/*
 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */


/*
 * @test
 * @summary Ensure that certain JFR events return correct results for resource values
 *          when run inside Docker container, such as available CPU and memory.
 *          Also make sure that PIDs are based on value provided by container,
 *          not by the host system.
 * @requires (os.maxMemory >= 2g)
 * @library /testlibrary
 * @build JfrReporter
 * @run driver TestJFREvents
 */
import java.util.List;
import com.oracle.java.testlibrary.Common;
import com.oracle.java.testlibrary.DockerRunOptions;
import com.oracle.java.testlibrary.DockerTestUtils;
import com.oracle.java.testlibrary.Asserts;
import com.oracle.java.testlibrary.OutputAnalyzer;
import com.oracle.java.testlibrary.Utils;


public class TestJFREvents {
    private static final String imageName = Common.imageName("jfr-events");
    private static final String TEST_ENV_VARIABLE = "UNIQUE_VARIABLE_ABC592903XYZ";
    private static final String TEST_ENV_VALUE = "unique_value_abc592903xyz";
    private static final int availableCPUs = Runtime.getRuntime().availableProcessors();

    public static void main(String[] args) throws Exception {
        System.out.println("Test Environment: detected availableCPUs = " + availableCPUs);
        if (!DockerTestUtils.canTestDocker()) {
            return;
        }

        DockerTestUtils.buildJdkDockerImage(imageName, "Dockerfile-BasicTest", "jdk-docker");

        try {
            // leave one CPU for system and tools, otherwise this test may be unstable
            int maxNrOfAvailableCpus =  availableCPUs - 1;
            for (int i=1; i < maxNrOfAvailableCpus; i = i * 2) {
                testCPUInfo(i, i);
            }

            long MB = 1024*1024;
            testMemory("200m", "" + 200*MB);
            testMemory("500m", "" + 500*MB);
            testMemory("1g", "" + 1024*MB);

            testProcessInfo();

            testEnvironmentVariables();
        } finally {
            DockerTestUtils.removeDockerImage(imageName);
        }
    }


    private static void testCPUInfo(int valueToSet, int expectedValue) throws Exception {
        Common.logNewTestCase("CPUInfo: --cpus = " + valueToSet);
        DockerTestUtils.dockerRunJava(
                                      commonDockerOpts()
                                      .addDockerOpts("--cpus=" + valueToSet)
                                      .addClassOptions("jdk.CPUInformation"))
            .shouldHaveExitValue(0);
        // The following assertion is currently disabled due to JFR reporting incorrect values.
        // JFR reports values for the host system as opposed to values for the container.
        // @ignore 8219999
        // .shouldContain("cores = " + expectedValue");
    }


    private static void testMemory(String valueToSet, String expectedValue) throws Exception {
        Common.logNewTestCase("Memory: --memory = " + valueToSet);
        DockerTestUtils.dockerRunJava(
                                      commonDockerOpts()
                                      .addDockerOpts("--memory=" + valueToSet)
                                      .addClassOptions("jdk.PhysicalMemory"))
            .shouldHaveExitValue(0)
            .shouldContain("totalSize = " + expectedValue);
    }


    private static void testProcessInfo() throws Exception {
        Common.logNewTestCase("ProcessInfo");
        DockerTestUtils.dockerRunJava(
                                      commonDockerOpts()
                                      .addClassOptions("jdk.SystemProcess"))
            .shouldHaveExitValue(0)
            .shouldContain("pid = 1");
    }


    private static DockerRunOptions commonDockerOpts() {
        return new DockerRunOptions(imageName, "/jdk/bin/java", "JfrReporter")
            .addDockerOpts("--volume", Utils.TEST_CLASSES + ":/test-classes/")
            .addJavaOpts("-cp", "/test-classes/");
    }


    private static void testEnvironmentVariables() throws Exception {
        Common.logNewTestCase("EnvironmentVariables");

        List<String> cmd = DockerTestUtils.buildJavaCommand(
                                      commonDockerOpts()
                                      .addClassOptions("jdk.InitialEnvironmentVariable"));

        ProcessBuilder pb = new ProcessBuilder(cmd);
        // Container has JAVA_HOME defined via the Dockerfile; make sure
        // it is reported by JFR event.
        // Environment variable set in host system should not be visible inside a container,
        // and should not be reported by JFR.
        pb.environment().put(TEST_ENV_VARIABLE, TEST_ENV_VALUE);

        System.out.println("[COMMAND]\n" + Utils.getCommandLine(pb));
        OutputAnalyzer out = new OutputAnalyzer(pb.start());
        System.out.println("[STDERR]\n" + out.getStderr());
        System.out.println("[STDOUT]\n" + out.getStdout());

        out.shouldHaveExitValue(0)
            .shouldContain("key = JAVA_HOME")
            .shouldContain("value = /jdk")
            .shouldNotContain(TEST_ENV_VARIABLE)
            .shouldNotContain(TEST_ENV_VALUE);
    }
}