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evorule_cli/
error.rs

1// SPDX-License-Identifier: AGPL-3.0-or-later
2// Copyright (C) 2026 EvoRule Project
3// This file is part of EvoRule, licensed under GNU Affero General Public License v3 or later.
4//! CLI 错误类型
5//!
6//! 统一的错误枚举,覆盖 I/O、JSON、规则加载、payload 解析、fact log 解析、
7//! TCB 执行、WAL 序列化等场景。所有子命令返回 `Result<(), CliError>`,
8//! main.rs 根据错误类型决定退出码。
9
10use thiserror::Error;
11
12/// CLI 错误
13///
14/// 设计原则:
15/// - 每个变体携带足够上下文(路径、行号、原因),便于用户定位问题
16/// - `#[from]` 自动转换 std::io::Error / serde_json::Error / WalError
17/// - Display 输出人类可读的中文/英文混合消息(与现有 CLI 风格一致)
18#[derive(Debug, Error)]
19pub enum CliError {
20    /// 文件系统 I/O 错误
21    #[error("I/O error: {0}")]
22    Io(#[from] std::io::Error),
23
24    /// JSON 序列化/反序列化错误
25    #[error("JSON error: {0}")]
26    Json(#[from] serde_json::Error),
27
28    /// tier1 WAL 序列化错误(fact_from_json 失败等)
29    #[error("WAL error: {0}")]
30    Wal(#[from] evorule_reactor::WalError),
31
32    /// 规则目录不存在
33    #[error("Rules directory does not exist: {0}")]
34    RulesDirNotFound(String),
35
36    /// 规则目录中无 .json 文件
37    #[error("No .json files found in {0}")]
38    NoRulesFound(String),
39
40    /// 初始 payload JSON 解析失败
41    #[error("Invalid payload JSON: {0}")]
42    InvalidPayload(String),
43
44    /// fact log 解析错误(指定行号和原因)
45    #[error("Fact log parse error at line {line}: {reason}")]
46    FactLogParse {
47        /// 出错的行号(1-based)
48        line: usize,
49        /// 错误原因
50        reason: String,
51    },
52
53    /// 哈希链验证失败
54    #[error("Hash chain verification failed: {0}")]
55    HashChain(String),
56
57    /// 执行完成但产生 Error 事实(规则执行失败)
58    ///
59    ///(C1/C3):执行含 Error fact 时不再返回退出码 0。
60    /// CI/自动化管道以退出码判定成败,Error fact 静默成功会让"确定性执行"
61    /// 的核心承诺在自动化场景下失效。fact log 仍正常写出供审计。
62    #[error(
63        "Execution completed with {count} Error fact(s); fact log written for audit (exit code 3)"
64    )]
65    ExecutionHadErrors {
66        /// Error 事实数量
67        count: usize,
68    },
69
70    /// 通用错误(兜底)
71    #[error("{0}")]
72    Other(String),
73}
74
75impl CliError {
76    /// 从任意字符串创建通用错误
77    ///
78    /// # 示例
79    /// ```
80    /// use evorule_cli::CliError;
81    ///
82    /// let err = CliError::other("something went wrong");
83    /// assert_eq!(err.to_string(), "something went wrong");
84    /// ```
85    pub fn other(msg: impl Into<String>) -> Self {
86        Self::Other(msg.into())
87    }
88}
89
90/// 退出码映射
91///
92/// 约定:
93/// - 0:成功
94/// - 1:通用错误(默认)
95/// - 2:规则加载错误(目录不存在、无 .json)
96/// - 3:执行完成但产生 Error 事实(:不再静默成功)
97impl CliError {
98    /// 返回该错误对应的退出码
99    ///
100    /// # 约定
101    /// - 0:成功
102    /// - 1:通用错误(默认)
103    /// - 2:规则加载错误(目录不存在、无 .json)
104    /// - 3:执行完成但产生 Error 事实()
105    ///
106    /// # 示例
107    /// ```
108    /// use evorule_cli::CliError;
109    ///
110    /// // 规则目录缺失 → 退出码 2
111    /// let dir_err = CliError::RulesDirNotFound("/nonexistent".into());
112    /// assert_eq!(dir_err.exit_code(), 2);
113    ///
114    /// // 执行含 Error fact → 退出码 3
115    /// let exec_err = CliError::ExecutionHadErrors { count: 1 };
116    /// assert_eq!(exec_err.exit_code(), 3);
117    ///
118    /// // 通用错误 → 退出码 1
119    /// assert_eq!(CliError::other("boom").exit_code(), 1);
120    /// ```
121    pub fn exit_code(&self) -> i32 {
122        match self {
123            CliError::RulesDirNotFound(_) | CliError::NoRulesFound(_) => 2,
124            CliError::ExecutionHadErrors { .. } => 3,
125            _ => 1,
126        }
127    }
128}
129
130#[cfg(test)]
131mod tests {
132    #![allow(clippy::unwrap_used)]
133    use super::*;
134
135    #[test]
136    fn test_exit_code_mapping() {
137        assert_eq!(CliError::RulesDirNotFound("x".into()).exit_code(), 2);
138        assert_eq!(CliError::NoRulesFound("x".into()).exit_code(), 2);
139        assert_eq!(CliError::ExecutionHadErrors { count: 1 }.exit_code(), 3);
140        assert_eq!(CliError::Other("x".into()).exit_code(), 1);
141        assert_eq!(
142            CliError::Io(std::io::Error::new(std::io::ErrorKind::NotFound, "x")).exit_code(),
143            1
144        );
145    }
146
147    #[test]
148    fn test_from_io_error() {
149        let io_err = std::io::Error::new(std::io::ErrorKind::NotFound, "file missing");
150        let cli_err: CliError = io_err.into();
151        assert!(matches!(cli_err, CliError::Io(_)));
152    }
153
154    #[test]
155    fn test_display_includes_context() {
156        let err = CliError::FactLogParse {
157            line: 42,
158            reason: "missing type field".into(),
159        };
160        let msg = format!("{}", err);
161        assert!(msg.contains("42"));
162        assert!(msg.contains("missing type field"));
163    }
164}