Add SQLite transport2 (#162)

* Add SQLiteTransport2

* cleanup

src/Speckle.Sdk/Api/Operations/Operations.Send.cs

@@ -50,6 +50,42 @@ public partial class Operations
     }
   }
 
+  /// <summary>
+  /// Sends a Speckle Object to the provided <paramref name="transport"/> and (optionally) the default local cache
+  /// </summary>
+  /// <remarks/>
+  /// <inheritdoc cref="Send(Base, IReadOnlyCollection{ITransport}, IProgress{ProgressArgs}?, CancellationToken)"/>
+  /// <param name="useDefaultCache">When <see langword="true"/>, an additional <see cref="SQLiteTransport"/> will be included</param>
+  /// <exception cref="ArgumentNullException">The <paramref name="transport"/> or <paramref name="value"/> was <see langword="null"/></exception>
+  /// <example><code>
+  /// using ServerTransport destination = new(account, streamId);
+  /// var (objectId, references) = await Send(mySpeckleObject, destination, true);
+  /// </code></example>
+  public async Task<(string rootObjId, IReadOnlyDictionary<string, ObjectReference> convertedReferences)> Send(
+    Base value,
+    IServerTransport transport,
+    bool useDefaultCache,
+    IProgress<ProgressArgs>? onProgressAction = null,
+    CancellationToken cancellationToken = default
+  )
+  {
+    if (transport is null)
+    {
+      throw new ArgumentNullException(nameof(transport), "Expected a transport to be explicitly specified");
+    }
+
+    List<ITransport> transports = new() { transport };
+    using SQLiteTransport2? localCache = useDefaultCache
+      ? new SQLiteTransport2(transport.StreamId) { TransportName = "LC2" }
+      : null;
+    if (localCache is not null)
+    {
+      transports.Add(localCache);
+    }
+
+    return await Send(value, transports, onProgressAction, cancellationToken).ConfigureAwait(false);
+  }
+
   /// <summary>
   /// Sends a Speckle Object to the provided <paramref name="transport"/> and (optionally) the default local cache
   /// </summary>

src/Speckle.Sdk/Serialisation/Utilities/SqlitePaths.cs

@@ -0,0 +1,30 @@
+using Speckle.Sdk.Logging;
+using Speckle.Sdk.Transports;
+
+namespace Speckle.Sdk.Serialisation.Utilities;
+
+public static class SqlitePaths
+{
+  private const string APPLICATION_NAME = "Speckle";
+  private const string DATA_FOLDER = "Projects";
+  private static readonly string basePath = SpecklePathProvider.UserApplicationDataPath();
+
+  public static string BlobStorageFolder =>
+    SpecklePathProvider.BlobStoragePath(Path.Combine(basePath, APPLICATION_NAME));
+
+  public static string GetDBPath(string streamId)
+  {
+    var dir = Path.Combine(basePath, APPLICATION_NAME, DATA_FOLDER);
+    var db = Path.Combine(dir, $"{streamId}.db");
+    try
+    {
+      Directory.CreateDirectory(dir); //ensure dir is there
+      return db;
+    }
+    catch (Exception ex)
+      when (ex is ArgumentException or IOException or UnauthorizedAccessException or NotSupportedException)
+    {
+      throw new TransportException($"Path was invalid or could not be created {db}", ex);
+    }
+  }
+}

src/Speckle.Sdk/Serialisation/V2/SQLiteCacheManager.cs

@@ -1,33 +1,15 @@
 using Microsoft.Data.Sqlite;
-using Speckle.Sdk.Logging;
-using Speckle.Sdk.Transports;
+using Speckle.Sdk.Serialisation.Utilities;
 
 namespace Speckle.Sdk.Serialisation.V2;
 
 public abstract class SQLiteCacheManager
 {
-  private readonly string _rootPath;
-  private const string APPLICATION_NAME = "Speckle";
-  private const string DATA_FOLDER = "Projects";
-
   protected SQLiteCacheManager(string streamId)
   {
-    var basePath = SpecklePathProvider.UserApplicationDataPath();
+    string rootPath = SqlitePaths.GetDBPath(streamId);
 
