private List <string> ValidateNode(ServerNode serverNode)
{
var validationErrors = new List <string>();
if (serverNode == null)
{
validationErrors.Add("The node can not be null!");
return(validationErrors);
}
if (serverNode.Id == null)
{
validationErrors.Add("The node's id can not be null!");
}
if (serverNode.HttpAddress == null)
{
validationErrors.Add("The node's HTTP address cannot be null!");
}
if (serverNode.Id != null && ServerNodes.ContainsKey(serverNode.Id))
{
validationErrors.Add($"The node's id already exists id: {serverNode.Id}!");
}
return(validationErrors);
}
private void CreateNodeConnection(ServerNode serverNode)
{
_backgroundQueue.Enqueue(async token =>
{
var url = $"{serverNode.HttpAddress}/consensusHub";
serverNode.HubConnection = new HubConnectionBuilder().WithUrl(url).Build();
// Reconnect when connection is closing
serverNode.HubConnection.Closed += async error =>
{
await Task.Delay(new Random().Next(0, 5) * 1000, token);
await serverNode.HubConnection.StartAsync(token);
};
// Register action: acceptance of external block
const string methodName = nameof(IConsensusClient.ReceiveBlock);
serverNode.HubConnection.On <EncodedBlock>(methodName, AcceptExternalBlock);
// Start the connection
await serverNode.HubConnection.StartAsync(token);
// Sets the connection status
serverNode.IsConnected = true;
});
}
public BaseResponse <ServerNode> ConnectNode(ServerNode serverNode)
{
var validationErrors = ValidateNode(serverNode);
if (validationErrors.Any())
{
return(new ErrorResponse <ServerNode>("Invalid input node", serverNode, validationErrors.ToArray()));
}
serverNode.IsConnected = null;
CreateNodeConnection(serverNode);
if (!_serverNodesStorage.ServerNodes.TryAdd(serverNode.Id, serverNode))
{
return(new ErrorResponse <ServerNode>($"Could not add a node with id: {serverNode.Id}", serverNode));
}
return(new SuccessResponse <ServerNode>("The node has been added successfully!", serverNode));
}
