sqlite

MediaBrowser.Server.Implementations/Persistence/SqliteUserDataRepository.cs

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+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 : SqliteRepository, IUserDataRepository
+    {
+        private readonly ConcurrentDictionary<string, UserItemData> _userData = new ConcurrentDictionary<string, UserItemData>();
+
+        private readonly SemaphoreSlim _writeLock = new SemaphoreSlim(1, 1);
+
+        /// <summary>
+        /// The repository name
+        /// </summary>
+        public const string RepositoryName = "SQLite";
+
+        /// <summary>
+        /// Gets the name of the repository
+        /// </summary>
+        /// <value>The name.</value>
+        public string Name
+        {
+            get
+            {
+                return RepositoryName;
+            }
+        }
+
+        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)
+            : base(logManager)
+        {
+            if (jsonSerializer == null)
+            {
+                throw new ArgumentNullException("jsonSerializer");
+            }
+            if (appPaths == null)
+            {
+                throw new ArgumentNullException("appPaths");
+            }
+
+            _jsonSerializer = jsonSerializer;
+            _appPaths = appPaths;
+        }
+
+        /// <summary>
+        /// Opens the connection to the database
+        /// </summary>
+        /// <returns>Task.</returns>
+        public async Task Initialize()
+        {
+            var dbFile = Path.Combine(_appPaths.DataPath, "userdata.db");
+
+            await ConnectToDb(dbFile).ConfigureAwait(false);
+
+            string[] queries = {
+
+                                "create table if not exists userdata (key nvarchar, userId GUID, data BLOB)",
+                                "create unique index if not exists userdataindex on userdata (key, userId)",
+                                "create table if not exists schema_version (table_name primary key, version)",
+                                //pragmas
+                                "pragma temp_store = memory"
+                               };
+
+            RunQueries(queries);
+        }
+
+        /// <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();
+
+            var serialized = _jsonSerializer.SerializeToBytes(userData);
+
+            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, data) values (@1, @2, @3)";
+                    cmd.AddParam("@1", key);
+                    cmd.AddParam("@2", userId);
+                    cmd.AddParam("@3", serialized);
+
+                    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 data 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;
+
+                using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.SingleResult | CommandBehavior.SingleRow))
+                {
+                    if (reader.Read())
+                    {
+                        using (var stream = GetStream(reader, 0))
+                        {
+                            return _jsonSerializer.DeserializeFromStream<UserItemData>(stream);
+                        }
+                    }
+                }
+
+                return new UserItemData();
+            }
+        }
+    }
+}