io.github.liuruinian.uid.utils.DockerUtils Maven / Gradle / Ivy
/*
* Copyright (c) 2017 Baidu, Inc. All Rights Reserve.
*
* Licensed 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 io.github.liuruinian.uid.utils;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* DockerUtils
*
* @author yutianbao
*/
public abstract class DockerUtils {
private static final Logger LOGGER = LoggerFactory.getLogger(DockerUtils.class);
/** Environment param keys */
private static final String ENV_KEY_HOST = "JPAAS_HOST";
private static final String ENV_KEY_PORT = "JPAAS_HTTP_PORT";
private static final String ENV_KEY_PORT_ORIGINAL = "JPAAS_HOST_PORT_8080";
/** Docker host & port */
private static String DOCKER_HOST = "";
private static String DOCKER_PORT = "";
/** Whether is docker */
private static boolean IS_DOCKER;
static {
retrieveFromEnv();
}
/**
* Retrieve docker host
*
* @return empty string if not a docker
*/
public static String getDockerHost() {
return DOCKER_HOST;
}
/**
* Retrieve docker port
*
* @return empty string if not a docker
*/
public static String getDockerPort() {
return DOCKER_PORT;
}
/**
* Whether a docker
*
* @return
*/
public static boolean isDocker() {
return IS_DOCKER;
}
/**
* Retrieve host & port from environment
*/
private static void retrieveFromEnv() {
// retrieve host & port from environment
DOCKER_HOST = System.getenv(ENV_KEY_HOST);
DOCKER_PORT = System.getenv(ENV_KEY_PORT);
// not found from 'JPAAS_HTTP_PORT', then try to find from 'JPAAS_HOST_PORT_8080'
if (StringUtils.isBlank(DOCKER_PORT)) {
DOCKER_PORT = System.getenv(ENV_KEY_PORT_ORIGINAL);
}
boolean hasEnvHost = StringUtils.isNotBlank(DOCKER_HOST);
boolean hasEnvPort = StringUtils.isNotBlank(DOCKER_PORT);
// docker can find both host & port from environment
if (hasEnvHost && hasEnvPort) {
IS_DOCKER = true;
// found nothing means not a docker, maybe an actual machine
} else if (!hasEnvHost && !hasEnvPort) {
IS_DOCKER = false;
} else {
LOGGER.error("Missing host or port from env for Docker. host:{}, port:{}", DOCKER_HOST, DOCKER_PORT);
throw new RuntimeException(
"Missing host or port from env for Docker. ");
}
}
}