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/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
#ifndef APPLICATION_H
#define APPLICATION_H
#include "base/i2-base.hpp"
#include "base/atomic.hpp"
#include "base/application-ti.hpp"
#include "base/logger.hpp"
#include "base/configuration.hpp"
#include "base/shared-memory.hpp"
#include <cstdint>
#include <iosfwd>
#include <type_traits>
namespace icinga
{
class ThreadPool;
/**
* Abstract base class for applications.
*
* @ingroup base
*/
class Application : public ObjectImpl<Application> {
public:
DECLARE_OBJECT(Application);
static boost::signals2::signal<void ()> OnReopenLogs;
~Application() override;
static void InitializeBase();
static void UninitializeBase();
static Application::Ptr GetInstance();
static void Exit(int rc);
int Run();
/**
* Starts the application.
*
* @returns The exit code of the application.
*/
virtual int Main() = 0;
static void SetResourceLimits();
static int GetArgC();
static void SetArgC(int argc);
static char **GetArgV();
static void SetArgV(char **argv);
static void InstallExceptionHandlers();
static void RequestShutdown();
static void RequestRestart();
static void RequestReopenLogs();
#ifndef _WIN32
static void SetUmbrellaProcess(pid_t pid);
#endif /* _WIN32 */
static bool IsShuttingDown();
static bool IsRestarting();
static void SetDebuggingSeverity(LogSeverity severity);
static LogSeverity GetDebuggingSeverity();
void UpdatePidFile(const String& filename);
void UpdatePidFile(const String& filename, pid_t pid);
void ClosePidFile(bool unlink);
static pid_t ReadPidFile(const String& filename);
static String GetExePath(const String& argv0);
#ifdef _WIN32
static bool IsProcessElevated();
#endif /* _WIN32 */
static int GetDefaultRLimitFiles();
static int GetDefaultRLimitProcesses();
static int GetDefaultRLimitStack();
static double GetReloadTimeout();
static ThreadPool& GetTP();
static String GetAppVersion();
static String GetAppSpecVersion();
static String GetAppEnvironment();
static void SetAppEnvironment(const String& name);
static double GetStartTime();
static void SetStartTime(double ts);
static double GetUptime();
static bool GetScriptDebuggerEnabled();
static void SetScriptDebuggerEnabled(bool enabled);
static double GetLastReloadFailed();
static void SetLastReloadFailed(double ts);
static void DisplayInfoMessage(std::ostream& os, bool skipVersion = false);
protected:
void OnConfigLoaded() override;
void Stop(bool runtimeRemoved) override;
void RunEventLoop();
pid_t StartReloadProcess();
virtual void OnShutdown();
void ValidateName(const Lazy<String>& lvalue, const ValidationUtils& utils) final;
private:
static Application::Ptr m_Instance; /**< The application instance. */
static bool m_ShuttingDown; /**< Whether the application is in the process of shutting down. */
static bool m_RequestRestart; /**< A restart was requested through SIGHUP */
static pid_t m_ReloadProcess; /**< The PID of a subprocess doing a reload, only valid when l_Restarting==true */
static bool m_RequestReopenLogs; /**< Whether we should re-open log files. */
#ifndef _WIN32
static pid_t m_UmbrellaProcess; /**< The PID of the Icinga umbrella process */
#endif /* _WIN32 */
static int m_ArgC; /**< The number of command-line arguments. */
static char **m_ArgV; /**< Command-line arguments. */
FILE *m_PidFile = nullptr; /**< The PID file */
static bool m_Debugging; /**< Whether debugging is enabled. */
static LogSeverity m_DebuggingSeverity; /**< Whether debugging severity is set. */
static double m_StartTime;
static double m_MainTime;
static bool m_ScriptDebuggerEnabled;
#ifdef _WIN32
static double m_LastReloadFailed;
#else /* _WIN32 */
typedef Atomic<std::conditional_t<Atomic<double>::is_always_lock_free, double, uint32_t>> AtomicTs;
static_assert(AtomicTs::is_always_lock_free);
static SharedMemory<AtomicTs> m_LastReloadFailed;
#endif /* _WIN32 */
#ifdef _WIN32
static BOOL WINAPI CtrlHandler(DWORD type);
static LONG WINAPI SEHUnhandledExceptionFilter(PEXCEPTION_POINTERS exi);
#endif /* _WIN32 */
static void DisplayBugMessage(std::ostream& os);
static void SigAbrtHandler(int signum);
static void SigUsr1Handler(int signum);
static void ExceptionHandler();
static String GetCrashReportFilename();
static void AttachDebugger(const String& filename, bool interactive);
};
}
#endif /* APPLICATION_H */
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