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57 lines
1.4 KiB
Python
57 lines
1.4 KiB
Python
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"""Automatic migration tools for the da:ta stored in MongoDB."""
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import logging
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from abc import ABC
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from abc import abstractmethod
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from typing import List
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from typing import Type
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from config import DB
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logger = logging.getLogger(__name__)
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# Used to keep track of all the defined migrations
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_MIGRATIONS: List[Type["Migration"]] = []
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def perform() -> None:
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"""Perform all the defined migration."""
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for migration in _MIGRATIONS:
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migration().perform()
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class Migration(ABC):
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"""Abstract class for migrations."""
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def __init__(self) -> None:
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self.name = self.__class__.__qualname__
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self._col = DB.migrations
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def __init_subclass__(cls, **kwargs):
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super().__init_subclass__(**kwargs)
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_MIGRATIONS.append(cls)
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def _apply(self) -> None:
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self._col.insert_one({"name": self.name})
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def _reset(self) -> None:
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self._col.delete_one({"name": self.name})
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def _is_applied(self) -> bool:
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return bool(self._col.find_one({"name": self.name}))
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@abstractmethod
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def migrate(self) -> None:
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"""Expected to be implemented by actual migrations."""
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pass
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def perform(self) -> None:
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if self._is_applied():
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logger.info(f"Skipping migration {self.name} (already applied)")
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return
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logger.info(f"Performing migration {self.name}...")
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self.migrate()
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self._apply()
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logger.info("Done")
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