Question

使用Google App Engine时，PyCharm Professional调试器存在一个问题。调试由我的代码手动启动的线程时，断点不起作用这会影响调试dev_appserver上运行的代码的能力，该代码使用threading.Thread或concurrent.futures.ThreadPoolExecutor 2.7 backport（现在GAE正式支持）

问题出现在PyCharm 2017.2和2017.3.4中。在Ubuntu Linux上观察GAE SDK 1.9.66。

这是一个repro代码 - 从任何请求处理程序调用它。

from concurrent.futures import ThreadPoolExecutor, wait
from threading import Thread
def worker():
    logging.info("Worker")  # set breakpoint here
    time.sleep(3)

def call_this():  # call this from your request handler
    tpe = ThreadPoolExecutor(max_workers=5)
    futures = [tpe.submit(worker) for i in range(10)]
    wait(futures)
    threads = [Thread(worker) for i in range(10)]
    for t in threads: t.start()
    for t in threads: t.join()

Answer 1

快速解决方法是修补patch_threads行<pycharm-folder>/helpers/pydev/pydevd.py附近的978功能，并为单独的GAE模块添加settrace：

 def patch_threads(self):
    try:
        # not available in jython!
        import threading
        threading.settrace(self.trace_dispatch)  # for all future threads
        from google.appengine.dist27 import threading as gae_threading
        gae_threading.settrace(self.trace_dispatch)  # for all future threads
    except Exception as e:
        pass

    from _pydev_bundle.pydev_monkey import patch_thread_modules
    patch_thread_modules()

针对Google App Engine的Thread上的Pycharm断点

1 个答案: