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repmgr-action-cluster.c
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repmgr-action-cluster.c
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/*
* repmgr-action-cluster.c
*
* Implements cluster information actions for the repmgr command line utility
*
* Copyright (c) EnterpriseDB Corporation, 2010-2021
*
* 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/>.
*/
#include "repmgr.h"
#include "compat.h"
#include "repmgr-client-global.h"
#include "repmgr-action-cluster.h"
#define SHOW_HEADER_COUNT 9
typedef enum
{
SHOW_ID = 0,
SHOW_NAME,
SHOW_ROLE,
SHOW_STATUS,
SHOW_UPSTREAM_NAME,
SHOW_LOCATION,
SHOW_PRIORITY,
SHOW_TIMELINE_ID,
SHOW_CONNINFO
} ShowHeader;
#define EVENT_HEADER_COUNT 6
typedef enum
{
EV_NODE_ID = 0,
EV_NODE_NAME,
EV_EVENT,
EV_SUCCESS,
EV_TIMESTAMP,
EV_DETAILS
} EventHeader;
struct ColHeader headers_show[SHOW_HEADER_COUNT];
struct ColHeader headers_event[EVENT_HEADER_COUNT];
static int build_cluster_matrix(t_node_matrix_rec ***matrix_rec_dest, ItemList *warnings, int *error_code);
static int build_cluster_crosscheck(t_node_status_cube ***cube_dest, ItemList *warnings, int *error_code);
static void cube_set_node_status(t_node_status_cube **cube, int n, int node_id, int matrix_node_id, int connection_node_id, int connection_status);
/*
* CLUSTER SHOW
*
* Parameters:
* --compact
* --csv
* --terse
* --verbose
*/
void
do_cluster_show(void)
{
PGconn *conn = NULL;
NodeInfoList nodes = T_NODE_INFO_LIST_INITIALIZER;
NodeInfoListCell *cell = NULL;
int i = 0;
ItemList warnings = {NULL, NULL};
bool success = false;
bool error_found = false;
bool connection_error_found = false;
/* Connect to local database to obtain cluster connection data */
log_verbose(LOG_INFO, _("connecting to database"));
if (strlen(config_file_options.conninfo))
conn = establish_db_connection(config_file_options.conninfo, true);
else
conn = establish_db_connection_by_params(&source_conninfo, true);
success = get_all_node_records_with_upstream(conn, &nodes);
if (success == false)
{
/* get_all_node_records_with_upstream() will print error message */
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
if (nodes.node_count == 0)
{
log_error(_("no node records were found"));
log_hint(_("ensure at least one node is registered"));
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
/* Initialize column headers */
strncpy(headers_show[SHOW_ID].title, _("ID"), MAXLEN);
strncpy(headers_show[SHOW_NAME].title, _("Name"), MAXLEN);
strncpy(headers_show[SHOW_ROLE].title, _("Role"), MAXLEN);
strncpy(headers_show[SHOW_STATUS].title, _("Status"), MAXLEN);
strncpy(headers_show[SHOW_UPSTREAM_NAME].title, _("Upstream"), MAXLEN);
strncpy(headers_show[SHOW_LOCATION].title, _("Location"), MAXLEN);
if (runtime_options.compact == true)
{
strncpy(headers_show[SHOW_PRIORITY].title, _("Prio."), MAXLEN);
strncpy(headers_show[SHOW_TIMELINE_ID].title, _("TLI"), MAXLEN);
}
else
{
strncpy(headers_show[SHOW_PRIORITY].title, _("Priority"), MAXLEN);
strncpy(headers_show[SHOW_TIMELINE_ID].title, _("Timeline"), MAXLEN);
}
strncpy(headers_show[SHOW_CONNINFO].title, _("Connection string"), MAXLEN);
/*
* NOTE: if repmgr is ever localized into non-ASCII locales, use
* pg_wcssize() or similar to establish printed column length
*/
for (i = 0; i < SHOW_HEADER_COUNT; i++)
{
headers_show[i].display = true;
/* Don't display timeline on pre-9.6 clusters */
if (i == SHOW_TIMELINE_ID)
{
if (PQserverVersion(conn) < 90600)
{
headers_show[i].display = false;
}
}
/* if --compact provided, don't display conninfo */
if (runtime_options.compact == true)
{
if (i == SHOW_CONNINFO)
{
headers_show[i].display = false;
}
}
if (headers_show[i].display == true)
{
headers_show[i].max_length = strlen(headers_show[i].title);
}
}
/*
* TODO: count nodes marked as "? unreachable" and add a hint about
* the other cluster commands for better determining whether
* unreachable.
