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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (c) 2017 Cisco and/or its affiliates.
#
# 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.
#
from netmodel.model.filter import Filter
from netmodel.model.field_names import FieldNames
ACTION_INSERT = 1
ACTION_SELECT = 2
ACTION_UPDATE = 3
ACTION_DELETE = 4
ACTION_EXECUTE = 5
ACTION_SUBSCRIBE = 6
ACTION_UNSUBSCRIBE = 7
ACTION2STR = {
ACTION_INSERT : 'insert',
ACTION_SELECT : 'select',
ACTION_UPDATE : 'update',
ACTION_DELETE : 'delete',
ACTION_EXECUTE : 'execute',
ACTION_SUBSCRIBE : 'subscribe',
ACTION_UNSUBSCRIBE : 'unsubscribe',
}
STR2ACTION = dict((v, k) for k, v in ACTION2STR.items())
FUNCTION_SUM = 1
FUNCTION2STR = {
FUNCTION_SUM : 'sum'
}
STR2FUNCTION = dict((v, k) for k, v in FUNCTION2STR.items())
class Query:
def __init__(self, action, object_name, filter = None, params = None,
field_names = None, aggregate = None, last = False, reply = False):
self.action = action
self.object_name = object_name
if filter:
if isinstance(filter, Filter):
self.filter = filter
else:
self.filter = Filter.from_list(filter)
else:
self.filter = Filter()
self.params = params
if field_names:
if isinstance(field_names, FieldNames):
self.field_names = field_names
else:
self.field_names = FieldNames(field_names)
else:
self.field_names = FieldNames()
self.aggregate = aggregate
self.last = last
self.reply = reply
def to_dict(self):
aggregate = FUNCTION2STR[self.aggregate] if self.aggregate else None
return {
'action': ACTION2STR[self.action],
'object_name': self.object_name,
'filter': self.filter.to_list(),
'params': self.params,
'field_names': self.field_names,
'aggregate': aggregate,
'reply': self.reply,
'last': self.last
}
@staticmethod
def from_dict(dic):
action = STR2ACTION[dic.get('action').lower()]
object_name = dic.get('object_name')
filter = dic.get('filter', None)
params = dic.get('params', None)
field_names = dic.get('field_names', None)
aggregate = STR2FUNCTION[dic.get('aggregate').lower()] \
if dic.get('aggregate') else None
if field_names == '*':
field_names = FieldNames(star = True)
last = dic.get('last', False)
reply = dic.get('reply', False)
return Query(action, object_name, filter, params, field_names,
aggregate, last)
def to_sql(self, multiline = False):
"""
Args:
platform: A String corresponding to a namespace (or platform name)
multiline: A boolean indicating whether the String could contain
carriage return.
Returns:
The String representing this Query.
"""
get_params_str = lambda : ", ".join(["%s = %r" % (k, v) \
for k, v in self.params.items()])
object_name = self.object_name
field_names = self.field_names
field_names_str = ('*' if field_names.is_star() \
else ', '.join([field for field in field_names]))
select = "SELECT %s" % ((FUNCTION2STR[self.aggregate] + "(%s)") \
if self.aggregate else '%s') % field_names_str
filter = "WHERE %s" % self.filter if self.filter else ''
#at = "AT %s" % self.get_timestamp() if self.get_timestamp() else ""
at = ''
params = "SET %s" % get_params_str() if self.params else ''
sep = " " if not multiline else "\n "
strmap = {
ACTION_SELECT : "%(select)s%(sep)s%(at)s%(sep)sFROM %(object_name)s%(sep)s%(filter)s",
ACTION_UPDATE : "UPDATE %(object_name)s%(sep)s%(params)s%(sep)s%(filter)s%(sep)s%(select)s",
ACTION_INSERT : "INSERT INTO %(object_name)s%(sep)s%(params)s",
ACTION_DELETE : "DELETE FROM %(object_name)s%(sep)s%(filter)s",
ACTION_SUBSCRIBE : "SUBSCRIBE : %(select)s%(sep)s%(at)s%(sep)sFROM %(object_name)s%(sep)s%(filter)s",
ACTION_UNSUBSCRIBE : "UNSUBSCRIBE : %(select)s%(sep)s%(at)s%(sep)sFROM %(object_name)s%(sep)s%(filter)s",
ACTION_EXECUTE : "EXECUTE : %(select)s%(sep)s%(at)s%(sep)sFROM %(object_name)s%(sep)s%(filter)s",
}
return strmap[self.action] % locals()
def __repr__(self):
return self.to_sql()
__str__ = __repr__
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