pg-force-execute 0.0.3

Utility function to run a PostgreSQL query with SQLAlchemy, terminating any queries that block it

pg-force-execute

Utility function to run a PostgreSQL query with SQLAlchemy, terminating any queries that continue to block it after a configurable delay.

Installation

pip install pg-force-execute

Usage

import datetime
import sqlalchemy as sa
from pg_force_execute import pg_force_execute

# Run postgresql locally should allow the below to run
# docker run --rm -it -e POSTGRES_HOST_AUTH_METHOD=trust -p 5432:5432 postgres

engine = sa.create_engine('postgresql://postgres@127.0.0.1:5432/')
query = 'SELECT 1'  # A more realistic example would be something that needs an exclusive lock on a table

with engine.begin() as conn:
    results = pg_force_execute(
        sa.text(query), # SQL query to execute
        conn,           # SQLAlchemy connection to run the query
        engine,         # SQLAlchemy engine that will create new connections to cancel blocking queries
        delay=datetime.timedelta(minutes=5),  # Amount of time to wait before cancelling queries
    )
    print(results.fetchall())

Running tests locally

pip install -e ".[dev]"  # Only needed once
./start-services.sh      # Only needed once
pytest