Add migrations DB function (for Flask-Migrate)

Author: ncsyvn

auth_service/auth_app/migrations/alembic.ini

@@ -0,0 +1,50 @@
+# A generic, single database configuration.
+
+[alembic]
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic,flask_migrate
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[logger_flask_migrate]
+level = INFO
+handlers =
+qualname = flask_migrate
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

auth_service/auth_app/migrations/env.py

@@ -0,0 +1,89 @@
+from __future__ import with_statement
+
+import logging
+from logging.config import fileConfig
+from flask import current_app
+from alembic import context
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+logger = logging.getLogger('alembic.env')
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+config.set_main_option(
+ 'sqlalchemy.url',
+ str(current_app.extensions['migrate'].db.get_engine().url).replace(
+ '%', '%%'))
+target_metadata = current_app.extensions['migrate'].db.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline():
+ """Run migrations in 'offline' mode.
+
+ This configures the context with just a URL
+ and not an Engine, though an Engine is acceptable
+ here as well. By skipping the Engine creation
+ we don't even need a DBAPI to be available.
+
+ Calls to context.execute() here emit the given string to the
+ script output.
+
+ """
+ url = config.get_main_option("sqlalchemy.url")
+ context.configure(
+ url=url, target_metadata=target_metadata, literal_binds=True
+ )
+
+ with context.begin_transaction():
+ context.run_migrations()
+
+
+def run_migrations_online():
+ """Run migrations in 'online' mode.
+
+ In this scenario we need to create an Engine
+ and associate a connection with the context.
+
+ """
+
+ # this callback is used to prevent an auto-migration from being generated
+ # when there are no changes to the schema
+ # reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html
+ def process_revision_directives(context, revision, directives):
+ if getattr(config.cmd_opts, 'autogenerate', False):
+ script = directives[0]
+ if script.upgrade_ops.is_empty():
+ directives[:] = []
+ logger.info('No changes in schema detected.')
+
+ connectable = current_app.extensions['migrate'].db.get_engine()
+
+ with connectable.connect() as connection:
+ context.configure(
+ connection=connection,
+ target_metadata=target_metadata,
+ process_revision_directives=process_revision_directives,
+ **current_app.extensions['migrate'].configure_args
+ )
+
+ with context.begin_transaction():
+ context.run_migrations()
+
+
+if context.is_offline_mode():
+ run_migrations_offline()
+else:
+ run_migrations_online()

auth_service/requirements.txt

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+Flask==2.0.1
+Flask-And-Redis==1.0.0
+Flask-Cors==3.0.10
+Flask-JWT-Extended==3.24.1
+Flask-SQLAlchemy==2.5.1
+gunicorn==20.1.0
+Jinja2==3.0.1
+marshmallow==3.12.2
+greenlet==1.1.0
+SQLAlchemy==1.4.21
+Flask-Migrate==3.1.0
+mysqlclient==2.0.3

auth_service/server.py

@@ -0,0 +1,9 @@
+from auth_app.app import create_app
+
+app = create_app()
+if __name__ == '__main__':
+ """
+ Main Application
+ python manage.py
+ """
+ app.run(host='0.0.0.0', port=5012)