DockerMachineClient.java

package org.testcontainers.utility;

import lombok.NonNull;

import org.apache.commons.lang.SystemUtils;
import org.slf4j.Logger;

import java.util.List;
import java.util.Optional;

import static java.util.Arrays.asList;
import static org.slf4j.LoggerFactory.getLogger;
import static org.testcontainers.utility.CommandLine.executableExists;
import static org.testcontainers.utility.CommandLine.runShellCommand;

/**
 * Created by rnorth on 27/10/2015.
 */
public class DockerMachineClient {

    private static DockerMachineClient instance;
    private static final Logger LOGGER = getLogger(DockerMachineClient.class);

    private static final String executableName;
    static {
    	if(SystemUtils.IS_OS_WINDOWS) {
    		executableName = "docker-machine.exe";
    	} else {
    		executableName = "docker-machine";
    	}
    }

    /**
     * Private constructor
     */
    private DockerMachineClient() {
    }

    /**
     * Obtain an instance of the DockerMachineClient wrapper.
     *
     * @return the singleton instance of DockerMachineClient
     */
    public synchronized static DockerMachineClient instance() {
        if (instance == null) {
            instance = new DockerMachineClient();
        }

        return instance;
    }

    public boolean isInstalled() {
        return executableExists(executableName);
    }

    public Optional<String> getDefaultMachine() {
        String ls = runShellCommand(executableName, "ls", "-q");
        List<String> machineNames = asList(ls.split("\n"));

        String envMachineName = System.getenv("DOCKER_MACHINE_NAME");

        if (machineNames.contains(envMachineName)) {
            LOGGER.debug("Using docker-machine set in DOCKER_MACHINE_NAME: {}", envMachineName);
            return Optional.of(envMachineName);
        } else if (machineNames.contains("default")) {
            LOGGER.debug("DOCKER_MACHINE_NAME is not set; Using 'default' docker-machine", envMachineName);
            return Optional.of("default");
        } else if (machineNames.size() > 0) {
            LOGGER.debug("DOCKER_MACHINE_NAME is not set and no machine named 'default' found; Using first machine found with `docker-machine ls`: {}", machineNames.get(0));
            return Optional.of(machineNames.get(0));
        } else {
            return Optional.empty();
        }
    }

    public void ensureMachineRunning(@NonNull String machineName) {
        if (!isMachineRunning(machineName)) {
            LOGGER.info("Docker-machine '{}' is not running. Will start it now", machineName);
            runShellCommand("docker-machine", "start", machineName);
        }
    }

    public String getDockerDaemonIpAddress(@NonNull String machineName) {
        return runShellCommand(executableName, "ip", machineName);
    }

    public boolean isMachineRunning(String machineName) {
        String status = runShellCommand("docker-machine", "status", machineName);
        return status.trim().equalsIgnoreCase("running");
    }

    public boolean isDefaultMachineRunning() {
        return isMachineRunning(getDefaultMachine().orElse("default"));
    }
}