/// <summary>
///
/// </summary>
/// <param name="_request"></param>
private void ActionForRequest(object _request)
{
Messages.Request request = _request as Messages.Request;
if (request.Delay > 0)
{
Thread.Sleep(request.Delay);
}
Messages.Response response = ProcessRequest(request);
responseQueue.Enqueue(response);
}
/// <summary>
/// Write response to stdout using native message protocol, message lentgh first int32 and then data
/// Firefox and Chrome use the same protocol
/// @see Firefox https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Native_messaging#Exchanging_messages
/// @see Chrome https://developer.chrome.com/apps/nativeMessaging#native-messaging-host-protocol
/// </summary>
/// <param name="response"></param>
private void WriteMessage(Messages.Response response)
{
string data = JsonConvert.SerializeObject(response, Formatting.None);
var bytes = System.Text.Encoding.UTF8.GetBytes(data);
Log.Debug("Sending Message: {0}", data);
using var stdout = Console.OpenStandardOutput();
stdout.WriteByte((byte)((bytes.Length >> 0) & 0xFF));
stdout.WriteByte((byte)((bytes.Length >> 8) & 0xFF));
stdout.WriteByte((byte)((bytes.Length >> 16) & 0xFF));
stdout.WriteByte((byte)((bytes.Length >> 24) & 0xFF));
stdout.Write(bytes, 0, bytes.Length);
stdout.Flush();
}
/// <summary>
/// Sends a message to the browser, note that the message might not be able to reach if the stdIn / stdOut
/// aren't properly configured (i.e. Process needs to be started)
/// </summary>
/// <param name="response"></param>
private void SendMessage(Messages.Response response)
{
if (state == EndpointState.Listening)
{
writeMessageMutex.WaitOne();
try {
if (TestMode)
{
WriteDebugMessage(response);
}
else
{
WriteMessage(response);
}
} catch (Exception e) {
Log.Information("{0} during SendMessage : {1}", e.GetType(), e.Message);
} finally {
writeMessageMutex.ReleaseMutex();
}
}
}
/// <summary>
///
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
private Messages.Response ProcessRequest(Messages.Request request)
{
Messages.Response response = null;
if (Handlers.ContainsKey(request.Name))
{
Log.Debug("Route request to {0} ", request.Name);
try {
Handlers.TryGetValue(request.Name, out Handler handler);
response = handler.Invoke(request);
} catch (Exception e) {
response = request.Failure(e.GetType().Name, e.Message);
}
}
else
{
Log.Debug("No handler defined for {0}", request.Name);
response = request.Unknown(String.Format("Unknown request {0}", request.Name));
}
return(response);
}
/// <summary>
/// Handles a request. if that request is async, enqueues in the request queue for later treatment
/// otherwise process the request immediatly
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
private void HandleRequest(Messages.Request request)
{
if (request == null)
{
Log.Debug("No route : Empty Request body");
throw new BadNativeMessagingProtocol("D'oh! Invalid request format : Empty request body");
}
if (request.Async)
{
Log.Debug("Async-Request received: {0}", request.ToString());
requestQueue.Enqueue(request);
}
else
{
Log.Debug("Sync-Request received: {0}", request.ToString());
processRequestMutex.WaitOne();
Messages.Response response = ProcessRequest(request);
SendMessage(response);
processRequestMutex.ReleaseMutex();
}
}
/// <summary>
/// Write response on stdout by serializing response using json format.
/// Used to debugging purpose.
/// </summary>
/// <param name="data"></param>
private void WriteDebugMessage(Messages.Response response)
{
Log.Debug("Sending debug message: {0}", response.ToString());
using var stdout = Console.OpenStandardOutput();
stdout.Write(System.Text.Encoding.UTF8.GetBytes(response.ToString()));
}