src/dict/main.c

/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "restrict-access.h"
#include "ioloop.h"
#include "randgen.h"
#include "str.h"
#include "hostpid.h"
#include "stats-dist.h"
#include "process-title.h"
#include "env-util.h"
#include "module-dir.h"
#include "master-service.h"
#include "master-service-settings.h"
#include "sql-api.h"
#include "dict.h"
#include "dict-client.h"
#include "dict-commands.h"
#include "dict-connection.h"
#include "dict-settings.h"
#include "main.h"

static struct module *modules;
static struct timeout *to_proctitle;
static bool proctitle_updated;

static void
add_stats_string(string_t *str, struct stats_dist *stats, const char *name)
{
    str_printfa(str, ", %u %s:%"PRIu64"/%"PRIu64"/%"PRIu64"/%"PRIu64,
            stats_dist_get_count(stats), name,
            stats_dist_get_min(stats)/1000, stats_dist_get_avg(stats)/1000,
            stats_dist_get_95th(stats)/1000, stats_dist_get_max(stats)/1000);
    stats_dist_reset(stats);
}

static void dict_proctitle_update(void *context ATTR_UNUSED)
{
    string_t *str = t_str_new(128);

    if (!proctitle_updated)
        timeout_remove(&to_proctitle);

    str_printfa(str, "[%u clients", dict_connections_current_count());

    add_stats_string(str, cmd_stats.lookups, "lookups");
    add_stats_string(str, cmd_stats.iterations, "iters");
    add_stats_string(str, cmd_stats.commits, "commits");
    str_append_c(str, ']');

    process_title_set(str_c(str));
    proctitle_updated = FALSE;
}

void dict_proctitle_update_later(void)
{
    if (!dict_settings->verbose_proctitle)
        return;

    if (to_proctitle == NULL)
        to_proctitle = timeout_add(1000, dict_proctitle_update, NULL);
    proctitle_updated = TRUE;
}

static void dict_die(void)
{
    /* hope that other processes relying on us will die first. */
}

static void client_connected(struct master_service_connection *conn)
{
    master_service_client_connection_accept(conn);
    (void)dict_connection_create(conn->fd);
}

static void main_preinit(void)
{
    /* Load built-in SQL drivers (if any) */
    sql_drivers_init();
    sql_drivers_register_all();
#ifdef HAVE_CDB
    dict_driver_register(&dict_driver_cdb);
#endif

    restrict_access_by_env(RESTRICT_ACCESS_FLAG_ALLOW_ROOT, NULL);
    restrict_access_allow_coredumps(TRUE);
}

static void main_init(void)
{
    struct module_dir_load_settings mod_set;
    void **sets;

    sets = master_service_settings_get_others(master_service);
    dict_settings = sets[0];

    if (*dict_settings->dict_db_config != '\0') {
        /* for berkeley db library */
        env_put(t_strconcat("DB_CONFIG=", dict_settings->dict_db_config,
                    NULL));
    }

    i_zero(&mod_set);
    mod_set.abi_version = DOVECOT_ABI_VERSION;
    mod_set.require_init_funcs = TRUE;

    modules = module_dir_load(DICT_MODULE_DIR, NULL, &mod_set);
    module_dir_init(modules);

    /* Register only after loading modules. They may contain SQL drivers,
       which we'll need to register. */
    dict_drivers_register_all();
    dict_commands_init();
}

static void main_deinit(void)
{
    timeout_remove(&to_proctitle);

    dict_connections_destroy_all();
    dict_drivers_unregister_all();
    dict_commands_deinit();

    module_dir_unload(&modules);

    sql_drivers_deinit();
}

int main(int argc, char *argv[])
{
    const enum master_service_flags service_flags = 0;
    const struct setting_parser_info *set_roots[] = {
        &dict_setting_parser_info,
        NULL
    };
    const char *error;

    master_service = master_service_init("dict", service_flags,
                         &argc, &argv, "");
    if (master_getopt(master_service) > 0)
        return FATAL_DEFAULT;

    if (master_service_settings_read_simple(master_service, set_roots,
                        &error) < 0)
        i_fatal("Error reading configuration: %s", error);

    master_service_init_log(master_service, t_strdup_printf("dict(%s): ", my_pid));
    main_preinit();
    master_service_set_die_callback(master_service, dict_die);

    main_init();
    master_service_init_finish(master_service);
    master_service_run(master_service, client_connected);

    main_deinit();
    master_service_deinit(&master_service);
        return 0;
}