265 lines
8.5 KiB
Python
265 lines
8.5 KiB
Python
# Copyright (c) 2013 Mirantis Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import traceback
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import flask
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from oslo_log import log as logging
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import oslo_messaging as messaging
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from oslo_serialization import jsonutils
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from werkzeug import datastructures
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from blazar.api import context
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from blazar.db import exceptions as db_exceptions
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from blazar import exceptions as ex
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from blazar.i18n import _
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from blazar.manager import exceptions as manager_exceptions
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LOG = logging.getLogger(__name__)
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class Rest(flask.Blueprint):
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"""REST helper class."""
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def get(self, rule, status_code=200):
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return self._mroute('GET', rule, status_code)
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def post(self, rule, status_code=202):
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return self._mroute('POST', rule, status_code)
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def put(self, rule, status_code=202):
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return self._mroute('PUT', rule, status_code)
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def delete(self, rule, status_code=204):
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return self._mroute('DELETE', rule, status_code)
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def _mroute(self, methods, rule, status_code=None, **kw):
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"""Route helper method."""
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if type(methods) is str:
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methods = [methods]
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return self.route(rule, methods=methods, status_code=status_code, **kw)
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def route(self, rule, **options):
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"""Routes REST method and its params to the actual request."""
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status = options.pop('status_code', None)
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file_upload = options.pop('file_upload', False)
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def decorator(func):
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endpoint = options.pop('endpoint', func.__name__)
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def handler(**kwargs):
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LOG.debug("Rest.route.decorator.handler, kwargs=%s", kwargs)
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_init_resp_type(file_upload)
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# update status code
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if status:
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flask.request.status_code = status
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if flask.request.method in ['POST', 'PUT']:
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kwargs['data'] = request_data()
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with context.ctx_from_headers(flask.request.headers):
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try:
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return func(**kwargs)
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except ex.BlazarException as e:
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return bad_request(e)
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except messaging.RemoteError as e:
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# Get the exception from manager and common exceptions
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cls = getattr(manager_exceptions, e.exc_type,
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getattr(ex, e.exc_type, None))
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if cls is not None:
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return render_error_message(cls.code, e.value,
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cls.code)
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else:
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# Get the exception from db exceptions and hide
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# the message because could contain table/column
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# information
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cls = getattr(db_exceptions, e.exc_type, None)
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if cls is not None:
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return render_error_message(
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cls.code,
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'{0}: A database error occurred'.format(
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cls.__name__),
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cls.code)
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else:
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# We obfuscate all Exceptions
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# but Blazar ones for
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# security reasons
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err = 'Internal Server Error'
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return internal_error(500, err, e)
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except Exception as e:
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return internal_error(500, 'Internal Server Error', e)
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self.add_url_rule(rule, endpoint, handler, **options)
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self.add_url_rule(rule + '.json', endpoint, handler, **options)
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return func
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return decorator
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RT_JSON = datastructures.MIMEAccept([("application/json", 1)])
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def _init_resp_type(file_upload):
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"""Extracts response content type."""
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# get content type from Accept header
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resp_type = flask.request.accept_mimetypes
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# url /foo.json
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if flask.request.path.endswith('.json'):
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resp_type = RT_JSON
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flask.request.resp_type = resp_type
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# set file upload flag
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flask.request.file_upload = file_upload
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def render(result=None, response_type=None, status=None, **kwargs):
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"""Render response to return."""
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if not result:
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result = {}
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if type(result) is dict:
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result.update(kwargs)
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elif kwargs:
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# can't merge kwargs into the non-dict res
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abort_and_log(500,
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_("Non-dict and non-empty kwargs passed to render."))
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return
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status_code = getattr(flask.request, 'status_code', None)
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if status:
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status_code = status
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if not status_code:
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status_code = 200
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if not response_type:
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response_type = getattr(flask.request, 'resp_type', RT_JSON)
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serializer = None
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if "application/json" in response_type:
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response_type = RT_JSON
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serializer = jsonutils
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else:
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abort_and_log(400,
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_("Content type '%s' isn't supported") % response_type)
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return
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body = serializer.dump_as_bytes(result)
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response_type = str(response_type)
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return flask.Response(response=body, status=status_code,
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mimetype=response_type)
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def request_data():
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"""Method called to process POST and PUT REST methods."""
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if hasattr(flask.request, 'parsed_data'):
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return flask.request.parsed_data
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if not flask.request.content_length > 0:
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LOG.debug("Empty body provided in request")
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return dict()
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if flask.request.file_upload:
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return flask.request.data
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deserializer = None
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content_type = flask.request.mimetype
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if not content_type or content_type in RT_JSON:
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deserializer = jsonutils
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else:
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abort_and_log(400,
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_("Content type '%s' isn't supported") % content_type)
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return
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# parsed request data to avoid unwanted re-parsings
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parsed_data = deserializer.loads(flask.request.data)
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flask.request.parsed_data = parsed_data
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return flask.request.parsed_data
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def get_request_args():
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return flask.request.args
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def abort_and_log(status_code, descr, exc=None):
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"""Process occurred errors."""
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LOG.error("Request aborted with status code %(code)s and "
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"message '%(msg)s'", {'code': status_code, 'msg': descr})
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if exc is not None:
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LOG.error(traceback.format_exc())
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flask.abort(status_code, description=descr)
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def render_error_message(error_code, error_message, error_name):
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"""Render nice error message."""
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message = {
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"error_code": error_code,
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"error_message": error_message,
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"error_name": error_name
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}
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resp = render(message)
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resp.status_code = error_code
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return resp
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def internal_error(status_code, descr, exc=None):
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"""Called if internal error occurred."""
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LOG.error("Request aborted with status code %(code)s "
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"and message '%(msg)s'", {'code': status_code, 'msg': descr})
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if exc is not None:
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LOG.error(traceback.format_exc())
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error_code = "INTERNAL_SERVER_ERROR"
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if status_code == 501:
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error_code = "NOT_IMPLEMENTED_ERROR"
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return render_error_message(status_code, descr, error_code)
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def bad_request(error):
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"""Called if Blazar exception occurred."""
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if not error.code:
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error.code = 400
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LOG.debug("Validation Error occurred: error_code=%(code)s, "
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"error_message=%(msg)s, error_name=%(name)s",
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{'code': error.code, 'msg': str(error), 'name': error.code})
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return render_error_message(error.code, str(error), error.code)
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def not_found(error):
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"""Called if object was not found."""
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if not error.code:
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error.code = 404
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LOG.debug("Not Found exception occurred: error_code=%(code)s, "
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"error_message=%(msg)s, error_name=%(name)s",
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{'code': error.code, 'msg': str(error), 'name': error.code})
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return render_error_message(error.code, str(error), error.code)
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