mirror of
https://github.com/jellyfin/jellyfin.git
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303 lines
9.5 KiB
C#
303 lines
9.5 KiB
C#
#nullable disable
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#pragma warning disable CS1591
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading;
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using Microsoft.Extensions.Logging;
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using SQLitePCL.pretty;
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namespace Emby.Server.Implementations.Data
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{
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public abstract class BaseSqliteRepository : IDisposable
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{
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private bool _disposed = false;
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/// <summary>
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/// Initializes a new instance of the <see cref="BaseSqliteRepository"/> class.
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/// </summary>
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/// <param name="logger">The logger.</param>
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protected BaseSqliteRepository(ILogger<BaseSqliteRepository> logger)
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{
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Logger = logger;
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}
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/// <summary>
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/// Gets or sets the path to the DB file.
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/// </summary>
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/// <value>Path to the DB file.</value>
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protected string DbFilePath { get; set; }
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/// <summary>
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/// Gets the logger.
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/// </summary>
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/// <value>The logger.</value>
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protected ILogger<BaseSqliteRepository> Logger { get; }
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/// <summary>
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/// Gets the default connection flags.
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/// </summary>
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/// <value>The default connection flags.</value>
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protected virtual ConnectionFlags DefaultConnectionFlags => ConnectionFlags.NoMutex;
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/// <summary>
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/// Gets the transaction mode.
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/// </summary>
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/// <value>The transaction mode.</value>>
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protected TransactionMode TransactionMode => TransactionMode.Deferred;
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/// <summary>
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/// Gets the transaction mode for read-only operations.
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/// </summary>
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/// <value>The transaction mode.</value>
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protected TransactionMode ReadTransactionMode => TransactionMode.Deferred;
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/// <summary>
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/// Gets the cache size.
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/// </summary>
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/// <value>The cache size or null.</value>
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protected virtual int? CacheSize => null;
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/// <summary>
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/// Gets the journal mode. <see href="https://www.sqlite.org/pragma.html#pragma_journal_mode" />
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/// </summary>
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/// <value>The journal mode.</value>
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protected virtual string JournalMode => "TRUNCATE";
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/// <summary>
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/// Gets the page size.
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/// </summary>
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/// <value>The page size or null.</value>
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protected virtual int? PageSize => null;
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/// <summary>
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/// Gets the temp store mode.
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/// </summary>
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/// <value>The temp store mode.</value>
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/// <see cref="TempStoreMode"/>
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protected virtual TempStoreMode TempStore => TempStoreMode.Default;
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/// <summary>
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/// Gets the synchronous mode.
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/// </summary>
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/// <value>The synchronous mode or null.</value>
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/// <see cref="SynchronousMode"/>
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protected virtual SynchronousMode? Synchronous => null;
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/// <summary>
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/// Gets or sets the write lock.
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/// </summary>
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/// <value>The write lock.</value>
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protected SemaphoreSlim WriteLock { get; set; } = new SemaphoreSlim(1, 1);
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/// <summary>
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/// Gets or sets the write connection.
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/// </summary>
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/// <value>The write connection.</value>
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protected SQLiteDatabaseConnection WriteConnection { get; set; }
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protected ManagedConnection GetConnection(bool _ = false)
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{
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WriteLock.Wait();
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if (WriteConnection != null)
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{
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return new ManagedConnection(WriteConnection, WriteLock);
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}
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WriteConnection = SQLite3.Open(
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DbFilePath,
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DefaultConnectionFlags | ConnectionFlags.Create | ConnectionFlags.ReadWrite,
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null);
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if (CacheSize.HasValue)
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{
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WriteConnection.Execute("PRAGMA cache_size=" + CacheSize.Value);
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}
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if (!string.IsNullOrWhiteSpace(JournalMode))
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{
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WriteConnection.Execute("PRAGMA journal_mode=" + JournalMode);
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}
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if (Synchronous.HasValue)
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{
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WriteConnection.Execute("PRAGMA synchronous=" + (int)Synchronous.Value);
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}
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if (PageSize.HasValue)
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{
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WriteConnection.Execute("PRAGMA page_size=" + PageSize.Value);
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}
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WriteConnection.Execute("PRAGMA temp_store=" + (int)TempStore);
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// Configuration and pragmas can affect VACUUM so it needs to be last.
