This patch contains repack_cleanup_callback() which calls to repack_drop() for cleaning temporary objects. repack_cleanup_callback() will be pushed on stack using pgut_atexit_push() at beginning so that it will pop on abort or exit of program.

This patch includes one global counter (temp_obj_num) which counts number of temporary objects created by pg_repack. Correct order of deletion of temporary object as per count avoids unintentional error messages.

bin/pg_repack.c

@@ -204,6 +204,7 @@ static void repack_one_table(repack_table *table, const char *order_by);
 static bool repack_table_indexes(PGresult *index_details);
 static bool repack_all_indexes(char *errbuf, size_t errsize);
 static void repack_cleanup(bool fatal, const repack_table *table);
+static void repack_cleanup_callback(bool fatal, void *userdata);
 static bool rebuild_indexes(const repack_table *table);
 
 static char *getstr(PGresult *res, int row, int col);
@@ -235,13 +236,14 @@ static bool				only_indexes = false;
 static int				wait_timeout = 60;	/* in seconds */
 static int				jobs = 0;	/* number of concurrent worker conns. */
 static bool				dryrun = false;
+static unsigned int		temp_obj_num = 0; /* temporary objects counter */
 
 /* buffer should have at least 11 bytes */
 static char *
 utoa(unsigned int value, char *buffer)
 {
 	sprintf(buffer, "%u", value);
-	return buffer;
+	return strdup(buffer);
 }
 
 static pgut_option options[] =
@@ -990,7 +992,7 @@ static void
 repack_one_table(repack_table *table, const char *orderby)
 {
 	PGresult	   *res = NULL;
-	const char	   *params[2];
+	const char	   *params[3];
 	int				num;
 	char		   *vxid = NULL;
 	char			buffer[12];
@@ -1041,6 +1043,9 @@ repack_one_table(repack_table *table, const char *orderby)
 
 	if (dryrun)
 		return;
+	
+	/* push repack_cleanup_callback() on stack to clean temporary objects */
+	pgut_atexit_push(repack_cleanup_callback, &table->target_oid);
 
 	/*
 	 * 1. Setup advisory lock and trigger on main table.
@@ -1146,8 +1151,11 @@ repack_one_table(repack_table *table, const char *orderby)
 	CLEARPGRES(res);
 
 	command(table->create_pktype, 0, NULL);
+	temp_obj_num++;
 	command(table->create_log, 0, NULL);
+	temp_obj_num++;
 	command(table->create_trigger, 0, NULL);
+	temp_obj_num++;
 	command(table->enable_trigger, 0, NULL);
 	printfStringInfo(&sql, "SELECT repack.disable_autovacuum('repack.log_%u')", table->target_oid);
 	command(sql.data, 0, NULL);
@@ -1287,6 +1295,7 @@ repack_one_table(repack_table *table, const char *orderby)
 		goto cleanup;
 
 	command(table->create_table, 0, NULL);
+	temp_obj_num++;
 	printfStringInfo(&sql, "SELECT repack.disable_autovacuum('repack.table_%u')", table->target_oid);
 	if (table->drop_columns)
 		command(table->drop_columns, 0, NULL);
@@ -1379,7 +1388,8 @@ repack_one_table(repack_table *table, const char *orderby)
 	elog(DEBUG2, "---- drop ----");
 
 	command("BEGIN ISOLATION LEVEL READ COMMITTED", 0, NULL);
-	command("SELECT repack.repack_drop($1)", 1, params);
+	params[1] = utoa(temp_obj_num, buffer);
+	command("SELECT repack.repack_drop($1, $2)", 2, params);
 	command("COMMIT", 0, NULL);
 
 	/*
@@ -1399,7 +1409,7 @@ repack_one_table(repack_table *table, const char *orderby)
 
 	/* Release advisory lock on table. */
 	params[0] = REPACK_LOCK_PREFIX_STR;
-	params[1] = buffer;
+	params[1] = utoa(table->target_oid, buffer);
 
 	res = pgut_execute(connection, "SELECT pg_advisory_unlock($1, CAST(-2147483648 + $2::bigint AS integer))",
 			   2, params);
@@ -1679,6 +1689,26 @@ lock_exclusive(PGconn *conn, const char *relid, const char *lock_query, bool sta
 	return ret;
 }
 
+/* This function calls to repack_drop() to clean temporary objects on error
+ * in creation of temporary objects.
+ */
+void
+repack_cleanup_callback(bool fatal, void *userdata)
+{
+	Oid			target_table = *(Oid *) userdata;
+	const char *params[2];
+	char		buffer[12];
+
+	if(fatal)
+	{
+		params[0] = utoa(target_table, buffer);
+		params[1] =  utoa(temp_obj_num, buffer);
+
+		reconnect(ERROR);
+		command("SELECT repack.repack_drop($1, $2)", 2, params);
+	}
+}
+
 /*
  * The userdata pointing a table being re-organized. We need to cleanup temp
  * objects before the program exits.
@@ -1693,7 +1723,7 @@ repack_cleanup(bool fatal, const repack_table *table)
 	else
 	{
 		char		buffer[12];
-		const char *params[1];
+		const char *params[2];
 
