added bstats metrics
This commit is contained in:
@@ -23,6 +23,7 @@ public class BungeeMain extends Plugin
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public void onEnable()
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{
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new MetricsLite(this);
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saveDefaultConfig();
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if (!reloadConfig())
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{
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@@ -0,0 +1,385 @@
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package me.oskar3123.staffchat.bungee;
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import com.google.gson.JsonArray;
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import com.google.gson.JsonObject;
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import net.md_5.bungee.api.plugin.Plugin;
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import net.md_5.bungee.api.scheduler.TaskScheduler;
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import net.md_5.bungee.config.Configuration;
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import net.md_5.bungee.config.ConfigurationProvider;
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import net.md_5.bungee.config.YamlConfiguration;
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import javax.net.ssl.HttpsURLConnection;
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import java.io.BufferedReader;
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import java.io.BufferedWriter;
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import java.io.ByteArrayOutputStream;
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import java.io.DataOutputStream;
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import java.io.File;
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import java.io.FileReader;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.lang.reflect.InvocationTargetException;
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import java.net.URL;
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import java.nio.file.Path;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Timer;
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import java.util.TimerTask;
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import java.util.UUID;
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import java.util.concurrent.TimeUnit;
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import java.util.logging.Level;
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import java.util.zip.GZIPOutputStream;
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/**
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* bStats collects some data for plugin authors.
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*
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* Check out https://bStats.org/ to learn more about bStats!
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*/
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@SuppressWarnings("all")
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public class MetricsLite {
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static {
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// Maven's Relocate is clever and changes strings, too. So we have to use this little "trick" ... :D
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final String defaultPackage = new String(new byte[] { 'o', 'r', 'g', '.', 'b', 's', 't', 'a', 't', 's' });
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final String examplePackage = new String(new byte[] { 'y', 'o', 'u', 'r', '.', 'p', 'a', 'c', 'k', 'a', 'g', 'e' });
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// We want to make sure nobody just copy & pastes the example and use the wrong package names
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if (MetricsLite.class.getPackage().getName().equals(defaultPackage) || MetricsLite.class.getPackage().getName().equals(examplePackage)) {
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throw new IllegalStateException("bStats Metrics class has not been relocated correctly!");
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}
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}
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// The version of this bStats class
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public static final int B_STATS_VERSION = 1;
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// The url to which the data is sent
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private static final String URL = "https://bStats.org/submitData/bungeecord";
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// The plugin
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private final Plugin plugin;
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// Is bStats enabled on this server?
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private boolean enabled;
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// The uuid of the server
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private String serverUUID;
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// Should failed requests be logged?
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private boolean logFailedRequests = false;
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// A list with all known metrics class objects including this one
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private static final List<Object> knownMetricsInstances = new ArrayList<>();
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public MetricsLite(Plugin plugin) {
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this.plugin = plugin;
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try {
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loadConfig();
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} catch (IOException e) {
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// Failed to load configuration
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plugin.getLogger().log(Level.WARNING, "Failed to load bStats config!", e);
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return;
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}
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// We are not allowed to send data about this server :(
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if (!enabled) {
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return;
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}
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Class<?> usedMetricsClass = getFirstBStatsClass();
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if (usedMetricsClass == null) {
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// Failed to get first metrics class
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return;
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}
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if (usedMetricsClass == getClass()) {
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// We are the first! :)
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linkMetrics(this);
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startSubmitting();
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} else {
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// We aren't the first so we link to the first metrics class
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try {
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usedMetricsClass.getMethod("linkMetrics", Object.class).invoke(null,this);
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} catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
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if (logFailedRequests) {
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plugin.getLogger().log(Level.WARNING, "Failed to link to first metrics class " + usedMetricsClass.getName() + "!", e);
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}
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}
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}
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}
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/**
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* Links an other metrics class with this class.
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* This method is called using Reflection.
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*
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* @param metrics An object of the metrics class to link.
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*/
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public static void linkMetrics(Object metrics) {
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knownMetricsInstances.add(metrics);
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}
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/**
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* Gets the plugin specific data.
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* This method is called using Reflection.
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*
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* @return The plugin specific data.