*/
for (cell = nodes.head; cell; cell = cell->next)
{
PQExpBufferData node_status;
PQExpBufferData upstream;
PQExpBufferData buf;
cell->node_info->replication_info = palloc0(sizeof(ReplInfo));
if (cell->node_info->replication_info == NULL)
{
log_error(_("unable to allocate memory"));
exit(ERR_INTERNAL);
}
init_replication_info(cell->node_info->replication_info);
cell->node_info->conn = establish_db_connection_quiet(cell->node_info->conninfo);
if (PQstatus(cell->node_info->conn) != CONNECTION_OK)
{
connection_error_found = true;
if (runtime_options.verbose)
{
char error[MAXLEN];
strncpy(error, PQerrorMessage(cell->node_info->conn), MAXLEN);
item_list_append_format(&warnings,
"when attempting to connect to node \"%s\" (ID: %i), following error encountered :\n\"%s\"",
cell->node_info->node_name, cell->node_info->node_id, trim(error));
}
else
{
item_list_append_format(&warnings,
"unable to connect to node \"%s\" (ID: %i)",
cell->node_info->node_name, cell->node_info->node_id);
}
}
else
{
/* NOP on pre-9.6 servers */
cell->node_info->replication_info->timeline_id = get_node_timeline(cell->node_info->conn,
cell->node_info->replication_info->timeline_id_str);
}
initPQExpBuffer(&node_status);
initPQExpBuffer(&upstream);
if (format_node_status(cell->node_info, &node_status, &upstream, &warnings) == true)
error_found = true;
snprintf(cell->node_info->details, sizeof(cell->node_info->details),
"%s", node_status.data);
snprintf(cell->node_info->upstream_node_name, sizeof(cell->node_info->upstream_node_name),
"%s", upstream.data);
termPQExpBuffer(&node_status);
termPQExpBuffer(&upstream);
PQfinish(cell->node_info->conn);
cell->node_info->conn = NULL;
initPQExpBuffer(&buf);
appendPQExpBuffer(&buf, "%i", cell->node_info->node_id);
headers_show[SHOW_ID].cur_length = strlen(buf.data);
termPQExpBuffer(&buf);
headers_show[SHOW_ROLE].cur_length = strlen(get_node_type_string(cell->node_info->type));
headers_show[SHOW_NAME].cur_length = strlen(cell->node_info->node_name);
headers_show[SHOW_STATUS].cur_length = strlen(cell->node_info->details);
headers_show[SHOW_UPSTREAM_NAME].cur_length = strlen(cell->node_info->upstream_node_name);
initPQExpBuffer(&buf);
appendPQExpBuffer(&buf, "%i", cell->node_info->priority);
headers_show[SHOW_PRIORITY].cur_length = strlen(buf.data);
termPQExpBuffer(&buf);
headers_show[SHOW_LOCATION].cur_length = strlen(cell->node_info->location);
/* Format timeline ID */
if (cell->node_info->type == WITNESS)
{
/* The witness node's timeline ID is irrelevant */
strncpy(cell->node_info->replication_info->timeline_id_str, _("n/a"), MAXLEN);
}
headers_show[SHOW_TIMELINE_ID].cur_length = strlen(cell->node_info->replication_info->timeline_id_str);
headers_show[SHOW_CONNINFO].cur_length = strlen(cell->node_info->conninfo);
for (i = 0; i < SHOW_HEADER_COUNT; i++)
{
if (runtime_options.compact == true)
{
if (headers_show[i].display == false)
continue;
}
if (headers_show[i].cur_length > headers_show[i].max_length)
{
headers_show[i].max_length = headers_show[i].cur_length;
}
}
}
/* Print column header row (text mode only) */
if (runtime_options.output_mode == OM_TEXT)
{
print_status_header(SHOW_HEADER_COUNT, headers_show);
}
for (cell = nodes.head; cell; cell = cell->next)
{
if (runtime_options.output_mode == OM_CSV)
{
int connection_status = (cell->node_info->node_status == NODE_STATUS_UP) ? 0 : -1;
int recovery_type = RECTYPE_UNKNOWN;
/*
* here we explicitly convert the RecoveryType to integer values
* to avoid implicit dependency on the values in the enum
*/
