C# 使用OWIN的WebSocket
到目前为止,我看到的所有通过web api使用Microsoft websocket的示例都使用IIS,实现在get方法上。HTTP连接被升级到websocket,websocket处理程序的实例被传递到HTTPContextC# 使用OWIN的WebSocket,c#,asp.net-web-api,websocket,owin,C#,Asp.net Web Api,Websocket,Owin,到目前为止,我看到的所有通过web api使用Microsoft websocket的示例都使用IIS,实现在get方法上。HTTP连接被升级到websocket,websocket处理程序的实例被传递到HTTPContext public HttpResponseMessage Get() { if (HttpContext.Current.IsWebSocketRequest) { var noteHandler = new NoteSocketHandler();
public HttpResponseMessage Get() {
if (HttpContext.Current.IsWebSocketRequest) {
var noteHandler = new NoteSocketHandler();
HttpContext.Current.AcceptWebSocketRequest(noteHandler);
}
return new HttpResponseMessage(HttpStatusCode.SwitchingProtocols);
}
我试图实现的是在OWIN管道上做同样的事情。我面临的问题是连接正在升级为使用websocket,但它没有使用我的websocket处理程序。我哪里做错了?请建议
控制器利用文本(遵循示例)
public HttpResponseMessage Get(){
IOwinContext owinContext=Request.GetOwinContext();
WebSocketAccept-acceptToken=owinContext.Get(“websocket.Accept”);
if(acceptToken!=null){
var requestHeaders=GetValue(owinContext.Environment,“owin.requestHeaders”);
Dictionary acceptOptions=null;
字符串[]子目录;
if(requestHeaders.TryGetValue(“Sec WebSocket协议”,out子目录)&&subtocols.Length>0){
acceptOptions=newdictionary();
//从客户端选择第一个
acceptOptions.Add(“websocket.subtocol”,subtocols[0]。拆分(',).First().Trim());
}
acceptToken(acceptOptions,异步wsEnv=>{
var wssendsync=(websocketsendsync)wsEnv[“websocket.sendsync”];
var wsreceiveasync=(WebSocketReceiveAsync)wsEnv[“websocket.ReceiveAsync”];
var wsCloseAsync=(WebSocketCloseAsync)wsEnv[“websocket.CloseAsync”];
var wsCallCancelled=(CancellationToken)wsEnv[“websocket.CallCancelled”];
//我应该将处理程序传递给事件吗?
var handler=new NoteSocketHAndler();
});
}否则{
返回新的HttpResponseMessage(HttpStatusCode.BadRequest);
}
返回新的HttpResponseMessage(HttpStatusCode.SwitchingProtocols);
}
处理程序代码:
using System;
using Socket = Microsoft.Web.WebSockets;
using Newtonsoft.Json;
public class NoteSocketHandler : Socket.WebSocketHandler {
private static Socket.WebSocketCollection connections = new Socket.WebSocketCollection();
public NoteSocketHandler() {
}
public override void OnOpen() {
connections.Add(this);
}
public override void OnClose() {
connections.Remove(this);
}
public override void OnMessage(string message) {
ChatMessage chatMessage = JsonConvert.DeserializeObject<ChatMessage>(message);
foreach (var connection in connections) {
connection.Send(message);
}
}
}
使用系统;
使用Socket=Microsoft.Web.WebSockets;
使用Newtonsoft.Json;
公共类NoteSocketHandler:Socket.WebSocketHandler{
private static Socket.WebSocketCollection connections=new Socket.WebSocketCollection();
公共记事本{
}
公共覆盖无效OnOpen(){
连接。添加(此);
}
公共覆盖void OnClose(){
连接。移除(此);
}
公共覆盖无效消息(字符串消息){
ChatMessage ChatMessage=JsonConvert.DeserializeObject(消息);
foreach(连接中的var连接){
连接。发送(消息);
}
}
}
我终于想出了解决问题的办法。你可以找到下面的代码,我也写了一个基本的应用程序,使用
使用System.Collections.Generic;
使用System.Linq;
Net系统;
使用System.Net.Http;
使用System.Web.Http;
使用Microsoft.Owin;
命名空间NoteApp.WebService.Controller{
使用制度;
使用System.Net.WebSockets;
使用系统文本;
使用系统线程;
使用System.Threading.Tasks;
使用NoteApp.WebService.Handler;
使用WebSocketAccept=System.Action<
System.Collections.Generic.IDictionary,//WebSocket接受参数
System.Func>;
使用WebSocketCloseAsync=System.Func<
int,//关闭状态
字符串,//closeDescription
System.Threading.CancellationToken,//取消
System.Threading.Tasks.Task>;
使用WebSocketReceiveAsync=System.Func<
System.ArraySegment,//数据
System.Threading.CancellationToken,//取消
System.Threading.Tasks.Task<
System.Tuple/WebSocketReceiveTuple
int,//messageType
bool,//endOfMessage
int>>>;//计数
//关闭状态描述
使用WebSocketReceiveResult=System.Tuple;
使用WebSocketSendAsync=System.Func<
System.ArraySegment,//数据
int,//消息类型
bool,//消息结束
System.Threading.CancellationToken,//取消
System.Threading.Tasks.Task>;
公共类NoteController:ApicController{
公共HttpResponseMessage Get(){
IOwinContext owinContext=Request.GetOwinContext();
WebSocketAccept-acceptToken=owinContext.Get(“websocket.Accept”);
if(acceptToken!=null){
var requestHeaders=GetValue(owinContext.Environment,“owin.requestHeaders”);
Dictionary acceptOptions=null;
字符串[]子目录;
if(requestHeaders.TryGetValue(“Sec WebSocket协议”,out子目录)&&subtocols.Length>0){
acceptOptions=newdictionary();
//从客户端选择第一个
acceptOptions.Add(“websocket.subtocol”,subtocols[0]。拆分(',).First().Trim());
}
acceptToken(acceptOptions,ProcessSocketConnection);
}否则{
返回新的HttpResponseMessage(HttpStatusCode.BadRequest);
}
返回新的HttpResponseMessage(HttpStatusCode.SwitchingProtocols);
