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b69f2e3640
Also, handle failure better: don't just blindly keep trying to delete stuff after the transaction has already failed. Tim Lewis, reviewed by Josh Kupershmidt, with further hacking by me.
451 lines
10 KiB
C
451 lines
10 KiB
C
/*-------------------------------------------------------------------------
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*
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* vacuumlo.c
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* This removes orphaned large objects from a database.
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*
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* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* contrib/vacuumlo/vacuumlo.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres_fe.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#ifdef HAVE_TERMIOS_H
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#include <termios.h>
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#endif
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#include "libpq-fe.h"
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#include "libpq/libpq-fs.h"
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#define atooid(x) ((Oid) strtoul((x), NULL, 10))
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#define BUFSIZE 1024
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extern char *optarg;
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extern int optind,
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opterr,
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optopt;
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enum trivalue
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{
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TRI_DEFAULT,
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TRI_NO,
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TRI_YES
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};
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struct _param
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{
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char *pg_user;
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enum trivalue pg_prompt;
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char *pg_port;
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char *pg_host;
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int verbose;
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int dry_run;
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long transaction_limit;
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};
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int vacuumlo(char *, struct _param *);
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void usage(const char *progname);
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/*
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* This vacuums LOs of one database. It returns 0 on success, -1 on failure.
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*/
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int
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vacuumlo(char *database, struct _param * param)
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{
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PGconn *conn;
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PGresult *res,
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*res2;
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char buf[BUFSIZE];
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long matched;
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long deleted;
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int i;
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static char *password = NULL;
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bool new_pass;
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bool success = true;
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if (param->pg_prompt == TRI_YES && password == NULL)
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password = simple_prompt("Password: ", 100, false);
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/*
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* Start the connection. Loop until we have a password if requested by
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* backend.
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*/
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do
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{
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new_pass = false;
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conn = PQsetdbLogin(param->pg_host,
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param->pg_port,
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NULL,
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NULL,
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database,
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param->pg_user,
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password);
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if (!conn)
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{
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fprintf(stderr, "Connection to database \"%s\" failed\n",
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database);
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return -1;
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}
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if (PQstatus(conn) == CONNECTION_BAD &&
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PQconnectionNeedsPassword(conn) &&
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password == NULL &&
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param->pg_prompt != TRI_NO)
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{
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PQfinish(conn);
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password = simple_prompt("Password: ", 100, false);
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new_pass = true;
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}
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} while (new_pass);
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/* check to see that the backend connection was successfully made */
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if (PQstatus(conn) == CONNECTION_BAD)
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{
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fprintf(stderr, "Connection to database \"%s\" failed:\n%s",
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database, PQerrorMessage(conn));
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PQfinish(conn);
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return -1;
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}
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if (param->verbose)
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{
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fprintf(stdout, "Connected to %s\n", database);
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if (param->dry_run)
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fprintf(stdout, "Test run: no large objects will be removed!\n");
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}
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/*
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* Don't get fooled by any non-system catalogs
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*/
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res = PQexec(conn, "SET search_path = pg_catalog");
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if (PQresultStatus(res) != PGRES_COMMAND_OK)
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{
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fprintf(stderr, "Failed to set search_path:\n");
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fprintf(stderr, "%s", PQerrorMessage(conn));
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PQclear(res);
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PQfinish(conn);
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return -1;
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}
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PQclear(res);
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/*
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* First we create and populate the LO temp table
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*/
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buf[0] = '\0';
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strcat(buf, "CREATE TEMP TABLE vacuum_l AS ");
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if (PQserverVersion(conn) >= 90000)
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strcat(buf, "SELECT oid AS lo FROM pg_largeobject_metadata");
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else
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strcat(buf, "SELECT DISTINCT loid AS lo FROM pg_largeobject");
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res = PQexec(conn, buf);
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if (PQresultStatus(res) != PGRES_COMMAND_OK)
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{
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fprintf(stderr, "Failed to create temp table:\n");
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fprintf(stderr, "%s", PQerrorMessage(conn));
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PQclear(res);
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PQfinish(conn);
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return -1;
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}
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PQclear(res);
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/*
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* Analyze the temp table so that planner will generate decent plans for
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* the DELETEs below.
