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201 lines
6.7 KiB
C++
201 lines
6.7 KiB
C++
#pragma once
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#include <sys/types.h>
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#include <unistd.h>
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#include <iostream>
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#include <memory>
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#include <functional>
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#include <optional>
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#include <mutex>
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#include <condition_variable>
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#include <atomic>
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#include <chrono>
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#include <Poco/Process.h>
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#include <Poco/ThreadPool.h>
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#include <Poco/Util/Application.h>
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#include <Poco/Util/ServerApplication.h>
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#include <Poco/Net/SocketAddress.h>
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#include <Poco/Version.h>
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#include <common/types.h>
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#include <common/logger_useful.h>
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#include <common/getThreadId.h>
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#include <daemon/GraphiteWriter.h>
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#include <Common/Config/ConfigProcessor.h>
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#include <Common/StatusFile.h>
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#include <loggers/Loggers.h>
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/// \brief Base class for applications that can run as daemons.
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///
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/// \code
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/// # Some possible command line options:
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/// # --config-file, -C or --config - path to configuration file. By default - config.xml in the current directory.
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/// # --log-file
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/// # --errorlog-file
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/// # --daemon - run as daemon; without this option, the program will be attached to the terminal and also output logs to stderr.
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/// <daemon_name> --daemon --config-file=localfile.xml --log-file=log.log --errorlog-file=error.log
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/// \endcode
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///
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/// You can configure different log options for different loggers used inside program
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/// by providing subsections to "logger" in configuration file.
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class BaseDaemon : public Poco::Util::ServerApplication, public Loggers
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{
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friend class SignalListener;
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public:
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static inline constexpr char DEFAULT_GRAPHITE_CONFIG_NAME[] = "graphite";
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BaseDaemon();
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~BaseDaemon() override;
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/// Load configuration, prepare loggers, etc.
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void initialize(Poco::Util::Application &) override;
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void reloadConfiguration();
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/// Process command line parameters
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void defineOptions(Poco::Util::OptionSet & new_options) override;
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/// Graceful shutdown
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static void terminate();
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/// Forceful shutdown
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[[noreturn]] void kill();
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/// Cancellation request has been received.
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bool isCancelled() const
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{
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return is_cancelled;
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}
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static BaseDaemon & instance()
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{
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return dynamic_cast<BaseDaemon &>(Poco::Util::Application::instance());
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}
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/// return none if daemon doesn't exist, reference to the daemon otherwise
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static std::optional<std::reference_wrapper<BaseDaemon>> tryGetInstance() { return tryGetInstance<BaseDaemon>(); }
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/// В Graphite компоненты пути(папки) разделяются точкой.
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/// У нас принят путь формата root_path.hostname_yandex_ru.key
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/// root_path по умолчанию one_min
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/// key - лучше группировать по смыслу. Например "meminfo.cached" или "meminfo.free", "meminfo.total"
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template <class T>
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void writeToGraphite(const std::string & key, const T & value, const std::string & config_name = DEFAULT_GRAPHITE_CONFIG_NAME, time_t timestamp = 0, const std::string & custom_root_path = "")
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{
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auto writer = getGraphiteWriter(config_name);
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if (writer)
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writer->write(key, value, timestamp, custom_root_path);
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}
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template <class T>
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void writeToGraphite(const GraphiteWriter::KeyValueVector<T> & key_vals, const std::string & config_name = DEFAULT_GRAPHITE_CONFIG_NAME, time_t timestamp = 0, const std::string & custom_root_path = "")
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{
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auto writer = getGraphiteWriter(config_name);
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if (writer)
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writer->write(key_vals, timestamp, custom_root_path);
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}
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template <class T>
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void writeToGraphite(const GraphiteWriter::KeyValueVector<T> & key_vals, const std::chrono::system_clock::time_point & current_time, const std::string & custom_root_path)
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{
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auto writer = getGraphiteWriter();
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if (writer)
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writer->write(key_vals, std::chrono::system_clock::to_time_t(current_time), custom_root_path);
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}
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GraphiteWriter * getGraphiteWriter(const std::string & config_name = DEFAULT_GRAPHITE_CONFIG_NAME)
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{
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if (graphite_writers.count(config_name))
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return graphite_writers[config_name].get();
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return nullptr;
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}
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/// close all process FDs except
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/// 0-2 -- stdin, stdout, stderr
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/// also doesn't close global internal pipes for signal handling
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static void closeFDs();
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/// If this method is called after initialization and before run,
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/// will fork child process and setup watchdog that will print diagnostic info, if the child terminates.
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/// argv0 is needed to change process name (consequently, it is needed for scripts involving "pgrep", "pidof" to work correctly).
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void shouldSetupWatchdog(char * argv0_);
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/// Hash of the binary for integrity checks.
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String getStoredBinaryHash() const;
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protected:
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virtual void logRevision() const;
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/// thread safe
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virtual void handleSignal(int signal_id);
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/// initialize termination process and signal handlers
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virtual void initializeTerminationAndSignalProcessing();
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/// fork the main process and watch if it was killed
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void setupWatchdog();
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void waitForTerminationRequest()
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#if defined(POCO_CLICKHOUSE_PATCH) || POCO_VERSION >= 0x02000000 // in old upstream poco not vitrual
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override
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#endif
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;
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/// thread safe
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virtual void onInterruptSignals(int signal_id);
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template <class Daemon>
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static std::optional<std::reference_wrapper<Daemon>> tryGetInstance();
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virtual std::string getDefaultCorePath() const;
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std::optional<DB::StatusFile> pid_file;
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std::atomic_bool is_cancelled{false};
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bool log_to_console = false;
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/// A thread that acts on HUP and USR1 signal (close logs).
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Poco::Thread signal_listener_thread;
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std::unique_ptr<Poco::Runnable> signal_listener;
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std::map<std::string, std::unique_ptr<GraphiteWriter>> graphite_writers;
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std::mutex signal_handler_mutex;
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std::condition_variable signal_event;
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std::atomic_size_t terminate_signals_counter{0};
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std::atomic_size_t sigint_signals_counter{0};
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std::string config_path;
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DB::ConfigProcessor::LoadedConfig loaded_config;
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Poco::Util::AbstractConfiguration * last_configuration = nullptr;
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String build_id_info;
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String stored_binary_hash;
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std::vector<int> handled_signals;
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bool should_setup_watchdog = false;
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char * argv0 = nullptr;
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};
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template <class Daemon>
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std::optional<std::reference_wrapper<Daemon>> BaseDaemon::tryGetInstance()
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{
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Daemon * ptr = nullptr;
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try
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{
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ptr = dynamic_cast<Daemon *>(&Poco::Util::Application::instance());
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}
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catch (const Poco::NullPointerException &)
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{
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/// if daemon doesn't exist than instance() throw NullPointerException
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}
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if (ptr)
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return std::optional<std::reference_wrapper<Daemon>>(*ptr);
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else
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return {};
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}
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