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*/
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public JsonObject getPluginData() {
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JsonObject data = new JsonObject();
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String pluginName = plugin.getDescription().getName();
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String pluginVersion = plugin.getDescription().getVersion();
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data.addProperty("pluginName", pluginName);
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data.addProperty("pluginVersion", pluginVersion);
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JsonArray customCharts = new JsonArray();
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data.add("customCharts", customCharts);
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return data;
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}
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private void startSubmitting() {
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// We use a timer cause want to be independent from the server tps
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final Timer timer = new Timer(true);
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timer.scheduleAtFixedRate(new TimerTask() {
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@Override
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public void run() {
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// The data collection (e.g. for custom graphs) is done sync
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// Don't be afraid! The connection to the bStats server is still async, only the stats collection is sync ;)
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TaskScheduler scheduler = plugin.getProxy().getScheduler();
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scheduler.schedule(plugin, new Runnable() {
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@Override
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public void run() {
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submitData();
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}
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}, 0L, TimeUnit.SECONDS);
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}
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}, 1000*60*2, 1000*60*30);
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// Submit the data every 30 minutes, first time after 2 minutes to give other plugins enough time to start
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// WARNING: Changing the frequency has no effect but your plugin WILL be blocked/deleted!
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// WARNING: Just don't do it!
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}
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/**
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* Gets the server specific data.
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*
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* @return The server specific data.
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*/
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private JsonObject getServerData() {
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// Minecraft specific data
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int playerAmount = plugin.getProxy().getOnlineCount();
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playerAmount = playerAmount > 500 ? 500 : playerAmount;
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int onlineMode = plugin.getProxy().getConfig().isOnlineMode() ? 1 : 0;
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String bungeecordVersion = plugin.getProxy().getVersion();
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int managedServers = plugin.getProxy().getServers().size();
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// OS/Java specific data
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String javaVersion = System.getProperty("java.version");
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String osName = System.getProperty("os.name");
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String osArch = System.getProperty("os.arch");
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String osVersion = System.getProperty("os.version");
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int coreCount = Runtime.getRuntime().availableProcessors();
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JsonObject data = new JsonObject();
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data.addProperty("serverUUID", serverUUID);
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data.addProperty("playerAmount", playerAmount);
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data.addProperty("managedServers", managedServers);
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data.addProperty("onlineMode", onlineMode);
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data.addProperty("bungeecordVersion", bungeecordVersion);
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data.addProperty("javaVersion", javaVersion);
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data.addProperty("osName", osName);
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data.addProperty("osArch", osArch);
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data.addProperty("osVersion", osVersion);
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data.addProperty("coreCount", coreCount);
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return data;
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}
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/**
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* Collects the data and sends it afterwards.
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*/
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private void submitData() {
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final JsonObject data = getServerData();
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final JsonArray pluginData = new JsonArray();
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// Search for all other bStats Metrics classes to get their plugin data
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for (Object metrics : knownMetricsInstances) {
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try {
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Object plugin = metrics.getClass().getMethod("getPluginData").invoke(metrics);
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if (plugin instanceof JsonObject) {
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pluginData.add((JsonObject) plugin);
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}
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} catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException ignored) { }
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}
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data.add("plugins", pluginData);
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// Create a new thread for the connection to the bStats server
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new Thread(new Runnable() {
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@Override
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public void run() {
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try {
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// Send the data
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sendData(data);
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} catch (Exception e) {
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// Something went wrong! :(
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if (logFailedRequests) {
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plugin.getLogger().log(Level.WARNING, "Could not submit plugin stats!", e);
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}
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}
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}
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}).start();
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}
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/**
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* Loads the bStats configuration.
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*
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* @throws IOException If something did not work :(
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*/
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private void loadConfig() throws IOException {
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Path configPath = plugin.getDataFolder().toPath().getParent().resolve("bStats");
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configPath.toFile().mkdirs();
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File configFile = new File(configPath.toFile(), "config.yml");
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if (!configFile.exists()) {
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writeFile(configFile,
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"#bStats collects some data for plugin authors like how many servers are using their plugins.",
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"#To honor their work, you should not disable it.",
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"#This has nearly no effect on the server performance!",
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"#Check out https://bStats.org/ to learn more :)",
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"enabled: true",
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"serverUuid: \"" + UUID.randomUUID().toString() + "\"",
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"logFailedRequests: false");
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}
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Configuration configuration = ConfigurationProvider.getProvider(YamlConfiguration.class).load(configFile);
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// Load configuration
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enabled = configuration.getBoolean("enabled", true);
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serverUUID = configuration.getString("serverUuid");
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logFailedRequests = configuration.getBoolean("logFailedRequests", false);
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}
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/**
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* Gets the first bStat Metrics class.
