From a50fd786520f04e1e4df1db3c8cdaf586f2ca094 Mon Sep 17 00:00:00 2001
From: chuan <pchuan98@qq.com>
Date: Fri, 27 Mar 2026 17:08:58 +0800
Subject: [PATCH] feat: add simple files

---
 Cargo.lock      | 287 ++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml      |   3 +
 README.md       |   3 +-
 docs/prd.md     | 190 ++++++++++++++++++++++++++++++++
 src/commands.rs |  54 +++++++++
 src/config.rs   |  26 +++++
 src/main.rs     |  37 +++++--
 watchdog.toml   |   3 +
 8 files changed, 594 insertions(+), 9 deletions(-)
 create mode 100644 docs/prd.md
 create mode 100644 src/commands.rs
 create mode 100644 src/config.rs
 create mode 100644 watchdog.toml

diff --git a/Cargo.lock b/Cargo.lock
index a1c0c66..39a5473 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,293 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "anstream"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "824a212faf96e9acacdbd09febd34438f8f711fb84e09a8916013cd7815ca28d"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is_terminal_polyfill",
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "940b3a0ca603d1eade50a4846a2afffd5ef57a9feac2c0e2ec2e14f9ead76000"
+
+[[package]]
+name = "anstyle-parse"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "52ce7f38b242319f7cabaa6813055467063ecdc9d355bbb4ce0c68908cd8130e"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle-query"
+version = "1.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "40c48f72fd53cd289104fc64099abca73db4166ad86ea0b4341abe65af83dadc"
+dependencies = [
+ "windows-sys",
+]
+
+[[package]]
+name = "anstyle-wincon"
+version = "3.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "291e6a250ff86cd4a820112fb8898808a366d8f9f58ce16d1f538353ad55747d"
+dependencies = [
+ "anstyle",
+ "once_cell_polyfill",
+ "windows-sys",
+]
+
+[[package]]
+name = "clap"
+version = "4.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b193af5b67834b676abd72466a96c1024e6a6ad978a1f484bd90b85c94041351"
+dependencies = [
+ "clap_builder",
+ "clap_derive",
+]
+
+[[package]]
+name = "clap_builder"
+version = "4.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "714a53001bf66416adb0e2ef5ac857140e7dc3a0c48fb28b2f10762fc4b5069f"
+dependencies = [
+ "anstream",
+ "anstyle",
+ "clap_lex",
+ "strsim",
+]
+
+[[package]]
+name = "clap_derive"
+version = "4.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1110bd8a634a1ab8cb04345d8d878267d57c3cf1b38d91b71af6686408bbca6a"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "clap_lex"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8d4a3bb8b1e0c1050499d1815f5ab16d04f0959b233085fb31653fbfc9d98f9"
+
+[[package]]
+name = "colorchoice"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570"
+
+[[package]]
+name = "equivalent"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
+
+[[package]]
+name = "hashbrown"
+version = "0.16.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "841d1cc9bed7f9236f321df977030373f4a4163ae1a7dbfe1a51a2c1a51d9100"
+
+[[package]]
+name = "heck"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
+
+[[package]]
+name = "indexmap"
+version = "2.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7714e70437a7dc3ac8eb7e6f8df75fd8eb422675fc7678aff7364301092b1017"
+dependencies = [
+ "equivalent",
+ "hashbrown",
+]
+
+[[package]]
+name = "is_terminal_polyfill"
+version = "1.70.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6cb138bb79a146c1bd460005623e142ef0181e3d0219cb493e02f7d08a35695"
+
+[[package]]
