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/*
Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#include <regex.h>
//#include <stdlib.h>
#include <string.h>
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include "call-stub.h"
#include "defaults.h"
#include "xlator.h"
#include "api/src/glfs.h"
#include "api/src/glfs-internal.h"
#ifndef NSR_SIM_ETCD
#include "etcd-api.h"
#endif
#include "nsr-internal.h"
#include "../../nsr-recon/src/recon_driver.h"
#include "../../nsr-recon/src/recon_xlator.h"
#define NSR_TTL 5
static void
nsr_set_leader (xlator_t *this, etcd_session etcd)
{
long term = 0;
etcd_result res;
nsr_private_t *priv = this->private;
char n_t[sizeof(long)+1];
char *text = NULL;
gf_log (this->name, GF_LOG_INFO, "Just became leader");
text = etcd_get(etcd, priv->term_key);
if(text == NULL) {
term = 0;
} else {
term = strtol(text, NULL, 10);
}
sprintf(n_t,"%ld",term+1);
res = etcd_set(etcd, priv->term_key,n_t,text,0);
if(res != ETCD_OK) {
gf_log (this->name, GF_LOG_ERROR, "failed to set term");
return;
}
priv->leader = _gf_true;
priv->current_term = term + 1;
if (priv->nsr_recon_start == _gf_false) {
atomic_fetch_and(&(priv->fence_io), 0);
return;
}
// Move this inside recon notify???
atomic_fetch_or(&(priv->fence_io), 1);
nsr_recon_notify_event_set_leader(priv);
return;
}
void *
nsr_leader_thread (void *arg)
{
xlator_t *this = (xlator_t *) arg;
nsr_private_t *priv = this->private;
etcd_result res;
char *index_in = NULL;
char *index_out = NULL;
gf_log (this->name, GF_LOG_INFO,
"calling etcd_open_str on servers %s", priv->etcd_servers);
priv->etcd = etcd_open_str(priv->etcd_servers);
if (!(priv->etcd)) {
gf_log (this->name, GF_LOG_ERROR,
"failed to open etcd session\n");
return NULL;
}
priv->leader_inited = 1;
for (;;) {
/* Not leader yet. Try to become leader. */
for (;;) {
res = etcd_lock (priv->etcd, priv->leader_key, NSR_TTL,
index_in, &index_out);
if (res == ETCD_OK) {
break;
}
gf_log (this->name, GF_LOG_WARNING,
"etcd_lock failed (%d)", res);
sleep(1);
}
/* We're there. Notify other parts of the code. */
nsr_set_leader(this,priv->etcd);
/* Try to retain leadership. */
index_in = index_out;
index_out = NULL;
for (;;) {
res = etcd_lock (priv->etcd, priv->leader_key, NSR_TTL,
index_in, &index_out);
if (index_out && (index_in != index_out)) {
if (index_in) {
free(index_in);
}
index_in = index_out;
index_out = NULL;
}
if (res != ETCD_OK) {
gf_log (this->name, GF_LOG_WARNING,
"lost leadership (%d)", res);
if (index_out) {
free(index_out);
}
break;
}
sleep(1);
}
}
etcd_close_str(priv->etcd);
return NULL;
}
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