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comparison libervia/backend/__init__.py @ 4362:d34b17bce612

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core: Add a "Global" variable with a `LiberviaBackend` singleton to `libervia.backend`.
author Goffi <goffi@goffi.org>
date Tue, 06 May 2025 00:16:15 +0200
parents 10b6ad569157
children
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4361:676a320415b9 4362:d34b17bce612
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU Affero General Public License for more details. 14 # GNU Affero General Public License for more details.
15 15
16 # You should have received a copy of the GNU Affero General Public License 16 # You should have received a copy of the GNU Affero General Public License
17 # along with this program. If not, see <http://www.gnu.org/licenses/>. 17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
18 from typing import TYPE_CHECKING
18 from sat_tmp import wokkel 19 from sat_tmp import wokkel
19 20
20 __version__ = "0.9.0.dev0" 21 __version__ = "0.9.0.dev0"
21 22
22 if not wokkel.installed: 23 if not wokkel.installed:
23 wokkel.install() 24 wokkel.install()
25
26 if TYPE_CHECKING:
27 from libervia.backend.core.main import LiberviaBackend
28 from libervia.backend.memory.sqla import Storage
29
30
31 class Global:
32
33 def __init__(self):
34 self._host: "LiberviaBackend|None" = None
35
36 def set_host(self, host: "LiberviaBackend") -> None:
37 """This method set the backend, and must be called once."""
38 assert self._host is None
39 self._host = host
40
41 @property
42 def host(self) -> "LiberviaBackend":
43 assert self._host is not None
44 return self._host
45
46 @property
47 def storage(self) -> "Storage":
48 return self.host.memory.storage
49
50 G = Global()