path: root/Essentials/src/com/earth2me/essentials/metrics/Metrics.java

package com.earth2me.essentials.metrics;

/*
 * Copyright 2011 Tyler Blair. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
 * disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
 * following disclaimer in the documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those of the authors and contributors and
 * should not be interpreted as representing official policies, either expressed or implied, of anybody else.
 */

import java.io.*;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.*;
import java.util.logging.Level;
import java.util.zip.GZIPOutputStream;
import org.bukkit.Bukkit;
import org.bukkit.configuration.InvalidConfigurationException;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.PluginDescriptionFile;
import org.bukkit.scheduler.BukkitTask;

public class Metrics
{

	/**
	 * The current revision number
	 */
	private static final int REVISION = 7;

	/**
	 * The base url of the metrics domain
	 */
	private static final String BASE_URL = "http://report-metrics.essentials3.net";

	/**
	 * The url used to report a server's status
	 */
	private static final String REPORT_URL = "/plugin/%s";

	/**
	 * Interval of time to ping (in minutes)
	 */
	private static final int PING_INTERVAL = 15;

	/**
	 * The plugin this metrics submits for
	 */
	private final Plugin plugin;

	/**
	 * All of the custom graphs to submit to metrics
	 */
	private final Set<Graph> graphs = Collections.synchronizedSet(new HashSet<Graph>());

	/**
	 * The plugin configuration file
	 */
	private final YamlConfiguration configuration;

	/**
	 * The plugin configuration file
	 */
	private final File configurationFile;

	/**
	 * Unique server id
	 */
	private final String guid;

	/**
	 * Debug mode
	 */
	private final boolean debug;

	/**
	 * Lock for synchronization
	 */
	private final Object optOutLock = new Object();

	/**
	 * The scheduled task
	 */
	private volatile BukkitTask task = null;

	public Metrics(final Plugin plugin) throws IOException
	{
		if (plugin == null)
		{
			throw new IllegalArgumentException("Plugin cannot be null");
		}

		this.plugin = plugin;

		// load the config
		configurationFile = getConfigFile();
		configuration = YamlConfiguration.loadConfiguration(configurationFile);

		// add some defaults
		configuration.addDefault("opt-out", false);
		configuration.addDefault("guid", UUID.randomUUID().toString());
		configuration.addDefault("debug", false);

		// Do we need to create the file?
		if (configuration.get("guid", null) == null)
		{
			configuration.options().header("http://mcstats.org").copyDefaults(true);
			configuration.save(configurationFile);
		}

		// Load the guid then
		guid = configuration.getString("guid");
		debug = configuration.getBoolean("debug", false);
	}

	/**
	 * Construct and create a Graph that can be used to separate specific plotters to their own graphs on the metrics
	 * website. Plotters can be added to the graph object returned.
	 *
	 * @param name The name of the graph
	 * @return Graph object created. Will never return NULL under normal circumstances unless bad parameters are given
	 */
	public Graph createGraph(final String name)
	{
		if (name == null)
		{
			throw new IllegalArgumentException("Graph name cannot be null");
		}

		// Construct the graph object
		final Graph graph = new Graph(name);

		// Now we can add our graph
		graphs.add(graph);

		// and return back
		return graph;
	}

	/**
	 * Add a Graph object to BukkitMetrics that represents data for the plugin that should be sent to the backend
	 *
	 * @param graph The name of the graph
	 */
	public void addGraph(final Graph graph)
	{
		if (graph == null)
		{
			throw new IllegalArgumentException("Graph cannot be null");
		}

		graphs.add(graph);
	}

	/**
	 * Start measuring statistics. This will immediately create an async repeating task as the plugin and send the
	 * initial data to the metrics backend, and then after that it will post in increments of PING_INTERVAL * 1200
	 * ticks.
	 */
	public void start()
	{
		synchronized (optOutLock)
		{
			// Did we opt out?
			if (isOptOut())
			{
				return;
			}

			// Is metrics already running?
			if (task != null)
			{
				return;
			}

			// Begin hitting the server with glorious data
			task = plugin.getServer().getScheduler().runTaskTimerAsynchronously(plugin, new Runnable()
			{
				private boolean firstPost = true;

				public void run()
				{
					try
					{
						// This has to be synchronized or it can collide with the disable method.
						synchronized (optOutLock)
						{
							// Disable Task, if it is running and the server owner decided to opt-out
							if (isOptOut() && task != null)
							{
								task.cancel();
								task = null;
								// Tell all plotters to stop gathering information.
								for (Graph graph : graphs)
								{
									graph.onOptOut();
								}
							}
						}

