57 lines
2.0 KiB
C#
57 lines
2.0 KiB
C#
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using CoreFoundation;
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using Network;
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using VoiceCat.Core;
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namespace VoiceCat.iOS;
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// Watches which interface actually carries traffic so a handover can be acted on the instant it
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// happens instead of after the control keepalive proves the old path dead.
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//
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// The signal must be narrow. Roaming between access points, a lift ride, a minute of bad
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// cellular: those keep the same interface and the same source address, so TCP survives them and
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// a reconnect would be pure damage. Only the set of satisfied interfaces changing — Wi-Fi to
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// cellular, one physical link to another — strands the existing sockets on a source address that
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// no longer exists, and that is the only thing reported here.
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internal sealed class IosNetworkPathMonitor : IDisposable
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{
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internal static IosNetworkPathMonitor Shared { get; } = new();
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private readonly DispatchQueue queue = new("voicecat.path");
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private readonly object gate = new();
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private readonly ControlPathWatcher watcher = new();
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private NWPathMonitor? monitor;
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private bool started;
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// Raised on the monitor queue when the carrying interface changed and the new path is usable.
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internal event Action<string>? InterfaceChanged;
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internal void Start()
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{
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lock (gate)
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{
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if (started) return;
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started = true;
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monitor = new NWPathMonitor();
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monitor.SetQueue(queue);
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monitor.SnapshotHandler = OnPath;
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monitor.Start();
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}
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}
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private void OnPath(NWPath path)
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{
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List<string> interfaces = [];
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if (path.Status == NWPathStatus.Satisfied)
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path.EnumerateInterfaces(item => { interfaces.Add($"{item.InterfaceType}:{item.Name}"); return true; });
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if (watcher.Observe(path.Status == NWPathStatus.Satisfied, interfaces))
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InterfaceChanged?.Invoke(string.Join(",", interfaces));
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}
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public void Dispose()
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{
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lock (gate)
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{
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monitor?.Cancel(); monitor?.Dispose(); monitor = null; started = false; watcher.Reset();
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}
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}
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}
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