org.apache.hadoop.hive.ql.processors.DfsProcessor.java Source code

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Here is the source code for org.apache.hadoop.hive.ql.processors.DfsProcessor.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.hive.ql.processors;

import java.io.PrintStream;
import java.util.Arrays;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FsShell;
import org.apache.hadoop.hive.metastore.api.FieldSchema;
import org.apache.hadoop.hive.metastore.api.Schema;
import org.apache.hadoop.hive.ql.parse.VariableSubstitution;
import org.apache.hadoop.hive.ql.security.authorization.plugin.HiveOperationType;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.hadoop.hive.ql.session.SessionState.LogHelper;

/**
 * DfsProcessor.
 *
 */
public class DfsProcessor implements CommandProcessor {

    public static final Log LOG = LogFactory.getLog(DfsProcessor.class.getName());
    public static final LogHelper console = new LogHelper(LOG);
    public static final String DFS_RESULT_HEADER = "DFS Output";

    private final FsShell dfs;
    private final Schema dfsSchema;

    public DfsProcessor(Configuration conf) {
        this(conf, false);
    }

    public DfsProcessor(Configuration conf, boolean addSchema) {
        dfs = new FsShell(conf);
        dfsSchema = new Schema();
        dfsSchema.addToFieldSchemas(new FieldSchema(DFS_RESULT_HEADER, "string", ""));
    }

    @Override
    public void init() {
    }

    @Override
    public CommandProcessorResponse run(String command) {

        try {
            SessionState ss = SessionState.get();
            command = new VariableSubstitution().substitute(ss.getConf(), command);

            String[] tokens = command.split("\\s+");
            CommandProcessorResponse authErrResp = CommandUtil.authorizeCommand(ss, HiveOperationType.DFS,
                    Arrays.asList(tokens));
            if (authErrResp != null) {
                // there was an authorization issue
                return authErrResp;
            }

            PrintStream oldOut = System.out;

            if (ss != null && ss.out != null) {
                System.setOut(ss.out);
            }

            int ret = dfs.run(tokens);
            if (ret != 0) {
                console.printError("Command failed with exit code = " + ret);
            }

            System.setOut(oldOut);
            return new CommandProcessorResponse(ret, null, null, dfsSchema);

        } catch (Exception e) {
            console.printError("Exception raised from DFSShell.run " + e.getLocalizedMessage(),
                    org.apache.hadoop.util.StringUtils.stringifyException(e));
            return new CommandProcessorResponse(1);
        }
    }

}