def get_evaluation(json):
"""
Get the result operation for one side
:param json: the object to evaluate
:param side: the side to be evaluate - 'r' is right and 'l' is left
"""
if isinstance(json, dict):
return json if check_type(json, 'num') else remote_call(json)
else:
raise InvalidOperationError(f'Invalid node: {json}')
def add(json):
"""
left + right
"""
if not json.get('t') or json.get('t') != 'add':
raise InvalidOperationError('Add operation was expected')
left = __evaluation(json, 'l')
right = __evaluation(json, 'r')
return get_number(left.get('v') + right.get('v'))
def div(json):
"""
left / right
"""
if not json.get('t') or json.get('t') != 'div':
raise InvalidOperationError('Div operation was expected')
left = __evaluation(json, 'l')
right = __evaluation(json, 'r')
return get_number(left.get('v') / right.get('v'))
def mul(json):
"""
left * right
"""
if not json.get('t') or json.get('t') != 'mul':
raise InvalidOperationError('Mul operation was expected')
left = __evaluation(json, 'l')
right = __evaluation(json, 'r')
return get_number(left.get('v') * right.get('v'))
def sub(json):
"""
left - right
"""
if not json.get('t') or json.get('t') != 'sub':
raise InvalidOperationError('Sub operation was expected')
left = __evaluation(json, 'l')
right = __evaluation(json, 'r')
return get_number(left.get('v') - right.get('v'))
def remote_call(json):
"""
Execute a remote call to evaluate an operation_type
"""
operation_type = json.get('t')
if not operation_type or operation_type.lower() not in _LOCATIONS.keys():
raise InvalidOperationError()
response = requests.post(_LOCATIONS[operation_type.lower()],
data=msgpack.packb(json, raw=False),
headers={'Content-Type': 'application/msgpack'})
return msgpack.unpack(response.content, raw=False)
def __evaluation(json, side):
"""
if current operation is on a side, operate it from local, otherwise call remote evaluation
"""
if not isinstance(json, dict):
raise BadRequestError()
node = json['v'].get(side)
result = div(node) if check_type(node, 'div') else get_evaluation(node)
if not check_type(result, 'num'):
raise InvalidOperationError(f'Cannot process operation for node {result}')
return result