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Æsh (Another Extendable SHell) Terminal SSH
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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2017 Red Hat Inc. and/or its affiliates and other contributors
 * as indicated by the @authors tag. All rights reserved.
 * See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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 org.aesh.terminal.ssh.netty;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelPromise;
import org.apache.sshd.common.future.CloseFuture;
import org.apache.sshd.common.future.DefaultCloseFuture;
import org.apache.sshd.common.io.IoHandler;
import org.apache.sshd.common.io.IoService;
import org.apache.sshd.common.io.IoSession;
import org.apache.sshd.common.io.IoWriteFuture;
import org.apache.sshd.common.util.CloseableUtils;
import org.apache.sshd.common.util.buffer.Buffer;
import org.apache.sshd.common.util.buffer.ByteArrayBuffer;

import java.net.SocketAddress;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * @author Julien Viet
 */
public class NettyIoSession extends CloseableUtils.AbstractCloseable implements IoSession {

    private final Map attributes = new HashMap<>();
    private final NettyIoAcceptor acceptor;
    private final IoHandler handler;
    private ChannelHandlerContext context;
    private SocketAddress remoteAddr;
    private ChannelFuture prev;
    private final DefaultCloseFuture closeFuture = new DefaultCloseFuture(null);
    private final long id;

    private static final Logger LOGGER = Logger.getLogger(NettyIoSession.class.getName());

    public NettyIoSession(NettyIoAcceptor acceptor, IoHandler handler) {
        this.acceptor = acceptor;
        this.handler = handler;
        this.id = acceptor.ioService.sessionSeq.incrementAndGet();
    }

    final ChannelInboundHandlerAdapter adapter = new ChannelInboundHandlerAdapter() {
        @Override
        public void channelActive(ChannelHandlerContext ctx) throws Exception {
            context = ctx;
            acceptor.channelGroup.add(ctx.channel());
            acceptor.ioService.sessions.put(id, NettyIoSession.this);
            prev = context.newPromise().setSuccess();
            remoteAddr = context.channel().remoteAddress();
            acceptor.factory.handlerBridge.sessionCreated(handler, NettyIoSession.this);
        }

        @Override
        public void channelInactive(ChannelHandlerContext ctx) throws Exception {
            acceptor.ioService.sessions.remove(id);
            acceptor.factory.handlerBridge.sessionClosed(handler, NettyIoSession.this);
            context = null;
        }

        @Override
        public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
            ByteBuf buf = (ByteBuf) msg;
            byte[] bytes = new byte[buf.readableBytes()];
            buf.getBytes(0, bytes);
            acceptor.factory.handlerBridge.messageReceived(handler, NettyIoSession.this, new ByteArrayBuffer(bytes));
        }

        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
            LOGGER.log(Level.WARNING, "exception during io, closing.", cause);
            ctx.close();
        }
    };

    public void execute(Runnable task) {
        context.channel().eventLoop().execute(task);
    }

    public void schedule(Runnable task, long delay, TimeUnit unit) {
        context.channel().eventLoop().schedule(task, delay, unit);
    }

    @Override
    public long getId() {
        return id;
    }

    @Override
    public Object getAttribute(Object key) {
        return attributes.get(key);
    }

    @Override
    public Object setAttribute(Object key, Object value) {
        return attributes.put(key, value);
    }

    @Override
    public SocketAddress getRemoteAddress() {
        return remoteAddr;
    }

    @Override
    public SocketAddress getLocalAddress() {
        return context.channel().localAddress();
    }

    @Override
    public IoWriteFuture write(Buffer buffer) {
        ByteBuf buf = Unpooled.buffer(buffer.available());
        buf.writeBytes(buffer.array(), buffer.rpos(), buffer.available());
        NettyIoWriteFuture msg = new NettyIoWriteFuture();
        ChannelPromise next = context.newPromise();
        prev.addListener(whatever -> {
            if (context != null) {
                context.writeAndFlush(buf, next);
            }
        });
        prev = next;
        next.addListener(fut -> {
            if (fut.isSuccess()) {
                msg.setValue(Boolean.TRUE);
            } else {
                msg.setValue(fut.cause());
            }
        });
        return msg;
    }

    @Override
    public IoService getService() {
        return acceptor.ioService;
    }

    @Override
    protected CloseFuture doCloseGracefully() {
        context.
                writeAndFlush(Unpooled.EMPTY_BUFFER).
                addListener(ChannelFutureListener.CLOSE).
                addListener(fut -> {
                    closeFuture.setClosed();
                });
        return closeFuture;
    }

    @Override
    protected void doCloseImmediately() {
        context.close();
        super.doCloseImmediately();
    }
}