Convert PLATFORM_RELATIONSHIPS to DATABASE_URL

Goal

PLATFORM_RELATIONSHIPS contains the information you need to connect to your database. But you need to extract that information to use it in your app. We provide a laravel-bridge and symfony-flex-bridge to make this plug and play.

But if you have a CMS that we have not created a bridge for, this article is for you.

Steps

1. Create a .environment file in the root of your project

An .environment file is like a .bashrc file. It will run every deploy, and when you ssh into the container.
We can use the .environment file to add a bit of logic to convert PLATFORM_RELATIONSHIPS into a usable form.

In this case, an environment variable DATABASE_URL will be created that can then be used by your CMS.

Feel free to copy/edit and share this file to your liking.

#!/bin/bash
# This script can be a starting point to convert
# PLATFORM_RELATIONSHIPS into another environment variable
# Many CMS systems use a DATABASE_URL to connect to the database
# Feel free to use this as inspiration

getRelationshipInfo() {
    RELATIONSHIP_NAME="$1"
    PROPERTY="$2"
    JQ_STR="to_entries[] | select(.key==\"$RELATIONSHIP_NAME\") | .value[].$PROPERTY"
    CMD="echo $PLATFORM_RELATIONSHIPS | base64 -d | jq -r '$JQ_STR'"
    eval $CMD
}


# choose the name of the relationship to parse, feel free to alter this
RELATIONSHIP="db"
DB_DATABASE="main"

# Extract the information we need
DB_TYPE=$(getRelationshipInfo "$RELATIONSHIP" 'scheme')
DB_USERNAME=$(getRelationshipInfo "$RELATIONSHIP" 'username')
DB_HOST=$(getRelationshipInfo "$RELATIONSHIP" 'host')
DB_PASS=$(getRelationshipInfo "$RELATIONSHIP" 'password')
DB_PORT=$(getRelationshipInfo "$RELATIONSHIP" 'port')

# Create your DATABASE_URL variable here
export DATABASE_URL="mysql://$DB_USERNAME:$DB_PASS@$DB_HOST:$DB_PORT/$DB_DATABASE"

# So now we have mysql://user:@db_mysql.internal:3306/main
# echo "$DATABASE_URL" #only echo to test since it will expose the credentials