-    try
-    {
-      var dir = Path.Combine(basePath, APPLICATION_NAME, DATA_FOLDER);
-      _rootPath = Path.Combine(dir, $"{streamId}.db");
-
-      Directory.CreateDirectory(dir); //ensure dir is there
-    }
-    catch (Exception ex)
-      when (ex is ArgumentException or IOException or UnauthorizedAccessException or NotSupportedException)
-    {
-      throw new TransportException($"Path was invalid or could not be created {_rootPath}", ex);
-    }
-
-    ConnectionString = $"Data Source={_rootPath};";
+    ConnectionString = $"Data Source={rootPath};";
     Initialize();
   }
 

src/Speckle.Sdk/Transports/SQLiteTransport2.cs

@@ -0,0 +1,408 @@
+using System.Collections.Concurrent;
+using System.Diagnostics;
+using System.Text;
+using System.Timers;
+using Microsoft.Data.Sqlite;
+using Speckle.Sdk.Logging;
+using Speckle.Sdk.Models;
+using Speckle.Sdk.Serialisation.Utilities;
+using Timer = System.Timers.Timer;
+
+namespace Speckle.Sdk.Transports;
+
+public sealed class SQLiteTransport2 : IDisposable, ICloneable, ITransport, IBlobCapableTransport
+{
+  private readonly string _streamId;
+  private bool _isWriting;
+  private const int MAX_TRANSACTION_SIZE = 1000;
+  private const int POLL_INTERVAL = 500;
+
+  private ConcurrentQueue<(string id, string serializedObject, int byteCount)> _queue = new();
+
+  /// <summary>
+  /// Timer that ensures queue is consumed if less than MAX_TRANSACTION_SIZE objects are being sent.
+  /// </summary>
+  private readonly Timer _writeTimer;
+
+  public SQLiteTransport2(string streamId)
+  {
+    _streamId = streamId;
+
+    _rootPath = SqlitePaths.GetDBPath(streamId);
+
+    _connectionString = $"Data Source={_rootPath};";
+
+    Initialize();
+
+    _writeTimer = new Timer
+    {
+      AutoReset = true,
+      Enabled = false,
+      Interval = POLL_INTERVAL,
+    };
+    _writeTimer.Elapsed += WriteTimerElapsed;
+  }
+
+  private readonly string _rootPath;
+
+  private readonly string _connectionString;
+
+  private SqliteConnection Connection { get; set; }
+  private readonly SemaphoreSlim _connectionLock = new(1, 1);
+
+  public string BlobStorageFolder => SqlitePaths.BlobStorageFolder;
+
+  public void SaveBlob(Blob obj)
+  {
+    var blobPath = obj.originalPath;
+    var targetPath = obj.GetLocalDestinationPath(BlobStorageFolder);
+    File.Copy(blobPath, targetPath, true);
+  }
+
+  public object Clone()
+  {
+    return new SQLiteTransport2(_streamId)
+    {
+      OnProgressAction = OnProgressAction,
+      CancellationToken = CancellationToken,
+    };
+  }
+
+  public void Dispose()
+  {
+    // TODO: Check if it's still writing?
+    Connection.Close();
+    Connection.Dispose();
+    _writeTimer.Dispose();
+    _connectionLock.Dispose();
+  }
+
+  public string TransportName { get; set; } = "SQLite";
+
+  public Dictionary<string, object> TransportContext =>
+    new()
+    {
+      { "name", TransportName },
+      { "type", GetType().Name },
+      { "streamId", _streamId },
+      { "blobStorageFolder", BlobStorageFolder },
+    };
+
+  public CancellationToken CancellationToken { get; set; }
+
+  public IProgress<ProgressArgs>? OnProgressAction { get; set; }
+
+  public int SavedObjectCount { get; private set; }
+
+  public TimeSpan Elapsed { get; private set; }
+
+  public void BeginWrite()
+  {
+    _queue = new();
+    SavedObjectCount = 0;
+  }
+
+  public void EndWrite() { }
+
+  public Task<Dictionary<string, bool>> HasObjects(IReadOnlyList<string> objectIds)
+  {
+    Dictionary<string, bool> ret = new(objectIds.Count);
+    // Initialize with false so that canceled queries still return a dictionary item for every object id
+    foreach (string objectId in objectIds)
+    {
+      ret[objectId] = false;
+    }
+
+    try
+    {
+      const string COMMAND_TEXT = "SELECT 1 FROM objects WHERE hash = @hash LIMIT 1 ";
+      using var command = new SqliteCommand(COMMAND_TEXT, Connection);
+
+      foreach (string objectId in objectIds)
+      {
+        CancellationToken.ThrowIfCancellationRequested();
+
+        command.Parameters.Clear();
+        command.Parameters.AddWithValue("@hash", objectId);
+
+        using var reader = command.ExecuteReader();
