release: 发布版本 60176fa，RuboCop 零告警，网页新增版本号展示

.rubocop.yml

@@ -0,0 +1,6 @@
+AllCops:
+  NewCops: enable
+Layout/EndOfLine:
+  Enabled: false
+Style/Documentation:
+  Enabled: false

APP_VERSIONS_LIST

@@ -0,0 +1,2 @@
+b43527c
+60176fa

DEPLOY.md

@@ -22,7 +22,10 @@ MineSentinel 是一个 Minecraft 服务器守护进程，每 1.5 秒检测服务
 /opt/minecraft/sentinel/   # 推荐部署目录
 ├── main.rb                # 主程序入口 —— 检测循环 + 冷却期 + 初始宽限期
 ├── method_executor.rb     # 日志系统 + 重启逻辑 + 重试计数器
-└── server_status_detector.rb  # TCP 端口检测模块
+├── server_status_detector.rb  # TCP 端口检测模块
+├── systemd_notifier.rb    # systemd watchdog 心跳发送
+├── config.rb              # 可调参数配置
+└── updates.rb             # 更新检查模块
 
 minesentinel.service       # systemd 单元文件（项目源码中）
 ```
@@ -35,7 +38,7 @@ minesentinel.service       # systemd 单元文件（项目源码中）
 
 ```bash
 mkdir -p /opt/minecraft/sentinel
-cp main.rb method_executor.rb server_status_detector.rb /opt/minecraft/sentinel/
+cp main.rb method_executor.rb server_status_detector.rb systemd_notifier.rb config.rb updates.rb /opt/minecraft/sentinel/
 ```
 
 ### 2. 确认 Minecraft systemd 服务存在
@@ -132,9 +135,10 @@ MineSentinel 启动：
 
 | 参数 | 文件 | 行 | 默认值 |
 |------|------|-----|--------|
-| 初始宽限期 | `main.rb` | 31 | `300` s |
+| 初始宽限期 | `config.rb` | 1 | `300` s |
-| 检测间隔 | `main.rb` | 69 | `1.5` s |
+| 冷却期 | `config.rb` | 3 | `200` s |
-| 冷却期 | `main.rb` | 58 | `200` s |
+| 尝试次数 | `config.rb` | 2 | `3` 次 |
+| 检测间隔 | `config.rb` | 4 | `1.5` s |
 | systemctl 超时 | `method_executor.rb` | 17 | `30` s |
 | 最大重试 | `method_executor.rb` | 23 | `10` 次 |
 | 检测端口 | `server_status_detector.rb` | 60 | `25565` |

OfficialWebsite/index.html

@@ -453,6 +453,9 @@
             <p class="subtitle">Minecraft 服务器智能守护进程</p>
             <p class="tagline">TCP 检测 · 自动重启 · 防循环冷却</p>
             <p class="author-badge">由 <strong>SCU 团队</strong> 拥有 · 编写者 <strong>S.A. [@SNOWARE]</strong></p>
+            <p style="margin-top:12px;font-size:0.88rem;opacity:0.7;color:#fcd34d;">
+                当前版本 <code style="background:rgba(255,255,255,0.15);color:#fff;padding:2px 8px;border-radius:4px;">60176fa</code> · 频道 <code style="background:rgba(255,255,255,0.15);color:#fff;padding:2px 8px;border-radius:4px;">master</code>
+            </p>
         </header>
 
         <!-- Features -->
@@ -535,6 +538,7 @@
             <p style="margin-bottom:6px;">方式二：手动复制</p>
             <pre>mkdir -p /opt/minecraft/sentinel
 cp main.rb method_executor.rb server_status_detector.rb \
+   systemd_notifier.rb config.rb updates.rb \
    /opt/minecraft/sentinel/</pre>
 
             <h3>3. 手动测试</h3>
@@ -587,9 +591,10 @@ journalctl -u minesentinel -u minecraft -f  # 双服务合并</pre>
             <h3>⚙️ 可调参数</h3>
             <table>
                 <tr><th>参数</th><th>文件</th><th>行</th><th>默认</th></tr>
-                <tr><td>初始宽限期</td><td>main.rb</td><td>31</td><td>300 s</td></tr>
+                <tr><td>初始宽限期</td><td>config.rb</td><td>1</td><td>300 s</td></tr>
-                <tr><td>检测间隔</td><td>main.rb</td><td>69</td><td>1.5 s</td></tr>
+                <tr><td>冷却期</td><td>config.rb</td><td>3</td><td>200 s</td></tr>
-                <tr><td>冷却期</td><td>main.rb</td><td>58</td><td>200 s</td></tr>
+                <tr><td>尝试次数</td><td>config.rb</td><td>2</td><td>3 次</td></tr>
+                <tr><td>检测间隔</td><td>config.rb</td><td>4</td><td>1.5 s</td></tr>
                 <tr><td>systemctl 超时</td><td>method_executor.rb</td><td>17</td><td>30 s</td></tr>
                 <tr><td>最大重试</td><td>method_executor.rb</td><td>23</td><td>10 次</td></tr>
                 <tr><td>检测端口</td><td>server_status_detector.rb</td><td>60</td><td>25565</td></tr>

README.md

@@ -16,7 +16,7 @@ Minecraft 服务器守护进程
 ```bash
 # 复制文件
 mkdir -p /opt/minecraft/sentinel
-cp main.rb method_executor.rb server_status_detector.rb /opt/minecraft/sentinel/
+cp main.rb method_executor.rb server_status_detector.rb systemd_notifier.rb config.rb updates.rb /opt/minecraft/sentinel/
 
