优化: ssh-proxy russh 迁移后代码整理

- 移除未使用的 async-trait 依赖
- 添加断线重连逻辑，会话失效时自动重连
- 修复 get_or_create_session TOCTOU 竞态条件
- 日志智能分级: 慢请求告警、退出码识别
- 用 time crate 替换手写日期计算 (删除40行)
- UTF-8 安全截断修复
- 同步优化 mysql-proxy 日志模块

mysql-proxy/Cargo.toml

@@ -14,6 +14,7 @@ toml = "0.8"
 anyhow = "1"
 clap = { version = "4", features = ["derive"] }
 ureq = "2"  # CLI HTTP client (2.x has simpler API)
+time = { version = "0.3", features = ["formatting", "macros"] }
 
 [profile.release]
 opt-level = "z"

mysql-proxy/src/logger.rs

@@ -3,7 +3,6 @@ use std::fs::{File, OpenOptions};
 use std::io::Write;
 use std::path::PathBuf;
 use std::sync::Mutex;
-use std::time::{SystemTime, UNIX_EPOCH};
 
 /// 日志记录器
 pub struct RequestLogger {
@@ -136,6 +135,12 @@ impl LogEntry {
 
     pub fn with_duration(mut self, ms: u64) -> Self {
         self.duration_ms = ms;
+        // 慢请求告警: >2s 为 WARN, >5s 为 ERROR
+        if ms > 5000 && self.level == "INFO" {
+            self.level = "ERROR".to_string();
+        } else if ms > 2000 && self.level == "INFO" {
+            self.level = "WARN".to_string();
+        }
         self
     }
 
@@ -157,62 +162,16 @@ impl LogEntry {
 }
 
 fn current_timestamp() -> String {
-    let now = SystemTime::now()
-        .duration_since(UNIX_EPOCH)
-        .unwrap_or_default();
-    let secs = now.as_secs();
-    let datetime = chrono_timestamp(secs);
-    format!("{}Z", datetime)
-}
-
-fn chrono_timestamp(secs: u64) -> String {
-    let days = secs / 86400;
-    let remaining = secs % 86400;
-    let hours = remaining / 3600;
-    let minutes = (remaining % 3600) / 60;
-    let seconds = remaining % 60;
-
-    // 从 1970-01-01 开始计算日期
-    let mut year = 1970;
-    let mut days_left = days;
-
-    loop {
-        let days_in_year = if is_leap_year(year) { 366 } else { 365 };
-        if days_left < days_in_year {
-            break;
-        }
-        days_left -= days_in_year;
-        year += 1;
-    }
-
-    let month_days = if is_leap_year(year) {
-        [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
-    } else {
-        [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
-    };
-
-    let mut month = 1;
-    for &days_in_month in &month_days {
-        if days_left < days_in_month {
-            break;
-        }
-        days_left -= days_in_month;
-        month += 1;
-    }
-    let day = days_left + 1;
-
-    format!("{:04}-{:02}-{:02}T{:02}:{:02}:{:02}", year, month, day, hours, minutes, seconds)
-}
-
-fn is_leap_year(year: u64) -> bool {
-    (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)
+    time::OffsetDateTime::now_utc()
+        .format(&time::macros::format_description!("[year]-[month]-[day]T[hour]:[minute]:[second]"))
+        .unwrap_or_default()
 }
 
 fn truncate_string(s: &str, max_len: usize) -> String {
-    if s.len() <= max_len {
+    if s.chars().count() <= max_len {
         s.to_string()
     } else {
-        format!("{}... (truncated)", &s[..max_len])
+        format!("{}... (truncated)", s.chars().take(max_len).collect::<String>())
     }
 }