| #region License |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #endregion |
| |
| using System; |
| using System.Net.WebSockets; |
| using System.Threading; |
| using System.Threading.Tasks; |
| using Gremlin.Net.Driver.Messages; |
| using Gremlin.Net.Structure.IO; |
| using Gremlin.Net.Structure.IO.GraphBinary; |
| using Gremlin.Net.Structure.IO.GraphSON; |
| using Microsoft.Extensions.Logging; |
| using Microsoft.Extensions.Logging.Abstractions; |
| |
| namespace Gremlin.Net.Driver |
| { |
| /// <summary> |
| /// Provides a mechanism for submitting Gremlin requests to one Gremlin Server. |
| /// </summary> |
| public class GremlinClient : IGremlinClient |
| { |
| private readonly ConnectionPool _connectionPool; |
| |
| internal ILoggerFactory LoggerFactory { get; } |
| |
| /// <summary> |
| /// Initializes a new instance of the <see cref="GremlinClient" /> class for the specified Gremlin Server. |
| /// </summary> |
| /// <param name="gremlinServer">The <see cref="GremlinServer" /> the requests should be sent to.</param> |
| /// <param name="graphSONReader">A <see cref="GraphSONReader" /> instance to read received GraphSON data.</param> |
| /// <param name="graphSONWriter">a <see cref="GraphSONWriter" /> instance to write GraphSON data.</param> |
| /// <param name="connectionPoolSettings">The <see cref="ConnectionPoolSettings" /> for the connection pool.</param> |
| /// <param name="webSocketConfiguration"> |
| /// A delegate that will be invoked with the <see cref="ClientWebSocketOptions" /> |
| /// object used to configure WebSocket connections. |
| /// </param> |
| /// <param name="sessionId">The session Id if Gremlin Client in session mode, defaults to null as session-less Client.</param> |
| [Obsolete("This constructor is obsolete. Use the constructor that takes a IMessageSerializer instead.")] |
| public GremlinClient(GremlinServer gremlinServer, GraphSONReader graphSONReader, GraphSONWriter graphSONWriter, |
| ConnectionPoolSettings connectionPoolSettings = null, |
| Action<ClientWebSocketOptions> webSocketConfiguration = null, string sessionId = null) |
| : this(gremlinServer, graphSONReader, graphSONWriter, SerializationTokens.GraphSON3MimeType, |
| connectionPoolSettings, webSocketConfiguration, sessionId) |
| { |
| } |
| |
| /// <summary> |
| /// Initializes a new instance of the <see cref="GremlinClient" /> class for the specified Gremlin Server. |
| /// </summary> |
| /// <param name="gremlinServer">The <see cref="GremlinServer" /> the requests should be sent to.</param> |
| /// <param name="graphSONReader">A <see cref="GraphSONReader" /> instance to read received GraphSON data.</param> |
| /// <param name="graphSONWriter">a <see cref="GraphSONWriter" /> instance to write GraphSON data.</param> |
| /// <param name="mimeType">The GraphSON version mime type, defaults to latest supported by the server.</param> |
| /// <param name="connectionPoolSettings">The <see cref="ConnectionPoolSettings" /> for the connection pool.</param> |
| /// <param name="webSocketConfiguration"> |
| /// A delegate that will be invoked with the <see cref="ClientWebSocketOptions" /> |
| /// object used to configure WebSocket connections. |
| /// </param> |
| /// <param name="sessionId">The session Id if Gremlin Client in session mode, defaults to null as session-less Client.</param> |
| [Obsolete("This constructor is obsolete. Use the constructor that takes a IMessageSerializer instead.")] |
| public GremlinClient(GremlinServer gremlinServer, GraphSONReader graphSONReader, GraphSONWriter graphSONWriter, |
| string mimeType, ConnectionPoolSettings connectionPoolSettings = null, |
| Action<ClientWebSocketOptions> webSocketConfiguration = null, string sessionId = null) |
| { |
| IMessageSerializer messageSerializer; |
| switch (mimeType) |
| { |
| case SerializationTokens.GraphSON3MimeType: |
| VerifyGraphSONArgumentTypeForMimeType<GraphSON3Reader>(graphSONReader, nameof(graphSONReader), |
| mimeType); |
| VerifyGraphSONArgumentTypeForMimeType<GraphSON3Writer>(graphSONWriter, nameof(graphSONWriter), |
| mimeType); |
| messageSerializer = new GraphSON3MessageSerializer( |
| (GraphSON3Reader) graphSONReader ?? new GraphSON3Reader(), |
| (GraphSON3Writer) graphSONWriter ?? new GraphSON3Writer()); |
| break; |
| case SerializationTokens.GraphSON2MimeType: |
| VerifyGraphSONArgumentTypeForMimeType<GraphSON2Reader>(graphSONReader, nameof(graphSONReader), |
| mimeType); |
| VerifyGraphSONArgumentTypeForMimeType<GraphSON2Writer>(graphSONWriter, nameof(graphSONWriter), |
| mimeType); |
| messageSerializer = new GraphSON2MessageSerializer( |
| (GraphSON2Reader) graphSONReader ?? new GraphSON2Reader(), |
| (GraphSON2Writer) graphSONWriter ?? new GraphSON2Writer()); |
| break; |
| default: |
| throw new ArgumentException(nameof(mimeType), $"{mimeType} not supported"); |
| } |
| |
| var connectionFactory = |
| new ConnectionFactory(gremlinServer, messageSerializer, |
| new WebSocketSettings |
| { |
| WebSocketConfigurationCallback = webSocketConfiguration, |
| EnableUserAgentOnConnect = connectionPoolSettings?.EnableUserAgentOnConnect ?? ConnectionPoolSettings.DefaultEnableUserAgentOnConnect |