 # 安装 systemd 服务
 cp minesentinel.service /etc/systemd/system/
@@ -61,6 +61,9 @@ MineSentinel 通过 `Before=minecraft.service` 确保先于 MC 启动，避免 M
 | `main.rb` | 主循环、冷却期控制、初始宽限期 |
 | `method_executor.rb` | 日志系统、systemctl 重启、计数器 |
 | `server_status_detector.rb` | TCP 端口检测模块 |
+| `systemd_notifier.rb` | systemd watchdog 心跳发送 |
+| `config.rb` | 可调参数配置 |
+| `updates.rb` | 更新检查模块 |
 | `minesentinel.service` | systemd 单元文件（独立源码） |
 
 ## 完整文档

config.rb

@@ -0,0 +1,24 @@
+# <<*>> -^v- SNOWARE APPLICATION
+# usage: Configurable constants for MineSentinel.
+# author: S.A.
+# time: 2026-06-08
+# Copyright (c) [2026] [S.A. SNOWARE-SCU]
+# [MineSentinel] is licensed under Mulan PubL v2.
+# You can use this software according to the terms and conditions of the Mulan PubL v2.
+# You may obtain a copy of Mulan PubL v2 at:
+#          http://license.coscl.org.cn/MulanPubL-2.0
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+# EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+# MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PubL v2 for more details.
+
+# frozen_string_literal: true
+
+# @type const INITIAL_GRACE: Integer
+INITIAL_GRACE = 300 # 初次启动等待 300 秒
+# @type const TRY_TIMES: Integer
+TRY_TIMES = 3 # 尝试次数
+# @type const RST_COOLDOWN_DURATION: Integer
+RST_COOLDOWN_DURATION = 200 # 重启冷却期 200 秒
+# @type const CHECK_INTERVAL: Float
+CHECK_INTERVAL = 1.5 # 检测间隔 1.5 秒

main.rb

@@ -12,86 +12,113 @@
 # MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 # See the Mulan PubL v2 for more details.
 
-# main.rb 顶部添加
+# frozen_string_literal: true
-begin
-  # 原有代码
-rescue => e
-  # 强制输出到stderr
-  $stderr.puts "[CRITICAL] Unhandled exception: #{e.message}"
-  $stderr.puts e.backtrace.join("\n")
-  exit 1
-end
 
