jellyfin/Emby.Dlna/Ssdp/DeviceDiscovery.cs

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using System;
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using System.Collections.Generic;
using System.Linq;
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using MediaBrowser.Controller.Configuration;
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using MediaBrowser.Model.Dlna;
using MediaBrowser.Model.Events;
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using MediaBrowser.Model.Net;
using MediaBrowser.Model.Threading;
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using Microsoft.Extensions.Logging;
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using Rssdp;
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using Rssdp.Infrastructure;
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namespace Emby.Dlna.Ssdp
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{
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public class DeviceDiscovery : IDeviceDiscovery
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{
private bool _disposed;
private readonly ILogger _logger;
private readonly IServerConfigurationManager _config;
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private event EventHandler<GenericEventArgs<UpnpDeviceInfo>> DeviceDiscoveredInternal;
private int _listenerCount;
private object _syncLock = new object();
public event EventHandler<GenericEventArgs<UpnpDeviceInfo>> DeviceDiscovered
{
add
{
lock (_syncLock)
{
_listenerCount++;
DeviceDiscoveredInternal += value;
}
StartInternal();
}
remove
{
lock (_syncLock)
{
_listenerCount--;
DeviceDiscoveredInternal -= value;
}
}
}
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public event EventHandler<GenericEventArgs<UpnpDeviceInfo>> DeviceLeft;
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private SsdpDeviceLocator _deviceLocator;
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private readonly ITimerFactory _timerFactory;
private readonly ISocketFactory _socketFactory;
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private ISsdpCommunicationsServer _commsServer;
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public DeviceDiscovery(ILogger logger, IServerConfigurationManager config, ISocketFactory socketFactory, ITimerFactory timerFactory)
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{
_logger = logger;
_config = config;
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_socketFactory = socketFactory;
_timerFactory = timerFactory;
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}
// Call this method from somewhere in your code to start the search.
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public void Start(ISsdpCommunicationsServer communicationsServer)
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{
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_commsServer = communicationsServer;
StartInternal();
}
private void StartInternal()
{
lock (_syncLock)
{
if (_listenerCount > 0 && _deviceLocator == null)
{
_deviceLocator = new SsdpDeviceLocator(_commsServer, _timerFactory);
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// (Optional) Set the filter so we only see notifications for devices we care about
// (can be any search target value i.e device type, uuid value etc - any value that appears in the
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// DiscoverdSsdpDevice.NotificationType property or that is used with the searchTarget parameter of the Search method).
//_DeviceLocator.NotificationFilter = "upnp:rootdevice";
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// Connect our event handler so we process devices as they are found
_deviceLocator.DeviceAvailable += deviceLocator_DeviceAvailable;
_deviceLocator.DeviceUnavailable += _DeviceLocator_DeviceUnavailable;
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var dueTime = TimeSpan.FromSeconds(5);
var interval = TimeSpan.FromSeconds(_config.GetDlnaConfiguration().ClientDiscoveryIntervalSeconds);
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_deviceLocator.RestartBroadcastTimer(dueTime, interval);
}
}
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}
// Process each found device in the event handler
void deviceLocator_DeviceAvailable(object sender, DeviceAvailableEventArgs e)
{
var originalHeaders = e.DiscoveredDevice.ResponseHeaders;
var headerDict = originalHeaders == null ? new Dictionary<string, KeyValuePair<string, IEnumerable<string>>>() : originalHeaders.ToDictionary(i => i.Key, StringComparer.OrdinalIgnoreCase);
var headers = headerDict.ToDictionary(i => i.Key, i => i.Value.Value.FirstOrDefault(), StringComparer.OrdinalIgnoreCase);
var args = new GenericEventArgs<UpnpDeviceInfo>
{
Argument = new UpnpDeviceInfo
{
Location = e.DiscoveredDevice.DescriptionLocation,
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Headers = headers,
LocalIpAddress = e.LocalIpAddress
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}
};
DeviceDiscoveredInternal?.Invoke(this, args);
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}
private void _DeviceLocator_DeviceUnavailable(object sender, DeviceUnavailableEventArgs e)
{
var originalHeaders = e.DiscoveredDevice.ResponseHeaders;
var headerDict = originalHeaders == null ? new Dictionary<string, KeyValuePair<string, IEnumerable<string>>>() : originalHeaders.ToDictionary(i => i.Key, StringComparer.OrdinalIgnoreCase);
var headers = headerDict.ToDictionary(i => i.Key, i => i.Value.Value.FirstOrDefault(), StringComparer.OrdinalIgnoreCase);
var args = new GenericEventArgs<UpnpDeviceInfo>
{
Argument = new UpnpDeviceInfo
{
Location = e.DiscoveredDevice.DescriptionLocation,
Headers = headers
}
};
DeviceLeft?.Invoke(this, args);
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}
public void Dispose()
{
if (!_disposed)
{
_disposed = true;
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if (_deviceLocator != null)
{
_deviceLocator.Dispose();
_deviceLocator = null;
}
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}
}
}
}