#!/bin/sh
# uhttpd 进程监控守护进程 2025-2026 by sirpdboy 

PROG="uhttpd-watchdog"
UHTTPD_BIN="/usr/sbin/uhttpd"
UHTTPD_SERVICE="uhttpd"
CHECK_INTERVAL=30  # 检查间隔（秒）
MAX_FAILURES=3     # 最大连续失败次数
LOG_IDENT="$PROG"

log() {
    logger -t "$LOG_IDENT" "$1"
}

check_binary() {
    if [ ! -x "$UHTTPD_BIN" ]; then
        log "错误：$UHTTPD_BIN 不存在或不可执行，监控停止"
        return 1
    fi
    return 0
}

check_process() {
    if pgrep -f "/usr/sbin/uhttpd" >/dev/null 2>&1 || \
       pgrep -x uhttpd >/dev/null 2>&1; then
                return 0
    fi
    return 1
}

restart_service() {
    log "尝试重启 $UHTTPD_SERVICE 服务..."
    if /etc/init.d/$UHTTPD_SERVICE restart >/dev/null 2>&1; then
        sleep 3  # 等待服务启动
        if check_process; then
            log "$UHTTPD_SERVICE 重启成功"
            return 0
        else
            log "$UHTTPD_SERVICE 重启后进程仍不存在"
            return 1
        fi
    else
        log "执行 service $UHTTPD_SERVICE restart 失败"
        return 1
    fi
}

monitor_loop() {
    local failures=0
    
    log "启动 $UHTTPD_SERVICE 监控守护进程"
    
    while true; do
        # 检查二进制文件
        if ! check_binary; then
            sleep 60
            continue
        fi
        
        # 检查进程状态
        if ! check_process; then
            failures=$((failures + 1))
            log "检测到 $UHTTPD_SERVICE 进程停止 (失败次数: $failures/$MAX_FAILURES)"
            
            if [ $failures -ge $MAX_FAILURES ]; then
                log "达到最大失败次数，尝试重启服务..."
                if restart_service; then
                    failures=0
                else
                    sleep 60
                fi
            fi
        else
            # 进程正常，重置失败计数器
            if [ $failures -gt 0 ]; then
                log "$UHTTPD_SERVICE 恢复正常运行"
                failures=0
            fi
        fi
        
        sleep $CHECK_INTERVAL
    done
}

start() {
    if pgrep -f "$PROG" | grep -v $$ >/dev/null 2>&1; then
        log "警告：$PROG 已经在运行"
        exit 1
    fi
    monitor_loop
}

stop() {
    pkill -f "$PROG" 2>/dev/null
    log "监控服务已停止"
}

case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    *)
        echo "用法: $0 {start|stop}"
        exit 1
        ;;
esac