cache hit for transaction ID '{0}'.", txIds[i]);
outputs[i] = cache.UnspentOutputs == null ? null :
cache.UnspentOutputs.IsPrunable ? null :
cache.UnspentOutputs.Clone();
}
}
this.PerformanceCounter.AddMissCount(miss.Count);
this.PerformanceCounter.AddHitCount(txIds.Length - miss.Count);
}
this.logger.LogTrace("{0} cache missed transaction needs to be loaded from underlaying coinview.", missedTxIds.Count);
FetchCoinsResponse fetchedCoins = await this.Inner.FetchCoinsAsync(missedTxIds.ToArray()).ConfigureAwait(false);
using (this.lockobj.LockWrite())
{
this.flushingTask.Wait();
uint256 innerblockHash = fetchedCoins.BlockHash;
if (this.blockHash == null)
{
Debug.Assert(this.unspents.Count == 0);
this.innerBlockHash = innerblockHash;
this.blockHash = this.innerBlockHash;
}
for (int i = 0; i < miss.Count; i++)
{
int index = miss[i];
UnspentOutputs unspent = fetchedCoins.UnspentOutputs[i];
outputs[index] = unspent;
CacheItem cache = new CacheItem();
cache.ExistInInner = unspent != null;
cache.IsDirty = false;
cache.UnspentOutputs = unspent;
cache.OriginalOutputs = unspent?.Outputs.ToArray();
this.unspents.TryAdd(txIds[index], cache);
}
result = new FetchCoinsResponse(outputs, this.blockHash);
}
int cacheEntryCount = this.CacheEntryCount;
if (cacheEntryCount > this.MaxItems)
{
this.logger.LogTrace("Cache is full now with {0} entries, evicting ...", cacheEntryCount);
this.Evict();
}
this.logger.LogTrace("(-):*.{0}='{1}',*.{2}.{3}={4}", nameof(result.BlockHash), result.BlockHash, nameof(result.UnspentOutputs), nameof(result.UnspentOutputs.Length), result.UnspentOutputs.Length);
return(result);
}
/// <summary>
/// Retrieves the block hash of the current tip of the coinview.
/// </summary>
/// <returns>Block hash of the current tip of the coinview.</returns>
public async Task <uint256> GetBlockHashAsync()
{
FetchCoinsResponse response = await this.FetchCoinsAsync(new uint256[0]).ConfigureAwait(false);
return(response.BlockHash);
}