+name = "once_cell_polyfill"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "384b8ab6d37215f3c5301a95a4accb5d64aa607f1fcb26a11b5303878451b4fe"
+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8fd00f0bb2e90d81d1044c2b32617f68fcb9fa3bb7640c23e9c748e53fb30934"
+dependencies = [
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+]
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+dependencies = [
+ "proc-macro2",
+]
+
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+dependencies = [
+ "serde_core",
+ "serde_derive",
+]
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+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
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+checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
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+checksum = "876ac351060d4f882bb1032b6369eb0aef79ad9df1ea8bc404874d8cc3d0cd98"
+dependencies = [
+ "serde_core",
+]
+
+[[package]]
+name = "strsim"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e665b8803e7b1d2a727f4023456bbbbe74da67099c585258af0ad9c5013b9b99"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "toml"
+version = "1.1.0+spec-1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8195ca05e4eb728f4ba94f3e3291661320af739c4e43779cbdfae82ab239fcc"
+dependencies = [
+ "indexmap",
+ "serde_core",
+ "serde_spanned",
+ "toml_datetime",
+ "toml_parser",
+ "toml_writer",
+ "winnow",
+]
+
+[[package]]
+name = "toml_datetime"
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+dependencies = [
+ "serde_core",
+]
+
+[[package]]
+name = "toml_parser"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "winnow",
+]
+
+[[package]]
+name = "toml_writer"
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+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
+
+[[package]]
+name = "utf8parse"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
+
 [[package]]
 name = "watchdog"
 version = "0.1.0"
+dependencies = [
+ "clap",
+ "serde",
+ "toml",
+]
+
+[[package]]
+name = "windows-link"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
+
+[[package]]
+name = "windows-sys"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "winnow"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a90e88e4667264a994d34e6d1ab2d26d398dcdca8b7f52bec8668957517fc7d8"
diff --git a/Cargo.toml b/Cargo.toml
index 8578fc2..0057900 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,3 +4,6 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+toml = "*"
+clap = { version = "4", features = ["derive"] }
+serde = { version = "1", features = ["derive"] }
diff --git a/README.md b/README.md
index 4ffcea7..648fd12 100644
--- a/README.md
+++ b/README.md
@@ -17,5 +17,4 @@ sudo apt install -y gcc-aarch64-linux-gnu
 
 rustup target add aarch64-unknown-linux-musl
 sudo apt install -y musl-tools gcc-aarch64-linux-gnu
-```
-
+```
\ No newline at end of file
diff --git a/docs/prd.md b/docs/prd.md
new file mode 100644
index 0000000..2078c28
--- /dev/null
+++ b/docs/prd.md
@@ -0,0 +1,190 @@
+# Watchdog 项目 PRD
+
+## 1. 项目概述
+
+本项目目标是实现一个运行于 Linux 平台的守护型看门狗程序，用于监控一个或多个目标程序的运行状态，并在目标程序异常退出、未启动或持续不稳定时，按照预定义策略执行重启与回退。该程序首先服务于 Linux arm64 部署场景，要求支持在 x64 开发环境中交叉编译到 arm64 设备运行。系统设计时需保留未来扩展到 Windows 的可能，但第一版本不承担 Windows 兼容实现。
+
+该项目不负责业务程序本身的逻辑，不承担升级平台、远程编排、图形界面或复杂运维平台职责。其定位是一个本地进程守护与回退执行器，提供稳定、可预测、可测试的最小核心能力。
+
+## 2. 项目目标
+
+第一版本的核心目标如下：
+
+1. 支持监控多个目标程序。
+2. 支持通过轮询方式检测程序是否处于有效运行状态。
+3. 支持在目标程序未运行时自动拉起。
+4. 支持对频繁崩溃或持续启动失败的程序执行 fallback。
