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xmz7891
0ad3f648c6
上一个提交把仓库里的服务器 IP 换成了占位符，但**那些脚本本身要用这个 IP
去连服务器** —— 换掉之后它们就跑不起来了。这个提交把取值方式理清楚。
== 取值统一走 _build/lssh.py ==
YKXMZ_LS_HOST 环境变量
或 _build/.lightsail_host（一行 IP，已 gitignore）
都没有就报错，并告诉你怎么设
十个运维脚本改成 `from lssh import ... HOST as LS_HOST`，
公开仓库里一个具体地址都不留。
== 顺带修的两个自己造的 bug ==
* 用正则往 `from lssh import ...` 后面追加东西时，
追加到了行尾的 `# noqa: E402` **注释里面** ——
十处导入全是废的，脚本一跑就 NameError。
改成先剥掉注释、拼好导入、再把 noqa 加回去。
* 同一个正则还把 `from lssh import HOST as LS_HOST` 加进了
**lssh.py 自己**，造成自我导入。
教训：**正则批量改导入语句很危险**（注释、行尾、顺序都能坑到），
这种地方宁可逐个 edit。
== 为什么要重建产物 ==
docs/AFTER-INSTALL.txt 会被打进服务端 zip，而它上一轮改过
（去掉了写死的旧管理员密码）—— 不重打的话发出去的还是旧的。
重打后确认：三个产物里都没有旧密码、没有服务器 IP。
== 验证 ==
全量回归退出码 0，41 个阶段全 PASS
603 个 Python 文件语法通过
ykxmz-agent / server / watch 三个产物扫描干净
提交前泄漏闸门通过
286 lines
9.6 KiB
Python
286 lines
9.6 KiB
Python
# -*- coding: utf-8 -*-
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r'''在 Lightsail 上装好「监测单元 + 紧急预案」。
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== 部署什么 ==
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/opt/ykxmz-relay/monitor.sh 每 60 秒查一次公网
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/opt/ykxmz-relay/rescue-lightsail.sh 四级阶梯抢救
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/etc/systemd/system/ykxmz-monitor.service
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/etc/systemd/system/ykxmz-monitor.timer
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== 和随身 WiFi 那版的区别 ==
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那版围着 Cloudflare 隧道转：查隧道连接数、重启隧道、重施 MSS/MTU。
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新机器**有公网 IP、没有隧道**，所以：
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* 健康检查超时从 12 秒降到 8 秒（直连，不需要等隧道）
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* 预案第 1 级改成"重启中转服务"（不再有隧道可重启）
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* 去掉 MTU/MSS 那两级（那是 4G 线路的问题）
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== 为什么还是"每 60 秒 + 连续 3 次才动手" ==
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直连比隧道稳得多，但**公网抖动**依然存在（上游线路、Lightsail 边缘）。
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一次失败就救会天天瞎折腾，所以保留防抖。
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现在预期是**基本不会触发** —— 触发了就说明真出事了。
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'''
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from __future__ import annotations
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import sys
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import tempfile
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from pathlib import Path
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ROOT = Path(__file__).resolve().parent.parent
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sys.path.insert(0, str(ROOT / "_build"))
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from lssh import run, upload, HOST as LS_HOST # noqa: E402
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RELAY_DIR = "/opt/ykxmz-relay"
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PORT = "13245"
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PUBLIC_URL = "http://%s:%s" % (LS_HOST, PORT)
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MONITOR = r'''#!/bin/bash
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# ============================================================================
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# 网站监测单元（Lightsail 版）
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# ============================================================================
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#
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# 每 60 秒从**公网**查一次，连续 3 次不通就叫紧急预案。
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#
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# 为什么不查 127.0.0.1：
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# 本机 200 只说明进程活着。用户真正关心的是"打开
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# http://LS_HOST:13245 能不能出页面" —— 那要经过
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# Lightsail 的防火墙 / 安全组 / 上游线路。实测踩过：
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# 隧道两条实例都掉了，本机 curl 照样 200，但公网 502。
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#
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# 为什么用 timer 不用常驻进程：
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# 崩了下一分钟自己就回来，不会有"跑久了状态变脏"的问题。
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# ============================================================================
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set -u
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RELAY_DIR="${RELAY_DIR:-/opt/ykxmz-relay}"
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PUBLIC_URL="${PUBLIC_URL:-__PUBLIC_URL__}"
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FAIL_THRESHOLD="${FAIL_THRESHOLD:-3}"
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COOLDOWN="${COOLDOWN:-600}"
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CHECK_TIMEOUT="${CHECK_TIMEOUT:-8}"
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STATE="$RELAY_DIR/monitor_state.txt"
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LOG="$RELAY_DIR/monitor.log"
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LOCKFILE="/tmp/ykxmz-monitor.lock"
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if ! mkdir "$LOCKFILE" 2>/dev/null; then
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exit 0
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fi
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trap 'rmdir "$LOCKFILE" 2>/dev/null' EXIT
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log() { echo "$(date '+%F %T') $*" >> "$LOG"; }
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FAILS=0
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LAST_RESCUE=0
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if [ -f "$STATE" ]; then
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FAILS=$(grep -m1 '^fails=' "$STATE" 2>/dev/null | cut -d= -f2)
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LAST_RESCUE=$(grep -m1 '^last_rescue=' "$STATE" 2>/dev/null | cut -d= -f2)
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FAILS=${FAILS:-0}
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LAST_RESCUE=${LAST_RESCUE:-0}
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fi
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NOW=$(date +%s)
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CODE=$(curl -s -o /dev/null -w '%{http_code}' --max-time "$CHECK_TIMEOUT" \
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"$PUBLIC_URL/v1/health" 2>/dev/null)
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DUR=$(curl -s -o /dev/null -w '%{time_total}' --max-time "$CHECK_TIMEOUT" \
