61f84d03ca
The syntax is
Try:
- Throw: ns:name #can be list of names to simulate type hierarchy
Message: message #optional
Cause: $sourceException #optional
Extra: { 'someExtra': 'data' } #optional
Catch:
- With: ns:name #can be list of names
- As: exception #optional
- Do:
- Rethrow:
Else: #optional
- else block
Finally: #optional
- finally block
Improves stack traces to contain information about Python native stack frames and macro blocks
Change-Id: I2e2bcc5e1a0da5f9489d73525f8b3fa99cc0220c
Implements: blueprint muranopl-exception-handling
113 lines
3.4 KiB
Python
113 lines
3.4 KiB
Python
# Copyright (c) 2014 Mirantis, Inc.
|
|
#
|
|
# 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.
|
|
|
|
import types
|
|
|
|
import murano.dsl.dsl_exception as dsl_exception
|
|
import murano.dsl.helpers as helpers
|
|
import murano.dsl.lhs_expression as lhs_expression
|
|
import murano.dsl.yaql_expression as yaql_expression
|
|
|
|
_macros = []
|
|
|
|
|
|
class InstructionStub(object):
|
|
def __init__(self, title, position):
|
|
self._title = title
|
|
self.source_file_position = position
|
|
|
|
def __str__(self):
|
|
return self._title
|
|
|
|
|
|
def register_macro(cls):
|
|
_macros.append(cls)
|
|
|
|
|
|
class DslExpression(object):
|
|
def execute(self, context, murano_class):
|
|
pass
|
|
|
|
|
|
class Statement(DslExpression):
|
|
def __init__(self, statement):
|
|
if isinstance(statement, yaql_expression.YaqlExpression):
|
|
key = None
|
|
value = statement
|
|
elif isinstance(statement, types.DictionaryType):
|
|
if len(statement) != 1:
|
|
raise SyntaxError()
|
|
key = statement.keys()[0]
|
|
value = statement[key]
|
|
else:
|
|
raise SyntaxError()
|
|
|
|
self._destination = lhs_expression.LhsExpression(key) if key else None
|
|
self._expression = value
|
|
|
|
@property
|
|
def destination(self):
|
|
return self._destination
|
|
|
|
@property
|
|
def expression(self):
|
|
return self._expression
|
|
|
|
def execute(self, context, murano_class):
|
|
try:
|
|
result = helpers.evaluate(self.expression, context)
|
|
if self.destination:
|
|
self.destination(result, context, murano_class)
|
|
return result
|
|
except dsl_exception.MuranoPlException:
|
|
raise
|
|
except Exception as e:
|
|
raise dsl_exception.MuranoPlException.from_python_exception(
|
|
e, context)
|
|
|
|
|
|
def parse_expression(expr):
|
|
result = None
|
|
if isinstance(expr, yaql_expression.YaqlExpression):
|
|
result = Statement(expr)
|
|
elif isinstance(expr, types.DictionaryType):
|
|
kwds = {}
|
|
for key, value in expr.iteritems():
|
|
if isinstance(key, yaql_expression.YaqlExpression):
|
|
if result is not None:
|
|
raise ValueError()
|
|
result = Statement(expr)
|
|
else:
|
|
kwds[key] = value
|
|
|
|
if result is None:
|
|
for cls in _macros:
|
|
try:
|
|
macro = cls(**kwds)
|
|
position = None
|
|
title = 'block construct'
|
|
if hasattr(expr, 'source_file_position'):
|
|
position = expr.source_file_position
|
|
if '__str__' in cls.__dict__:
|
|
title = str(macro)
|
|
macro.virtual_instruction = InstructionStub(
|
|
title, position)
|
|
return macro
|
|
except TypeError:
|
|
continue
|
|
|
|
if result is None:
|
|
raise SyntaxError()
|
|
return result
|