[Part1] Remove six

We don't need this in a Python 3-only world.
Remove six in follows:
1. zaqar/common/transport/wsgi/helpers.py
2. zaqar/common/urls.py
3. zaqar/common/utils.py
4. zaqar/notification/notifier.py
5. zaqar/notification/tasks/mailto.py

Change-Id: Iae6d4f415b215b9fdf675a0fcf00282fc98d58b7

lower-constraints.txt

@@ -51,7 +51,6 @@ requests==2.14.2
 requestsexceptions==1.2.0
 restructuredtext-lint==1.1.1
 rfc3986==0.3.1
-six==1.10.0
 SQLAlchemy==1.3.19
 sqlalchemy-migrate==0.11.0
 stestr==2.0.0

requirements.txt

@@ -15,7 +15,6 @@ python-memcached>=1.56 # PSF
 python-swiftclient>=3.2.0 # Apache-2.0
 WebOb>=1.7.1 # MIT
 stevedore>=1.20.0 # Apache-2.0
-six>=1.10.0 # MIT
 oslo.cache>=1.26.0 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0
 oslo.context>=2.19.2 # Apache-2.0

zaqar/common/transport/wsgi/helpers.py

@@ -21,7 +21,6 @@ import uuid
 
 import falcon
 from oslo_log import log as logging
-import six
 
 from zaqar.common import urls
 from zaqar import context
@@ -131,7 +130,7 @@ def require_client_id(validate, req, resp, params):
             description = _(u'Malformed hexadecimal UUID.')
             raise falcon.HTTPBadRequest('Wrong UUID value', description)
         except validation.ValidationFailed as ex:
-            raise falcon.HTTPBadRequest(six.text_type(ex))
+            raise falcon.HTTPBadRequest(str(ex))
     else:
         # NOTE(wanghao): Since we changed the get_client_uuid to support
         # other format of client id, so need to check the uuid here for
@@ -174,8 +173,6 @@ def validate_queue_identification(validate, req, resp, params):
     except validation.ValidationFailed:
         project = params['project_id']
         queue = params['queue_name']
-        if six.PY2:
-            queue = queue.decode('utf-8', 'replace')
 
         LOG.debug(u'Invalid queue name "%(queue)s" submitted for '
                   u'project: %(project)s',
@@ -308,8 +305,6 @@ def validate_topic_identification(validate, req, resp, params):
     except validation.ValidationFailed:
         project = params['project_id']
         queue = params['topic_name']
-        if six.PY2:
-            queue = queue.decode('utf-8', 'replace')
 
         LOG.debug(u'Invalid topic name "%(topic)s" submitted for '
                   u'project: %(project)s',

zaqar/common/urls.py

@@ -18,7 +18,6 @@ import hashlib
 import hmac
 
 from oslo_utils import timeutils
-import six
 
 _DATE_FORMAT = '%Y-%m-%dT%H:%M:%S'
 
@@ -78,12 +77,13 @@ def create_signed_url(key, paths, project=None, expires=None, methods=None):
     methods = sorted(methods)
     paths = sorted(paths)
     expires_str = expires.strftime(_DATE_FORMAT)
-    hmac_body = six.b(r'%(paths)s\n%(methods)s\n%(project)s\n%(expires)s' %
-                      {'paths': ','.join(paths), 'methods': ','.join(methods),
-                       'project': project, 'expires': expires_str})
+    hmac_body = (r'%(paths)s\n%(methods)s\n%(project)s\n%(expires)s' %
+                 {'paths': ','.join(paths), 'methods': ','.join(methods),
+                  'project': project, 'expires':
+                  expires_str}).encode('utf-8')
 
-    if not isinstance(key, six.binary_type):
-        key = six.binary_type(key.encode('utf-8'))
+    if not isinstance(key, bytes):
+        key = bytes(key.encode('utf-8'))
 
     return {'paths': paths,
             'methods': methods,

zaqar/common/utils.py

@@ -16,7 +16,6 @@
 """utils: general-purpose utilities."""
 
 from oslo_config import cfg
-import six
 
 
 def fields(d, names, pred=lambda x: True,
@@ -41,7 +40,6 @@ def fields(d, names, pred=lambda x: True,
 
 
 _pytype_to_cfgtype = {
-    six.text_type: cfg.StrOpt,
     str: cfg.StrOpt,
     int: cfg.IntOpt,
     bool: cfg.BoolOpt,

zaqar/notification/notifier.py

@@ -18,7 +18,7 @@ from stevedore import driver
 
 import futurist
 from oslo_log import log as logging
-from six.moves import urllib_parse
+from urllib import parse as urllib_parse
 
 from zaqar.common import auth
 from zaqar.common import urls

zaqar/notification/tasks/mailto.py

@@ -15,9 +15,9 @@
 
 from email.mime import text
 import json
-from six.moves import urllib_parse
 import smtplib
 import subprocess
+from urllib import parse as urllib_parse
 
 from oslo_log import log as logging