134 lines
3.5 KiB
Python
134 lines
3.5 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 threading
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import eventlet
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from eventlet import corolocal
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from savanna.db import api as db_api
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from savanna.openstack.common import log as logging
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LOG = logging.getLogger(__name__)
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# TODO(slukjanov): it'll be better to use common_context.RequestContext as base
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class Context(object):
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def __init__(self, user_id, tenant_id, auth_token, headers, **kwargs):
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if kwargs:
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LOG.warn('Arguments dropped when creating context: %s', kwargs)
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self.user_id = user_id
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self.tenant_id = tenant_id
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self.auth_token = auth_token
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self.headers = headers
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self._db_session = None
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def clone(self):
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return Context(self.user_id,
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self.tenant_id,
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self.auth_token,
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self.headers)
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@property
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def session(self):
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if self._db_session is None:
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self._db_session = db_api.get_session()
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return self._db_session
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_CTXS = threading.local()
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_CTXS._curr_ctxs = {}
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def has_ctx():
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ident = corolocal.get_ident()
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return ident in _CTXS._curr_ctxs and _CTXS._curr_ctxs[ident]
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def ctx():
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if not has_ctx():
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# TODO(slukjanov): replace with specific error
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raise RuntimeError("Context isn't available here")
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return _CTXS._curr_ctxs[corolocal.get_ident()]
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def current():
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return ctx()
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def session(context=None):
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context = context or ctx()
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return context.session
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def set_ctx(new_ctx):
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ident = corolocal.get_ident()
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if not new_ctx and ident in _CTXS._curr_ctxs:
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del _CTXS._curr_ctxs[ident]
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if new_ctx:
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_CTXS._curr_ctxs[ident] = new_ctx
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def model_query(model, context=None, project_only=None):
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context = context or ctx()
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query = context.session.query(model)
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if project_only:
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query = query.filter_by(tenant_id=context.tenant_id)
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return query
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def model_save(model, context=None):
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context = context or ctx()
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with context.session.begin():
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context.session.add(model)
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return model
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def model_update(model, context=None, **kwargs):
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if not hasattr(model, '__table__'):
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# TODO(slikjanov): replace with specific exception
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raise RuntimeError("Specified object isn't model, class: %s"
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% model.__class__.__name__)
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columns = model.__table__.columns
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for prop in kwargs:
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if prop not in columns:
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# TODO(slukjanov): replace with specific exception
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raise RuntimeError(
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"Model class '%s' doesn't contains specified property '%s'"
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% (model.__class__.__name__, prop))
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setattr(model, prop, kwargs[prop])
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return model_save(model, context)
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def spawn(func, *args, **kwargs):
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ctx = current().clone()
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def wrapper(ctx, func, *args, **kwargs):
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set_ctx(ctx)
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func(*args, **kwargs)
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eventlet.spawn(wrapper, ctx, func, *args, **kwargs)
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def sleep(seconds=0):
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eventlet.sleep(seconds)
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