Mercurial > libervia-backend
view sat/memory/migration/versions/79e5f3313fa4_create_table_for_pubsub_subscriptions.py @ 3744:658ddbabaf36
core (memory/sqla): new table/mapping to handle Pubsub node subscriptions:
node subscriptions can now be cached, this can be useful for components which must keep
track of subscibers.
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author | Goffi <goffi@goffi.org> |
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date | Tue, 22 Mar 2022 17:00:42 +0100 |
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"""create table for pubsub subscriptions Revision ID: 79e5f3313fa4 Revises: 129ac51807e4 Create Date: 2022-03-14 17:15:00.689871 """ from alembic import op import sqlalchemy as sa from sat.memory.sqla_mapping import JID # revision identifiers, used by Alembic. revision = '79e5f3313fa4' down_revision = '129ac51807e4' branch_labels = None depends_on = None def upgrade(): op.create_table('pubsub_subs', sa.Column('id', sa.Integer(), nullable=False), sa.Column('node_id', sa.Integer(), nullable=False), sa.Column('subscriber', JID(), nullable=True), sa.Column('state', sa.Enum('SUBSCRIBED', 'PENDING', name='state'), nullable=True), sa.ForeignKeyConstraint(['node_id'], ['pubsub_nodes.id'], name=op.f('fk_pubsub_subs_node_id_pubsub_nodes'), ondelete='CASCADE'), sa.PrimaryKeyConstraint('id', name=op.f('pk_pubsub_subs')), sa.UniqueConstraint('node_id', 'subscriber', name=op.f('uq_pubsub_subs_node_id')) ) def downgrade(): op.drop_table('pubsub_subs')