def scan(self, req, body, project_id, table_name):
utils.check_project_id(req.context, project_id)
req.context.tenant = project_id
with probe.Probe(__name__ + '.validation'):
validation.validate_object(body, "body")
# get attributes_to_get
attributes_to_get = body.pop(parser.Props.ATTRIBUTES_TO_GET, None)
if attributes_to_get:
validation.validate_list(attributes_to_get,
parser.Props.ATTRIBUTES_TO_GET)
for attr_name in attributes_to_get:
validation.validate_attr_name(attr_name)
select = body.pop(parser.Props.SELECT, None)
if select is None:
if attributes_to_get:
select = models.SelectType.SELECT_TYPE_SPECIFIC
else:
select = models.SelectType.SELECT_TYPE_ALL
else:
validation.validate_string(select, parser.Props.SELECT)
select_type = models.SelectType(select, attributes_to_get)
limit = body.pop(parser.Props.LIMIT, None)
if limit is not None:
limit = validation.validate_integer(limit,
parser.Props.LIMIT,
min_val=0)
# parse exclusive_start_key_attributes
exclusive_start_key_attributes_json = body.pop(
parser.Props.EXCLUSIVE_START_KEY, None)
if exclusive_start_key_attributes_json is not None:
validation.validate_object(exclusive_start_key_attributes_json,
parser.Props.EXCLUSIVE_START_KEY)
exclusive_start_key_attributes = (
parser.Parser.parse_item_attributes(
exclusive_start_key_attributes_json))
else:
exclusive_start_key_attributes = None
scan_filter_json = body.pop(parser.Props.SCAN_FILTER, None)
if scan_filter_json:
validation.validate_object(scan_filter_json,
parser.Props.SCAN_FILTER)
condition_map = parser.Parser.parse_attribute_conditions(
scan_filter_json, condition_class=ScanCondition)
else:
condition_map = None
total_segments = body.pop(parser.Props.TOTAL_SEGMENTS, 1)
total_segments = validation.validate_integer(
total_segments,
parser.Props.TOTAL_SEGMENTS,
min_val=1,
max_val=4096)
segment = body.pop(parser.Props.SEGMENT, 0)
segment = validation.validate_integer(segment,
parser.Props.SEGMENT,
min_val=0,
max_val=total_segments)
validation.validate_unexpected_props(body, "body")
result = storage.scan(
req.context,
table_name,
condition_map,
attributes_to_get=attributes_to_get,
limit=limit,
exclusive_start_key=exclusive_start_key_attributes)
response = {
parser.Props.COUNT: result.count,
parser.Props.SCANNED_COUNT: result.scanned_count
}
if not select_type.is_count:
response[parser.Props.ITEMS] = [
parser.Parser.format_item_attributes(row)
for row in result.items
]
if result.last_evaluated_key:
response[parser.Props.LAST_EVALUATED_KEY] = (
parser.Parser.format_item_attributes(
result.last_evaluated_key))
return response
def query(self, req, body, project_id, table_name):
with probe.Probe(__name__ + '.validation'):
validation.validate_object(body, "body")
# get attributes_to_get
attributes_to_get = body.pop(parser.Props.ATTRIBUTES_TO_GET, None)
if attributes_to_get is not None:
validation.validate_list(attributes_to_get,
parser.Props.ATTRIBUTES_TO_GET)
for attr_name in attributes_to_get:
validation.validate_attr_name(attr_name)
index_name = body.pop(parser.Props.INDEX_NAME, None)
if index_name is not None:
validation.validate_index_name(index_name)
select = body.pop(parser.Props.SELECT, None)
if select is None:
if attributes_to_get:
select = models.SelectType.SELECT_TYPE_SPECIFIC
else:
if index_name is not None:
select = models.SelectType.SELECT_TYPE_ALL_PROJECTED
else:
select = models.SelectType.SELECT_TYPE_ALL
else:
validation.validate_string(select, parser.Props.SELECT)
select_type = models.SelectType(select, attributes_to_get)
# parse exclusive_start_key_attributes
exclusive_start_key_attributes_json = body.pop(
parser.Props.EXCLUSIVE_START_KEY, None)
if exclusive_start_key_attributes_json is not None:
validation.validate_object(exclusive_start_key_attributes_json,
parser.Props.EXCLUSIVE_START_KEY)
exclusive_start_key_attributes = (
parser.Parser.parse_item_attributes(
exclusive_start_key_attributes_json))
else:
exclusive_start_key_attributes = None
# parse indexed_condition_map
key_conditions = body.pop(parser.Props.KEY_CONDITIONS, None)
validation.validate_object(key_conditions,
parser.Props.KEY_CONDITIONS)
indexed_condition_map = parser.Parser.parse_attribute_conditions(
key_conditions, condition_class=IndexedCondition)
# TODO(dukhlov):
# it would be nice to validate given table_name, key_attributes and
# attributes_to_get to schema expectation
consistent_read = body.pop(parser.Props.CONSISTENT_READ, False)
validation.validate_boolean(consistent_read,
parser.Props.CONSISTENT_READ)
limit = body.pop(parser.Props.LIMIT, None)
if limit is not None:
limit = validation.validate_integer(limit,
parser.Props.LIMIT,
min_val=0)
scan_forward = body.pop(parser.Props.SCAN_INDEX_FORWARD, None)
if scan_forward is not None:
validation.validate_boolean(scan_forward,
parser.Props.SCAN_INDEX_FORWARD)
order_type = (models.ORDER_TYPE_ASC
if scan_forward else models.ORDER_TYPE_DESC)
else:
order_type = None
validation.validate_unexpected_props(body, "body")
# select item
result = storage.query(
req.context,
table_name,
indexed_condition_map,
select_type=select_type,
index_name=index_name,
limit=limit,
consistent=consistent_read,
order_type=order_type,
exclusive_start_key=exclusive_start_key_attributes)
# format response
if select_type.type == models.SelectType.SELECT_TYPE_COUNT:
response = {parser.Props.COUNT: result.count}
else:
response = {
parser.Props.COUNT:
result.count,
parser.Props.ITEMS: [
parser.Parser.format_item_attributes(row)
for row in result.items
]
}
if limit == result.count:
response[parser.Props.LAST_EVALUATED_KEY] = (
parser.Parser.format_item_attributes(
result.last_evaluated_key))
return response