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https://git.postgresql.org/git/postgresql.git
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268 lines
7.0 KiB
C
268 lines
7.0 KiB
C
/*
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* function.c
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*
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* server-side function support
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*
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* Copyright (c) 2010-2011, PostgreSQL Global Development Group
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* contrib/pg_upgrade/function.c
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*/
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#include "pg_upgrade.h"
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#include "access/transam.h"
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/*
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* install_support_functions_in_new_db()
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*
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* pg_upgrade requires some support functions that enable it to modify
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* backend behavior.
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*/
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void
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install_support_functions_in_new_db(const char *db_name)
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{
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PGconn *conn = connectToServer(&new_cluster, db_name);
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/* suppress NOTICE of dropped objects */
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PQclear(executeQueryOrDie(conn,
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"SET client_min_messages = warning;"));
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PQclear(executeQueryOrDie(conn,
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"DROP SCHEMA IF EXISTS binary_upgrade CASCADE;"));
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PQclear(executeQueryOrDie(conn,
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"RESET client_min_messages;"));
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PQclear(executeQueryOrDie(conn,
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"CREATE SCHEMA binary_upgrade;"));
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PQclear(executeQueryOrDie(conn,
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"CREATE OR REPLACE FUNCTION "
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"binary_upgrade.set_next_pg_type_oid(OID) "
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"RETURNS VOID "
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"AS '$libdir/pg_upgrade_support' "
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"LANGUAGE C STRICT;"));
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PQclear(executeQueryOrDie(conn,
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"CREATE OR REPLACE FUNCTION "
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"binary_upgrade.set_next_array_pg_type_oid(OID) "
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"RETURNS VOID "
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"AS '$libdir/pg_upgrade_support' "
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"LANGUAGE C STRICT;"));
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PQclear(executeQueryOrDie(conn,
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"CREATE OR REPLACE FUNCTION "
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"binary_upgrade.set_next_toast_pg_type_oid(OID) "
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"RETURNS VOID "
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"AS '$libdir/pg_upgrade_support' "
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"LANGUAGE C STRICT;"));
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PQclear(executeQueryOrDie(conn,
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"CREATE OR REPLACE FUNCTION "
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"binary_upgrade.set_next_heap_pg_class_oid(OID) "
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"RETURNS VOID "
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"AS '$libdir/pg_upgrade_support' "
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"LANGUAGE C STRICT;"));
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PQclear(executeQueryOrDie(conn,
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"CREATE OR REPLACE FUNCTION "
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"binary_upgrade.set_next_index_pg_class_oid(OID) "
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"RETURNS VOID "
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"AS '$libdir/pg_upgrade_support' "
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"LANGUAGE C STRICT;"));
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PQclear(executeQueryOrDie(conn,
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"CREATE OR REPLACE FUNCTION "
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"binary_upgrade.set_next_toast_pg_class_oid(OID) "
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"RETURNS VOID "
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"AS '$libdir/pg_upgrade_support' "
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"LANGUAGE C STRICT;"));
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PQclear(executeQueryOrDie(conn,
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"CREATE OR REPLACE FUNCTION "
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"binary_upgrade.set_next_pg_enum_oid(OID) "
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"RETURNS VOID "
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"AS '$libdir/pg_upgrade_support' "
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"LANGUAGE C STRICT;"));
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PQclear(executeQueryOrDie(conn,
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"CREATE OR REPLACE FUNCTION "
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"binary_upgrade.set_next_pg_authid_oid(OID) "
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"RETURNS VOID "
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"AS '$libdir/pg_upgrade_support' "
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"LANGUAGE C STRICT;"));
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PQclear(executeQueryOrDie(conn,
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"CREATE OR REPLACE FUNCTION "
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"binary_upgrade.create_empty_extension(text, text, bool, text, oid[], text[], text[]) "
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"RETURNS VOID "
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"AS '$libdir/pg_upgrade_support' "
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"LANGUAGE C;"));
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PQfinish(conn);
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}
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void
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uninstall_support_functions_from_new_cluster(void)
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{
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int dbnum;
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prep_status("Removing support functions from new cluster");
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for (dbnum = 0; dbnum < new_cluster.dbarr.ndbs; dbnum++)
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{
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DbInfo *new_db = &new_cluster.dbarr.dbs[dbnum];
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PGconn *conn = connectToServer(&new_cluster, new_db->db_name);
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/* suppress NOTICE of dropped objects */
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PQclear(executeQueryOrDie(conn,
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"SET client_min_messages = warning;"));
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PQclear(executeQueryOrDie(conn,
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"DROP SCHEMA binary_upgrade CASCADE;"));
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PQclear(executeQueryOrDie(conn,
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"RESET client_min_messages;"));
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PQfinish(conn);
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}
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check_ok();
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}
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/*
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* get_loadable_libraries()
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*
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* Fetch the names of all old libraries containing C-language functions.
