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Track previous version and report in command 

It is often difficult to diagnose new issues server admins get when
upgrading to a new server version because the only information they are
able to tell us regarding the server version they are running is
"latest". This commit attempts to mitigate this by keeping track of the
previous version of Paper they were running, which is then reported by
the `/version` or `/paper version` command. This gives us a better idea
of the commits included in the upgrade, which may help diagnose new
issues easier.
This commit is contained in:
Kyle Wood 2018-03-01 19:57:22 -06:00 committed by Zach Brown
parent d4c3e49a06
commit 35b4136815
No known key found for this signature in database
GPG Key ID: CC9DA35FC5450B76
2 changed files with 222 additions and 0 deletions
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201
Spigot-API-Patches/0096-Add-version-history-to-version-command.patch Normal file
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@ -0,0 +1,201 @@
From 84c3f00cdbeec9be41433470a4b0eef250e37e91 Mon Sep 17 00:00:00 2001
From: Kyle Wood <demonwav@gmail.com>
Date: Thu, 1 Mar 2018 19:37:52 -0600
Subject: [PATCH] Add version history to version command
diff --git a/src/main/java/com/destroystokyo/paper/VersionHistoryManager.java b/src/main/java/com/destroystokyo/paper/VersionHistoryManager.java
new file mode 100644
index 00000000..1daaca2f
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/VersionHistoryManager.java
@@ -0,0 +1,143 @@
+package com.destroystokyo.paper;
+
+import com.google.common.base.MoreObjects;
+import com.google.gson.Gson;
+import com.google.gson.JsonSyntaxException;
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.util.Objects;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javax.annotation.Nullable;
+import org.bukkit.Bukkit;
+
+public enum VersionHistoryManager {
+ INSTANCE;
+
+ private final Gson gson = new Gson();
+
+ private final Logger logger = Bukkit.getLogger();
+
+ private VersionData currentData = null;
+
+ VersionHistoryManager() {
+ final Path path = Paths.get("version_history.json");
+
+ if (Files.exists(path)) {
+ // Basic file santiy checks
+ if (!Files.isRegularFile(path)) {
+ if (Files.isDirectory(path)) {
+ logger.severe(path + " is a directory, cannot be used for version history");
+ } else {
+ logger.severe(path + " is not a regular file, cannot be used for version history");
+ }
+ // We can't continue
+ return;
+ }
+
+ try (final BufferedReader reader = Files.newBufferedReader(path, StandardCharsets.UTF_8)) {
+ currentData = gson.fromJson(reader, VersionData.class);
+ } catch (final IOException e) {
+ logger.log(Level.SEVERE, "Failed to read version history file '" + path + "'", e);
+ return;
+ } catch (final JsonSyntaxException e) {
+ logger.log(Level.SEVERE, "Invalid json syntax for file '" + path + "'", e);
+ return;
+ }
+
+ final String version = Bukkit.getVersion();
+ if (version == null) {
+ logger.severe("Failed to retrieve current version");
+ return;
+ }
+
+ if (!version.equals(currentData.getCurrentVersion())) {
+ // The version appears to have changed
+ currentData.setOldVersion(currentData.getCurrentVersion());
+ currentData.setCurrentVersion(version);
+ writeFile(path);
+ }
+ } else {
+ // File doesn't exist, start fresh
+ currentData = new VersionData();
+ // oldVersion is null
+ currentData.setCurrentVersion(Bukkit.getVersion());
+ writeFile(path);
+ }
+ }
+
+ private void writeFile(final Path path) {
+ try (final BufferedWriter writer = Files.newBufferedWriter(
+ path,
+ StandardCharsets.UTF_8,
+ StandardOpenOption.WRITE,
+ StandardOpenOption.CREATE,
+ StandardOpenOption.TRUNCATE_EXISTING
+ )) {
+ gson.toJson(currentData, writer);
+ } catch (final IOException e) {
+ logger.log(Level.SEVERE, "Failed to write to version history file", e);
