Kea: isc::process::DControllerBase Class Reference

| Kea 3.2.0-git

isc::process::DControllerBase Class Referenceabstract

Application Controller. More...

`#include <d_controller.h>`

Inheritance diagram for isc::process::DControllerBase:
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## Public Member Functions
| DControllerBase (const char *app_name, const char *bin_name)
| Constructor.
virtual | ~DControllerBase ()
| Destructor.
isc::data::ConstElementPtr | buildReportHandler (const std::string &command, isc::data::ConstElementPtr args)
| handler for 'build-report' command
virtual isc::data::ConstElementPtr | checkConfig (isc::data::ConstElementPtr new_config)
| Instance method invoked by the configuration event handler and which processes the actual configuration check.
virtual isc::data::ConstElementPtr | configFromFile ()
| Reconfigures the process from a configuration file.
isc::data::ConstElementPtr | configGetHandler (const std::string &command, isc::data::ConstElementPtr args)
| handler for config-get command
isc::data::ConstElementPtr | configHashGetHandler (const std::string &command, isc::data::ConstElementPtr args)
| handler for config-hash-get command
isc::data::ConstElementPtr | configReloadHandler (const std::string &command, isc::data::ConstElementPtr args)
| handler for config-reload command
isc::data::ConstElementPtr | configSetHandler (const std::string &command, isc::data::ConstElementPtr args)
| handler for config-set command
isc::data::ConstElementPtr | configTestHandler (const std::string &command, isc::data::ConstElementPtr args)
| handler for config-test command
isc::data::ConstElementPtr | configWriteHandler (const std::string &command, isc::data::ConstElementPtr args)
| handler for config-write command
std::string | getAppName () const
| Fetches the name of the application under control.
std::string | getBinName () const
| Fetches the name of the application executable.
std::string | getVersion (bool extended)
| returns Kea version on stdout and exit.
virtual int | launch (int argc, char *argv[], const bool test_mode)
| Acts as the primary entry point into the controller execution and provides the outermost application control logic:
isc::data::ConstElementPtr | serverTagGetHandler (const std::string &command, isc::data::ConstElementPtr args)
| handler for server-tag-get command
isc::data::ConstElementPtr | shutdownHandler (const std::string &command, isc::data::ConstElementPtr args)
| handler for 'shutdown' command
isc::data::ConstElementPtr | statusGetHandler (const std::string &command, isc::data::ConstElementPtr args)
| handler for status-get command
virtual isc::data::ConstElementPtr | updateConfig (isc::data::ConstElementPtr new_config)
| Instance method invoked by the configuration event handler and which processes the actual configuration update.
isc::data::ConstElementPtr | versionGetHandler (const std::string &command, isc::data::ConstElementPtr args)
| handler for version-get command
Public Member Functions inherited from isc::process::Daemon
| Daemon ()
| Default constructor.
virtual | ~Daemon ()
| Destructor.
void | checkConfigFile () const
| Checks the configuration file name.
void | checkWriteConfigFile (std::string &file)
| Checks the to-be-written configuration file name.
virtual void | cleanup ()
| Performs final deconfiguration.
void | createPIDFile (int pid=0)
| Creates the PID file.
std::string | getConfigFile () const
| Returns config file name.
int | getExitValue ()
| Fetches the exit value.
std::string | getPIDFileDir () const
| Returns the directory used when forming default PID file name.
std::string | getPIDFileName () const
| Returns the current PID file name.
std::string | getPIDLockName () const
| Returns the current PID lock file name.
virtual std::list< std::list< std::string > > | jsonPathsToRedact () const
| Return a list of all paths that contain passwords or secrets.
isc::data::ConstElementPtr | redactConfig (isc::data::ConstElementPtr const &config)
| Redact a configuration.
void | setConfigFile (const std::string &config_file)
| Sets the configuration file name.
void | setExitValue (int value)
| Sets the exit value.
void | setPIDFileDir (const std::string &pid_file_dir)
| Sets the PID file directory.
void | setPIDFileName (const std::string &pid_file_name)
| Sets PID file name.
virtual void | shutdown ()
| Initiates shutdown procedure for the whole server.
virtual size_t | writeConfigFile (const std::string &config_file, isc::data::ConstElementPtr cfg=isc::data::ConstElementPtr()) const
| Writes current configuration to specified file.

