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[Bug 1667579] [NEW] swift-proxy-server fails to start with Python 3.5

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Public bug reported:

Traceback (most recent call last):
  File "/usr/local/bin/swift-proxy-server", line 6, in <module>
    exec(compile(open(__file__).read(), __file__, 'exec'))
  File "/opt/stack/new/swift/bin/swift-proxy-server", line 23, in <module>
    sys.exit(run_wsgi(conf_file, 'proxy-server', **options))
  File "/opt/stack/new/swift/swift/common/wsgi.py", line 905, in run_wsgi
    loadapp(conf_path, global_conf=global_conf)
  File "/opt/stack/new/swift/swift/common/wsgi.py", line 389, in loadapp
    ctx = loadcontext(loadwsgi.APP, conf_file, global_conf=global_conf)
  File "/opt/stack/new/swift/swift/common/wsgi.py", line 373, in loadcontext
    global_conf=global_conf)
  File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 296, in loadcontext
    global_conf=global_conf)
  File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 320, in _loadconfig
    return loader.get_context(object_type, name, global_conf)
  File "/opt/stack/new/swift/swift/common/wsgi.py", line 66, in get_context
    object_type, name=name, global_conf=global_conf)
  File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 450, in get_context
    global_additions=global_additions)
  File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 562, in _pipeline_app_context
    for name in pipeline[:-1]]
  File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 562, in <listcomp>
    for name in pipeline[:-1]]
  File "/opt/stack/new/swift/swift/common/wsgi.py", line 66, in get_context
    object_type, name=name, global_conf=global_conf)
  File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 454, in get_context
    section)
  File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 476, in _context_from_use
    object_type, name=use, global_conf=global_conf)
  File "/opt/stack/new/swift/swift/common/wsgi.py", line 66, in get_context
    object_type, name=name, global_conf=global_conf)
  File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 406, in get_context
    global_conf=global_conf)
  File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 296, in loadcontext
    global_conf=global_conf)
  File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 328, in _loadegg
    return loader.get_context(object_type, name, global_conf)
  File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 620, in get_context
    object_type, name=name)
  File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 646, in find_egg_entry_point
    possible.append((entry.load(), protocol, entry.name))
  File "/usr/local/lib/python3.5/dist-packages/pkg_resources/__init__.py", line 2302, in load
    return self.resolve()
  File "/usr/local/lib/python3.5/dist-packages/pkg_resources/__init__.py", line 2308, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/opt/stack/new/swift/swift/common/middleware/slo.py", line 799
    def is_small_segment((seg_dict, start_byte, end_byte)):
                         ^
SyntaxError: invalid syntax

http://logs.openstack.org/14/437514/3/check/gate-rally-dsvm-py35
-neutron-neutron-ubuntu-xenial/3221186/logs/screen-s-proxy.txt.gz

This currently blocks neutron gate where we have a voting py3 tempest
job. The reason why swift is deployed with Python3.5 there is because we
special case in devstack to deploy the service with Python3:

http://git.openstack.org/cgit/openstack-
dev/devstack/tree/inc/python#n167

The short term solution is to disable the special casing. Swift should
then work on fixing the code, and gate on Python3 (preferably the same
job as neutron has).

** Affects: devstack
     Importance: Undecided
     Assignee: Ihar Hrachyshka (ihar-hrachyshka)
         Status: In Progress

** Affects: neutron
     Importance: Critical
     Assignee: Ihar Hrachyshka (ihar-hrachyshka)
         Status: Confirmed

** Affects: swift
     Importance: Undecided
         Status: New

** Also affects: neutron
   Importance: Undecided
       Status: New

** Also affects: devstack
   Importance: Undecided
       Status: New

** Changed in: neutron
       Status: New => Confirmed

** Changed in: neutron
   Importance: Undecided => Critical

** Changed in: neutron
     Assignee: (unassigned) => Ihar Hrachyshka (ihar-hrachyshka)

** Changed in: devstack
       Status: New => Confirmed

** Changed in: devstack
     Assignee: (unassigned) => Ihar Hrachyshka (ihar-hrachyshka)

-- 
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https://bugs.launchpad.net/bugs/1667579

Title:
  swift-proxy-server fails to start with Python 3.5

Status in devstack:
  In Progress
Status in neutron:
  Confirmed
Status in OpenStack Object Storage (swift):
  New

Bug description:
  Traceback (most recent call last):
    File "/usr/local/bin/swift-proxy-server", line 6, in <module>
      exec(compile(open(__file__).read(), __file__, 'exec'))
    File "/opt/stack/new/swift/bin/swift-proxy-server", line 23, in <module>
      sys.exit(run_wsgi(conf_file, 'proxy-server', **options))
    File "/opt/stack/new/swift/swift/common/wsgi.py", line 905, in run_wsgi
      loadapp(conf_path, global_conf=global_conf)
    File "/opt/stack/new/swift/swift/common/wsgi.py", line 389, in loadapp
      ctx = loadcontext(loadwsgi.APP, conf_file, global_conf=global_conf)
    File "/opt/stack/new/swift/swift/common/wsgi.py", line 373, in loadcontext
      global_conf=global_conf)
    File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 296, in loadcontext
      global_conf=global_conf)
    File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 320, in _loadconfig
      return loader.get_context(object_type, name, global_conf)
    File "/opt/stack/new/swift/swift/common/wsgi.py", line 66, in get_context
      object_type, name=name, global_conf=global_conf)
    File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 450, in get_context
      global_additions=global_additions)
    File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 562, in _pipeline_app_context
      for name in pipeline[:-1]]
    File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 562, in <listcomp>
      for name in pipeline[:-1]]
    File "/opt/stack/new/swift/swift/common/wsgi.py", line 66, in get_context
      object_type, name=name, global_conf=global_conf)
    File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 454, in get_context
      section)
    File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 476, in _context_from_use
      object_type, name=use, global_conf=global_conf)
    File "/opt/stack/new/swift/swift/common/wsgi.py", line 66, in get_context
      object_type, name=name, global_conf=global_conf)
    File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 406, in get_context
      global_conf=global_conf)
    File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 296, in loadcontext
      global_conf=global_conf)
    File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 328, in _loadegg
      return loader.get_context(object_type, name, global_conf)
    File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 620, in get_context
      object_type, name=name)
    File "/usr/local/lib/python3.5/dist-packages/paste/deploy/loadwsgi.py", line 646, in find_egg_entry_point
      possible.append((entry.load(), protocol, entry.name))
    File "/usr/local/lib/python3.5/dist-packages/pkg_resources/__init__.py", line 2302, in load
      return self.resolve()
    File "/usr/local/lib/python3.5/dist-packages/pkg_resources/__init__.py", line 2308, in resolve
      module = __import__(self.module_name, fromlist=['__name__'], level=0)
    File "/opt/stack/new/swift/swift/common/middleware/slo.py", line 799
      def is_small_segment((seg_dict, start_byte, end_byte)):
                           ^
  SyntaxError: invalid syntax

  http://logs.openstack.org/14/437514/3/check/gate-rally-dsvm-py35
  -neutron-neutron-ubuntu-xenial/3221186/logs/screen-s-proxy.txt.gz

  This currently blocks neutron gate where we have a voting py3 tempest
  job. The reason why swift is deployed with Python3.5 there is because
  we special case in devstack to deploy the service with Python3:

  http://git.openstack.org/cgit/openstack-
  dev/devstack/tree/inc/python#n167

  The short term solution is to disable the special casing. Swift should
  then work on fixing the code, and gate on Python3 (preferably the same
  job as neutron has).

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