Github user imesh commented on a diff in the pull request:
https://github.com/apache/stratos/pull/419#discussion_r36939331
--- Diff:
extensions/load-balancer/gce-extension/src/main/java/org/apache/stratos/gce/extension/util/GCEOperations.java
---
@@ -0,0 +1,582 @@
+/*
+ * 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.util;
+
+import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
+import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
+import com.google.api.client.http.HttpTransport;
+import com.google.api.client.json.JsonFactory;
+import com.google.api.client.json.jackson2.JacksonFactory;
+import com.google.api.services.compute.Compute;
+import com.google.api.services.compute.ComputeScopes;
+import com.google.api.services.compute.model.*;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.stratos.gce.extension.config.GCEContext;
+import
org.apache.stratos.load.balancer.extension.api.exception.LoadBalancerExtensionException;
+
+import java.io.File;
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * All the GCE API calls will be done using this class
+ */
+public class GCEOperations {
+ private static final Log log = LogFactory.getLog(GCEOperations.class);
+
+ //project related
+ private static final String PROJECT_NAME =
GCEContext.getInstance().getProjectName();
+ private static final String PROJECT_ID =
GCEContext.getInstance().getProjectID();
+ private static final String REGION_NAME =
GCEContext.getInstance().getRegionName();
+
+ //auth
+ private static final String KEY_FILE_PATH =
GCEContext.getInstance().getKeyFilePath();
+ private static final String ACCOUNT_ID =
GCEContext.getInstance().getGceAccountID();
+
+ //health check
+ private static final String HEALTH_CHECK_REQUEST_PATH =
GCEContext.getInstance().getHealthCheckRequestPath();
+ private static final String HEALTH_CHECK_PORT =
GCEContext.getInstance().getHealthCheckPort();
+ private static final String HEALTH_CHECK_TIME_OUT_SEC =
GCEContext.getInstance().getHealthCheckTimeOutSec();
+ private static final String HEALTH_CHECK_INTERVAL_SEC =
GCEContext.getInstance().getHealthCheckIntervalSec();
+ private static final String HEALTH_CHECK_UNHEALTHY_THRESHOLD =
GCEContext.getInstance().getHealthCheckUnhealthyThreshold();
+ private static final String HEALTH_CHECK_HEALTHY_THRESHOLD =
GCEContext.getInstance().getHealthCheckHealthyThreshold();
+
+ //a timeout for operation completion
+ private static final int OPERATION_TIMEOUT =
Integer.parseInt(GCEContext.getInstance().getOperationTimeout());
+ static Compute compute;
+
+ /**
+ * Constructor for GCE Operations Class
+ */
+ public GCEOperations() throws IOException, GeneralSecurityException {
+ buildComputeEngineObject();
+ }
+
+ /**
+ * Authorize and build compute engine object
+ */
+ private void buildComputeEngineObject() throws IOException,
GeneralSecurityException {
+
+ try {
+
+ if (log.isDebugEnabled()) {
+ log.debug("Authorizing and building the compute engine
object");
+ }
+
+ HttpTransport httpTransport =
GoogleNetHttpTransport.newTrustedTransport();
+ JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();
+
+ GoogleCredential credential = new
GoogleCredential.Builder().setTransport(httpTransport)
+ .setJsonFactory(jsonFactory)
+ .setServiceAccountId(ACCOUNT_ID)
+
.setServiceAccountScopes(Collections.singleton(ComputeScopes.COMPUTE))
+ .setServiceAccountPrivateKeyFromP12File(new
File(KEY_FILE_PATH))
+ .build();
+
+ // Create compute engine object
+ compute = new Compute.Builder(
+ httpTransport, jsonFactory,
null).setApplicationName(PROJECT_NAME)
+ .setHttpRequestInitializer(credential).build();
+ if (log.isDebugEnabled()) {
+ log.debug("Successfully built the compute engine object");
+ }
+ } catch (GeneralSecurityException e) {
+ //Security exception occurred. Cant proceed further
+ log.error("Could not authenticate and build compute object");
+ throw new GeneralSecurityException(e);
+ } catch (IOException e) {
+ //IO exception occurred. Cant proceed further
+ log.error("Could not authenticate and build compute object");
+ throw new IOException(e);
+ }
+ }
+
+ /**
+ * Get list of running instances in given project and zone.(This
method can be used
+ * to check whether a given instance is available or not in a given
project
+ * and zone)
+ *
+ * @return instanceList - list of instances(members in Stratos side)
+ */
+ public static InstanceList getInstanceList(String zoneName, String
filter) {
--- End diff --
Method comment is not up to date, parameters are missing.
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