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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "ClusterWatcher.h"
#include "include/stringify.h"
#include "common/ceph_json.h"
#include "common/debug.h"
#include "common/errno.h"
#include "cls/rbd/cls_rbd_client.h"
#include "librbd/internal.h"
#include "librbd/api/Mirror.h"
#include "tools/rbd_mirror/ServiceDaemon.h"
#include "json_spirit/json_spirit.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_rbd_mirror
#undef dout_prefix
#define dout_prefix *_dout << "rbd::mirror::ClusterWatcher:" << this << " " \
<< __func__ << ": "
using std::list;
using std::map;
using std::pair;
using std::set;
using std::string;
using std::unique_ptr;
using std::vector;
using librados::Rados;
using librados::IoCtx;
namespace rbd {
namespace mirror {
ClusterWatcher::ClusterWatcher(RadosRef cluster, ceph::mutex &lock,
ServiceDaemon<librbd::ImageCtx>* service_daemon)
: m_cluster(cluster), m_lock(lock), m_service_daemon(service_daemon)
{
}
const ClusterWatcher::PoolPeers& ClusterWatcher::get_pool_peers() const
{
ceph_assert(ceph_mutex_is_locked(m_lock));
return m_pool_peers;
}
std::string ClusterWatcher::get_site_name() const {
ceph_assert(ceph_mutex_is_locked(m_lock));
return m_site_name;
}
void ClusterWatcher::refresh_pools()
{
dout(20) << "enter" << dendl;
PoolPeers pool_peers;
read_pool_peers(&pool_peers);
std::string site_name;
int r = read_site_name(&site_name);
std::lock_guard l{m_lock};
m_pool_peers = pool_peers;
if (r >= 0) {
m_site_name = site_name;
}
// TODO: perhaps use a workqueue instead, once we get notifications
// about config changes for existing pools
}
void ClusterWatcher::read_pool_peers(PoolPeers *pool_peers)
{
int r = m_cluster->wait_for_latest_osdmap();
if (r < 0) {
derr << "error waiting for OSD map: " << cpp_strerror(r) << dendl;
return;
}
list<pair<int64_t, string> > pools;
r = m_cluster->pool_list2(pools);
if (r < 0) {
derr << "error listing pools: " << cpp_strerror(r) << dendl;
return;
}
std::set<int64_t> service_pool_ids;
for (auto& kv : pools) {
int64_t pool_id = kv.first;
auto& pool_name = kv.second;
int64_t base_tier;
r = m_cluster->pool_get_base_tier(pool_id, &base_tier);
if (r == -ENOENT) {
dout(10) << "pool " << pool_name << " no longer exists" << dendl;
continue;
} else if (r < 0) {
derr << "Error retrieving base tier for pool " << pool_name << dendl;
continue;
}
if (pool_id != base_tier) {
// pool is a cache; skip it
continue;
}
IoCtx ioctx;
r = m_cluster->ioctx_create2(pool_id, ioctx);
if (r == -ENOENT) {
dout(10) << "pool " << pool_id << " no longer exists" << dendl;
continue;
} else if (r < 0) {
derr << "Error accessing pool " << pool_name << cpp_strerror(r) << dendl;
continue;
}
cls::rbd::MirrorMode mirror_mode_internal;
r = librbd::cls_client::mirror_mode_get(&ioctx, &mirror_mode_internal);
if (r == 0 && mirror_mode_internal == cls::rbd::MIRROR_MODE_DISABLED) {
dout(10) << "mirroring is disabled for pool " << pool_name << dendl;
continue;
}
service_pool_ids.insert(pool_id);
if (m_service_pools.find(pool_id) == m_service_pools.end()) {
m_service_pools[pool_id] = {};
m_service_daemon->add_pool(pool_id, pool_name);
}
if (r == -EPERM) {
dout(10) << "access denied querying pool " << pool_name << dendl;
m_service_pools[pool_id] = m_service_daemon->add_or_update_callout(
pool_id, m_service_pools[pool_id],
service_daemon::CALLOUT_LEVEL_WARNING, "access denied");
