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pglogical_create_subscriber.c
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pglogical_create_subscriber.c
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/* -------------------------------------------------------------------------
*
* pglogical_create_subscriber.c
* Initialize a new pglogical subscriber from a physical base backup
*
* Copyright (C) 2012-2016, PostgreSQL Global Development Group
*
* IDENTIFICATION
* pglogical_create_subscriber.c
*
* -------------------------------------------------------------------------
*/
/* dirent.h on port/win32_msvc expects MAX_PATH to be defined */
#if defined(_WIN32)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
#include <dirent.h>
#include <fcntl.h>
#include <locale.h>
#include <signal.h>
#include <time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
/* Note the order is important for debian here. */
#if !defined(pg_attribute_printf)
/* GCC and XLC support format attributes */
#if defined(__GNUC__) || defined(__IBMC__)
#define pg_attribute_format_arg(a) __attribute__((format_arg(a)))
#define pg_attribute_printf(f,a) __attribute__((format(PG_PRINTF_ATTRIBUTE, f, a)))
#else
#define pg_attribute_format_arg(a)
#define pg_attribute_printf(f,a)
#endif
#endif
#include "libpq-fe.h"
#include "postgres_fe.h"
#include "pqexpbuffer.h"
#include "getopt_long.h"
#include "miscadmin.h"
#include "access/timeline.h"
#include "access/xlog_internal.h"
#include "catalog/pg_control.h"
#include "pglogical_fe.h"
#define MAX_APPLY_DELAY 86400
typedef struct RemoteInfo {
Oid nodeid;
char *node_name;
char *sysid;
char *dbname;
char *replication_sets;
} RemoteInfo;
typedef enum {
VERBOSITY_NORMAL,
VERBOSITY_VERBOSE,
VERBOSITY_DEBUG
} VerbosityLevelEnum;
static char *argv0 = NULL;
static const char *progname;
static char *data_dir = NULL;
static char pid_file[MAXPGPATH];
static time_t start_time;
static VerbosityLevelEnum verbosity = VERBOSITY_NORMAL;
/* defined as static so that die() can close them */
static PGconn *subscriber_conn = NULL;
static PGconn *provider_conn = NULL;
static void signal_handler(int sig);
static void usage(void);
static void die(const char *fmt,...)
pg_attribute_printf(1, 2);
static void print_msg(VerbosityLevelEnum level, const char *fmt,...)
pg_attribute_printf(2, 3);
static int run_pg_ctl(const char *arg);
static void run_basebackup(const char *provider_connstr, const char *data_dir,
const char *extra_basebackup_args);
static void wait_postmaster_connection(const char *connstr);
static void wait_primary_connection(const char *connstr);
static void wait_postmaster_shutdown(void);
static char *validate_replication_set_input(char *replication_sets);
static void remove_unwanted_data(PGconn *conn);
static void initialize_replication_origin(PGconn *conn, char *origin_name, char *remote_lsn);
static char *create_restore_point(PGconn *conn, char *restore_point_name);
static char *initialize_replication_slot(PGconn *conn, char *dbname,
char *provider_node_name, char *subscription_name,
bool drop_slot_if_exists);
static void pglogical_subscribe(PGconn *conn, char *subscriber_name,
char *subscriber_dsn,
char *provider_connstr,
char *replication_sets,
int apply_delay,
bool force_text_transfer);
static RemoteInfo *get_remote_info(PGconn* conn);
static bool extension_exists(PGconn *conn, const char *extname);
static void install_extension(PGconn *conn, const char *extname);
static void initialize_data_dir(char *data_dir, char *connstr,
char *postgresql_conf, char *pg_hba_conf,
char *extra_basebackup_args);
static bool check_data_dir(char *data_dir, RemoteInfo *remoteinfo);
