Mercurial > libervia-backend

annotate sat/memory/migration/versions/79e5f3313fa4_create_table_for_pubsub_subscriptions.py @ 3744:658ddbabaf36

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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. rel 364
author Goffi <goffi@goffi.org>
date Tue, 22 Mar 2022 17:00:42 +0100
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3744
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1 """create table for pubsub subscriptions
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2
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3 Revision ID: 79e5f3313fa4
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4 Revises: 129ac51807e4
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5 Create Date: 2022-03-14 17:15:00.689871
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6
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7 """
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8 from alembic import op
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9 import sqlalchemy as sa
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10 from sat.memory.sqla_mapping import JID
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12
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13 # revision identifiers, used by Alembic.
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14 revision = '79e5f3313fa4'
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15 down_revision = '129ac51807e4'
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16 branch_labels = None
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17 depends_on = None
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20 def upgrade():
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21 op.create_table('pubsub_subs',
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22 sa.Column('id', sa.Integer(), nullable=False),
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23 sa.Column('node_id', sa.Integer(), nullable=False),
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24 sa.Column('subscriber', JID(), nullable=True),
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25 sa.Column('state', sa.Enum('SUBSCRIBED', 'PENDING', name='state'), nullable=True),
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26 sa.ForeignKeyConstraint(['node_id'], ['pubsub_nodes.id'], name=op.f('fk_pubsub_subs_node_id_pubsub_nodes'), ondelete='CASCADE'),
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27 sa.PrimaryKeyConstraint('id', name=op.f('pk_pubsub_subs')),
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28 sa.UniqueConstraint('node_id', 'subscriber', name=op.f('uq_pubsub_subs_node_id'))
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29 )
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30
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31
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32 def downgrade():
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33 op.drop_table('pubsub_subs')