127 lines
4.7 KiB
C#
127 lines
4.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Threading.Tasks;
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using System.Net.WebSockets;
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using LeanCloud.Realtime.Protocol;
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using LeanCloud.Storage;
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using LeanCloud.Realtime.Internal.Router;
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using LeanCloud.Common;
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using Google.Protobuf;
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namespace LeanCloud.Realtime.Internal.WebSocket {
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internal class LCWebSocketConnection {
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private const int KEEP_ALIVE_INTERVAL = 10;
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private const int RECV_BUFFER_SIZE = 1024;
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private ClientWebSocket ws;
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private volatile int requestI = 1;
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private readonly object requestILock = new object();
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private Dictionary<int, TaskCompletionSource<GenericCommand>> responses;
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internal Action<GenericCommand> OnNotification {
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get; set;
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}
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internal LCWebSocketConnection() {
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responses = new Dictionary<int, TaskCompletionSource<GenericCommand>>();
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}
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internal async Task Connect() {
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LCRTMRouter rtmRouter = new LCRTMRouter();
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string rtmServer = await rtmRouter.GetServer();
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ws = new ClientWebSocket();
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ws.Options.AddSubProtocol("lc.protobuf2.3");
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ws.Options.KeepAliveInterval = TimeSpan.FromSeconds(KEEP_ALIVE_INTERVAL);
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await ws.ConnectAsync(new Uri(rtmServer), default);
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_ = StartReceive();
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}
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internal Task<GenericCommand> SendRequest(GenericCommand request) {
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TaskCompletionSource<GenericCommand> tcs = new TaskCompletionSource<GenericCommand>();
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request.I = RequestI;
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responses.Add(request.I, tcs);
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LCLogger.Debug($"=> {request.Cmd}/{request.Op}: {request.ToString()}");
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ArraySegment<byte> bytes = new ArraySegment<byte>(request.ToByteArray());
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try {
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ws.SendAsync(bytes, WebSocketMessageType.Binary, true, default);
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} catch (Exception e) {
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// TODO 发送消息异常
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}
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return tcs.Task;
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}
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internal async Task Close() {
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await ws.CloseAsync(WebSocketCloseStatus.NormalClosure, "1", default);
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}
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private async Task StartReceive() {
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byte[] buffer = new byte[RECV_BUFFER_SIZE];
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try {
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while (ws.State == WebSocketState.Open) {
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byte[] data = new byte[0];
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WebSocketReceiveResult result;
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do {
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result = await ws.ReceiveAsync(new ArraySegment<byte>(buffer), default);
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if (result.MessageType == WebSocketMessageType.Close) {
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// TODO 区分主动断开和被动断开
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return;
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}
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// 拼合 WebSocket Frame
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byte[] oldData = data;
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data = new byte[data.Length + result.Count];
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Array.Copy(oldData, data, oldData.Length);
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Array.Copy(buffer, 0, data, oldData.Length, result.Count);
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} while (!result.EndOfMessage);
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try {
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GenericCommand command = GenericCommand.Parser.ParseFrom(data);
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LCLogger.Debug($"<= {command.Cmd}/{command.Op}: {command.ToString()}");
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HandleCommand(command);
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} catch (Exception e) {
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// 解析消息错误
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LCLogger.Error(e.Message);
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}
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}
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} catch (Exception e) {
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// TODO 连接断开
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LCLogger.Error(e.Message);
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}
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}
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private void HandleCommand(GenericCommand command) {
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if (command.HasI) {
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// 应答
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if (responses.TryGetValue(command.I, out TaskCompletionSource<GenericCommand> tcs)) {
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if (command.HasErrorMessage) {
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// 错误
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ErrorCommand error = command.ErrorMessage;
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int code = error.Code;
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string detail = error.Detail;
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// TODO 包装成异常抛出
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LCException exception = new LCException(code, detail);
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tcs.SetException(exception);
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} else {
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tcs.SetResult(command);
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}
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}
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} else {
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// 通知
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OnNotification?.Invoke(command);
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}
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}
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private int RequestI {
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get {
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lock (requestILock) {
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return requestI++;
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};
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}
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}
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}
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}
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