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WriteConnection.Execute("VACUUM");
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return new ManagedConnection(WriteConnection, WriteLock);
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}
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public IStatement PrepareStatement(ManagedConnection connection, string sql)
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=> connection.PrepareStatement(sql);
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public IStatement PrepareStatement(IDatabaseConnection connection, string sql)
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=> connection.PrepareStatement(sql);
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public IStatement[] PrepareAll(IDatabaseConnection connection, IReadOnlyList<string> sql)
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{
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int len = sql.Count;
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IStatement[] statements = new IStatement[len];
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for (int i = 0; i < len; i++)
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{
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statements[i] = connection.PrepareStatement(sql[i]);
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}
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return statements;
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}
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protected bool TableExists(ManagedConnection connection, string name)
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{
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return connection.RunInTransaction(
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db =>
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{
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using (var statement = PrepareStatement(db, "select DISTINCT tbl_name from sqlite_master"))
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{
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foreach (var row in statement.ExecuteQuery())
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{
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if (string.Equals(name, row.GetString(0), StringComparison.OrdinalIgnoreCase))
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{
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return true;
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}
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}
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}
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return false;
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}, ReadTransactionMode);
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}
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protected List<string> GetColumnNames(IDatabaseConnection connection, string table)
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{
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var columnNames = new List<string>();
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foreach (var row in connection.Query("PRAGMA table_info(" + table + ")"))
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{
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if (row.TryGetString(1, out var columnName))
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{
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columnNames.Add(columnName);
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}
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}
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return columnNames;
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}
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protected void AddColumn(IDatabaseConnection connection, string table, string columnName, string type, List<string> existingColumnNames)
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{
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if (existingColumnNames.Contains(columnName, StringComparer.OrdinalIgnoreCase))
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{
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return;
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}
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connection.Execute("alter table " + table + " add column " + columnName + " " + type + " NULL");
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}
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protected void CheckDisposed()
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{
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if (_disposed)
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{
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throw new ObjectDisposedException(GetType().Name, "Object has been disposed and cannot be accessed.");
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}
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}
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/// <inheritdoc />
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public void Dispose()
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{
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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/// <summary>
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/// Releases unmanaged and - optionally - managed resources.
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/// </summary>
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/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
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protected virtual void Dispose(bool dispose)
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{
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if (_disposed)
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{
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return;
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}
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if (dispose)
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{
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WriteLock.Wait();
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try
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{
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WriteConnection?.Dispose();
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}
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finally
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{
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WriteLock.Release();
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}
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WriteLock.Dispose();
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}
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WriteConnection = null;
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WriteLock = null;
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_disposed = true;
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}
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}
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/// <summary>
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/// The disk synchronization mode, controls how aggressively SQLite will write data
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/// all the way out to physical storage.
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/// </summary>
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public enum SynchronousMode
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{
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/// <summary>
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/// SQLite continues without syncing as soon as it has handed data off to the operating system.
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/// </summary>
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Off = 0,
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/// <summary>
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/// SQLite database engine will still sync at the most critical moments.
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/// </summary>
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Normal = 1,
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/// <summary>
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/// SQLite database engine will use the xSync method of the VFS
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/// to ensure that all content is safely written to the disk surface prior to continuing.
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/// </summary>
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Full = 2,
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/// <summary>
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/// EXTRA synchronous is like FULL with the addition that the directory containing a rollback journal
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/// is synced after that journal is unlinked to commit a transaction in DELETE mode.
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/// </summary>
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Extra = 3
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}
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/// <summary>
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/// Storage mode used by temporary database files.
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/// </summary>
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public enum TempStoreMode
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{
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/// <summary>
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/// The compile-time C preprocessor macro SQLITE_TEMP_STORE
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/// is used to determine where temporary tables and indices are stored.
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/// </summary>
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Default = 0,
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/// <summary>
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/// Temporary tables and indices are stored in a file.
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/// </summary>
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File = 1,
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/// <summary>
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/// Temporary tables and indices are kept in as if they were pure in-memory databases memory.
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/// </summary>
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Memory = 2
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}
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}
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