Github user imesh commented on a diff in the pull request:
https://github.com/apache/stratos/pull/419#discussion_r36939054
--- Diff:
extensions/load-balancer/gce-extension/src/main/java/org/apache/stratos/gce/extension/GCELoadBalancer.java
---
@@ -0,0 +1,391 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.stratos.gce.extension;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import
org.apache.stratos.gce.extension.config.GCEClusterConfigurationHolder;
+import org.apache.stratos.gce.extension.config.GCEContext;
+import org.apache.stratos.gce.extension.util.GCEOperations;
+import org.apache.stratos.load.balancer.common.domain.*;
+import org.apache.stratos.load.balancer.extension.api.LoadBalancer;
+import
org.apache.stratos.load.balancer.extension.api.exception.LoadBalancerExtensionException;
+
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+import java.util.*;
+
+public class GCELoadBalancer implements LoadBalancer {
+
+ private static final Log log =
LogFactory.getLog(GCELoadBalancer.class);
+ //PROTOCOL should be TCP or UDP
+ private static final String PROTOCOL = "TCP";
+ private GCEOperations gceOperations;
+ /**
+ * One configuration object per cluster will be created
+ * One cluster has one target pool,one forwarding rule and a health
check
+ * This hash map is used to hold cluster IDs and corresponding
configuration
+ */
+ private Map<String, GCEClusterConfigurationHolder>
clusterToLoadBalancerConfigurationMap;
+
+ public GCELoadBalancer() throws IOException, GeneralSecurityException {
+ gceOperations = new GCEOperations();
+ clusterToLoadBalancerConfigurationMap = new HashMap<String,
GCEClusterConfigurationHolder>();
+
+ }
+
+ /**
+ * Listen to latest topology and update load balancer configuration
+ *
+ * @param topology latest topology to be configured
+ * @return - true - if the load balancer was successfully configured.
else false
+ * @throws LoadBalancerExtensionException
+ */
+ @Override
+ public boolean configure(Topology topology) throws
LoadBalancerExtensionException {
+ log.info("Complete topology received. Configuring Load balancer ");
+
+ //this list is used to hold the current clusters available in
topology and which has at least one member.
+ List<String> activeClusterIdList = new ArrayList<String>();
+
+ for (Service service : topology.getServices()) {
+ for (Cluster cluster : service.getClusters()) { //for each
cluster
+
+ //check whether this cluster has a load balancer
configuration or not
+ if
(clusterToLoadBalancerConfigurationMap.containsKey(cluster.getClusterId())) {
+
+ if (log.isDebugEnabled()) {
+ log.debug("Reconfiguring the existing cluster: " +
cluster.getClusterId());
+ }
+
+ //It already has a entry in
clusterToLoadBalancerConfigurationMap.
+ //Take it and update it as the given topology.
+ GCEClusterConfigurationHolder
gceClusterConfigurationHolder = clusterToLoadBalancerConfigurationMap.
+ get(cluster.getClusterId());
+
+ //if the cluster contains at least one member
+ if (!cluster.getMembers().isEmpty()) {
+ //that cluster contains at least one member
+
+ if (log.isDebugEnabled()) {
+ log.debug("Cluster " + cluster.getClusterId()
+ " has one or more members");
+ }
+ activeClusterIdList.add(cluster.getClusterId());
+
+ //***************detect member changes and
update**************//
+
+ //check for newly created members
+ List<String> membersToBeAddedToTargetPool = new
ArrayList<String>();
+ for (Member member : cluster.getMembers()) {
+
+ if (member.getInstanceId() != null &&
!gceClusterConfigurationHolder.getMemberList().
+ contains(member.getInstanceId())) {
+ if (log.isDebugEnabled()) {
+ log.debug("New member found: " +
member.getInstanceId());
+ }
+
membersToBeAddedToTargetPool.add(member.getInstanceId());
+ }
+ }
+
+ if (!membersToBeAddedToTargetPool.isEmpty()) {
//we have new members
+ log.info("New members in cluster" +
cluster.getClusterId() + " found. Adding new members " +
+ "to cluster");
+
+ //add them to configuration holder
+ for (String memberId :
membersToBeAddedToTargetPool) {
+
gceClusterConfigurationHolder.addMember(memberId);
+
+ }
+
+ //add them to target pool too
+
gceOperations.addInstancesToTargetPool(membersToBeAddedToTargetPool,
+
gceClusterConfigurationHolder.getTargetPoolName());
+ }
+
+ //check for terminated members and remove them
from cluster
+ List<String> membersToBeRemovedFromTargetPool =
new ArrayList<String>();
+ for (String memberId :
gceClusterConfigurationHolder.getMemberList()) { //for all members in Map
+ boolean found = false;
+ for (Member member : cluster.getMembers()) {
//for all members in cluster
+ if
(member.getInstanceId().equals(memberId)) {
+ found = true;
+ break;
+ }
+ }
+ if (!found) {
+ //add member id to
membersToBeRemovedFromTargetPool in order remove member from map
+ if (log.isDebugEnabled()) {
+ log.debug("Terminated member found: "
+ memberId);
+ }
+
membersToBeRemovedFromTargetPool.add(memberId);
+ }
+ }
+
+ if (!membersToBeRemovedFromTargetPool.isEmpty()) {
//found terminated members
+ log.info("Terminated members found in cluster
" + cluster.getClusterId() + ". Removing them");
+
+ //remove them from configuration holder
+ for (String memberId :
membersToBeRemovedFromTargetPool) {
+
gceClusterConfigurationHolder.removeMember(memberId);
+
+ }
+
+ //remove them from GCE too
+
gceOperations.removeInstancesFromTargetPool(membersToBeRemovedFromTargetPool,
+
gceClusterConfigurationHolder.getTargetPoolName());
+ }
+
+ }
+
+ } else {
+ //doesn't have a GCEClusterConfigurationHolder object.
