我正在运行龙卷风与stream_request_body和保存文件POST请求到服务器上的文件。在prepare中，我创建文件对象，在post中，我创建close文件对象。我如何捕获data_received中的任何错误/异常，以便我可以正确地close文件对象?
from tornado.ioloop import IOLoop
from tornado.web import Application, RequestHandler, stream_request_body
@stream_request_body
class UploadHandler(RequestHandler):
def prepare(self):
self.file = open('uploaded_file', 'wb')
def data_received(self, chunk):
print(len(chunk))
self.file.write(chunk)
# force an exception
raise Exception('Error')
def post(self, *args, **kwargs):
self.file.close()
self.write('UPLOADED')
app = Application([(r'/upload', UploadHandler), ],
debug=True)
if __name__ == '__main__':
app.listen(7777)
IOLoop.current().start()
龙卷风应用运行的终端输出
$ python upload.py
232
ERROR:tornado.application:Uncaught exception
Traceback (most recent call last):
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib64/python3.6/site-packages/tornado/http1connection.py", line 659, in _read_fixed_body
ret = delegate.data_received(body)
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib64/python3.6/site-packages/tornado/routing.py", line 264, in data_received
return self.delegate.data_received(chunk)
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib64/python3.6/site-packages/tornado/web.py", line 2279, in data_received
return self.handler.data_received(data)
File "upload.py", line 13, in data_received
raise Exception('Error')
Exception: Error
终端输出与python解释器的请求
>>> resp=requests.post('http://localhost:7777/upload', files={'file': open('test.txt', 'rb')})
Traceback (most recent call last):
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/urllib3/connectionpool.py", line 706, in urlopen
chunked=chunked,
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/urllib3/connectionpool.py", line 445, in _make_request
six.raise_from(e, None)
File "<string>", line 3, in raise_from
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/urllib3/connectionpool.py", line 440, in _make_request
httplib_response = conn.getresponse()
File "/usr/lib64/python3.6/http/client.py", line 1346, in getresponse
response.begin()
File "/usr/lib64/python3.6/http/client.py", line 307, in begin
version, status, reason = self._read_status()
File "/usr/lib64/python3.6/http/client.py", line 276, in _read_status
raise RemoteDisconnected("Remote end closed connection without"
http.client.RemoteDisconnected: Remote end closed connection without response
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/requests/adapters.py", line 449, in send
timeout=timeout
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/urllib3/connectionpool.py", line 756, in urlopen
method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/urllib3/util/retry.py", line 532, in increment
raise six.reraise(type(error), error, _stacktrace)
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/urllib3/packages/six.py", line 734, in reraise
raise value.with_traceback(tb)
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/urllib3/connectionpool.py", line 706, in urlopen
chunked=chunked,
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/urllib3/connectionpool.py", line 445, in _make_request
six.raise_from(e, None)
File "<string>", line 3, in raise_from
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/urllib3/connectionpool.py", line 440, in _make_request
httplib_response = conn.getresponse()
File "/usr/lib64/python3.6/http/client.py", line 1346, in getresponse
response.begin()
File "/usr/lib64/python3.6/http/client.py", line 307, in begin
version, status, reason = self._read_status()
File "/usr/lib64/python3.6/http/client.py", line 276, in _read_status
raise RemoteDisconnected("Remote end closed connection without"
urllib3.exceptions.ProtocolError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response',))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/requests/api.py", line 119, in post
return request('post', url, data=data, json=json, **kwargs)
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/requests/api.py", line 61, in request
return session.request(method=method, url=url, **kwargs)
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/requests/sessions.py", line 542, in request
resp = self.send(prep, **send_kwargs)
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/requests/sessions.py", line 655, in send
r = adapter.send(request, **kwargs)
File "/prog/res/komodo/2021.08.03-py36-rhel7/root/lib/python3.6/site-packages/requests/adapters.py", line 498, in send
raise ConnectionError(err, request=request)
requests.exceptions.ConnectionError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response',))
RequestHandler有一个on_connection_close方法，当连接关闭时调用。你可以覆盖它来关闭文件对象:
class UploadHandler(...):
...
def on_connection_close(self):
self.file.close()