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repmgr/repmgr-client-global.h
Ian Barwick 2491b8ae52 Add functionality to "pause" repmgrd 
In some circumstances, e.g. while performing a switchover, it is essential
that repmgrd does not take any kind of failover action, as this will put
the cluster into an incorrect state.

Previously it was necessary to stop repmgrd on all nodes (or at least
those nodes which repmgrd would consider as promotion candidates), however
this is a cumbersome and potentially risk-prone operation, particularly if the
replication cluster contains more than a couple of servers.

To prevent this issue from occurring, this patch introduces the ability
to "pause" repmgrd on all nodes wth a single command ("repmgr daemon pause")
which notifies repmgrd not to take any failover action until the node
is "unpaused" ("repmgr daemon unpause").

"repmgr daemon status" provides an overview of each node and whether repmgrd
is running, and if so whether it is paused.

"repmgr standby switchover" has been modified to automatically pause repmgrd
while carrying out the switchover.

See documentation for further details.
2018-09-27 16:42:10 +09:00

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/*
* repmgr-client-global.h
* Copyright (c) 2ndQuadrant, 2010-2018
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _REPMGR_CLIENT_GLOBAL_H_
#define _REPMGR_CLIENT_GLOBAL_H_
#include "configfile.h"
/* values for --copy-external-config-files */
#define CONFIG_FILE_SAMEPATH 1
#define CONFIG_FILE_PGDATA 2
/* default value for "cluster event --limit"*/
#define CLUSTER_EVENT_LIMIT 20
typedef struct
{
/* configuration metadata */
bool conninfo_provided;
bool connection_param_provided;
bool host_param_provided;
bool limit_provided;
/* general configuration options */
char config_file[MAXPGPATH];
bool dry_run;
bool force;
char pg_bindir[MAXLEN]; /* overrides setting in repmgr.conf */
bool wait;
bool no_wait;
/* logging options */
char log_level[MAXLEN]; /* overrides setting in repmgr.conf */
bool log_to_file;
bool quiet;
bool terse;
bool verbose;
/* output options */
bool csv;
bool nagios;
bool optformat;
/* standard connection options */
char dbname[MAXLEN];
char host[MAXLEN];
char username[MAXLEN];
char port[MAXLEN];
/* other connection options */
char remote_user[MAXLEN];
char superuser[MAXLEN];
/* general node options */
int node_id;
char node_name[MAXLEN];
char data_dir[MAXPGPATH];
int remote_node_id;
/* "standby clone" options */
bool copy_external_config_files;
int copy_external_config_files_destination;
bool fast_checkpoint;
bool rsync_only;
bool no_upstream_connection;
char recovery_min_apply_delay[MAXLEN];
char replication_user[MAXLEN];
char upstream_conninfo[MAXLEN];
bool without_barman;
bool recovery_conf_only;
/* "standby clone"/"standby follow" options */
int upstream_node_id;
/* "standby register" options */
bool wait_register_sync;
int wait_register_sync_seconds;
int wait_start;
/* "standby switchover" options */
bool always_promote;
bool force_rewind_used;
char force_rewind_path[MAXPGPATH];
bool siblings_follow;
bool repmgrd_no_pause;
/* "node status" options */
bool is_shutdown_cleanly;
/* "node check" options */
bool archive_ready;
bool downstream;
bool replication_lag;
bool role;
bool slots;
bool missing_slots;
bool has_passfile;
bool replication_connection;
/* "node join" options */
char config_files[MAXLEN];
/* "node service" options */
char action[MAXLEN];
bool check;
bool list_actions;
bool checkpoint;
/* "cluster event" options */
bool all;
char event[MAXLEN];
int limit;
/* "cluster cleanup" options */
int keep_history;
/* following options for internal use */
char config_archive_dir[MAXPGPATH];
OutputMode output_mode;
} t_runtime_options;
#define T_RUNTIME_OPTIONS_INITIALIZER { \
/* configuration metadata */ \
false, false, false, false, \
/* general configuration options */ \
"", false, false, "", false, false, \
/* logging options */ \
"", false, false, false, false, \
/* output options */ \
false, false, false, \
/* database connection options */ \
"", "", "", "", \
/* other connection options */ \
"", "", \
/* general node options */ \
UNKNOWN_NODE_ID, "", "", UNKNOWN_NODE_ID, \
/* "standby clone" options */ \
false, CONFIG_FILE_SAMEPATH, false, false, false, "", "", "", \
false, false, \
/* "standby clone"/"standby follow" options */ \
NO_UPSTREAM_NODE, \
/* "standby register" options */ \
false, -1, DEFAULT_WAIT_START, \
/* "standby switchover" options */ \
false, false, "", false, false, \
/* "node status" options */ \
false, \
/* "node check" options */ \
false, false, false, false, false, false, false, false, \
/* "node join" options */ \
"", \
/* "node service" options */ \
"", false, false, false, \
/* "cluster event" options */ \
false, "", CLUSTER_EVENT_LIMIT, \
/* "cluster cleanup" options */ \
0, \
/* following options for internal use */ \
"/tmp", OM_TEXT \
}
typedef enum
{
barman,
pg_basebackup
} standy_clone_mode;
typedef enum
{
ACTION_UNKNOWN = -1,
ACTION_NONE,
ACTION_START,
ACTION_STOP,
ACTION_STOP_WAIT,
ACTION_RESTART,
ACTION_RELOAD,
ACTION_PROMOTE
} t_server_action;
typedef struct ColHeader
{
char title[MAXLEN];
int max_length;
int cur_length;
} ColHeader;
/* global configuration structures */
extern t_runtime_options runtime_options;
extern t_configuration_options config_file_options;
t_conninfo_param_list source_conninfo;
extern bool config_file_required;
extern char pg_bindir[MAXLEN];
extern t_node_info target_node_info;
extern int check_server_version(PGconn *conn, char *server_type, bool exit_on_error, char *server_version_string);
extern void check_93_config(void);
extern bool create_repmgr_extension(PGconn *conn);
extern int test_ssh_connection(char *host, char *remote_user);
extern bool local_command(const char *command, PQExpBufferData *outputbuf);
extern bool local_command_simple(const char *command, PQExpBufferData *outputbuf);
extern standy_clone_mode get_standby_clone_mode(void);
extern int copy_remote_files(char *host, char *remote_user, char *remote_path,
char *local_path, bool is_directory, int server_version_num);
extern void print_error_list(ItemList *error_list, int log_level);
extern char *make_pg_path(const char *file);
extern void get_superuser_connection(PGconn **conn, PGconn **superuser_conn, PGconn **privileged_conn);
extern bool remote_command(const char *host, const char *user, const char *command, PQExpBufferData *outputbuf);
extern void make_remote_repmgr_path(PQExpBufferData *outputbuf, t_node_info *remote_node_record);
/* display functions */
extern void print_help_header(void);
extern void print_status_header(int cols, ColHeader *headers);
/* server control functions */
extern void get_server_action(t_server_action action, char *script, char *data_dir);
extern bool data_dir_required_for_action(t_server_action action);
extern void get_node_config_directory(char *config_dir_buf);
extern void get_node_data_directory(char *data_dir_buf);
extern void init_node_record(t_node_info *node_record);
extern bool can_use_pg_rewind(PGconn *conn, const char *data_directory, PQExpBufferData *reason);
extern void drop_replication_slot_if_exists(PGconn *conn, int node_id, char *slot_name);
#endif /* _REPMGR_CLIENT_GLOBAL_H_ */
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