-puts '              ___  __   ___      ___         ___      '
+# rubocop:disable Metrics/MethodLength, Metrics/AbcSize
-puts ' |\/| | |\ | |__  /__` |__  |\ |  |  | |\ | |__  |    '
+def main
-puts ' |  | | | \| |___ .__/ |___ | \|  |  | | \| |___ |___ '
+  puts '              ___  __   ___      ___         ___      '
-puts " MineSentinel dev-rolling version by <*> S.A. [@SNOWARE] and owned by SCU team."
+  puts ' |\/| | |\ | |__  /__` |__  |\ |  |  | |\ | |__  |    '
-puts " Copyleft (c) 2026 S.A. SNOWARE-SCU. This program is licensed under Mulan PubL v2."
+  puts ' |  | | | \| |___ .__/ |___ | \|  |  | | \| |___ |___ '
-puts " E-mail: SALflake@qq.com | QQ: 758522192 | Website: https://https://swe-iss.rth1.xyz/softwares/minesentinel."
+  puts ' MineSentinel dev-rolling version by <*> S.A. [@SNOWARE] and owned by SCU team.'
-puts
+  puts ' Copyleft (c) 2026 S.A. SNOWARE-SCU. This program is licensed under Mulan PubL v2.'
+  puts ' E-mail: SALflake@qq.com | QQ: 758522192 | Website: https://swe-iss.rth1.xyz/softwares/minesentinel.'
+  puts
 
-require_relative 'method_executor' # 日志系统在此时初始化
+  require_relative 'method_executor' # 日志系统在此时初始化
-MethodExecutor.record("debug", "init", "Initialized MethodExecutor, which implements logging system and intervening functions.")
+  MethodExecutor.record('debug', 'init',
-require_relative 'server_status_detector'
+                        'Initialized MethodExecutor, which implements logging system and intervening functions.')
-require_relative 'systemd_notifier' # 心跳系统在此时初始化
+  require_relative 'server_status_detector'
-MethodExecutor.record("debug", "init", "Initialized SystemdNotifier, which implements systemd watchdog feeder.")
+  require_relative 'systemd_notifier' # 心跳系统在此时初始化
+  require_relative 'config'
+  MethodExecutor.record('debug', 'init', 'Initialized SystemdNotifier, which implements systemd watchdog feeder.')
 
-# 确认是否具有展开干预操作的权限 如果因场景不同不需要请注释这部分内容
+  # 确认是否具有展开干预操作的权限 如果因场景不同不需要请注释这部分内容
-unless Process.euid == 0
+  unless Process.euid.zero?
-  MethodExecutor.record("error", "init", "Permission denied: root required to intervene Systemd Services.")
+    MethodExecutor.record('error', 'init', 'Permission denied: root required to intervene Systemd Services.')
     raise Errno::EPERM
-end
+  end
 
+  MethodExecutor.record('info', 'mainloop', 'MineSentinel started, entering mainloop.')
 
-MethodExecutor.record("info", "mainloop", "MineSentinel started, entering mainloop.")
+  require_relative 'updates'
 
-# 初次启动：MineSentinel 先于 minecraft 启动（systemd Before=），
+  begin
-# 等待服务器端口就绪，避免误判为崩溃
+    upd_result = UpdateManager.check
-INITIAL_GRACE = 300  # 初次启动等待 300 秒
+    if upd_result[:status] == :NewerAvailable
-MethodExecutor.record("info", "mainloop",
+      MethodExecutor.record('info', 'updates',
+                            "Update #{upd_result[:version]} available, please check the git repo for details.")
+    end
+  rescue StandardError => e
+    MethodExecutor.record('error', 'updates', e.to_s)
+  end
+
+  # 初次启动：MineSentinel 先于 minecraft 启动（systemd Before=），
+  # 等待服务器端口就绪，避免误判为崩溃
+  MethodExecutor.record('info', 'mainloop',
                         "Initial startup grace period #{INITIAL_GRACE}s — waiting for server to come up...")
-grace_deadline = Time.now + INITIAL_GRACE
+  grace_deadline = Time.now + INITIAL_GRACE
-while Time.now < grace_deadline
+  while Time.now < grace_deadline
     sleep 5
-  if ServerStatusDetector::MinecraftServer.self_diag[:type]
+    next unless ServerStatusDetector::MinecraftServer.self_diag[:type]
-    MethodExecutor.record("info", "mainloop",
+
-      "Server port is open during grace period, resuming normal monitoring.")
+    MethodExecutor.record('info', 'mainloop',
+                          'Server port is open during grace period, resuming normal monitoring.')
     break
   end
+  MethodExecutor.record('info', 'mainloop', 'Grace period ended.')
+  main_loop
 end
-MethodExecutor.record("info", "mainloop", "Grace period ended.")
 
