com.cloudera.impala.testutil.SentryServicePinger.java Source code

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Here is the source code for com.cloudera.impala.testutil.SentryServicePinger.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 com.cloudera.impala.testutil;

import org.apache.commons.cli.BasicParser;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.Options;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.cloudera.impala.authorization.User;
import com.cloudera.impala.authorization.SentryConfig;
import com.cloudera.impala.util.SentryPolicyService;

/**
 * Simple class that issues a read-only RPC to the Sentry Service to check if it
 * is online. Attempts to ping the Sentry Service a user specified number of times
 * and returns a non-zero error code if the RPC never succeeds, otherwise returns
 * 0.
 */
public class SentryServicePinger {
    private final static Logger LOG = LoggerFactory.getLogger(SentryServicePinger.class);

    // Suppress warnings from OptionBuilder.
    @SuppressWarnings("static-access")
    public static void main(String[] args) throws Exception {
        // Parse command line options to get config file path.
        Options options = new Options();
        options.addOption(OptionBuilder.withLongOpt("config_file")
                .withDescription("Absolute path to a sentry-site.xml config file (string)").hasArg()
                .withArgName("CONFIG_FILE").isRequired().create('c'));
        options.addOption(OptionBuilder.withLongOpt("num_pings")
                .withDescription("Max number of pings to try before failing (int)").hasArg().isRequired()
                .withArgName("NUM_PINGS").create('n'));
        options.addOption(
                OptionBuilder.withLongOpt("sleep_secs").withDescription("Time (s) to sleep between pings (int)")
                        .hasArg().withArgName("SLEEP_SECS").create('s'));
        BasicParser optionParser = new BasicParser();
        CommandLine cmdArgs = optionParser.parse(options, args);

        SentryConfig sentryConfig = new SentryConfig(cmdArgs.getOptionValue("config_file"));
        int numPings = Integer.parseInt(cmdArgs.getOptionValue("num_pings"));
        int maxPings = numPings;
        int sleepSecs = Integer.parseInt(cmdArgs.getOptionValue("sleep_secs"));

        sentryConfig.loadConfig();
        while (numPings > 0) {
            SentryPolicyService policyService = new SentryPolicyService(sentryConfig);
            try {
                policyService.listAllRoles(new User(System.getProperty("user.name")));
                LOG.info("Sentry Service ping succeeded.");
                System.exit(0);
            } catch (Exception e) {
                LOG.error(String.format("Error issing RPC to Sentry Service (attempt %d/%d): ",
                        maxPings - numPings + 1, maxPings), e);
                Thread.sleep(sleepSecs * 1000);
            }
            --numPings;
        }
        System.exit(1);
    }
}