static char *read_sysid(const char *data_dir);
static void WriteRecoveryConf(PQExpBuffer contents);
static void CopyConfFile(char *fromfile, char *tofile, bool append);
static char *get_connstr_dbname(char *connstr);
static char *get_connstr(char *connstr, char *dbname);
static char *PQconninfoParamsToConnstr(const char *const * keywords, const char *const * values);
static void appendPQExpBufferConnstrValue(PQExpBuffer buf, const char *str);
static bool file_exists(const char *path);
static bool is_pg_dir(const char *path);
static void copy_file(char *fromfile, char *tofile, bool append);
static char *find_other_exec_or_die(const char *argv0, const char *target);
static bool postmaster_is_alive(pid_t pid);
static long get_pgpid(void);
static char **get_database_list(char *databases, int *n_databases);
static char *generate_restore_point_name(void);
static PGconn *
connectdb(const char *connstr)
{
PGconn *conn;
conn = PQconnectdb(connstr);
if (PQstatus(conn) != CONNECTION_OK)
die(_("Connection to database failed: %s, connection string was: %s\n"), PQerrorMessage(conn), connstr);
return conn;
}
void signal_handler(int sig)
{
if (sig == SIGINT)
{
die(_("\nCanceling...\n"));
}
}
int
main(int argc, char **argv)
{
int i;
int c;
PQExpBuffer recoveryconfcontents = createPQExpBuffer();
RemoteInfo *remote_info;
char *remote_lsn;
bool stop = false;
bool drop_slot_if_exists = false;
int optindex;
char *subscriber_name = NULL;
char *base_sub_connstr = NULL;
char *base_prov_connstr = NULL;
char *replication_sets = NULL;
char *databases = NULL;
char *postgresql_conf = NULL,
*pg_hba_conf = NULL,
*recovery_conf = NULL;
int apply_delay = 0;
bool force_text_transfer = false;
char **slot_names;
char *sub_connstr;
char *prov_connstr;
char **database_list = { NULL };
int n_databases = 1;
int dbnum;
bool use_existing_data_dir = false;
int pg_ctl_ret,
logfd;
char *restore_point_name = NULL;
char *extra_basebackup_args = NULL;
static struct option long_options[] = {
{"subscriber-name", required_argument, NULL, 'n'},
{"pgdata", required_argument, NULL, 'D'},
{"provider-dsn", required_argument, NULL, 1},
{"subscriber-dsn", required_argument, NULL, 2},
{"replication-sets", required_argument, NULL, 3},
{"postgresql-conf", required_argument, NULL, 4},
{"hba-conf", required_argument, NULL, 5},
{"recovery-conf", required_argument, NULL, 6},
{"stop", no_argument, NULL, 's'},
{"drop-slot-if-exists", no_argument, NULL, 7},
{"apply-delay", required_argument, NULL, 8},
{"databases", required_argument, NULL, 9},
{"extra-basebackup-args", required_argument, NULL, 10},
{"text-types", no_argument, NULL, 11},
{NULL, 0, NULL, 0}
};
argv0 = argv[0];
progname = get_progname(argv[0]);
start_time = time(NULL);
signal(SIGINT, signal_handler);
/* check for --help */
if (argc > 1)
{
for (i = 1; i < argc; i++)
{
if (strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "-?") == 0)
{
usage();
exit(0);
}
}
}
/* Option parsing and validation */
while ((c = getopt_long(argc, argv, "D:n:sv", long_options, &optindex)) != -1)
{
switch (c)
{
case 'D':
data_dir = pg_strdup(optarg);
break;
case 'n':
subscriber_name = pg_strdup(optarg);
break;
case 1:
base_prov_connstr = pg_strdup(optarg);
break;
case 2:
base_sub_connstr = pg_strdup(optarg);
break;
case 3:
replication_sets = validate_replication_set_input(pg_strdup(optarg));
break;
case 4:
{
postgresql_conf = pg_strdup(optarg);
if (postgresql_conf != NULL && !file_exists(postgresql_conf))
die(_("The specified postgresql.conf file does not exist."));
break;
}
case 5:
{
pg_hba_conf = pg_strdup(optarg);
if (pg_hba_conf != NULL && !file_exists(pg_hba_conf))
die(_("The specified pg_hba.conf file does not exist."));
break;
}