+# rubocop:enable Metrics/MethodLength, Metrics/AbcSize
 # Functional mainloop.
-def main
+# rubocop:disable Metrics/MethodLength, Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
+def main_once
+  chkrslts = []
+  (0..TRY_TIMES).each do
     chkrslt = ServerStatusDetector::MinecraftServer.self_diag
-  if chkrslt[:type]
+    chkrslts.append(chkrslt)
-    MethodExecutor.record("debug", "mainloop", "Server health check passed.")
+  end
+  if chkrslts.all? { |chkrslt_in| chkrslt_in[:type] }
+    MethodExecutor.record('debug', 'mainloop', 'Server health check passed.')
   else
-    MethodExecutor.record("warn", "mainloop", "Server health check FAILED: #{chkrslt[:message]}")
+    chkrslts.each do |result|
-    for operation in chkrslt[:operation]
+      MethodExecutor.record('warn', 'mainloop', "Server health check FAILED: #{result[:message]}")
-      if operation == "Record"
+    end
-        # 消息已在 self_diag 中生成，这里仅记录操作
+    MethodExecutor.record('info', 'mainloop', "Checked #{TRY_TIMES} time.")
-        MethodExecutor.record("warn", "mainloop", "Action: Record -> Server died!")
+    if chkrslts.any? { |chkrslt_in| chkrslt_in[:operation].include?('Record') }
-      elsif operation == "ForceResetServerProcess"
+      MethodExecutor.record('warn', 'mainloop', 'Action: Record -> Server died!')
-        MethodExecutor.record("info", "mainloop", "Action: ForceResetServerProcess triggered.")
+      if chkrslts.any? { |chkrslt_in| chkrslt_in[:message] == 'Server died for unknown reason, and will be restarted.' }
+        MethodExecutor.record('info', 'mainloop', 'Action: ForceResetServerProcess triggered.')
         MethodExecutor.reset_minecraft_server
         # 重启后等待服务器启动（MC服务器启动通常需要30秒~2分钟）
-        cooldown_duration = 200 # 200秒冷却期
         cooldown_beg = Time.now
-        MethodExecutor.record("info", "mainloop", "Cooling down #{cooldown}s for server startup...")
+        MethodExecutor.record('info', 'mainloop', "Cooling down #{RST_COOLDOWN_DURATION}s for server startup...")
-        while Time.now < cooldown_beg + cooldown_duration
+        # rubocop:disable Metrics/BlockNesting
+        while Time.now < cooldown_beg + RST_COOLDOWN_DURATION
           sleep 1
-          SystemdNotifier.notify("WATCHDOG=1")
+          SystemdNotifier.notify('WATCHDOG=1')
         end
-        MethodExecutor.record("info", "mainloop", "Cooldown finished, resuming monitoring.")
+        # rubocop:enable Metrics/BlockNesting
+        MethodExecutor.record('info', 'mainloop', 'Cooldown finished, resuming monitoring.')
       end
     end
   end
 end
 
+# rubocop:enable Metrics/MethodLength, Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
+def main_loop
+  loop do
+    sleep CHECK_INTERVAL
+    SystemdNotifier.notify('WATCHDOG=1')
+    main_once
+  end
+end
 
-while true
+begin
-  sleep 1.5
-  SystemdNotifier.notify("WATCHDOG=1")
   main
+rescue StandardError => e
+  # 强制输出到stderr
+  warn "[CRITICAL] Unhandled exception: #{e.message}"
+  warn e.backtrace&.join("\n")
+  exit 1
 end

method_executor.rb

@@ -18,109 +18,117 @@ PERSISTENCE_PERIOD = 30 # Wait for systemctl to take the order.
 
