316 lines
9.7 KiB
Python
316 lines
9.7 KiB
Python
from collections import defaultdict
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import datetime
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import json
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try:
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from collections import OrderedDict
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except ImportError:
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# python 2.6 or earlier, use backport
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from ordereddict import OrderedDict
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from moto.core import BaseBackend
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from .comparisons import get_comparison_func
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from .utils import unix_time
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class DynamoJsonEncoder(json.JSONEncoder):
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def default(self, obj):
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if hasattr(obj, 'to_json'):
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return obj.to_json()
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def dynamo_json_dump(dynamo_object):
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return json.dumps(dynamo_object, cls=DynamoJsonEncoder)
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class DynamoType(object):
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"""
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http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DataModel.html#DataModelDataTypes
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"""
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def __init__(self, type_as_dict):
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self.type = type_as_dict.keys()[0]
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self.value = type_as_dict.values()[0]
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def __hash__(self):
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return hash((self.type, self.value))
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def __eq__(self, other):
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return (
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self.type == other.type and
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self.value == other.value
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)
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def __repr__(self):
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return "DynamoType: {0}".format(self.to_json())
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def to_json(self):
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return {self.type: self.value}
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def compare(self, range_comparison, range_objs):
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"""
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Compares this type against comparison filters
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"""
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range_values = [obj.value for obj in range_objs]
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comparison_func = get_comparison_func(range_comparison)
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return comparison_func(self.value, *range_values)
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class Item(object):
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def __init__(self, hash_key, hash_key_type, range_key, range_key_type, attrs):
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self.hash_key = hash_key
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self.hash_key_type = hash_key_type
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self.range_key = range_key
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self.range_key_type = range_key_type
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self.attrs = {}
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for key, value in attrs.iteritems():
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self.attrs[key] = DynamoType(value)
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def __repr__(self):
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return "Item: {0}".format(self.to_json())
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def to_json(self):
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attributes = {}
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for attribute_key, attribute in self.attrs.iteritems():
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attributes[attribute_key] = attribute.value
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return {
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"Attributes": attributes
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}
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def describe_attrs(self, attributes):
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if attributes:
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included = {}
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for key, value in self.attrs.iteritems():
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if key in attributes:
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included[key] = value
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else:
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included = self.attrs
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return {
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"Item": included
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}
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class Table(object):
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def __init__(self, name, hash_key_attr, hash_key_type,
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range_key_attr=None, range_key_type=None, read_capacity=None,
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write_capacity=None):
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self.name = name
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self.hash_key_attr = hash_key_attr
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self.hash_key_type = hash_key_type
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self.range_key_attr = range_key_attr
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self.range_key_type = range_key_type
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self.read_capacity = read_capacity
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self.write_capacity = write_capacity
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self.created_at = datetime.datetime.now()
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self.items = defaultdict(dict)
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@property
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def has_range_key(self):
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return self.range_key_attr is not None
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@property
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def describe(self):
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results = {
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"Table": {
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"CreationDateTime": unix_time(self.created_at),
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"KeySchema": {
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"HashKeyElement": {
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"AttributeName": self.hash_key_attr,
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"AttributeType": self.hash_key_type
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},
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},
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"ProvisionedThroughput": {
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"ReadCapacityUnits": self.read_capacity,
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"WriteCapacityUnits": self.write_capacity
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},
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"TableName": self.name,
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"TableStatus": "ACTIVE",
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"ItemCount": len(self),
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"TableSizeBytes": 0,
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}
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}
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if self.has_range_key:
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results["Table"]["KeySchema"]["RangeKeyElement"] = {
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"AttributeName": self.range_key_attr,
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"AttributeType": self.range_key_type
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}
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return results
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def __len__(self):
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count = 0
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for key, value in self.items.iteritems():
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if self.has_range_key:
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count += len(value)
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else:
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count += 1
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return count
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def __nonzero__(self):
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return True
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def put_item(self, item_attrs):
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hash_value = DynamoType(item_attrs.get(self.hash_key_attr))