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*/
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buf[0] = '\0';
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strcat(buf, "ANALYZE vacuum_l");
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res = PQexec(conn, buf);
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if (PQresultStatus(res) != PGRES_COMMAND_OK)
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{
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fprintf(stderr, "Failed to vacuum temp table:\n");
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fprintf(stderr, "%s", PQerrorMessage(conn));
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PQclear(res);
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PQfinish(conn);
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return -1;
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}
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PQclear(res);
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/*
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* Now find any candidate tables that have columns of type oid.
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*
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* NOTE: we ignore system tables and temp tables by the expedient of
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* rejecting tables in schemas named 'pg_*'. In particular, the temp
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* table formed above is ignored, and pg_largeobject will be too. If
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* either of these were scanned, obviously we'd end up with nothing to
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* delete...
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*
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* NOTE: the system oid column is ignored, as it has attnum < 1. This
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* shouldn't matter for correctness, but it saves time.
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*/
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buf[0] = '\0';
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strcat(buf, "SELECT s.nspname, c.relname, a.attname ");
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strcat(buf, "FROM pg_class c, pg_attribute a, pg_namespace s, pg_type t ");
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strcat(buf, "WHERE a.attnum > 0 AND NOT a.attisdropped ");
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strcat(buf, " AND a.attrelid = c.oid ");
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strcat(buf, " AND a.atttypid = t.oid ");
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strcat(buf, " AND c.relnamespace = s.oid ");
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strcat(buf, " AND t.typname in ('oid', 'lo') ");
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strcat(buf, " AND c.relkind = 'r'");
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strcat(buf, " AND s.nspname !~ '^pg_'");
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res = PQexec(conn, buf);
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if (PQresultStatus(res) != PGRES_TUPLES_OK)
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{
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fprintf(stderr, "Failed to find OID columns:\n");
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fprintf(stderr, "%s", PQerrorMessage(conn));
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PQclear(res);
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PQfinish(conn);
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return -1;
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}
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for (i = 0; i < PQntuples(res); i++)
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{
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char *schema,
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*table,
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*field;
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schema = PQgetvalue(res, i, 0);
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table = PQgetvalue(res, i, 1);
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field = PQgetvalue(res, i, 2);
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if (param->verbose)
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fprintf(stdout, "Checking %s in %s.%s\n", field, schema, table);
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snprintf(buf, BUFSIZE,
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"DELETE FROM vacuum_l "
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"WHERE lo IN (SELECT \"%s\" FROM \"%s\".\"%s\")",
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field, schema, table);
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res2 = PQexec(conn, buf);
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if (PQresultStatus(res2) != PGRES_COMMAND_OK)
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{
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fprintf(stderr, "Failed to check %s in table %s.%s:\n",
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field, schema, table);
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fprintf(stderr, "%s", PQerrorMessage(conn));
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PQclear(res2);
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PQclear(res);
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PQfinish(conn);
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return -1;
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}
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PQclear(res2);
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}
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PQclear(res);
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/*
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* Run the actual deletes in a single transaction. Note that this would
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* be a bad idea in pre-7.1 Postgres releases (since rolling back a table
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* delete used to cause problems), but it should be safe now.
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*/
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res = PQexec(conn, "begin");
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PQclear(res);
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/*
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* Finally, those entries remaining in vacuum_l are orphans.
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*/
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buf[0] = '\0';
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strcat(buf, "SELECT lo ");
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strcat(buf, "FROM vacuum_l");
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res = PQexec(conn, buf);
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if (PQresultStatus(res) != PGRES_TUPLES_OK)
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{
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fprintf(stderr, "Failed to read temp table:\n");
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fprintf(stderr, "%s", PQerrorMessage(conn));
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PQclear(res);
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PQfinish(conn);
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return -1;
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}
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matched = PQntuples(res);
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deleted = 0;
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for (i = 0; i < matched; i++)
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{
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Oid lo = atooid(PQgetvalue(res, i, 0));
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if (param->verbose)
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{
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fprintf(stdout, "\rRemoving lo %6u ", lo);
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fflush(stdout);
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}
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if (param->dry_run == 0)
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{
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if (lo_unlink(conn, lo) < 0)
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{
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fprintf(stderr, "\nFailed to remove lo %u: ", lo);
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fprintf(stderr, "%s", PQerrorMessage(conn));
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if (PQtransactionStatus(conn) == PQTRANS_INERROR)
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{
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success = false;
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break;
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}
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}
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else
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deleted++;
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}
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else
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deleted++;
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if (param->transaction_limit != 0 && deleted >= param->transaction_limit)
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break;
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}
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PQclear(res);
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/*
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* That's all folks!