}
专用异步任务ProcessSocketConnection(IDictionary wsEnv){
var wssendsync=(websocketsendsync)wsEnv[“websocket.sendsync”];
var wsCloseAsync=(WebSocketCloseAsync)wsEnv[“websocket.CloseAsync”];
var wsCallCancelled=(CancellationToken)wsEnv[“websocket.CallCancelled”];
var wsreceiveAsync=(WebSocketReceiveAsync)wsEnv[“WebSock
using System;
using Socket = Microsoft.Web.WebSockets;
using Newtonsoft.Json;
public class NoteSocketHandler : Socket.WebSocketHandler {
private static Socket.WebSocketCollection connections = new Socket.WebSocketCollection();
public NoteSocketHandler() {
}
public override void OnOpen() {
connections.Add(this);
}
public override void OnClose() {
connections.Remove(this);
}
public override void OnMessage(string message) {
ChatMessage chatMessage = JsonConvert.DeserializeObject<ChatMessage>(message);
foreach (var connection in connections) {
connection.Send(message);
}
}
}
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using Microsoft.Owin;
namespace NoteApp.WebService.Controller {
using System;
using System.Net.WebSockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using NoteApp.WebService.Handler;
using WebSocketAccept = System.Action<
System.Collections.Generic.IDictionary<string, object>, // WebSocket Accept parameters
System.Func< // WebSocketFunc callback
System.Collections.Generic.IDictionary<string, object>, // WebSocket environment
System.Threading.Tasks.Task>>;
using WebSocketCloseAsync = System.Func<
int, // closeStatus
string, // closeDescription
System.Threading.CancellationToken, // cancel
System.Threading.Tasks.Task>;
using WebSocketReceiveAsync = System.Func<
System.ArraySegment<byte>, // data
System.Threading.CancellationToken, // cancel
System.Threading.Tasks.Task<
System.Tuple< // WebSocketReceiveTuple
int, // messageType
bool, // endOfMessage
int>>>; // count
// closeStatusDescription
using WebSocketReceiveResult = System.Tuple<int, bool, int>;
using WebSocketSendAsync = System.Func<
System.ArraySegment<byte>, // data
int, // message type
bool, // end of message
System.Threading.CancellationToken, // cancel
System.Threading.Tasks.Task>;
public class NoteController : ApiController {
public HttpResponseMessage Get() {
IOwinContext owinContext = Request.GetOwinContext();
WebSocketAccept acceptToken = owinContext.Get<WebSocketAccept>("websocket.Accept");
if (acceptToken != null) {
var requestHeaders = GetValue<IDictionary<string, string[]>>(owinContext.Environment, "owin.RequestHeaders");
Dictionary<string, object> acceptOptions = null;
string[] subProtocols;
if (requestHeaders.TryGetValue("Sec-WebSocket-Protocol", out subProtocols) && subProtocols.Length > 0) {
acceptOptions = new Dictionary<string, object>();
// Select the first one from the client
acceptOptions.Add("websocket.SubProtocol", subProtocols[0].Split(',').First().Trim());
}
acceptToken(acceptOptions, ProcessSocketConnection);
} else {
return new HttpResponseMessage(HttpStatusCode.BadRequest);
}
return new HttpResponseMessage(HttpStatusCode.SwitchingProtocols);
}
private async Task ProcessSocketConnection(IDictionary<string, object> wsEnv) {
var wsSendAsync = (WebSocketSendAsync)wsEnv["websocket.SendAsync"];
var wsCloseAsync = (WebSocketCloseAsync)wsEnv["websocket.CloseAsync"];
var wsCallCancelled = (CancellationToken)wsEnv["websocket.CallCancelled"];
var wsRecieveAsync = (WebSocketReceiveAsync)wsEnv["websocket.ReceiveAsync"];
//pass the sendasync tuple and the cancellation token to the handler. The handler uses the sendasync method to send message. Each connected client has access to this
var handler = new NoteSocketHandler(wsSendAsync, CancellationToken.None);
handler.OnOpen();
var buffer = new ArraySegment<byte>(new byte[100]);
try {
object status;
while (!wsEnv.TryGetValue("websocket.ClientCloseStatus", out status) || (int)status == 0) {
WebSocketReceiveResult webSocketResultTuple = await wsRecieveAsync(buffer, CancellationToken.None);
int count = webSocketResultTuple.Item3;
handler.OnMessage(Encoding.UTF8.GetString(buffer.Array, 0, count));
}
} catch (Exception ex) {
Console.WriteLine(ex.Message);
throw ex;
}
handler.OnClose();
await wsCloseAsync((int)WebSocketCloseStatus.NormalClosure, "Closing", CancellationToken.None);
}
T GetValue<T>(IDictionary<string, object> env, string key) {
object value;
return env.TryGetValue(key, out value) && value is T ? (T)value : default(T);
}
}
}