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if self.has_range_key:
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range_value = DynamoType(item_attrs.get(self.range_key_attr))
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else:
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range_value = None
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item = Item(hash_value, self.hash_key_type, range_value, self.range_key_type, item_attrs)
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if range_value:
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self.items[hash_value][range_value] = item
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else:
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self.items[hash_value] = item
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return item
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def get_item(self, hash_key, range_key):
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if self.has_range_key and not range_key:
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raise ValueError("Table has a range key, but no range key was passed into get_item")
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try:
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if range_key:
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return self.items[hash_key][range_key]
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else:
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return self.items[hash_key]
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except KeyError:
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return None
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def query(self, hash_key, range_comparison, range_objs):
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results = []
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last_page = True # Once pagination is implemented, change this
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if self.range_key_attr:
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possible_results = self.items[hash_key].values()
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else:
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possible_results = list(self.all_items())
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if range_comparison:
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for result in possible_results:
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if result.range_key.compare(range_comparison, range_objs):
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results.append(result)
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else:
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# If we're not filtering on range key, return all values
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results = possible_results
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return results, last_page
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def all_items(self):
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for hash_set in self.items.values():
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if self.range_key_attr:
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for item in hash_set.values():
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yield item
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else:
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yield hash_set
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def scan(self, filters):
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results = []
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scanned_count = 0
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last_page = True # Once pagination is implemented, change this
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for result 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.iteritems():
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attribute = result.attrs.get(attribute_name)
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if attribute:
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# Attribute found
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if not attribute.compare(comparison_operator, comparison_objs):
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passes_all_conditions = False
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break
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elif comparison_operator == 'NULL':
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# Comparison is NULL and we don't have the attribute
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continue
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else:
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# No attribute found and comparison is no NULL. This item fails
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passes_all_conditions = False
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break
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if passes_all_conditions:
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results.append(result)
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return results, scanned_count, last_page
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def delete_item(self, hash_key, range_key):
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try:
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if range_key:
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return self.items[hash_key].pop(range_key)
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else:
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return self.items.pop(hash_key)
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except KeyError:
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return None
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class DynamoDBBackend(BaseBackend):
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def __init__(self):
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self.tables = OrderedDict()
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def create_table(self, name, **params):
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table = Table(name, **params)
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self.tables[name] = table
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return table
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def delete_table(self, name):
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return self.tables.pop(name, None)
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def update_table_throughput(self, name, new_read_units, new_write_units):
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table = self.tables[name]
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table.read_capacity = new_read_units
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table.write_capacity = new_write_units
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return table
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def put_item(self, table_name, item_attrs):
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table = self.tables.get(table_name)
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if not table:
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return None
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return table.put_item(item_attrs)
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def get_item(self, table_name, hash_key_dict, range_key_dict):
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table = self.tables.get(table_name)
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if not table:
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return None
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hash_key = DynamoType(hash_key_dict)
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range_key = DynamoType(range_key_dict) if range_key_dict else None
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return table.get_item(hash_key, range_key)
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def query(self, table_name, hash_key_dict, range_comparison, range_value_dicts):
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table = self.tables.get(table_name)
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if not table:
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return None, None
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hash_key = DynamoType(hash_key_dict)
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range_values = [DynamoType(range_value) for range_value in range_value_dicts]
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return table.query(hash_key, range_comparison, range_values)
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def scan(self, table_name, filters):
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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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scan_filters = {}
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for key, (comparison_operator, comparison_values) in filters.iteritems():
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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)
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def delete_item(self, table_name, hash_key_dict, range_key_dict):
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table = self.tables.get(table_name)
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if not table:
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return None
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hash_key = DynamoType(hash_key_dict)
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range_key = DynamoType(range_key_dict) if range_key_dict else None
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return table.delete_item(hash_key, range_key)
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dynamodb_backend = DynamoDBBackend()
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