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Diffstat (limited to 'src/crimson/common/config_proxy.h')
| -rw-r--r-- | src/crimson/common/config_proxy.h | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/src/crimson/common/config_proxy.h b/src/crimson/common/config_proxy.h new file mode 100644 index 000000000..f50a63431 --- /dev/null +++ b/src/crimson/common/config_proxy.h @@ -0,0 +1,200 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab + +#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 { +class Formatter; +} + +namespace crimson::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](ConfigObserver *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(); + } + const ConfigValues get_config_values() { + 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,std::less<>>& kv) { + return do_change([kv, this](ConfigValues& values) { + get_config().set_mon_vals(nullptr, values, obs_mgr, kv, nullptr); + }); + } + + seastar::future<> inject_args(const std::string& s) { + return do_change([s, this](ConfigValues& values) { + std::stringstream err; + if (get_config().injectargs(values, obs_mgr, s, &err)) { + throw std::invalid_argument(err.str()); + } + }); + } + void show_config(ceph::Formatter* f) const; + + seastar::future<> parse_argv(std::vector<const char*>& argv) { + // we could pass whatever is unparsed to seastar, but seastar::app_template + // is used for driving the seastar application, and + // crimson::common::ConfigProxy is not available until seastar engine is up + // and running, so we have to feed the command line args to app_template + // first, then pass them to ConfigProxy. + return do_change([&argv, this](ConfigValues& values) { + get_config().parse_argv(values, + obs_mgr, + argv, + CONF_CMDLINE); + }); + } + + seastar::future<> parse_config_files(const std::string& conf_files); + + 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; +} + +} |