request.json_body generates unclosed file ResourceWarning

[hyperknot]

Inserting a simple request.json_body in a POST view generates a ResourceWarning: unclosed file <_io.BufferedRandom name=15>.

There is nothing else in the request, just a single line of request.json_body.

Interestingly this only happens the 2nd time a view is requested. Not the 1st, 3rd, 4th, 5th times, only the 2nd time. 100% reproducible.

Tracemalloc:

.pyenv/versions/3.7.10/lib/python3.7/json/decoder.py:353: ResourceWarning: unclosed file <_io.BufferedRandom name=15>
  obj, end = self.scan_once(s, idx)
Object allocated at (most recent call last):
  File ".pyenv/versions/3.7.10/lib/python3.7/threading.py", lineno 890
    self._bootstrap_inner()
  File ".pyenv/versions/3.7.10/lib/python3.7/threading.py", lineno 926
    self.run()
  File ".pyenv/versions/3.7.10/lib/python3.7/threading.py", lineno 870
    self._target(*self._args, **self._kwargs)
  File "venv/lib/python3.7/site-packages/waitress/task.py", lineno 84
    task.service()
  File "venv/lib/python3.7/site-packages/waitress/channel.py", lineno 397
    task.service()
  File "venv/lib/python3.7/site-packages/waitress/task.py", lineno 168
    self.execute()
  File "venv/lib/python3.7/site-packages/waitress/task.py", lineno 434
    app_iter = self.channel.server.application(environ, start_response)
  File "venv/lib/python3.7/site-packages/paste/translogger.py", lineno 69
    return self.application(environ, replacement_start_response)
  File "venv/lib/python3.7/site-packages/pyramid/router.py", lineno 274
    response = self.execution_policy(environ, self)
  File "venv/lib/python3.7/site-packages/pyramid/router.py", lineno 281
    return router.invoke_request(request)
  File "venv/lib/python3.7/site-packages/pyramid/router.py", lineno 249
    response = handle_request(request)
  File "venv/lib/python3.7/site-packages/pyramid_tm/__init__.py", lineno 143
    response = handler(request)
  File "venv/lib/python3.7/site-packages/pyramid/tweens.py", lineno 41
    response = handler(request)
  File "venv/lib/python3.7/site-packages/pyramid/router.py", lineno 148
    registry, request, context, context_iface, view_name
  File "venv/lib/python3.7/site-packages/pyramid/view.py", lineno 683
    response = view_callable(context, request)
  File "venv/lib/python3.7/site-packages/pyramid/config/views.py", lineno 188
    return view(context, request)
  File "venv/lib/python3.7/site-packages/pyramid/config/views.py", lineno 214
    return view(context, request)
  File "venv/lib/python3.7/site-packages/pyramid/viewderivers.py", lineno 325
    return view(context, request)
  File "venv/lib/python3.7/site-packages/pyramid/viewderivers.py", lineno 514
    return view(context, request)
  File "web/server/maphub_web/security.py", lineno 109
    response = view(context, request)
  File "web/server/maphub_web/security.py", lineno 93
    response = view(context, request)
  File "venv/lib/python3.7/site-packages/pyramid/viewderivers.py", lineno 436
    result = view(context, request)
  File "venv/lib/python3.7/site-packages/pyramid/viewderivers.py", lineno 144
    response = view(request)
  File "web/server/maphub_web/views/json/map/map_save.py", lineno 23
    data = request.json_body
  File "venv/lib/python3.7/site-packages/pyramid/request.py", lineno 231
    return json.loads(text_(self.body, self.charset))
  File "venv/lib/python3.7/site-packages/webob/request.py", lineno 693
    self.make_body_seekable() # we need this to have content_length
  File "venv/lib/python3.7/site-packages/webob/request.py", lineno 929
    self.copy_body()
  File "venv/lib/python3.7/site-packages/webob/request.py", lineno 979
    fileobj = self.make_tempfile()
  File "venv/lib/python3.7/site-packages/webob/request.py", lineno 1019
    return tempfile.TemporaryFile()
  File ".pyenv/versions/3.7.10/lib/python3.7/tempfile.py", lineno 622
    newline=newline, encoding=encoding)
    ```
    
WebOb==1.8.7
pyramid==1.10.8
waitress==2.0.0 (same with 1.x)

Related issues:
https://github.com/Pylons/webob/issues/416
https://github.com/Pylons/pyramid/issues/3599

[digitalresistor]

Related/same issue: #427 #428 #416 #415

Closing in favor of #415