						// We use the inverse of firstPost because if it is the first time we are posting,
						// it is not a interval ping, so it evaluates to FALSE
						// Each time thereafter it will evaluate to TRUE, i.e PING!
						postPlugin(!firstPost);

						// After the first post we set firstPost to false
						// Each post thereafter will be a ping
						firstPost = false;
					}
					catch (IOException e)
					{
						if (debug)
						{
							Bukkit.getLogger().log(Level.INFO, "[Metrics] " + e.getMessage());
						}
					}
				}
			}, 0, PING_INTERVAL * 1200);
		}
	}

	/**
	 * Has the server owner denied plugin metrics?
	 *
	 * @return true if metrics should be opted out of it
	 */
	public boolean isOptOut()
	{
		synchronized (optOutLock)
		{
			try
			{
				// Reload the metrics file
				configuration.load(getConfigFile());
			}
			catch (IOException ex)
			{
				if (debug)
				{
					Bukkit.getLogger().log(Level.INFO, "[Metrics] " + ex.getMessage());
				}
				return true;
			}
			catch (InvalidConfigurationException ex)
			{
				if (debug)
				{
					Bukkit.getLogger().log(Level.INFO, "[Metrics] " + ex.getMessage());
				}
				return true;
			}
			return configuration.getBoolean("opt-out", false);
		}
	}

	/**
	 * Enables metrics for the server by setting "opt-out" to false in the config file and starting the metrics task.
	 *
	 * @throws java.io.IOException
	 */
	public void enable() throws IOException
	{
		// This has to be synchronized or it can collide with the check in the task.
		synchronized (optOutLock)
		{
			// Check if the server owner has already set opt-out, if not, set it.
			if (isOptOut())
			{
				configuration.set("opt-out", false);
				configuration.save(configurationFile);
			}

			// Enable Task, if it is not running
			if (task == null)
			{
				start();
			}
		}
	}

	/**
	 * Disables metrics for the server by setting "opt-out" to true in the config file and canceling the metrics task.
	 *
	 * @throws java.io.IOException
	 */
	public void disable() throws IOException
	{
		// This has to be synchronized or it can collide with the check in the task.
		synchronized (optOutLock)
		{
			// Check if the server owner has already set opt-out, if not, set it.
			if (!isOptOut())
			{
				configuration.set("opt-out", true);
				configuration.save(configurationFile);
			}

			// Disable Task, if it is running
			if (task != null)
			{
				task.cancel();
				task = null;
			}
		}
	}

	/**
	 * Gets the File object of the config file that should be used to store data such as the GUID and opt-out status
	 *
	 * @return the File object for the config file
	 */
	public File getConfigFile()
	{
		// I believe the easiest way to get the base folder (e.g craftbukkit set via -P) for plugins to use
		// is to abuse the plugin object we already have
		// plugin.getDataFolder() => base/plugins/PluginA/
		// pluginsFolder => base/plugins/
		// The base is not necessarily relative to the startup directory.
		File pluginsFolder = plugin.getDataFolder().getParentFile();

		// return => base/plugins/PluginMetrics/config.yml
		return new File(new File(pluginsFolder, "PluginMetrics"), "config.yml");
	}

	/**
	 * Generic method that posts a plugin to the metrics website
	 */
	private void postPlugin(final boolean isPing) throws IOException
	{
		// Server software specific section
		PluginDescriptionFile description = plugin.getDescription();
		String pluginName = description.getName();
		boolean onlineMode = Bukkit.getServer().getOnlineMode(); // TRUE if online mode is enabled
		String pluginVersion = description.getVersion();
		String serverVersion = Bukkit.getVersion();
		int playersOnline = Bukkit.getServer().getOnlinePlayers().length;

		// END server software specific section -- all code below does not use any code outside of this class / Java

		// Construct the post data
		StringBuilder json = new StringBuilder(1024);
		json.append('{');

		// The plugin's description file containg all of the plugin data such as name, version, author, etc
		appendJSONPair(json, "guid", guid);
		appendJSONPair(json, "plugin_version", pluginVersion);
		appendJSONPair(json, "server_version", serverVersion);
		appendJSONPair(json, "players_online", Integer.toString(playersOnline));

		// New data as of R6
		String osname = System.getProperty("os.name");
		String osarch = System.getProperty("os.arch");
		String osversion = System.getProperty("os.version");
		String java_version = System.getProperty("java.version");
		int coreCount = Runtime.getRuntime().availableProcessors();

		// normalize os arch .. amd64 -> x86_64
		if (osarch.equals("amd64"))
		{
			osarch = "x86_64";
		}

		appendJSONPair(json, "osname", osname);
		appendJSONPair(json, "osarch", osarch);
		appendJSONPair(json, "osversion", osversion);
		appendJSONPair(json, "cores", Integer.toString(coreCount));
		appendJSONPair(json, "auth_mode", onlineMode ? "1" : "0");
		appendJSONPair(json, "java_version", java_version);

