Added FilterExpression to dynamodb scan
This commit is contained in:
Terry Cain
parent
c23c5057f2
commit
c86bece382
@ -1,4 +1,6 @@
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from __future__ import unicode_literals
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import re
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import six
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# TODO add tests for all of these
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EQ_FUNCTION = lambda item_value, test_value: item_value == test_value # flake8: noqa
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@ -39,3 +41,422 @@ COMPARISON_FUNCS = {
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def get_comparison_func(range_comparison):
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return COMPARISON_FUNCS.get(range_comparison)
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#
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def get_filter_expression(expr, names, values):
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# Examples
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# expr = 'Id > 5 AND attribute_exists(test) AND Id BETWEEN 5 AND 6 OR length < 6 AND contains(test, 1) AND 5 IN (4,5, 6) OR (Id < 5 AND 5 > Id)'
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# expr = 'Id > 5 AND Subs < 7'
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# Need to do some dodgyness for NOT i think.
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if 'NOT' in expr:
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raise NotImplementedError('NOT not supported yet')
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if names is None:
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names = {}
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if values is None:
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values = {}
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# Do substitutions
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for key, value in names.items():
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expr = expr.replace(key, value)
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for key, value in values.items():
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if 'N' in value:
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expr.replace(key, float(value['N']))
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else:
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expr = expr.replace(key, value['S'])
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# Remove all spaces, tbf we could just skip them in the next step.
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# The number of known options is really small so we can do a fair bit of cheating
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expr = list(re.sub('\s', '', expr)) # 'Id>5ANDattribute_exists(test)ORNOTlength<6'
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# DodgyTokenisation stage 1
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def is_value(val):
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return val not in ('<', '>', '=', '(', ')')
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def contains_keyword(val):
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for kw in ('BETWEEN', 'IN', 'AND', 'OR', 'NOT'):
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if kw in val:
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return kw
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return None
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def is_function(val):
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return val in ('attribute_exists', 'attribute_not_exists', 'attribute_type', 'begins_with', 'contains', 'size')
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# Does the main part of splitting between sections of characters
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tokens = []
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stack = ''
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while len(expr) > 0:
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current_char = expr.pop(0)
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if current_char == ',': # Split params ,
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if len(stack) > 0:
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tokens.append(stack)
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stack = ''
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elif is_value(current_char):
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stack += current_char
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kw = contains_keyword(stack)
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if kw is not None:
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# We have a kw in the stack, could be AND or something like 5AND
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tmp = stack.replace(kw, '')
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if len(tmp) > 0:
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tokens.append(tmp)
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tokens.append(kw)
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stack = ''
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else:
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if len(stack) > 0:
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tokens.append(stack)
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tokens.append(current_char)
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stack = ''
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if len(stack) > 0:
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tokens.append(stack)
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# DodgyTokenisation stage 2, it groups together some elements to make RPN'ing it later easier.
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tokens2 = []
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token_iterator = iter(tokens)
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for token in token_iterator:
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if token == '(':
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tuple_list = []
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next_token = six.next(token_iterator)
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while next_token != ')':
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tuple_list.append(next_token)
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next_token = six.next(token_iterator)
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tokens2.append(tuple(tuple_list))
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elif token == 'BETWEEN':
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op1 = six.next(token_iterator)
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and_op = six.next(token_iterator)
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assert and_op == 'AND'
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op2 = six.next(token_iterator)
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tokens2.append('BETWEEN')
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tokens2.append((op1, op2))
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elif is_function(token):
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function_list = [token]
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lbracket = six.next(token_iterator)
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assert lbracket == '('
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next_token = six.next(token_iterator)
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while next_token != ')':
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function_list.append(next_token)
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next_token = six.next(token_iterator)
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tokens2.append(function_list)
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else:
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try:
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token = int(token)
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except ValueError:
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try:
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token = float(token)
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except ValueError:
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pass
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tokens2.append(token)
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# Start of the Shunting-Yard algorigth. <-- Proper beast algorithm!
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def is_number(val):
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return val not in ('<', '>', '=', '>=', '<=', '<>', 'BETWEEN', 'IN', 'AND', 'OR', 'NOT')
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def is_op(val):
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return val in ('<', '>', '=', '>=', '<=', '<>', 'BETWEEN', 'IN', 'AND', 'OR', 'NOT')
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OPS = {'<': 5, '>': 5, '=': 5, '>=': 5, '<=': 5, '<>': 5, 'IN': 8, 'AND': 11, 'OR': 12, 'NOT': 10, 'BETWEEN': 9, '(': 1, ')': 1}
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output = []
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op_stack = []
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# Basically takes in an infix notation calculation, converts it to a reverse polish notation where there is no
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# ambiguaty on which order operators are applied.