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"$PUBLIC_URL/v1/health" 2>/dev/null)
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DUR=${DUR:-0}
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write_state() {
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{
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echo "fails=$1"
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echo "last_rescue=$2"
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echo "last_code=$CODE"
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echo "last_check=$NOW"
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echo "last_dur=$DUR"
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} > "$STATE"
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}
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if [ "$CODE" = "200" ]; then
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if [ "$FAILS" != "0" ]; then
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log "公网恢复（HTTP 200，${DUR}s）—— 之前连续失败 $FAILS 次"
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fi
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PREV=$(grep -m1 '^last_code=' "$STATE" 2>/dev/null | cut -d= -f2)
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[ "$PREV" != "200" ] && log "公网正常（HTTP 200，${DUR}s）"
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write_state 0 "$LAST_RESCUE"
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exit 0
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fi
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FAILS=$((FAILS + 1))
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log "公网异常 第 $FAILS 次（HTTP ${CODE:-无响应}，${DUR}s）"
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write_state "$FAILS" "$LAST_RESCUE"
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if [ "$FAILS" -lt "$FAIL_THRESHOLD" ]; then
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exit 0
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fi
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SINCE=$((NOW - LAST_RESCUE))
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if [ "$LAST_RESCUE" != "0" ] && [ "$SINCE" -lt "$COOLDOWN" ]; then
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log " 已连续失败 $FAILS 次，但距上次抢救只过了 ${SINCE}s（冷却 ${COOLDOWN}s）"
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exit 0
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fi
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HINT=""
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if [ -f "$RELAY_DIR/rescue_knowledge.md" ]; then
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HINT=$(grep -oE '第 [0-9] 级奏效' "$RELAY_DIR/rescue_knowledge.md" 2>/dev/null \
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| sort | uniq -c | sort -rn | head -1 | grep -oE '[0-9]')
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fi
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log "连续失败 $FAILS 次，启动紧急预案${HINT:+（知识库提示：第 $HINT 级常奏效）}"
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write_state "$FAILS" "$NOW"
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timeout 300 bash "$RELAY_DIR/rescue-lightsail.sh" \
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"监测单元：公网连续 $FAILS 次不通" >> "$LOG" 2>&1
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RC=$?
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if [ "$RC" = "0" ]; then
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log " 预案完成：已恢复"
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else
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log " 预案完成：仍未恢复（退出码 $RC），报告在 rescue_reports/"
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fi
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exit 0
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'''
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SERVICE = '''[Unit]
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# ykxmz 网站监测单元（Lightsail 版）
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Description=ykxmz 网站监测单元（每 60 秒检查公网，异常时启动紧急预案）
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After=network-online.target ykxmz-relay.service
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Wants=network-online.target
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[Service]
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Type=oneshot
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TimeoutStartSec=360
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# 用普通用户跑 —— 它只读状态、调 systemctl restart，不需要 root。
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# （systemctl restart 那条走的是 polkit；admin 在 Lightsail 上有 sudo，
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# 所以脚本里用的是不带 sudo 的 systemctl —— 见下面的说明。）
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User=admin
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Group=admin
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Environment=RELAY_PORT=__PORT__
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Environment=PUBLIC_URL=__PUBLIC_URL__
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Environment=RESCUE_REBOOT=0
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Environment=FAIL_THRESHOLD=3
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Environment=COOLDOWN=600
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ExecStart=/bin/bash __DIR__/monitor.sh
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StandardOutput=append:__DIR__/monitor.log
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StandardError=append:__DIR__/monitor.log
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[Install]
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WantedBy=multi-user.target
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'''
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TIMER = '''[Unit]
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Description=每 60 秒检查一次网站是否可用
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[Timer]
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OnBootSec=45s
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OnUnitActiveSec=60s
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AccuracySec=5s
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Unit=ykxmz-monitor.service
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[Install]
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WantedBy=timers.target
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'''
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def main() -> int:
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print("=" * 62)
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print(" 在 Lightsail 上装监测单元 + 紧急预案")
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print("=" * 62)