continue;
} else if (r < 0) {
derr << "could not tell whether mirroring was enabled for " << pool_name
<< " : " << cpp_strerror(r) << dendl;
m_service_pools[pool_id] = m_service_daemon->add_or_update_callout(
pool_id, m_service_pools[pool_id],
service_daemon::CALLOUT_LEVEL_WARNING, "mirroring mode query failed");
continue;
}
vector<librbd::mirror_peer_site_t> configs;
r = librbd::api::Mirror<>::peer_site_list(ioctx, &configs);
if (r < 0) {
derr << "error reading mirroring config for pool " << pool_name
<< cpp_strerror(r) << dendl;
m_service_pools[pool_id] = m_service_daemon->add_or_update_callout(
pool_id, m_service_pools[pool_id],
service_daemon::CALLOUT_LEVEL_ERROR, "mirroring peer list failed");
continue;
}
std::vector<PeerSpec> peers;
peers.reserve(configs.size());
for (auto& peer : configs) {
if (peer.direction != RBD_MIRROR_PEER_DIRECTION_TX) {
peers.push_back(peer);
}
}
for (auto& peer : peers) {
r = resolve_peer_site_config_keys(pool_id, pool_name, &peer);
if (r < 0) {
break;
}
}
if (m_service_pools[pool_id] != service_daemon::CALLOUT_ID_NONE) {
m_service_daemon->remove_callout(pool_id, m_service_pools[pool_id]);
m_service_pools[pool_id] = service_daemon::CALLOUT_ID_NONE;
}
pool_peers->emplace(pool_id, Peers{peers.begin(), peers.end()});
}
for (auto it = m_service_pools.begin(); it != m_service_pools.end(); ) {
auto current_it(it++);
if (service_pool_ids.find(current_it->first) == service_pool_ids.end()) {
m_service_daemon->remove_pool(current_it->first);
m_service_pools.erase(current_it->first);
}
}
}
int ClusterWatcher::read_site_name(std::string* site_name) {
dout(10) << dendl;
librbd::RBD rbd;
return rbd.mirror_site_name_get(*m_cluster, site_name);
}
int ClusterWatcher::resolve_peer_site_config_keys(int64_t pool_id,
const std::string& pool_name,
PeerSpec* peer) {
dout(10) << "retrieving config-key: pool_id=" << pool_id << ", "
<< "pool_name=" << pool_name << ", "
<< "peer_uuid=" << peer->uuid << dendl;
std::string cmd =
"{"
"\"prefix\": \"config-key get\", "
"\"key\": \"" RBD_MIRROR_PEER_CONFIG_KEY_PREFIX + stringify(pool_id) +
"/" + peer->uuid + "\""
"}";
bufferlist in_bl;
bufferlist out_bl;
int r = m_cluster->mon_command(cmd, in_bl, &out_bl, nullptr);
if (r == -ENOENT || out_bl.length() == 0) {
return 0;
} else if (r < 0) {
derr << "error reading mirroring peer config for pool " << pool_name << ": "
<< cpp_strerror(r) << dendl;
m_service_pools[pool_id] = m_service_daemon->add_or_update_callout(
pool_id, m_service_pools[pool_id],
service_daemon::CALLOUT_LEVEL_WARNING,
"mirroring peer config-key query failed");
return r;
}
bool json_valid = false;
json_spirit::mValue json_root;
if(json_spirit::read(out_bl.to_str(), json_root)) {
try {
auto& json_obj = json_root.get_obj();
if (json_obj.count("mon_host")) {
peer->mon_host = json_obj["mon_host"].get_str();
}
if (json_obj.count("key")) {
peer->key = json_obj["key"].get_str();
}
json_valid = true;
} catch (std::runtime_error&) {
}
}
if (!json_valid) {
derr << "error parsing mirroring peer config for pool " << pool_name << ", "
<< "peer " << peer->uuid << dendl;
m_service_pools[pool_id] = m_service_daemon->add_or_update_callout(
pool_id, m_service_pools[pool_id],
service_daemon::CALLOUT_LEVEL_WARNING,
"mirroring peer config-key decode failed");
}
return 0;
}
} // namespace mirror
} // namespace rbd
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