20abce6d1e3c_add_pjsip_identify_by_ip.py

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"""add pjsip identify by ip
 
Revision ID: 20abce6d1e3c
Revises: a1698e8bb9c5
Create Date: 2017-10-24 15:44:06.404774
 
"""
 
# revision identifiers, used by Alembic.
revision = '20abce6d1e3c'
down_revision = 'a1698e8bb9c5'
 
from alembic import op
import sqlalchemy as sa
 
 
def enum_update(table_name, column_name, enum_name, enum_values):
    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', 'ps_endpoints')
        op.alter_column(table_name, column_name,
                        type_=sa.Enum(*enum_values, name=enum_name))
        return
 
    # Postgres requires a few more steps
    tmp = enum_name + '_tmp'
 
    op.execute('ALTER TYPE ' + enum_name + ' RENAME TO ' + tmp)
 
    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)
 
    op.execute('DROP TYPE ' + tmp)
 
 
def upgrade():
    enum_update('ps_endpoints', 'identify_by', 'pjsip_identify_by_values',
                ['username', 'auth_username', 'ip'])
 
 
def downgrade():
    enum_update('ps_endpoints', 'identify_by', 'pjsip_identify_by_values',
                ['username', 'auth_username'])