| }, sessionId); |
| |
| // make sure one connection in pool as session mode |
| if (!string.IsNullOrEmpty(sessionId)) |
| { |
| if (connectionPoolSettings != null) |
| { |
| if (connectionPoolSettings.PoolSize != 1) |
| throw new ArgumentOutOfRangeException(nameof(connectionPoolSettings), "PoolSize must be 1 in session mode!"); |
| } |
| else |
| { |
| connectionPoolSettings = new ConnectionPoolSettings {PoolSize = 1}; |
| } |
| } |
| |
| LoggerFactory = NullLoggerFactory.Instance; |
| |
| _connectionPool = new ConnectionPool(connectionFactory, |
| connectionPoolSettings ?? new ConnectionPoolSettings(), LoggerFactory.CreateLogger<ConnectionPool>()); |
| } |
| |
| private static void VerifyGraphSONArgumentTypeForMimeType<T>(object argument, string argumentName, |
| string mimeType) |
| { |
| if (argument != null && !(argument is T)) |
| { |
| throw new ArgumentException( |
| $"{argumentName} is not a {typeof(T).Name} but the mime type is: {mimeType}", argumentName); |
| } |
| } |
| |
| /// <summary> |
| /// Initializes a new instance of the <see cref="GremlinClient" /> class for the specified Gremlin Server. |
| /// </summary> |
| /// <param name="gremlinServer">The <see cref="GremlinServer" /> the requests should be sent to.</param> |
| /// <param name="messageSerializer"> |
| /// A <see cref="IMessageSerializer" /> instance to serialize messages sent to and received |
| /// from the server. |
| /// </param> |
| /// <param name="connectionPoolSettings">The <see cref="ConnectionPoolSettings" /> for the connection pool.</param> |
| /// <param name="webSocketConfiguration"> |
| /// A delegate that will be invoked with the <see cref="ClientWebSocketOptions" /> |
| /// object used to configure WebSocket connections. |
| /// </param> |
| /// <param name="sessionId">The session Id if Gremlin Client in session mode, defaults to null as session-less Client.</param> |
| /// <param name="disableCompression"> |
| /// Whether to disable compression. Compression is only supported since .NET 6. |
| /// There it is also enabled by default. |
| /// |
| /// Note that compression might make your application susceptible to attacks like CRIME/BREACH. Compression |
| /// should therefore be turned off if your application sends sensitive data to the server as well as data |
| /// that could potentially be controlled by an untrusted user. |
| /// </param> |
| /// <param name="loggerFactory">A factory to create loggers. If not provided, then nothing will be logged.</param> |
| public GremlinClient(GremlinServer gremlinServer, IMessageSerializer messageSerializer = null, |
| ConnectionPoolSettings connectionPoolSettings = null, |
| Action<ClientWebSocketOptions> webSocketConfiguration = null, string sessionId = null, |
| bool disableCompression = false, ILoggerFactory loggerFactory = null) |
| { |
| messageSerializer ??= new GraphBinaryMessageSerializer(); |
| var webSocketSettings = new WebSocketSettings |
| { |
| WebSocketConfigurationCallback = webSocketConfiguration, |
| EnableUserAgentOnConnect = connectionPoolSettings?.EnableUserAgentOnConnect ?? ConnectionPoolSettings.DefaultEnableUserAgentOnConnect |
| #if NET6_0_OR_GREATER |
| , UseCompression = !disableCompression |
| #endif |
| }; |
| var connectionFactory = |
| new ConnectionFactory(gremlinServer, messageSerializer, webSocketSettings, sessionId); |
| |
| // make sure one connection in pool as session mode |
| if (!string.IsNullOrEmpty(sessionId)) |
| { |
| if (connectionPoolSettings != null) |
| { |
| if (connectionPoolSettings.PoolSize != 1) |
| throw new ArgumentOutOfRangeException(nameof(connectionPoolSettings), |
| "PoolSize must be 1 in session mode!"); |
| } |
| else |
| { |
| connectionPoolSettings = new ConnectionPoolSettings {PoolSize = 1}; |
| } |
| } |
| |
| LoggerFactory = loggerFactory ?? NullLoggerFactory.Instance; |
| |
| _connectionPool = new ConnectionPool(connectionFactory, |
| connectionPoolSettings ?? new ConnectionPoolSettings(), LoggerFactory.CreateLogger<ConnectionPool>()); |
| } |
| |
| /// <summary> |
| /// Gets the number of open connections. |
| /// </summary> |
| public int NrConnections => _connectionPool.NrConnections; |
| |
| /// <inheritdoc /> |
| public async Task<ResultSet<T>> SubmitAsync<T>(RequestMessage requestMessage, CancellationToken cancellationToken = default) |
| { |
| using var connection = _connectionPool.GetAvailableConnection(); |
| return await connection.SubmitAsync<T>(requestMessage, cancellationToken).ConfigureAwait(false); |
| } |
| |
| #region IDisposable Support |
| |
| private bool _disposed; |
| |
| /// <inheritdoc /> |
| public void Dispose() |
| { |
| Dispose(true); |
| GC.SuppressFinalize(this); |
| } |
| |
| /// <summary> |
| /// Releases the resources used by the <see cref="GremlinClient" /> instance. |
| /// </summary> |
| /// <param name="disposing">Specifies whether managed resources should be released.</param> |
| protected virtual void Dispose(bool disposing) |
| { |
| if (!_disposed) |
| { |
| if (disposing) |
| _connectionPool?.Dispose(); |
| _disposed = true; |
| } |
| } |
| |
| #endregion |
| } |
| } |