stroblmeandClaude Opus 5
961a8f881d
One process owns this database — the image has run a single uvicorn worker for that reason since the four-engines bug — so a file beside the flows is the honest shape for it, and it is what lets `fluksio serve` need no infrastructure at all. Live values, node execution and the work queue never came here anyway; what does is a rollup a minute at a time, a row per cascade and the run history, and WAL keeps the readers going while that one writer works. DATA_DIR is now the one setting that moves everything an installation keeps; the rest derive from it and the images still spell theirs out. The schema is prepared in-process at startup, so the prestart service is gone, and the ten Postgres-only revisions collapse into one portable baseline. Three things only worked because psycopg was casting for us: a token's subject arriving as a string where the column is a UUID, `greatest`, and `date_bin`. The timestamps needed a column type of their own — SQLite stores no offset, and a naive datetime read back either raises against an aware `now` or serialises as local time. Postgres stays in the stack only for Umami, behind the analytics profile. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
115 lines
3.3 KiB
Python
Executable File
115 lines
3.3 KiB
Python
Executable File
from logging.config import fileConfig
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from alembic import context
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from sqlalchemy import engine_from_config, pool
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# this is the Alembic Config object, which provides
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# access to the values within the .ini file in use.
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config = context.config
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# Interpret the config file for Python logging.
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# This line sets up loggers basically.
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# Driven from `fluksio.core.db` there is no ini file to read logging from.
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if config.config_file_name is not None:
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fileConfig(config.config_file_name)
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# add your model's MetaData object here
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# for 'autogenerate' support
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# from myapp import mymodel
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# target_metadata = mymodel.Base.metadata
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# target_metadata = None
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from fluksio.models import SQLModel # noqa
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from fluksio.core.config import settings # noqa
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from fluksio.core.types import UTCDateTime # noqa
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target_metadata = SQLModel.metadata
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def render_item(type_, obj, autogen_context):
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"""Write the decorator out as the type it wraps.
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A revision naming `UTCDateTime` would have to import from the app, which
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ties a migration to a version of it. What it stores is a timezone-aware
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timestamp, so that is what the revision says.
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"""
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if type_ == "type" and isinstance(obj, UTCDateTime):
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autogen_context.imports.add("import sqlalchemy as sa")
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return "sa.DateTime(timezone=True)"
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return False
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# other values from the config, defined by the needs of env.py,
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# can be acquired:
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# my_important_option = config.get_main_option("my_important_option")
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# ... etc.
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def get_url():
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return str(settings.SQLALCHEMY_DATABASE_URI)
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def run_migrations_offline():
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"""Run migrations in 'offline' mode.
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This configures the context with just a URL
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and not an Engine, though an Engine is acceptable
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here as well. By skipping the Engine creation
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we don't even need a DBAPI to be available.
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Calls to context.execute() here emit the given string to the
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script output.
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"""
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url = get_url()
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context.configure(
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url=url, target_metadata=target_metadata, literal_binds=True, compare_type=True
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)
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with context.begin_transaction():
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context.run_migrations()
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def run_migrations_online():
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"""Run migrations in 'online' mode.
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In this scenario we need to create an Engine
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and associate a connection with the context.
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"""
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# `fluksio.core.db.migrate` hands us the connection it is already inside;
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# the CLI and `alembic` on the command line make their own.
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connection = config.attributes.get("connection")
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if connection is not None:
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_run(connection)
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return
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configuration = config.get_section(config.config_ini_section)
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configuration["sqlalchemy.url"] = get_url()
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connectable = engine_from_config(
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configuration,
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prefix="sqlalchemy.",
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poolclass=pool.NullPool,
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)
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with connectable.connect() as connection:
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_run(connection)
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def _run(connection):
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context.configure(
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connection=connection,
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target_metadata=target_metadata,
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compare_type=True,
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render_item=render_item,
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# SQLite cannot ALTER much: batch mode rebuilds the table instead.
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render_as_batch=connection.dialect.name == "sqlite",
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)
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with context.begin_transaction():
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context.run_migrations()
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if context.is_offline_mode():
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run_migrations_offline()
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else:
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run_migrations_online()
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