Fixed #22714 -- Made contrib.gis use six-provided memoryview type

Thanks Tim Graham for the report.

django/contrib/gis/__init__.py

@@ -1,9 +1 @@
-from django.utils import six
-
-if six.PY3:
-    memoryview = memoryview
-else:
-    memoryview = buffer
-
-
 default_app_config = 'django.contrib.gis.apps.GISConfig'

django/contrib/gis/db/models/proxy.py

@@ -5,7 +5,6 @@ corresponding to geographic model fields.
 
 Thanks to Robert Coup for providing this functionality (see #4322).
 """
-from django.contrib.gis import memoryview
 from django.utils import six
 
 
@@ -57,7 +56,7 @@ class GeometryProxy(object):
             # Assigning the SRID to the geometry.
             if value.srid is None:
                 value.srid = self._field.srid
-        elif value is None or isinstance(value, six.string_types + (memoryview,)):
+        elif value is None or isinstance(value, six.string_types + (six.memoryview,)):
             # Set with None, WKT, HEX, or WKB
             pass
         else:

django/contrib/gis/db/models/query.py

@@ -1,7 +1,6 @@
 from django.db import connections
 from django.db.models.query import QuerySet, ValuesQuerySet, ValuesListQuerySet
 
-from django.contrib.gis import memoryview
 from django.contrib.gis.db.models import aggregates
 from django.contrib.gis.db.models.fields import get_srid_info, PointField, LineStringField
 from django.contrib.gis.db.models.sql import AreaField, DistanceField, GeomField, GeoQuery
@@ -690,7 +689,7 @@ class GeoQuerySet(QuerySet):
                     if not backend.geography:
                         if not isinstance(geo_field, PointField):
                             raise ValueError('Spherical distance calculation only supported on PointFields.')
-                        if not str(Geometry(memoryview(params[0].ewkb)).geom_type) == 'Point':
+                        if not str(Geometry(six.memoryview(params[0].ewkb)).geom_type) == 'Point':
                             raise ValueError('Spherical distance calculation only supported with Point Geometry parameters')
                     # The `function` procedure argument needs to be set differently for
                     # geodetic distance calculations.

django/contrib/gis/gdal/geometries.py

@@ -43,8 +43,6 @@ import sys
 from binascii import a2b_hex, b2a_hex
 from ctypes import byref, string_at, c_char_p, c_double, c_ubyte, c_void_p
 
-from django.contrib.gis import memoryview
-
 # Getting GDAL prerequisites
 from django.contrib.gis.gdal.base import GDALBase
 from django.contrib.gis.gdal.envelope import Envelope, OGREnvelope
@@ -77,7 +75,7 @@ class OGRGeometry(GDALBase):
 
         # If HEX, unpack input to a binary buffer.
         if str_instance and hex_regex.match(geom_input):
-            geom_input = memoryview(a2b_hex(geom_input.upper().encode()))
+            geom_input = six.memoryview(a2b_hex(geom_input.upper().encode()))
             str_instance = False
 
         # Constructing the geometry,
@@ -102,7 +100,7 @@ class OGRGeometry(GDALBase):
                 # (e.g., 'Point', 'POLYGON').
                 OGRGeomType(geom_input)
                 g = capi.create_geom(OGRGeomType(geom_input).num)
-        elif isinstance(geom_input, memoryview):
+        elif isinstance(geom_input, six.memoryview):
             # WKB was passed in
             g = capi.from_wkb(bytes(geom_input), None, byref(c_void_p()), len(geom_input))
         elif isinstance(geom_input, OGRGeomType):
@@ -346,7 +344,7 @@ class OGRGeometry(GDALBase):
         buf = (c_ubyte * sz)()
         capi.to_wkb(self.ptr, byteorder, byref(buf))
         # Returning a buffer of the string at the pointer.
-        return memoryview(string_at(buf, sz))
+        return six.memoryview(string_at(buf, sz))
 
     @property
     def wkt(self):

django/contrib/gis/geos/factory.py

@@ -1,4 +1,3 @@
-from django.contrib.gis import memoryview
 from django.contrib.gis.geos.geometry import GEOSGeometry, wkt_regex, hex_regex
 
 from django.utils import six
@@ -27,7 +26,7 @@ def fromfile(file_h):
     else:
         return GEOSGeometry(buf)
 
-    return GEOSGeometry(memoryview(buf))
+    return GEOSGeometry(six.memoryview(buf))
 
 
 def fromstr(string, **kwargs):

django/contrib/gis/geos/geometry.py

@@ -7,7 +7,6 @@ from __future__ import unicode_literals
 # Python, ctypes and types dependencies.
 from ctypes import addressof, byref, c_double
 