+        bool rowFound = reader.Read();
+        ret[objectId] = rowFound;
+      }
+    }
+    catch (SqliteException ex)
+    {
+      throw new TransportException("SQLite transport failed", ex);
+    }
+
+    return Task.FromResult(ret);
+  }
+
+  /// <exception cref="SqliteException">Failed to initialize connection to the SQLite DB</exception>
+  private void Initialize()
+  {
+    // NOTE: used for creating partioned object tables.
+    //string[] HexChars = new string[] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
+    //var cart = new List<string>();
+    //foreach (var str in HexChars)
+    //  foreach (var str2 in HexChars)
+    //    cart.Add(str + str2);
+
+    using (var c = new SqliteConnection(_connectionString))
+    {
+      c.Open();
+      const string COMMAND_TEXT =
+        @"
+            CREATE TABLE IF NOT EXISTS objects(
+              hash TEXT PRIMARY KEY,
+              content TEXT
+            ) WITHOUT ROWID;
+          ";
+      using (var command = new SqliteCommand(COMMAND_TEXT, c))
+      {
+        command.ExecuteNonQuery();
+      }
+
+      // Insert Optimisations
+
+      using SqliteCommand cmd0 = new("PRAGMA journal_mode='wal';", c);
+      cmd0.ExecuteNonQuery();
+
+      //Note / Hack: This setting has the potential to corrupt the db.
+      //cmd = new SqliteCommand("PRAGMA synchronous=OFF;", Connection);
+      //cmd.ExecuteNonQuery();
+
+      using SqliteCommand cmd1 = new("PRAGMA count_changes=OFF;", c);
+      cmd1.ExecuteNonQuery();
+
+      using SqliteCommand cmd2 = new("PRAGMA temp_store=MEMORY;", c);
+      cmd2.ExecuteNonQuery();
+    }
+
+    Connection = new SqliteConnection(_connectionString);
+    Connection.Open();
+  }
+
+  /// <summary>
+  /// Returns all the objects in the store. Note: do not use for large collections.
+  /// </summary>
+  /// <returns></returns>
+  /// <remarks>This function uses a separate <see cref="SqliteConnection"/> so is safe to call concurrently (unlike most other transport functions)</remarks>
+  internal IEnumerable<string> GetAllObjects()
+  {
+    CancellationToken.ThrowIfCancellationRequested();
+
+    using SqliteConnection connection = new(_connectionString);
+    connection.Open();
+
+    using var command = new SqliteCommand("SELECT * FROM objects", connection);
+
+    using var reader = command.ExecuteReader();
+    while (reader.Read())
+    {
+      CancellationToken.ThrowIfCancellationRequested();
+      yield return reader.GetString(1);
+    }
+  }
+
+  /// <summary>
+  /// Deletes an object. Note: do not use for any speckle object transport, as it will corrupt the database.
+  /// </summary>
+  /// <param name="hash"></param>
+  public void DeleteObject(string hash)
+  {
+    CancellationToken.ThrowIfCancellationRequested();
+
+    using var command = new SqliteCommand("DELETE FROM objects WHERE hash = @hash", Connection);
+    command.Parameters.AddWithValue("@hash", hash);
+    command.ExecuteNonQuery();
+  }
+
+  /// <summary>
+  /// Updates an object.
+  /// </summary>
+  /// <param name="hash"></param>
+  /// <param name="serializedObject"></param>
+  public void UpdateObject(string hash, string serializedObject)
+  {
+    CancellationToken.ThrowIfCancellationRequested();
+
+    using var c = new SqliteConnection(_connectionString);
+    c.Open();
+    const string COMMAND_TEXT = "REPLACE INTO objects(hash, content) VALUES(@hash, @content)";
+    using var command = new SqliteCommand(COMMAND_TEXT, c);
+    command.Parameters.AddWithValue("@hash", hash);
+    command.Parameters.AddWithValue("@content", serializedObject);
+    command.ExecuteNonQuery();
+  }
+
+  public override string ToString()
+  {
+    return $"Sqlite Transport @{_rootPath}";
+  }
+
+  #region Writes
+
+  /// <summary>
+  /// Awaits untill write completion (ie, the current queue is fully consumed).
+  /// </summary>
+  /// <returns></returns>
+  public async Task WriteComplete() =>
+    await Utilities.WaitUntil(() => WriteCompletionStatus, 500).ConfigureAwait(false);
+
+  /// <summary>
+  /// Returns true if the current write queue is empty and comitted.
+  /// </summary>
+  /// <returns></returns>
+  public bool WriteCompletionStatus => _queue.IsEmpty && !_isWriting;