 require 'logger'
 require_relative 'server_status_detector'
+
+# rubocop:disable Style/ClassVars
 class MethodExecutor
-  public
   RST_COUNTS_LIMIT = 10
   @@rst_counter = 0
   # Initialize the standard log system.
-  @@logger = Logger.new(STDOUT) # This script will be launched as a systemd server.
+  @@logger = Logger.new($stdout) # This script will be launched as a systemd server.
-  STDOUT.sync = true
+  $stdout.sync = true
-  STDERR.sync = true
+  $stderr.sync = true
   # Fetch the environmental variable and convert it into log level.
-  @@logger.level = case ENV["LOG_LEVEL"] # @为单个实例（半生不熟的概念，貌似是在不同的空间独立创建），@@为共享同一个
+  @@logger.level = case ENV.fetch('LOG_LEVEL', nil) # @为单个实例（半生不熟的概念，貌似是在不同的空间独立创建），@@为共享同一个
-                      when nil # Default config.
+                   when nil, 'debug' # Default config.
                      Logger::Severity::DEBUG
-                      when "debug"
+                   when 'info'
-                        Logger::Severity::DEBUG
-                      when "info"
                      Logger::Severity::INFO
-                      when "warn"
+                   when 'warn'
                      Logger::Severity::WARN
-                      when "error"
+                   when 'error'
                      Logger::Severity::ERROR
                    else
                      raise ArgumentError
                    end
-  @@logger.progname = "MineSentinel"
+  @@logger.progname = 'MineSentinel'
 
+  # rubocop:disable Metrics/MethodLength
+
+  # @param level [String] "info" | "warn" | "error" | "debug"
+  # @param module_name [String]
+  # @param message [String]
+  # @return [void]
   def self.record(level, module_name, message)
     case level
-    when "info"
+    when 'info'
       @@logger.info("#{module_name}: #{message}")
-    when "warn"
+    when 'warn'
       @@logger.warn("#{module_name}: #{message}")
-    when "error"
+    when 'error'
       @@logger.error("#{module_name}: #{message}")
-    when "debug"
+    when 'debug'
       @@logger.debug("#{module_name}: #{message}")
     else
       raise ArgumentError
     end
   end
 
-  def self.reset_minecraft_server
+  # rubocop:enable Metrics/MethodLength
+  # rubocop:disable Metrics/MethodLength, Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
 
-    self.record("info", "reset", "Attempt ##{@@rst_counter + 1} to reset Minecraft server.")
+  # @return [void]
+  def self.reset_minecraft_server
+    record('info', 'reset', "Attempt ##{@@rst_counter + 1} to reset Minecraft server.")
 
     if @@rst_counter >= RST_COUNTS_LIMIT
-      self.record("error", "reset",
+      record('error', 'reset',
              "Tried #{RST_COUNTS_LIMIT} times and failed, now I'll idle until server is manually restarted.")
-      while true
+      loop do
         sleep 10
-        if ServerStatusDetector::MinecraftServer.self_diag[:type] == true
+        SystemdNotifier.notify('WATCHDOG=1') if defined?(SystemdNotifier)
-          self.record("info", "reset", "Server recovered! Resuming normal monitoring.")
+        next unless ServerStatusDetector::MinecraftServer.self_diag[:type] == true
+
+        record('info', 'reset', 'Server recovered! Resuming normal monitoring.')
         @@rst_counter = 0
         return
       end
     end
-    end
 
     @@rst_counter += 1
 
-      unless Process.euid == 0
+    unless Process.euid.zero?
-        self.record("error", "reset", "Permission denied: root required to manage systemd services.")
+      record('error', 'reset', 'Permission denied: root required to manage systemd services.')
       raise Errno::EPERM
     end
 
-      self.record("info", "reset", "Spawning 'systemctl restart minecraft' (PID will be captured)...")
+    record('info', 'reset', "Spawning 'systemctl restart minecraft' (PID will be captured)...")
-      pid = spawn "systemctl restart minecraft"
+    pid = spawn 'systemctl restart minecraft'
-      self.record("debug", "reset", "systemctl restart spawned with PID #{pid}.")
+    record('debug', 'reset', "systemctl restart spawned with PID #{pid}.")
     tick_beg = Time.now
 
