public void Sync()
{
var retrieveBlocksTasks = new SyncBlocksTask[_peers.Length];
for (var peerIndex = 0; peerIndex < _peers.Length; peerIndex++)
{
retrieveBlocksTasks[peerIndex] = StartPeerSync(peerIndex);
}
do
{
var tasks = retrieveBlocksTasks.Select(rbt => rbt.Task).ToArray();
// ReSharper disable once CoVariantArrayConversion
Task.WaitAny(tasks);
foreach (var peerTask in retrieveBlocksTasks)
{
ProcessPeerBlocks(peerTask);
}
ProcessPendingBlocks();
} while (SyncBlocks(retrieveBlocksTasks));
//Continue only if block is full, otherwise peer do not have more blocks
/*if (retrieveBlocksTask.Task.Result.Length >= _syncBlockPageSize)
* {
* retrieveBlocksTasks[completeTaskIndex] = StartPeerSync(completeTaskIndex);
* return true;
* }*/
}
private SyncBlocksTask StartPeerSync(int peerIndex, int syncBlockIndex, int syncBlockPageSize)
{
_feedback.SyncChainRetrieveBlocks(syncBlockIndex, syncBlockPageSize, _peers[peerIndex].Client.Host.AbsoluteUri);
var result = new SyncBlocksTask(
syncBlockIndex,
syncBlockPageSize,
_peers[peerIndex].Client.GetBlocksAsync(syncBlockIndex, syncBlockPageSize));
return(result);
}
/// <summary>
/// Try add retrieved peer blocks to block chain or add them as failed to be retried from another peer
/// </summary>
/// <param name="peerBlocksTask"></param>
/// <returns>True if peer are processed successfully</returns>
private void ProcessPeerBlocks(SyncBlocksTask peerBlocksTask)
{
if (peerBlocksTask.Ready)
{
if (peerBlocksTask.AwaitProcessing)
{
if (!TryAddBlocks(peerBlocksTask))
{
FailPeerBlocks(peerBlocksTask);
}
}
peerBlocksTask.Processed = true;
}
}
private bool TryAddBlocks(SyncBlocksTask peerBlocksTask)
{
var peerResult = peerBlocksTask.Task.Result;
if (peerBlocksTask.StartIndex != peerResult[0].Signed.Data.Index)
{
return(false);
}
var peerBlockNextIndex = CalculatePeerBlockNextIndex(peerBlocksTask.StartIndex);
if (peerBlockNextIndex >= 0)
{
return(AddNewChainBlocks(peerBlockNextIndex, peerResult));
}
//Add as pending blocks, as previous blocks are still not synced
_feedback.SyncChainPendingBlocks(peerBlocksTask.StartIndex, peerBlocksTask.Task.Result.Length);
_pendingBlocks.Add(peerBlocksTask.StartIndex, peerBlocksTask);
return(true);
}
private void FailPeerBlocks(SyncBlocksTask peerBlocksTask)
{
_feedback.SyncChainInvalidBlocks(peerBlocksTask.StartIndex, _syncBlockPageSize);
peerBlocksTask.Failed = true;
_missingBlocks.Add(peerBlocksTask.StartIndex, peerBlocksTask);
}