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*
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* @return The first bStats metrics class.
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*/
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private Class<?> getFirstBStatsClass() {
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Path configPath = plugin.getDataFolder().toPath().getParent().resolve("bStats");
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configPath.toFile().mkdirs();
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File tempFile = new File(configPath.toFile(), "temp.txt");
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try {
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String className = readFile(tempFile);
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if (className != null) {
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try {
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// Let's check if a class with the given name exists.
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return Class.forName(className);
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} catch (ClassNotFoundException ignored) { }
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}
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writeFile(tempFile, getClass().getName());
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return getClass();
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} catch (IOException e) {
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if (logFailedRequests) {
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plugin.getLogger().log(Level.WARNING, "Failed to get first bStats class!", e);
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}
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return null;
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}
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}
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/**
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* Reads the first line of the file.
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*
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* @param file The file to read. Cannot be null.
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* @return The first line of the file or <code>null</code> if the file does not exist or is empty.
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* @throws IOException If something did not work :(
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*/
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private String readFile(File file) throws IOException {
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if (!file.exists()) {
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return null;
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}
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try (
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FileReader fileReader = new FileReader(file);
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BufferedReader bufferedReader = new BufferedReader(fileReader);
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) {
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return bufferedReader.readLine();
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}
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}
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/**
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* Writes a String to a file. It also adds a note for the user,
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*
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* @param file The file to write to. Cannot be null.
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* @param lines The lines to write.
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* @throws IOException If something did not work :(
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*/
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private void writeFile(File file, String... lines) throws IOException {
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if (!file.exists()) {
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file.createNewFile();
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}
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try (
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FileWriter fileWriter = new FileWriter(file);
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BufferedWriter bufferedWriter = new BufferedWriter(fileWriter)
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) {
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for (String line : lines) {
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bufferedWriter.write(line);
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bufferedWriter.newLine();
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}
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}
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}
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/**
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* Sends the data to the bStats server.
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*
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* @param data The data to send.
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* @throws Exception If the request failed.
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*/
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private static void sendData(JsonObject data) throws Exception {
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if (data == null) {
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throw new IllegalArgumentException("Data cannot be null");
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}
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HttpsURLConnection connection = (HttpsURLConnection) new URL(URL).openConnection();
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// Compress the data to save bandwidth
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byte[] compressedData = compress(data.toString());
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// Add headers
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connection.setRequestMethod("POST");
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connection.addRequestProperty("Accept", "application/json");
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connection.addRequestProperty("Connection", "close");
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connection.addRequestProperty("Content-Encoding", "gzip"); // We gzip our request
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connection.addRequestProperty("Content-Length", String.valueOf(compressedData.length));
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connection.setRequestProperty("Content-Type", "application/json"); // We send our data in JSON format
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connection.setRequestProperty("User-Agent", "MC-Server/" + B_STATS_VERSION);
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// Send data
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connection.setDoOutput(true);
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DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());
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outputStream.write(compressedData);
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outputStream.flush();
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outputStream.close();
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connection.getInputStream().close(); // We don't care about the response - Just send our data :)
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}
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/**
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* Gzips the given String.
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*
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* @param str The string to gzip.
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* @return The gzipped String.
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* @throws IOException If the compression failed.
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*/
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private static byte[] compress(final String str) throws IOException {
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if (str == null) {
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return null;
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}
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ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
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GZIPOutputStream gzip = new GZIPOutputStream(outputStream);
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gzip.write(str.getBytes("UTF-8"));
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gzip.close();
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return outputStream.toByteArray();
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}
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}
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@@ -15,6 +15,7 @@ public class Main extends JavaPlugin
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public void onEnable()
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{
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new MetricsLite(this);
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saveDefaultConfig();
|
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registerCommands();
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registerEvents();
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@@ -0,0 +1,293 @@
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package me.oskar3123.staffchat.spigot;
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import org.bukkit.Bukkit;
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import org.bukkit.configuration.file.YamlConfiguration;
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import org.bukkit.plugin.ServicePriority;
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import org.bukkit.plugin.java.JavaPlugin;
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import org.json.simple.JSONArray;
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import org.json.simple.JSONObject;
|
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|
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import javax.net.ssl.HttpsURLConnection;
|
||||
import java.io.ByteArrayOutputStream;
|
||||
import java.io.DataOutputStream;
|
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import java.io.File;
|
||||
import java.io.IOException;
|
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import java.lang.reflect.InvocationTargetException;
|
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import java.net.URL;
|
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import java.util.Timer;
|
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import java.util.TimerTask;
|
||||
import java.util.UUID;
|
||||
import java.util.logging.Level;
|
||||
import java.util.zip.GZIPOutputStream;
|
||||
|
||||
/**
|
||||
* bStats collects some data for plugin authors.
