/*
* 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.
*/
package com.bergerkiller.bukkit.common.metrics;
import org.bukkit.Bukkit;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.configuration.InvalidConfigurationException;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.PluginDescriptionFile;
import com.bergerkiller.bukkit.common.ModuleLogger;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;
import java.util.Set;
import java.util.UUID;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* <p> The metrics class obtains data about a plugin and submits statistics about it to the metrics backend. </p> <p>
* Public methods provided by this class: </p>
* <code>
* Graph createGraph(String name); <br/>
* void addCustomData(BukkitMetrics.Plotter plotter); <br/>
* void start(); <br/>
* </code>
*/
public class Metrics {
/**
* The current revision number
*/
private final static int REVISION = 6;
/**
* The base url of the metrics domain
*/
private static final String BASE_URL = "http://mcstats.org";
/**
* The url used to report a server's status
*/
private static final String REPORT_URL = "/report/%s";
/**
* The separator to use for custom data. This MUST NOT change unless you are hosting your own version of metrics and
* want to change it.
*/
private static final String CUSTOM_DATA_SEPARATOR = "~~";
/**
* Interval of time to ping (in minutes)
*/
private static final int PING_INTERVAL = 10;
/**
* Loggers used for logging errors when DEBUG is enabled
*/
private static final Logger LOGGER = new ModuleLogger("Metrics");
/**
* 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 updating task
*/
private Thread updateThread;
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);
}
/**
* Removes a previously added Graph
*
* @param name of the Graph to remove
*/
public void removeGraph(final String name) {
if (name == null) {
throw new IllegalArgumentException("Graph name cannot be null");
}
synchronized (graphs) {
graphs.remove(name);
}
}
/**
* 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
synchronized (graphs) {
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");
}
synchronized (graphs) {
graphs.add(graph);
}
}
/**
* Start measuring statistics. This will immediately create an updating thread,
* immediately sending initial data to the metrics backend, and then after that
* it will post in increments of PING_INTERVAL * 60000 milliseconds.
*
* @return True if statistics measuring is (now) running, otherwise false.
*/
public boolean start() {
synchronized (optOutLock) {
// Did we opt out?
if (isOptOut()) {
return false;
}
// Is metrics already running?
if (updateThread != null) {
return true;
}
// Set up the updating task (we do not yet start it!)
updateThread = new Thread("Metrics updating thread of " + plugin.getName()) {
@Override
public void run() {
try {
boolean firstPost = true;
final Object syncLock = new Object();
final List<Graph> graphBuffer = new ArrayList<Graph>();
while (true) {
try {
// Disable Task, if it is running and the server owner decided to opt-out
if (isOptOut()) {
// End the updating thread
return;
}
// Update all graphs on the main thread
graphBuffer.clear();
synchronized (graphs) {
graphBuffer.addAll(graphs);
}
if (!graphBuffer.isEmpty()) {
Bukkit.getScheduler().scheduleSyncDelayedTask(plugin, new Runnable() {
@Override
public void run() {
for (Graph graph : graphBuffer) {
graph.onUpdate(plugin);
}
synchronized (syncLock) {
syncLock.notify();
}
}
});
// Wait for the previous task to be completed
synchronized (syncLock) {
syncLock.wait();
}
}
// 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 (Throwable t) {
if (debug) {
LOGGER.log(Level.INFO, t.getMessage());
}
}
// Wait out the pinging interval
Thread.sleep(60000 * PING_INTERVAL);
}
} catch (InterruptedException ex) {
// Thread is stopped - abort
}
}
};
updateThread.start();
return true;
}
}
/**
* Stops measuring statistics. This will immediately interrupt the updating
* thread, this way disabling all updates to the metrics backend.
*
* @return True if the statistics measuring is (now) stopped, otherwise false.
