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"""Ensures the metricity db exists before running migrations."""
import os
from urllib.parse import SplitResult, urlsplit
import psycopg2
from psycopg2 import sql
from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT
def parse_db_url(db_url: str) -> SplitResult:
"""Validate and split the given databse url."""
db_url_parts = urlsplit(db_url)
if not all((
db_url_parts.hostname,
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
if __name__ == "__main__":
database_parts = parse_db_url(os.environ["DATABASE_URI"])
conn = psycopg2.connect(
host=database_parts.hostname,
port=database_parts.port,
user=database_parts.username,
password=database_parts.password
)
db_name = database_parts.path[1:] or "metricity"
# Required to create a database in a .execute() call
conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
with conn.cursor() as cursor:
cursor.execute("SELECT 1 FROM pg_catalog.pg_database WHERE datname = %s", (db_name,))
exists = cursor.fetchone()
if not exists:
print("Creating metricity database.")
cursor.execute(
sql.SQL("CREATE DATABASE {dbname}").format(dbname=sql.Identifier(db_name))
)
conn.close()
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