161 lines
4.6 KiB
Python
161 lines
4.6 KiB
Python
# main_start.py
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# 主启动脚本：读取配置并通过 subprocess 启动 rtsp_service_ws_kadian.py
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# 支持 start 和 status 命令，默认执行 start
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import json
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import yaml
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import base64
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import subprocess
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import sys
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import os
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import signal
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import argparse
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from typing import List
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from common.camera_config import CameraConfig
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from utils.logger import get_logger
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logger = get_logger(__name__)
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# PID 文件路径
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PID_FILE = "rtsp_service.pid"
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def load_cameras_from_yaml(config_path: str = "config.yaml") -> List[dict]:
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"""从 YAML 文件加载摄像头配置"""
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with open(config_path, "r", encoding="utf-8") as f:
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cfg = yaml.safe_load(f)
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return cfg.get("cameras", [])
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def cameras_to_base64_json(cameras: List[dict]) -> str:
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"""将摄像头配置转换为 base64 编码的 JSON 字符串"""
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json_str = json.dumps(cameras, ensure_ascii=False)
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return base64.b64encode(json_str.encode('utf-8')).decode('ascii')
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def start_rtsp_service(cameras_base64: str, script_path: str = "rtsp_service_ws_kadian.py"):
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"""启动 RTSP 服务子进程（后台运行）"""
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cmd = [
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sys.executable, # 当前 Python 解释器路径
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script_path,
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"--cameras", cameras_base64
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]
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logger.info(f"[INFO] Starting RTSP service with command: python {script_path} --cameras <base64_config>")
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# 使用 start_new_session=True 创建新会话，类似 nohup 效果
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process = subprocess.Popen(cmd, start_new_session=True)
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return process
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def save_pid(pid: int):
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"""保存进程ID到文件"""
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try:
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with open(PID_FILE, "w") as f:
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f.write(str(pid))
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logger.info(f"[INFO] Saved PID {pid} to {PID_FILE}")
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except Exception as e:
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logger.error(f"[ERROR] Failed to save PID file: {e}")
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def read_pid():
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"""从PID文件读取进程ID"""
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try:
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with open(PID_FILE, "r") as f:
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return int(f.read().strip())
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except FileNotFoundError:
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logger.warning(f"[WARN] PID file {PID_FILE} not found")
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return None
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except Exception as e:
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logger.error(f"[ERROR] Failed to read PID file: {e}")
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return None
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def is_process_running(pid: int):
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"""检查进程是否在运行"""
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try:
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# 发送信号0，不实际发送信号，仅检查进程是否存在
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os.kill(pid, 0)
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return True
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except OSError:
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return False
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def start_service():
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"""启动服务"""
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# 检查是否已经在运行
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pid = read_pid()
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if pid and is_process_running(pid):
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logger.warning(f"[WARN] Service is already running with PID {pid}")
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return False
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config_path = "config.yaml"
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# 1. 读取配置
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cameras_data = load_cameras_from_yaml(config_path)
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logger.info(f"[INFO] Loaded {len(cameras_data)} cameras from {config_path}")
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if not cameras_data:
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logger.error("[ERROR] No cameras found in config, exiting...")
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return False
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# 2. 转换为 base64 JSON
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cameras_base64 = cameras_to_base64_json(cameras_data)
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# 3. 启动子进程
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try:
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process = start_rtsp_service(cameras_base64)
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# 等待一下确保进程启动
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import time
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time.sleep(1)
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# 4. 保存PID
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save_pid(process.pid)
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logger.info(f"[INFO] Service started successfully with PID {process.pid}")
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logger.info("[INFO] Main process exiting, service will continue running in background")
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return True
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except Exception as e:
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logger.error(f"[ERROR] Failed to start service: {e}")
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return False
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def status_service():
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"""检查服务状态"""
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pid = read_pid()
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if not pid:
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logger.info("[INFO] Service is not running (no PID file)")
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return False
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if is_process_running(pid):
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logger.info(f"[INFO] Service is running with PID {pid}")
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return True
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else:
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logger.info(f"[INFO] Service is not running (PID {pid} not found), cleaning up PID file")
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try:
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os.remove(PID_FILE)
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except:
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pass
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return False
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def main():
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parser = argparse.ArgumentParser(description="RTSP Service Manager")
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parser.add_argument("command", nargs="?", choices=["start", "status"], default="start",
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help="Command to execute: start, status (default: start)")
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args = parser.parse_args()
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if args.command == "start":
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success = start_service()
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sys.exit(0 if success else 1)
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elif args.command == "status":
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success = status_service()
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sys.exit(0 if success else 0) # 状态检查总是返回0退出码
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if __name__ == "__main__":
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main()
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