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"""Ensures the metricity db exists before running migrations."""
import asyncio
from urllib.parse import SplitResult, urlsplit
import asyncpg
from metricity.database import build_db_uri
def parse_db_url(db_url: str) -> SplitResult:
"""Validate and split the given database url."""
db_url_parts = urlsplit(db_url)
if not all((
db_url_parts.netloc,
db_url_parts.username,
db_url_parts.password,
)):
raise ValueError("The given db_url is not a valid PostgreSQL database URL.")
return db_url_parts
async def create_db() -> None:
"""Create the Metricity database if it does not exist."""
parts = parse_db_url(build_db_uri())
try:
await asyncpg.connect(
host=parts.hostname,
port=parts.port,
user=parts.username,
database=parts.path[1:],
password=parts.password,
)
except asyncpg.InvalidCatalogNameError:
print("Creating metricity database.") # noqa: T201
sys_conn = await asyncpg.connect(
database="template1",
user=parts.username,
host=parts.hostname,
port=parts.port,
password=parts.password,
)
await sys_conn.execute(
f'CREATE DATABASE "{parts.path[1:] or "metricity"}" OWNER "{parts.username}"',
)
await sys_conn.close()
if __name__ == "__main__":
loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
asyncio.get_event_loop().run_until_complete(create_db())
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