jellyfin/MediaBrowser.Server.Implementations/Persistence/SqliteUserDataRepository.cs

using MediaBrowser.Common.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Persistence;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Serialization;
using System;
using System.Collections.Concurrent;
using System.Data;
using System.Data.SQLite;
using System.IO;
using System.Threading;
using System.Threading.Tasks;

namespace MediaBrowser.Server.Implementations.Persistence
{
    public class SqliteUserDataRepository : IUserDataRepository
    {
        private readonly ILogger _logger;

        private readonly ConcurrentDictionary<string, UserItemData> _userData = new ConcurrentDictionary<string, UserItemData>();

        private readonly SemaphoreSlim _writeLock = new SemaphoreSlim(1, 1);

        private SQLiteConnection _connection;

        /// <summary>
        /// Gets the name of the repository
        /// </summary>
        /// <value>The name.</value>
        public string Name
        {
            get
            {
                return "SQLite";
            }
        }

        private readonly IJsonSerializer _jsonSerializer;

        /// <summary>
        /// The _app paths
        /// </summary>
        private readonly IApplicationPaths _appPaths;

        /// <summary>
        /// Initializes a new instance of the <see cref="SqliteUserDataRepository"/> class.
        /// </summary>
        /// <param name="appPaths">The app paths.</param>
        /// <param name="jsonSerializer">The json serializer.</param>
        /// <param name="logManager">The log manager.</param>
        /// <exception cref="System.ArgumentNullException">
        /// jsonSerializer
        /// or
        /// appPaths
        /// </exception>
        public SqliteUserDataRepository(IApplicationPaths appPaths, IJsonSerializer jsonSerializer, ILogManager logManager)
        {
            if (jsonSerializer == null)
            {
                throw new ArgumentNullException("jsonSerializer");
            }
            if (appPaths == null)
            {
                throw new ArgumentNullException("appPaths");
            }

            _jsonSerializer = jsonSerializer;
            _appPaths = appPaths;
            _logger = logManager.GetLogger(GetType().Name);
        }

        /// <summary>
        /// Opens the connection to the database
        /// </summary>
        /// <returns>Task.</returns>
        public async Task Initialize()
        {
            var dbFile = Path.Combine(_appPaths.DataPath, "userdata_v2.db");

            _connection = await SqliteExtensions.ConnectToDb(dbFile).ConfigureAwait(false);

            string[] queries = {

                                "create table if not exists userdata (key nvarchar, userId GUID, rating float null, played bit, playCount int, isFavorite bit, playbackPositionTicks bigint, lastPlayedDate datetime null)",

                                "create unique index if not exists userdataindex on userdata (key, userId)",

                                //pragmas
                                "pragma temp_store = memory"
                               };

            _connection.RunQueries(queries, _logger);

            var oldFile = Path.Combine(_appPaths.DataPath, "userdata.db");

            if (File.Exists(oldFile))
            {
                await UserDataMigration.Migrate(oldFile, _connection, _logger, _jsonSerializer).ConfigureAwait(false);
            }
        }

        /// <summary>
        /// Saves the user data.
        /// </summary>
        /// <param name="userId">The user id.</param>
        /// <param name="key">The key.</param>
        /// <param name="userData">The user data.</param>
        /// <param name="cancellationToken">The cancellation token.</param>
        /// <returns>Task.</returns>
        /// <exception cref="System.ArgumentNullException">userData
        /// or
        /// cancellationToken
        /// or
        /// userId
        /// or
        /// userDataId</exception>
        public async Task SaveUserData(Guid userId, string key, UserItemData userData, CancellationToken cancellationToken)
        {
            if (userData == null)
            {
                throw new ArgumentNullException("userData");
            }
            if (cancellationToken == null)
            {
                throw new ArgumentNullException("cancellationToken");
            }
            if (userId == Guid.Empty)
            {
                throw new ArgumentNullException("userId");
            }
            if (string.IsNullOrEmpty(key))
            {
                throw new ArgumentNullException("key");
            }

            cancellationToken.ThrowIfCancellationRequested();

            try
            {
                await PersistUserData(userId, key, userData, cancellationToken).ConfigureAwait(false);

                var newValue = userData;

                // Once it succeeds, put it into the dictionary to make it available to everyone else
                _userData.AddOrUpdate(GetInternalKey(userId, key), newValue, delegate { return newValue; });
            }
            catch (Exception ex)
            {
                _logger.ErrorException("Error saving user data", ex);

                throw;
            }
        }

        /// <summary>
        /// Gets the internal key.
        /// </summary>
        /// <param name="userId">The user id.</param>
        /// <param name="key">The key.</param>
        /// <returns>System.String.</returns>
        private string GetInternalKey(Guid userId, string key)
        {
            return userId + key;
        }

