228 lines
7.7 KiB
Python
228 lines
7.7 KiB
Python
# Copyright 2013-2017 DataStax, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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These functions are used to convert Python objects into CQL strings.
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When non-prepared statements are executed, these encoder functions are
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called on each query parameter.
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"""
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import logging
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log = logging.getLogger(__name__)
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from binascii import hexlify
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import calendar
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import datetime
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import math
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import sys
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import types
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from uuid import UUID
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import six
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from cassandra.util import (OrderedDict, OrderedMap, OrderedMapSerializedKey,
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sortedset, Time, Date)
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if six.PY3:
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long = int
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def cql_quote(term):
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# The ordering of this method is important for the result of this method to
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# be a native str type (for both Python 2 and 3)
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if isinstance(term, str):
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return "'%s'" % str(term).replace("'", "''")
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# This branch of the if statement will only be used by Python 2 to catch
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# unicode strings, text_type is used to prevent type errors with Python 3.
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elif isinstance(term, six.text_type):
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return "'%s'" % term.encode('utf8').replace("'", "''")
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else:
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return str(term)
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class ValueSequence(list):
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pass
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class Encoder(object):
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"""
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A container for mapping python types to CQL string literals when working
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with non-prepared statements. The type :attr:`~.Encoder.mapping` can be
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directly customized by users.
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"""
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mapping = None
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"""
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A map of python types to encoder functions.
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"""
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def __init__(self):
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self.mapping = {
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float: self.cql_encode_float,
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bytearray: self.cql_encode_bytes,
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str: self.cql_encode_str,
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int: self.cql_encode_object,
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UUID: self.cql_encode_object,
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datetime.datetime: self.cql_encode_datetime,
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datetime.date: self.cql_encode_date,
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datetime.time: self.cql_encode_time,
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Date: self.cql_encode_date_ext,
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Time: self.cql_encode_time,
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dict: self.cql_encode_map_collection,
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OrderedDict: self.cql_encode_map_collection,
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OrderedMap: self.cql_encode_map_collection,
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OrderedMapSerializedKey: self.cql_encode_map_collection,
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list: self.cql_encode_list_collection,
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tuple: self.cql_encode_list_collection, # TODO: change to tuple in next major
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set: self.cql_encode_set_collection,
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sortedset: self.cql_encode_set_collection,
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frozenset: self.cql_encode_set_collection,
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types.GeneratorType: self.cql_encode_list_collection,
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ValueSequence: self.cql_encode_sequence
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}
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if six.PY2:
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self.mapping.update({
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unicode: self.cql_encode_unicode,
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buffer: self.cql_encode_bytes,
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long: self.cql_encode_object,
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types.NoneType: self.cql_encode_none,
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})
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else:
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self.mapping.update({
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memoryview: self.cql_encode_bytes,
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bytes: self.cql_encode_bytes,
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type(None): self.cql_encode_none,
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})
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def cql_encode_none(self, val):
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"""
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Converts :const:`None` to the string 'NULL'.
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"""
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return 'NULL'
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def cql_encode_unicode(self, val):
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"""
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Converts :class:`unicode` objects to UTF-8 encoded strings with quote escaping.
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"""
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return cql_quote(val.encode('utf-8'))
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def cql_encode_str(self, val):
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"""
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Escapes quotes in :class:`str` objects.
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"""
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return cql_quote(val)
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if six.PY3:
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def cql_encode_bytes(self, val):
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return (b'0x' + hexlify(val)).decode('utf-8')
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elif sys.version_info >= (2, 7):
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def cql_encode_bytes(self, val): # noqa
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return b'0x' + hexlify(val)
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else:
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# python 2.6 requires string or read-only buffer for hexlify
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def cql_encode_bytes(self, val): # noqa
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return b'0x' + hexlify(buffer(val))
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def cql_encode_object(self, val):
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"""
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Default encoder for all objects that do not have a specific encoder function
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registered. This function simply calls :meth:`str()` on the object.
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"""
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return str(val)
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def cql_encode_float(self, val):
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"""
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Encode floats using repr to preserve precision
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"""
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if math.isinf(val):
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return 'Infinity' if val > 0 else '-Infinity'
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elif math.isnan(val):
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return 'NaN'
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else:
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return repr(val)
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def cql_encode_datetime(self, val):
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"""
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Converts a :class:`datetime.datetime` object to a (string) integer timestamp
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with millisecond precision.
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"""
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timestamp = calendar.timegm(val.utctimetuple())
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return str(long(timestamp * 1e3 + getattr(val, 'microsecond', 0) / 1e3))
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def cql_encode_date(self, val):
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"""
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Converts a :class:`datetime.date` object to a string with format
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``YYYY-MM-DD``.
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"""
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return "'%s'" % val.strftime('%Y-%m-%d')
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def cql_encode_time(self, val):
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"""
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Converts a :class:`cassandra.util.Time` object to a string with format
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``HH:MM:SS.mmmuuunnn``.
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"""
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return "'%s'" % val
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def cql_encode_date_ext(self, val):
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"""
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Encodes a :class:`cassandra.util.Date` object as an integer
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"""
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# using the int form in case the Date exceeds datetime.[MIN|MAX]YEAR
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return str(val.days_from_epoch + 2 ** 31)
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def cql_encode_sequence(self, val):
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"""
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Converts a sequence to a string of the form ``(item1, item2, ...)``. This
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is suitable for ``IN`` value lists.
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"""
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return '(%s)' % ', '.join(self.mapping.get(type(v), self.cql_encode_object)(v)
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for v in val)
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cql_encode_tuple = cql_encode_sequence
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"""
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Converts a sequence to a string of the form ``(item1, item2, ...)``. This
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is suitable for ``tuple`` type columns.
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"""
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def cql_encode_map_collection(self, val):
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"""
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Converts a dict into a string of the form ``{key1: val1, key2: val2, ...}``.
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This is suitable for ``map`` type columns.
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"""
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return '{%s}' % ', '.join('%s: %s' % (
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self.mapping.get(type(k), self.cql_encode_object)(k),
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self.mapping.get(type(v), self.cql_encode_object)(v)
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) for k, v in six.iteritems(val))
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def cql_encode_list_collection(self, val):
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"""
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Converts a sequence to a string of the form ``[item1, item2, ...]``. This
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is suitable for ``list`` type columns.
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"""
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return '[%s]' % ', '.join(self.mapping.get(type(v), self.cql_encode_object)(v) for v in val)
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def cql_encode_set_collection(self, val):
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"""
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Converts a sequence to a string of the form ``{item1, item2, ...}``. This
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is suitable for ``set`` type columns.
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"""
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return '{%s}' % ', '.join(self.mapping.get(type(v), self.cql_encode_object)(v) for v in val)
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def cql_encode_all_types(self, val):
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"""
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Converts any type into a CQL string, defaulting to ``cql_encode_object``
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if :attr:`~Encoder.mapping` does not contain an entry for the type.
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"""
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return self.mapping.get(type(val), self.cql_encode_object)(val)
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