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while len(tokens2) > 0:
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token = tokens2.pop(0)
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if token == '(':
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op_stack.append(token)
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elif token == ')':
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while len(op_stack) > 0 and op_stack[-1] != '(':
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output.append(op_stack.pop())
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if len(op_stack) == 0:
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# No left paren on the stack, error
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raise Exception('Missing left paren')
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# Pop off the left paren
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op_stack.pop()
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elif is_number(token):
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output.append(token)
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else:
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# Must be operator kw
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while len(op_stack) > 0 and OPS[op_stack[-1]] <= OPS[token]:
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output.append(op_stack.pop())
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op_stack.append(token)
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while len(op_stack) > 0:
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output.append(op_stack.pop())
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# Hacky funcition to convert dynamo functions (which are represented as lists) to their Class equivelent
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def to_func(val):
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if isinstance(val, list):
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func_name = val.pop(0)
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# Expand rest of the list to arguments
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val = FUNC_CLASS[func_name](*val)
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return val
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# Simple reverse polish notation execution. Builts up a nested filter object.
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# The filter object then takes a dynamo item and returns true/false
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stack = []
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for token in output:
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if is_op(token):
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op2 = stack.pop()
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op1 = stack.pop()
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op_cls = OP_CLASS[token]
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stack.append(op_cls(op1, op2))
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else:
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stack.append(to_func(token))
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return stack[0]
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class Op(object):
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"""
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Base class for a FilterExpression operator
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"""
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OP = ''
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def __init__(self, lhs, rhs):
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self.lhs = lhs
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self.rhs = rhs
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def _lhs(self, item):
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"""
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:type item: moto.dynamodb2.models.Item
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"""
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lhs = self.lhs
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if isinstance(self.lhs, (Op, Func)):
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lhs = self.lhs.expr(item)
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elif isinstance(self.lhs, str):
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try:
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lhs = item.attrs[self.lhs].cast_value
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except Exception:
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pass
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return lhs
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def _rhs(self, item):
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rhs = self.rhs
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if isinstance(self.rhs, (Op, Func)):
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rhs = self.rhs.expr(item)
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elif isinstance(self.lhs, str):
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try:
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rhs = item.attrs[self.rhs].cast_value
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except Exception:
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pass
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return rhs
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def expr(self, item):
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return True
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def __repr__(self):
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return '({0} {1} {2})'.format(self.lhs, self.OP, self.rhs)
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class Func(object):
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"""
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Base class for a FilterExpression function
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"""
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FUNC = 'Unknown'
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def expr(self, item):
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return True
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def __repr__(self):
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return 'Func(...)'.format(self.FUNC)
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class OpAnd(Op):
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OP = 'AND'
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def expr(self, item):
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lhs = self._lhs(item)
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rhs = self._rhs(item)
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return lhs and rhs
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class OpLessThan(Op):
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OP = '<'
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def expr(self, item):