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* We will later check that they all exist in the new installation.
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*/
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void
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get_loadable_libraries(void)
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{
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PGresult **ress;
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int totaltups;
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int dbnum;
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ress = (PGresult **)
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pg_malloc(old_cluster.dbarr.ndbs * sizeof(PGresult *));
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totaltups = 0;
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/* Fetch all library names, removing duplicates within each DB */
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for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
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{
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DbInfo *active_db = &old_cluster.dbarr.dbs[dbnum];
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PGconn *conn = connectToServer(&old_cluster, active_db->db_name);
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/* Fetch all libraries referenced in this DB */
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ress[dbnum] = executeQueryOrDie(conn,
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"SELECT DISTINCT probin "
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"FROM pg_catalog.pg_proc "
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"WHERE prolang = 13 /* C */ AND "
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"probin IS NOT NULL AND "
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"oid >= %u;",
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FirstNormalObjectId);
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totaltups += PQntuples(ress[dbnum]);
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PQfinish(conn);
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}
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/* Allocate what's certainly enough space */
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if (totaltups > 0)
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os_info.libraries = (char **) pg_malloc(totaltups * sizeof(char *));
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else
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os_info.libraries = NULL;
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/*
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* Now remove duplicates across DBs. This is pretty inefficient code, but
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* there probably aren't enough entries to matter.
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*/
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totaltups = 0;
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for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
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{
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PGresult *res = ress[dbnum];
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int ntups;
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int rowno;
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ntups = PQntuples(res);
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for (rowno = 0; rowno < ntups; rowno++)
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{
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char *lib = PQgetvalue(res, rowno, 0);
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bool dup = false;
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int n;
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for (n = 0; n < totaltups; n++)
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{
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if (strcmp(lib, os_info.libraries[n]) == 0)
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{
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dup = true;
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break;
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}
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}
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if (!dup)
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os_info.libraries[totaltups++] = pg_strdup(lib);
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}
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PQclear(res);
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}
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os_info.num_libraries = totaltups;
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pg_free(ress);
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}
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/*
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* check_loadable_libraries()
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*
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* Check that the new cluster contains all required libraries.
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* We do this by actually trying to LOAD each one, thereby testing
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* compatibility as well as presence.
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*/
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void
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check_loadable_libraries(void)
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{
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PGconn *conn = connectToServer(&new_cluster, "template1");
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int libnum;
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FILE *script = NULL;
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bool found = false;
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char output_path[MAXPGPATH];
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prep_status("Checking for presence of required libraries");
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snprintf(output_path, sizeof(output_path), "%s/loadable_libraries.txt",
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os_info.cwd);
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for (libnum = 0; libnum < os_info.num_libraries; libnum++)
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{
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char *lib = os_info.libraries[libnum];
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int llen = strlen(lib);
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char *cmd = (char *) pg_malloc(8 + 2 * llen + 1);
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PGresult *res;
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strcpy(cmd, "LOAD '");
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PQescapeStringConn(conn, cmd + 6, lib, llen, NULL);
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strcat(cmd, "'");
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res = PQexec(conn, cmd);
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if (PQresultStatus(res) != PGRES_COMMAND_OK)
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{
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found = true;
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if (script == NULL && (script = fopen(output_path, "w")) == NULL)
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pg_log(PG_FATAL, "Could not create necessary file: %s\n",
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output_path);
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fprintf(script, "Failed to load library: %s\n%s\n",
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lib,
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PQerrorMessage(conn));
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}
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PQclear(res);
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pg_free(cmd);
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}
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PQfinish(conn);
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if (found)
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{
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fclose(script);
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pg_log(PG_REPORT, "fatal\n");
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pg_log(PG_FATAL,
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"| Your installation references loadable libraries that are missing\n"
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"| from the new installation. You can add these libraries to\n"
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"| the new installation, or remove the functions using them\n"
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"| from the old installation. A list of the problem libraries\n"
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"| is in the file\n"
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"| \"%s\".\n\n", output_path);
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}
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else
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check_ok();
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}
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