private async Task Echo(HttpContext context, IWebSocketConnection webSocket, ILogger logger)
{
var lastFrameOpcode = WebSocketOpcode.Continuation;
var closeResult = await webSocket.ExecuteAsync(frame =>
{
if (frame.Opcode == WebSocketOpcode.Ping || frame.Opcode == WebSocketOpcode.Pong)
{
// Already handled
return(Task.CompletedTask);
}
LogFrame(logger, lastFrameOpcode, ref frame);
// If the client send "ServerClose", then they want a server-originated close to occur
string content = "<<binary>>";
if (frame.Opcode == WebSocketOpcode.Text)
{
// Slooooow
content = Encoding.UTF8.GetString(frame.Payload.ToArray());
if (content.Equals("ServerClose"))
{
logger.LogDebug($"Sending Frame Close: {WebSocketCloseStatus.NormalClosure} Closing from Server");
return(webSocket.CloseAsync(new WebSocketCloseResult(WebSocketCloseStatus.NormalClosure, "Closing from Server")));
}
else if (content.Equals("ServerAbort"))
{
context.Abort();
}
}
if (frame.Opcode != WebSocketOpcode.Continuation)
{
lastFrameOpcode = frame.Opcode;
}
logger.LogDebug($"Sending {frame.Opcode}: Len={frame.Payload.Length}, Fin={frame.EndOfMessage}: {content}");
return(webSocket.SendAsync(frame));
});
if (webSocket.State == WebSocketConnectionState.CloseReceived)
{
// Close the connection from our end
await webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure);
logger.LogDebug("Socket closed");
}
else if (webSocket.State != WebSocketConnectionState.Closed)
{
logger.LogError("WebSocket closed but not closed?");
}
}
/// <summary> /// Sends a Close frame to the other party. This does not guarantee that the client will send a responding close frame. /// </summary> /// <param name="result">A <see cref="WebSocketCloseResult"/> with the payload for the close frame.</param> /// <returns>A <see cref="Task"/> that completes when the close frame has been sent</returns> public static Task CloseAsync(this IWebSocketConnection self, WebSocketCloseResult result) => self.CloseAsync(result, CancellationToken.None);
/// <summary> /// Sends a Close frame to the other party. This does not guarantee that the client will send a responding close frame. /// </summary> /// <param name="status">A <see cref="WebSocketCloseStatus"/> value to be sent to the client in the close frame</param>. /// <param name="description">A textual description of the reason for closing the connection.</param> /// <returns>A <see cref="Task"/> that completes when the close frame has been sent</returns> public static Task CloseAsync(this IWebSocketConnection self, WebSocketCloseStatus status, string description) => self.CloseAsync(new WebSocketCloseResult(status, description), CancellationToken.None);
/// <summary> /// Sends a Close frame to the other party. This does not guarantee that the client will send a responding close frame. /// </summary> /// <param name="status">A <see cref="WebSocketCloseStatus"/> value to be sent to the client in the close frame</param>. /// <param name="cancellationToken">A <see cref="CancellationToken"/> that indicates when/if the send is cancelled.</param> /// <returns>A <see cref="Task"/> that completes when the close frame has been sent</returns> public static Task CloseAsync(this IWebSocketConnection self, WebSocketCloseStatus status, CancellationToken cancellationToken) => self.CloseAsync(new WebSocketCloseResult(status), cancellationToken);