/* --------------------------------------------------------------------
 * guc.c
 *
 * Support for grand unified configuration scheme, including SET
 * command, configuration file, and
 command line options.
 * See src/backend/utils/misc/README for more information.
 *
 *
 * Copyright (c) 2000-2011, PostgreSQL Global Development Group
 * Portions Copyright (c) 2010-2012 Postgres-XC Development Group
 * Written by Peter Eisentraut <peter_e@gmx.net>.
 *
 * IDENTIFICATION
 *	  src/backend/utils/misc/guc.c
 *
 * --------------------------------------------------------------------
 */
#include "gtm/gtm_c.h"

#include <ctype.h>
#include <float.h>
#include <math.h>
#include <limits.h>
#include <unistd.h>
#include <sys/stat.h>

#include "gtm/gtm.h"
#include "gtm/path.h"
#include "gtm/gtm_opt_tables.h"
#include "gtm/gtm_opt.h"
#include "gtm/gtm_standby.h"

#define CONFIG_FILENAME "gtm.conf"
const char* config_filename = CONFIG_FILENAME;

/*
 * Variables declared elsewhere for gtm, mainly option variables.
 */

extern char* NodeName;
extern char* ListenAddresses;
extern bool Backup_synchronously;
extern int GTMPortNumber;
extern char* active_addr;
extern int active_port;
extern int GTM_StandbyMode;
extern char* error_reporter;
extern char* status_reader;
extern int log_min_messages;
extern int tcp_keepalives_idle;
extern int tcp_keepalives_count;
extern int tcp_keepalives_interval;
extern char* GTMDataDir;

/*
 * We have different sets for client and server message level options because
 * they sort slightly different (see "log" level)
 */

Server_Message_Level_Options();
Gtm_Startup_Mode_Options();

/*
 * GTM option variables that are exported from this module
 */
char* data_directory;
char* GTMConfigFileName;

/*
 * Displayable names for context types (enum GtmContext)
 */
gtmOptContext_Names();

/*
 * Displayable names for source types (enum GtmSource)
 */
gtmOptSource_Names();

/*
 * Displayable names for GTM variable types (enum config_type)
 */
Config_Type_Names();

/*
 * Contents of GTM tables
 *
 * See src/backend/utils/misc/README for design notes.
 *
 * TO ADD AN OPTION:
 *
 * 1. Declare a global variable of type bool, int, double, or char*
 *	  and make use of it.
 *
 * 2. Decide at what times it's safe to set the option. See guc.h for
 *	  details.
 *
 * 3. Decide on a name, a default value, upper and lower bounds (if
 *	  applicable), etc.
 *
 * 4. Add a record below.
 *
 * 5. Add it to src/backend/utils/misc/postgresql.conf.sample, if
 *	  appropriate.
 *
 * 6. Don't forget to document the option (at least in config.sgml).
 *
 * 7. If it's a new GTMOPT_LIST option you must edit pg_dumpall.c to ensure
 *	  it is not single quoted at dump time.
 */

/*
 * Definition of option name strings are given in gtm_opt.h, which are shared
 * with command line option handling.  Naming is GTM_OPTNAME_*.
 */

/******** option records follow ********/

struct config_bool ConfigureNamesBool[] = {
    {{GTM_OPTNAME_SYNCHRONOUS_BACKUP,
         GTMC_STARTUP,
         gettext_noop("Specifies if backup to GTM-Standby is taken in synchronous manner."),
         gettext_noop("Default value is off."),
         0},
        &Backup_synchronously,
        false,
        false,
        NULL},
    /* End-of-list marker */
    {{NULL, 0, NULL, NULL, 0}, NULL, false, false, NULL}};

