GetAppCommand.java

/*******************************************************************************
 * Copyright (c) 2013 IBM Corporation and others 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 * IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.orion.server.cf.commands;

import java.net.URI;
import java.net.URLEncoder;
import java.util.Arrays;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.httpclient.methods.GetMethod;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.URIUtil;
import org.eclipse.orion.server.cf.ExpiryCache;
import org.eclipse.orion.server.cf.objects.App;
import org.eclipse.orion.server.cf.objects.Target;
import org.eclipse.orion.server.cf.utils.HttpUtil;
import org.eclipse.orion.server.core.ServerStatus;
import org.eclipse.osgi.util.NLS;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class GetAppCommand extends AbstractCFCommand {

	private static final int CACHE_EXPIRES_MS = 30000;
	private static final int MAX_CACHE_SIZE = 1000;

	private final Logger logger = LoggerFactory.getLogger("org.eclipse.orion.server.cf"); //$NON-NLS-1$

	private String commandName;
	private String name;
	private App app;

	static ExpiryCache<App> appCache = new ExpiryCache<App>(MAX_CACHE_SIZE, CACHE_EXPIRES_MS);

	public GetAppCommand(Target target, String name) {
		super(target);

		String[] bindings = {name};
		this.commandName = NLS.bind("Get application {0}", bindings);
		this.name = name;
	}

	public static void expire(Target target, String name) {
		appCache.remove(Arrays.asList(target, name));
	}

	public ServerStatus _doIt() {
		try {
			List<Object> key = Arrays.asList(target, name);
			app = appCache.get(key);
			if (app != null) {
				return new ServerStatus(Status.OK_STATUS, HttpServletResponse.SC_OK, this.app.toJSON());
			}
			URI targetURI = URIUtil.toURI(target.getUrl());

			// Find the app
			String appsUrl = target.getSpace().getCFJSON().getJSONObject("entity").getString("apps_url");
			URI appsURI = targetURI.resolve(appsUrl);
			GetMethod getAppsMethod = new GetMethod(appsURI.toString());
			ServerStatus confStatus = HttpUtil.configureHttpMethod(getAppsMethod, target.getCloud());
			if (!confStatus.isOK())
				return confStatus;
			
			getAppsMethod.setQueryString("q=name:" + URLEncoder.encode(name, "UTF8") + "&inline-relations-depth=1");

			ServerStatus getStatus = HttpUtil.executeMethod(getAppsMethod);
			if (!getStatus.isOK())
				return getStatus;

			JSONObject apps = getStatus.getJsonData();

			if (!apps.has("resources") || apps.getJSONArray("resources").length() == 0)
				return new ServerStatus(IStatus.ERROR, HttpServletResponse.SC_NOT_FOUND, "Application not found", null);

			// Get more details about the app
			JSONObject appJSON = apps.getJSONArray("resources").getJSONObject(0).getJSONObject("metadata");

			String summaryAppUrl = appJSON.getString("url") + "/summary";
			URI summaryAppURI = targetURI.resolve(summaryAppUrl);

			GetMethod getSummaryMethod = new GetMethod(summaryAppURI.toString());
			confStatus = HttpUtil.configureHttpMethod(getSummaryMethod, target.getCloud());
			if (!confStatus.isOK())
				return confStatus;

			getStatus = HttpUtil.executeMethod(getSummaryMethod);
			if (!getStatus.isOK())
				return getStatus;

			JSONObject summaryJSON = getStatus.getJsonData();
			
			// instances
			String instancesUrl = appJSON.getString("url") + "/instances";
			URI instancesURI = targetURI.resolve(instancesUrl);

			GetMethod getInstancesMethod = new GetMethod(instancesURI.toString());
			confStatus = HttpUtil.configureHttpMethod(getInstancesMethod, target.getCloud());
			if (!confStatus.isOK())
				return confStatus;

			getStatus = HttpUtil.executeMethod(getInstancesMethod);
			JSONObject instancesJSON = getStatus.getJsonData();

			this.app = new App();
			this.app.setAppJSON(appJSON);
			this.app.setSummaryJSON(summaryJSON);
			this.app.setName(summaryJSON.getString("name"));
			this.app.setGuid(summaryJSON.getString("guid"));
			appCache.put(key, app);
			
			JSONObject result = this.app.toJSON();
			result.put("instances_details", instancesJSON);

			return new ServerStatus(Status.OK_STATUS, HttpServletResponse.SC_OK, this.app.toJSON());
		} catch (Exception e) {
			String msg = NLS.bind("An error occured when performing operation {0}", commandName); //$NON-NLS-1$
			logger.error(msg, e);
			return new ServerStatus(IStatus.ERROR, HttpServletResponse.SC_INTERNAL_SERVER_ERROR, msg, e);
		}
	}

	public App getApp() {
		return app;
	}
}