|
||||
*
|
||||
* Check out https://bStats.org/ to learn more about bStats!
|
||||
*/
|
||||
@SuppressWarnings("all")
|
||||
public class MetricsLite {
|
||||
|
||||
static {
|
||||
// Maven's Relocate is clever and changes strings, too. So we have to use this little "trick" ... :D
|
||||
final String defaultPackage = new String(new byte[] { 'o', 'r', 'g', '.', 'b', 's', 't', 'a', 't', 's' });
|
||||
final String examplePackage = new String(new byte[] { 'y', 'o', 'u', 'r', '.', 'p', 'a', 'c', 'k', 'a', 'g', 'e' });
|
||||
// We want to make sure nobody just copy & pastes the example and use the wrong package names
|
||||
if (MetricsLite.class.getPackage().getName().equals(defaultPackage) || MetricsLite.class.getPackage().getName().equals(examplePackage)) {
|
||||
throw new IllegalStateException("bStats Metrics class has not been relocated correctly!");
|
||||
}
|
||||
}
|
||||
|
||||
// The version of this bStats class
|
||||
public static final int B_STATS_VERSION = 1;
|
||||
|
||||
// The url to which the data is sent
|
||||
private static final String URL = "https://bStats.org/submitData/bukkit";
|
||||
|
||||
// Should failed requests be logged?
|
||||
private static boolean logFailedRequests;
|
||||
|
||||
// The uuid of the server
|
||||
private static String serverUUID;
|
||||
|
||||
// The plugin
|
||||
private final JavaPlugin plugin;
|
||||
|
||||
/**
|
||||
* Class constructor.
|
||||
*
|
||||
* @param plugin The plugin which stats should be submitted.
|
||||
*/
|
||||
public MetricsLite(JavaPlugin plugin) {
|
||||
if (plugin == null) {
|
||||
throw new IllegalArgumentException("Plugin cannot be null!");
|
||||
}
|
||||
this.plugin = plugin;
|
||||
|
||||
// Get the config file
|
||||
File bStatsFolder = new File(plugin.getDataFolder().getParentFile(), "bStats");
|
||||
File configFile = new File(bStatsFolder, "config.yml");
|
||||
YamlConfiguration config = YamlConfiguration.loadConfiguration(configFile);
|
||||
|
||||
// Check if the config file exists
|
||||
if (!config.isSet("serverUuid")) {
|
||||
|
||||
// Add default values
|
||||
config.addDefault("enabled", true);
|
||||
// Every server gets it's unique random id.
|
||||
config.addDefault("serverUuid", UUID.randomUUID().toString());
|
||||
// Should failed request be logged?
|
||||
config.addDefault("logFailedRequests", false);
|
||||
|
||||
// Inform the server owners about bStats
|
||||
config.options().header(
|
||||
"bStats collects some data for plugin authors like how many servers are using their plugins.\n" +
|
||||
"To honor their work, you should not disable it.\n" +
|
||||
"This has nearly no effect on the server performance!\n" +
|
||||
"Check out https://bStats.org/ to learn more :)"
|
||||
).copyDefaults(true);
|
||||
try {
|
||||
config.save(configFile);
|
||||
} catch (IOException ignored) { }
|
||||
}
|
||||
|
||||
// Load the data
|
||||
serverUUID = config.getString("serverUuid");
|
||||
logFailedRequests = config.getBoolean("logFailedRequests", false);
|
||||
if (config.getBoolean("enabled", true)) {
|
||||
boolean found = false;
|
||||
// Search for all other bStats Metrics classes to see if we are the first one
|
||||
for (Class<?> service : Bukkit.getServicesManager().getKnownServices()) {
|
||||
try {
|
||||
service.getField("B_STATS_VERSION"); // Our identifier :)
|
||||
found = true; // We aren't the first
|
||||
break;
|
||||
} catch (NoSuchFieldException ignored) { }
|
||||
}
|
||||
// Register our service
|
||||
Bukkit.getServicesManager().register(MetricsLite.class, this, plugin, ServicePriority.Normal);
|
||||
if (!found) {
|
||||
// We are the first!