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monitor = (MONITOR.replace("__PUBLIC_URL__", PUBLIC_URL))
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tmp = Path(tempfile.gettempdir())
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print()
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print(" ── 1. 传脚本 ──")
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mp = tmp / "monitor.sh"
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mp.write_text(monitor, encoding="utf-8", newline="\n")
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upload(str(mp), "%s/monitor.sh" % RELAY_DIR, mode=0o755)
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rp = ROOT / "relay" / "rescue-lightsail.sh"
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if rp.is_file():
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upload(str(rp), "%s/rescue-lightsail.sh" % RELAY_DIR, mode=0o755)
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else:
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print(" ✗ 找不到 relay/rescue-lightsail.sh")
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return 1
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print()
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print(" ── 2. 传 systemd 单元 ──")
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sp = tmp / "ykxmz-monitor.service"
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sp.write_text(SERVICE.replace("__PORT__", PORT)
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.replace("__PUBLIC_URL__", PUBLIC_URL)
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.replace("__DIR__", RELAY_DIR),
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encoding="utf-8", newline="\n")
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upload(str(sp), "/tmp/ykxmz-monitor.service")
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tp = tmp / "ykxmz-monitor.timer"
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tp.write_text(TIMER, encoding="utf-8", newline="\n")
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upload(str(tp), "/tmp/ykxmz-monitor.timer")
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print()
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print(" ── 3. 装单元 + 建目录 ──")
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out = run(
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"sudo mv /tmp/ykxmz-monitor.service /tmp/ykxmz-monitor.timer "
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"/etc/systemd/system/ && "
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"mkdir -p %s/rescue_reports && chmod +x %s/*.sh && "
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"if [ ! -f %s/rescue_knowledge.md ]; then "
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"printf '# 紧急预案知识库\\n\\n每次自动抢救成功会记一条「第几级奏效」。"
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"\\n下次同类症状优先试历史上奏效的那一级。\\n' > %s/rescue_knowledge.md; "
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"fi && sudo systemctl daemon-reload && echo OK"
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% (RELAY_DIR, RELAY_DIR, RELAY_DIR, RELAY_DIR), timeout=180)
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for ln in out[1].strip().splitlines():
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print(" " + ln)
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print()
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print(" ── 4. 启用定时器 ──")
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out = run("sudo systemctl enable --now ykxmz-monitor.timer 2>&1 | tail -2; "
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"sleep 2; systemctl is-active ykxmz-monitor.timer",
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timeout=180)
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for ln in out[1].strip().splitlines():
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print(" " + ln)
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print()
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print(" ── 5. 手动跑一次监测（验证它能工作）──")
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out = run("bash %s/monitor.sh; echo '--- 状态 ---'; "
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"cat %s/monitor_state.txt 2>/dev/null; "
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"echo '--- 日志 ---'; tail -3 %s/monitor.log 2>/dev/null"
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% (RELAY_DIR, RELAY_DIR, RELAY_DIR), timeout=180)
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for ln in out[1].strip().splitlines():
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print(" " + ln)
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print()
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print(" ── 6. 演练预案（网站正常时应该什么都不做）──")
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out = run("bash %s/rescue-lightsail.sh '安装验证（网站正常）' 2>&1 | tail -6; "
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"echo '--- 报告数（应该是 0）---'; "
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"ls %s/rescue_reports 2>/dev/null | wc -l"
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% (RELAY_DIR, RELAY_DIR), timeout=180)
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for ln in out[1].strip().splitlines():
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print(" " + ln)
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print()
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print(" ── 7. 总览 ──")
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out = run(
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"printf ' %-26s %s\\n' 'ykxmz-relay' \"$(systemctl is-active ykxmz-relay)\"; "
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"printf ' %-26s %s\\n' 'ykxmz-monitor.timer' \"$(systemctl is-active ykxmz-monitor.timer)\"; "
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"printf ' %-26s %s\\n' '本机 health' \"$(curl -s -o /dev/null -w '%%{http_code}' http://127.0.0.1:%s/v1/health)\"; "
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"printf ' %-26s %s\\n' '公网 health' \"$(curl -s -o /dev/null -w '%%{http_code}' %s/v1/health)\""
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% (PORT, PUBLIC_URL), timeout=180)
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for ln in out[1].strip().splitlines():
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print(" " + ln)
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print()
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print(" 说明：预案里用 systemctl 重启服务，而 monitor.service 以 admin")
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print(" 身份跑 —— admin 在 Lightsail 上有免密 sudo，但脚本里没加")
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print(" sudo。如果实测发现重启失败，把它改成 sudo systemctl 即可。")
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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