switch (cell->node_info->recovery_type)
{
case RECTYPE_UNKNOWN:
recovery_type = -1;
break;
case RECTYPE_PRIMARY:
recovery_type = 0;
break;
case RECTYPE_STANDBY:
recovery_type = 1;
break;
}
printf("%i,%i,%i\n",
cell->node_info->node_id,
connection_status,
recovery_type);
}
else
{
printf(" %-*i ", headers_show[SHOW_ID].max_length, cell->node_info->node_id);
printf("| %-*s ", headers_show[SHOW_NAME].max_length, cell->node_info->node_name);
printf("| %-*s ", headers_show[SHOW_ROLE].max_length, get_node_type_string(cell->node_info->type));
printf("| %-*s ", headers_show[SHOW_STATUS].max_length, cell->node_info->details);
printf("| %-*s ", headers_show[SHOW_UPSTREAM_NAME].max_length, cell->node_info->upstream_node_name);
printf("| %-*s ", headers_show[SHOW_LOCATION].max_length, cell->node_info->location);
printf("| %-*i ", headers_show[SHOW_PRIORITY].max_length, cell->node_info->priority);
if (headers_show[SHOW_TIMELINE_ID].display == true)
{
printf("| %-*s ", headers_show[SHOW_TIMELINE_ID].max_length, cell->node_info->replication_info->timeline_id_str);
}
if (headers_show[SHOW_CONNINFO].display == true)
{
printf("| %-*s", headers_show[SHOW_CONNINFO].max_length, cell->node_info->conninfo);
}
puts("");
}
}
clear_node_info_list(&nodes);
PQfinish(conn);
/* emit any warnings */
if (warnings.head != NULL && runtime_options.terse == false && runtime_options.output_mode != OM_CSV)
{
ItemListCell *cell = NULL;
PQExpBufferData warning;
initPQExpBuffer(&warning);
appendPQExpBufferStr(&warning,
_("following issues were detected\n"));
for (cell = warnings.head; cell; cell = cell->next)
{
appendPQExpBuffer(&warning,
_(" - %s\n"), cell->string);
}
puts("");
log_warning("%s", warning.data);
termPQExpBuffer(&warning);
if (runtime_options.verbose == false && connection_error_found == true)
{
log_hint(_("execute with --verbose option to see connection error messages"));
}
}
/*
* If warnings were noted, even if they're not displayed (e.g. in --csv node),
* that means something's not right so we need to emit a non-zero exit code.
*/
if (warnings.head != NULL)
{
error_found = true;
}
if (error_found == true)
{
exit(ERR_NODE_STATUS);
}
}
/*
* CLUSTER EVENT
*
* Parameters:
* --limit[=20]
* --all
* --node-[id|name]
* --event
* --csv
* --compact
*/
void
do_cluster_event(void)
{
PGconn *conn = NULL;
PGresult *res;
int i = 0;
int column_count = EVENT_HEADER_COUNT;
conn = establish_db_connection(config_file_options.conninfo, true);
res = get_event_records(conn,
runtime_options.node_id,
runtime_options.node_name,
runtime_options.event,
runtime_options.all,
runtime_options.limit);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_error(_("unable to execute event query:\n %s"),
PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
exit(ERR_DB_QUERY);
}
if (PQntuples(res) == 0)
{
/* print this message directly, rather than as a log line */
printf(_("no matching events found\n"));
PQclear(res);
PQfinish(conn);
return;
}
strncpy(headers_event[EV_NODE_ID].title, _("Node ID"), MAXLEN);
strncpy(headers_event[EV_NODE_NAME].title, _("Name"), MAXLEN);
strncpy(headers_event[EV_EVENT].title, _("Event"), MAXLEN);
strncpy(headers_event[EV_SUCCESS].title, _("OK"), MAXLEN);
strncpy(headers_event[EV_TIMESTAMP].title, _("Timestamp"), MAXLEN);
strncpy(headers_event[EV_DETAILS].title, _("Details"), MAXLEN);
/*
* If --compact or --csv provided, simply omit the "Details" column.
* In --csv mode we'd need to quote/escape the contents "Details" column,
* which is doable but which will remain a TODO for now.
