async Task <bool> DownloadBlockSlices(RemoteSyncItem remote, ChainSyncItem chainSyncItem)
{
var chainType = chainSyncItem.ChainType;
var chainId = chainSyncItem.ChainId;
var chainIndex = chainSyncItem.ChainIndex;
chainSyncItem.UpdateLastBlockInfo((await remote.Client.DownloadLastBlockInfo(chainType, chainId, chainIndex)).Data);
var lastBlockId = chainSyncItem.BlockState.LastBlockId;
if (lastBlockId <= Protocol.InvalidBlockId)
{
Log.Debug($"Skipping block slice download for chain {chainId}/{chainIndex}, blockid invalid.", this);
return(true);
}
var remoteLastAvailableSlice = BlockSliceInfo.GetSliceIndex(lastBlockId) - 1;
if (remoteLastAvailableSlice < 0) // -1: ignore last "hot" slice
{
Log.Debug($"Skipping block slice download for chain {chainId}/{chainIndex}, no available remote stored slice found.", this);
return(true);
}
var localStartSlice = 0L;
var localLast = BlockStorage.GetBlockSlices(_storage, chainType, chainId, chainIndex, true).LastOrDefault();
if (localLast.Value != null)
{
localStartSlice = localLast.Value.SliceIndex + 1;
}
if (!(chainSyncItem.LowestFoundBlockSliceId <= localStartSlice))
{
Log.Error($"Download block slices for chain {chainId}/{chainIndex} failed, last local slice is {localStartSlice}, lowest remote slice found is {chainSyncItem.LowestFoundBlockSliceId}.", this);
return(false);
}
var count = 0;
for (var sliceIndex = localStartSlice; sliceIndex <= remoteLastAvailableSlice; sliceIndex++)
{
Log.Trace($"Downloading block slice {sliceIndex}/{remoteLastAvailableSlice} for chain {chainId}/{chainIndex}.", this);
var sliceData = (await remote.Client.DownloadBlockSlice(_storage, chainType, chainId, chainIndex, sliceIndex)).Data;
var error = false;
if (sliceData == null || !sliceData.Move())
{
Log.Trace($"Block slice {sliceIndex} download failed.", this);
sliceData?.Delete();
error = true;
}
sliceData?.Dispose();
if (error)
{
return(false);
}
count++;
}
if (count > 0)
{
return(await DownloadBlockSlices(remote, chainSyncItem));
}
return(true);
}