128 lines
4.1 KiB
C#
128 lines
4.1 KiB
C#
using System;
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using System.Threading.Tasks;
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using LeanCloud.Realtime.Protocol;
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namespace LeanCloud.Realtime.Internal.Controller {
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internal class LCIMSessionController : LCIMController {
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private string token;
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private DateTimeOffset expiredAt;
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internal LCIMSessionController(LCIMClient client)
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: base(client) {
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}
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#region 内部接口
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/// <summary>
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/// 打开会话
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/// </summary>
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/// <returns></returns>
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internal async Task Open(bool reconnect) {
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SessionCommand session = NewSessionCommand();
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session.R = reconnect;
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GenericCommand request = NewCommand(CommandType.Session, OpType.Open);
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request.SessionMessage = session;
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GenericCommand response = await Client.Connection.SendRequest(request);
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UpdateSession(response.SessionMessage);
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}
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/// <summary>
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/// 重新打开会话，重连时调用
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/// </summary>
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/// <returns></returns>
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internal async Task Reopen() {
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SessionCommand session = NewSessionCommand();
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session.R = true;
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GenericCommand request = NewCommand(CommandType.Session, OpType.Open);
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request.SessionMessage = session;
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GenericCommand response = await Client.Connection.SendRequest(request);
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UpdateSession(response.SessionMessage);
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}
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/// <summary>
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/// 关闭会话
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/// </summary>
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/// <returns></returns>
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internal async Task Close() {
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GenericCommand request = NewCommand(CommandType.Session, OpType.Close);
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await Client.Connection.SendRequest(request);
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}
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/// <summary>
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/// 获取可用 token
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/// </summary>
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/// <returns></returns>
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internal async Task<string> GetToken() {
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if (IsExpired) {
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await Refresh();
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}
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return token;
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}
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#endregion
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private async Task Refresh() {
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SessionCommand session = NewSessionCommand();
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GenericCommand request = NewCommand(CommandType.Session, OpType.Refresh);
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request.SessionMessage = session;
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GenericCommand response = await Client.Connection.SendRequest(request);
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UpdateSession(response.SessionMessage);
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}
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private SessionCommand NewSessionCommand() {
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SessionCommand session = new SessionCommand();
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if (Client.Tag != null) {
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session.Tag = Client.Tag;
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session.DeviceId = Guid.NewGuid().ToString();
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}
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if (Client.SignatureFactory != null) {
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LCIMSignature signature = Client.SignatureFactory.CreateConnectSignature(Client.Id);
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session.S = signature.Signature;
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session.T = signature.Timestamp;
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session.N = signature.Nonce;
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}
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return session;
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}
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private void UpdateSession(SessionCommand session) {
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token = session.St;
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int ttl = session.StTtl;
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expiredAt = DateTimeOffset.Now + TimeSpan.FromSeconds(ttl);
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}
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private bool IsExpired {
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get {
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return DateTimeOffset.Now > expiredAt;
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}
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}
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#region 消息处理
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internal override async Task OnNotification(GenericCommand notification) {
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switch (notification.Op) {
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case OpType.Closed:
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await OnClosed(notification.SessionMessage);
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break;
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default:
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break;
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}
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}
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/// <summary>
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/// 被关闭
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/// </summary>
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/// <param name="session"></param>
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/// <returns></returns>
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private async Task OnClosed(SessionCommand session) {
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int code = session.Code;
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string reason = session.Reason;
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string detail = session.Detail;
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await Connection.Close();
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Client.OnClose?.Invoke(code, reason, detail);
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}
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#endregion
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}
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}
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