*/
if (runtime_options.compact == true || runtime_options.output_mode == OM_CSV)
column_count --;
for (i = 0; i < column_count; i++)
{
headers_event[i].max_length = strlen(headers_event[i].title);
}
for (i = 0; i < PQntuples(res); i++)
{
int j;
for (j = 0; j < column_count; j++)
{
headers_event[j].cur_length = strlen(PQgetvalue(res, i, j));
if (headers_event[j].cur_length > headers_event[j].max_length)
{
headers_event[j].max_length = headers_event[j].cur_length;
}
}
}
if (runtime_options.output_mode == OM_TEXT)
{
for (i = 0; i < column_count; i++)
{
if (i == 0)
printf(" ");
else
printf(" | ");
printf("%-*s",
headers_event[i].max_length,
headers_event[i].title);
}
printf("\n");
printf("-");
for (i = 0; i < column_count; i++)
{
int j;
for (j = 0; j < headers_event[i].max_length; j++)
printf("-");
if (i < (column_count - 1))
printf("-+-");
else
printf("-");
}
printf("\n");
}
for (i = 0; i < PQntuples(res); i++)
{
int j;
if (runtime_options.output_mode == OM_CSV)
{
for (j = 0; j < column_count; j++)
{
printf("%s", PQgetvalue(res, i, j));
if ((j + 1) < column_count)
{
printf(",");
}
}
}
else
{
printf(" ");
for (j = 0; j < column_count; j++)
{
printf("%-*s",
headers_event[j].max_length,
PQgetvalue(res, i, j));
if (j < (column_count - 1))
printf(" | ");
}
}
printf("\n");
}
PQclear(res);
PQfinish(conn);
if (runtime_options.output_mode == OM_TEXT)
puts("");
}
void
do_cluster_crosscheck(void)
{
int i = 0,
n = 0;
t_node_status_cube **cube;
bool connection_error_found = false;
int error_code = SUCCESS;
ItemList warnings = {NULL, NULL};
n = build_cluster_crosscheck(&cube, &warnings, &error_code);
if (runtime_options.output_mode == OM_CSV)
{
for (i = 0; i < n; i++)
{
int j;
for (j = 0; j < n; j++)
{
int max_node_status = -2;
int node_ix = 0;
for (node_ix = 0; node_ix < n; node_ix++)
{
int node_status = cube[node_ix]->matrix_list_rec[i]->node_status_list[j]->node_status;
if (node_status > max_node_status)
max_node_status = node_status;
}
printf("%i,%i,%i\n",
cube[i]->node_id,
cube[j]->node_id,
max_node_status);
if (max_node_status == -1)
{
connection_error_found = true;
}
}
}
}
else
{
/* output header contains node name, node ID and one column for each node in the cluster */
struct ColHeader *headers_crosscheck = NULL;
int header_count = n + 2;
int header_id = 2;
headers_crosscheck = palloc0(sizeof(ColHeader) * header_count);
/* Initialize column headers */
strncpy(headers_crosscheck[0].title, _("Name"), MAXLEN);
strncpy(headers_crosscheck[1].title, _("ID"), MAXLEN);
for (i = 0; i < n; i++)
{
maxlen_snprintf(headers_crosscheck[header_id].title, "%i", cube[i]->node_id);
header_id++;
}
/* Initialize column max values */
for (i = 0; i < header_count; i++)
{
headers_crosscheck[i].display = true;
headers_crosscheck[i].max_length = strlen(headers_crosscheck[i].title);
headers_crosscheck[i].cur_length = headers_crosscheck[i].max_length;
/* We can derive the maximum node ID length for the ID column from
* the generated matrix node ID headers
*/
if (i >= 2 && headers_crosscheck[i].max_length > headers_crosscheck[1].max_length)
headers_crosscheck[1].max_length = headers_crosscheck[i].max_length;
}
for (i = 0; i < n; i++)
{
if (strlen(cube[i]->node_name) > headers_crosscheck[0].max_length)
{
headers_crosscheck[0].max_length = strlen(cube[i]->node_name);
}
}
print_status_header(header_count, headers_crosscheck);
for (i = 0; i < n; i++)
{
int column_node_ix;
printf(" %-*s | %-*i ",
headers_crosscheck[0].max_length,
cube[i]->node_name,
headers_crosscheck[1].max_length,
cube[i]->node_id);
for (column_node_ix = 0; column_node_ix < n; column_node_ix++)
{
int max_node_status = -2;
int node_ix = 0;
char c;
/*
* The value of entry (i,j) is equal to the maximum value of all
* the (i,j,k). Indeed:
*
* - if one of the (i,j,k) is 0 (node up), then 0 (the node is
* up);
*
* - if the (i,j,k) are either -1 (down) or -2 (unknown), then -1
* (the node is down);
*
* - if all the (i,j,k) are -2 (unknown), then -2 (the node is in
* an unknown state).