case 6:
{
recovery_conf = pg_strdup(optarg);
if (recovery_conf != NULL && !file_exists(recovery_conf))
die(_("The specified recovery configuration file does not exist."));
break;
}
case 'v':
verbosity++;
break;
case 's':
stop = true;
break;
case 7:
drop_slot_if_exists = true;
break;
case 8:
apply_delay = atoi(optarg);
break;
case 9:
databases = pg_strdup(optarg);
break;
case 10:
extra_basebackup_args = pg_strdup(optarg);
break;
case 11:
force_text_transfer = true;
break;
default:
fprintf(stderr, _("Unknown option\n"));
fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
exit(1);
}
}
/*
* Sanity checks
*/
if (data_dir == NULL)
{
fprintf(stderr, _("No data directory specified\n"));
fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
exit(1);
}
else if (subscriber_name == NULL)
{
fprintf(stderr, _("No subscriber name specified\n"));
fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
exit(1);
}
if (!base_prov_connstr || !strlen(base_prov_connstr))
die(_("Provider connection string must be specified.\n"));
if (!base_sub_connstr || !strlen(base_sub_connstr))
die(_("Subscriber connection string must be specified.\n"));
if (apply_delay < 0)
die(_("Apply delay cannot be negative.\n"));
if (apply_delay > MAX_APPLY_DELAY)
die(_("Apply delay cannot be more than %d.\n"), MAX_APPLY_DELAY);
if (!replication_sets || !strlen(replication_sets))
replication_sets = "default,default_insert_only,ddl_sql";
/* Init random numbers used for slot suffixes, etc */
srand(time(NULL));
/* Parse database list or connection string. */
if (databases != NULL)
{
database_list = get_database_list(databases, &n_databases);
}
else
{
char *dbname = get_connstr_dbname(base_prov_connstr);
if (!dbname)
die(_("Either provider connection string must contain database "
"name or --databases option must be specified.\n"));
n_databases = 1;
database_list = palloc(n_databases * sizeof(char *));
database_list[0] = dbname;
}
slot_names = palloc(n_databases * sizeof(char *));
/*
* Check connection strings for validity before doing anything
* expensive.
*/
for (dbnum = 0; dbnum < n_databases; dbnum++)
{
char *db = database_list[dbnum];
prov_connstr = get_connstr(base_prov_connstr, db);
if (!prov_connstr || !strlen(prov_connstr))
die(_("Provider connection string is not valid.\n"));
sub_connstr = get_connstr(base_sub_connstr, db);
if (!sub_connstr || !strlen(sub_connstr))
die(_("Subscriber connection string is not valid.\n"));
}
/*
* Create log file where new postgres instance will log to while being
* initialized.
*/
logfd = open("pglogical_create_subscriber_postgres.log", O_CREAT | O_RDWR,
S_IRUSR | S_IWUSR);
if (logfd == -1)
{
die(_("Creating pglogical_create_subscriber_postgres.log failed: %s"),
strerror(errno));
}
/* Safe to close() unchecked, we didn't write */
(void) close(logfd);
/* Let's start the real work... */
print_msg(VERBOSITY_NORMAL, _("%s: starting ...\n"), progname);
for (dbnum = 0; dbnum < n_databases; dbnum++)
{
char *db = database_list[dbnum];
prov_connstr = get_connstr(base_prov_connstr, db);
if (!prov_connstr || !strlen(prov_connstr))
die(_("Provider connection string is not valid.\n"));
/* Read the remote server indetification. */
print_msg(VERBOSITY_NORMAL,
_("Getting information for database %s ...\n"), db);
provider_conn = connectdb(prov_connstr);
remote_info = get_remote_info(provider_conn);
/* only need to do this piece once */
if (dbnum == 0)
{
use_existing_data_dir = check_data_dir(data_dir, remote_info);
if (use_existing_data_dir &&
strcmp(remote_info->sysid, read_sysid(data_dir)) != 0)
die(_("Subscriber data directory is not basebackup of remote node.\n"));
}
/*
* Create replication slots on remote node.