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lhs = self._lhs(item)
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rhs = self._rhs(item)
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return lhs < rhs
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class OpGreaterThan(Op):
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OP = '>'
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def expr(self, item):
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lhs = self._lhs(item)
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rhs = self._rhs(item)
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return lhs > rhs
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class OpEqual(Op):
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OP = '='
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def expr(self, item):
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lhs = self._lhs(item)
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rhs = self._rhs(item)
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return lhs == rhs
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class OpNotEqual(Op):
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OP = '<>'
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def expr(self, item):
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lhs = self._lhs(item)
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rhs = self._rhs(item)
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return lhs == rhs
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class OpLessThanOrEqual(Op):
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OP = '<='
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def expr(self, item):
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lhs = self._lhs(item)
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rhs = self._rhs(item)
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return lhs <= rhs
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class OpGreaterThanOrEqual(Op):
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OP = '>='
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def expr(self, item):
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lhs = self._lhs(item)
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rhs = self._rhs(item)
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return lhs >= rhs
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class OpOr(Op):
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OP = 'OR'
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def expr(self, item):
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lhs = self._lhs(item)
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rhs = self._rhs(item)
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return lhs or rhs
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class OpIn(Op):
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OP = 'IN'
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def expr(self, item):
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lhs = self._lhs(item)
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rhs = self._rhs(item)
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return lhs in rhs
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class OpBetween(Op):
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OP = 'BETWEEN'
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def expr(self, item):
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lhs = self._lhs(item)
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rhs = self._rhs(item)
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return rhs[0] <= lhs <= rhs[1]
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class FuncAttrExists(Func):
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FUNC = 'attribute_exists'
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def __init__(self, attribute):
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self.attr = attribute
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def expr(self, item):
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return self.attr in item.attrs
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class FuncAttrNotExists(Func):
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FUNC = 'attribute_not_exists'
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def __init__(self, attribute):
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self.attr = attribute
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def expr(self, item):
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return self.attr not in item.attrs
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class FuncAttrType(Func):
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FUNC = 'attribute_type'
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def __init__(self, attribute, _type):
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self.attr = attribute
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self.type = _type
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def expr(self, item):
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return self.attr in item.attrs and item.attrs[self.attr].type == self.type
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class FuncBeginsWith(Func):
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FUNC = 'begins_with'
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def __init__(self, attribute, substr):
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self.attr = attribute
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self.substr = substr
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def expr(self, item):
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return self.attr in item.attrs and item.attrs[self.attr].type == 'S' and item.attrs[self.attr].value.startswith(self.substr)
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class FuncContains(Func):
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FUNC = 'contains'
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def __init__(self, attribute, operand):
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self.attr = attribute
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self.operand = operand
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def expr(self, item):
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if self.attr not in item.attrs:
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return False
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if item.attrs[self.attr].type in ('S', 'SS', 'NS', 'BS', 'L', 'M'):
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return self.operand in item.attrs[self.attr].value
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return False
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class FuncSize(Func):
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FUNC = 'contains'
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def __init__(self, attribute):
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self.attr = attribute