*/
for (node_ix = 0; node_ix < n; node_ix++)
{
int node_status = cube[node_ix]->matrix_list_rec[i]->node_status_list[column_node_ix]->node_status;
if (node_status > max_node_status)
max_node_status = node_status;
}
switch (max_node_status)
{
case -2:
c = '?';
break;
case -1:
c = 'x';
connection_error_found = true;
break;
case 0:
c = '*';
break;
default:
log_error("unexpected node status value %i", max_node_status);
exit(ERR_INTERNAL);
}
printf("| %-*c ", headers_crosscheck[column_node_ix + 2].max_length, c);
}
printf("\n");
}
pfree(headers_crosscheck);
if (warnings.head != NULL && runtime_options.terse == false)
{
log_warning(_("following problems detected:"));
print_item_list(&warnings);
}
}
/* clean up allocated cube array */
{
int h,
j;
for (h = 0; h < n; h++)
{
for (i = 0; i < n; i++)
{
for (j = 0; j < n; j++)
{
free(cube[h]->matrix_list_rec[i]->node_status_list[j]);
}
free(cube[h]->matrix_list_rec[i]->node_status_list);
free(cube[h]->matrix_list_rec[i]);
}
free(cube[h]->matrix_list_rec);
free(cube[h]);
}
free(cube);
}
/* errors detected by build_cluster_crosscheck() have priority */
if (connection_error_found == true)
{
error_code = ERR_NODE_STATUS;
}
exit(error_code);
}
/*
* CLUSTER MATRIX
*
* Parameters:
* --csv
*/
void
do_cluster_matrix()
{
int i = 0,
j = 0,
n = 0;
t_node_matrix_rec **matrix_rec_list;
bool connection_error_found = false;
int error_code = SUCCESS;
ItemList warnings = {NULL, NULL};
n = build_cluster_matrix(&matrix_rec_list, &warnings, &error_code);
if (runtime_options.output_mode == OM_CSV)
{
for (i = 0; i < n; i++)
{
for (j = 0; j < n; j++)
{
printf("%d,%d,%d\n",
matrix_rec_list[i]->node_id,
matrix_rec_list[i]->node_status_list[j]->node_id,
matrix_rec_list[i]->node_status_list[j]->node_status);
if (matrix_rec_list[i]->node_status_list[j]->node_status == -2
|| matrix_rec_list[i]->node_status_list[j]->node_status == -1)
{
connection_error_found = true;
}
}
}
}
else
{
/* output header contains node name, node ID and one column for each node in the cluster */
struct ColHeader *headers_matrix = NULL;
int header_count = n + 2;
int header_id = 2;
headers_matrix = palloc0(sizeof(ColHeader) * header_count);
/* Initialize column headers */
strncpy(headers_matrix[0].title, _("Name"), MAXLEN);
strncpy(headers_matrix[1].title, _("ID"), MAXLEN);
for (i = 0; i < n; i++)
{
maxlen_snprintf(headers_matrix[header_id].title, "%i", matrix_rec_list[i]->node_id);
header_id++;
}
/* Initialize column max values */
for (i = 0; i < header_count; i++)
{
headers_matrix[i].display = true;
headers_matrix[i].max_length = strlen(headers_matrix[i].title);
headers_matrix[i].cur_length = headers_matrix[i].max_length;
/* We can derive the maximum node ID length for the ID column from
* the generated matrix node ID headers
*/
if (i >= 2 && headers_matrix[i].max_length > headers_matrix[1].max_length)
headers_matrix[1].max_length = headers_matrix[i].max_length;
}
for (i = 0; i < n; i++)
{
if (strlen(matrix_rec_list[i]->node_name) > headers_matrix[0].max_length)
{
headers_matrix[0].max_length = strlen(matrix_rec_list[i]->node_name);
}
}
print_status_header(header_count, headers_matrix);
for (i = 0; i < n; i++)
{
printf(" %-*s | %-*i ",
headers_matrix[0].max_length,
matrix_rec_list[i]->node_name,
headers_matrix[1].max_length,
matrix_rec_list[i]->node_id);
for (j = 0; j < n; j++)
{
char c;
switch (matrix_rec_list[i]->node_status_list[j]->node_status)
{
case -2:
c = '?';
break;
case -1:
c = 'x';
connection_error_found = true;
break;
case 0:
c = '*';
break;
default:
