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https://github.com/jellyfin/jellyfin.git
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Improve locking logic in SyncPlay manager
This commit is contained in:
Ionut Andrei Oanca
parent
a3ca36cb54
commit
426e258f1f
@ -54,10 +54,15 @@ namespace Emby.Server.Implementations.SyncPlay
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new Dictionary<Guid, IGroupController>();
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/// <summary>
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/// Lock used for accesing any group.
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/// Lock used for accesing the list of groups.
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/// </summary>
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private readonly object _groupsLock = new object();
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/// <summary>
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/// Lock used for accesing the session-to-group map.
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/// </summary>
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private readonly object _mapsLock = new object();
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private bool _disposed = false;
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/// <summary>
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@ -97,7 +102,12 @@ namespace Emby.Server.Implementations.SyncPlay
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return;
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}
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// Locking required to access list of groups.
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lock (_groupsLock)
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{
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// Locking required as session-to-group map will be edited.
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// Locking the group is not required as it is not visible yet.
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lock (_mapsLock)
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{
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if (IsSessionInGroup(session))
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{
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@ -111,6 +121,7 @@ namespace Emby.Server.Implementations.SyncPlay
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group.CreateGroup(session, request, cancellationToken);
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}
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}
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}
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/// <inheritdoc />
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public void JoinGroup(SessionInfo session, Guid groupId, JoinGroupRequest request, CancellationToken cancellationToken)
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@ -123,6 +134,7 @@ namespace Emby.Server.Implementations.SyncPlay
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var user = _userManager.GetUserById(session.UserId);
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// Locking required to access list of groups.
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lock (_groupsLock)
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{
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_groups.TryGetValue(groupId, out IGroupController group);
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@ -136,6 +148,12 @@ namespace Emby.Server.Implementations.SyncPlay
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return;
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}
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// Locking required as session-to-group map will be edited.
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lock (_mapsLock)
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{
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// Group lock required to let other requests end first.
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lock (group)
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{
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if (!group.HasAccessToPlayQueue(user))
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{
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_logger.LogWarning("Session {SessionId} tried to join group {GroupId} but does not have access to some content of the playing queue.", session.Id, group.GroupId.ToString());
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@ -147,7 +165,7 @@ namespace Emby.Server.Implementations.SyncPlay
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if (IsSessionInGroup(session))
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{
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if (GetSessionGroup(session).Equals(groupId))
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if (FindJoinedGroupId(session).Equals(groupId))
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{
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group.SessionRestore(session, request, cancellationToken);
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return;
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@ -160,6 +178,8 @@ namespace Emby.Server.Implementations.SyncPlay
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group.SessionJoin(session, request, cancellationToken);
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}
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}
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}
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}
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/// <inheritdoc />
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public void LeaveGroup(SessionInfo session, CancellationToken cancellationToken)
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@ -170,11 +190,13 @@ namespace Emby.Server.Implementations.SyncPlay
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return;
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}
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// TODO: determine what happens to users that are in a group and get their permissions revoked.
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// Locking required to access list of groups.
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lock (_groupsLock)
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{
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_sessionToGroupMap.TryGetValue(session.Id, out var group);
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// Locking required as session-to-group map will be edited.
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lock (_mapsLock)
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{
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var group = FindJoinedGroup(session);
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if (group == null)
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{
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_logger.LogWarning("Session {SessionId} does not belong to any group.", session.Id);
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@ -184,6 +206,9 @@ namespace Emby.Server.Implementations.SyncPlay
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return;
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}
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// Group lock required to let other requests end first.
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lock (group)
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{
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RemoveSessionFromGroup(session, group);
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group.SessionLeave(session, cancellationToken);
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@ -194,6 +219,8 @@ namespace Emby.Server.Implementations.SyncPlay
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}
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}
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}
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}
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}
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/// <inheritdoc />
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public List<GroupInfoDto> ListGroups(SessionInfo session)
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@ -205,16 +232,26 @@ namespace Emby.Server.Implementations.SyncPlay
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}
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var user = _userManager.GetUserById(session.UserId);
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List<GroupInfoDto> list = new List<GroupInfoDto>();
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// Locking required to access list of groups.
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lock (_groupsLock)
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{
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return _groups
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.Values
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.Where(group => group.HasAccessToPlayQueue(user))
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.Select(group => group.GetInfo())
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.ToList();
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foreach (var group in _groups.Values)
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{
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// Locking required as group is not thread-safe.
