/// <summary>
/// Read another message from the web socket and print it to the console
/// </summary>
/// <param name="connection">WebSocket connection</param>
/// <param name="cancellationToken">Cancellation token</param>
/// <returns>Asynchronous task</returns>
private static async Task ReadFromWebSocket(HttpEndpointConnection connection, CancellationToken cancellationToken)
{
// Note that no content has been received when we get here for the first time.
// In this case, it may take a while before/if data can be received from the client
do
{
ReceivedHttpRequest websocketRequest = await connection.ReadRequest(cancellationToken);
Console.WriteLine(websocketRequest.Body);
}while (!cancellationToken.IsCancellationRequested);
}
/// <summary>
/// Read a message from the console and send it to the client
/// </summary>
/// <param name="connection">WebSocket connection</param>
/// <param name="cancellationToken">Cancellation token</param>
/// <returns>Asynchronous task</returns>
private static async Task ReadFromConsole(HttpEndpointConnection connection, CancellationToken cancellationToken)
{
do
{
string input = await Task.Run(() => Console.ReadLine(), cancellationToken);
if (input == "close")
{
// Sending codes greater than or equal to 1000 closes the connection
await connection.SendResponse(1000, "Connection closed", HttpResponseType.StatusCode, cancellationToken);
}
else
{
// Send input to the client
await connection.SendResponse(200, input, HttpResponseType.PlainText, cancellationToken);
}
}while (!cancellationToken.IsCancellationRequested);
}
/// <summary>
/// Called when a new HTTP or WebSocket request has been received
/// </summary>
/// <param name="unixSocket">UNIX socket for HTTP endpoints</param>
/// <param name="requestConnection">Connection from the UNIX socket representing the HTTP or WebSocket request</param>
private static async void OnHttpRequestReceived(HttpEndpointUnixSocket unixSocket, HttpEndpointConnection requestConnection)
{
// Note that a call to ReadRequest can throw an exception in case DCS only created a test connection!
// DCS may do that when an application attempts to register an existing endpoint twice
if (_method == HttpEndpointType.WebSocket)
{
if (_websocketConnected)
{
await requestConnection.SendResponse(1000, "Demo application only supports one WebSocket connection");
return;
}
_websocketConnected = true;
if (!_quiet)
{
Console.WriteLine("WebSocket connected, type 'close' to close this connection");
}
try
{
using CancellationTokenSource cts = new CancellationTokenSource();
Task webSocketTask = ReadFromWebSocket(requestConnection, cts.Token);
Task consoleTask = ReadFromConsole(requestConnection, cts.Token);
await Task.WhenAny(webSocketTask, consoleTask);
cts.Cancel();
}
catch (Exception e)
{
if (!(e is OperationCanceledException) && !(e is SocketException))
{
Console.WriteLine("Unexpected error:");
Console.WriteLine(e);
}
}
finally
{
_websocketConnected = false;
if (!_quiet)
{
Console.WriteLine("WebSocket disconnected");
}
}
}
else
{
// Read the HTTP response from the client
ReceivedHttpRequest request = await requestConnection.ReadRequest();
if (string.IsNullOrWhiteSpace(_cmd))
{
// Write this event to the console if possible
if (!_quiet)
{
Console.WriteLine("Got new HTTP request from session {0}", request.SessionId);
}
// Only print a demo response in case no process is supposed to be started
string response = $"This demo text has been returned from a third-party application.\n\nMethod: {_method}\nSession ID: {request.SessionId}";
if (request.Headers.Count > 0)
{
response += "\n\nHeaders:";
foreach (var kv in request.Headers)
{
response += $"\n{kv.Key} = {kv.Value}";
}
}
if (request.Queries.Count > 0)
{
response += "\n\nQueries:";
foreach (var kv in request.Queries)
{
response += $"\n{kv.Key} = {kv.Value}";
}
}
if (!string.IsNullOrWhiteSpace(request.Body))
{
response += "\n\nBody:\n" + request.Body;
}
await requestConnection.SendResponse(200, response, HttpResponseType.PlainText);
}
else
{
// Replace query values in the arguments
string args = _cmd;
foreach (var kv in request.Queries)
{
args.Replace($"%{kv.Key}%", kv.Value);
}
// Prepare the process start info
using Process process = new Process
{
StartInfo = new ProcessStartInfo
{
FileName = _cmd,
Arguments = args,
RedirectStandardOutput = true
}
};
// Start a process and wait for it to exit
string output = "";
process.OutputDataReceived += (object sender, DataReceivedEventArgs e) => output += e.Data;
process.ErrorDataReceived += (object sender, DataReceivedEventArgs e) => output += e.Data;
if (process.Start())
{
process.BeginOutputReadLine();
process.BeginErrorReadLine();
process.WaitForExit();
await requestConnection.SendResponse(200, output, HttpResponseType.PlainText);
}
else
{
await requestConnection.SendResponse(501, "Failed to start process", HttpResponseType.StatusCode);
}
}
}
}