|
||||
startSubmitting();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Starts the Scheduler which submits our data every 30 minutes.
|
||||
*/
|
||||
private void startSubmitting() {
|
||||
final Timer timer = new Timer(true); // We use a timer cause the Bukkit scheduler is affected by server lags
|
||||
timer.scheduleAtFixedRate(new TimerTask() {
|
||||
@Override
|
||||
public void run() {
|
||||
if (!plugin.isEnabled()) { // Plugin was disabled
|
||||
timer.cancel();
|
||||
return;
|
||||
}
|
||||
// Nevertheless we want our code to run in the Bukkit main thread, so we have to use the Bukkit scheduler
|
||||
// Don't be afraid! The connection to the bStats server is still async, only the stats collection is sync ;)
|
||||
Bukkit.getScheduler().runTask(plugin, new Runnable() {
|
||||
@Override
|
||||
public void run() {
|
||||
submitData();
|
||||
}
|
||||
});
|
||||
}
|
||||
}, 1000*60*5, 1000*60*30);
|
||||
// Submit the data every 30 minutes, first time after 5 minutes to give other plugins enough time to start
|
||||
// WARNING: Changing the frequency has no effect but your plugin WILL be blocked/deleted!
|
||||
// WARNING: Just don't do it!
|
||||
}
|
||||
|
||||
/**
|
||||
* Gets the plugin specific data.
|
||||
* This method is called using Reflection.
|
||||
*
|
||||
* @return The plugin specific data.
|
||||
*/
|
||||
public JSONObject getPluginData() {
|
||||
JSONObject data = new JSONObject();
|
||||
|
||||
String pluginName = plugin.getDescription().getName();
|
||||
String pluginVersion = plugin.getDescription().getVersion();
|
||||
|
||||
data.put("pluginName", pluginName); // Append the name of the plugin
|
||||
data.put("pluginVersion", pluginVersion); // Append the version of the plugin
|
||||
JSONArray customCharts = new JSONArray();
|
||||
data.put("customCharts", customCharts);
|
||||
|
||||
return data;
|
||||
}
|
||||
|
||||
/**
|
||||
* Gets the server specific data.
|
||||
*
|
||||
* @return The server specific data.
|
||||
*/
|
||||
private JSONObject getServerData() {
|
||||
// Minecraft specific data
|
||||
int playerAmount = Bukkit.getOnlinePlayers().size();
|
||||
int onlineMode = Bukkit.getOnlineMode() ? 1 : 0;
|
||||
String bukkitVersion = Bukkit.getVersion();
|
||||
bukkitVersion = bukkitVersion.substring(bukkitVersion.indexOf("MC: ") + 4, bukkitVersion.length() - 1);
|
||||
|
||||
// OS/Java specific data
|
||||
String javaVersion = System.getProperty("java.version");
|
||||
String osName = System.getProperty("os.name");
|
||||
String osArch = System.getProperty("os.arch");
|
||||
String osVersion = System.getProperty("os.version");
|
||||
int coreCount = Runtime.getRuntime().availableProcessors();
|
||||
|
||||
JSONObject data = new JSONObject();
|
||||
|
||||
data.put("serverUUID", serverUUID);
|
||||
|
||||
data.put("playerAmount", playerAmount);
|
||||
data.put("onlineMode", onlineMode);
|
||||
data.put("bukkitVersion", bukkitVersion);
|
||||
|
||||
data.put("javaVersion", javaVersion);
|
||||
data.put("osName", osName);
|
||||
data.put("osArch", osArch);
|
||||
data.put("osVersion", osVersion);
|
||||
data.put("coreCount", coreCount);
|
||||
|
||||
return data;
|
||||
}
|
||||
|
||||
/**
|
||||
* Collects the data and sends it afterwards.