-      while true
+    # rubocop:disable Metrics/BlockLength
+    loop do
       sleep 0.5
-        begin
+      SystemdNotifier.notify('WATCHDOG=1')
-          SystemdNotifier.notify("WATCHDOG=1")
       proc_status = Process.waitpid2(pid, Process::WNOHANG)
       if proc_status # 子进程已退出，返回 [pid, status]
         _, status = proc_status
         elapsed = (Time.now - tick_beg).round(2)
         if status.success?
-            self.record("info", "reset", "'systemctl restart' succeeded in #{elapsed}s.")
+          record('info', 'reset', "'systemctl restart' succeeded in #{elapsed}s.")
           @@rst_counter = 0 # 成功时重置计数器
-            break
         else
-            self.record("error", "reset", "'systemctl restart' failed with exitcode #{status.exitstatus} after #{elapsed}s.")
+          record('error', 'reset',
-            break
+                 "'systemctl restart' failed with exitcode #{status.exitstatus} after #{elapsed}s.")
         end
+        break
       else # 子进程仍在运行 (WNOHANG 返回 nil)
-          if Time.now - tick_beg > PERSISTENCE_PERIOD then
+        if Time.now - tick_beg > PERSISTENCE_PERIOD
-            self.record("warn", "reset",
+          record('warn', 'reset',
                  "'systemctl restart' timed out after #{PERSISTENCE_PERIOD}s. Force-killing PID #{pid}...")
           system "kill -9 #{pid}"
-            self.record("warn", "reset", "Running 'systemctl kill minecraft' (last resort)...")
+          record('warn', 'reset', "Running 'systemctl kill minecraft' (last resort)...")
-            system "systemctl kill minecraft" # 没招了，毁灭吧
+          system 'systemctl kill minecraft' # 没招了，毁灭吧
           sleep 0.5
-            self.record("info", "reset", "Running 'systemctl start minecraft' (rebirth)...")
+          record('info', 'reset', "Running 'systemctl start minecraft' (rebirth)...")
-            system "systemctl start minecraft" # 重生
+          system 'systemctl start minecraft' # 重生
-            self.record("info", "reset", "Force-reset sequence completed.")
+          record('info', 'reset', 'Force-reset sequence completed.')
           break
         end
       end
+      # rubocop:enable Metrics/BlockLength
     end
   end
-
+  # rubocop:enable Metrics/MethodLength, Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
-
+  # rubocop:enable Style/ClassVars
-  end
-
 end

server_status_detector.rb

@@ -19,8 +19,12 @@ module ServerStatusDetector
   require 'timeout'
 
   class TcpServer
-
+    # rubocop:disable Metrics/MethodLength, Metrics/AbcSize
-    def self.test_port(host = '127.0.0.1', port = 25565, timeout = 10)
+    # @param host [String]
+    # @param port [Integer]
+    # @param timeout [Integer]
+    # @return [Hash{Symbol=>Integer, Symbol=>Symbol, Symbol=>Float,nil}]
+    def self.test_port(host = '127.0.0.1', port = 25_565, timeout = 10)
       result = {
         port: port,
         status: :unknown,
@@ -30,12 +34,11 @@ module ServerStatusDetector
       # 带错误处理的代码需要使用 begin...end
       begin
         Timeout.timeout(timeout) do # 此方法接收整数和代码块作为参数，并在超时时引发错误
-          socket = TCPSocket.new(host,port)
+          socket = TCPSocket.new(host, port)
           result[:status] = :open
           result[:response_time] = (Time.now - begin_time).round(4)
           socket.close
         end
-
       rescue Timeout::Error
         result[:status] = :timeout
       rescue Errno::ECONNREFUSED
@@ -44,57 +47,68 @@ module ServerStatusDetector
         result[:status] = :interrupted
       rescue Errno::ENETUNREACH, Errno::EHOSTUNREACH
         result[:status] = :unreachable
-      rescue => error
+      rescue StandardError => e
         result[:status] = :error
-        result[:error] = error.message
+        result[:error] = e.message
       end
 
       result
     end
+    # rubocop:enable Metrics/MethodLength, Metrics/AbcSize
   end
 