-from django.contrib.gis import memoryview
 # super-class for mutable list behavior
 from django.contrib.gis.geos.mutable_list import ListMixin
 
@@ -80,7 +79,7 @@ class GEOSGeometry(GEOSBase, ListMixin):
         elif isinstance(geo_input, GEOM_PTR):
             # When the input is a pointer to a geometry (GEOM_PTR).
             g = geo_input
-        elif isinstance(geo_input, memoryview):
+        elif isinstance(geo_input, six.memoryview):
             # When the input is a buffer (WKB).
             g = wkb_r().read(geo_input)
         elif isinstance(geo_input, GEOSGeometry):
@@ -151,7 +150,7 @@ class GEOSGeometry(GEOSBase, ListMixin):
     def __setstate__(self, state):
         # Instantiating from the tuple state that was pickled.
         wkb, srid = state
-        ptr = wkb_r().read(memoryview(wkb))
+        ptr = wkb_r().read(six.memoryview(wkb))
         if not ptr:
             raise GEOSException('Invalid Geometry loaded from pickled state.')
         self.ptr = ptr

django/contrib/gis/geos/prototypes/io.py

@@ -1,6 +1,5 @@
 import threading
 from ctypes import byref, c_char_p, c_int, c_char, c_size_t, Structure, POINTER
-from django.contrib.gis import memoryview
 from django.contrib.gis.geos.base import GEOSBase
 from django.contrib.gis.geos.libgeos import GEOM_PTR
 from django.contrib.gis.geos.prototypes.errcheck import check_geom, check_string, check_sized_string
@@ -164,7 +163,7 @@ class _WKBReader(IOBase):
 
     def read(self, wkb):
         "Returns a _pointer_ to C GEOS Geometry object from the given WKB."
-        if isinstance(wkb, memoryview):
+        if isinstance(wkb, six.memoryview):
             wkb_s = bytes(wkb)
             return wkb_reader_read(self.ptr, wkb_s, len(wkb_s))
         elif isinstance(wkb, (bytes, six.string_types)):
@@ -201,7 +200,7 @@ class WKBWriter(IOBase):
 
     def write(self, geom):
         "Returns the WKB representation of the given geometry."
-        return memoryview(wkb_writer_write(self.ptr, geom.ptr, byref(c_size_t())))
+        return six.memoryview(wkb_writer_write(self.ptr, geom.ptr, byref(c_size_t())))
 
     def write_hex(self, geom):
         "Returns the HEXEWKB representation of the given geometry."

django/contrib/gis/geos/tests/test_geos.py

@@ -10,7 +10,6 @@ from io import BytesIO
 
 from django.contrib.gis.gdal import HAS_GDAL
 
-from django.contrib.gis import memoryview
 from django.contrib.gis.geometry.test_data import TestDataMixin
 
 from django.utils.encoding import force_bytes
@@ -110,8 +109,8 @@ class GEOSTest(unittest.TestCase, TestDataMixin):
         self.assertEqual(True, GEOSGeometry(hexewkb_3d).hasz)
 
         # Same for EWKB.
-        self.assertEqual(memoryview(a2b_hex(hexewkb_2d)), pnt_2d.ewkb)
+        self.assertEqual(six.memoryview(a2b_hex(hexewkb_2d)), pnt_2d.ewkb)
-        self.assertEqual(memoryview(a2b_hex(hexewkb_3d)), pnt_3d.ewkb)
+        self.assertEqual(six.memoryview(a2b_hex(hexewkb_3d)), pnt_3d.ewkb)
 
         # Redundant sanity check.
         self.assertEqual(4326, GEOSGeometry(hexewkb_2d).srid)
@@ -132,7 +131,7 @@ class GEOSTest(unittest.TestCase, TestDataMixin):
                 fromstr(err.wkt)
 
         # Bad WKB
-        self.assertRaises(GEOSException, GEOSGeometry, memoryview(b'0'))
+        self.assertRaises(GEOSException, GEOSGeometry, six.memoryview(b'0'))
 
         class NotAGeometry(object):
             pass
@@ -160,7 +159,7 @@ class GEOSTest(unittest.TestCase, TestDataMixin):
     def test_create_wkb(self):
         "Testing creation from WKB."
         for g in self.geometries.hex_wkt:
-            wkb = memoryview(a2b_hex(g.hex.encode()))
+            wkb = six.memoryview(a2b_hex(g.hex.encode()))
             geom_h = GEOSGeometry(wkb)
             # we need to do this so decimal places get normalized
             geom_t = fromstr(g.wkt)

django/contrib/gis/geos/tests/test_io.py

@@ -4,7 +4,7 @@ import binascii
 import unittest
 from unittest import skipUnless
 
-from django.contrib.gis import memoryview
+from django.utils.six import memoryview
 
 from ..import HAS_GEOS