		// If we're pinging, append it
		if (isPing)
		{
			appendJSONPair(json, "ping", "1");
		}

		if (graphs.size() > 0)
		{
			synchronized (graphs)
			{
				json.append(',');
				json.append('"');
				json.append("graphs");
				json.append('"');
				json.append(':');
				json.append('{');

				boolean firstGraph = true;

				final Iterator<Graph> iter = graphs.iterator();

				while (iter.hasNext())
				{
					Graph graph = iter.next();

					StringBuilder graphJson = new StringBuilder();
					graphJson.append('{');

					for (Plotter plotter : graph.getPlotters())
					{
						appendJSONPair(graphJson, plotter.getColumnName(), Integer.toString(plotter.getValue()));
					}

					graphJson.append('}');

					if (!firstGraph)
					{
						json.append(',');
					}

					json.append(escapeJSON(graph.getName()));
					json.append(':');
					json.append(graphJson);

					firstGraph = false;
				}

				json.append('}');
			}
		}

		// close json
		json.append('}');

		// Create the url
		URL url = new URL(BASE_URL + String.format(REPORT_URL, urlEncode(pluginName)));

		// Connect to the website
		URLConnection connection;

		// Mineshafter creates a socks proxy, so we can safely bypass it
		// It does not reroute POST requests so we need to go around it
		if (isMineshafterPresent())
		{
			connection = url.openConnection(Proxy.NO_PROXY);
		}
		else
		{
			connection = url.openConnection();
		}


		byte[] uncompressed = json.toString().getBytes();
		byte[] compressed = gzip(json.toString());

		// Headers
		connection.addRequestProperty("User-Agent", "MCStats/" + REVISION);
		connection.addRequestProperty("Content-Type", "application/json");
		connection.addRequestProperty("Content-Encoding", "gzip");
		connection.addRequestProperty("Content-Length", Integer.toString(compressed.length));
		connection.addRequestProperty("Accept", "application/json");
		connection.addRequestProperty("Connection", "close");

		connection.setDoOutput(true);

		if (debug)
		{
			System.out.println("[Metrics] Prepared request for " + pluginName + " uncompressed=" + uncompressed.length + " compressed=" + compressed.length);
		}

		// Write the data
		OutputStream os = connection.getOutputStream();
		os.write(compressed);
		os.flush();

		// Now read the response
		final BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
		String response = reader.readLine();

		// close resources
		os.close();
		reader.close();

		if (response == null || response.startsWith("ERR") || response.startsWith("7"))
		{
			if (response == null)
			{
				response = "null";
			}
			else if (response.startsWith("7"))
			{
				response = response.substring(response.startsWith("7,") ? 2 : 1);
			}

			throw new IOException(response);
		}
		else
		{
			// Is this the first update this hour?
			if (response.equals("1") || response.contains("This is your first update this hour"))
			{
				synchronized (graphs)
				{
					final Iterator<Graph> iter = graphs.iterator();

					while (iter.hasNext())
					{
						final Graph graph = iter.next();

						for (Plotter plotter : graph.getPlotters())
						{
							plotter.reset();
						}
					}
				}
			}
		}
	}

	/**
	 * GZip compress a string of bytes
	 *
	 * @param input
	 * @return
	 */
	public static byte[] gzip(String input)
	{
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		GZIPOutputStream gzos = null;

		try
		{
			gzos = new GZIPOutputStream(baos);
			gzos.write(input.getBytes("UTF-8"));
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		finally
		{
			if (gzos != null)
			{
				try
				{
					gzos.close();
				}
				catch (IOException ignore)
				{
				}
			}
		}

		return baos.toByteArray();
	}

	/**
	 * Check if mineshafter is present. If it is, we need to bypass it to send POST requests
	 *
	 * @return true if mineshafter is installed on the server
	 */
	private boolean isMineshafterPresent()
	{
		try
		{
			Class.forName("mineshafter.MineServer");
			return true;
		}
		catch (Exception e)
		{
			return false;
		}
	}

	/**
	 * Appends a json encoded key/value pair to the given string builder.
	 *
	 * @param json
	 * @param key
	 * @param value
	 * @throws UnsupportedEncodingException
	 */
	private static void appendJSONPair(StringBuilder json, String key, String value) throws UnsupportedEncodingException
	{
		boolean isValueNumeric;

		try
		{
			Double.parseDouble(value);
			isValueNumeric = true;
		}
		catch (NumberFormatException e)
		{
			isValueNumeric = false;
		}

		if (json.charAt(json.length() - 1) != '{')
		{
			json.append(',');
		}

		json.append(escapeJSON(key));
		json.append(':');

		if (isValueNumeric)
		{
			json.append(value);
		}
		else
		{
			json.append(escapeJSON(value));
		}
	}

