151 lines
5.6 KiB
Python
151 lines
5.6 KiB
Python
# Copyright (c) 2010-2015 OpenStack Foundation
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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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from swift.common.request_helpers import get_sys_meta_prefix
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from swift.common.swob import HTTPMethodNotAllowed, \
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HTTPRequestedRangeNotSatisfiable, Range
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from swift.common.utils import public
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from storlets.swift_middleware.handlers.base import StorletBaseHandler, \
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NotStorletRequest
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class StorletObjectHandler(StorletBaseHandler):
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def __init__(self, request, conf, gateway_conf, app, logger):
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super(StorletObjectHandler, self).__init__(
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request, conf, gateway_conf, app, logger)
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# object need the gateway module only execution
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if (self.is_storlet_execution):
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self._setup_gateway()
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else:
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raise NotStorletRequest()
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def _parse_vaco(self):
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_, _, acc, cont, obj = self.request.split_path(
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5, 5, rest_with_last=True)
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# TODO(kota_): make sure why object server api version is 0?
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return ('0', acc, cont, obj)
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@property
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def is_slo_get_request(self):
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"""
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Determines from a GET request and its associated response
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if the object is a SLO
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"""
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return self.request.params.get('multipart-manifest') == 'get'
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def is_symlink_response(self, resp):
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"""
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Determines whether the response is a symlink one
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:param resp: swob.Response instance
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:return: Whenther the response is a slo one
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"""
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self.logger.debug(
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'Verify if {0} is a symlink'.format(self.path))
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symlink_header = get_sys_meta_prefix('object') + 'symlink-target'
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is_symlink = symlink_header in resp.headers
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if is_symlink:
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self.logger.debug(
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'{0} is indeed a symlink'.format(self.path))
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else:
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self.logger.debug(
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'{0} is NOT a symlink'.format(self.path))
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return is_symlink
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def _get_storlet_invocation_options(self, req):
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options = super(StorletObjectHandler, self).\
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_get_storlet_invocation_options(req)
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# If the request is a storlet request with an single input range, we
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# pass range parameters to storlet gateway, to realize range handling
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# with keepling zero copy
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if self.is_storlet_range_request and \
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not self.is_storlet_multiple_range_request:
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srange = Range(req.headers['X-Storlet-Range'])
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# As we should include the end byte in HTTP Range, here we +1
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# for the end cursor so that we can treat it as general range
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# (include start, and exclude end)
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options['range_start'] = srange.ranges[0][0]
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options['range_end'] = srange.ranges[0][1] + 1
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return options
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def handle_request(self):
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if hasattr(self, self.request.method):
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try:
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handler = getattr(self, self.request.method)
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getattr(handler, 'publicly_accessible')
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except AttributeError:
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# TODO(kota_): add allowed_method list to Allow header
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return HTTPMethodNotAllowed(request=self.request)
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return handler()
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else:
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# un-defined method should be NOT ALLOWED
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raise HTTPMethodNotAllowed(request=self.request)
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def _call_gateway(self, resp):
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sreq = self._build_storlet_request(
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self.request, resp.headers, resp.app_iter)
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return self.gateway.invocation_flow(sreq)
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@public
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def GET(self):
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"""
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GET handler on object-server
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"""
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# The proxy may add a Range header in the case
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# where the execution is to be done on proxy only
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# (and X-Storlet-Range header exists)
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# Hence we allow having a Range header ONLY
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# if there is also X-Storlet-Range
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# Otherwise, running a Storlet together with
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# The HTTP Range header is not allowed
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if self.is_range_request and not self.is_storlet_range_request:
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raise HTTPRequestedRangeNotSatisfiable(
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b'Storlet execution with range header is not supported',
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request=self.request)
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orig_resp = self.request.get_response(self.app)
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if not orig_resp.is_success:
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return orig_resp
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# TODO(takashi): not sure manifest file should not be run with storlet
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not_runnable = any(
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[self.execute_on_proxy,
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self.execute_range_on_proxy,
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self.is_slo_get_request,
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self.is_slo_response(orig_resp),
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self.is_symlink_response(orig_resp)
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])
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if not_runnable:
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# Storlet must be invoked on proxy as it is:
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# either an SLO
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# or storlet-range-request
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# or proxy only mode
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self.logger.debug(
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'storlet_handler: invocation over %s to be executed on proxy'
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% self.request.path)
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return orig_resp
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else:
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# We apply here the Storlet:
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self.logger.debug(
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'storlet_handler: invocation over %s to be executed locally'
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% self.request.path)
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return self.apply_storlet(orig_resp)
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