*/
print_msg(VERBOSITY_NORMAL,
_("Creating replication slot in database %s ...\n"), db);
slot_names[dbnum] = initialize_replication_slot(provider_conn,
remote_info->dbname,
remote_info->node_name,
subscriber_name,
drop_slot_if_exists);
PQfinish(provider_conn);
provider_conn = NULL;
}
/*
* Create basebackup or use existing one
*/
prov_connstr = get_connstr(base_prov_connstr, database_list[0]);
sub_connstr = get_connstr(base_sub_connstr, database_list[0]);
initialize_data_dir(data_dir,
use_existing_data_dir ? NULL : prov_connstr,
postgresql_conf, pg_hba_conf,
extra_basebackup_args);
snprintf(pid_file, MAXPGPATH, "%s/postmaster.pid", data_dir);
restore_point_name = generate_restore_point_name();
print_msg(VERBOSITY_NORMAL, _("Creating restore point \"%s\" on remote node ...\n"),
restore_point_name);
provider_conn = connectdb(prov_connstr);
remote_lsn = create_restore_point(provider_conn, restore_point_name);
PQfinish(provider_conn);
provider_conn = NULL;
/*
* Get subscriber db to consistent state (for lsn after slot creation).
*/
print_msg(VERBOSITY_NORMAL,
_("Bringing subscriber node to the restore point ...\n"));
if (recovery_conf)
{
#if PG_VERSION_NUM >= 120000
CopyConfFile(recovery_conf, "postgresql.auto.conf", true);
#else
CopyConfFile(recovery_conf, "recovery.conf", false);
#endif
}
else
{
#if PG_VERSION_NUM < 120000
appendPQExpBuffer(recoveryconfcontents, "standby_mode = 'on'\n");
#endif
appendPQExpBuffer(recoveryconfcontents, "primary_conninfo = '%s'\n",
escape_single_quotes_ascii(prov_connstr));
}
appendPQExpBuffer(recoveryconfcontents, "recovery_target_name = '%s'\n", restore_point_name);
appendPQExpBuffer(recoveryconfcontents, "recovery_target_inclusive = true\n");
#if PG_VERSION_NUM >= 90500
appendPQExpBuffer(recoveryconfcontents, "recovery_target_action = promote\n");
#else
appendPQExpBuffer(recoveryconfcontents, "pause_at_recovery_target = false\n");
#endif
WriteRecoveryConf(recoveryconfcontents);
free(restore_point_name);
restore_point_name = NULL;
/*
* Start subscriber node with pglogical disabled, and wait until it starts
* accepting connections which means it has caught up to the restore point.
*/
pg_ctl_ret = run_pg_ctl("start -l \"pglogical_create_subscriber_postgres.log\" -o \"-c shared_preload_libraries=''\"");
if (pg_ctl_ret != 0)
die(_("Postgres startup for restore point catchup failed with %d. See pglogical_create_subscriber_postgres.log."), pg_ctl_ret);
wait_primary_connection(sub_connstr);
/*
* Clean any per-node data that were copied by pg_basebackup.
*/
print_msg(VERBOSITY_VERBOSE,
_("Removing old pglogical configuration ...\n"));
for (dbnum = 0; dbnum < n_databases; dbnum++)
{
char *db = database_list[dbnum];
sub_connstr = get_connstr(base_sub_connstr, db);
if (!sub_connstr || !strlen(sub_connstr))
die(_("Subscriber connection string is not valid.\n"));
subscriber_conn = connectdb(sub_connstr);
remove_unwanted_data(subscriber_conn);
PQfinish(subscriber_conn);
subscriber_conn = NULL;
}
/* Stop Postgres so we can reset system id and start it with pglogical loaded. */
pg_ctl_ret = run_pg_ctl("stop");
if (pg_ctl_ret != 0)
die(_("Postgres stop after restore point catchup failed with %d. See pglogical_create_subscriber_postgres.log."), pg_ctl_ret);
wait_postmaster_shutdown();
/*
* Start the node again, now with pglogical active so that we can start the
* logical replication. This is final start, so don't log to to special log
* file anymore.
