#!/bin/bash

set -o errexit
set -o pipefail
set -o nounset

. /venv/bin/activate


# N.B. If only .env files supported variable expansion...
export CELERY_BROKER_URL="${REDIS_URL}"


if [ -z "${POSTGRES_USER}" ]; then
    base_postgres_image_default_user='postgres'
    export POSTGRES_USER="${base_postgres_image_default_user}"
fi
export DATABASE_URL="postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${POSTGRES_HOST}:${POSTGRES_PORT}/${POSTGRES_DB}"

python << END
import sys
import time

import psycopg2

suggest_unrecoverable_after = 30
start = time.time()

while True:
    try:
        psycopg2.connect(
            dbname="${POSTGRES_DB}",
            user="${POSTGRES_USER}",
            password="${POSTGRES_PASSWORD}",
            host="${POSTGRES_HOST}",
            port="${POSTGRES_PORT}",
        )
        break
    except psycopg2.OperationalError as error:
        sys.stderr.write("Waiting for PostgreSQL to become available...\n")

        if time.time() - start > suggest_unrecoverable_after:
            sys.stderr.write("  This is taking longer than expected. The following exception may be indicative of an unrecoverable error: '{}'\n".format(error))

    time.sleep(1)
END

>&2 echo 'PostgreSQL is available'

exec "$@"