Persist servers in separate database

migrations/alembic.ini

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+[alembic]
+
+[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

migrations/env.py

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+from __future__ import with_statement
+
+import logging
+from logging.config import fileConfig
+
+from flask import current_app
+
+from alembic import context
+
+
+config = context.config
+
+fileConfig(config.config_file_name)
+logger = logging.getLogger('alembic.env')
+
+config.set_main_option(
+    'sqlalchemy.url',
+    str(current_app.extensions['migrate'].db.get_engine().url).replace('%', '%%'))
+target_metadata = current_app.extensions['migrate'].db.metadata
+
+
+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()

migrations/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date.date()}
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+	${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+	${downgrades if downgrades else "pass"}

migrations/versions/00ac5d537063_initial_migration.py

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+"""Initial migration
+
+Revision ID: 00ac5d537063
+Create Date: 2021-06-12
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = '00ac5d537063'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+	op.create_table('server',
+		sa.Column('id', sa.Integer(), nullable=False),
+		sa.Column('world_uuid', sa.String(length=36), nullable=True),
+		sa.Column('online', sa.Boolean(), nullable=False),
+		sa.Column('address', sa.String(), nullable=False),
+		sa.Column('port', sa.Integer(), nullable=False),
+		sa.Column('announce_ip', sa.String(), nullable=False),
+		sa.Column('server_id', sa.String(), nullable=True),
+		sa.Column('clients', sa.String(), nullable=True),
+		sa.Column('clients_top', sa.Integer(), nullable=False),
+		sa.Column('clients_max', sa.Integer(), nullable=False),
+		sa.Column('first_seen', sa.DateTime(), nullable=False),
+		sa.Column('start_time', sa.DateTime(), nullable=False),
+		sa.Column('last_update', sa.DateTime(), nullable=False),
+		sa.Column('total_uptime', sa.Float(), nullable=False),
+		sa.Column('down_time', sa.DateTime(), nullable=True),
+		sa.Column('game_time', sa.Integer(), nullable=False),
+		sa.Column('lag', sa.Float(), nullable=True),
+		sa.Column('ping', sa.Float(), nullable=False),
+		sa.Column('mods', sa.String(), nullable=True),
+		sa.Column('version', sa.String(), nullable=False),
+		sa.Column('proto_min', sa.Integer(), nullable=False),
+		sa.Column('proto_max', sa.Integer(), nullable=False),
+		sa.Column('game_id', sa.String(), nullable=False),
+		sa.Column('mapgen', sa.String(), nullable=True),
+		sa.Column('url', sa.String(), nullable=True),
+		sa.Column('default_privs', sa.String(), nullable=True),
+		sa.Column('name', sa.String(), nullable=False),
+		sa.Column('description', sa.String(), nullable=False),
+		sa.Column('popularity', sa.Float(), nullable=False),
+		sa.Column('geo_continent', sa.String(length=2), nullable=True),
+		sa.Column('creative', sa.Boolean(), nullable=False),
+		sa.Column('is_dedicated', sa.Boolean(), nullable=False),
+		sa.Column('damage_enabled', sa.Boolean(), nullable=False),
+		sa.Column('pvp_enabled', sa.Boolean(), nullable=False),
+		sa.Column('password_required', sa.Boolean(), nullable=False),
+		sa.Column('rollback_enabled', sa.Boolean(), nullable=False),
+		sa.Column('can_see_far_names', sa.Boolean(), nullable=False),
+		sa.PrimaryKeyConstraint('id')
+	)
+	op.create_index('ix_server_address_port', 'server', ['address', 'port'], unique=True)
+	op.create_index(op.f('ix_server_online'), 'server', ['online'], unique=False)
+	op.create_index(op.f('ix_server_world_uuid'), 'server', ['world_uuid'], unique=True)
+	op.create_table('stats',
+		sa.Column('id', sa.Integer(), nullable=False),
+		sa.Column('max_servers', sa.Integer(), nullable=False),
+		sa.Column('max_clients', sa.Integer(), nullable=False),
+		sa.PrimaryKeyConstraint('id')
+	)
+
+
+def downgrade():
+	op.drop_table('stats')
+	op.drop_index(op.f('ix_server_world_uuid'), table_name='server')
+	op.drop_index(op.f('ix_server_online'), table_name='server')
+	op.drop_index('ix_server_address_port', table_name='server')
+	op.drop_table('server')