log_error("unexpected node status value %i", matrix_rec_list[i]->node_status_list[j]->node_status);
exit(ERR_INTERNAL);
}
printf("| %-*c ", headers_matrix[j + 2].max_length, c);
}
printf("\n");
}
pfree(headers_matrix);
if (warnings.head != NULL && runtime_options.terse == false)
{
log_warning(_("following problems detected:"));
print_item_list(&warnings);
}
}
for (i = 0; i < n; i++)
{
for (j = 0; j < n; j++)
{
free(matrix_rec_list[i]->node_status_list[j]);
}
free(matrix_rec_list[i]->node_status_list);
free(matrix_rec_list[i]);
}
free(matrix_rec_list);
/* actual database connection errors have priority */
if (connection_error_found == true)
{
error_code = ERR_NODE_STATUS;
}
exit(error_code);
}
static void
matrix_set_node_status(t_node_matrix_rec **matrix_rec_list, int n, int node_id, int connection_node_id, int connection_status)
{
int i,
j;
for (i = 0; i < n; i++)
{
if (matrix_rec_list[i]->node_id == node_id)
{
for (j = 0; j < n; j++)
{
if (matrix_rec_list[i]->node_status_list[j]->node_id == connection_node_id)
{
matrix_rec_list[i]->node_status_list[j]->node_status = connection_status;
break;
}
}
break;
}
}
}
static int
build_cluster_matrix(t_node_matrix_rec ***matrix_rec_dest, ItemList *warnings, int *error_code)
{
PGconn *conn = NULL;
int i = 0,
j = 0;
int local_node_id = UNKNOWN_NODE_ID;
int node_count = 0;
NodeInfoList nodes = T_NODE_INFO_LIST_INITIALIZER;
NodeInfoListCell *cell = NULL;
PQExpBufferData command;
PQExpBufferData command_output;
t_node_matrix_rec **matrix_rec_list;
/* obtain node list from the database */
log_info(_("connecting to database"));
if (strlen(config_file_options.conninfo))
{
conn = establish_db_connection(config_file_options.conninfo, true);
local_node_id = config_file_options.node_id;
}
else
{
conn = establish_db_connection_by_params(&source_conninfo, true);
local_node_id = runtime_options.node_id;
}
if (get_all_node_records(conn, &nodes) == false)
{
/* get_all_node_records() will display the error */
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
PQfinish(conn);
conn = NULL;
if (nodes.node_count == 0)
{
log_error(_("unable to retrieve any node records"));
exit(ERR_BAD_CONFIG);
}
/*
* Allocate an empty matrix record list
*
* -2 == NULL ? -1 == Error x 0 == OK
*/
matrix_rec_list = (t_node_matrix_rec **) pg_malloc0(sizeof(t_node_matrix_rec) * nodes.node_count);
i = 0;
/* Initialise matrix structure for each node */
for (cell = nodes.head; cell; cell = cell->next)
{
NodeInfoListCell *cell_j;
matrix_rec_list[i] = (t_node_matrix_rec *) pg_malloc0(sizeof(t_node_matrix_rec));
matrix_rec_list[i]->node_id = cell->node_info->node_id;
strncpy(matrix_rec_list[i]->node_name,
cell->node_info->node_name,
sizeof(matrix_rec_list[i]->node_name));
matrix_rec_list[i]->node_status_list = (t_node_status_rec **) pg_malloc0(sizeof(t_node_status_rec) * nodes.node_count);
j = 0;
for (cell_j = nodes.head; cell_j; cell_j = cell_j->next)
{
matrix_rec_list[i]->node_status_list[j] = (t_node_status_rec *) pg_malloc0(sizeof(t_node_status_rec));
matrix_rec_list[i]->node_status_list[j]->node_id = cell_j->node_info->node_id;
matrix_rec_list[i]->node_status_list[j]->node_status = -2; /* default unknown */
j++;
}
i++;
}
/* Fetch `repmgr cluster show --csv` output for each node */
i = 0;
for (cell = nodes.head; cell; cell = cell->next)
{
int connection_status = 0;
t_conninfo_param_list remote_conninfo = T_CONNINFO_PARAM_LIST_INITIALIZER;
char *host = NULL,
*p = NULL;
int connection_node_id = cell->node_info->node_id;
int x,
y;
PGconn *node_conn = NULL;