public async Task<CommandResult> SendCmd(string command, object arg)
{
int cid = Interlocked.Increment(ref _cmdId);
Command cmd = new Command()
{
Id = cid,
Name = command
};
cmd.Parameters = Newtonsoft.Json.Linq.JToken.FromObject(arg);
Stopwatch sw = new Stopwatch();
TaskCompletionSource<CommandResult> tks = new TaskCompletionSource<CommandResult>();
_cmdData.Add(cid, tks);
sw.Start();
base.SendCommand(cmd);
if (await Task.WhenAny(tks.Task, Task.Delay(_timeout)) != tks.Task)
{
throw new Exception("Timeout");
}
CommandResult rv = await tks.Task;
sw.Stop();
_cmdData.Remove(cid);
rv.ExecutionTime = sw.ElapsedMilliseconds;
return rv;
}
/// <summary>
/// Send custom DeviceHive command to the device
/// </summary>
protected void SendCommand(Command command)
{
if (_commandMapping == null) // device isn't registered yet
throw new InvalidOperationException("Device received command but devices isn't registered yet");
CommandMetadata commandMetadata;
if (!_commandMapping.TryGetValue(command.Name, out commandMetadata))
throw new InvalidOperationException(string.Format("Command {0} is not registered", command.Name));
byte[] data;
using (var stream = new MemoryStream())
using (var writer = new BinaryWriter(stream))
{
writer.Write(command.Id.Value);
WriteParameterValue(writer, commandMetadata.Parameters, command.Parameters);
data = stream.ToArray();
}
SendMessage(commandMetadata.Intent, data);
}
private void SendCommandResult(DeviceBase device, Command cCommand)
{
Logger.InfoFormat("Sending command '{0}' status '{1}' from device {2} ({3})",
cCommand.Name, cCommand.Status, device.ID, device.Name);
try
{
DeviceClient.UpdateCommand(device.ID, device.Key, cCommand);
}
catch (Exception ex)
{
// not critical - do nothing
Logger.Error(string.Format("Exception while sending command '{0}' status '{1}' from device {2} ({3})",
cCommand.Name, cCommand.Status, device.ID, device.Name), ex);
}
}
private void DispatchCommandTask(DeviceBase device, Command cCommand)
{
// invoke device
DeviceCommandResult result;
try
{
var command = new DeviceCommand(cCommand.Name.Trim(),
cCommand.Parameters == null ? null : cCommand.Parameters.DeepClone(),
cCommand.UserId);
result = device.HandleCommand(command, _cancellationSource.Token);
}
catch (OperationCanceledException)
{
return;
}
catch (Exception ex)
{
// operation faulted - log the error and send failed result
Logger.Error(string.Format("Exception while handling a command '{0}' by device {1} ({2})", cCommand.Name, device.ID, device.Name), ex);
result = new DeviceCommandResult("Failed", "An error occurred while handling the command");
}
// send command result
cCommand.Status = result.Status;
cCommand.Result = result.Result == null ? null : JToken.FromObject(result.Result, device.JsonSerializer);
SendCommandResult(device, cCommand);
}
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="deviceGuid">Device unique identifier.</param>
/// <param name="command">Command object.</param>
public CommandEventArgs(string deviceGuid, Command command)
{
DeviceGuid = deviceGuid;
Command = command;
}
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="command">Command object</param>
public CommandEventArgs(Guid deviceGuid, Command command)
{
_command = command;
_deviceGuid = deviceGuid;
}
