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/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2023 Cloudbase Solutions
*
* 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 "rados_client_cache.h"
#include "common/errno.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "rbd-wnbd: "
std::shared_ptr<librados::Rados> RadosClientCache::init_client(
std::string& entity_name, std::string& cluster_name)
{
auto rados = std::make_shared<librados::Rados>();
int r = rados->init2(entity_name.c_str(), cluster_name.c_str(), 0);
if (r < 0) {
derr << "couldn't initialize rados: " << cpp_strerror(r)
<< dendl;
return std::shared_ptr<librados::Rados>();
}
r = rados->conf_read_file(nullptr);
if (r < 0) {
derr << "couldn't read conf file: " << cpp_strerror(r)
<< dendl;
return std::shared_ptr<librados::Rados>();
}
r = rados->connect();
if (r < 0) {
derr << "couldn't establish rados connection: "
<< cpp_strerror(r) << dendl;
return std::shared_ptr<librados::Rados>();
} else {
dout(1) << "successfully initialized rados connection" << dendl;
}
return rados;
}
std::shared_ptr<librados::Rados> RadosClientCache::get_client(
std::string& entity_name, std::string& cluster_name)
{
std::unique_lock l{cache_lock};
remove_expired();
std::string key = entity_name + "@" + cluster_name;
auto cached_client_weak = cache.find(key);
if (cached_client_weak != cache.end()) {
if (auto cached_client = cached_client_weak->second.lock()) {
dout(1) << "reusing cached rados client: " << key << dendl;
return cached_client;
} else {
dout(5) << "cleaning up expired rados ref: "
<< cached_client_weak->first << dendl;
cache.erase(cached_client_weak);
}
}
dout(1) << "creating new rados client: " << key << dendl;
auto client = init_client(entity_name, cluster_name);
cache.insert(std::pair{key, client});
return client;
}
void RadosClientCache::remove_expired()
{
auto i = cache.begin();
while (i != cache.end()) {
if (i->second.expired()) {
dout(5) << "removing expired rados ref: "
<< i->first << dendl;
i = cache.erase(i);
continue;
}
i++;
}
}
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