30fd8253d87f_kvstore_compress.py

"""Compression of KVStore

Revision ID: 30fd8253d87f
Revises: 1604623c481a
Create Date: 2020-08-30 10:11:57.574292

"""
from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import postgresql

# revision identifiers, used by Alembic.
revision = '30fd8253d87f'
down_revision = '1604623c481a'
branch_labels = None
depends_on = None


def upgrade():
    # Appears there is an alembic issue with autogenerating enums:
    #https://github.com/sqlalchemy/alembic/issues/278

    compression_enum = postgresql.ENUM('none', 'gzip', 'bzip2', 'lzma', name='compressionenum')
    compression_enum.create(op.get_bind())

    # ### commands auto generated by Alembic - please adjust! ###
    op.add_column('kv_store', sa.Column('compression', compression_enum, nullable=True))
    op.add_column('kv_store', sa.Column('compression_level', sa.Integer(), nullable=True))
    op.add_column('kv_store', sa.Column('data', sa.LargeBinary(), nullable=True))
    op.alter_column('kv_store', 'value',
               existing_type=postgresql.JSON(astext_type=sa.Text()),
               nullable=True)
    # ### end Alembic commands ###


def downgrade():
    # ### commands auto generated by Alembic - please adjust! ###
    op.alter_column('kv_store', 'value',
               existing_type=postgresql.JSON(astext_type=sa.Text()),
               nullable=False)
    op.drop_column('kv_store', 'data')
    op.drop_column('kv_store', 'compression_level')
    op.drop_column('kv_store', 'compression')
    op.execute("DROP TYPE compressionenum")
    # ### end Alembic commands ###