+5. fallback 顺序固定，但每一级 fallback 的目标内容由配置指定。
+6. fallback 为临时运行时切换，不持久化到磁盘。
+7. 支持固定 CLI 子命令执行。
+8. 支持 stdout/stderr 日志输出。
+9. 支持单元测试，保证核心状态机与策略逻辑可验证。
+
+## 3. 非目标
+
+第一版本明确不做以下内容：
+
+- 不支持任意 shell 指令编排。
+- 不支持动态插件系统。
+- 不支持配置热更新。
+- 不支持远程管理与网络 API。
+- 不支持安装包管理、升级平台和复杂版本治理。
+- 不支持集成测试框架自动化，仅要求单元测试。
+- 不支持所有极端失败场景的复杂恢复决策；若最终 fallback 目标仍无法启动，则系统持续尝试最后一级 fallback 即可。
+
+## 4. 核心业务场景
+
+### 4.1 目标程序未启动
+看门狗轮询检测目标程序状态；若检测失败，系统尝试执行该目标当前激活版本的启动命令。
+
+### 4.2 目标程序启动后短时间退出
+若程序启动后未达到“稳定运行判定窗口”，则该次行为视为启动失败，不计入 crash。
+
+### 4.3 目标程序稳定运行后退出
+若程序已连续存活至少 5 秒，再发生退出，则视为一次 crash 事件。看门狗根据配置统计检测窗口内 crash 次数，达到阈值后触发 fallback。
+
+### 4.4 目标程序持续不稳定
+当一个目标在给定检测窗口内达到阈值，例如默认 1 分钟内 3 次 crash，则切换到固定顺序中的下一级 fallback 目标。
+
+### 4.5 fallback 已触发
+一旦某目标切换到 fallback，除非整个 watchdog 进程重启，否则不主动恢复到主目标。系统继续守护当前 fallback 目标；若仍失败，则继续向后切换，直到最终 fallback 目标。最终 fallback 目标若仍无法启动，则持续尝试该最终目标。
+
+## 5. 功能需求
+
+## 5.1 多目标监控
+系统需支持多个目标程序并发受管。第一版本允许采用单线程轮询模型，即每一轮按顺序遍历所有目标，分别执行检测、重启和 fallback 决策。每个目标需维护独立运行状态，互不影响。
+
+## 5.2 启动方式
+所有目标及 fallback 均采用 `exec` 方式启动。即配置明确给出：
+
+- 可执行文件路径
+- 参数列表
+- 可选工作目录
+
+第一版本不通过 shell 解释器启动，不依赖 `sh -c` 或类似方式，以降低转义复杂度、不确定性和命令注入风险。
+
+## 5.3 检测机制
+检测机制采用“provider + 配置项”的方式实现。第一版本不构建高度抽象的通用组合 DSL，而是定义若干固定检测方法，每个方法对应明确配置字段。一个目标可配置多个检测方法；所有检测方法均通过时，视为目标当前健康。
+
+已确认需要支持或预留的检测维度包括：
+
+- 进程是否存在
+- 程序文件是否存在
+- PID 文件是否存在
+- 指定文件是否存在
+
+“检测程序是否存在”属于检测条件之一，不等同于进程是否存在。
+
+## 5.4 稳定运行与 crash 判定
+系统需定义稳定运行窗口。当前约定为 5 秒：
+
+- 启动后若存活不足 5 秒即退出，视为启动失败。
+- 启动后若连续运行至少 5 秒再退出，视为 crash。
+
+看门狗需统计检测窗口中的 crash 事件次数。默认策略为“1 分钟内 3 次 crash 触发 fallback”，该阈值与窗口长度应允许通过配置覆盖。
+
+## 5.5 fallback 机制
+fallback 顺序固定，第一版本定义为：
+
+1. 主目标
+2. 上一个版本
+3. 更新后的出厂版本
+4. 出厂版本
+
+配置文件负责指定每一级实际启动目标，不负责改写顺序。fallback 的本质是运行时切换当前激活目标，不修改持久化配置、不覆盖原始程序文件、不执行安装动作。切换后仅影响当前 watchdog 生命周期内的行为。
+
+## 5.6 CLI 子命令
+程序需支持固定 CLI 子命令。第一版本至少应考虑以下命令集合：
+
+- `run`：启动 watchdog 主循环
+- `check`：执行一次检测
+- `start`：手动启动指定目标
+- `check-env`：检测运行环境
+
+是否进一步开放 fallback 相关手工命令可在后续迭代决定，但不作为第一版本必需能力。
+
+## 5.7 日志
+第一版本日志输出目标为 stdout/stderr。日志需要覆盖以下关键信息：
+
+- watchdog 启动与退出
+- 每个目标的检测结果
+- 启动尝试
+- 启动失败
+- 稳定运行判定通过
+- crash 事件记录
+- fallback 切换
+- 最终 fallback 持续尝试
+
+后续如需写文件或接入 journald，应通过独立日志层扩展，而不影响核心状态机。
+
+## 5.8 测试
+必须提供单元测试，覆盖以下核心逻辑：
+
+- 启动成功与启动失败判定
+- 稳定运行 5 秒后的 crash 判定
+- 检测窗口内 crash 计数
+- fallback 触发阈值
+- fallback 顺序推进
+- 多目标状态相互隔离
+
+## 6. 状态机要求
+
+每个目标必须维护独立状态。最少应包含以下运行态信息：
+
+- 当前激活层级（主目标或某一级 fallback）
+- 当前进程状态
+- 最近一次启动时间
+- 是否已达到稳定运行门槛
+- 检测窗口内 crash 记录
+- 当前是否处于 fallback 模式
+
+watchdog 主循环根据检测结果和状态决定下一步动作：
+
+1. 检测通过：保持当前状态。
+2. 检测失败且当前无进程：尝试启动当前激活目标。
+3. 启动后未满 5 秒退出：记为启动失败。
+4. 启动后满 5 秒退出：记为一次 crash。
+5. crash 在窗口内达到阈值：切换到下一级 fallback。
+6. 已在最终 fallback：持续尝试最终 fallback，不再设计额外终止分支。
+
+## 7. 架构原则
+
+第一版本应坚持以下架构原则：
+
+- Linux 优先，接口设计与平台实现分离，为未来 Windows 预留空间。
+- 业务状态机与系统调用分离。
+- 检测器、启动器、fallback 决策解耦。
+- 多目标共享框架、独立状态。
+- 配置驱动目标定义，避免业务逻辑硬编码。
+- 第一版本优先简单可维护，不提前引入过度抽象。
+
+## 8. 实施计划
+
+### 阶段一：基础框架
+完成项目骨架、CLI 入口、日志初始化、配置加载与最小多目标数据模型。
+
+### 阶段二：核心运行闭环
+实现目标轮询、exec 启动、基础检测器、稳定窗口判定、crash 记录。
+
+### 阶段三：fallback 机制
+实现固定顺序 fallback、目标切换、最终 fallback 持续尝试。
+
+### 阶段四：测试与部署
+补充关键单元测试，完善 x64 到 arm64 musl 交叉编译与部署脚本。
+
+## 9. 成功标准
+
+第一版本交付时，应满足以下标准：
+
+1. 能在 Linux arm64 目标机上稳定运行。
+2. 能同时监控多个目标程序。
+3. 能对未启动程序自动拉起。
+4. 能识别“启动失败”和“稳定运行后 crash”。
+5. 能在检测窗口内依据 crash 次数触发 fallback。
+6. 能按照固定顺序切换 fallback 目标。
+7. 能输出足够定位问题的日志。
+8. 核心状态机具备单元测试覆盖。
+
+## 10. 结论
+
+该项目第一版本定位为一个本地、轻量、配置驱动的多目标 watchdog。其核心价值在于以明确、稳定、低复杂度的方式实现进程守护、稳定性判定与临时 fallback 切换。设计上应优先保证 Linux 场景落地与 arm64 部署稳定性，同时通过合理模块边界为后续平台扩展、检测器扩展与日志扩展保留空间。