	/**
	 * Escape a string to create a valid JSON string
	 *
	 * @param text
	 * @return
	 */
	private static String escapeJSON(String text)
	{
		StringBuilder builder = new StringBuilder();

		builder.append('"');
		for (int index = 0; index < text.length(); index++)
		{
			char chr = text.charAt(index);

			switch (chr)
			{
			case '"':
			case '\\':
				builder.append('\\');
				builder.append(chr);
				break;
			case '\b':
				builder.append("\\b");
				break;
			case '\t':
				builder.append("\\t");
				break;
			case '\n':
				builder.append("\\n");
				break;
			case '\r':
				builder.append("\\r");
				break;
			default:
				if (chr < ' ')
				{
					String t = "000" + Integer.toHexString(chr);
					builder.append("\\u" + t.substring(t.length() - 4));
				}
				else
				{
					builder.append(chr);
				}
				break;
			}
		}
		builder.append('"');

		return builder.toString();
	}

	/**
	 * Encode text as UTF-8
	 *
	 * @param text the text to encode
	 * @return the encoded text, as UTF-8
	 */
	private static String urlEncode(final String text) throws UnsupportedEncodingException
	{
		return URLEncoder.encode(text, "UTF-8");
	}


	/**
	 * Represents a custom graph on the website
	 */
	public static class Graph
	{
		/**
		 * The graph's name, alphanumeric and spaces only :) If it does not comply to the above when submitted, it is
		 * rejected
		 */
		private final String name;
		/**
		 * The set of plotters that are contained within this graph
		 */
		private final Set<Plotter> plotters = new LinkedHashSet<Plotter>();

		private Graph(final String name)
		{
			this.name = name;
		}

		/**
		 * Gets the graph's name
		 *
		 * @return the Graph's name
		 */
		public String getName()
		{
			return name;
		}

		/**
		 * Add a plotter to the graph, which will be used to plot entries
		 *
		 * @param plotter the plotter to add to the graph
		 */
		public void addPlotter(final Plotter plotter)
		{
			plotters.add(plotter);
		}

		/**
		 * Remove a plotter from the graph
		 *
		 * @param plotter the plotter to remove from the graph
		 */
		public void removePlotter(final Plotter plotter)
		{
			plotters.remove(plotter);
		}

		/**
		 * Gets an <b>unmodifiable</b> set of the plotter objects in the graph
		 *
		 * @return an unmodifiable {@link java.util.Set} of the plotter objects
		 */
		public Set<Plotter> getPlotters()
		{
			return Collections.unmodifiableSet(plotters);
		}

		@Override
		public int hashCode()
		{
			return name.hashCode();
		}

		@Override
		public boolean equals(final Object object)
		{
			if (!(object instanceof Graph))
			{
				return false;
			}

			final Graph graph = (Graph)object;
			return graph.name.equals(name);
		}

		/**
		 * Called when the server owner decides to opt-out of BukkitMetrics while the server is running.
		 */
		protected void onOptOut()
		{
		}
	}


	/**
	 * Interface used to collect custom data for a plugin
	 */
	public static abstract class Plotter
	{
		/**
		 * The plot's name
		 */
		private final String name;

		/**
		 * Construct a plotter with the default plot name
		 */
		public Plotter()
		{
			this("Default");
		}

		/**
		 * Construct a plotter with a specific plot name
		 *
		 * @param name the name of the plotter to use, which will show up on the website
		 */
		public Plotter(final String name)
		{
			this.name = name;
		}

		/**
		 * Get the current value for the plotted point. Since this function defers to an external function it may or may
		 * not return immediately thus cannot be guaranteed to be thread friendly or safe. This function can be called
		 * from any thread so care should be taken when accessing resources that need to be synchronized.
		 *
		 * @return the current value for the point to be plotted.
		 */
		public abstract int getValue();

		/**
		 * Get the column name for the plotted point
		 *
		 * @return the plotted point's column name
		 */
		public String getColumnName()
		{
			return name;
		}

		/**
		 * Called after the website graphs have been updated
		 */
		public void reset()
		{
		}

		@Override
		public int hashCode()
		{
			return getColumnName().hashCode();
		}

		@Override
		public boolean equals(final Object object)
		{
			if (!(object instanceof Plotter))
			{
				return false;
			}

			final Plotter plotter = (Plotter)object;
			return plotter.name.equals(name) && plotter.getValue() == getValue();
		}
	}
}