*/
print_msg(VERBOSITY_NORMAL,
_("Initializing pglogical on the subscriber node:\n"));
pg_ctl_ret = run_pg_ctl("start");
if (pg_ctl_ret != 0)
die(_("Postgres restart with pglogical enabled failed with %d."), pg_ctl_ret);
wait_postmaster_connection(base_sub_connstr);
for (dbnum = 0; dbnum < n_databases; dbnum++)
{
char *db = database_list[dbnum];
sub_connstr = get_connstr(base_sub_connstr, db);
prov_connstr = get_connstr(base_prov_connstr, db);
subscriber_conn = connectdb(sub_connstr);
/* Create the extension. */
print_msg(VERBOSITY_VERBOSE,
_("Creating pglogical extension for database %s...\n"), db);
if (PQserverVersion(subscriber_conn) < 90500)
install_extension(subscriber_conn, "pglogical_origin");
install_extension(subscriber_conn, "pglogical");
/*
* Create the identifier which is setup with the position to which we
* already caught up using physical replication.
*/
print_msg(VERBOSITY_VERBOSE,
_("Creating replication origin for database %s...\n"), db);
initialize_replication_origin(subscriber_conn, slot_names[dbnum], remote_lsn);
/*
* And finally add the node to the cluster.
*/
print_msg(VERBOSITY_NORMAL, _("Creating subscriber %s for database %s...\n"),
subscriber_name, db);
print_msg(VERBOSITY_VERBOSE, _("Replication sets: %s\n"), replication_sets);
pglogical_subscribe(subscriber_conn, subscriber_name, sub_connstr,
prov_connstr, replication_sets, apply_delay,
force_text_transfer);
PQfinish(subscriber_conn);
subscriber_conn = NULL;
}
/* If user does not want the node to be running at the end, stop it. */
if (stop)
{
print_msg(VERBOSITY_NORMAL, _("Stopping the subscriber node ...\n"));
pg_ctl_ret = run_pg_ctl("stop");
if (pg_ctl_ret != 0)
die(_("Stopping postgres after successful subscribtion failed with %d."), pg_ctl_ret);
wait_postmaster_shutdown();
}
print_msg(VERBOSITY_NORMAL, _("All done\n"));
return 0;
}
/*
* Print help.
*/
static void
usage(void)
{
printf(_("%s create new pglogical subscriber from basebackup of provider.\n\n"), progname);
printf(_("Usage:\n"));
printf(_(" %s [OPTION]...\n"), progname);
printf(_("\nGeneral options:\n"));
printf(_(" -D, --pgdata=DIRECTORY data directory to be used for new node,\n"));
printf(_(" can be either empty/non-existing directory,\n"));
printf(_(" or directory populated using\n"));
printf(_(" pg_basebackup -X stream command\n"));
printf(_(" --databases optional list of databases to replicate\n"));
printf(_(" -n, --subscriber-name=NAME name of the newly created subscriber\n"));
printf(_(" --subscriber-dsn=CONNSTR connection string to the newly created subscriber\n"));
printf(_(" --provider-dsn=CONNSTR connection string to the provider\n"));
printf(_(" --replication-sets=SETS comma separated list of replication set names\n"));
printf(_(" --apply-delay=DELAY apply delay in seconds (by default 0)\n"));
printf(_(" --drop-slot-if-exists drop replication slot of conflicting name\n"));
printf(_(" -s, --stop stop the server once the initialization is done\n"));
printf(_(" -v increase logging verbosity\n"));
printf(_(" --extra-basebackup-args additional arguments to pass to pg_basebackup.\n"));
printf(_(" Safe options: -T, -c, --xlogdir/--waldir\n"));
printf(_("\nConfiguration files override:\n"));
printf(_(" --hba-conf path to the new pg_hba.conf\n"));
printf(_(" --postgresql-conf path to the new postgresql.conf\n"));
printf(_(" --recovery-conf path to the template recovery configuration\n"));
}
/*
* Print error and exit.