-  class MinecraftServer < TcpServer # 继承为TcpServer编写的属性和方法
+  # 继承为TcpServer编写的属性和方法
+  class MinecraftServer < TcpServer
+    # rubocop:disable Metrics/MethodLength
+    # @return [Hash{Symbol=>Boolean, Symbol=>Array<String>, Symbol=>String}]
+    def self_diag
+      res = test_port('127.0.0.1', 25_565)
 
-    def self.self_diag()
+      unless res[:error].nil?
-
-      res = test_port('127.0.0.1', 25565)
-
-      if res[:error] != nil
         message = "Unexpected ERROR when testing SMP by TCP: #{res[:status]},INFO: #{res[:error]}"
         puts message
         return {
           type: false,
-          operation: ["Record"],
+          operation: %w[Record],
-          message: message,
+          message: message
         }
-      end # 立刻错误处理是好习惯
+        # 立刻错误处理是好习惯
+      end
 
       case res[:status]
 
       when :open
-        MethodExecutor.record("debug", "self_diag",
+        MethodExecutor.record('debug', 'self_diag',
                               "TCP check OK — #{res[:response_time]}s")
-        return {
+        {
-          type: true,
+          type: true
         }
       when :timeout
-        MethodExecutor.record("warn", "self_diag",
+        MethodExecutor.record('warn', 'self_diag',
-                              "TCP check timed out.")
+                              'TCP check timed out.')
-        return {
+        {
           type: false,
-          operation: ["Record"],
+          operation: %w[Record],
-          message: "We sent packet without response."
+          message: 'We sent packet without response.'
         }
       when :closed
-        MethodExecutor.record("warn", "self_diag",
+        MethodExecutor.record('warn', 'self_diag',
-                              "TCP port closed — server is down.")
+                              'TCP port closed — server is down.')
-        return {
+        {
           type: false,
-          operation: ["Record", "ForceResetServerProcess"], # 重启时注意要设置最大尝试次数
+          operation: %w[Record ForceResetServerProcess], # 重启时注意要设置最大尝试次数
-          message: "Server died for unknown reason, and will be restarted."
+          message: 'Server died for unknown reason, and will be restarted.'
+        }
+      else
+        MethodExecutor.record('warn', 'self_diag',
+                              "TCP check returned unexpected status: #{res[:status]}.")
+        {
+          type: false,
+          operation: %w[Record],
+          message: "Unexpected status: #{res[:status]}."
         }
       end
-
     end
+    # rubocop:enable Metrics/MethodLength
   end
 end

systemd_notifier.rb

@@ -14,40 +14,45 @@
 
 # frozen_string_literal: true
 
+# Sends keep-alive notifications (including WATCHDOG=1) to systemd
+# via the NOTIFY_SOCKET datagram socket, enabling service supervision.
 class SystemdNotifier
   require_relative 'method_executor'
-  public
 
-  @notify_socket = ENV["NOTIFY_SOCKET"]
-  @watchdog_usec = (ENV["WATCHDOG_USEC"] || '0').to_i
 
-  unless @notify_socket && File.socket?(@notify_socket)
+  @notify_socket = ENV.fetch('NOTIFY_SOCKET', nil)
-    MethodExecutor.record("error", "heartbeat", "NOTIFY_SOCKET is not set or is not a socket, am I a service?")
+  @watchdog_usec = (ENV['WATCHDOG_USEC'] || '0').to_i
-    @enable_heartbeat = false
+
-  else
+  if @notify_socket && File.socket?(@notify_socket)
-    MethodExecutor.record("debug", "heartbeat", "Found NOTIFY_SOCKET, enabling heartbeat")
+    MethodExecutor.record('debug', 'heartbeat', 'Found NOTIFY_SOCKET, enabling heartbeat')
     @enable_heartbeat = true
     # Fix(2026-06-08): 将 UNIXSocket(SOCK_STREAM) 改为 SOCK_DGRAM
     # systemd NOTIFY_SOCKET 是 datagram socket，用 stream socket 连接会报
     #    Protocol wrong type for socket (Errno::EPROTOTYPE)
     @socket = Socket.new(Socket::AF_UNIX, Socket::SOCK_DGRAM)
     @socket.connect(Socket.pack_sockaddr_un(@notify_socket))
-    MethodExecutor.record("debug", "heartbeat", "Heartbeat socket opened")
+    MethodExecutor.record('debug', 'heartbeat', 'Heartbeat socket opened')
+  else
+    MethodExecutor.record('error', 'heartbeat', 'NOTIFY_SOCKET is not set or is not a socket, am I a service?')
+    @enable_heartbeat = false
   end
 
