MQTTnet/Source/MQTTnet.Extensions.WebSocket4Net/WebSocket4NetMqttClientAdapterFactory.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using MQTTnet.Adapter;
using MQTTnet.Client;
using MQTTnet.Diagnostics;
using MQTTnet.Formatter;
using MQTTnet.Implementations;

namespace MQTTnet.Extensions.WebSocket4Net
{
    public sealed class WebSocket4NetMqttClientAdapterFactory : IMqttClientAdapterFactory
    {
        public IMqttChannelAdapter CreateClientAdapter(MqttClientOptions options, MqttPacketInspector packetInspector, IMqttNetLogger logger)
        {
            if (options == null)
            {
                throw new ArgumentNullException(nameof(options));
            }

            switch (options.ChannelOptions)
            {
                case MqttClientTcpOptions _:
                {
                    return new MqttChannelAdapter(
                        new MqttTcpChannel(options),
                        new MqttPacketFormatterAdapter(options.ProtocolVersion, new MqttBufferWriter(options.WriterBufferSize, options.WriterBufferSizeMax)),
                        logger)
                    {
                        PacketInspector = packetInspector
                    };
                }

                case MqttClientWebSocketOptions webSocketOptions:
                {
                    return new MqttChannelAdapter(
                        new WebSocket4NetMqttChannel(options, webSocketOptions),
                        new MqttPacketFormatterAdapter(options.ProtocolVersion, new MqttBufferWriter(options.WriterBufferSize, options.WriterBufferSizeMax)),
                        logger)
                    {
                        PacketInspector = packetInspector
                    };
                }

                default:
                {
                    throw new NotSupportedException();
                }
            }
        }
    }
}