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Metrics.java
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Metrics.java
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/*
* 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.griefcraft.util;
import com.griefcraft.lwc.LWC;
import org.bukkit.Bukkit;
import org.bukkit.plugin.Plugin;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.LinkedList;
import java.util.List;
import java.util.UUID;
/**
* Tooling to post to metrics.griefcraft.com
*/
public class Metrics {
/**
* The base url of the metrics domain
*/
private static final String BASE_URL = "http://metrics.griefcraft.com";
/**
* The url used to report a server's status
*/
private static final String REPORT_URL = "/report/%s";
/**
* Object that pings the server every so often
*/
private final Ping ping = new Ping();
/**
* Unique server id
*/
private String guid;
public Metrics() {
loadGUID();
}
/**
* Plugin-specific code to load the server's guid
*/
private void loadGUID() {
LWC lwc = LWC.getInstance();
// Attempt to load an existing guid
guid = lwc.getPhysicalDatabase().getInternal("guid");
// if it's still null we need to create one
if (guid == null) {
// Generate it directly into the database to guarantee it saves
lwc.getPhysicalDatabase().setInternal("guid", UUID.randomUUID().toString());
// and then load it from the database again
guid = lwc.getPhysicalDatabase().getInternal("guid");
}
}
/**
* Begin measuring a plugin
*
* @param plugin
*/
public void beginMeasuringPlugin(Plugin plugin) throws IOException {
ping.addPlugin(plugin);
postPlugin(plugin, false);
}
/**
* Generic method that posts a plugin to the metrics website
*
* @param plugin
*/
private void postPlugin(Plugin plugin, boolean isPing) throws IOException {
// Construct the post data
String response = "ERR No response";
String data = encode("guid") + "=" + encode(guid)
+ "&" + encode("version") + "=" + encode(plugin.getDescription().getVersion())
+ "&" + encode("server") + "=" + encode(Bukkit.getVersion())
+ "&" + encode("players") + "=" + encode(Bukkit.getServer().getOnlinePlayers().length + "");
// If we're pinging, append it
if (isPing) {
data += "&" + encode("ping") + "=" + encode("true");
}
// Create the url
URL url = new URL(BASE_URL + String.format(REPORT_URL, plugin.getDescription().getName()));
// Connect to the website
URLConnection connection = url.openConnection();
connection.setDoOutput(true);
// Write the data
OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
writer.write(data);
writer.flush();
// Now read the response
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
response = reader.readLine();
// close resources
writer.close();
reader.close();
if (response.startsWith("OK")) {
// Useless return, but it documents that we should be receiving OK followed by an optional description
return;
} else if (response.startsWith("ERR")) {
// Throw it to whoever is catching us
throw new IOException(response);
}
}
/**
* Encode text as UTF-8
*
* @param text
* @return
*/
private String encode(String text) throws UnsupportedEncodingException {
return URLEncoder.encode(text, "UTF-8");
}
/**
* Periodically runs the metrics tool
*/
private final class Ping implements Runnable {
/**
* Interval of time to ping in minutes
*/
private final static int PING_INTERVAL = 10;
/**
* List of plugins to send stats for.
* Must be manually synchronized.
*/
private final List<Plugin> plugins = new LinkedList<Plugin>();
/**
* The last time the server was pinged.
* We don't want to immediately ping
*/
private long lastPing = System.currentTimeMillis();
public Ping() {
new Thread(this).start();
}
public void run() {
// convert the interval in milliseconds
final long intervalMillis = PING_INTERVAL * 60 * 1000L;
while (true) {
// Have we reached the interval?
if (System.currentTimeMillis() - lastPing > intervalMillis) {
lastPing = System.currentTimeMillis();
// Post each plugin
synchronized (plugins) {
for (Plugin plugin : plugins) {
try {
postPlugin(plugin, true);
} catch (IOException e) {
System.out.println("[Metrics] " + e);
}
}
}
}
try {
Thread.sleep(2500L);
} catch (InterruptedException e) { }
}
}
/**
* Add a plugin to be updated every so often
* @param plugin
*/
public void addPlugin(Plugin plugin) {
synchronized (plugins) {
if (!plugins.contains(plugin)) {
plugins.add(plugin);
}
}
}
}
}