Add multi-session tests

[lttng-ust-java-tests.git] / src / org / lttng / ust / agent / utils / TestUtils.java

package org.lttng.ust.agent.utils;

import java.io.IOException;
import java.lang.ProcessBuilder.Redirect;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.List;

import org.lttng.ust.agent.jul.LttngLogHandler;
import org.lttng.ust.agent.log4j.LttngLogAppender;
import org.lttng.ust.agent.utils.LttngSession.Domain;

/**
 * Utility methods to help with UST-Java tests
 */
public final class TestUtils {

    private TestUtils() {}

    /**
     * Check the the JUL native library is available, effectively allowing LTTng
     * JUL handlers to be used.
     *
     * @return True if JUL works fine, false if it does not.
     */
    public static boolean checkForJulLibrary() {
        try {
            LttngLogHandler testHandler = new LttngLogHandler();
            testHandler.close();
        } catch (SecurityException | IOException e) {
            return false;
        }
        return true;
    }

    /**
     * Check the the Log4j native library is available, effectively allowing
     * LTTng Log4j appenders to be used.
     *
     * @return True if Log4j works fine, false if it does not.
     */
    public static boolean checkForLog4jLibrary() {
        try {
            LttngLogAppender testAppender = new LttngLogAppender();
            testAppender.close();
        } catch (SecurityException | IOException e) {
            return false;
        }
        return true;
    }

    /**
     * Check that lttng-tools and babeltrace are installed on the system and
     * working.
     *
     * @param domain
     *            The tracing domain to test for (we will try to setup a session
     *            with this domain)
     * @return True if the environment should allow tracing fine, false if there
     *         was an error
     */
    public static boolean checkForLttngTools(Domain domain) {
        try (LttngSession session = new LttngSession(null, domain)) {
            boolean ret1 = session.enableAllEvents();
            boolean ret2 = session.start();
            boolean ret3 = session.stop();
            /*
             * "lttng view" also tests that Babeltrace is installed and working
             */
            List<String> contents = session.view();
            return (ret1 && ret2 && ret3 && contents.isEmpty());
        }
    }

    public static boolean checkForUserSessiond() {
        String userName = System.getProperty("user.name");

        /* The user name is truncated to 7 characters in "ps" */
        String shortUserName = userName.substring(0, Math.min(userName.length(), 7));

        List<String> command = Arrays.asList("ps", "-e", "u");
        List<String> output = getOutputFromCommand(false, command);
        return output.stream()
                .filter(s -> s.contains("lttng-sessiond"))
                .anyMatch(s -> s.startsWith(shortUserName));
    }

    public static boolean checkForRootSessiond() {
        List<String> command = Arrays.asList("ps", "-e", "u");
        List<String> output = getOutputFromCommand(false, command);
        return output.stream()
                .filter(s -> s.contains("lttng-sessiond"))
                .anyMatch(s -> s.startsWith("root"));
    }


    static List<String> getOutputFromCommand(List<String> command) {
        return TestUtils.getOutputFromCommand(true, command);
    }

    static List<String> getOutputFromCommand(boolean print, List<String> command) {
        try {
            Path tempFile = Files.createTempFile("test-output", null);

            ProcessBuilder builder = new ProcessBuilder(command);
            builder.redirectErrorStream(true);
            builder.redirectOutput(Redirect.to(tempFile.toFile()));

            Process p = builder.start();
            p.waitFor();

            List<String> lines = Files.readAllLines(tempFile);
            Files.delete(tempFile);

            if (print) {
                /* Also print the output to the console */
                lines.stream().forEach(s -> System.out.println(s));
            }

            return lines;

        } catch (IOException | InterruptedException e) {
            return null;
        }
    }
}