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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "librbd/ConfigWatcher.h"
#include "common/config_obs.h"
#include "common/dout.h"
#include "common/errno.h"
#include "librbd/ImageCtx.h"
#include "librbd/ImageState.h"
#include "librbd/api/Config.h"
#include <deque>
#include <string>
#include <vector>
#include <boost/algorithm/string/predicate.hpp>
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::ConfigWatcher: " \
<< __func__ << ": "
namespace librbd {
template <typename I>
struct ConfigWatcher<I>::Observer : public md_config_obs_t {
ConfigWatcher<I>* m_config_watcher;
std::deque<std::string> m_config_key_strs;
mutable std::vector<const char*> m_config_keys;
Observer(CephContext* cct, ConfigWatcher<I>* config_watcher)
: m_config_watcher(config_watcher) {
const std::string rbd_key_prefix("rbd_");
auto& schema = cct->_conf.get_schema();
for (auto& pair : schema) {
// watch all "rbd_" keys for simplicity
if (!boost::starts_with(pair.first, rbd_key_prefix)) {
continue;
}
m_config_key_strs.emplace_back(pair.first);
}
m_config_keys.reserve(m_config_key_strs.size());
for (auto& key : m_config_key_strs) {
m_config_keys.emplace_back(key.c_str());
}
m_config_keys.emplace_back(nullptr);
}
const char** get_tracked_conf_keys() const override {
ceph_assert(!m_config_keys.empty());
return &m_config_keys[0];
}
void handle_conf_change(const ConfigProxy& conf,
const std::set <std::string> &changed) override {
m_config_watcher->handle_global_config_change(changed);
}
};
template <typename I>
ConfigWatcher<I>::ConfigWatcher(I& image_ctx)
: m_image_ctx(image_ctx) {
}
template <typename I>
ConfigWatcher<I>::~ConfigWatcher() {
ceph_assert(m_observer == nullptr);
}
template <typename I>
void ConfigWatcher<I>::init() {
auto cct = m_image_ctx.cct;
ldout(cct, 10) << dendl;
m_observer = new Observer(cct, this);
cct->_conf.add_observer(m_observer);
}
template <typename I>
void ConfigWatcher<I>::shut_down() {
auto cct = m_image_ctx.cct;
ldout(cct, 10) << dendl;
ceph_assert(m_observer != nullptr);
cct->_conf.remove_observer(m_observer);
delete m_observer;
m_observer = nullptr;
}
template <typename I>
void ConfigWatcher<I>::handle_global_config_change(
std::set<std::string> changed_keys) {
{
// ignore any global changes that are being overridden
std::shared_lock image_locker{m_image_ctx.image_lock};
for (auto& key : m_image_ctx.config_overrides) {
changed_keys.erase(key);
}
}
if (changed_keys.empty()) {
return;
}
auto cct = m_image_ctx.cct;
ldout(cct, 10) << "changed_keys=" << changed_keys << dendl;
// refresh the image to pick up any global config overrides
m_image_ctx.state->handle_update_notification();
}
} // namespace librbd
template class librbd::ConfigWatcher<librbd::ImageCtx>;
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