So crate a new one and add to hash map
+
+ log.info("Found a new cluster: " +
cluster.getClusterId());
+
+ if (cluster.getMembers().isEmpty()) {
+ log.info("Cluster " + cluster.getClusterId() + "
does not have any members. So not configuring");
+ } else {
+ activeClusterIdList.add(cluster.getClusterId());
+ List<String> instancesList = new
ArrayList<String>();
+ List<Integer> ipList = new ArrayList<Integer>();
+ for (Member member : cluster.getMembers()) {
+
+ //add instance to instance list
+ if (member.getInstanceId() != null) {
+ if (log.isDebugEnabled()) {
+ log.debug("Adding member " +
member.getMemberId() + " to instance list since the" +
+ "member id is not null");
+ }
+ instancesList.add(member.getInstanceId());
+ } else {
+ if (log.isDebugEnabled()) {
+ log.debug("Instance ID is null for " +
member.getMemberId() + " so not adding to" +
+ "the instance list");
+ }
+ }
+
+ //add forwarding rules(Ports to be forwarded)
+ for (Object port : member.getPorts()) {
+ int portValue = ((Port) port).getValue();
+ if (!ipList.contains(portValue)) { //if
port is not in list
+ //put the forwarding rule to list
+ if (log.isDebugEnabled()) {
+ log.debug("Port found: " +
portValue);
+ }
+ ipList.add(portValue);
+ }
+ }
+ }
+
+ GCEClusterConfigurationHolder
gceClusterConfigurationHolder = new GCEClusterConfigurationHolder(
+ cluster.getClusterId(), instancesList,
ipList);
+
+ //set target pool name
+ String targetPoolName =
targetPoolNameCreator(cluster.getClusterId());
+
gceClusterConfigurationHolder.setTargetPoolName(targetPoolName);
+
+ //set forwarding rule name
+ String forwardingRuleName =
forwardingRuleNameCreator(cluster.getClusterId());
+
gceClusterConfigurationHolder.setForwardingRuleName(forwardingRuleName);
+
+ //set health check name
+ String healthCheckName =
healthCheckNameCreator(cluster.getClusterId());
+
gceClusterConfigurationHolder.setHealthCheckName(healthCheckName);
+
+
clusterToLoadBalancerConfigurationMap.put(cluster.getClusterId(),
gceClusterConfigurationHolder);
+
createConfigurationForCluster(cluster.getClusterId());
+
+ }
+ }
+
+ }
+ }
+
+ //if any cluster is removed from the topology or if any cluster
does not have at least one member,
+ //remove those clusters from map and remove the configuration from
GCE too
+ for (String clusterId :
clusterToLoadBalancerConfigurationMap.keySet()) {
+ if (!activeClusterIdList.contains(clusterId)) {
+ log.info("Removing the configuration for cluster " +
clusterId);
+ deleteConfigurationForCluster(clusterId);
+ clusterToLoadBalancerConfigurationMap.remove(clusterId);
+ }
+ }
+ activeClusterIdList.clear();
+ log.info("Load balancer was configured as given topology");
+ return true;
+ }
+
+ /**
+ * This method is used to delete all forwarding rules, target pools
and health checks
+ * in IaaS side according to new topology
+ */
+ private void deleteConfigurationForCluster(String clusterId) throws
LoadBalancerExtensionException {
+
+ log.info("Deleting configuration for cluster " + clusterId);
+ GCEClusterConfigurationHolder gceClusterConfigurationHolder =
clusterToLoadBalancerConfigurationMap.get(clusterId);
+ //delete forwarding rule
+
gceOperations.deleteForwardingRule(gceClusterConfigurationHolder.getForwardingRuleName());
+ //delete target pool from GCE
+
gceOperations.deleteTargetPool(gceClusterConfigurationHolder.getTargetPoolName());
+ //delete health check from GCE
+
gceOperations.deleteHealthCheck(gceClusterConfigurationHolder.getHealthCheckName());
+ log.info("Deleted configuration for cluster " + clusterId);
+
+ }
+
+ /**
+ * This method is used to create target pools, forwarding rule and a
health check related to a cluster
+ * in IaaS side according to new topology
+ */
+ private void createConfigurationForCluster(String clusterId) throws
LoadBalancerExtensionException {
+
+ log.info("Creating configuration for cluster");
+
+ GCEClusterConfigurationHolder gceClusterConfigurationHolder =
clusterToLoadBalancerConfigurationMap.get(clusterId);
+
+ //create a health check
+
gceOperations.createHealthCheck(gceClusterConfigurationHolder.getHealthCheckName());
+
+ //crate a target pool in GCE
+
gceOperations.createTargetPool(gceClusterConfigurationHolder.getTargetPoolName(),
+ gceClusterConfigurationHolder.getHealthCheckName());
+
+ //add instances to target pool
+
gceOperations.addInstancesToTargetPool(gceClusterConfigurationHolder.getMemberList(),
+ gceClusterConfigurationHolder.getTargetPoolName());
+
+ //create forwarding rules in GCE
+ List<Integer> ipList = gceClusterConfigurationHolder.getIpList();
+ //need to create a port range String
+ String portRange;
+ //if the ip list is empty
+ if (ipList.isEmpty()) {
+ log.warn("Ip list is null");
+ //set all ports to be opened
+ portRange = "1-65535";
+
--- End diff --
The default port range might need to be configured or moved to a constant.
Please remove the blank line.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