*/
static void
die(const char *fmt,...)
{
va_list argptr;
va_start(argptr, fmt);
vfprintf(stderr, fmt, argptr);
va_end(argptr);
if (subscriber_conn)
PQfinish(subscriber_conn);
if (provider_conn)
PQfinish(provider_conn);
if (get_pgpid())
{
if (!run_pg_ctl("stop -s"))
{
fprintf(stderr, _("WARNING: postgres seems to be running, but could not be stopped\n"));
}
}
exit(1);
}
/*
* Print message to stdout and flush
*/
static void
print_msg(VerbosityLevelEnum level, const char *fmt,...)
{
if (verbosity >= level)
{
va_list argptr;
va_start(argptr, fmt);
vfprintf(stdout, fmt, argptr);
va_end(argptr);
fflush(stdout);
}
}
/*
* Start pg_ctl with given argument(s) - used to start/stop postgres
*
* Returns the exit code reported by pg_ctl. If pg_ctl exits due to a
* signal this call will die and not return.
*/
static int
run_pg_ctl(const char *arg)
{
int ret;
PQExpBuffer cmd = createPQExpBuffer();
char *exec_path = find_other_exec_or_die(argv0, "pg_ctl");
appendPQExpBuffer(cmd, "%s %s -D \"%s\"", exec_path, arg, data_dir);
/* Run pg_ctl in silent mode unless we run in debug mode. */
if (verbosity < VERBOSITY_DEBUG)
appendPQExpBuffer(cmd, " -s");
print_msg(VERBOSITY_DEBUG, _("Running pg_ctl: %s.\n"), cmd->data);
ret = system(cmd->data);
destroyPQExpBuffer(cmd);
if (WIFEXITED(ret))
return WEXITSTATUS(ret);
else if (WIFSIGNALED(ret))
die(_("pg_ctl exited with signal %d"), WTERMSIG(ret));
else
die(_("pg_ctl exited for an unknown reason (system() returned %d)"), ret);
return -1;
}
/*
* Run pg_basebackup to create the copy of the origin node.
*/
static void
run_basebackup(const char *provider_connstr, const char *data_dir,
const char *extra_basebackup_args)
{
int ret;
PQExpBuffer cmd = createPQExpBuffer();
char *exec_path = find_other_exec_or_die(argv0, "pg_basebackup");
appendPQExpBuffer(cmd, "%s -D \"%s\" -d \"%s\" -X s -P", exec_path, data_dir, provider_connstr);
/* Run pg_basebackup in verbose mode if we are running in verbose mode. */
if (verbosity >= VERBOSITY_VERBOSE)
appendPQExpBuffer(cmd, " -v");
if (extra_basebackup_args != NULL)
appendPQExpBuffer(cmd, "%s", extra_basebackup_args);
print_msg(VERBOSITY_DEBUG, _("Running pg_basebackup: %s.\n"), cmd->data);
ret = system(cmd->data);
destroyPQExpBuffer(cmd);
if (WIFEXITED(ret) && WEXITSTATUS(ret) == 0)
return;
if (WIFEXITED(ret))
die(_("pg_basebackup failed with exit status %d, cannot continue.\n"), WEXITSTATUS(ret));
else if (WIFSIGNALED(ret))
die(_("pg_basebackup exited with signal %d, cannot continue"), WTERMSIG(ret));
else
die(_("pg_basebackup exited for an unknown reason (system() returned %d)"), ret);
}
/*
* Init the datadir
*
* This function can either ensure provided datadir is a postgres datadir,
* or create it using pg_basebackup.
