[taler-exchange] 06/15: more work on SQL refactoring

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grothoff pushed a commit to branch master
in repository exchange.

commit 85ce53a49b23fd651b07cea9b39fa0a830b3c9a0
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Sun Nov 27 14:50:49 2022 +0100

    more work on SQL refactoring
---
 src/exchangedb/0002-purse_merges.sql  | 102 +++++++++++++++++++++++++++-------
 src/exchangedb/exchange-0001-part.sql |  20 -------
 2 files changed, 83 insertions(+), 39 deletions(-)

diff --git a/src/exchangedb/0002-purse_merges.sql 
b/src/exchangedb/0002-purse_merges.sql
index 08d7ca5f..f7b9b7d6 100644
--- a/src/exchangedb/0002-purse_merges.sql
+++ b/src/exchangedb/0002-purse_merges.sql
@@ -14,7 +14,7 @@
 -- TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 --
 
-CREATE OR REPLACE FUNCTION create_table_purse_merges(
+CREATE FUNCTION create_table_purse_merges(
   IN shard_suffix VARCHAR DEFAULT NULL
 )
 RETURNS VOID
@@ -23,27 +23,72 @@ AS $$
 DECLARE
   table_name VARCHAR DEFAULT 'purse_merges';
 BEGIN
-
   PERFORM create_partitioned_table(
-    'CREATE TABLE IF NOT EXISTS %I '
-      '(purse_merge_request_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY 
'-- UNIQUE
-      ',partner_serial_id INT8' -- REFERENCES partners(partner_serial_id) ON 
DELETE CASCADE
-      ',reserve_pub BYTEA NOT NULL CHECK(length(reserve_pub)=32)'--REFERENCES 
reserves (reserve_pub) ON DELETE CASCADE
-      ',purse_pub BYTEA NOT NULL CHECK (LENGTH(purse_pub)=32)' --REFERENCES 
purse_requests (purse_pub) ON DELETE CASCADE
-      ',merge_sig BYTEA NOT NULL CHECK (LENGTH(merge_sig)=64)'
-      ',merge_timestamp INT8 NOT NULL'
-      ',PRIMARY KEY (purse_pub)'
+    'CREATE TABLE %I '
+    '(purse_merge_request_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY'
+    ',partner_serial_id INT8'
+    ',reserve_pub BYTEA NOT NULL CHECK(length(reserve_pub)=32)'
+    ',purse_pub BYTEA NOT NULL CHECK (LENGTH(purse_pub)=32)'
+    ',merge_sig BYTEA NOT NULL CHECK (LENGTH(merge_sig)=64)'
+    ',merge_timestamp INT8 NOT NULL'
+    ',PRIMARY KEY (purse_pub)'
     ') %s ;'
     ,table_name
     ,'PARTITION BY HASH (purse_pub)'
     ,shard_suffix
   );
+  PERFORM comment_partitioned_table(
+     'Merge requests where a purse-owner requested merging the purse into the 
account'
+    ,table_name
+    ,shard_suffix
+  );
+  PERFORM comment_partitioned_column(
+     'identifies the partner exchange, NULL in case the target reserve lives 
at this exchange'
+    ,'partner_serial_id'
+    ,table_name
+    ,shard_suffix
+  );
+  PERFORM comment_partitioned_column(
+     'public key of the target reserve'
+    ,'reserve_pub'
+    ,table_name
+    ,shard_suffix
+  );
+  PERFORM comment_partitioned_column(
+     'public key of the purse'
+    ,'purse_pub'
+    ,table_name
+    ,shard_suffix
+  );
+  PERFORM comment_partitioned_column(
+     'signature by the purse private key affirming the merge, of type 
TALER_SIGNATURE_WALLET_PURSE_MERGE'
+    ,'merge_sig'
+    ,table_name
+    ,shard_suffix
+  );
+  PERFORM comment_partitioned_column(
+     'when was the merge message signed'
+    ,'merge_timestamp'
+    ,table_name
+    ,shard_suffix
+  );
+END
+$$;
 
-  table_name = concat_ws('_', table_name, shard_suffix);
 
