mirror of
https://github.com/jellyfin/jellyfin.git
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305 lines
11 KiB
C#
305 lines
11 KiB
C#
using MediaBrowser.Common.Configuration;
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using MediaBrowser.Common.Kernel;
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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.Persistence;
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Serialization;
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using MediaBrowser.Server.Implementations.Reflection;
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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.IO;
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using System.Threading;
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using System.Threading.Tasks;
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namespace MediaBrowser.Server.Implementations.Sqlite
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{
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/// <summary>
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/// Class SQLiteItemRepository
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/// </summary>
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public class SQLiteItemRepository : SqliteRepository, IItemRepository
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{
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/// <summary>
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/// The _type mapper
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/// </summary>
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private readonly TypeMapper _typeMapper = new TypeMapper();
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/// <summary>
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/// The repository name
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/// </summary>
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public const string RepositoryName = "SQLite";
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/// <summary>
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/// Gets the name of the repository
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/// </summary>
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/// <value>The name.</value>
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public string Name
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{
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get
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{
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return RepositoryName;
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}
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}
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/// <summary>
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/// Gets the json serializer.
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/// </summary>
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/// <value>The json serializer.</value>
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private readonly IJsonSerializer _jsonSerializer;
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/// <summary>
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/// The _app paths
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/// </summary>
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private readonly IApplicationPaths _appPaths;
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/// <summary>
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/// Initializes a new instance of the <see cref="SQLiteUserDataRepository" /> class.
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/// </summary>
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/// <param name="appPaths">The app paths.</param>
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/// <param name="jsonSerializer">The json serializer.</param>
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/// <param name="logger">The logger.</param>
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/// <exception cref="System.ArgumentNullException">appPaths</exception>
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public SQLiteItemRepository(IApplicationPaths appPaths, IJsonSerializer jsonSerializer, ILogger logger)
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: base(logger)
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{
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if (appPaths == null)
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{
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throw new ArgumentNullException("appPaths");
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}
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if (jsonSerializer == null)
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{
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throw new ArgumentNullException("jsonSerializer");
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}
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_appPaths = appPaths;
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_jsonSerializer = jsonSerializer;
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}
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/// <summary>
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/// Opens the connection to the database
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/// </summary>
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/// <returns>Task.</returns>
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public async Task Initialize()
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{
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var dbFile = Path.Combine(_appPaths.DataPath, "library.db");
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await ConnectToDB(dbFile).ConfigureAwait(false);
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string[] queries = {
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"create table if not exists items (guid GUID primary key, obj_type, data BLOB)",
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"create index if not exists idx_items on items(guid)",
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"create table if not exists children (guid GUID, child GUID)",
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"create unique index if not exists idx_children on children(guid, child)",
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"create table if not exists schema_version (table_name primary key, version)",
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//triggers
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TriggerSql,
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//pragmas
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"pragma temp_store = memory"
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};
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RunQueries(queries);
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}
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//cascade delete triggers
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/// <summary>
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/// The trigger SQL
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/// </summary>
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protected string TriggerSql =
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@"CREATE TRIGGER if not exists delete_item
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AFTER DELETE
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ON items
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FOR EACH ROW
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BEGIN
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DELETE FROM children WHERE children.guid = old.child;
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DELETE FROM children WHERE children.child = old.child;
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END";
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/// <summary>
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/// Save a standard item in the repo
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/// </summary>
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/// <param name="item">The item.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task.</returns>
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/// <exception cref="System.ArgumentNullException">item</exception>
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public Task SaveItem(BaseItem item, CancellationToken cancellationToken)
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{
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if (item == null)
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{
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throw new ArgumentNullException("item");
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}
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if (cancellationToken == null)
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{
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throw new ArgumentNullException("cancellationToken");
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}
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cancellationToken.ThrowIfCancellationRequested();
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return Task.Run(() =>
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{
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var serialized = _jsonSerializer.SerializeToBytes(item);
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cancellationToken.ThrowIfCancellationRequested();
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var cmd = connection.CreateCommand();
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cmd.CommandText = "replace into items (guid, obj_type, data) values (@1, @2, @3)";
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cmd.AddParam("@1", item.Id);
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cmd.AddParam("@2", item.GetType().FullName);
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cmd.AddParam("@3", serialized);
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QueueCommand(cmd);
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});
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}
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/// <summary>
