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Helps manage migrations for databases and anything else

Project description

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Migrate anything - database (etc.) migration utility, especially for Python projects.

What is this?

It’s kinda annoying how often you run into the question of how to handle migrations in your project, and there hasn’t seem to emerged any good, DB -agnostic, framework-agnostic, and storage-agnostic tool to manage them.

This project is an attempt to change that.

Usage examples

Firstly you’ll need this package in your project. Pick one of these:

pip install -U migrate-anything
poetry add migrate-anything
pipenv install migrate-anything

Simply put, create a Python package, don’t be too clever and call it e.g. migrations. Then put files in that package:

# migrations/__init__.py
from migrate_anything import configure, CSVStorage

configure(storage=CSVStorage("migration_status.csv"))
# migrations/01-initialize-db.py
# Please note that this is built for a completely hypothetical DB layer
from my_db import get_db

DB = get_db()

def up():
    DB.create_table("example")

def down():
    DB.delete_table("example")

This would configure your migrations’ status to be stored in a local file called migration_status.csv and set up your first migration script. If you have a my_db module that works like this you could just run this with the command

migrate-anything migrations

Now in the real world you might want something more durable and a realistic example, so here’s e.g. what you’d do when using MongoDB:

# __init__.py
from migrate_anything import configure, MongoDBStorage
import pymongo

db = pymongo.MongoClient().my_db

configure(storage=MongoDBStorage(db.migrations))
# 01-initialize-db.py
from pymongo import MongoClient

client = MongoClient()
db = client.my_db

def up():
    db.posts.insert_one({
        "id": "post-1",
        "title": "We're live!",
        "content": "This is our first post, yay."
    })
    db.posts.create_index("id")

def down():
    db.posts.drop()

This would configure storage to a my_db.migrations MongoDB collection.

Future ideas include support for other DB engines (feel free to contribute), and Kubernetes ConfigMap. Annoyingly storage to Kubernetes from inside a pod and in code is not quite as simple as just running kubectl.

Oh and your Kubernetes pods will likely require the necessary RBAC rules to manage their ConfigMap. It’s unfortunately kinda complex, but I’m sure you can figure it out e.g. with this guide.

Alternatively you can just write your own - it’s easy.

# __init__.py
from migrate_anything import configure


class CustomStorage(object):
    def __init__(self, file):
        self.file = file

    def save_migration(self, name, code):
        with open(self.file, "a", encoding="utf-8") as file:
            file.write("{},{}\n".format(name, code))

    def list_migrations(self):
        try:
            with open(self.file, encoding="utf-8") as file:
                return [
                    line.split(",")
                    for line in file.readlines()
                    if line.strip()  # Skip empty lines
                ]
        except FileNotFoundError:
            return []

    def remove_migration(self, name):
        migrations = [
            migration for migration in self.list_migrations() if migration[0] != name
        ]

        with open(self.file, "w", encoding="utf-8") as file:
            for row in migrations:
                file.write("{},{}\n".format(*row))


configure(storage=CustomStorage("test.txt"))

You can also check out the examples.

Project details


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