89 lines
2.6 KiB
Python
Executable file
89 lines
2.6 KiB
Python
Executable file
#!/usr/bin/env python3
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from pathlib import Path
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from itertools import islice
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import logging
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from location import _load_locations, Location, get_logger
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import sqlalchemy as sa # type: ignore
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from kython import ichunks
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# TODO wonder if possible to extract schema automatically?
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def xx_obj():
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return Location(
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dt=sa.types.TIMESTAMP(timezone=True), # TODO tz?
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# TODO FIXME utc seems to be lost.. doesn't sqlite support it or what?
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lat=sa.Float,
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lon=sa.Float,
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alt=sa.Float, # TODO nullable
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tag=sa.String,
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)
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def make_schema(obj):
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return [sa.Column(col, tp) for col, tp in obj._asdict().items()]
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def cache_locs(source: Path, db_path: Path, limit=None):
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db = sa.create_engine(f'sqlite:///{db_path}')
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engine = db.connect() # TODO do I need to tear anything down??
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meta = sa.MetaData(engine)
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schema = make_schema(xx_obj())
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sa.Table('locations', meta, *schema)
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meta.create_all()
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table = sa.table('locations', *schema)
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with source.open('r') as fo:
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# TODO fuck. do I really need to split myself??
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# sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) too many SQL variables
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# TODO count deprecated??
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# print(engine.execute(table.count()).fetchone())
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for chunk in ichunks(islice(_load_locations(fo), 0, limit), 10000):
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engine.execute(table.insert().values(chunk))
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# TODO maintain order during insertion?
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def iter_db_locs(db_path: Path):
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db = sa.create_engine(f'sqlite:///{db_path}')
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engine = db.connect() # TODO do I need to tear anything down??
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meta = sa.MetaData(engine)
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schema = make_schema(xx_obj())
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sa.Table('locations', meta, *schema)
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meta.create_all()
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table = sa.table('locations', *schema)
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datas = engine.execute(table.select()).fetchall()
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yield from (Location(**d) for d in datas)
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def test(tmp_path):
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tdir = Path(tmp_path)
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tdb = tdir / 'test.sqlite'
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test_src = Path('/L/tmp/loc/LocationHistory.json')
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test_limit = 100
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cache_locs(source=test_src, db_path=tdb, limit=test_limit)
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locs = list(iter_db_locs(tdb))
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assert len(locs) == test_limit
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def main():
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from kython import setup_logzero
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setup_logzero(get_logger(), level=logging.DEBUG)
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db_path = Path('test3.sqlite')
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# if db_path.exists():
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# db_path.unlink()
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locs = iter_db_locs(db_path)
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print(len(list(locs)))
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# TODO is it quicker to insert anyway? needs unique policy
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# ok, very nice. the whold db is just 20mb now
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# nice, and loads in seconds basically
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# TODO FIXME just need to check timezone
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if __name__ == '__main__':
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main()
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