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eventstore

1.2.2
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Event store using PostgreSQL for persistence.

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eventstore priv event_store migrations v1.2.0.sql
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priv/event_store/migrations/v1.2.0.sql 

DO $migration$

BEGIN



  -- Drop no UPDATE and DELETE rules to be replaced with triggers

  DROP RULE no_update_stream_events ON stream_events;

  DROP RULE no_delete_stream_events ON stream_events;

  DROP RULE no_update_events ON events;

  DROP RULE no_delete_events ON events;



  CREATE OR REPLACE FUNCTION event_store_exception()

    RETURNS trigger AS $$

  DECLARE

    message text;

  BEGIN

    message := 'EventStore: ' || TG_ARGV[0];



    RAISE EXCEPTION USING MESSAGE = message;

  END;

  $$ LANGUAGE plpgsql;



  CREATE OR REPLACE FUNCTION event_store_delete()

    RETURNS trigger AS $$

  DECLARE

    message text;

  BEGIN

    IF current_setting('eventstore.enable_hard_deletes', true) = 'on' OR

      current_setting('eventstore.reset', true) = 'on'

    THEN

      -- Allow DELETE

      RETURN OLD;

    ELSE

      -- Prevent DELETE

      message := 'EventStore: ' || TG_ARGV[0];



      RAISE EXCEPTION USING MESSAGE = message, ERRCODE = 'feature_not_supported';

    END IF;

  END;

  $$ LANGUAGE plpgsql;



  -- Create UPDATE and DELETE triggers

  CREATE TRIGGER no_update_events

    BEFORE UPDATE ON events

    FOR EACH STATEMENT

    EXECUTE PROCEDURE event_store_exception('Cannot update events');



  CREATE TRIGGER no_delete_events

    BEFORE DELETE ON events

    FOR EACH STATEMENT

    EXECUTE PROCEDURE event_store_delete('Cannot delete events');



  CREATE TRIGGER no_update_stream_events

      BEFORE UPDATE ON stream_events

      FOR EACH STATEMENT

      EXECUTE PROCEDURE event_store_exception('Cannot update stream events');



  CREATE TRIGGER no_delete_stream_events

    BEFORE DELETE ON stream_events

    FOR EACH STATEMENT

    EXECUTE PROCEDURE event_store_delete('Cannot delete stream events');



  CREATE TRIGGER no_delete_streams

    BEFORE DELETE ON streams

    FOR EACH STATEMENT

    EXECUTE PROCEDURE event_store_delete('Cannot delete streams');



  -- Streams now require a `deleted_at` column

  ALTER TABLE streams ADD COLUMN deleted_at timestamp with time zone;



  -- Record schema migration

  INSERT INTO schema_migrations (major_version, minor_version, patch_version) VALUES (1, 2, 0);



END;

$migration$ LANGUAGE plpgsql;