Skip to content
Navigation Menu
{{ message }}
forked from apache/cassandra-python-driver
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathencoder.py
More file actions
243 lines (211 loc) · 8.27 KB
/
Copy pathencoder.py
File metadata and controls
243 lines (211 loc) · 8.27 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
# Copyright DataStax, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
These functions are used to convert Python objects into CQL strings.
When non-prepared statements are executed, these encoder functions are
called on each query parameter.
"""
import logging
log = logging.getLogger(__name__)
from binascii import hexlify
import calendar
import datetime
import math
import sys
import types
from uuid import UUID
import six
if six.PY3:
import ipaddress
from cassandra.util import (OrderedDict, OrderedMap, OrderedMapSerializedKey,
sortedset, Time, Date)
if six.PY3:
long = int
def cql_quote(term):
# The ordering of this method is important for the result of this method to
# be a native str type (for both Python 2 and 3)
if isinstance(term, str):
return "'%s'" % str(term).replace("'", "''")
# This branch of the if statement will only be used by Python 2 to catch
# unicode strings, text_type is used to prevent type errors with Python 3.
elif isinstance(term, six.text_type):
return "'%s'" % term.encode('utf8').replace("'", "''")
else:
return str(term)
class ValueSequence(list):
pass
class Encoder(object):
"""
A container for mapping python types to CQL string literals when working
with non-prepared statements. The type :attr:`~.Encoder.mapping` can be
directly customized by users.
"""
mapping = None
"""
A map of python types to encoder functions.
"""
def __init__(self):
self.mapping = {
float: self.cql_encode_float,
bytearray: self.cql_encode_bytes,
str: self.cql_encode_str,
int: self.cql_encode_object,
UUID: self.cql_encode_object,
datetime.datetime: self.cql_encode_datetime,
datetime.date: self.cql_encode_date,
datetime.time: self.cql_encode_time,
Date: self.cql_encode_date_ext,
Time: self.cql_encode_time,
dict: self.cql_encode_map_collection,
OrderedDict: self.cql_encode_map_collection,
OrderedMap: self.cql_encode_map_collection,
OrderedMapSerializedKey: self.cql_encode_map_collection,
list: self.cql_encode_list_collection,
tuple: self.cql_encode_list_collection, # TODO: change to tuple in next major
set: self.cql_encode_set_collection,
sortedset: self.cql_encode_set_collection,
frozenset: self.cql_encode_set_collection,
types.GeneratorType: self.cql_encode_list_collection,
ValueSequence: self.cql_encode_sequence
}
if six.PY2:
self.mapping.update({
unicode: self.cql_encode_unicode,
buffer: self.cql_encode_bytes,
long: self.cql_encode_object,
types.NoneType: self.cql_encode_none,
})
else:
self.mapping.update({
memoryview: self.cql_encode_bytes,
bytes: self.cql_encode_bytes,
type(None): self.cql_encode_none,
ipaddress.IPv4Address: self.cql_encode_ipaddress,
ipaddress.IPv6Address: self.cql_encode_ipaddress
})
def cql_encode_none(self, val):
"""
Converts :const:`None` to the string 'NULL'.
"""
return 'NULL'
def cql_encode_unicode(self, val):
"""
Converts :class:`unicode` objects to UTF-8 encoded strings with quote escaping.
"""
return cql_quote(val.encode('utf-8'))
def cql_encode_str(self, val):
"""
Escapes quotes in :class:`str` objects.
"""
return cql_quote(val)
if six.PY3:
def cql_encode_bytes(self, val):
return (b'0x' + hexlify(val)).decode('utf-8')
elif sys.version_info >= (2, 7):
def cql_encode_bytes(self, val): # noqa
return b'0x' + hexlify(val)
else:
# python 2.6 requires string or read-only buffer for hexlify
def cql_encode_bytes(self, val): # noqa
return b'0x' + hexlify(buffer(val))
def cql_encode_object(self, val):
"""
Default encoder for all objects that do not have a specific encoder function
registered. This function simply calls :meth:`str()` on the object.
"""
return str(val)
def cql_encode_float(self, val):
"""
Encode floats using repr to preserve precision
"""
if math.isinf(val):
return 'Infinity' if val > 0 else '-Infinity'
elif math.isnan(val):
return 'NaN'
else:
return repr(val)
def cql_encode_datetime(self, val):
"""
Converts a :class:`datetime.datetime` object to a (string) integer timestamp
with millisecond precision.
"""
timestamp = calendar.timegm(val.utctimetuple())
return str(long(timestamp * 1e3 + getattr(val, 'microsecond', 0) / 1e3))
def cql_encode_date(self, val):
"""
Converts a :class:`datetime.date` object to a string with format
``YYYY-MM-DD``.
"""
return "'%s'" % val.strftime('%Y-%m-%d')
def cql_encode_time(self, val):
"""
Converts a :class:`cassandra.util.Time` object to a string with format
``HH:MM:SS.mmmuuunnn``.
"""
return "'%s'" % val
def cql_encode_date_ext(self, val):
"""
Encodes a :class:`cassandra.util.Date` object as an integer
"""
# using the int form in case the Date exceeds datetime.[MIN|MAX]YEAR
return str(val.days_from_epoch + 2 ** 31)
def cql_encode_sequence(self, val):
"""
Converts a sequence to a string of the form ``(item1, item2, ...)``. This
is suitable for ``IN`` value lists.
"""
return '(%s)' % ', '.join(self.mapping.get(type(v), self.cql_encode_object)(v)
for v in val)
cql_encode_tuple = cql_encode_sequence
"""
Converts a sequence to a string of the form ``(item1, item2, ...)``. This
is suitable for ``tuple`` type columns.
"""
def cql_encode_map_collection(self, val):
"""
Converts a dict into a string of the form ``{key1: val1, key2: val2, ...}``.
This is suitable for ``map`` type columns.
"""
return '{%s}' % ', '.join('%s: %s' % (
self.mapping.get(type(k), self.cql_encode_object)(k),
self.mapping.get(type(v), self.cql_encode_object)(v)
) for k, v in six.iteritems(val))
def cql_encode_list_collection(self, val):
"""
Converts a sequence to a string of the form ``[item1, item2, ...]``. This
is suitable for ``list`` type columns.
"""
return '[%s]' % ', '.join(self.mapping.get(type(v), self.cql_encode_object)(v) for v in val)
def cql_encode_set_collection(self, val):
"""
Converts a sequence to a string of the form ``{item1, item2, ...}``. This
is suitable for ``set`` type columns.
"""
return '{%s}' % ', '.join(self.mapping.get(type(v), self.cql_encode_object)(v) for v in val)
def cql_encode_all_types(self, val, as_text_type=False):
"""
Converts any type into a CQL string, defaulting to ``cql_encode_object``
if :attr:`~Encoder.mapping` does not contain an entry for the type.
"""
encoded = self.mapping.get(type(val), self.cql_encode_object)(val)
if as_text_type and not isinstance(encoded, six.text_type):
return encoded.decode('utf-8')
return encoded
if six.PY3:
def cql_encode_ipaddress(self, val):
"""
Converts an ipaddress (IPV4Address, IPV6Address) to a CQL string. This
is suitable for ``inet`` type columns.
"""
return "'%s'" % val.compressed
You can’t perform that action at this time.