org.apache.zeppelin.python.PythonUtils.java Source code

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Here is the source code for org.apache.zeppelin.python.PythonUtils.java

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/*
 * 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.
 */

package org.apache.zeppelin.python;

import org.apache.commons.codec.binary.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import py4j.GatewayServer;

import java.io.IOException;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.SecureRandom;
import java.util.List;
import java.util.Properties;

public class PythonUtils {

    private static final Logger LOGGER = LoggerFactory.getLogger(PythonUtils.class);

    public static GatewayServer createGatewayServer(Object entryPoint, String serverAddress, int port,
            String secretKey, boolean useAuth) throws IOException {
        LOGGER.info("Launching GatewayServer at " + serverAddress + ":" + port + ", useAuth: " + useAuth);
        if (useAuth) {
            try {
                Class clz = Class.forName("py4j.GatewayServer$GatewayServerBuilder", true,
                        Thread.currentThread().getContextClassLoader());
                Object builder = clz.getConstructor(Object.class).newInstance(entryPoint);
                builder.getClass().getMethod("authToken", String.class).invoke(builder, secretKey);
                builder.getClass().getMethod("javaPort", int.class).invoke(builder, port);
                builder.getClass().getMethod("javaAddress", InetAddress.class).invoke(builder,
                        InetAddress.getByName(serverAddress));
                builder.getClass().getMethod("callbackClient", int.class, InetAddress.class, String.class)
                        .invoke(builder, port, InetAddress.getByName(serverAddress), secretKey);
                return (GatewayServer) builder.getClass().getMethod("build").invoke(builder);
            } catch (Exception e) {
                throw new IOException(e);
            }
        } else {
            return new GatewayServer(entryPoint, port, GatewayServer.DEFAULT_PYTHON_PORT,
                    InetAddress.getByName(serverAddress), InetAddress.getByName(serverAddress),
                    GatewayServer.DEFAULT_CONNECT_TIMEOUT, GatewayServer.DEFAULT_READ_TIMEOUT, (List) null);
        }
    }

    public static String getLocalIP(Properties properties) {
        // zeppelin.python.gatewayserver_address is only for unit test on travis.
        // Because the FQDN would fail unit test on travis ci.
        String gatewayserver_address = properties.getProperty("zeppelin.python.gatewayserver_address");
        if (gatewayserver_address != null) {
            return gatewayserver_address;
        }

        try {
            return Inet4Address.getLocalHost().getHostAddress();
        } catch (UnknownHostException e) {
            LOGGER.warn("can't get local IP", e);
        }
        // fall back to loopback addreess
        return "127.0.0.1";
    }

    public static String createSecret(int secretBitLength) {
        SecureRandom rnd = new SecureRandom();
        byte[] secretBytes = new byte[secretBitLength / java.lang.Byte.SIZE];
        rnd.nextBytes(secretBytes);
        return Base64.encodeBase64String(secretBytes);
    }
}