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*/
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res = PQexec(conn, "end");
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PQclear(res);
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PQfinish(conn);
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if (param->verbose)
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{
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if (param->dry_run)
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fprintf(stdout, "\rWould remove %ld large objects from %s.\n",
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deleted, database);
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else if (success)
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fprintf(stdout,
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"\rSuccessfully removed %ld large objects from %s.\n",
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deleted, database);
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else
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fprintf(stdout, "\rRemoval from %s failed at object %ld of %ld.\n",
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database, deleted, matched);
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}
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return ((param->dry_run || success) ? 0 : -1);
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}
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void
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usage(const char *progname)
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{
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printf("%s removes unreferenced large objects from databases.\n\n", progname);
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printf("Usage:\n %s [OPTION]... DBNAME...\n\n", progname);
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printf("Options:\n");
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printf(" -h HOSTNAME database server host or socket directory\n");
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printf(" -l LIMIT stop after removing LIMIT large objects\n");
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printf(" -n don't remove large objects, just show what would be done\n");
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printf(" -p PORT database server port\n");
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printf(" -U USERNAME user name to connect as\n");
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printf(" -w never prompt for password\n");
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printf(" -W force password prompt\n");
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printf(" -v write a lot of progress messages\n");
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printf(" --help show this help, then exit\n");
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printf(" --version output version information, then exit\n");
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printf("\n");
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printf("Report bugs to <pgsql-bugs@postgresql.org>.\n");
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}
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int
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main(int argc, char **argv)
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{
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int rc = 0;
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struct _param param;
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int c;
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int port;
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const char *progname;
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progname = get_progname(argv[0]);
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/* Parameter handling */
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param.pg_user = NULL;
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param.pg_prompt = TRI_DEFAULT;
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param.pg_host = NULL;
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param.pg_port = NULL;
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param.verbose = 0;
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param.dry_run = 0;
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param.transaction_limit = 0;
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if (argc > 1)
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{
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if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
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{
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usage(progname);
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exit(0);
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}
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if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
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{
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puts("vacuumlo (PostgreSQL) " PG_VERSION);
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exit(0);
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}
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}
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while (1)
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{
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c = getopt(argc, argv, "h:l:U:p:vnwW");
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if (c == -1)
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break;
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switch (c)
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{
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case '?':
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fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
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exit(1);
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case ':':
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exit(1);
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case 'v':
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param.verbose = 1;
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break;
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case 'n':
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param.dry_run = 1;
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param.verbose = 1;
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break;
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case 'U':
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param.pg_user = strdup(optarg);
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break;
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case 'w':
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param.pg_prompt = TRI_NO;
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break;
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case 'W':
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param.pg_prompt = TRI_YES;
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break;
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case 'p':
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port = strtol(optarg, NULL, 10);
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if ((port < 1) || (port > 65535))
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{
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fprintf(stderr, "%s: invalid port number: %s\n", progname, optarg);
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exit(1);
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}
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param.pg_port = strdup(optarg);
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break;
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case 'l':
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param.transaction_limit = strtol(optarg, NULL, 10);
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if (param.transaction_limit < 0)
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{
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fprintf(stderr,
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"%s: transaction limit must not be negative (0 disables)\n",
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progname);
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exit(1);
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}
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break;
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case 'h':
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param.pg_host = strdup(optarg);
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break;
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}
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}
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/* No database given? Show usage */
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if (optind >= argc)
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{
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fprintf(stderr, "vacuumlo: missing required argument: database name\n");
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fprintf(stderr, "Try 'vacuumlo -?' for help.\n");
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exit(1);
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}
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for (c = optind; c < argc; c++)
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{
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/* Work on selected database */
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rc += (vacuumlo(argv[c], ¶m) != 0);
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}
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return rc;
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}
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