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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
#pragma once
#include <seastar/core/reactor.hh>
#include <seastar/core/sharded.hh>
#include "common/config.h"
#include "common/config_obs.h"
#include "common/config_obs_mgr.h"
#include "common/errno.h"
namespace ceph::common {
// a facade for managing config. each shard has its own copy of ConfigProxy.
//
// In seastar-osd, there could be multiple instances of @c ConfigValues in a
// single process, as we are using a variant of read-copy-update mechinary to
// update the settings at runtime.
class ConfigProxy : public seastar::peering_sharded_service<ConfigProxy>
{
using LocalConfigValues = seastar::lw_shared_ptr<ConfigValues>;
seastar::foreign_ptr<LocalConfigValues> values;
md_config_t* remote_config = nullptr;
std::unique_ptr<md_config_t> local_config;
using ConfigObserver = ceph::md_config_obs_impl<ConfigProxy>;
ObserverMgr<ConfigObserver> obs_mgr;
const md_config_t& get_config() const {
return remote_config ? *remote_config : * local_config;
}
md_config_t& get_config() {
return remote_config ? *remote_config : * local_config;
}
// apply changes to all shards
// @param func a functor which accepts @c "ConfigValues&"
template<typename Func>
seastar::future<> do_change(Func&& func) {
return container().invoke_on(values.get_owner_shard(),
[func = std::move(func)](ConfigProxy& owner) {
// apply the changes to a copy of the values
auto new_values = seastar::make_lw_shared(*owner.values);
new_values->changed.clear();
func(*new_values);
// always apply the new settings synchronously on the owner shard, to
// avoid racings with other do_change() calls in parallel.
ObserverMgr<ConfigObserver>::rev_obs_map rev_obs;
owner.values.reset(new_values);
owner.obs_mgr.for_each_change(owner.values->changed, owner,
[&rev_obs](ConfigObserver *obs,
const std::string &key) {
rev_obs[obs].insert(key);
}, nullptr);
for (auto& [obs, keys] : rev_obs) {
obs->handle_conf_change(owner, keys);
}
return seastar::parallel_for_each(boost::irange(1u, seastar::smp::count),
[&owner, new_values] (auto cpu) {
return owner.container().invoke_on(cpu,
[foreign_values = seastar::make_foreign(new_values)](ConfigProxy& proxy) mutable {
proxy.values.reset();
proxy.values = std::move(foreign_values);
ObserverMgr<ConfigObserver>::rev_obs_map rev_obs;
proxy.obs_mgr.for_each_change(proxy.values->changed, proxy,
[&rev_obs](md_config_obs_t *obs,
const std::string &key) {
rev_obs[obs].insert(key);
}, nullptr);
for (auto& obs_keys : rev_obs) {
obs_keys.first->handle_conf_change(proxy, obs_keys.second);
}
});
}).finally([new_values] {
new_values->changed.clear();
});
});
}
public:
ConfigProxy(const EntityName& name, std::string_view cluster);
const ConfigValues* operator->() const noexcept {
return values.get();
}
ConfigValues* operator->() noexcept {
return values.get();
}
// required by sharded<>
seastar::future<> start();
seastar::future<> stop() {
return seastar::make_ready_future<>();
}
void add_observer(ConfigObserver* obs) {
obs_mgr.add_observer(obs);
}
void remove_observer(ConfigObserver* obs) {
obs_mgr.remove_observer(obs);
}
seastar::future<> rm_val(const std::string& key) {
return do_change([key, this](ConfigValues& values) {
auto ret = get_config().rm_val(values, key);
if (ret < 0) {
throw std::invalid_argument(cpp_strerror(ret));
}
});
}
seastar::future<> set_val(const std::string& key,
const std::string& val) {
return do_change([key, val, this](ConfigValues& values) {
std::stringstream err;
auto ret = get_config().set_val(values, obs_mgr, key, val, &err);
if (ret < 0) {
throw std::invalid_argument(err.str());
}
});
}
int get_val(const std::string &key, std::string *val) const {
return get_config().get_val(*values, key, val);
}
template<typename T>
const T get_val(const std::string& key) const {
return get_config().template get_val<T>(*values, key);
}
int get_all_sections(std::vector<std::string>& sections) const {
return get_config().get_all_sections(sections);
}
int get_val_from_conf_file(const std::vector<std::string>& sections,
const std::string& key, std::string& out,
bool expand_meta) const {
return get_config().get_val_from_conf_file(*values, sections, key,
out, expand_meta);
}
unsigned get_osd_pool_default_min_size(uint8_t size) const {
return get_config().get_osd_pool_default_min_size(*values, size);
}
seastar::future<> set_mon_vals(const std::map<std::string,std::string>& kv) {
return do_change([kv, this](ConfigValues& values) {
get_config().set_mon_vals(nullptr, values, obs_mgr, kv, nullptr);
});
}
seastar::future<> parse_config_files(const std::string& conf_files) {
return do_change([this, conf_files](ConfigValues& values) {
const char* conf_file_paths =
conf_files.empty() ? nullptr : conf_files.c_str();
get_config().parse_config_files(values,
obs_mgr,
conf_file_paths,
&std::cerr,
CODE_ENVIRONMENT_DAEMON);
});
}
using ShardedConfig = seastar::sharded<ConfigProxy>;
private:
static ShardedConfig sharded_conf;
friend ConfigProxy& local_conf();
friend ShardedConfig& sharded_conf();
};
inline ConfigProxy& local_conf() {
return ConfigProxy::sharded_conf.local();
}
inline ConfigProxy::ShardedConfig& sharded_conf() {
return ConfigProxy::sharded_conf;
}
}
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