postfix-log-parser 0.2.0

//! # Proxymap 映射代理组件解析器
//!
//! Proxymap 是 Postfix 的映射代理服务组件，负责：
//! - 为其他组件提供映射表查询服务
//! - 缓存频繁访问的映射数据
//! - 处理映射表的并发访问
//! - 监控配置文件变更和警告
//!
//! ## 核心功能
//!
//! - **映射代理**: 为其他组件提供统一的映射查询接口
//! - **缓存管理**: 缓存热点映射数据，提高查询性能
//! - **并发控制**: 处理多个组件的并发映射查询
//! - **配置监控**: 检测配置文件参数覆盖和冲突
//!
//! ## 支持的事件类型
//!
//! - **配置覆盖警告**: 配置文件中重复参数定义的警告
//!
//! ## 示例日志格式
//!
//! ```text
//! # 配置覆盖警告
//! warning: /etc/postfix/main.cf, line 820: overriding earlier entry: smtpd_recipient_restrictions=...
//! warning: /etc/postfix/main.cf, line 806: overriding earlier entry: smtpd_client_message_rate_limit=0
//! ```

use regex::Regex;

use crate::events::proxymap::{ProxymapEvent, ProxymapEventType};

/// PROXYMAP parser for Postfix proxy mapping service
#[derive(Debug)]
pub struct ProxymapParser {
    config_override_regex: Regex,
}

impl ProxymapParser {
    /// Creates a new ProxymapParser
    pub fn new() -> Self {
        Self {
            config_override_regex: Regex::new(
                r"^(.+?), line (\d+): overriding earlier entry: (.+?)=(.+)$",
            )
            .expect("Failed to compile config override regex"),
        }
    }

    /// Parse a complete log line into a ProxymapEvent
    pub fn parse_log_line(&self, line: &str) -> Result<ProxymapEvent, String> {
        // Basic line format: Month Day Time Host postfix/proxymap[PID]: warning: message
        let basic_regex = Regex::new(
            r"^((?:\d{4}\s+)?\w{3}\s+\d{1,2}\s+\d{2}:\d{2}:\d{2}(?:\.\d+)?)\s+\S+\s+postfix/proxymap\[(\d+)\]:\s+warning:\s+(.+)$"
        ).map_err(|e| format!("Regex compilation error: {}", e))?;

        let captures = basic_regex
            .captures(line)
            .ok_or_else(|| "Line does not match proxymap log format".to_string())?;

        let timestamp = captures.get(1).unwrap().as_str();
        let process_id = captures.get(2).unwrap().as_str();
        let message = captures.get(3).unwrap().as_str();

        // Try to parse as config override warning
        if let Some(event) = self.parse_config_override_warning(timestamp, process_id, message) {
            return Ok(event);
        }

        Err(format!("Unknown proxymap message type: {}", message))
    }

    /// Get the number of supported event types
    pub fn supported_event_types(&self) -> usize {
        1
    }

    /// Check if this parser can handle the given line
    pub fn matches_component(&self, line: &str) -> bool {
        line.contains("postfix/proxymap[")
    }

    /// Parse config override warning
    fn parse_config_override_warning(
        &self,
        timestamp: &str,
        process_id: &str,
        message: &str,
    ) -> Option<ProxymapEvent> {
        if let Some(captures) = self.config_override_regex.captures(message) {
            let file_path = captures.get(1).unwrap().as_str();
            let line_number: u32 = captures.get(2).unwrap().as_str().parse().ok()?;
            let parameter = captures.get(3).unwrap().as_str();
            let value = captures.get(4).unwrap().as_str();