*
* In any case, new postresql.conf and pg_hba.conf will be copied to the
* datadir if they are provided.
*/
static void
initialize_data_dir(char *data_dir, char *connstr,
char *postgresql_conf, char *pg_hba_conf,
char *extra_basebackup_args)
{
if (connstr)
{
print_msg(VERBOSITY_NORMAL,
_("Creating base backup of the remote node...\n"));
run_basebackup(connstr, data_dir, extra_basebackup_args);
}
if (postgresql_conf)
CopyConfFile(postgresql_conf, "postgresql.conf", false);
if (pg_hba_conf)
CopyConfFile(pg_hba_conf, "pg_hba.conf", false);
}
/*
* This function checks if provided datadir is clone of the remote node
* described by the remote info, or if it's emtpy directory that can be used
* as new datadir.
*/
static bool
check_data_dir(char *data_dir, RemoteInfo *remoteinfo)
{
/* Run basebackup as needed. */
switch (pg_check_dir(data_dir))
{
case 0: /* Does not exist */
case 1: /* Exists, empty */
return false;
case 2:
case 3: /* Exists, not empty */
case 4:
{
if (!is_pg_dir(data_dir))
die(_("Directory \"%s\" exists but is not valid postgres data directory.\n"),
data_dir);
return true;
}
case -1: /* Access problem */
die(_("Could not access directory \"%s\": %s.\n"),
data_dir, strerror(errno));
}
/* Unreachable */
die(_("Unexpected result from pg_check_dir() call"));
return false;
}
/*
* Initialize replication slots
*/
static char *
initialize_replication_slot(PGconn *conn, char *dbname,
char *provider_node_name, char *subscription_name,
bool drop_slot_if_exists)
{
PQExpBufferData query;
char *slot_name;
PGresult *res;
/* Generate the slot name. */
initPQExpBuffer(&query);
printfPQExpBuffer(&query,
"SELECT pglogical.pglogical_gen_slot_name(%s, %s, %s)",
PQescapeLiteral(conn, dbname, strlen(dbname)),
PQescapeLiteral(conn, provider_node_name,
strlen(provider_node_name)),
PQescapeLiteral(conn, subscription_name,
strlen(subscription_name)));
res = PQexec(conn, query.data);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
die(_("Could generate slot name: %s"), PQerrorMessage(conn));
slot_name = pstrdup(PQgetvalue(res, 0, 0));
PQclear(res);
resetPQExpBuffer(&query);
/* Check if the current slot exists. */
printfPQExpBuffer(&query,
"SELECT 1 FROM pg_catalog.pg_replication_slots WHERE slot_name = %s",
PQescapeLiteral(conn, slot_name, strlen(slot_name)));
res = PQexec(conn, query.data);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
die(_("Could not fetch existing slot information: %s"), PQerrorMessage(conn));
/* Drop the existing slot when asked for it or error if it already exists. */
if (PQntuples(res) > 0)
{
PQclear(res);
resetPQExpBuffer(&query);
if (!drop_slot_if_exists)
die(_("Slot %s already exists, drop it or use --drop-slot-if-exists to drop it automatically.\n"),
slot_name);
print_msg(VERBOSITY_VERBOSE,
_("Droping existing slot %s ...\n"), slot_name);
printfPQExpBuffer(&query,
"SELECT pg_catalog.pg_drop_replication_slot(%s)",
PQescapeLiteral(conn, slot_name, strlen(slot_name)));
res = PQexec(conn, query.data);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
die(_("Could not drop existing slot %s: %s"), slot_name,
PQerrorMessage(conn));
}
PQclear(res);
resetPQExpBuffer(&query);
/* And finally, create the slot. */
appendPQExpBuffer(&query, "SELECT pg_create_logical_replication_slot(%s, '%s');",
PQescapeLiteral(conn, slot_name, strlen(slot_name)),
"pglogical_output");
