52798ad97bdf_add_pjsip_identify_by_header.py

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"""add pjsip identify by header

Revision ID: 52798ad97bdf
Revises: e2f04d309071
Create Date: 2018-01-08 12:16:02.782277

"""

# revision identifiers, used by Alembic.
revision = '52798ad97bdf'
down_revision = 'e2f04d309071'

from alembic import op
import sqlalchemy as sa


def column_upgrade(table_name, column_name, enum_name):
 if op.get_context().bind.dialect.name != 'postgresql':
 if op.get_context().bind.dialect.name == 'mssql':
 op.drop_constraint('ck_ps_endpoints_identify_by_pjsip_identify_by_values',
 table_name)
 op.alter_column(table_name, column_name, type_=sa.String(80))
 return

 # Postgres requires a few more steps
 op.execute('ALTER TABLE ' + table_name + ' ALTER COLUMN ' + column_name +
 ' TYPE varchar(80) USING identify_by::text::' + enum_name)

 op.execute('DROP TYPE ' + enum_name)


def column_downgrade(table_name, column_name, enum_name, enum_values):
 if op.get_context().bind.dialect.name != 'postgresql':
 op.alter_column(table_name, column_name,
 type_=sa.Enum(*enum_values, name=enum_name))
 return

 # Postgres requires a few more steps
 updated = sa.Enum(*enum_values, name=enum_name)
 updated.create(op.get_bind(), checkfirst=False)

 op.execute('ALTER TABLE ' + table_name + ' ALTER COLUMN ' + column_name +
 ' TYPE ' + enum_name + ' USING identify_by::text::' + enum_name)


def upgrade():
 # The ps_endpoints identify_by column has always been a comma separated
 # list of enum values. This is better represented as a string anyway to
 # avoid database compatibility issues. Also future changes are likely
 # to allow loadable endpoint identifier names and negating fixed enum
 # benefits.
 column_upgrade('ps_endpoints', 'identify_by', 'pjsip_identify_by_values')


def downgrade():
 column_downgrade('ps_endpoints', 'identify_by', 'pjsip_identify_by_values',
 ['username', 'auth_username', 'ip'])