*/
public boolean stop() {
try {
if (updateThread != null) {
updateThread.interrupt();
updateThread = null;
}
return true;
} catch (SecurityException ex) {
ex.printStackTrace();
return false;
}
}
/**
* 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) {
LOGGER.log(Level.INFO, ex.getMessage());
}
return true;
} catch (InvalidConfigurationException ex) {
if (debug) {
LOGGER.log(Level.INFO, 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);
}
// Start updating thread
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);
}
// Stop updating thread
stop();
}
}
/**
* 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
final StringBuilder data = new StringBuilder();
// The plugin's description file containg all of the plugin data such as name, version, author, etc
data.append(encode("guid")).append('=').append(encode(guid));
encodeDataPair(data, "version", pluginVersion);
encodeDataPair(data, "server", serverVersion);
encodeDataPair(data, "players", Integer.toString(playersOnline));
encodeDataPair(data, "revision", String.valueOf(REVISION));
// 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";
}
encodeDataPair(data, "osname", osname);
encodeDataPair(data, "osarch", osarch);
encodeDataPair(data, "osversion", osversion);
encodeDataPair(data, "cores", Integer.toString(coreCount));
encodeDataPair(data, "online-mode", Boolean.toString(onlineMode));
encodeDataPair(data, "java_version", java_version);
// If we're pinging, append it
if (isPing) {
encodeDataPair(data, "ping", "true");
}
// Acquire a lock on the graphs, which lets us make the assumption we also lock everything
// inside of the graph (e.g plotters)
synchronized (graphs) {
final Iterator<Graph> iter = graphs.iterator();
while (iter.hasNext()) {
final Graph graph = iter.next();
for (Entry<String, Object> entry : graph.getPlotters().entrySet()) {
// Ignore null values
if (entry.getValue() == null) {
continue;
}
// The key name to send to the metrics server
// The format is C-GRAPHNAME-PLOTTERNAME where separator - is defined at the top
// Legacy (R4) submitters use the format Custom%s, or CustomPLOTTERNAME
final String key = String.format("C%s%s%s%s", CUSTOM_DATA_SEPARATOR, graph.getName(), CUSTOM_DATA_SEPARATOR, entry.getKey());
// Add it to the http post data :)
encodeDataPair(data, key, entry.getValue().toString());
}
}
}
// Create the url
URL url = new URL(BASE_URL + String.format(REPORT_URL, encode(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();
}
connection.setDoOutput(true);
// Write the data
final OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
writer.write(data.toString());
writer.flush();
// Now read the response
final BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
final String response = reader.readLine();
// close resources
writer.close();
reader.close();
if (response == null || response.startsWith("ERR")) {
throw new IOException(response); //Throw the exception
} else {
// Is this the first update this hour?
if (response.contains("OK This is your first update this hour")) {
Bukkit.getScheduler().scheduleSyncDelayedTask(plugin, new Runnable() {
public void run() {
synchronized (graphs) {
for (Graph graph : graphs) {
graph.onReset(plugin);
}
}
}
});
}
}
}
/**
* 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;
}
}
/**
* <p>Encode a key/value data pair to be used in a HTTP post request. This INCLUDES a & so the first key/value pair
* MUST be included manually, e.g:</p>
* <code>
* StringBuffer data = new StringBuffer();
* data.append(encode("guid")).append('=').append(encode(guid));
* encodeDataPair(data, "version", description.getVersion());
* </code>
*
* @param buffer the stringbuilder to append the data pair onto
* @param key the key value
* @param value the value
*/
private static void encodeDataPair(final StringBuilder buffer, final String key, final String value) throws UnsupportedEncodingException {
buffer.append('&').append(encode(key)).append('=').append(encode(value));
}
/**
* Encode text as UTF-8
*
* @param text the text to encode
* @return the encoded text, as UTF-8
*/
private static String encode(final String text) throws UnsupportedEncodingException {
return URLEncoder.encode(text, "UTF-8");
}
/**
* Attempts to create new Metrics for the plugin specified, and
* starts sending metrics information. If this operation fails,
* null is returned.
*
* @param plugin to initialize Metrics for
* @return the Metrics instance created, or null if this failed
*/
public static Metrics initialize(Plugin plugin) {
try {
final Metrics m = new Metrics(plugin);
m.start();
return m;
} catch (IOException e) {
plugin.getLogger().log(Level.SEVERE, "Failed to initialize Metrics");
e.printStackTrace();
return null;
}
}
}