            Some(ProxymapEvent {
                timestamp: timestamp.to_string(),
                process_id: process_id.to_string(),
                event_type: ProxymapEventType::ConfigOverrideWarning {
                    file_path: file_path.to_string(),
                    line_number,
                    parameter: parameter.to_string(),
                    value: value.to_string(),
                },
            })
        } else {
            None
        }
    }
}

impl Default for ProxymapParser {
    fn default() -> Self {
        Self::new()
    }
}

impl crate::components::ComponentParser for ProxymapParser {
    fn parse(
        &self,
        message: &str,
    ) -> Result<crate::events::base::ComponentEvent, crate::error::ParseError> {
        // Try to parse as config override warning
        if let Some(captures) = self.config_override_regex.captures(message) {
            let file_path = captures.get(1).unwrap().as_str();
            let line_number: u32 = captures.get(2).unwrap().as_str().parse().map_err(|_| {
                crate::error::ParseError::ComponentParseError {
                    component: self.component_name().to_string(),
                    reason: "Invalid line number format".to_string(),
                }
            })?;
            let parameter = captures.get(3).unwrap().as_str();
            let value = captures.get(4).unwrap().as_str();

            let event = ProxymapEvent {
                timestamp: "0".to_string(),  // Temporary timestamp
                process_id: "0".to_string(), // Temporary process ID
                event_type: ProxymapEventType::ConfigOverrideWarning {
                    file_path: file_path.to_string(),
                    line_number,
                    parameter: parameter.to_string(),
                    value: value.to_string(),
                },
            };

            return Ok(crate::events::base::ComponentEvent::Proxymap(event));
        }

        Err(crate::error::ParseError::ComponentParseError {
            component: self.component_name().to_string(),
            reason: format!("Unable to parse proxymap message: {}", message),
        })
    }

    fn component_name(&self) -> &'static str {
        "proxymap"
    }

    fn can_parse(&self, message: &str) -> bool {
        self.config_override_regex.is_match(message)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::components::ComponentParser;

    fn create_parser() -> ProxymapParser {
        ProxymapParser::new()
    }

    #[test]
    fn test_config_override_warning_parsing() {
        let parser = create_parser();
        let log_line = "Apr 08 17:54:42 m01 postfix/proxymap[80]: warning: /etc/postfix/main.cf, line 820: overriding earlier entry: smtpd_recipient_restrictions=check_client_access pcre:/etc/postfix/filter_trusted,                                                                permit_sasl_authenticated,                                                                permit_mynetworks,                                                                reject_unauth_destination,                                                                pcre:/etc/postfix/filter_default";

        let result = parser.parse_log_line(log_line);
        assert!(result.is_ok());

        let event = result.unwrap();
        assert_eq!(event.timestamp, "Apr 08 17:54:42");
        assert_eq!(event.process_id, "80");

        let ProxymapEventType::ConfigOverrideWarning {
            file_path,
            line_number,
            parameter,
            value,
        } = event.event_type;

        assert_eq!(file_path, "/etc/postfix/main.cf");
        assert_eq!(line_number, 820);
        assert_eq!(parameter, "smtpd_recipient_restrictions");
        assert!(value.contains("check_client_access"));
        assert!(value.contains("permit_sasl_authenticated"));
    }

    #[test]
    fn test_client_message_rate_limit_parsing() {
        let parser = create_parser();
        let log_line = "Apr 10 11:17:43 m01 postfix/proxymap[80]: warning: /etc/postfix/main.cf, line 806: overriding earlier entry: smtpd_client_message_rate_limit=0";

        let result = parser.parse_log_line(log_line);
        assert!(result.is_ok());

        let event = result.unwrap();
        assert_eq!(event.timestamp, "Apr 10 11:17:43");
        assert_eq!(event.process_id, "80");

        let ProxymapEventType::ConfigOverrideWarning {
            file_path,
            line_number,
            parameter,
            value,
        } = event.event_type;

        assert_eq!(file_path, "/etc/postfix/main.cf");
        assert_eq!(line_number, 806);
        assert_eq!(parameter, "smtpd_client_message_rate_limit");
        assert_eq!(value, "0");
    }