        /// <summary>
        /// Persists the user data.
        /// </summary>
        /// <param name="userId">The user id.</param>
        /// <param name="key">The key.</param>
        /// <param name="userData">The user data.</param>
        /// <param name="cancellationToken">The cancellation token.</param>
        /// <returns>Task.</returns>
        public async Task PersistUserData(Guid userId, string key, UserItemData userData, CancellationToken cancellationToken)
        {
            cancellationToken.ThrowIfCancellationRequested();

            await _writeLock.WaitAsync(cancellationToken).ConfigureAwait(false);

            SQLiteTransaction transaction = null;

            try
            {
                transaction = _connection.BeginTransaction();

                using (var cmd = _connection.CreateCommand())
                {
                    cmd.CommandText = "replace into userdata (key, userId, rating,played,playCount,isFavorite,playbackPositionTicks,lastPlayedDate) values (@key, @userId, @rating,@played,@playCount,@isFavorite,@playbackPositionTicks,@lastPlayedDate)";

                    cmd.AddParam("@key", key);
                    cmd.AddParam("@userId", userId);

                    cmd.AddParam("@rating", userData.Rating);
                    cmd.AddParam("@played", userData.Played);
                    cmd.AddParam("@playCount", userData.PlayCount);
                    cmd.AddParam("@isFavorite", userData.IsFavorite);
                    cmd.AddParam("@playbackPositionTicks", userData.PlaybackPositionTicks);
                    cmd.AddParam("@lastPlayedDate", userData.LastPlayedDate);
                    
                    cmd.Transaction = transaction;

                    await cmd.ExecuteNonQueryAsync(cancellationToken);
                }

                transaction.Commit();
            }
            catch (OperationCanceledException)
            {
                if (transaction != null)
                {
                    transaction.Rollback();
                }

                throw;
            }
            catch (Exception e)
            {
                _logger.ErrorException("Failed to save user data:", e);

                if (transaction != null)
                {
                    transaction.Rollback();
                }

                throw;
            }
            finally
            {
                if (transaction != null)
                {
                    transaction.Dispose();
                }

                _writeLock.Release();
            }
        }

        /// <summary>
        /// Gets the user data.
        /// </summary>
        /// <param name="userId">The user id.</param>
        /// <param name="key">The key.</param>
        /// <returns>Task{UserItemData}.</returns>
        /// <exception cref="System.ArgumentNullException">
        /// userId
        /// or
        /// key
        /// </exception>
        public UserItemData GetUserData(Guid userId, string key)
        {
            if (userId == Guid.Empty)
            {
                throw new ArgumentNullException("userId");
            }
            if (string.IsNullOrEmpty(key))
            {
                throw new ArgumentNullException("key");
            }

            return _userData.GetOrAdd(GetInternalKey(userId, key), keyName => RetrieveUserData(userId, key));
        }

        /// <summary>
        /// Retrieves the user data.
        /// </summary>
        /// <param name="userId">The user id.</param>
        /// <param name="key">The key.</param>
        /// <returns>Task{UserItemData}.</returns>
        private UserItemData RetrieveUserData(Guid userId, string key)
        {
            using (var cmd = _connection.CreateCommand())
            {
                cmd.CommandText = "select rating,played,playCount,isFavorite,playbackPositionTicks,lastPlayedDate from userdata where key = @key and userId=@userId";

                var idParam = cmd.Parameters.Add("@key", DbType.String);
                idParam.Value = key;

                var userIdParam = cmd.Parameters.Add("@userId", DbType.Guid);
                userIdParam.Value = userId;

                var userData = new UserItemData
                {
                    UserId = userId,
                    Key = key
                };

                using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.SingleResult | CommandBehavior.SingleRow))
                {
                    if (reader.Read())
                    {
                        if (!reader.IsDBNull(0))
                        {
                            userData.Rating = reader.GetDouble(0);
                        }

                        userData.Played = reader.GetBoolean(1);
                        userData.PlayCount = reader.GetInt32(2);
                        userData.IsFavorite = reader.GetBoolean(3);
                        userData.PlaybackPositionTicks = reader.GetInt64(4);

                        if (!reader.IsDBNull(5))
                        {
                            userData.LastPlayedDate = reader.GetDateTime(5);
                        }
                    }
                }

                return userData;
            }
        }

        /// <summary>
        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
        /// </summary>
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        private readonly object _disposeLock = new object();

        /// <summary>
        /// Releases unmanaged and - optionally - managed resources.
        /// </summary>
        /// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
        protected virtual void Dispose(bool dispose)
        {
            if (dispose)
            {
                try
                {
                    lock (_disposeLock)
                    {
                        if (_connection != null)
                        {
                            if (_connection.IsOpen())
                            {
                                _connection.Close();
                            }

                            _connection.Dispose();
                            _connection = null;
                        }
                    }
                }
                catch (Exception ex)
                {
                    _logger.ErrorException("Error disposing database", ex);
                }
            }
        }
    }
}