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def expr(self, item):
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if self.attr not in item.attrs:
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raise ValueError('Invalid option')
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if item.attrs[self.attr].type in ('S', 'SS', 'NS', 'B', 'BS', 'L', 'M'):
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return len(item.attrs[self.attr].value)
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raise ValueError('Invalid option')
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OP_CLASS = {
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'AND': OpAnd,
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'OR': OpOr,
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'IN': OpIn,
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'BETWEEN': OpBetween,
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'<': OpLessThan,
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'>': OpGreaterThan,
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'<=': OpLessThanOrEqual,
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'>=': OpGreaterThanOrEqual,
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'=': OpEqual,
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'<>': OpNotEqual
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}
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FUNC_CLASS = {
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'attribute_exists': FuncAttrExists,
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'attribute_not_exists': FuncAttrNotExists,
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'attribute_type': FuncAttrType,
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'begins_with': FuncBeginsWith,
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'contains': FuncContains,
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'size': FuncSize
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}
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@ -8,7 +8,7 @@ import re
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from moto.compat import OrderedDict
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from moto.core import BaseBackend, BaseModel
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from moto.core.utils import unix_time
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from .comparisons import get_comparison_func
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from .comparisons import get_comparison_func, get_filter_expression, Op
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class DynamoJsonEncoder(json.JSONEncoder):
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@ -508,15 +508,15 @@ class Table(BaseModel):
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else:
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yield hash_set
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def scan(self, filters, limit, exclusive_start_key):
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def scan(self, filters, limit, exclusive_start_key, filter_expression=None):
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results = []
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scanned_count = 0
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for result in self.all_items():
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for item in self.all_items():
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scanned_count += 1
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passes_all_conditions = True
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for attribute_name, (comparison_operator, comparison_objs) in filters.items():
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attribute = result.attrs.get(attribute_name)
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attribute = item.attrs.get(attribute_name)
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if attribute:
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# Attribute found
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@ -532,8 +532,11 @@ class Table(BaseModel):
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passes_all_conditions = False
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break
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if filter_expression is not None:
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passes_all_conditions &= filter_expression.expr(item)
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if passes_all_conditions:
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results.append(result)
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results.append(item)
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results, last_evaluated_key = self._trim_results(results, limit,
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exclusive_start_key)
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@ -698,7 +701,7 @@ class DynamoDBBackend(BaseBackend):
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return table.query(hash_key, range_comparison, range_values, limit,
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exclusive_start_key, scan_index_forward, projection_expression, index_name, **filter_kwargs)
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def scan(self, table_name, filters, limit, exclusive_start_key):
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def scan(self, table_name, filters, limit, exclusive_start_key, filter_expression, expr_names, expr_values):
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table = self.tables.get(table_name)
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if not table:
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return None, None, None
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@ -708,7 +711,12 @@ class DynamoDBBackend(BaseBackend):
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dynamo_types = [DynamoType(value) for value in comparison_values]
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scan_filters[key] = (comparison_operator, dynamo_types)
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return table.scan(scan_filters, limit, exclusive_start_key)
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if filter_expression is not None:
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filter_expression = get_filter_expression(filter_expression, expr_names, expr_values)
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else:
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filter_expression = Op(None, None) # Will always eval to true
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return table.scan(scan_filters, limit, exclusive_start_key, filter_expression)
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def update_item(self, table_name, key, update_expression, attribute_updates, expression_attribute_names,
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expression_attribute_values, expected=None):
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@ -432,12 +432,19 @@ class DynamoHandler(BaseResponse):
