com.vmware.photon.controller.clustermanager.templates.ZookeeperNodeTemplate.java Source code

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Here is the source code for com.vmware.photon.controller.clustermanager.templates.ZookeeperNodeTemplate.java

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/*
 * Copyright 2015 VMware, Inc. All Rights Reserved.
 *
 * 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 com.vmware.photon.controller.clustermanager.templates;

import com.vmware.photon.controller.clustermanager.servicedocuments.FileTemplate;

import com.google.common.base.Preconditions;
import org.apache.commons.net.util.SubnetUtils;

import java.nio.file.Paths;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Defines the template for Zookeeper Nodes.
 */
public class ZookeeperNodeTemplate implements NodeTemplate {

    public static final String ZOOKEEPER_USER_DATA_TEMPLATE = "zookeeper-user-data.template";
    public static final String DNS_PROPERTY = "dns";
    public static final String GATEWAY_PROPERTY = "gateway";
    public static final String NETMASK_PROPERTY = "netmask";
    public static final String ZOOKEEPER_IPS_PROPERTY = "zookeeperIps";
    public static final String VM_NAME_PREFIX = "zookeeper";

    public String getVmName(Map<String, String> properties) {
        Preconditions.checkNotNull(properties, "properties cannot be null");

        String hostId = properties.get(NodeTemplateUtils.HOST_ID_PROPERTY);
        return NodeTemplateUtils.generateHostName(VM_NAME_PREFIX, hostId);
    }

    public FileTemplate createUserDataTemplate(String scriptDirectory, Map<String, String> properties) {
        Preconditions.checkNotNull(scriptDirectory, "scriptDirectory cannot be null");
        Preconditions.checkNotNull(properties, "properties cannot be null");

        String dns = properties.get(DNS_PROPERTY);
        String gateway = properties.get(GATEWAY_PROPERTY);
        String netmask = properties.get(NETMASK_PROPERTY);
        String nodeIndexStr = properties.get(NodeTemplateUtils.NODE_INDEX_PROPERTY);
        List<String> zookeeperIps = NodeTemplateUtils
                .deserializeAddressList(properties.get(ZOOKEEPER_IPS_PROPERTY));

        int nodeIndex = Integer.parseInt(nodeIndexStr);

        String ipAddress = zookeeperIps.get(nodeIndex);
        String cidrSignature = new SubnetUtils(ipAddress, netmask).getInfo().getCidrSignature();
        String zkParameters = createZookeeperParameters(zookeeperIps);

        Map<String, String> parameters = new HashMap();
        parameters.put("$DNS", "DNS=" + dns);
        parameters.put("$GATEWAY", gateway);
        parameters.put("$ZK_ID", Integer.toString(nodeIndex + 1));
        parameters.put("$ADDRESS", cidrSignature);
        parameters.put("$ZK_PARAMETERS", zkParameters);

        FileTemplate template = new FileTemplate();
        template.filePath = Paths.get(scriptDirectory, ZOOKEEPER_USER_DATA_TEMPLATE).toString();
        template.parameters = parameters;
        return template;
    }

    public FileTemplate createMetaDataTemplate(String scriptDirectory, Map<String, String> properties) {
        Preconditions.checkNotNull(scriptDirectory, "scriptDirectory cannot be null");
        Preconditions.checkNotNull(properties, "properties cannot be null");

        return NodeTemplateUtils.createMetaDataTemplate(scriptDirectory, getVmName(properties));
    }

    public static Map<String, String> createProperties(String dns, String gateway, String netmask,
            List<String> zkAddresses) {

        Preconditions.checkNotNull(dns, "dns cannot be null");
        Preconditions.checkNotNull(gateway, "gateway cannot be null");
        Preconditions.checkNotNull(netmask, "netmask cannot be null");
        Preconditions.checkNotNull(zkAddresses, "zkAddresses cannot be null");
        Preconditions.checkArgument(zkAddresses.size() > 0, "zkAddresses should contain at least one address");

        Map<String, String> properties = new HashMap();
        properties.put(DNS_PROPERTY, dns);
        properties.put(GATEWAY_PROPERTY, gateway);
        properties.put(NETMASK_PROPERTY, netmask);
        properties.put(ZOOKEEPER_IPS_PROPERTY, NodeTemplateUtils.serializeAddressList(zkAddresses));

        return properties;
    }

    private static String createZookeeperParameters(List<String> zookeeperIps) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < zookeeperIps.size(); i++) {
            String parameterIndex = Integer.toString(i + 1);
            sb.append("-e ADDITIONAL_ZOOKEEPER_" + parameterIndex + "=server." + parameterIndex + "="
                    + zookeeperIps.get(i) + ":2888:3888 ");
        }
        return sb.toString();
    }
}