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lock (group)
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{
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if (group.HasAccessToPlayQueue(user))
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{
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list.Add(group.GetInfo());
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}
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}
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}
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}
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return list;
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}
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/// <inheritdoc />
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public void HandleRequest(SessionInfo session, IGroupPlaybackRequest request, CancellationToken cancellationToken)
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@ -225,10 +262,7 @@ namespace Emby.Server.Implementations.SyncPlay
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return;
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}
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lock (_groupsLock)
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{
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_sessionToGroupMap.TryGetValue(session.Id, out var group);
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var group = FindJoinedGroup(session);
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if (group == null)
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{
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_logger.LogWarning("Session {SessionId} does not belong to any group.", session.Id);
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@ -238,6 +272,9 @@ namespace Emby.Server.Implementations.SyncPlay
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return;
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}
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// Group lock required as GroupController is not thread-safe.
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lock (group)
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{
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group.HandleRequest(session, request, cancellationToken);
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}
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}
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@ -260,52 +297,57 @@ namespace Emby.Server.Implementations.SyncPlay
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private void OnSessionManagerSessionStarted(object sender, SessionEventArgs e)
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{
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var session = e.SessionInfo;
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lock (_groupsLock)
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{
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if (!IsSessionInGroup(session))
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Guid groupId = FindJoinedGroupId(session);
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if (groupId.Equals(Guid.Empty))
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{
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return;
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}
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var groupId = GetSessionGroup(session);
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var request = new JoinGroupRequest(groupId);
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JoinGroup(session, groupId, request, CancellationToken.None);
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}
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}
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/// <summary>
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/// Checks if a given session has joined a group.
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/// </summary>
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/// <remarks>
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/// Not thread-safe, call only under groups-lock.
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/// </remarks>
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/// <param name="session">The session.</param>
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/// <returns><c>true</c> if the session has joined a group, <c>false</c> otherwise.</returns>
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private bool IsSessionInGroup(SessionInfo session)
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{
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lock (_mapsLock)
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{
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return _sessionToGroupMap.ContainsKey(session.Id);
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}
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}
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/// <summary>
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/// Gets the group joined by the given session, if any.
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/// </summary>
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/// <remarks>
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/// Not thread-safe, call only under groups-lock.
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/// </remarks>
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/// <param name="session">The session.</param>
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/// <returns>The group identifier if the session has joined a group, an empty identifier otherwise.</returns>
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private Guid GetSessionGroup(SessionInfo session)
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/// <returns>The group.</returns>
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private IGroupController FindJoinedGroup(SessionInfo session)
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{
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lock (_mapsLock)
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{
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_sessionToGroupMap.TryGetValue(session.Id, out var group);
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return group?.GroupId ?? Guid.Empty;
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return group;
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}
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}
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/// <summary>
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/// Gets the group identifier joined by the given session, if any.
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/// </summary>
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/// <param name="session">The session.</param>
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/// <returns>The group identifier if the session has joined a group, an empty identifier otherwise.</returns>
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private Guid FindJoinedGroupId(SessionInfo session)
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{
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return FindJoinedGroup(session)?.GroupId ?? Guid.Empty;
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}
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/// <summary>
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/// Maps a session to a group.
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/// </summary>
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/// <remarks>
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/// Not thread-safe, call only under groups-lock.
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/// </remarks>
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/// <param name="session">The session.</param>
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/// <param name="group">The group.</param>
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/// <exception cref="InvalidOperationException">Thrown when the user is in another group already.</exception>
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@ -316,6 +358,8 @@ namespace Emby.Server.Implementations.SyncPlay
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throw new InvalidOperationException("Session is null!");
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}
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lock (_mapsLock)
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{
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if (IsSessionInGroup(session))
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{
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throw new InvalidOperationException("Session in other group already!");
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@ -323,13 +367,11 @@ namespace Emby.Server.Implementations.SyncPlay
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_sessionToGroupMap[session.Id] = group ?? throw new InvalidOperationException("Group is null!");
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}
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}
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/// <summary>
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/// Unmaps a session from a group.
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/// </summary>
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/// <remarks>
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/// Not thread-safe, call only under groups-lock.
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/// </remarks>
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/// <param name="session">The session.</param>
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/// <param name="group">The group.</param>
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/// <exception cref="InvalidOperationException">Thrown when the user is not found in the specified group.</exception>
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@ -345,6 +387,8 @@ namespace Emby.Server.Implementations.SyncPlay
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throw new InvalidOperationException("Group is null!");
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}
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lock (_mapsLock)
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{
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if (!IsSessionInGroup(session))
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{
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throw new InvalidOperationException("Session not in any group!");
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@ -356,6 +400,7 @@ namespace Emby.Server.Implementations.SyncPlay
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throw new InvalidOperationException("Session was in wrong group!");
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}
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}
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}
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/// <summary>
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/// Checks if a given session is allowed to make a given request.
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