57 lines
1.4 KiB
C#
57 lines
1.4 KiB
C#
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using System;
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using System.Globalization;
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using System.Net;
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using Cysharp.Threading.Tasks;
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using UniRx;
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public class NetTime : LazySingleton<NetTime>
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{
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public readonly ReactiveProperty<bool> IsAvailable = new ReactiveProperty<bool>();
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public IObservable<bool> IsAvailableAsObservable() => IsAvailable;
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public DateTime Time => DateTime.Now + _timeDelta;
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private TimeSpan _timeDelta = TimeSpan.Zero;
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private static async UniTask<DateTime> GetTimeAsync()
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{
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using (var response =
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await WebRequest.Create("https://www.google.com").GetResponseAsync())
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return DateTime.ParseExact(response.Headers["date"],
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"ddd, dd MMM yyyy HH:mm:ss 'GMT'",
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CultureInfo.InvariantCulture.DateTimeFormat,
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DateTimeStyles.AssumeUniversal);
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}
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private void Awake()
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{
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UniTask.Run(CacheTimeAsync);
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}
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private void OnApplicationFocus(bool hasFocus)
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{
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if (hasFocus == false)
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{
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IsAvailable.Value = false;
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return;
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}
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UniTask.Run(CacheTimeAsync);
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}
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private async void CacheTimeAsync()
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{
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try
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{
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var googleTime = await GetTimeAsync();
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var deviceTime = DateTime.Now;
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_timeDelta = googleTime - deviceTime;
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IsAvailable.Value = true;
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}
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catch (Exception)
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{
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Log.Error("Can't connect with google.");
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}
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}
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}
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