public async Task <IActionResult> Mine()
{
var proof = await _blockchain.ProofOfWorkAsync(_blockchain.LastBlock.Proof);
await _blockchain.AddTransactionAsync(new Transaction {
Sender = "0",
Recipient = _settings.NodeIdentifier,
Amount = 1
});
var block = await _blockchain.AddBlockAsync(proof, Blockchain.HashBlock(_blockchain.LastBlock));
return(Ok(block));
}
public async Task <IActionResult> Mine(string rewardAddress)
{
try
{
var newBlock = await _miner.MineAsync(rewardAddress);
var block = await _blockchain.AddBlockAsync(newBlock);
return(Created($"blockchain/blocks/{block.Index}", block));
}
catch (Exception ex)
{
if (ex is BlockAssertionException && ex.Message.StartsWith("Invalid index"))
{
return(StatusCode((int)HttpStatusCode.Conflict,
"A new block was added before we were able to mine one"));
}
throw;
}
}
public async Task <bool?> CheckReceivedBlocksAsync(params Block[] blocks)
{
var receivedBlocks = blocks.OrderBy(x => x.Index).ToList();
var latestBlockReceived = receivedBlocks[receivedBlocks.Count - 1];
var latestBlockHeld = await _blockchain.GetLastBlockAsync();
// If the received blockchain is not longer than blockchain. Do nothing.
if (latestBlockReceived.Index <= latestBlockHeld.Index)
{
_logger?.LogInformation($"Received blockchain is not longer than blockchain. Do nothing.");
return(false);
}
_logger?.LogInformation($"Blockchain possibly behind. We got: {latestBlockHeld.Index}, Peer got: {latestBlockReceived.Index}");
if (latestBlockHeld.Hash == latestBlockReceived.PreviousHash)
{
// We can append the received block to our chain
_logger?.LogInformation("Appending received block to our chain");
await _blockchain.AddBlockAsync(latestBlockReceived);
return(true);
}
if (receivedBlocks.Count == 1)
{
// We have to query the chain from our peer
_logger?.LogInformation("Querying chain from our peers");
Broadcast(async node => await GetBlocksAsync(node));
return(null);
}
// Received blockchain is longer than current blockchain
_logger?.LogInformation("Received blockchain is longer than current blockchain");
await _blockchain.ReplaceChainAsync(receivedBlocks);
return(true);
}