## Protected Member Functions
void | checkConfigOnly ()
| Check the configuration.
virtual DProcessBase * | createProcess ()=0
| Abstract method that is responsible for instantiating the application process object.
virtual bool | customOption (int option, char *optarg)
| Virtual method that provides derivations the opportunity to support additional command line options.
virtual const std::string | getCustomOpts () const
| Virtual method which returns a string containing the option letters for any custom command line options supported by the derivation.
asiolink::IOServicePtr & | getIOService ()
| Getter for fetching the controller's IOService.
DProcessBasePtr | getProcess ()
| Fetches the current process.
virtual const std::string | getUsageText () const
| Virtual method which can be used to contribute derivation specific usage text.
virtual std::string | getVersionAddendum ()
| Fetches text containing additional version specifics.
std::string | handleOtherObjects (isc::data::ConstElementPtr args)
| Deals with other (i.e.
void | initProcess ()
| Instantiates the application process and then initializes it.
void | initSignalHandling ()
| Initializes signal handling.
bool | isCheckOnly () const
| Supplies whether or not check only mode is enabled.
bool | isVerbose () const
| Supplies whether or not verbose logging is enabled.
void | parseArgs (int argc, char *argv[])
| Processes the command line arguments.
virtual isc::data::ConstElementPtr | parseFile (const std::string &file_name)
| Parse a given file into Elements.
virtual isc::data::ConstElementPtr | parseText (const std::string &input)
| Parse text into Elements.
virtual void | processSignal (int signum)
| Application-level signal processing method.
void | runProcess ()
| Invokes the application process's event loop,(DBaseProcess::run).
void | setCheckOnly (bool value)
| Method for enabling or disabling check only mode.
void | setVerbose (bool value)
| Method for enabling or disabling verbose logging.
isc::data::ConstElementPtr | shutdownProcess (isc::data::ConstElementPtr args)
| Initiates shutdown procedure.
void | usage (const std::string &text)
| Prints the program usage text to std error.
Protected Member Functions inherited from isc::process::Daemon
std::string | makePIDFileName () const
| Manufacture the pid file name.

## Static Protected Member Functions
static DControllerBasePtr & | getController ()
| Static getter which returns the singleton instance.
static void | setController (const DControllerBasePtr &controller)
| Static setter which sets the singleton instance.

## Friends
class | DControllerTest

## Additional Inherited Members
Static Public Member Functions inherited from isc::process::Daemon
static void | configureLogger (const isc::data::ConstElementPtr &log_config, const isc::process::ConfigPtr &storage)
| Configures logger.
static std::string | getDefaultLoggerName ()
| Returns default logger name.
static std::string | getProcName ()
| returns the process name This value is used as when forming the default PID file name
static bool | getVerbose ()
| Returns if running in verbose mode.
static std::string | getVersion (bool extended)
| returns Kea version on stdout and exits.
static void | loggerInit (const char *log_name, bool verbose)
| Initializes logger.
static void | setDefaultLoggerName (const std::string &logger)
| Sets the default logger name.
static void | setProcName (const std::string &proc_name)
| Sets the process name.
static void | setVerbose (const bool verbose)
| Sets or clears verbose mode.
Protected Attributes inherited from isc::process::Daemon
isc::asiolink::IOSignalSetPtr | signal_set_
| A pointer to the object installing custom signal handlers.
boost::posix_time::ptime | start_
| Timestamp of the start of the daemon.

## Detailed Description

Application Controller.

DControllerBase is an abstract singleton which provides the framework and services for managing an application process that implements the DProcessBase interface. It runs the process like a stand-alone, command line driven executable, which must be supplied a configuration file at startup. It coordinates command line argument parsing, process instantiation and initialization, and runtime control through external command and configuration event handling. It creates the IOService instance which is used for runtime control events and passes the IOService into the application process at process creation. It provides the callback handlers for command and configuration events which could be triggered by an external source. Such sources are intended to be registered with and monitored by the controller's IOService such that the appropriate handler can be invoked.

