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A python toolset to manage postgres migrations and testing

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Saitama: A postgres migrations manager and test runner

Saitama offers an easy way to manage migrations and run postgres unittests.

Installation

The easiest way is to use pip to install saitama.

pip install --user saitama

Configuration

To configure saitama for your project, you can use any toml file.

[tool.saitama]
host = "<postgres host>"
port = "<postgres port>"
dbname = "<postgres database name>"
user = "<postgres user>"
password = "<postgres password>"
migrations = "<path to migrations dir>"
tests = "<path to tests dir>"

All of settings are optional, and the default host, port, dbname, user and password are the ones specified by psycopg2, the default migrations directory is migrations/, relative to the parent directory of the toml file, and the default test directory is tests/, again relative to the toml file.

Usage

Saitama, once installed offers a single command, punch, that controls the migrations and the testing. punch follows the GNU recommendations for command line interfaces, and offers:

  • -h or --help to print help, and
  • -V or --version to print the version

Migrations

You can use punch to migrate forward or backward to a specific migration. The migrations should be named \d+_.+\.sql. Backwards are considered all the migrations that the first underscore after the digits is followed by backwards_.

usage: punch migrate [-h] [-H HOST] [-P PORT] [-d DBNAME] [-u USER]
                     [-p PASSWORD] [-s SETTINGS] [-D] [-f] [-b] [-y]
                     [migration]

positional arguments:
  migration                        The target migration number. If unspecified,
                                   punch will migrate to latest one

optional arguments:
  -h, --help                       Show this help message and exit
  -H HOST, --host HOST             The postgres host
  -P PORT, --port PORT             The postgres port
  -d DBNAME, --dbname DBNAME       The postgres database
  -u USER, --user USER             The postgres user
  -p PASSWORD, --password PASSWORD The user's password
  -s SETTINGS, --settings SETTINGS The path to the settings file
  -D, --drop                       Drop the existing db and create a new one
  -f, --fake                       Fake the migrations up to the specified one
  -b, --backwards                  Backwards migration
  -y, --yes                        Run in non-interactive mode

Test

Testing will create a database named test_<dbname>, run all the migrations to this database, run the tests in the test directory, and produce a report. An exit code 1 is returned if any assertion fails.

usage: punch test [-h] [-H HOST] [-P PORT] [-d DBNAME] [-u USER] [-p PASSWORD]
                  [-s SETTINGS]

optional arguments:
  -h, --help                       Show this help message and exit
  -H HOST, --host HOST             The postgres host
  -P PORT, --port PORT             The postgres port
  -d DBNAME, --dbname DBNAME       The postgres database
  -u USER, --user USER             The postgres user
  -p PASSWORD, --password PASSWORD The user's password
  -s SETTINGS, --settings SETTINGS The path to the settings file

Writing a migration

In order to write a migration you just have to write an sql file:

-- /path/to/0001_initial_migration.sql
CREATE TABLE users(
    user_id  INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
    username TEXT,
    password TEXT
);

You can also specify a backwards migration

-- /path/to/0001_backwards_initial_migration.sql
DROP TABLE users;

Writing a test

In order to write a migration you just have to write an PL/pgSQL function in an sql file which returns the result of unittest.result();. You can make assertions by calling unittest.assert. The function should be in the unittest schema.

-- /path/to/test_name.sql
CREATE FUNCTION unittest.bar()
     RETURNS unittest.test_result
    LANGUAGE plpgsql
AS
$$
DECLARE
   _cnt INT;
BEGIN
    INSERT
      INTO users (username, password)
    VALUES ('user', 'hashed_and_salted_password');

    SELECT count(*)
      FROM users
      INTO _cnt;

    PERFORM unittest.assert(_cnt <> 0, 'No user was created!');

    RETURN unittest.result();
END
$$;

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