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import sqlalchemy
from sqlalchemy.dialects import mysql
from sqlalchemy import types as sqltypes


def upgrade(migrate_engine):
    if migrate_engine.name != 'mysql':
        return

    meta = sqlalchemy.MetaData(bind=migrate_engine)

    stack = sqlalchemy.Table('stack', meta, autoload=True)
    stack.c.parameters.alter(type=mysql.LONGTEXT())

    resource = sqlalchemy.Table('resource', meta, autoload=True)
    resource.c.rsrc_metadata.alter(type=mysql.LONGTEXT())

    watch_rule = sqlalchemy.Table('watch_rule', meta, autoload=True)
    watch_rule.c.rule.alter(type=mysql.LONGTEXT())

    watch_data = sqlalchemy.Table('watch_data', meta, autoload=True)
    watch_data.c.data.alter(type=mysql.LONGTEXT())


def downgrade(migrate_engine):
    if migrate_engine.name != 'mysql':
        return

    meta = sqlalchemy.MetaData(bind=migrate_engine)

    stack = sqlalchemy.Table('stack', meta, autoload=True)
    stack.c.parameters.alter(type=sqltypes.TEXT())

    resource = sqlalchemy.Table('resource', meta, autoload=True)
    resource.c.rsrc_metadata.alter(type=sqltypes.TEXT())

    watch_rule = sqlalchemy.Table('watch_rule', meta, autoload=True)
    watch_rule.c.rule.alter(type=sqltypes.TEXT())

    watch_data = sqlalchemy.Table('watch_data', meta, autoload=True)
    watch_data.c.data.alter(type=sqltypes.TEXT())

Migrate remaining TEXT columns to LONGTEXT
Migrate remaining TEXT columns to LONGTEXT

To avoid cases where mysql silently truncates json data
when it is > 2^16 bytes, migrate all remaining TEXT columns
to LONGTEXT, in a similar way to the fix for bug #1210799

Combined with the fix for bug #1215501 which limits the request
body size, we should never truncate, even if mysql is configured
such that it can happen

Fixes bug #1223029

Change-Id: Ib536cfa8e2952a5e047cd8573288cdd9fee0622c