|
||||
*/
|
||||
private void submitData() {
|
||||
final JSONObject data = getServerData();
|
||||
|
||||
JSONArray pluginData = new JSONArray();
|
||||
// Search for all other bStats Metrics classes to get their plugin data
|
||||
for (Class<?> service : Bukkit.getServicesManager().getKnownServices()) {
|
||||
try {
|
||||
service.getField("B_STATS_VERSION"); // Our identifier :)
|
||||
} catch (NoSuchFieldException ignored) {
|
||||
continue; // Continue "searching"
|
||||
}
|
||||
// Found one!
|
||||
try {
|
||||
pluginData.add(service.getMethod("getPluginData").invoke(Bukkit.getServicesManager().load(service)));
|
||||
} catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException ignored) { }
|
||||
}
|
||||
|
||||
data.put("plugins", pluginData);
|
||||
|
||||
// Create a new thread for the connection to the bStats server
|
||||
new Thread(new Runnable() {
|
||||
@Override
|
||||
public void run() {
|
||||
try {
|
||||
// Send the data
|
||||
sendData(data);
|
||||
} catch (Exception e) {
|
||||
// Something went wrong! :(
|
||||
if (logFailedRequests) {
|
||||
plugin.getLogger().log(Level.WARNING, "Could not submit plugin stats of " + plugin.getName(), e);
|
||||
}
|
||||
}
|
||||
}
|
||||
}).start();
|
||||
}
|
||||
|
||||
/**
|
||||
* Sends the data to the bStats server.
|
||||
*
|
||||
* @param data The data to send.
|
||||
* @throws Exception If the request failed.
|
||||
*/
|
||||
private static void sendData(JSONObject data) throws Exception {
|
||||
if (data == null) {
|
||||
throw new IllegalArgumentException("Data cannot be null!");
|
||||
}
|
||||
if (Bukkit.isPrimaryThread()) {
|
||||
throw new IllegalAccessException("This method must not be called from the main thread!");
|
||||
}
|
||||
HttpsURLConnection connection = (HttpsURLConnection) new URL(URL).openConnection();
|
||||
|
||||
// Compress the data to save bandwidth
|
||||
byte[] compressedData = compress(data.toString());
|
||||
|
||||
// Add headers
|
||||
connection.setRequestMethod("POST");
|
||||
connection.addRequestProperty("Accept", "application/json");
|
||||
connection.addRequestProperty("Connection", "close");
|
||||
connection.addRequestProperty("Content-Encoding", "gzip"); // We gzip our request
|
||||
connection.addRequestProperty("Content-Length", String.valueOf(compressedData.length));
|
||||
connection.setRequestProperty("Content-Type", "application/json"); // We send our data in JSON format
|
||||
connection.setRequestProperty("User-Agent", "MC-Server/" + B_STATS_VERSION);
|
||||
|
||||
// Send data
|
||||
connection.setDoOutput(true);
|
||||
DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());
|
||||
outputStream.write(compressedData);
|
||||
outputStream.flush();
|
||||
outputStream.close();
|
||||
|
||||
connection.getInputStream().close(); // We don't care about the response - Just send our data :)
|
||||
}
|
||||
|
||||
/**
|
||||
* Gzips the given String.
|
||||
*
|
||||
* @param str The string to gzip.
|
||||
* @return The gzipped String.
|
||||
* @throws IOException If the compression failed.
|
||||
*/
|
||||
private static byte[] compress(final String str) throws IOException {
|
||||
if (str == null) {
|
||||
return null;
|
||||
}
|
||||
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
|
||||
GZIPOutputStream gzip = new GZIPOutputStream(outputStream);
|
||||
gzip.write(str.getBytes("UTF-8"));
|
||||
gzip.close();
|
||||
return outputStream.toByteArray();
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,4 +1,4 @@
|
||||
name: StaffChat
|
||||
authors: [oskar3123]
|
||||
main: me.oskar3123.staffchat.bungee.BungeeMain
|
||||
version: 1.1.0
|
||||
version: 1.1.1
|
||||
|
||||
@@ -1,7 +1,7 @@
|
||||
name: StaffChat
|
||||
authors: [oskar3123]
|
||||
main: me.oskar3123.staffchat.spigot.Main
|
||||
version: 1.1.0
|
||||
version: 1.1.1
|
||||
|
||||
commands:
|
||||
staffchat:
|
||||
|
||||
Reference in New Issue
Block a user