postgresql/contrib/pg_upgrade/function.c

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/*
* function.c
*
* server-side function support
*/
#include "pg_upgrade.h"
#include "access/transam.h"
/*
* install_support_functions()
*
* pg_upgrade requires some support functions that enable it to modify
* backend behavior.
*/
void
install_support_functions(migratorContext *ctx)
{
int dbnum;
prep_status(ctx, "Adding support functions to new cluster");
for (dbnum = 0; dbnum < ctx->new.dbarr.ndbs; dbnum++)
{
DbInfo *newdb = &ctx->new.dbarr.dbs[dbnum];
PGconn *conn = connectToServer(ctx, newdb->db_name, CLUSTER_NEW);
/* suppress NOTICE of dropped objects */
PQclear(executeQueryOrDie(ctx, conn,
"SET client_min_messages = warning;"));
PQclear(executeQueryOrDie(ctx, conn,
"DROP SCHEMA IF EXISTS binary_upgrade CASCADE;"));
PQclear(executeQueryOrDie(ctx, conn,
"RESET client_min_messages;"));
PQclear(executeQueryOrDie(ctx, conn,
"CREATE SCHEMA binary_upgrade;"));
PQclear(executeQueryOrDie(ctx, conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.set_next_pg_type_oid(OID) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_sysoids' "
"LANGUAGE C STRICT;"));
PQclear(executeQueryOrDie(ctx, conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.set_next_pg_type_array_oid(OID) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_sysoids' "
"LANGUAGE C STRICT;"));
PQclear(executeQueryOrDie(ctx, conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.set_next_pg_type_toast_oid(OID) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_sysoids' "
"LANGUAGE C STRICT;"));
PQclear(executeQueryOrDie(ctx, conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.set_next_heap_relfilenode(OID) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_sysoids' "
"LANGUAGE C STRICT;"));
PQclear(executeQueryOrDie(ctx, conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.set_next_toast_relfilenode(OID) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_sysoids' "
"LANGUAGE C STRICT;"));
PQclear(executeQueryOrDie(ctx, conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.set_next_index_relfilenode(OID) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_sysoids' "
"LANGUAGE C STRICT;"));
PQclear(executeQueryOrDie(ctx, conn,
"CREATE OR REPLACE FUNCTION "
" binary_upgrade.add_pg_enum_label(OID, OID, NAME) "
"RETURNS VOID "
"AS '$libdir/pg_upgrade_sysoids' "
"LANGUAGE C STRICT;"));
PQfinish(conn);
}
check_ok(ctx);
}
void
uninstall_support_functions(migratorContext *ctx)
{
int dbnum;
prep_status(ctx, "Removing support functions from new cluster");
for (dbnum = 0; dbnum < ctx->new.dbarr.ndbs; dbnum++)
{
DbInfo *newdb = &ctx->new.dbarr.dbs[dbnum];
PGconn *conn = connectToServer(ctx, newdb->db_name, CLUSTER_NEW);
/* suppress NOTICE of dropped objects */
PQclear(executeQueryOrDie(ctx, conn,
"SET client_min_messages = warning;"));
PQclear(executeQueryOrDie(ctx, conn,
"DROP SCHEMA binary_upgrade CASCADE;"));
PQclear(executeQueryOrDie(ctx, conn,
"RESET client_min_messages;"));
PQfinish(conn);
}
check_ok(ctx);
}
/*
* get_loadable_libraries()
*
* Fetch the names of all old libraries containing C-language functions.
* We will later check that they all exist in the new installation.
*/
void
get_loadable_libraries(migratorContext *ctx)
{
ClusterInfo *active_cluster = &ctx->old;
PGresult **ress;
int totaltups;
int dbnum;
ress = (PGresult **)
pg_malloc(ctx, active_cluster->dbarr.ndbs * sizeof(PGresult *));
totaltups = 0;
/* Fetch all library names, removing duplicates within each DB */
for (dbnum = 0; dbnum < active_cluster->dbarr.ndbs; dbnum++)
{
DbInfo *active_db = &active_cluster->dbarr.dbs[dbnum];
PGconn *conn = connectToServer(ctx, active_db->db_name, CLUSTER_OLD);
/* Fetch all libraries referenced in this DB */
ress[dbnum] = executeQueryOrDie(ctx, conn,
"SELECT DISTINCT probin "
"FROM pg_catalog.pg_proc "
"WHERE prolang = 13 /* C */ AND "
" probin IS NOT NULL AND "
" oid >= %u;",
FirstNormalObjectId);
totaltups += PQntuples(ress[dbnum]);
PQfinish(conn);
}
/* Allocate what's certainly enough space */
if (totaltups > 0)
ctx->libraries = (char **) pg_malloc(ctx, totaltups * sizeof(char *));
else
ctx->libraries = NULL;
/*
* Now remove duplicates across DBs. This is pretty inefficient code, but
* there probably aren't enough entries to matter.
*/
totaltups = 0;
for (dbnum = 0; dbnum < active_cluster->dbarr.ndbs; dbnum++)
{
PGresult *res = ress[dbnum];
int ntups;
int rowno;
ntups = PQntuples(res);
for (rowno = 0; rowno < ntups; rowno++)
{
char *lib = PQgetvalue(res, rowno, 0);
bool dup = false;
int n;
for (n = 0; n < totaltups; n++)
{
if (strcmp(lib, ctx->libraries[n]) == 0)
{
dup = true;
break;
}
}
if (!dup)
ctx->libraries[totaltups++] = pg_strdup(ctx, lib);
}
PQclear(res);
}
ctx->num_libraries = totaltups;
pg_free(ress);
}
/*
* check_loadable_libraries()
*
* Check that the new cluster contains all required libraries.
* We do this by actually trying to LOAD each one, thereby testing
* compatibility as well as presence.
*/
void
check_loadable_libraries(migratorContext *ctx)
{
PGconn *conn = connectToServer(ctx, "template1", CLUSTER_NEW);
int libnum;
FILE *script = NULL;
bool found = false;
char output_path[MAXPGPATH];
prep_status(ctx, "Checking for presence of required libraries");
snprintf(output_path, sizeof(output_path), "%s/loadable_libraries.txt",
ctx->output_dir);
for (libnum = 0; libnum < ctx->num_libraries; libnum++)
{
char *lib = ctx->libraries[libnum];
int llen = strlen(lib);
char *cmd = (char *) pg_malloc(ctx, 8 + 2 * llen + 1);
PGresult *res;
strcpy(cmd, "LOAD '");
PQescapeStringConn(conn, cmd + 6, lib, llen, NULL);
strcat(cmd, "'");
res = PQexec(conn, cmd);
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
found = true;
if (script == NULL && (script = fopen(output_path, "w")) == NULL)
pg_log(ctx, PG_FATAL, "Could not create necessary file: %s\n",
output_path);
fprintf(script, "Failed to load library: %s\n%s\n",
lib,
PQerrorMessage(conn));
}
PQclear(res);
pg_free(cmd);
}
PQfinish(conn);
if (found)
{
fclose(script);
pg_log(ctx, PG_REPORT, "fatal\n");
pg_log(ctx, PG_FATAL,
"| Your installation uses loadable libraries that are missing\n"
"| from the new installation. You can add these libraries to\n"
"| the new installation, or remove the functions using them\n"
"| from the old installation. A list of the problem libraries\n"
"| is in the file\n"
"| \"%s\".\n\n", output_path);
}
else
check_ok(ctx);
}