+  # @return [Boolean]
   def enabled?
     @enable_heartbeat
   end
 
+  # @param message [String]
+  # @return [void]
   def self.notify(message)
     return unless @enable_heartbeat
+
     begin
       @socket.send(message, 0)
-      MethodExecutor.record("debug", "heartbeat", "Heartbeat sent: #{message}")
+      MethodExecutor.record('debug', 'heartbeat', "Heartbeat sent: #{message}")
-    rescue => e
+    rescue StandardError => e
-      MethodExecutor.error("heartbeat", "Failed to send heartbeat: #{e}")
+      MethodExecutor.record('error', 'heartbeat', "Failed to send heartbeat: #{e}")
       @enable_heartbeat = false
     end
   end
-
 end

updates.rb

@@ -0,0 +1,72 @@
+# <<*>> -^v- SNOWARE APPLICATION
+# usage: Check for updates from remote.
+# author: S.A.
+# time: 2026-06-08
+# Copyright (c) [2026] [S.A. SNOWARE-SCU]
+# [MineSentinel] is licensed under Mulan PubL v2.
+# You can use this software according to the terms and conditions of the Mulan PubL v2.
+# You may obtain a copy of Mulan PubL v2 at:
+#          http://license.coscl.org.cn/MulanPubL-2.0
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+# EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+# MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PubL v2 for more details.
+
+# frozen_string_literal: true
+
+require 'net/http'
+require 'uri'
+
+# @type const RELEASE_SERIAL_CODE: String
+RELEASE_SERIAL_CODE = '60176fa'
+# @type const CHANNEL: String
+CHANNEL = 'master'
+# @type const VERSION_LIST_URL: String
+VERSION_LIST_URL = "https://raw.giteeusercontent.com/scu_team/minesentinel/#{CHANNEL}/APP_VERSIONS_LIST"
+# @type const RECURSIVE_RETRY_DEPTH: Integer
+RECURSIVE_RETRY_DEPTH = 3
+
+class UpdateManager
+  # rubocop:disable Metrics/MethodLength
+  # @return [String]
+  def self.fetch
+    MethodExecutor.record('debug', 'updates', "Fetching version list from #{VERSION_LIST_URL}")
+    uri = URI(VERSION_LIST_URL)
+    response = Net::HTTP.get_response(uri)
+    case response.code.to_i
+    when 200
+      MethodExecutor.record('debug', 'updates', 'Version list fetched successfully.')
+      response.body
+    else
+      raise "Unexpected HTTP response code: #{response.code}"
+    end
+  rescue StandardError => e
+    MethodExecutor.record('error', 'updates', "Failed to fetch version list: #{e}")
+    nil
+  end
+  # rubocop:enable Metrics/MethodLength
+
+  # rubocop:disable Metrics/MethodLength
+  # @return [Hash{Symbol=>Symbol, Symbol=>String}]
+  def self.check
+    raw = fetch
+    if raw.nil?
+      MethodExecutor.record('error', 'updates', 'Version list is empty, cannot check updates.')
+      raise 'Unknown Error'
+    end
+
+    lines = raw.lines(chomp: true)
+    lines.each_with_index do |line, index|
+      line_num = index + 1
+      if line == RELEASE_SERIAL_CODE && line_num == lines.size
+        MethodExecutor.record('info', 'updates', "Current version #{RELEASE_SERIAL_CODE} is up to date.")
+        return { type: :Newest, version: RELEASE_SERIAL_CODE }
+      end
+    end
+
+    latest = lines.last
+    MethodExecutor.record('info', 'updates', "Newer version #{latest} available (current: #{RELEASE_SERIAL_CODE}).")
+    { type: :NewerAvailable, version: latest }
+  end
+  # rubocop:enable Metrics/MethodLength
+end