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/* Copyright (c) 2019-2020, Codership Oy. All rights reserved.
*
* 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; version 2 of the License.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "stats.h"
#include "log.h"
#include <assert.h>
#include <errno.h>
#include <stdio.h> // snprintf()
#include <stdlib.h> // abort()
#include <string.h> // strcmp()
#include <unistd.h> // usleep()
enum
{
STATS_REPL_BYTE,
STATS_REPL_WS,
STATS_RECV_BYTE,
STATS_RECV_WS,
STATS_TOTAL_BYTE,
STATS_TOTAL_WS,
STATS_CERT_FAILS,
STATS_STORE_FAILS,
STATS_FC_PAUSED,
STATS_MAX
};
static const char* const stats_legend[STATS_MAX] =
{
" repl(B/s)",
" repl(W/s)",
" recv(B/s)",
" recv(W/s)",
"total(B/s)",
"total(W/s)",
" cert.fail",
" stor.fail",
" paused(%)"
};
/* stats IDs in provider output - provider dependent, here we use Galera's */
static const char* const galera_ids[STATS_MAX] =
{
"replicated_bytes", /**< STATS_REPL_BYTE */
"replicated", /**< STATS_REPL_WS */
"received_bytes", /**< STATS_RECV_BYTE */
"received", /**< STATS_RECV_WS */
"", /**< STATS_TOTAL_BYTE */
"", /**< STATS_TOTAL_WS */
"local_cert_failures", /**< STATS_CERT_FAILS */
"", /**< STATS_STORE_FAILS */
"flow_control_paused_ns" /**< STATS_FC_PAUSED */
};
/* maps local stats IDs to provider stat IDs */
static int stats_galera_map[STATS_MAX];
/**
* Helper to map provider stats to own stats set */
static void
stats_establish_mapping(wsrep_t* const wsrep)
{
int const magic_map = -1;
size_t i;
for (i = 0; i < sizeof(stats_galera_map)/sizeof(stats_galera_map[0]); i++)
{
stats_galera_map[i] = magic_map; /* initialize map array */
}
struct wsrep_stats_var* const stats = wsrep->stats_get(wsrep);
/* to compensate for STATS_TOTAL_* and STATS_STORE_FAILS having no
* counterparts */
int mapped = 3;
i = 0;
while (stats[i].name) /* stats array is terminated by Null name */
{
int j;
for (j = 0; j < STATS_MAX; j++)
{
if (magic_map == stats_galera_map[j] /* j-th member still unset */
&&
!strcmp(stats[i].name, galera_ids[j]))
{
stats_galera_map[j] = (int)i;
mapped++;
if (STATS_MAX == mapped) /* all mapped */ goto out;
}
}
i++;
}
out:
wsrep->stats_free(wsrep, stats);
}
static void
stats_get(node_store_t* const store, wsrep_t* const wsrep, long long stats[])
{
stats[STATS_STORE_FAILS] = node_store_read_view_failures(store);
struct wsrep_stats_var* const ret = wsrep->stats_get(wsrep);
if (!ret)
{
NODE_FATAL("wsrep::stats_get() call failed.");
abort();
}
int i;
for (i = 0; i < STATS_MAX; i++)
{
int j = stats_galera_map[i];
if (j >= 0)
{
assert(WSREP_VAR_INT64 == ret[j].type);
stats[i] = ret[j].value._int64;
}
}
wsrep->stats_free(wsrep, ret);
// totals are just sums
stats[STATS_TOTAL_BYTE] = stats[STATS_REPL_BYTE] + stats[STATS_RECV_BYTE];
stats[STATS_TOTAL_WS ] = stats[STATS_REPL_WS ] + stats[STATS_RECV_WS ];
}
static void
stats_print(long long bef[], long long aft[], double period)
{
double rate[STATS_MAX];
int i;
for (i = 0; i < STATS_MAX; i++)
{
rate[i] = (double)(aft[i] - bef[i])/period;
}
rate[STATS_FC_PAUSED] /= 1.0e+07; // nanoseconds to % of seconds
char str[256];
int written = 0;
/* first line write legend */
for (i = 0; i < STATS_MAX; i++)
{
size_t const space_left = sizeof(str) - (size_t)written;
written += snprintf(&str[written], space_left, "%s", stats_legend[i]);
}
str[written] = '\n';
written++;
/* second line write values */
for (i = 0; i < STATS_MAX; i++)
{
size_t const space_left = sizeof(str) - (size_t)written;
long long const value = (long long)rate[i];
written += snprintf(&str[written], space_left, " %9lld", value);
}
str[written] = '\0';
/* use logging macro for timestamp */
NODE_INFO("\n%s", str);
}
void
node_stats_loop(const struct node_ctx* const node, int const period)
{
double const period_sec = period;
useconds_t const period_usec = (useconds_t)period * 1000000;
wsrep_t* const wsrep = node_wsrep_provider(node->wsrep);
stats_establish_mapping(wsrep);
long long stats1[STATS_MAX];
long long stats2[STATS_MAX];
stats_get(node->store, wsrep, stats1);
while (1)
{
if (usleep(period_usec)) break;
stats_get(node->store, wsrep, stats2);
stats_print(stats1, stats2, period_sec);
if (usleep(period_usec)) break;
stats_get(node->store, wsrep, stats1);
stats_print(stats2, stats1, period_sec);
}
if (EINTR != errno)
{
NODE_ERROR("Unexpected usleep(%lld) error: %d (%s)",
(long long)period_usec, errno, strerror(errno));
}
else
{
/* interrupted by signal */
}
}
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