+ }
+ }
+
+ @Nullable
+ public VersionData getVersionData() {
+ return currentData;
+ }
+
+ public class VersionData {
+ private String oldVersion;
+
+ private String currentVersion;
+
+ @Nullable
+ public String getOldVersion() {
+ return oldVersion;
+ }
+
+ public void setOldVersion(@Nullable String oldVersion) {
+ this.oldVersion = oldVersion;
+ }
+
+ @Nullable
+ public String getCurrentVersion() {
+ return currentVersion;
+ }
+
+ public void setCurrentVersion(@Nullable String currentVersion) {
+ this.currentVersion = currentVersion;
+ }
+
+ @Override
+ public String toString() {
+ return MoreObjects.toStringHelper(this)
+ .add("oldVersion", oldVersion)
+ .add("currentVersion", currentVersion)
+ .toString();
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) {
+ return true;
+ }
+ if (o == null || getClass() != o.getClass()) {
+ return false;
+ }
+ final VersionData versionData = (VersionData) o;
+ return Objects.equals(oldVersion, versionData.oldVersion) &&
+ Objects.equals(currentVersion, versionData.currentVersion);
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(oldVersion, currentVersion);
+ }
+ }
+}
diff --git a/src/main/java/org/bukkit/command/defaults/VersionCommand.java b/src/main/java/org/bukkit/command/defaults/VersionCommand.java
index 044361af..c45faf4c 100644
--- a/src/main/java/org/bukkit/command/defaults/VersionCommand.java
+++ b/src/main/java/org/bukkit/command/defaults/VersionCommand.java
@@ -31,6 +31,7 @@ import org.json.simple.parser.ParseException;
// Paper start
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
+import com.destroystokyo.paper.VersionHistoryManager;
// Paper end
public class VersionCommand extends BukkitCommand {
@@ -49,6 +50,7 @@ public class VersionCommand extends BukkitCommand {
if (args.length == 0) {
sender.sendMessage("This server is running " + Bukkit.getName() + " version " + Bukkit.getVersion() + " (Implementing API version " + Bukkit.getBukkitVersion() + ")");
+ tellHistory(sender); // Paper
sendVersion(sender);
} else {
StringBuilder name = new StringBuilder();
@@ -85,6 +87,22 @@ public class VersionCommand extends BukkitCommand {
return true;
}
+ // Paper start - show version history
+ private void tellHistory(final CommandSender sender) {
+ final VersionHistoryManager.VersionData data = VersionHistoryManager.INSTANCE.getVersionData();
+ if (data == null) {
+ return;
+ }
+
+ final String oldVersion = data.getOldVersion();
+ if (oldVersion == null) {
+ return;
+ }
+
+ sender.sendMessage("Previous version: " + oldVersion);
+ }
+ // Paper end
+
private void describeToSender(Plugin plugin, CommandSender sender) {
PluginDescriptionFile desc = plugin.getDescription();
sender.sendMessage(ChatColor.GREEN + desc.getName() + ChatColor.WHITE + " version " + ChatColor.GREEN + desc.getVersion());
--
2.17.0

21
Spigot-Server-Patches/0288-Load-version-history-at-server-start.patch Normal file
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@ -0,0 +1,21 @@
From 021716c338c60c29f5080847c508a2f6441bd08e Mon Sep 17 00:00:00 2001
From: Kyle Wood <demonwav@gmail.com>
Date: Thu, 1 Mar 2018 19:38:14 -0600
Subject: [PATCH] Load version history at server start
diff --git a/src/main/java/net/minecraft/server/DedicatedServer.java b/src/main/java/net/minecraft/server/DedicatedServer.java
index 85445571..39a3d46f 100644
--- a/src/main/java/net/minecraft/server/DedicatedServer.java
+++ b/src/main/java/net/minecraft/server/DedicatedServer.java
@@ -203,6 +203,7 @@ public class DedicatedServer extends MinecraftServer implements IMinecraftServer
// Paper start
com.destroystokyo.paper.PaperConfig.init((File) options.valueOf("paper-settings"));
com.destroystokyo.paper.PaperConfig.registerCommands();
+ com.destroystokyo.paper.VersionHistoryManager.INSTANCE.getClass(); // load version history now
// Paper end
DedicatedServer.LOGGER.info("Generating keypair");
--
2.17.0