+CREATE FUNCTION constrain_table_purse_merges(
+  IN partition_suffix VARCHAR
+)
+RETURNS VOID
+LANGUAGE plpgsql
+AS $$
+DECLARE
+  table_name VARCHAR DEFAULT 'purse_merges';
+BEGIN
+  table_name = concat_ws('_', table_name, shard_suffix);
   -- FIXME: change to materialized index by reserve_pub!
   EXECUTE FORMAT (
-    'CREATE INDEX IF NOT EXISTS ' || table_name || '_reserve_pub '
+    'CREATE INDEX ' || table_name || '_reserve_pub '
     'ON ' || table_name || ' '
     '(reserve_pub);'
   );
@@ -51,21 +96,30 @@ BEGIN
     'COMMENT ON INDEX ' || table_name || '_reserve_pub '
     'IS ' || quote_literal('needed in reserve history computation') || ';'
   );
-
+  EXECUTE FORMAT (
+    'ALTER TABLE ' || table_name ||
+    ' ADD CONSTRAINT ' || table_name || '_purse_merge_request_serial_id_key'
+    ' UNIQUE (purse_merge_request_serial_id) '
+  );
 END
 $$;
 
-CREATE OR REPLACE FUNCTION add_constraints_to_purse_merges_partition(
-  IN partition_suffix VARCHAR
-)
+
+CREATE FUNCTION foreign_table_purse_merges()
 RETURNS VOID
 LANGUAGE plpgsql
 AS $$
+DECLARE
+  table_name VARCHAR DEFAULT 'purse_merges';
 BEGIN
   EXECUTE FORMAT (
-    'ALTER TABLE purse_merges_' || partition_suffix || ' '
-      'ADD CONSTRAINT purse_merges_' || partition_suffix || 
'_purse_merge_request_serial_id_key '
-        'UNIQUE (purse_merge_request_serial_id) '
+    'ALTER TABLE ' || table_name ||
+    ' ADD CONSTRAINT ' || table_name || '_foreign_partner_serial_id'
+    ' REFERENCES partners(partner_serial_id) ON DELETE CASCADE'
+    ',ADD CONSTRAINT ' || table_name || '_foreign_reserve_pub'
+    ' REFERENCES reserves (reserve_pub) ON DELETE CASCADE'
+    ',ADD CONSTRAINT ' || table_name || '_foreign_purse_pub'
+    ' REFERENCES purse_requests (purse_pub) ON DELETE CASCADE'
   );
 END
 $$;
@@ -82,4 +136,14 @@ INSERT INTO exchange_tables
     ,'exchange-0002'
     ,'create'
     ,TRUE
+    ,FALSE),
+    ('purse_merges'
+    ,'exchange-0002'
+    ,'constrain'
+    ,TRUE
+    ,FALSE),
+    ('purse_merges'
+    ,'exchange-0002'
+    ,'foreign'
+    ,TRUE
     ,FALSE);
diff --git a/src/exchangedb/exchange-0001-part.sql 
b/src/exchangedb/exchange-0001-part.sql
index 85f6c3e7..9e6fc7c4 100644
--- a/src/exchangedb/exchange-0001-part.sql
+++ b/src/exchangedb/exchange-0001-part.sql
@@ -14,26 +14,6 @@
 -- TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 --
 
--- ------------------------------ purse_merges 
----------------------------------------
-
-SELECT create_table_purse_merges();
-
-COMMENT ON TABLE purse_merges
-  IS 'Merge requests where a purse-owner requested merging the purse into the 
account';
-COMMENT ON COLUMN purse_merges.partner_serial_id
-  IS 'identifies the partner exchange, NULL in case the target reserve lives 
at this exchange';
-COMMENT ON COLUMN purse_merges.reserve_pub
-  IS 'public key of the target reserve';
-COMMENT ON COLUMN purse_merges.purse_pub
-  IS 'public key of the purse';
-COMMENT ON COLUMN purse_merges.merge_sig
-  IS 'signature by the purse private key affirming the merge, of type 
TALER_SIGNATURE_WALLET_PURSE_MERGE';
-COMMENT ON COLUMN purse_merges.merge_timestamp
-  IS 'when was the merge message signed';
-
-SELECT add_constraints_to_purse_merges_partition('default');
-
-
 -- ------------------------------ account_merges 
----------------------------------------
 
 SELECT create_table_account_merges();

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