clusterdb.c

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/*-------------------------------------------------------------------------
 *
 * clusterdb
 *
 * Portions Copyright (c) 2002-2023, PostgreSQL Global Development Group
 *
 * src/bin/scripts/clusterdb.c
 *
 *-------------------------------------------------------------------------
 */
 
#include "postgres_fe.h"
#include "common.h"
#include "common/logging.h"
#include "fe_utils/cancel.h"
#include "fe_utils/option_utils.h"
#include "fe_utils/query_utils.h"
#include "fe_utils/simple_list.h"
#include "fe_utils/string_utils.h"
 
 
static void cluster_one_database(const ConnParams *cparams, const char *table,
                                 const char *progname, bool verbose, bool echo);
static void cluster_all_databases(ConnParams *cparams, const char *progname,
                                  bool verbose, bool echo, bool quiet);
static void help(const char *progname);
 
 
int
main(int argc, char *argv[])
{
    static struct option long_options[] = {
        {"host", required_argument, NULL, 'h'},
        {"port", required_argument, NULL, 'p'},
        {"username", required_argument, NULL, 'U'},
        {"no-password", no_argument, NULL, 'w'},
        {"password", no_argument, NULL, 'W'},
        {"echo", no_argument, NULL, 'e'},
        {"quiet", no_argument, NULL, 'q'},
        {"dbname", required_argument, NULL, 'd'},
        {"all", no_argument, NULL, 'a'},
        {"table", required_argument, NULL, 't'},
        {"verbose", no_argument, NULL, 'v'},
        {"maintenance-db", required_argument, NULL, 2},
        {NULL, 0, NULL, 0}
    };
 
    const char *progname;
    int         optindex;
    int         c;
 
    const char *dbname = NULL;
    const char *maintenance_db = NULL;
    char       *host = NULL;
    char       *port = NULL;
    char       *username = NULL;
    enum trivalue prompt_password = TRI_DEFAULT;
    ConnParams  cparams;
    bool        echo = false;
    bool        quiet = false;
    bool        alldb = false;
    bool        verbose = false;
    SimpleStringList tables = {NULL, NULL};
 
    pg_logging_init(argv[0]);
    progname = get_progname(argv[0]);
    set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pgscripts"));
 
    handle_help_version_opts(argc, argv, "clusterdb", help);
 
    while ((c = getopt_long(argc, argv, "ad:eh:p:qt:U:vwW", long_options, &optindex)) != -1)
    {
        switch (c)
        {
            case 'a':
                alldb = true;
                break;
            case 'd':
                dbname = pg_strdup(optarg);
                break;
            case 'e':
                echo = true;
                break;
            case 'h':
                host = pg_strdup(optarg);
                break;
            case 'p':
                port = pg_strdup(optarg);
                break;
            case 'q':
                quiet = true;
                break;
            case 't':
                simple_string_list_append(&tables, optarg);
                break;
            case 'U':
                username = pg_strdup(optarg);
                break;
            case 'v':
                verbose = true;
                break;
            case 'w':
                prompt_password = TRI_NO;
                break;
            case 'W':
                prompt_password = TRI_YES;
                break;
            case 2:
                maintenance_db = pg_strdup(optarg);
                break;
            default:
                /* getopt_long already emitted a complaint */
                pg_log_error_hint("Try \"%s --help\" for more information.", progname);
                exit(1);
        }
    }
 
    /*
     * Non-option argument specifies database name as long as it wasn't
     * already specified with -d / --dbname
     */
    if (optind < argc && dbname == NULL)
    {
        dbname = argv[optind];
        optind++;
    }
 
    if (optind < argc)
    {
        pg_log_error("too many command-line arguments (first is \"%s\")",
                     argv[optind]);
        pg_log_error_hint("Try \"%s --help\" for more information.", progname);
        exit(1);
    }
 
