mirror of
https://github.com/jellyfin/jellyfin.git
synced 2024-09-06 13:57:14 -04:00
380 lines
11 KiB
C#
380 lines
11 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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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;
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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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protected string DbFilePath { get; set; }
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protected ReaderWriterLockSlim WriteLock;
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protected ILogger Logger { get; private set; }
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protected BaseSqliteRepository(ILogger logger)
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{
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Logger = logger;
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WriteLock = new ReaderWriterLockSlim(LockRecursionPolicy.NoRecursion);
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}
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protected TransactionMode TransactionMode => TransactionMode.Deferred;
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protected TransactionMode ReadTransactionMode => TransactionMode.Deferred;
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internal static int ThreadSafeMode { get; set; }
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static BaseSqliteRepository()
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{
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SQLite3.EnableSharedCache = false;
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int rc = raw.sqlite3_config(raw.SQLITE_CONFIG_MEMSTATUS, 0);
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//CheckOk(rc);
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rc = raw.sqlite3_config(raw.SQLITE_CONFIG_MULTITHREAD, 1);
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//rc = raw.sqlite3_config(raw.SQLITE_CONFIG_SINGLETHREAD, 1);
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//rc = raw.sqlite3_config(raw.SQLITE_CONFIG_SERIALIZED, 1);
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//CheckOk(rc);
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rc = raw.sqlite3_enable_shared_cache(1);
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ThreadSafeMode = raw.sqlite3_threadsafe();
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}
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private static bool _versionLogged;
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private string _defaultWal;
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protected ManagedConnection _connection;
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protected virtual bool EnableSingleConnection => true;
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protected ManagedConnection CreateConnection(bool isReadOnly = false)
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{
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if (_connection != null)
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{
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return _connection;
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}
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lock (WriteLock)
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{
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if (!_versionLogged)
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{
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_versionLogged = true;
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Logger.LogInformation("Sqlite version: " + SQLite3.Version);
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Logger.LogInformation("Sqlite compiler options: " + string.Join(",", SQLite3.CompilerOptions.ToArray()));
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}
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ConnectionFlags connectionFlags;
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if (isReadOnly)
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{
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//Logger.LogInformation("Opening read connection");
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//connectionFlags = ConnectionFlags.ReadOnly;
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connectionFlags = ConnectionFlags.Create;
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connectionFlags |= ConnectionFlags.ReadWrite;
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}
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else
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{
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//Logger.LogInformation("Opening write connection");
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connectionFlags = ConnectionFlags.Create;
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connectionFlags |= ConnectionFlags.ReadWrite;
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}
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if (EnableSingleConnection)
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{
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connectionFlags |= ConnectionFlags.PrivateCache;
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}
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else
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{
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connectionFlags |= ConnectionFlags.SharedCached;
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}
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connectionFlags |= ConnectionFlags.NoMutex;
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var db = SQLite3.Open(DbFilePath, connectionFlags, null);
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try
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{
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if (string.IsNullOrWhiteSpace(_defaultWal))
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{
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_defaultWal = db.Query("PRAGMA journal_mode").SelectScalarString().First();
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Logger.LogInformation("Default journal_mode for {0} is {1}", DbFilePath, _defaultWal);
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}
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var queries = new List<string>
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{
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//"PRAGMA cache size=-10000"
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//"PRAGMA read_uncommitted = true",
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"PRAGMA synchronous=Normal"
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};
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if (CacheSize.HasValue)
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{
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queries.Add("PRAGMA cache_size=" + CacheSize.Value.ToString(CultureInfo.InvariantCulture));
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}
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if (EnableTempStoreMemory)
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{
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queries.Add("PRAGMA temp_store = memory");
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}
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else
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{
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queries.Add("PRAGMA temp_store = file");
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}
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foreach (var query in queries)
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{
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db.Execute(query);
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}
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}
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catch
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{
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using (db)
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{
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}
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throw;
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}
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_connection = new ManagedConnection(db, false);
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return _connection;
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}
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}
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public IStatement PrepareStatement(ManagedConnection connection, string sql)
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{
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return connection.PrepareStatement(sql);
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}
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public IStatement PrepareStatementSafe(ManagedConnection connection, string sql)
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{
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return connection.PrepareStatement(sql);
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}
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public IStatement PrepareStatement(IDatabaseConnection connection, string sql)
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{
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return connection.PrepareStatement(sql);
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}
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public IStatement PrepareStatementSafe(IDatabaseConnection connection, string sql)
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{
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return connection.PrepareStatement(sql);
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}
