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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2011 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include "HeartbeatMap.h"
#include "ceph_context.h"
#include "common/errno.h"
#include "debug.h"
#define dout_subsys ceph_subsys_heartbeatmap
#undef dout_prefix
#define dout_prefix *_dout << "heartbeat_map "
namespace ceph {
HeartbeatMap::HeartbeatMap(CephContext *cct)
: m_cct(cct),
m_rwlock("HeartbeatMap::m_rwlock")
{
}
HeartbeatMap::~HeartbeatMap()
{
assert(m_workers.empty());
}
heartbeat_handle_d *HeartbeatMap::add_worker(string name)
{
m_rwlock.get_write();
ldout(m_cct, 10) << "add_worker '" << name << "'" << dendl;
heartbeat_handle_d *h = new heartbeat_handle_d(name);
m_workers.push_front(h);
h->list_item = m_workers.begin();
m_rwlock.put_write();
return h;
}
void HeartbeatMap::remove_worker(heartbeat_handle_d *h)
{
m_rwlock.get_write();
ldout(m_cct, 10) << "remove_worker '" << h->name << "'" << dendl;
m_workers.erase(h->list_item);
m_rwlock.put_write();
delete h;
}
bool HeartbeatMap::_check(heartbeat_handle_d *h, const char *who, time_t now)
{
bool healthy = true;
time_t was;
was = h->timeout.read();
if (was && was < now) {
ldout(m_cct, 1) << who << " '" << h->name << "'"
<< " had timed out after " << h->grace << dendl;
healthy = false;
}
was = h->suicide_timeout.read();
if (was && was < now) {
ldout(m_cct, 1) << who << " '" << h->name << "'"
<< " had suicide timed out after " << h->suicide_grace << dendl;
assert(0 == "hit suicide timeout");
}
return healthy;
}
void HeartbeatMap::reset_timeout(heartbeat_handle_d *h, time_t grace, time_t suicide_grace)
{
ldout(m_cct, 20) << "reset_timeout '" << h->name << "' grace " << grace
<< " suicide " << suicide_grace << dendl;
time_t now = time(NULL);
_check(h, "reset_timeout", now);
h->timeout.set(now + grace);
h->grace = grace;
if (suicide_grace)
h->suicide_timeout.set(now + suicide_grace);
else
h->suicide_timeout.set(0);
h->suicide_grace = suicide_grace;
}
void HeartbeatMap::clear_timeout(heartbeat_handle_d *h)
{
ldout(m_cct, 20) << "clear_timeout '" << h->name << "'" << dendl;
time_t now = time(NULL);
_check(h, "clear_timeout", now);
h->timeout.set(0);
h->suicide_timeout.set(0);
}
bool HeartbeatMap::is_healthy()
{
m_rwlock.get_read();
time_t now = time(NULL);
bool healthy = true;
for (list<heartbeat_handle_d*>::iterator p = m_workers.begin();
p != m_workers.end();
++p) {
heartbeat_handle_d *h = *p;
if (!_check(h, "is_healthy", now)) {
healthy = false;
}
}
m_rwlock.put_read();
ldout(m_cct, 20) << "is_healthy = " << (healthy ? "healthy" : "NOT HEALTH") << dendl;
return healthy;
}
void HeartbeatMap::check_touch_file()
{
if (is_healthy()) {
string path = m_cct->_conf->heartbeat_file;
if (path.length()) {
int fd = ::open(path.c_str(), O_WRONLY|O_CREAT, 0644);
if (fd >= 0) {
::utimes(path.c_str(), NULL);
::close(fd);
} else {
ldout(m_cct, 0) << "unable to touch " << path << ": "
<< cpp_strerror(errno) << dendl;
}
}
}
}
}
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