async Task RetrieveBlocks(IBlocksRetrieverHandler handler)
{
var cancellationToken = this.retrieveBlocksCancelSource.Token;
var height = await handler.GetBlockHintAsync(cancellationToken);
while (true)
{
// Get block.
Block block;
using (var rpc = await this.rpc.CreateChainInformationRpcAsync(cancellationToken))
{
try
{
block = await rpc.GetBlockAsync(height, cancellationToken);
}
catch (RPCException ex) when(ex.RPCCode == RPCErrorCode.RPC_INVALID_PARAMETER)
{
// Invalid block height.
await WaitNewBlockAsync(cancellationToken);
continue;
}
}
// Execute handler.
height = await handler.ProcessBlockAsync(block, height, cancellationToken);
}
}
async Task RetrieveBlocks(IBlocksRetrieverHandler handler)
{
var cancellationToken = this.retrieveBlocksCancelSource.Token;
var height = await handler.GetStartBlockAsync(cancellationToken);
while (true)
{
// Get block.
Block block;
using (var rpc = await this.rpc.CreateChainInformationRpcAsync(cancellationToken))
{
try
{
block = await rpc.GetBlockAsync(height, cancellationToken);
}
catch (RPCException ex) when(ex.RPCCode == RPCErrorCode.RPC_INVALID_PARAMETER) // Invalid height.
{
var info = await rpc.GetChainInfoAsync(cancellationToken);
var blocks = (int)info.Blocks;
if (blocks >= height)
{
// There is a new block already.
continue;
}
if (blocks == height - 1)
{
// A block of the target height is not available right now.
await WaitNewBlockAsync(cancellationToken);
continue;
}
// There is a re-org happened.
await handler.DiscardBlocksAsync(blocks, cancellationToken);
height = blocks;
continue;
}
}
// Execute handler.
height = await handler.ProcessBlockAsync(block, height, cancellationToken);
}
}