\ No newline at end of file
diff --git a/src/commands.rs b/src/commands.rs
new file mode 100644
index 0000000..b80ae5c
--- /dev/null
+++ b/src/commands.rs
@@ -0,0 +1,54 @@
+use std::fs;
+use std::path::Path;
+
+use crate::config::Config;
+
+fn load_file() -> Result<Config, Box<dyn std::error::Error>> {
+    let config_path = Path::new("watchdog.toml");
+
+    if !config_path.exists() {
+        return Err(format!("missing config file: {}", config_path.display()).into());
+    }
+
+    let content = fs::read_to_string(config_path)?;
+
+    if content.trim().is_empty() {
+        return Err("watchdog.toml exists but is empty".into());
+    }
+
+    let config = toml::from_str::<Config>(&content)?;
+
+    config.validate()?;
+
+    Ok(config)
+}
+
+pub fn run() {
+    println!("run: not implemented yet");
+}
+
+pub fn check() -> Result<(), Box<dyn std::error::Error>> {
+    let config = load_file()?;
+
+    println!("checking service: {}", config.service_name);
+    println!("would run: {}", config.check_command);
+
+    Ok(())
+}
+
+pub fn start() {
+    println!("start: not implemented yet");
+}
+
+pub fn check_env() -> Result<(), Box<dyn std::error::Error>> {
+    let config = load_file()?;
+
+    println!("environment ok: config parsed successfully");
+    println!("config = {:?}", config);
+
+    println!("interval = {}", config.interval);
+    println!("service_name = {}", config.service_name);
+    println!("check_command = {}", config.check_command);
+
+    Ok(())
+}
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..fa23d99
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,26 @@
+use serde::Deserialize;
+
+#[derive(Deserialize, Debug)]
+pub struct Config {
+    pub interval: u64,
+    pub service_name: String,
+    pub check_command: String,
+}
+
+impl Config {
+    pub fn validate(&self) -> Result<(), Box<dyn std::error::Error>> {
+        if self.interval == 0 {
+            return Err("interval must be greater than 0".into());
+        }
+
+        if self.service_name.trim().is_empty() {
+            return Err("service_name must not be empty".into());
+        }
+
+        if self.check_command.trim().is_empty() {
+            return Err("check_command must not be empty".into());
+        }
+
+        Ok(())
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index a1b26ae..0303cab 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,10 +1,33 @@
-fn main() {
-    println!("Hello, world!");
+use clap::{Parser, Subcommand};
 
-    let a = 1;
-    let b = 2;
+mod commands;
+mod config;
 
-    let c = a + b;
-
-    println!("The sum of {} and {} is {}", a, b, c);
+#[derive(Parser, Debug)]
+#[command(name = "watchdog")]
+#[command(about = "A lightweight watchdog service", long_about = None)]
+struct Cli {
+    #[command(subcommand)]
+    command: Command,
+}
+
+#[derive(Subcommand, Debug)]
+enum Command {
+    Run,
+    Check,
+    Start,
+    CheckEnv,
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let cli = Cli::parse();
+
+    match cli.command {
+        Command::Run => commands::run(),
+        Command::Check => commands::check()?,
+        Command::Start => commands::start(),
+        Command::CheckEnv => commands::check_env()?,
+    }
+
+    Ok(())
 }
diff --git a/watchdog.toml b/watchdog.toml
new file mode 100644
index 0000000..0dbb3d2
--- /dev/null
+++ b/watchdog.toml
@@ -0,0 +1,3 @@
+interval = 60
+service_name = "demo"
+check_command = "echo hello"
\ No newline at end of file