struct config_int ConfigureNamesInt[] = {
    {{GTM_OPTNAME_PORT, GTMC_STARTUP, gettext_noop("Listen Port of GTM or GTM standby server."), NULL, 0},
        &GTMPortNumber,
        6666,
        0,
        INT_MAX,
        0,
        NULL},
    {{GTM_OPTNAME_ACTIVE_PORT,
         GTMC_SIGHUP,
         gettext_noop("GTM server port number when it works as GTM-Standby."),
         NULL,
         0},
        &active_port,
        0,
        0,
        INT_MAX,
        0,
        NULL},
    {{GTM_OPTNAME_KEEPALIVES_IDLE,
         GTMC_STARTUP,
         gettext_noop("Sets \"keepalives_idle\" option for the connection to GTM."),
         gettext_noop("This option is effective only when it runs as GTM-Standby."),
         GTMOPT_UNIT_TIME},
        &tcp_keepalives_idle,
        0,
        0,
        INT_MAX,
        0,
        NULL},
    {{GTM_OPTNAME_KEEPALIVES_INTERVAL,
         GTMC_STARTUP,
         gettext_noop("Sets \"keepalives_interval\" option fo the connetion to GTM."),
         gettext_noop("This option is effective only when it runs as GTM-Standby."),
         GTMOPT_UNIT_TIME},
        &tcp_keepalives_interval,
        0,
        0,
        INT_MAX,
        0,
        NULL},
    {{GTM_OPTNAME_KEEPALIVES_COUNT,
         GTMC_STARTUP,
         gettext_noop("Sets \"keepalives_count\" option to the connection to GTM."),
         gettext_noop("This option is effective only when it runs as GTM-Standby."),
         0},
        &tcp_keepalives_count,
        0,
        0,
        INT_MAX,
        0,
        NULL},
    /* End-of-list marker */
    {{NULL, 0, NULL, NULL, 0}, NULL, 0, 0, 0, 0, NULL}};

struct config_real ConfigureNamesReal[] = {
    /* End-of-list marker */
    {{NULL, 0, NULL, NULL, 0}, NULL, 0.0, 0.0, 0.0, 0.0, NULL}};

struct config_string ConfigureNamesString[] = {
    {{GTM_OPTNAME_DATA_DIR, GTMC_STARTUP, gettext_noop("Work directory."), NULL, 0}, &GTMDataDir, NULL, NULL, NULL},

    {{GTM_OPTNAME_CONFIG_FILE, GTMC_SIGHUP, gettext_noop("Configuration file name."), NULL, 0},
        &GTMConfigFileName,
        CONFIG_FILENAME,
        NULL,
        NULL},

    {{GTM_OPTNAME_NODENAME, GTMC_STARTUP, gettext_noop("Name of this GTM/GTM-Standby."), NULL, 0},
        &NodeName,
        "",
        NULL,
        NULL},

    {{GTM_OPTNAME_LISTEN_ADDRESSES, GTMC_STARTUP, gettext_noop("Listen address."), NULL, 0},
        &ListenAddresses,
        "*",
        NULL,
        NULL},

    {{GTM_OPTNAME_ACTIVE_HOST,
         GTMC_SIGHUP,
         gettext_noop("Address of target GTM ACT."),
         gettext_noop("This parameter is effective only when it runs as GTM-Standby"),
         0},
        &active_addr,
        NULL,
        NULL,
        NULL},

    {{GTM_OPTNAME_LOG_FILE, GTMC_SIGHUP, gettext_noop("Log file name."), NULL, 0}, &GTMLogFile, "gtm.log", NULL, NULL},

    {{GTM_OPTNAME_ERROR_REPORTER, GTMC_SIGHUP, gettext_noop("Command to report various errors."), NULL, 0},
        &error_reporter,
        NULL,
        NULL,
        NULL},

    {{GTM_OPTNAME_STATUS_READER,
         GTMC_SIGHUP,
         gettext_noop("Command to get status of global XC node status."),
         gettext_noop("Runs when configuration file is read by SIGHUP"),
         0},
        &status_reader,
        NULL,
        NULL,
        NULL},

    /* End-of-list marker */
    {{NULL, 0, NULL, NULL}, NULL, NULL, NULL, NULL}};

struct config_enum ConfigureNamesEnum[] = {{{GTM_OPTNAME_LOG_MIN_MESSAGES,
                                                GTMC_SIGHUP,
                                                gettext_noop("Minimum message level to write to the log file."),
                                                NULL,
                                                0},
                                               &log_min_messages,
                                               WARNING,
                                               server_message_level_options,
                                               WARNING,
                                               NULL},

    {{GTM_OPTNAME_STARTUP, GTMC_SIGHUP, gettext_noop("Specifies startup mode, act or standby."), NULL, 0},
        &GTM_StandbyMode,
        GTM_ACT_MODE,
        gtm_startup_mode_options,
        GTM_ACT_MODE,
        NULL},

    /* End-of-list marker */
    {{NULL, 0, NULL, NULL, 0}, NULL, 0, NULL, 0, NULL}};

/******** end of options list ********/

/*
 * Actual lookup of variables is done through this single, sorted array.
 */
struct config_generic** gtm_opt_variables;

/* Current number of variables contained in the vector */
int num_gtm_opt_variables;

/* Vector capacity */
int size_gtm_opt_variables;

bool reporting_enabled; /* TRUE to enable GTMOPT_REPORT */

int GTMOptUpdateCount = 0; /* Indicates when specific option is updated */