DControllerBase provides dynamic configuration file reloading upon receipt of SIGHUP, and graceful shutdown upon receipt of either SIGINT or SIGTERM.

NOTE: Derivations must supply their own static singleton instance method(s) for creating and fetching the instance. The base class declares the instance member in order for it to be available for static callback functions.

Definition at line 103 of file d_controller.h.

## Constructor & Destructor Documentation

## ◆ DControllerBase()

isc::process::DControllerBase::DControllerBase | ( | const char * | app_name,
|  | const char * | bin_name )

Constructor.

Parameters

  app_name | is display name of the application under control. This name appears in log statements.
  bin_name | is the name of the application executable.

Definition at line 47 of file d_controller.cc.

Referenced by initSignalHandling().

## ◆ ~DControllerBase()

isc::process::DControllerBase::~DControllerBase | ( |  | ) |
| virtual

Destructor.

Definition at line 859 of file d_controller.cc.

References isc::asiolink::IOServiceMgr::clearIOServices(), isc::process::dctl_logger, isc::process::DCTL_UNLOAD_LIBRARIES_ERROR, getIOService(), isc::hooks::HooksManager::getLibraryNames(), isc::asiolink::IOServiceMgr::instance(), LOG_ERROR, isc::hooks::HooksManager::prepareUnloadLibraries(), and isc::hooks::HooksManager::unloadLibraries().

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## Member Function Documentation

## ◆ buildReportHandler()

ConstElementPtr isc::process::DControllerBase::buildReportHandler | ( | const std::string & | command,
|  | isc::data::ConstElementPtr | args )

handler for 'build-report' command

This method handles build-report command. It returns the config report created by meson setup which contains the compilation parameters.

Parameters

  command | (ignored)
  args | (ignored)

Returns
  answer with build report

Definition at line 743 of file d_controller.cc.

References isc::config::CONTROL_RESULT_SUCCESS, isc::config::createAnswer(), and isc::detail::getConfigReport().

Referenced by isc::d2::D2Controller::registerCommands().

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## ◆ checkConfig()

ConstElementPtr isc::process::DControllerBase::checkConfig | ( | isc::data::ConstElementPtr | new_config | ) |
| virtual

Instance method invoked by the configuration event handler and which processes the actual configuration check.

Provides behavioral path for both integrated and stand-alone modes. The current implementation will merge the configuration update into the existing configuration and then invoke the application process' configure method with a final rollback.

Parameters

  new_config | is the new configuration

Returns
  returns an Element that contains the results of configuration update composed of an integer status value (0 means successful, non-zero means failure), and a string explanation of the outcome.

Definition at line 473 of file d_controller.cc.

Referenced by checkConfigOnly(), and configTestHandler().

## ◆ checkConfigOnly()

void isc::process::DControllerBase::checkConfigOnly | ( |  | ) |
| protected

Check the configuration.

Called by `launch()` when `check_only_` mode is enabled

Exceptions

  VersionMessage | when successful but a message should be displayed
  InvalidUsage | when an error was detected

Definition at line 191 of file d_controller.cc.

References checkConfig(), getAppName(), isc::process::Daemon::getConfigFile(), handleOtherObjects(), initProcess(), isc_throw, isc::process::Daemon::loggerInit(), Element::map, isc::config::parseAnswer(), parseFile(), isc::process::Daemon::setDefaultLoggerName(), and isc::process::Daemon::setVerbose().

Referenced by launch().

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## ◆ configFromFile()

ConstElementPtr isc::process::DControllerBase::configFromFile | ( |  | ) |
| virtual

Reconfigures the process from a configuration file.

By default the file is assumed to be a JSON text file whose contents include at least:

{ "<module-name>": {<module-config>}
}
where:
module-name : is a label which uniquely identifies the
configuration data for this controller's application
module-config: a set of zero or more JSON elements which comprise
the application's configuration values

To translate the JSON content into Elements, `parseFile()` is called first. This virtual method provides derivations a means to parse the file content using an alternate parser. If it returns an empty pointer than the JSON parsing providing by Element::fromJSONFile() is called.