    /* fill cparams except for dbname, which is set below */
    cparams.pghost = host;
    cparams.pgport = port;
    cparams.pguser = username;
    cparams.prompt_password = prompt_password;
    cparams.override_dbname = NULL;
 
    setup_cancel_handler(NULL);
 
    if (alldb)
    {
        if (dbname)
            pg_fatal("cannot cluster all databases and a specific one at the same time");
 
        if (tables.head != NULL)
            pg_fatal("cannot cluster specific table(s) in all databases");
 
        cparams.dbname = maintenance_db;
 
        cluster_all_databases(&cparams, progname, verbose, echo, quiet);
    }
    else
    {
        if (dbname == NULL)
        {
            if (getenv("PGDATABASE"))
                dbname = getenv("PGDATABASE");
            else if (getenv("PGUSER"))
                dbname = getenv("PGUSER");
            else
                dbname = get_user_name_or_exit(progname);
        }
 
        cparams.dbname = dbname;
 
        if (tables.head != NULL)
        {
            SimpleStringListCell *cell;
 
            for (cell = tables.head; cell; cell = cell->next)
            {
                cluster_one_database(&cparams, cell->val,
                                     progname, verbose, echo);
            }
        }
        else
            cluster_one_database(&cparams, NULL,
                                 progname, verbose, echo);
    }
 
    exit(0);
}
 
 
static void
cluster_one_database(const ConnParams *cparams, const char *table,
                     const char *progname, bool verbose, bool echo)
{
    PQExpBufferData sql;
 
    PGconn     *conn;
 
    conn = connectDatabase(cparams, progname, echo, false, true);
 
    initPQExpBuffer(&sql);
 
    appendPQExpBufferStr(&sql, "CLUSTER");
    if (verbose)
        appendPQExpBufferStr(&sql, " VERBOSE");
    if (table)
    {
        appendPQExpBufferChar(&sql, ' ');
        appendQualifiedRelation(&sql, table, conn, echo);
    }
    appendPQExpBufferChar(&sql, ';');
 
    if (!executeMaintenanceCommand(conn, sql.data, echo))
    {
        if (table)
            pg_log_error("clustering of table \"%s\" in database \"%s\" failed: %s",
                         table, PQdb(conn), PQerrorMessage(conn));
        else
            pg_log_error("clustering of database \"%s\" failed: %s",
                         PQdb(conn), PQerrorMessage(conn));
        PQfinish(conn);
        exit(1);
    }
    PQfinish(conn);
    termPQExpBuffer(&sql);
}
 
 
static void
cluster_all_databases(ConnParams *cparams, const char *progname,
                      bool verbose, bool echo, bool quiet)
{
    PGconn     *conn;
    PGresult   *result;
    int         i;
 
    conn = connectMaintenanceDatabase(cparams, progname, echo);
    result = executeQuery(conn,
                          "SELECT datname FROM pg_database WHERE datallowconn AND datconnlimit <> -2 ORDER BY 1;",
                          echo);
    PQfinish(conn);
 
    for (i = 0; i < PQntuples(result); i++)
    {
        char       *dbname = PQgetvalue(result, i, 0);
 
        if (!quiet)
        {
            printf(_("%s: clustering database \"%s\"\n"), progname, dbname);
            fflush(stdout);
        }
 
        cparams->override_dbname = dbname;
 
        cluster_one_database(cparams, NULL, progname, verbose, echo);
    }
 
    PQclear(result);
}
 
 
static void
help(const char *progname)
{
    printf(_("%s clusters all previously clustered tables in a database.\n\n"), progname);
    printf(_("Usage:\n"));
    printf(_("  %s [OPTION]... [DBNAME]\n"), progname);
    printf(_("\nOptions:\n"));
    printf(_("  -a, --all                 cluster all databases\n"));
    printf(_("  -d, --dbname=DBNAME       database to cluster\n"));
    printf(_("  -e, --echo                show the commands being sent to the server\n"));
    printf(_("  -q, --quiet               don't write any messages\n"));
    printf(_("  -t, --table=TABLE         cluster specific table(s) only\n"));
    printf(_("  -v, --verbose             write a lot of output\n"));
    printf(_("  -V, --version             output version information, then exit\n"));
    printf(_("  -?, --help                show this help, then exit\n"));
    printf(_("\nConnection options:\n"));
    printf(_("  -h, --host=HOSTNAME       database server host or socket directory\n"));
    printf(_("  -p, --port=PORT           database server port\n"));
    printf(_("  -U, --username=USERNAME   user name to connect as\n"));
    printf(_("  -w, --no-password         never prompt for password\n"));
    printf(_("  -W, --password            force password prompt\n"));
    printf(_("  --maintenance-db=DBNAME   alternate maintenance database\n"));
    printf(_("\nRead the description of the SQL command CLUSTER for details.\n"));
    printf(_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
    printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
}