res = PQexec(conn, query.data);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
die(_("Could not create replication slot, status %s: %s\n"),
PQresStatus(PQresultStatus(res)), PQresultErrorMessage(res));
}
PQclear(res);
termPQExpBuffer(&query);
return slot_name;
}
/*
* Read replication info about remote connection
*
* TODO: unify with pglogical_remote_node_info in pglogical_rpc
*/
static RemoteInfo *
get_remote_info(PGconn* conn)
{
RemoteInfo *ri = (RemoteInfo *)pg_malloc0(sizeof(RemoteInfo));
PGresult *res;
if (!extension_exists(conn, "pglogical"))
die(_("The remote node is not configured as a pglogical provider.\n"));
res = PQexec(conn, "SELECT node_id, node_name, sysid, dbname, replication_sets FROM pglogical.pglogical_node_info()");
if (PQresultStatus(res) != PGRES_TUPLES_OK)
die(_("could not fetch remote node info: %s\n"), PQerrorMessage(conn));
/* No nodes found? */
if (PQntuples(res) == 0)
die(_("The remote database is not configured as a pglogical node.\n"));
if (PQntuples(res) > 1)
die(_("The remote database has multiple nodes configured. That is not supported with current version of pglogical.\n"));
#define atooid(x) ((Oid) strtoul((x), NULL, 10))
ri->nodeid = atooid(PQgetvalue(res, 0, 0));
ri->node_name = pstrdup(PQgetvalue(res, 0, 1));
ri->sysid = pstrdup(PQgetvalue(res, 0, 2));
ri->dbname = pstrdup(PQgetvalue(res, 0, 3));
ri->replication_sets = pstrdup(PQgetvalue(res, 0, 4));
PQclear(res);
return ri;
}
/*
* Check if extension exists.
*/
static bool
extension_exists(PGconn *conn, const char *extname)
{
PQExpBuffer query = createPQExpBuffer();
PGresult *res;
bool ret;
printfPQExpBuffer(query, "SELECT 1 FROM pg_catalog.pg_extension WHERE extname = %s;",
PQescapeLiteral(conn, extname, strlen(extname)));
res = PQexec(conn, query->data);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
PQclear(res);
die(_("Could not read extension info: %s\n"), PQerrorMessage(conn));
}
ret = PQntuples(res) == 1;
PQclear(res);
destroyPQExpBuffer(query);
return ret;
}
/*
* Create extension.
*/
static void
install_extension(PGconn *conn, const char *extname)
{
PQExpBuffer query = createPQExpBuffer();
PGresult *res;
printfPQExpBuffer(query, "CREATE EXTENSION IF NOT EXISTS %s;",
PQescapeIdentifier(conn, extname, strlen(extname)));
res = PQexec(conn, query->data);
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
PQclear(res);
die(_("Could not install %s extension: %s\n"), extname, PQerrorMessage(conn));
}
PQclear(res);
destroyPQExpBuffer(query);
}
/*
* Clean all the data that was copied from remote node but we don't
* want it here (currently shared security labels and replication identifiers).
*/
static void
remove_unwanted_data(PGconn *conn)
{
PGresult *res;
/*
* Remove replication identifiers (9.4 will get them removed by dropping
* the extension later as we emulate them there).
*/
if (PQserverVersion(conn) >= 90500)
{
res = PQexec(conn, "SELECT pg_replication_origin_drop(external_id) FROM pg_replication_origin_status;");
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
PQclear(res);
die(_("Could not remove existing replication origins: %s\n"), PQerrorMessage(conn));
}
PQclear(res);
}
res = PQexec(conn, "DROP EXTENSION pglogical CASCADE;");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
die(_("Could not clean the pglogical extension, status %s: %s\n"),
PQresStatus(PQresultStatus(res)), PQresultErrorMessage(res));
}
PQclear(res);
}
/*