public void ProcessNextBlock(MiningJobRequestModel miningJobRM)
{
bool isFound = this.blockCandidates.TryGetValue(miningJobRM.MinerAddress, out BlockCandidate foundBlockCandidate);
if (!isFound)
{
throw new Exception("No miner job associated with this miner address.");
}
if (foundBlockCandidate.BlockDataHash != miningJobRM.BlockDataHash)
{
throw new Exception("Mining job block data hash is different than the hash of the prepared block candidate.");
}
if (this.blocks.Any() && foundBlockCandidate.Index <= this.blocks.Last().Index)
{
this.SyncNode(foundBlockCandidate.Index);
throw new Exception($"Sorry but a block with index {foundBlockCandidate.Index} was already mined.");
}
if (!this.IsFoundBlockHashValid(miningJobRM))
{
throw new Exception("Found block hash is invalid");
}
//TODO: During synchronization with other nodes, a check for valid hash for incoming blocks must be done as well.
Block newBlock = this.CreateNewBlock(miningJobRM, foundBlockCandidate);
this.blocks.Add(newBlock);
this.transactionService.ClearAllAddedToBlockPendingTransactions(newBlock.ConfirmedTransactions);
this.blockCandidates.Clear();
}
private bool IsFoundBlockHashValid(MiningJobRequestModel miningJobRM)
{
// Can be added to utils if needed elsewhere
string timestampIso8601 = miningJobRM.Timestamp.ToString("yyyy-MM-ddTHH:mm:ss.fffZ");
string combinedInput = $"{miningJobRM.BlockDataHash}{timestampIso8601}{miningJobRM.Nonce}";
string calculatedHash = Crypto.CalculateSHA256ToString(combinedInput);
return(miningJobRM.MinedBlockHash == calculatedHash);
}
public IActionResult SubmitMinedJob([FromBody] MiningJobRequestModel miningJobRM)
{
try
{
this.blockService.ProcessNextBlock(miningJobRM);
return(Ok("New block sucessfully added to the chain."));
}
catch (Exception ex)
{
return(BadRequest($"Error: {ex}"));
}
}
private Block CreateNewBlock(MiningJobRequestModel miningJobRM, BlockCandidate blockCandidate)
{
Block newBlock = new Block()
{
Index = blockCandidate.Index,
ConfirmedTransactions = blockCandidate.ConfirmedTransactions,
Difficulty = blockCandidate.Difficulty,
PreviousBlockHash = blockCandidate.PreviousBlockHash,
MinedBy = blockCandidate.MinedBy,
BlockDataHash = blockCandidate.BlockDataHash,
Nonce = miningJobRM.Nonce,
DateCreated = miningJobRM.Timestamp,
BlockHash = miningJobRM.MinedBlockHash
};
return(newBlock);
}