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comparison_values = scan_filter.get("AttributeValueList", [])
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filters[attribute_name] = (comparison_operator, comparison_values)
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filter_expression = self.body.get('FilterExpression')
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expression_attribute_values = self.body.get('ExpressionAttributeValues', {})
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expression_attribute_names = self.body.get('ExpressionAttributeNames', {})
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exclusive_start_key = self.body.get('ExclusiveStartKey')
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limit = self.body.get("Limit")
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items, scanned_count, last_evaluated_key = dynamodb_backend2.scan(name, filters,
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limit,
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exclusive_start_key)
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exclusive_start_key,
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filter_expression,
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expression_attribute_names,
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expression_attribute_values)
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if items is None:
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er = 'com.amazonaws.dynamodb.v20111205#ResourceNotFoundException'
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@ -3,6 +3,7 @@ from __future__ import unicode_literals, print_function
|
||||
import six
|
||||
import boto
|
||||
import boto3
|
||||
from boto3.dynamodb.conditions import Attr
|
||||
import sure # noqa
|
||||
import requests
|
||||
from moto import mock_dynamodb2, mock_dynamodb2_deprecated
|
||||
@ -12,6 +13,10 @@ from botocore.exceptions import ClientError
|
||||
from boto3.dynamodb.conditions import Key
|
||||
from tests.helpers import requires_boto_gte
|
||||
import tests.backport_assert_raises
|
||||
|
||||
import moto.dynamodb2.comparisons
|
||||
import moto.dynamodb2.models
|
||||
|
||||
from nose.tools import assert_raises
|
||||
try:
|
||||
import boto.dynamodb2
|
||||
@ -230,6 +235,7 @@ def test_scan_returns_consumed_capacity():
|
||||
assert 'CapacityUnits' in response['ConsumedCapacity']
|
||||
assert response['ConsumedCapacity']['TableName'] == name
|
||||
|
||||
|
||||
@requires_boto_gte("2.9")
|
||||
@mock_dynamodb2
|
||||
def test_query_returns_consumed_capacity():
|
||||
@ -280,6 +286,7 @@ def test_query_returns_consumed_capacity():
|
||||
assert 'CapacityUnits' in results['ConsumedCapacity']
|
||||
assert results['ConsumedCapacity']['CapacityUnits'] == 1
|
||||
|
||||
|
||||
@mock_dynamodb2
|
||||
def test_basic_projection_expressions():
|
||||
dynamodb = boto3.resource('dynamodb', region_name='us-east-1')
|
||||
@ -353,6 +360,7 @@ def test_basic_projection_expressions():
|
||||
assert 'body' in results['Items'][1]
|
||||
assert results['Items'][1]['body'] == 'yet another test message'
|
||||
|
||||
|
||||
@mock_dynamodb2
|
||||
def test_basic_projection_expressions_with_attr_expression_names():
|
||||
dynamodb = boto3.resource('dynamodb', region_name='us-east-1')
|
||||
@ -419,6 +427,7 @@ def test_basic_projection_expressions_with_attr_expression_names():
|
||||
assert 'attachment' in results['Items'][0]
|
||||
assert results['Items'][0]['attachment'] == 'something'
|
||||
|
||||
|
||||
@mock_dynamodb2
|
||||
def test_put_item_returns_consumed_capacity():
|
||||
dynamodb = boto3.resource('dynamodb', region_name='us-east-1')
|
||||
@ -461,6 +470,7 @@ def test_put_item_returns_consumed_capacity():
|
||||
|
||||
assert 'ConsumedCapacity' in response
|
||||
|
||||
|
||||
@mock_dynamodb2
|
||||
def test_update_item_returns_consumed_capacity():
|
||||
dynamodb = boto3.resource('dynamodb', region_name='us-east-1')
|
||||
@ -514,6 +524,7 @@ def test_update_item_returns_consumed_capacity():
|
||||
assert 'CapacityUnits' in response['ConsumedCapacity']
|
||||
assert 'TableName' in response['ConsumedCapacity']
|
||||
|
||||
|
||||
@mock_dynamodb2
|
||||
def test_get_item_returns_consumed_capacity():
|
||||
dynamodb = boto3.resource('dynamodb', region_name='us-east-1')
|
||||
@ -562,3 +573,61 @@ def test_get_item_returns_consumed_capacity():
|
||||
assert 'ConsumedCapacity' in response
|
||||
assert 'CapacityUnits' in response['ConsumedCapacity']
|
||||
assert 'TableName' in response['ConsumedCapacity']
|
||||
|
||||
|
||||
def test_filter_expression():
|
||||
row1 = moto.dynamodb2.models.Item(None, None, None, None, {'Id': {'N': '8'}, 'Subs': {'N': '5'}, 'Desc': {'S': 'Some description'}, 'KV': {'SS': ['test1', 'test2']}})
|
||||
row2 = moto.dynamodb2.models.Item(None, None, None, None, {'Id': {'N': '8'}, 'Subs': {'N': '10'}, 'Desc': {'S': 'A description'}, 'KV': {'SS': ['test3', 'test4']}})
|
||||
|
||||
filter1 = moto.dynamodb2.comparisons.get_filter_expression('Id > 5 AND Subs < 7', {}, {})
|
||||
filter1.expr(row1).should.be(True)
|
||||
filter1.expr(row2).should.be(False)
|
||||
|
||||
filter2 = moto.dynamodb2.comparisons.get_filter_expression('attribute_exists(Id) AND attribute_not_exists(User)', {}, {})
|
||||
filter2.expr(row1).should.be(True)
|
||||
|
||||
filter3 = moto.dynamodb2.comparisons.get_filter_expression('attribute_type(Id, N)', {}, {})
|
||||
filter3.expr(row1).should.be(True)
|
||||
|
||||
filter4 = moto.dynamodb2.comparisons.get_filter_expression('begins_with(Desc, Some)', {}, {})
|
||||
filter4.expr(row1).should.be(True)
|
||||
filter4.expr(row2).should.be(False)
|
||||
|
||||
filter5 = moto.dynamodb2.comparisons.get_filter_expression('contains(KV, test1)', {}, {})
|
||||
filter5.expr(row1).should.be(True)
|
||||
filter5.expr(row2).should.be(False)
|
||||
|
||||
filter6 = moto.dynamodb2.comparisons.get_filter_expression('size(Desc) > size(KV)', {}, {})
|
||||
filter6.expr(row1).should.be(True)
|
||||
|
||||
|
||||
@mock_dynamodb2
|
||||
def test_scan_filter():
|
||||
client = boto3.client('dynamodb', region_name='us-east-1')
|
||||
dynamodb = boto3.resource('dynamodb', region_name='us-east-1')
|
||||
|
||||
# Create the DynamoDB table.
|
||||
client.create_table(
|
||||
TableName='test1',
|
||||
AttributeDefinitions=[{'AttributeName': 'client', 'AttributeType': 'S'}, {'AttributeName': 'app', 'AttributeType': 'S'}],
|
||||
KeySchema=[{'AttributeName': 'client', 'KeyType': 'HASH'}, {'AttributeName': 'app', 'KeyType': 'RANGE'}],
|
||||
ProvisionedThroughput={'ReadCapacityUnits': 123, 'WriteCapacityUnits': 123}
|
||||
)
|
||||
client.put_item(
|
||||
TableName='test1',
|
||||
Item={
|
||||
'client': {'S': 'client1'},
|
||||
'app': {'S': 'app1'}
|
||||
}
|
||||
)
|
||||
|
||||
table = dynamodb.Table('test1')
|
||||
response = table.scan(
|
||||
FilterExpression=Attr('app').eq('app2')
|
||||
)
|
||||
assert response['Count'] == 0
|
||||
|
||||
response = table.scan(
|
||||
FilterExpression=Attr('app').eq('app1')
|
||||
)
|
||||
assert response['Count'] == 1
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user