flask 异步任务celery中运行ipython或python repl出现阻塞

问题场景：上传文件

调用上传文件接口，异步任务解析文件，解析中需要执行python代码，此时会出现阻塞

启动celery命令

 celery -A app.celery worker -P gevent -c 1 --loglevel INFO   -Q nltable

代码：

import logging
import time
import datetime
from celery import shared_task
from services.nltable.table_async_service import TableAsyncService
import asyncio


logger = logging.getLogger(__name__)


@shared_task(queue='nltable')
def async_read_table_info_task(enterprise_id: str, table_id: str):
    """
    异步添加读取表格信息任务到队列
    Usage: async_read_table_info_task.delay(enterprise_id, table_id)
    """
    start_at = time.perf_counter()
    current_time = datetime.datetime.now()
    formatted_time = current_time.strftime("%Y-%m-%d %H:%M:%S")
    logger.info(
        f"开始添加读取表格信息任务到队列, [{formatted_time}] enterprise_id: {enterprise_id}, table_id: {table_id} ")
    TableAsyncService.sync_update_table_infos(enterprise_id, table_id)

    end_at = time.perf_counter()

    logger.info(f"读取表格信息任务添加到队列成功, 耗时: {end_at - start_at:.2f}秒")

class TableAsyncService:

    @staticmethod
    def sync_update_table_infos(enterprise_id: str, table_id: str) -> Optional[Table]:
        """
        同步更新表格信息
        """
        logger.info("start")
        from langchain_experimental.utilities import PythonREPL
        logger.info("2222")
        python_repl = PythonREPL()
        logger.info("111")
        res = python_repl.run("print(1)")
        logger.info(res)

执行结果

[2024-12-25 18:17:32,517: INFO/MainProcess] Task tasks.read_table_tasks.async_read_table_info_task[92ae44b2-d791-4706-960a-477ef70206d3] received
[2024-12-25 18:17:32,518: INFO/MainProcess] 开始添加读取表格信息任务到队列, [2024-12-25 18:17:32] enterprise_id: 1750727272898039810, table_id: eb9d87a6-6bac-47ec-8e7d-5598259aa760    
[2024-12-25 18:17:32,518: INFO/MainProcess] start
[2024-12-25 18:17:32,518: INFO/MainProcess] 2222
[2024-12-25 18:17:32,518: INFO/MainProcess] 111
[2024-12-25 18:17:32,519: WARNING/MainProcess] Python REPL can execute arbitrary code. Use with caution.

参考说明文档
https://docs.celeryq.dev/en/stable/userguide/application.html

    @classmethod
    def worker(
        cls,
        command: str,
        globals: Optional[Dict],
        locals: Optional[Dict],
        queue: multiprocessing.Queue,
    ) -> None:
        old_stdout = sys.stdout
        sys.stdout = mystdout = StringIO()
        try:
            logger.info("self.worker")
            cleaned_command = cls.sanitize_input(command)
            exec(cleaned_command, globals, locals)
            sys.stdout = old_stdout
            logger.info(f"sys.stdout {sys.stdout}")
            logger.info(f"{mystdout.getvalue()}")
            queue.put(mystdout.getvalue())
            logger.info(f"put")

        except Exception as e:
            sys.stdout = old_stdout
            queue.put(repr(e))

    def run(self, command: str, timeout: Optional[int] = None) -> str:
        """Run command with own globals/locals and returns anything printed.
        Timeout after the specified number of seconds."""

        # Warn against dangers of PythonREPL
        warn_once()

        queue: multiprocessing.Queue = multiprocessing.Queue()
        logger.info(f"langchain 123 {timeout}  {queue}")
        # Only use multiprocessing if we are enforcing a timeout
        if timeout is not None:
            # create a Process
            p = multiprocessing.Process(
                target=self.worker, args=(command, self.globals, self.locals, queue)
            )

            # start it
            p.start()

            # wait for the process to finish or kill it after timeout seconds
            p.join(timeout)

            if p.is_alive():
                p.terminate()
                return "Execution timed out"
        else:
            self.worker(command, self.globals, self.locals, queue)
        # get the result from the worker function
        logger.info(f"queue.get {queue.get()}")
        return queue.get()

执行结果

[2024-12-26 09:29:57,229: INFO/MainProcess] langchain 123 None  <multiprocessing.queues.Queue object at 0x0000021FB5C92BD0>
[2024-12-26 09:29:57,229: INFO/MainProcess] self.worker
[2024-12-26 09:29:57,230: INFO/MainProcess] sys.stdout <celery.utils.log.LoggingProxy object at 0x0000021FB5B37E50>
[2024-12-26 09:29:57,230: INFO/MainProcess] 1

[2024-12-26 09:29:57,230: INFO/MainProcess] put

无法执行

        logger.info(f"queue.get {queue.get()}")
        return queue.get()
  1. 尝试设置超时时间
        res = python_repl.run("print(1)",timeout=10)
        logger.info(f"res {res}")

此时能执行run方法中的日志

[2024-12-26 09:57:00,765: INFO/MainProcess] queue.get 1

但return语句出现阻塞

  1. 测试去掉方法，直接在任务中执行

class TableAsyncService:

