com.jkoolcloud.jesl.net.socket.SocketClient.java Source code

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Here is the source code for com.jkoolcloud.jesl.net.socket.SocketClient.java

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/*
 * Copyright 2015 JKOOL, LLC.
 *
 * 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 com.jkoolcloud.jesl.net.socket;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.Socket;
import java.net.URI;
import java.net.URISyntaxException;

import javax.net.SocketFactory;
import javax.net.ssl.SSLSocketFactory;

import org.apache.commons.lang3.StringUtils;

import com.jkoolcloud.jesl.net.JKStream;
import com.jkoolcloud.jesl.net.security.AuthUtils;
import com.jkoolcloud.tnt4j.core.OpLevel;
import com.jkoolcloud.tnt4j.sink.DefaultEventSinkFactory;
import com.jkoolcloud.tnt4j.sink.EventSink;

/**
 * This class provides TCP/SSL connection to the specified JESK server based on given URL.
 * tcp[s]://host:port
 *
 * @version $Revision: 3 $
 */
public class SocketClient implements JKStream {
    protected EventSink logger;

    protected InetSocketAddress proxyAddr;
    protected Proxy proxy = Proxy.NO_PROXY; // default to direct connection

    protected String host;
    protected int port;
    protected boolean secure;
    protected Socket socket;
    protected DataOutputStream out;
    protected BufferedReader in;

    /**
     * Create JESL HTTP[S} client stream with given attributes
     * 
     * @param host JESL host server
     * @param port JESL host port number
     * @param secure use SSL if secure, standard sockets if false
     * @param logger event sink used for logging, null if none
     * 
     */
    public SocketClient(String host, int port, boolean secure, EventSink logger) {
        this.host = host;
        this.port = port;
        this.secure = secure;
        this.logger = (logger != null ? logger : DefaultEventSinkFactory.defaultEventSink(SocketClient.class));
    }

    /**
     * Create JESL HTTP[S} client stream with given attributes
     * 
     * @param host JESL host server
     * @param port JESL host port number
     * @param secure use SSL if secure, standard sockets if false
     * @param proxyHost proxy host name if any, null if none
     * @param proxyPort proxy port number if any, 0 of none
     * @param logger event sink used for logging, null if none
     * 
     */
    public SocketClient(String host, int port, boolean secure, String proxyHost, int proxyPort, EventSink logger) {
        this(host, port, secure, logger);
        if (!StringUtils.isEmpty(proxyHost)) {
            proxyAddr = new InetSocketAddress(proxyHost, proxyPort);
            proxy = new Proxy(Proxy.Type.SOCKS, proxyAddr);
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public synchronized void connect() throws IOException {
        if (isConnected())
            return;
        if (secure) {
            SocketFactory socketFactory = SSLSocketFactory.getDefault();
            socket = socketFactory.createSocket(host, port);
        } else {
            socket = new Socket(host, port);
        }
        out = new DataOutputStream(socket.getOutputStream());
        in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public synchronized void connect(String token) throws IOException {
        connect();
        if (!StringUtils.isEmpty(token)) {
            logger.log(OpLevel.DEBUG, "Authenticating connection={0} with token={1}", this, token);
            AuthUtils.authenticate(this, token);
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public synchronized void send(String msg, boolean wantResponse) throws IOException {
        if (wantResponse)
            throw new UnsupportedOperationException("Responses are not supported for TCP connections");

        String lineMsg = msg.endsWith("\n") ? msg : msg + "\n";
        byte[] bytes = lineMsg.getBytes();
        out.write(bytes, 0, bytes.length);
        out.flush();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public synchronized void close() {
        try {
            if (socket != null) {
                if (out != null)
                    out.close();
                if (in != null)
                    in.close();
                socket.close();
            }
        } catch (IOException e) {
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String getHost() {
        return host;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int getPort() {
        return port;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isSecure() {
        return secure;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String getProxyHost() {
        return (proxyAddr != null ? proxyAddr.getHostName() : null);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int getProxyPort() {
        return (proxyAddr != null ? proxyAddr.getPort() : 0);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isConnected() {
        return (socket != null && socket.isConnected());
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public synchronized String read() throws IOException {
        if (socket == null)
            connect();
        return in.readLine();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        return "tcp" + (isSecure() ? "s" : "") + "://" + host + ":" + port;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public URI getURI() {
        try {
            return new URI("tcp" + (isSecure() ? "s" : "") + "://" + host + ":" + port);
        } catch (URISyntaxException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }
}