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Reactor Netty RSocket transport implementations (TCP, Websocket)
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/*
 * Copyright 2015-2018 the original author or authors.
 *
 * Licensed 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.
 */

package io.rsocket.transport.netty.server;

import io.netty.buffer.ByteBufAllocator;
import io.rsocket.DuplexConnection;
import io.rsocket.fragmentation.FragmentationDuplexConnection;
import io.rsocket.transport.ClientTransport;
import io.rsocket.transport.ServerTransport;
import io.rsocket.transport.netty.RSocketLengthCodec;
import io.rsocket.transport.netty.TcpDuplexConnection;
import java.net.InetSocketAddress;
import java.util.Objects;
import reactor.core.publisher.Mono;
import reactor.netty.tcp.TcpServer;

/**
 * An implementation of {@link ServerTransport} that connects to a {@link ClientTransport} via TCP.
 */
public final class TcpServerTransport implements ServerTransport {

  private final TcpServer server;

  private TcpServerTransport(TcpServer server) {
    this.server = server;
  }

  /**
   * Creates a new instance binding to localhost
   *
   * @param port the port to bind to
   * @return a new instance
   */
  public static TcpServerTransport create(int port) {
    TcpServer server = TcpServer.create().port(port);
    return create(server);
  }

  /**
   * Creates a new instance
   *
   * @param bindAddress the address to bind to
   * @param port the port to bind to
   * @return a new instance
   * @throws NullPointerException if {@code bindAddress} is {@code null}
   */
  public static TcpServerTransport create(String bindAddress, int port) {
    Objects.requireNonNull(bindAddress, "bindAddress must not be null");

    TcpServer server = TcpServer.create().host(bindAddress).port(port);
    return create(server);
  }

  /**
   * Creates a new instance
   *
   * @param address the address to bind to
   * @return a new instance
   * @throws NullPointerException if {@code address} is {@code null}
   */
  public static TcpServerTransport create(InetSocketAddress address) {
    Objects.requireNonNull(address, "address must not be null");

    return create(address.getHostName(), address.getPort());
  }

  /**
   * Creates a new instance
   *
   * @param server the {@link TcpServer} to use
   * @return a new instance
   * @throws NullPointerException if {@code server} is {@code null}
   */
  public static TcpServerTransport create(TcpServer server) {
    Objects.requireNonNull(server, "server must not be null");

    return new TcpServerTransport(server);
  }

  @Override
  public Mono start(ConnectionAcceptor acceptor, int mtu) {
    Objects.requireNonNull(acceptor, "acceptor must not be null");
    Mono isError = FragmentationDuplexConnection.checkMtu(mtu);
    return isError != null
        ? isError
        : server
            .doOnConnection(
                c -> {
                  c.addHandlerLast(new RSocketLengthCodec());
                  DuplexConnection connection;
                  if (mtu > 0) {
                    connection =
                        new FragmentationDuplexConnection(
                            new TcpDuplexConnection(c, false),
                            ByteBufAllocator.DEFAULT,
                            mtu,
                            true,
                            "server");
                  } else {
                    connection = new TcpDuplexConnection(c);
                  }
                  acceptor
                      .apply(connection)
                      .then(Mono.never())
                      .subscribe(c.disposeSubscriber());
                })
            .bind()
            .map(CloseableChannel::new);
  }
}