yoyo-indexima 0.1.2

Indexima migration schema based on yoyo

yoyo-indexima

Versions following Semantic Versioning

Overview

Indexima migration schema based on yoyo and pyhive.

The little story

In the land of database migration tool, i have tried:

• flyway
• liquidbase with hive extention

Both either did not support hive (as flyway), or indexima did not fully compliant with hive (wich cause probleme with liquidbase)

So I try to found a module not too complex in order to migrate our indexima schema in a safe way.

In this early release, I just trying to do the job.

Setup

Requirements

• Python 3.7+

Installation

Install this library directly into an activated virtual environment:

$ pip install yoyo-indexima

or add it to your Poetry project:

$ poetry add yoyo-indexima

Usage

Hive connection

1. backend ui must start with indexima://
2. If you have trouble to obtain an hive connection, please read http://dwgeek.com/guide-connecting-hiveserver2-using-python-pyhive.html/

Note: If you using python in docker, you should install :

apt-get update -qq
apt-get install -qqy gcc libsasl2-dev libsasl2-2 libsasl2-modules-gssapi-mit 

Migration

You could see a complete sample under 'example' folder.

using python client

yoyo_indexima
usage: yoyo_indexima [-h] [-s SOURCE] -u URI {show,apply}

example:

yoyo_indexima  apply  -s $(pwd)/example/migrations/ -u "indexima://admin:super_password@localhost:10000/default"

Commands:

• show Show migrations
• apply Apply migrations
• reapply Reapply migrations
• rollback Rollback migrations
• mark Mark migrations as applied, without running them
• unmark Unmark applied migrations, without rolling them back
• break-lock Break migration locks

Help for apply:

> yoyo_indexima  apply -h
usage: yoyo_indexima apply [-h] [-s SOURCE] -u URI [-f] [-a] [-r REVISION]
                           [-d]

optional arguments:
  -h, --help            show this help message and exit
  -s SOURCE, --source SOURCE
                        source path of migration script (default ./migrations)
  -u URI, --uri URI     backend uri
  -f, --force           Force apply/rollback of steps even if previous steps
                        have failed
  -a, --all             Select all migrations, regardless of whether they have
                        been previously applied
  -r REVISION, --revision REVISION
                        Apply/rollback migration with id REVISION
  -d, --dry-run         Dry run: no modification will be applied

within python code

If your migrations script are under directory migration folder

import os

from yoyo_indexima import get_backend, read_migrations


if __name__ == "__main__":

    # obtain IndeximaBackend
    backend = get_backend('indexima://admin:super_password@localhost:10000/default?auth=CUSTOM')

    # Read migrations folder
    migrations = read_migrations(os.path.join(os.getcwd(), 'migrations/**/*'))
    print(f'migrations: {migrations}')
    if migrations:
        # apply migration
        with backend.lock():
            backend.apply_migrations(backend.to_apply(migrations))

Management table

This tool create in your default schema:

• a log table: 'yoyo_log'
• a lock_table: 'yoyo_lock'
• a version table: 'yoyo_version'
• a migration table: 'yoyo_migration'

Migration script template

"""
{message}
"""

from yoyo import step

__depends__ = {{{depends}}}

steps = [
    step("create ...", "drop ...")
]

Configure hive connection

In python script, on IndeximaBackendinstance, you could use:

• set_hive_configuration: A dictionary of Hive settings (functionally same as the set command)
• set_hive_thrift_transport: an instance of TSaslClientTransport

As see in https://github.com/dropbox/PyHive/issues/162, you could do things like that:

import sasl
from thrift_sasl import TSaslClientTransport
from thrift.transport.TSocket import TSocket


def create_hive_plain_transport(host, port, username, password, timeout=60):
    socket = TSocket(host, port)
    socket.setTimeout(timeout * 1000)

    sasl_auth = 'PLAIN'

    def sasl_factory():
        sasl_client = sasl.Client()
        sasl_client.setAttr('host', host)
        sasl_client.setAttr('username', username)
        sasl_client.setAttr('password', password)
        sasl_client.init()
        return sasl_client

    return TSaslClientTransport(sasl_factory, sasl_auth, socket)


backend = get_backend('indexima://admin:super_password@localhost:10000/default?auth=CUSTOM')
backend.set_hive_thrift_transport(create_hive_plain_transport(...))

Extends IndeximaBackend

If you extends IndeximaBackend you could register your classes, in the function: get_backend(uri: str, backend=IndeximaBackend) -> DatabaseBackend:

TODO: add a client parameter to specify full class name in cli.

License

The MIT License (MIT)

Contributing

See Contributing

Next step

• production usage in order to see how this tool made the job
• more documentation in code
• purpose few change in 'yoyo' like set all SQL command on Backend class
• ...