org.apache.hadoop.hdfsproxy.HdfsProxy.java Source code

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Here is the source code for org.apache.hadoop.hdfsproxy.HdfsProxy.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.hadoop.hdfsproxy;

import org.apache.hadoop.hdfs.server.namenode.JspHelper;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.util.StringUtils;

import java.io.IOException;
import java.net.InetSocketAddress;

/**
 * A HTTPS/SSL proxy to HDFS, implementing certificate based access control.
 */
public class HdfsProxy {
    public static final Log LOG = LogFactory.getLog(HdfsProxy.class);

    private ProxyHttpServer server;
    private InetSocketAddress sslAddr;

    /** Construct a proxy from the given configuration */
    public HdfsProxy(Configuration conf) throws IOException {
        try {
            initialize(conf);
        } catch (IOException e) {
            this.stop();
            throw e;
        }
    }

    private void initialize(Configuration conf) throws IOException {
        sslAddr = getSslAddr(conf);
        String nn = conf.get("hdfsproxy.dfs.namenode.address");
        if (nn == null)
            throw new IOException("HDFS NameNode address is not specified");
        InetSocketAddress nnAddr = NetUtils.createSocketAddr(nn);
        LOG.info("HDFS NameNode is at: " + nnAddr.getHostName() + ":" + nnAddr.getPort());

        Configuration sslConf = new Configuration(false);
        sslConf.addResource(conf.get("hdfsproxy.https.server.keystore.resource", "ssl-server.xml"));
        // unit testing
        sslConf.set("proxy.http.test.listener.addr", conf.get("proxy.http.test.listener.addr"));

        this.server = new ProxyHttpServer(sslAddr, sslConf);
        this.server.setAttribute("proxy.https.port", server.getPort());
        this.server.setAttribute("name.node.address", nnAddr);
        this.server.setAttribute(JspHelper.CURRENT_CONF, new Configuration());
        this.server.addGlobalFilter("ProxyFilter", ProxyFilter.class.getName(), null);
        this.server.addServlet("listPaths", "/listPaths/*", ProxyListPathsServlet.class);
        this.server.addServlet("data", "/data/*", ProxyFileDataServlet.class);
        this.server.addServlet("streamFile", "/streamFile/*", ProxyStreamFile.class);
    }

    /** return the http port if any, only for testing purposes */
    int getPort() throws IOException {
        return server.getPort();
    }

    /**
     * Start the server.
     */
    public void start() throws IOException {
        this.server.start();
        LOG.info("HdfsProxy server up at: " + sslAddr.getHostName() + ":" + sslAddr.getPort());
    }

    /**
     * Stop all server threads and wait for all to finish.
     */
    public void stop() {
        try {
            if (server != null) {
                server.stop();
                server.join();
            }
        } catch (Exception e) {
            LOG.warn("Got exception shutting down proxy", e);
        }
    }

    /**
     * Wait for service to finish.
     * (Normally, it runs forever.)
     */
    public void join() {
        try {
            this.server.join();
        } catch (InterruptedException ie) {
        }
    }

    static InetSocketAddress getSslAddr(Configuration conf) throws IOException {
        String addr = conf.get("hdfsproxy.https.address");
        if (addr == null)
            throw new IOException("HdfsProxy address is not specified");
        return NetUtils.createSocketAddr(addr);
    }

    public static HdfsProxy createHdfsProxy(String argv[], Configuration conf) throws IOException {
        if (argv.length > 0) {
            System.err.println("Usage: HdfsProxy");
            return null;
        }
        if (conf == null) {
            conf = new Configuration(false);
            conf.addResource("hdfsproxy-default.xml");
        }

        StringUtils.startupShutdownMessage(HdfsProxy.class, argv, LOG);
        HdfsProxy proxy = new HdfsProxy(conf);
        proxy.start();
        return proxy;
    }

    public static void main(String[] argv) throws Exception {
        try {
            HdfsProxy proxy = createHdfsProxy(argv, null);
            if (proxy != null)
                proxy.join();
        } catch (Throwable e) {
            LOG.error(StringUtils.stringifyException(e));
            System.exit(-1);
        }
    }
}