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/// Retrieve a standard item from the repo
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/// </summary>
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/// <param name="id">The id.</param>
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/// <returns>BaseItem.</returns>
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/// <exception cref="System.ArgumentException"></exception>
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public BaseItem RetrieveItem(Guid id)
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{
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if (id == Guid.Empty)
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{
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throw new ArgumentException();
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}
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return RetrieveItemInternal(id);
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}
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/// <summary>
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/// Internal retrieve from items or users table
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/// </summary>
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/// <param name="id">The id.</param>
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/// <returns>BaseItem.</returns>
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/// <exception cref="System.ArgumentException"></exception>
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protected BaseItem RetrieveItemInternal(Guid id)
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{
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if (id == Guid.Empty)
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{
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throw new ArgumentException();
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}
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var cmd = connection.CreateCommand();
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cmd.CommandText = "select obj_type,data from items where guid = @guid";
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var guidParam = cmd.Parameters.Add("@guid", DbType.Guid);
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guidParam.Value = id;
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using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.SingleResult | CommandBehavior.SingleRow))
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{
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if (reader.Read())
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{
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var type = reader.GetString(0);
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using (var stream = GetStream(reader, 1))
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{
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var itemType = _typeMapper.GetType(type);
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if (itemType == null)
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{
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Logger.Error("Cannot find type {0}. Probably belongs to plug-in that is no longer loaded.", type);
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return null;
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}
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var item = _jsonSerializer.DeserializeFromStream(stream, itemType);
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return item as BaseItem;
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}
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}
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}
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return null;
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}
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/// <summary>
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/// Retrieve all the children of the given folder
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/// </summary>
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/// <param name="parent">The parent.</param>
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/// <returns>IEnumerable{BaseItem}.</returns>
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/// <exception cref="System.ArgumentNullException"></exception>
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public IEnumerable<BaseItem> RetrieveChildren(Folder parent)
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{
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if (parent == null)
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{
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throw new ArgumentNullException();
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}
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var cmd = connection.CreateCommand();
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cmd.CommandText = "select obj_type,data from items where guid in (select child from children where guid = @guid)";
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var guidParam = cmd.Parameters.Add("@guid", DbType.Guid);
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guidParam.Value = parent.Id;
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using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.SingleResult))
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{
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while (reader.Read())
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{
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var type = reader.GetString(0);
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using (var stream = GetStream(reader, 1))
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{
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var itemType = _typeMapper.GetType(type);
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if (itemType == null)
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{
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Logger.Error("Cannot find type {0}. Probably belongs to plug-in that is no longer loaded.", type);
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continue;
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}
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var item = _jsonSerializer.DeserializeFromStream(stream, itemType) as BaseItem;
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if (item != null)
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{
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item.Parent = parent;
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yield return item;
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}
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}
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}
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}
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}
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/// <summary>
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/// Save references to all the children for the given folder
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/// (Doesn't actually save the child entities)
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/// </summary>
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/// <param name="id">The id.</param>
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/// <param name="children">The children.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task.</returns>
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/// <exception cref="System.ArgumentNullException">id</exception>
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public Task SaveChildren(Guid id, IEnumerable<BaseItem> children, CancellationToken cancellationToken)
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{
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if (id == Guid.Empty)
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{
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throw new ArgumentNullException("id");
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}
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if (children == null)
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{
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throw new ArgumentNullException("children");
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}
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if (cancellationToken == null)
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{
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throw new ArgumentNullException("cancellationToken");
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}
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cancellationToken.ThrowIfCancellationRequested();
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return Task.Run(() =>
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{
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var cmd = connection.CreateCommand();
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cmd.CommandText = "delete from children where guid = @guid";
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cmd.AddParam("@guid", id);
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QueueCommand(cmd);
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foreach (var child in children)
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{
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var guid = child.Id;
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cmd = connection.CreateCommand();
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cmd.AddParam("@guid", id);
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cmd.CommandText = "replace into children (guid, child) values (@guid, @child)";
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var childParam = cmd.Parameters.Add("@child", DbType.Guid);
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childParam.Value = guid;
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QueueCommand(cmd);
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}
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});
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}
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}
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}
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