/// <summary>
/// Runs multichaind in a background process, connecting to a specified blockchain.
/// Optionally callsback on successful launch, determined by multichaind's stdout/err.
/// </summary>
/// <param name="chain">Blockchain connection/status data</param>
/// <param name="clean">Should clean local blockchain directory?</param>
/// <returns>Blockchain connection/status data</returns>
private static async Task <MultichainModel> RunDaemon(MultichainModel chain, bool clean)
{
if (chain.Process != null)
{
try
{
if (!chain.Process.HasExited)
{
return(chain);
}
}
// May throw exception if process has become unassociated
catch (InvalidOperationException)
{
}
Debug.WriteLine($"Restarting Multichaind for chain: {chain.Name}!!");
}
// Get working directory and multichaind.exe path
var evotoDir = MultiChainTools.GetAppDataFolder(allowSubDir: false);
var multichainDPath = Path.Combine(evotoDir, "multichaind.exe");
MultiChainTools.EnsureFileExists(multichainDPath, Resources.multichaind);
var dataDir = MultiChainTools.GetAppDataFolder();
// Clean if required (multichain bug)
if (clean)
{
MultiChainTools.CleanBlockchain(dataDir, chain.Name);
}
Debug.WriteLine(
$"Starting MultiChain connection to {chain.Name}@{chain.Hostname}:{chain.Port} ({chain.LocalPort})");
Debug.WriteLine($"RPC Data: {RpcUser} : {chain.RpcPassword} : {chain.RpcPort}");
var pArgs =
$"{chain.Name}@{chain.Hostname}:{chain.Port} -daemon -datadir={dataDir} -server -port={chain.LocalPort}" +
$" -rpcuser={RpcUser} -rpcpassword={chain.RpcPassword} -rpcport={chain.RpcPort}";
chain.Process = new Process
{
StartInfo =
{
// Stop the process from opening a new window
RedirectStandardOutput = true,
RedirectStandardError = true,
UseShellExecute = false,
CreateNoWindow = true,
// Setup executable and parameters
FileName = multichainDPath,
Arguments = pArgs
}
};
var taskCompletion = new TaskCompletionSource <bool>();
// Connect to outputs
chain.Process.ErrorDataReceived += (sender, args) =>
{
if (string.IsNullOrWhiteSpace(args.Data))
{
return;
}
Debug.WriteLine($"Multichaind Error ({chain.Name}): {args.Data}");
};
chain.Process.OutputDataReceived += (sender, e) =>
{
if (string.IsNullOrWhiteSpace(e.Data))
{
return;
}
Debug.WriteLine($"Multichaind ({chain.Name}): {e.Data}");
if (e.Data.Contains("Node started"))
{
taskCompletion.SetResult(true);
}
};
// Launch process
var success = chain.Process.Start();
if (!success)
{
throw new CouldNotStartProcessException();
}
// Read outputs
chain.Process.BeginOutputReadLine();
chain.Process.BeginErrorReadLine();
chain.Process.EnableRaisingEvents = true;
chain.Process.Exited += (sender, args) =>
{
// May have been disposed
taskCompletion.TrySetResult(false);
};
await Task.Run(() =>
{
if (!taskCompletion.Task.Wait(TimeSpan.FromMinutes(1)))
{
chain.Process.Kill();
throw new CouldNotConnectToBlockchainException("Timed Out");
}
if (!taskCompletion.Task.Result)
{
throw new CouldNotConnectToBlockchainException();
}
});
return(chain);
}
public static async Task CreateBlockchain(string blockchainName)
{
var evotoDir = MultiChainTools.GetAppDataFolder(allowSubDir: false);
var multichainUtilPath = Path.Combine(evotoDir, "multichain-util.exe");
MultiChainTools.EnsureFileExists(multichainUtilPath, Resources.multichain_util);
Debug.WriteLine($"Creating MultiChain: {blockchainName}");
var dataDir = MultiChainTools.GetAppDataFolder();
var process = new Process
{
StartInfo =
{
// Stop the process from opening a new window
RedirectStandardOutput = true,
RedirectStandardError = true,
UseShellExecute = false,
CreateNoWindow = true,
// Setup executable and parameters
FileName = multichainUtilPath,
Arguments = $"-datadir={dataDir} create {blockchainName}"
}
};
var outputQueue = new Queue <string>();
var errQueue = new Queue <string>();
process.OutputDataReceived += (sender, args) =>
{
if (string.IsNullOrWhiteSpace(args.Data))
{
return;
}
Debug.WriteLine($"Multichain-util: {args.Data}");
outputQueue.Enqueue(args.Data);
};
process.ErrorDataReceived += (sender, args) =>
{
if (string.IsNullOrWhiteSpace(args.Data))
{
return;
}
Debug.WriteLine($"Multichain-util Error: {args.Data}");
errQueue.Enqueue(args.Data);
};
// Go
var success = process.Start();
if (!success)
{
throw new CouldNotCreateBlockchainException("Could not start process");
}
process.BeginOutputReadLine();
process.BeginErrorReadLine();
// Wait for process to end
await Task.Run(() =>
{
if (process.WaitForExit(10 * 1000))
{
// Allow error events time to be processed
Thread.Sleep(100);
if (errQueue.Count > 0)
{
throw new CouldNotCreateBlockchainException(string.Join("\n", errQueue));
}
}
else
{
// Process hanging
process.Kill();
throw new CouldNotCreateBlockchainException("Process timed out");
}
});
}