include/sql/0002-purse_deletion.sql

@@ -0,0 +1,110 @@
+--
+-- This file is part of TALER
+-- Copyright (C) 2014--2022 Taler Systems SA
+--
+-- TALER is free software; you can redistribute it and/or modify it under the
+-- terms of the GNU General Public License as published by the Free Software
+-- Foundation; either version 3, or (at your option) any later version.
+--
+-- TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+-- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+-- A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License along with
+-- TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+--
+
+CREATE OR REPLACE FUNCTION create_table_purse_deletion(
+  IN partition_suffix TEXT DEFAULT NULL
+)
+RETURNS VOID
+LANGUAGE plpgsql
+AS $$
+DECLARE
+  table_name TEXT DEFAULT 'purse_deletion';
+BEGIN
+  PERFORM create_partitioned_table(
+    'CREATE TABLE IF NOT EXISTS %I'
+      '(purse_deletion_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY'
+      ',purse_sig BYTEA CHECK (LENGTH(purse_sig)=64)'
+      ',purse_pub BYTEA NOT NULL CHECK (LENGTH(purse_pub)=32)'
+    ') %s ;'
+    ,table_name
+    ,'PARTITION BY HASH (purse_pub)'
+    ,partition_suffix
+  );
+  PERFORM comment_partitioned_table(
+     'signatures affirming explicit purse deletions'
+    ,table_name
+    ,partition_suffix
+  );
+  PERFORM comment_partitioned_column(
+     'signature of type WALLET_PURSE_DELETE'
+    ,'purse_sig'
+    ,table_name
+    ,partition_suffix
+  );
+END $$;
+
+COMMENT ON FUNCTION create_table_purse_deletion
+  IS 'Creates the purse_deletion table';
+
+
+CREATE OR REPLACE FUNCTION constrain_table_purse_deletion(
+  IN partition_suffix TEXT DEFAULT NULL
+)
+RETURNS void
+LANGUAGE plpgsql
+AS $$
+DECLARE
+  table_name TEXT DEFAULT 'purse_deletion';
+BEGIN
+  table_name = concat_ws('_', table_name, partition_suffix);
+  EXECUTE FORMAT (
+    'ALTER TABLE ' || table_name ||
+      ' ADD CONSTRAINT ' || table_name || '_delete_serial_key '
+        'UNIQUE (purse_deletion_serial_id)'
+  );
+END $$;
+
+
+CREATE OR REPLACE FUNCTION master_table_purse_requests_was_deleted (
+)
+RETURNS void
+LANGUAGE plpgsql
+AS $$
+DECLARE
+  table_name TEXT DEFAULT 'purse_requests';
+BEGIN
+  EXECUTE FORMAT (
+    'ALTER TABLE exchange.' || table_name ||
+    ' ADD COLUMN'
+    ' was_deleted BOOLEAN NOT NULL DEFAULT(FALSE)'
+  );
+  COMMENT ON COLUMN purse_requests.was_deleted
+    IS 'TRUE if the purse was explicitly deleted (purse must have an entry in the purse_deletion table)';
+END $$;
+
+
+INSERT INTO exchange_tables
+    (name
+    ,version
+    ,action
+    ,partitioned
+    ,by_range)
+  VALUES
+    ('purse_deletion'
+    ,'exchange-0002'
+    ,'create'
+    ,TRUE
+    ,FALSE),
+    ('purse_deletion'
+    ,'exchange-0002'
+    ,'constrain'
+    ,TRUE
+    ,FALSE),
+    ('purse_requests_was_deleted'
+    ,'exchange-0002'
+    ,'master'
+    ,TRUE
+    ,FALSE);