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/*-------------------------------------------------------------------------
*
* pg_isready --- checks the status of the PostgreSQL server
*
* Copyright (c) 2013-2022, PostgreSQL Global Development Group
*
* src/bin/scripts/pg_isready.c
*
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include "common.h"
#include "common/logging.h"
#include "fe_utils/option_utils.h"
#define DEFAULT_CONNECT_TIMEOUT "3"
static void
help(const char *progname);
int
main(int argc, char **argv)
{
int c;
const char *progname;
const char *pghost = NULL;
const char *pgport = NULL;
const char *pguser = NULL;
const char *pgdbname = NULL;
const char *connect_timeout = DEFAULT_CONNECT_TIMEOUT;
const char *pghost_str = NULL;
const char *pghostaddr_str = NULL;
const char *pgport_str = NULL;
#define PARAMS_ARRAY_SIZE 7
const char *keywords[PARAMS_ARRAY_SIZE];
const char *values[PARAMS_ARRAY_SIZE];
bool quiet = false;
PGPing rv;
PQconninfoOption *opts = NULL;
PQconninfoOption *defs = NULL;
PQconninfoOption *opt;
PQconninfoOption *def;
char *errmsg = NULL;
/*
* We accept user and database as options to avoid useless errors from
* connecting with invalid params
*/
static struct option long_options[] = {
{"dbname", required_argument, NULL, 'd'},
{"host", required_argument, NULL, 'h'},
{"port", required_argument, NULL, 'p'},
{"quiet", no_argument, NULL, 'q'},
{"timeout", required_argument, NULL, 't'},
{"username", required_argument, NULL, 'U'},
{NULL, 0, NULL, 0}
};
pg_logging_init(argv[0]);
progname = get_progname(argv[0]);
set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pgscripts"));
handle_help_version_opts(argc, argv, progname, help);
while ((c = getopt_long(argc, argv, "d:h:p:qt:U:", long_options, NULL)) != -1)
{
switch (c)
{
case 'd':
pgdbname = pg_strdup(optarg);
break;
case 'h':
pghost = pg_strdup(optarg);
break;
case 'p':
pgport = pg_strdup(optarg);
break;
case 'q':
quiet = true;
break;
case 't':
connect_timeout = pg_strdup(optarg);
break;
case 'U':
pguser = pg_strdup(optarg);
break;
default:
/* getopt_long already emitted a complaint */
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
/*
* We need to make sure we don't return 1 here because someone
* checking the return code might infer unintended meaning
*/
exit(PQPING_NO_ATTEMPT);
}
}
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);
/*
* We need to make sure we don't return 1 here because someone
* checking the return code might infer unintended meaning
*/
exit(PQPING_NO_ATTEMPT);
}
keywords[0] = "host";
values[0] = pghost;
keywords[1] = "port";
values[1] = pgport;
keywords[2] = "user";
values[2] = pguser;
keywords[3] = "dbname";
values[3] = pgdbname;
keywords[4] = "connect_timeout";
values[4] = connect_timeout;
keywords[5] = "fallback_application_name";
values[5] = progname;
keywords[6] = NULL;
values[6] = NULL;
/*
* Get the host and port so we can display them in our output
*/
if (pgdbname &&
(strncmp(pgdbname, "postgresql://", 13) == 0 ||
strncmp(pgdbname, "postgres://", 11) == 0 ||
strchr(pgdbname, '=') != NULL))
{
opts = PQconninfoParse(pgdbname, &errmsg);
if (opts == NULL)
{
pg_log_error("%s", errmsg);
exit(PQPING_NO_ATTEMPT);
}
}
defs = PQconndefaults();
if (defs == NULL)
{
pg_log_error("could not fetch default options");
exit(PQPING_NO_ATTEMPT);
}
for (opt = opts, def = defs; def->keyword; def++)
{
if (strcmp(def->keyword, "host") == 0)
{
if (opt && opt->val)
pghost_str = opt->val;
else if (pghost)
pghost_str = pghost;
else if (def->val)
pghost_str = def->val;
else
pghost_str = DEFAULT_PGSOCKET_DIR;
}
else if (strcmp(def->keyword, "hostaddr") == 0)
{
if (opt && opt->val)
pghostaddr_str = opt->val;
else if (def->val)
pghostaddr_str = def->val;
}
else if (strcmp(def->keyword, "port") == 0)
{
if (opt && opt->val)
pgport_str = opt->val;
else if (pgport)
pgport_str = pgport;
else if (def->val)
pgport_str = def->val;
}
if (opt)
opt++;
}
rv = PQpingParams(keywords, values, 1);
if (!quiet)
{
printf("%s:%s - ",
pghostaddr_str != NULL ? pghostaddr_str : pghost_str,
pgport_str);
switch (rv)
{
case PQPING_OK:
printf(_("accepting connections\n"));
break;
case PQPING_REJECT:
printf(_("rejecting connections\n"));
break;
case PQPING_NO_RESPONSE:
printf(_("no response\n"));
break;
case PQPING_NO_ATTEMPT:
printf(_("no attempt\n"));
break;
default:
printf(_("unknown\n"));
}
}
exit(rv);
}
static void
help(const char *progname)
{
printf(_("%s issues a connection check to a PostgreSQL database.\n\n"), progname);
printf(_("Usage:\n"));
printf(_(" %s [OPTION]...\n"), progname);
printf(_("\nOptions:\n"));
printf(_(" -d, --dbname=DBNAME database name\n"));
printf(_(" -q, --quiet run quietly\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(_(" -t, --timeout=SECS seconds to wait when attempting connection, 0 disables (default: %s)\n"), DEFAULT_CONNECT_TIMEOUT);
printf(_(" -U, --username=USERNAME user name to connect as\n"));
printf(_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
}
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