+
+  private void WriteTimerElapsed(object? sender, ElapsedEventArgs e)
+  {
+    _writeTimer.Enabled = false;
+
+    if (CancellationToken.IsCancellationRequested)
+    {
+      _queue = new ConcurrentQueue<(string, string, int)>();
+      return;
+    }
+
+    if (!_isWriting && !_queue.IsEmpty)
+    {
+      ConsumeQueue();
+    }
+  }
+
+  private void ConsumeQueue()
+  {
+    var stopwatch = Stopwatch.StartNew();
+    _isWriting = true;
+    try
+    {
+      CancellationToken.ThrowIfCancellationRequested();
+
+      var i = 0; //BUG: This never gets incremented!
+
+      var saved = 0;
+
+      using (var c = new SqliteConnection(_connectionString))
+      {
+        c.Open();
+        using var t = c.BeginTransaction();
+        const string COMMAND_TEXT = "INSERT OR IGNORE INTO objects(hash, content) VALUES(@hash, @content)";
+
+        while (i < MAX_TRANSACTION_SIZE && _queue.TryPeek(out var result))
+        {
+          using var command = new SqliteCommand(COMMAND_TEXT, c, t);
+          _queue.TryDequeue(out result);
+          command.Parameters.AddWithValue("@hash", result.id);
+          command.Parameters.AddWithValue("@content", result.serializedObject);
+          command.ExecuteNonQuery();
+
+          saved++;
+        }
+
+        t.Commit();
+        CancellationToken.ThrowIfCancellationRequested();
+      }
+
+      CancellationToken.ThrowIfCancellationRequested();
+
+      if (!_queue.IsEmpty)
+      {
+        ConsumeQueue();
+      }
+    }
+    catch (SqliteException ex)
+    {
+      throw new TransportException(this, "SQLite Command Failed", ex);
+    }
+    catch (OperationCanceledException)
+    {
+      _queue = new();
+    }
+    finally
+    {
+      stopwatch.Stop();
+      Elapsed += stopwatch.Elapsed;
+      _isWriting = false;
+    }
+  }
+
+  /// <summary>
+  /// Adds an object to the saving queue.
+  /// </summary>
+  /// <param name="id"></param>
+  /// <param name="serializedObject"></param>
+  public void SaveObject(string id, string serializedObject)
+  {
+    CancellationToken.ThrowIfCancellationRequested();
+    _queue.Enqueue((id, serializedObject, Encoding.UTF8.GetByteCount(serializedObject)));
+
+    _writeTimer.Enabled = true;
+    _writeTimer.Start();
+  }
+
+  /// <summary>
+  /// Directly saves the object in the db.
+  /// </summary>
+  /// <param name="hash"></param>
+  /// <param name="serializedObject"></param>
+  public void SaveObjectSync(string hash, string serializedObject)
+  {
+    const string COMMAND_TEXT = "INSERT OR IGNORE INTO objects(hash, content) VALUES(@hash, @content)";
+
+    try
+    {
+      using var command = new SqliteCommand(COMMAND_TEXT, Connection);
+      command.Parameters.AddWithValue("@hash", hash);
+      command.Parameters.AddWithValue("@content", serializedObject);
+      command.ExecuteNonQuery();
+    }
+    catch (SqliteException ex)
+    {
+      throw new TransportException(this, "SQLite Command Failed", ex);
+    }
+  }
+
+  #endregion
+
+  #region Reads
+
+  /// <summary>
+  /// Gets an object.
+  /// </summary>
+  /// <param name="id"></param>
+  /// <returns></returns>
+  public async Task<string?> GetObject(string id)
+  {
+    CancellationToken.ThrowIfCancellationRequested();
+    await _connectionLock.WaitAsync(CancellationToken).ConfigureAwait(false);
+    var startTime = Stopwatch.GetTimestamp();
+    try
+    {
+      using var command = new SqliteCommand("SELECT * FROM objects WHERE hash = @hash LIMIT 1 ", Connection);
+      command.Parameters.AddWithValue("@hash", id);
+      using var reader = command.ExecuteReader();
+      if (reader.Read())
+      {
+        return reader.GetString(1);
+      }
+    }
+    finally
+    {
+      Elapsed += LoggingHelpers.GetElapsedTime(startTime, Stopwatch.GetTimestamp());
+      _connectionLock.Release();
+    }
+    return null; // pass on the duty of null checks to consumers
+  }
+
+  public async Task<string> CopyObjectAndChildren(string id, ITransport targetTransport)
+  {
+    string res = await TransportHelpers
+      .CopyObjectAndChildrenAsync(id, this, targetTransport, CancellationToken)
+      .ConfigureAwait(false);
+    return res;
+  }
+
+  #endregion
+}