 		/* Try reconnection if not available. */
 		if (PQstatus(connection) != CONNECTION_OK ||
@@ -1702,7 +1732,8 @@ repack_cleanup(bool fatal, const repack_table *table)
 
 		/* do cleanup */
 		params[0] = utoa(table->target_oid, buffer);
-		command("SELECT repack.repack_drop($1)", 1, params);
+		params[1] =  utoa(temp_obj_num, buffer);
+		command("SELECT repack.repack_drop($1, $2)", 2, params);
 	}
 }
 

bin/pgut/pgut.c

@@ -1180,7 +1180,9 @@ call_atexit_callbacks(bool fatal)
 	pgut_atexit_item  *item;
 
 	for (item = pgut_atexit_stack; item; item = item->next)
+	{
 		item->callback(fatal, item->userdata);
+	}
 }
 
 static void
@@ -1195,10 +1197,11 @@ on_cleanup(void)
 static void
 exit_or_abort(int exitcode)
 {
+	call_atexit_callbacks(true);
 	if (in_cleanup)
 	{
 		/* oops, error in cleanup*/
-		call_atexit_callbacks(true);
+		in_cleanup = false;
 		abort();
 	}
 	else

lib/pg_repack.sql.in

@@ -247,7 +247,7 @@ CREATE FUNCTION repack.repack_swap(oid) RETURNS void AS
 'MODULE_PATHNAME', 'repack_swap'
 LANGUAGE C VOLATILE STRICT;
 
-CREATE FUNCTION repack.repack_drop(oid) RETURNS void AS
+CREATE FUNCTION repack.repack_drop(oid, int) RETURNS void AS
 'MODULE_PATHNAME', 'repack_drop'
 LANGUAGE C VOLATILE STRICT;
 

lib/repack.c

@@ -928,6 +928,7 @@ Datum
 repack_drop(PG_FUNCTION_ARGS)
 {
 	Oid			oid = PG_GETARG_OID(0);
+	int			numobj = PG_GETARG_INT32(1);
 	const char *relname = get_quoted_relname(oid);
 	const char *nspname = get_quoted_nspname(oid);
 
@@ -943,14 +944,38 @@ repack_drop(PG_FUNCTION_ARGS)
 	/* connect to SPI manager */
 	repack_init();
 
+	/* drop log table */
+	if(numobj > 0)
+	{
+		execute_with_format(
+			SPI_OK_UTILITY,
+			"DROP TABLE IF EXISTS repack.log_%u CASCADE",
+			oid);
+		--numobj;
+	}
+
+	/* drop type for pk type */
+	if(numobj > 0)
+	{
+		execute_with_format(
+			SPI_OK_UTILITY,
+			"DROP TYPE IF EXISTS repack.pk_%u",
+			oid);
+		--numobj;
+	}
+
 	/*
 	 * drop repack trigger: We have already dropped the trigger in normal
 	 * cases, but it can be left on error.
 	 */
-	execute_with_format(
-		SPI_OK_UTILITY,
-		"DROP TRIGGER IF EXISTS z_repack_trigger ON %s.%s CASCADE",
-		nspname, relname);
+	if(numobj > 0)
+	{
+		execute_with_format(
+			SPI_OK_UTILITY,
+			"DROP TRIGGER IF EXISTS z_repack_trigger ON %s.%s CASCADE",
+			nspname, relname);
+		--numobj;
+	}
 
 #if PG_VERSION_NUM < 80400
 	/* delete autovacuum settings */
@@ -965,23 +990,15 @@ repack_drop(PG_FUNCTION_ARGS)
 		oid, oid);
 #endif
 
-	/* drop log table */
-	execute_with_format(
-		SPI_OK_UTILITY,
-		"DROP TABLE IF EXISTS repack.log_%u CASCADE",
-		oid);
-
 	/* drop temp table */
-	execute_with_format(
-		SPI_OK_UTILITY,
-		"DROP TABLE IF EXISTS repack.table_%u CASCADE",
-		oid);
-
-	/* drop type for log table */
-	execute_with_format(
-		SPI_OK_UTILITY,
-		"DROP TYPE IF EXISTS repack.pk_%u CASCADE",
-		oid);
+	if(numobj > 0)
+	{
+		execute_with_format(
+			SPI_OK_UTILITY,
+			"DROP TABLE IF EXISTS repack.table_%u CASCADE",
+			oid);
+		--numobj;
+	}
 
 	SPI_finish();