    @staticmethod
    def sync_update_table_infos(enterprise_id: str, table_id: str) -> Optional[Table]:
        """
        同步更新表格信息
        """
        from langchain_experimental.utilities import PythonREPL
        from gevent.queue import Queue
        from gevent import spawn

        queue: multiprocessing.Queue = multiprocessing.Queue()
        python_repl = PythonREPL()
        p = multiprocessing.Process(
            target=python_repl.worker, args=("print(1)", {}, {}, queue)
        )

        # start it
        p.start()

        # wait for the process to finish or kill it after timeout seconds
        p.join(10)
        print(f"res {queue.get()}")

此时能够正常运行

  1. 进一步封装成方法
class TableAsyncService:
    @staticmethod
    def run_command(command:str,queue: multiprocessing.Queue):
        from langchain_experimental.utilities import PythonREPL

        python_repl = PythonREPL()
        p = multiprocessing.Process(
            target=python_repl.worker, args=("print(1)", {}, {}, queue)
        )

        # start it
        p.start()

        # wait for the process to finish or kill it after timeout seconds
        p.join(10)
        print("return")
        return queue.get()
	  @staticmethod
    def sync_update_table_infos(enterprise_id: str, table_id: str) -> Optional[Table]:
        """
        同步更新表格信息
        """
        queue: multiprocessing.Queue = multiprocessing.Queue()
        res = TableAsyncService.run_command("print(1)",queue)
        print(f"res {res}")

此时也可以正常运行

其他方案：
尝试使用spawn+multiprocessing queue

class TableAsyncService:
    @staticmethod
    def sync_update_table_infos(enterprise_id: str, table_id: str) -> Optional[Table]:
        """
        同步更新表格信息
        """
        from gevent import spawn

        # queue: multiprocessing.Queue = multiprocessing.Queue()
        # res = TableAsyncService.run_command("print(1)",queue)
        # print(f"res {res}")

        from langchain_experimental.utilities import PythonREPL

        python_repl = PythonREPL()
        queue = multiprocessing.Queue()
        command = "print(1)"
        greelet = spawn(python_repl.worker,command,{},{},queue)
        greelet.join(10)
        result = queue.get()
        logger.info(f"res {result}")

能够正常运行

测试发现，如果queue在内置里初始化，return queue.get无法输出

两种方式的代码集合：

class TableAsyncService:
    @staticmethod
    def run_command(command:str,queue: multiprocessing.Queue):
        from langchain_experimental.utilities import PythonREPL

        python_repl = PythonREPL()
        p = multiprocessing.Process(
            target=python_repl.worker, args=(command, {}, {}, queue)
        )

        # start it
        p.start()

        # wait for the process to finish or kill it after timeout seconds
        p.join(10)

        return queue.get()

    @staticmethod
    def sync_update_table_infos(enterprise_id: str, table_id: str) -> Optional[Table]:
        """
        同步更新表格信息
        """
        start_time = time.time()
        queue: multiprocessing.Queue = multiprocessing.Queue()
        res = TableAsyncService.run_command("print(1)",queue)
        print(f"res {res}")
        end_time = time.time()
        print(f" 耗时: {end_time - start_time}")

        from langchain_experimental.utilities import PythonREPL
        from gevent import spawn
        python_repl = PythonREPL()
        queue = multiprocessing.Queue()
        command = "print(1)"
        start_time = time.time()
        greelet = spawn(python_repl.worker,command,{},{},queue)
        greelet.join(10)
        result = queue.get()
        logger.info(f"res {result}")
        end_time = time.time()
        print(f" 耗时: {end_time - start_time}")
		
		
import logging
import time
import datetime
from celery import shared_task
from services.nltable.table_async_service import TableAsyncService


logger = logging.getLogger(__name__)


@shared_task(queue='nltable')
def async_read_table_info_task(enterprise_id: str, table_id: str):
    """
    异步添加读取表格信息任务到队列
    Usage: async_read_table_info_task.delay(enterprise_id, table_id)
    """
    start_at = time.perf_counter()
    current_time = datetime.datetime.now()
    formatted_time = current_time.strftime("%Y-%m-%d %H:%M:%S")
    logger.info(
        f"开始添加读取表格信息任务到队列, [{formatted_time}] enterprise_id: {enterprise_id}, table_id: {table_id} ")
    TableAsyncService.sync_update_table_infos(enterprise_id, table_id)

    end_at = time.perf_counter()

    logger.info(f"读取表格信息任务添加到队列成功, 耗时: {end_at - start_at:.2f}秒")

耗时对比


[2024-12-26 11:28:37,189: WARNING/MainProcess] res 1
[2024-12-26 11:28:37,190: WARNING/MainProcess]  耗时: 16.56423830986023
[2024-12-26 11:28:37,332: INFO/MainProcess] res 1

[2024-12-26 11:28:37,333: WARNING/MainProcess]  耗时: 0.14260435104370117

作者：Gim

出处：https://www.cnblogs.com/Gimm/p/18631651

版权：本作品采用「署名-非商业性使用-相同方式共享 4.0 国际」许可协议进行许可。

posted @   踩坑大王  阅读(10)  评论(0)  编辑  收藏  举报
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