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public List<IStatement> PrepareAll(IDatabaseConnection connection, IEnumerable<string> sql)
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{
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return PrepareAllSafe(connection, sql);
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}
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public List<IStatement> PrepareAllSafe(IDatabaseConnection connection, IEnumerable<string> sql)
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{
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return sql.Select(connection.PrepareStatement).ToList();
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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(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 void RunDefaultInitialization(ManagedConnection db)
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{
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var queries = new List<string>
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{
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"PRAGMA journal_mode=WAL",
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"PRAGMA page_size=4096",
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"PRAGMA synchronous=Normal"
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};
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if (EnableTempStoreMemory)
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{
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queries.AddRange(new List<string>
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{
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"pragma default_temp_store = memory",
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"pragma temp_store = memory"
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});
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}
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else
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{
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queries.AddRange(new List<string>
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{
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"pragma temp_store = file"
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});
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}
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db.ExecuteAll(string.Join(";", queries));
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Logger.LogInformation("PRAGMA synchronous=" + db.Query("PRAGMA synchronous").SelectScalarString().First());
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}
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protected virtual bool EnableTempStoreMemory => false;
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protected virtual int? CacheSize => null;
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private bool _disposed;
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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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public void Dispose()
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{
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_disposed = true;
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Dispose(true);
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}
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private readonly object _disposeLock = new object();
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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 (dispose)
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{
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DisposeConnection();
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}
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}
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private void DisposeConnection()
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{
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try
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{
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lock (_disposeLock)
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{
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using (WriteLock.Write())
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{
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if (_connection != null)
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{
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using (_connection)
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{
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_connection.Close();
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}
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_connection = null;
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}
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CloseConnection();
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}
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}
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}
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catch (Exception ex)
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{
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Logger.LogError(ex, "Error disposing database");
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}
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}
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protected virtual void CloseConnection()
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{
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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 list = 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[1].SQLiteType != SQLiteType.Null)
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{
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var name = row[1].ToString();
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list.Add(name);
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}
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}
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return list;
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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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}
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public static class ReaderWriterLockSlimExtensions
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{
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private sealed class ReadLockToken : IDisposable
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{
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private ReaderWriterLockSlim _sync;
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public ReadLockToken(ReaderWriterLockSlim sync)
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{
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_sync = sync;
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sync.EnterReadLock();
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}
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public void Dispose()
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{
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if (_sync != null)
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{
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_sync.ExitReadLock();
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_sync = null;
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}
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}
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}
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private sealed class WriteLockToken : IDisposable
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{
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private ReaderWriterLockSlim _sync;
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public WriteLockToken(ReaderWriterLockSlim sync)
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{
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_sync = sync;
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sync.EnterWriteLock();
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}
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public void Dispose()
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{
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if (_sync != null)
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{
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_sync.ExitWriteLock();
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_sync = null;
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}
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}
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}
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public static IDisposable Read(this ReaderWriterLockSlim obj)
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{
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//if (BaseSqliteRepository.ThreadSafeMode > 0)
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//{
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// return new DummyToken();
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//}
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return new WriteLockToken(obj);
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}
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public static IDisposable Write(this ReaderWriterLockSlim obj)
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{
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//if (BaseSqliteRepository.ThreadSafeMode > 0)
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//{
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// return new DummyToken();
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//}
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return new WriteLockToken(obj);
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}
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}
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}
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