    #[test]
    fn test_discard_ehlo_keywords_parsing() {
        let parser = create_parser();
        let log_line = "Apr 10 11:17:43 m01 postfix/proxymap[80]: warning: /etc/postfix/main.cf, line 826: overriding earlier entry: smtpd_discard_ehlo_keywords=silent-discard,dsn,etrn";

        let result = parser.parse_log_line(log_line);
        assert!(result.is_ok());

        let event = result.unwrap();
        let ProxymapEventType::ConfigOverrideWarning {
            parameter, value, ..
        } = event.event_type;

        assert_eq!(parameter, "smtpd_discard_ehlo_keywords");
        assert_eq!(value, "silent-discard,dsn,etrn");
    }

    #[test]
    fn test_different_line_numbers() {
        let parser = create_parser();
        let test_cases = vec![
            ("line 806", 806),
            ("line 819", 819),
            ("line 820", 820),
            ("line 826", 826),
        ];

        for (line_text, expected_line) in test_cases {
            let log_line = format!("Apr 10 11:17:43 m01 postfix/proxymap[80]: warning: /etc/postfix/main.cf, {}: overriding earlier entry: test_param=test_value", line_text);

            let result = parser.parse_log_line(&log_line);
            assert!(result.is_ok());

            let event = result.unwrap();
            let ProxymapEventType::ConfigOverrideWarning { line_number, .. } = event.event_type;
            assert_eq!(line_number, expected_line);
        }
    }

    #[test]
    fn test_different_process_ids() {
        let parser = create_parser();
        let test_cases = vec!["80", "84"];

        for pid in test_cases {
            let log_line = format!("Apr 08 17:54:42 m01 postfix/proxymap[{}]: warning: /etc/postfix/main.cf, line 820: overriding earlier entry: test_param=test_value", pid);

            let result = parser.parse_log_line(&log_line);
            assert!(result.is_ok());

            let event = result.unwrap();
            assert_eq!(event.process_id, pid);
        }
    }

    #[test]
    fn test_component_matching() {
        let parser = create_parser();

        // 应该匹配的行
        let matching_lines = vec![
            "Apr 08 17:54:42 m01 postfix/proxymap[80]: warning: /etc/postfix/main.cf, line 820: overriding earlier entry: test=value",
            "Apr 10 11:17:43 m01 postfix/proxymap[84]: warning: /etc/postfix/main.cf, line 806: overriding earlier entry: another=param",
        ];

        for line in matching_lines {
            assert!(parser.matches_component(line), "Should match: {}", line);
        }

        // 不应该匹配的行
        let non_matching_lines = vec![
            "Apr 08 17:54:42 m01 postfix/qmgr[78]: info: statistics",
            "Apr 08 17:54:42 m01 postfix/smtpd[78]: connect from localhost",
            "Apr 08 17:54:42 m01 postfix/cleanup[78]: message-id=<test@example.com>",
        ];

        for line in non_matching_lines {
            assert!(
                !parser.matches_component(line),
                "Should not match: {}",
                line
            );
        }
    }

    #[test]
    fn test_invalid_log_lines() {
        let parser = create_parser();

        let invalid_lines = vec![
            "Invalid log line",
            "Apr 08 17:54:42 m01 postfix/qmgr[78]: info: statistics",
            "Apr 08 17:54:42 m01 postfix/proxymap[80]: info: some other message",
            "incomplete line",
        ];

        for line in invalid_lines {
            let result = parser.parse_log_line(line);
            assert!(result.is_err(), "Should fail to parse: {}", line);
        }
    }

    #[test]
    fn test_supported_event_types() {
        let parser = create_parser();
        assert_eq!(parser.supported_event_types(), 1);
    }

    #[test]
    fn test_parser_default() {
        let parser = ProxymapParser::default();
        assert_eq!(parser.supported_event_types(), 1);
    }

    #[test]
    fn test_component_parser_parse() {
        let parser = ProxymapParser::new();

        // 测试配置覆盖警告
        let message = "/etc/postfix/main.cf, line 820: overriding earlier entry: smtpd_recipient_restrictions=check_client_access pcre:/etc/postfix/filter_trusted";
        let result = parser.parse(message);

        assert!(result.is_ok());
        match result.unwrap() {
            crate::events::base::ComponentEvent::Proxymap(event) => {
                assert_eq!(event.process_id, "0"); // 临时进程ID
                let ProxymapEventType::ConfigOverrideWarning {
                    file_path,
                    line_number,
                    parameter,
                    ..
                } = event.event_type;

                assert_eq!(file_path, "/etc/postfix/main.cf");
                assert_eq!(line_number, 820);
                assert_eq!(parameter, "smtpd_recipient_restrictions");
            }
            _ => panic!("Expected Proxymap ComponentEvent"),
        }
    }

    #[test]
    fn test_component_parser_invalid() {
        let parser = ProxymapParser::new();

        let message = "some invalid message";
        let result = parser.parse(message);

        assert!(result.is_err());
        match result.unwrap_err() {
            crate::error::ParseError::ComponentParseError { component, .. } => {
                assert_eq!(component, "proxymap");
            }
            _ => panic!("Expected ComponentParseError"),
        }
    }

    #[test]
    fn test_component_name() {
        let parser = ProxymapParser::new();
        assert_eq!(parser.component_name(), "proxymap");
    }

    #[test]
    fn test_can_parse() {
        let parser = ProxymapParser::new();

        // 应该能解析的消息
        assert!(parser
            .can_parse("/etc/postfix/main.cf, line 820: overriding earlier entry: test=value"));

        // 不应该解析的消息
        assert!(!parser.can_parse("some random message"));
        assert!(!parser.can_parse("overriding earlier entry: test=value")); // 缺少main.cf
        assert!(!parser.can_parse("/etc/postfix/main.cf, line 820: some other message"));
        // 缺少overriding
    }

    #[test]
    fn test_parse_real_log_samples() {
        let parser = create_parser();

        // 真实日志样本
        let real_logs = vec![
            "Apr 08 17:54:42 m01 postfix/proxymap[80]: warning: /etc/postfix/main.cf, line 820: overriding earlier entry: smtpd_recipient_restrictions=check_client_access pcre:/etc/postfix/filter_trusted,                                                                permit_sasl_authenticated,                                                                permit_mynetworks,                                                                reject_unauth_destination,                                                                pcre:/etc/postfix/filter_default",
            "Apr 08 17:58:29 m01 postfix/proxymap[84]: warning: /etc/postfix/main.cf, line 820: overriding earlier entry: smtpd_recipient_restrictions=check_client_access pcre:/etc/postfix/filter_trusted,                                                                permit_sasl_authenticated,                                                                permit_mynetworks,                                                                reject_unauth_destination,                                                                pcre:/etc/postfix/filter_default",
            "Apr 10 11:17:43 m01 postfix/proxymap[80]: warning: /etc/postfix/main.cf, line 806: overriding earlier entry: smtpd_client_message_rate_limit=0",
            "Apr 10 11:17:43 m01 postfix/proxymap[80]: warning: /etc/postfix/main.cf, line 819: overriding earlier entry: smtpd_recipient_restrictions=check_client_access pcre:/etc/postfix/filter_trusted,                                                                permit_sasl_authenticated,                                                                permit_mynetworks,                                                                reject_unauth_destination,                                                                pcre:/etc/postfix/filter_default",
            "Apr 10 11:17:43 m01 postfix/proxymap[80]: warning: /etc/postfix/main.cf, line 826: overriding earlier entry: smtpd_discard_ehlo_keywords=silent-discard,dsn,etrn",
        ];

        for (i, log_line) in real_logs.iter().enumerate() {
            let result = parser.parse_log_line(log_line);
            assert!(
                result.is_ok(),
                "Failed to parse real log sample {}: {}",
                i,
                log_line
            );

            let event = result.unwrap();
            let ProxymapEventType::ConfigOverrideWarning { file_path, .. } = event.event_type;
            assert_eq!(file_path, "/etc/postfix/main.cf");
        }
    }
}