Once parsed, the method extracts the set of configuration elements for the module-name that matches the controller's app_name_, looks for the loggers entry and, if present uses it to configure logging. It then passes that set into `updateConfig()` (or `checkConfig()`).

The file may contain an arbitrary number of other modules.

Returns
  returns an Element that contains the results of configuration update composed of an integer status value (0 means successful, non-zero means failure), and a string explanation of the outcome.

Definition at line 377 of file d_controller.cc.

References isc::process::Daemon::configureLogger(), isc::config::CONTROL_RESULT_ERROR, isc::config::createAnswer(), Element::fromJSONFile(), getAppName(), isc::process::Daemon::getConfigFile(), handleOtherObjects(), isc_throw, Element::map, parseFile(), and updateConfig().

Referenced by configReloadHandler(), launch(), and processSignal().

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## ◆ configGetHandler()

ConstElementPtr isc::process::DControllerBase::configGetHandler | ( | const std::string & | command,
|  | isc::data::ConstElementPtr | args )

handler for config-get command

This method handles the config-get command, which retrieves the current configuration and returns it in response.

Parameters

  command | (ignored)
  args | (ignored)

Returns
  current configuration wrapped in a response

Definition at line 478 of file d_controller.cc.

References isc::config::CONTROL_RESULT_SUCCESS, Element::create(), isc::config::createAnswer(), and isc::config::BaseCommandMgr::getHash().

Referenced by isc::d2::D2Controller::registerCommands().

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## ◆ configHashGetHandler()

ConstElementPtr isc::process::DControllerBase::configHashGetHandler | ( | const std::string & | command,
|  | isc::data::ConstElementPtr | args )

handler for config-hash-get command

This method handles the config-hash-get command, which retrieves the current configuration and returns it in response.

Parameters

  command | (ignored)
  args | (ignored)

Returns
  hash of current configuration wrapped in a response

Definition at line 488 of file d_controller.cc.

References isc::config::CONTROL_RESULT_SUCCESS, Element::create(), isc::config::createAnswer(), Element::createMap(), and isc::config::BaseCommandMgr::getHash().

Referenced by isc::d2::D2Controller::registerCommands().

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## ◆ configReloadHandler()

ConstElementPtr isc::process::DControllerBase::configReloadHandler | ( | const std::string & | command,
|  | isc::data::ConstElementPtr | args )

handler for config-reload command

This method handles the config-reload command, which reloads the configuration file.

Parameters

  command | (ignored)
  args | (ignored)

Returns
  status of the command

Definition at line 630 of file d_controller.cc.

References configFromFile().

Referenced by isc::d2::D2Controller::registerCommands().

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## ◆ configSetHandler()

ConstElementPtr isc::process::DControllerBase::configSetHandler | ( | const std::string & | command,
|  | isc::data::ConstElementPtr | args )

handler for config-set command

This method handles the config-set command, which loads configuration specified in args parameter.

Parameters

  command | (ignored)
  args | configuration to be checked.

Returns
  status of the command

Definition at line 636 of file d_controller.cc.

References isc::process::Daemon::configureLogger(), isc::config::CONTROL_RESULT_ERROR, isc::config::createAnswer(), getAppName(), handleOtherObjects(), Element::map, isc::config::parseAnswer(), and updateConfig().

Referenced by isc::d2::D2Controller::registerCommands().

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## ◆ configTestHandler()

ConstElementPtr isc::process::DControllerBase::configTestHandler | ( | const std::string & | command,
|  | isc::data::ConstElementPtr | args )

handler for config-test command

This method handles the config-test command, which checks configuration specified in args parameter.

Parameters

  command | (ignored)
  args | configuration to be checked.

Returns
  status of the command

Definition at line 585 of file d_controller.cc.

References checkConfig(), isc::config::CONTROL_RESULT_ERROR, isc::config::createAnswer(), getAppName(), handleOtherObjects(), and Element::map.

Referenced by isc::d2::D2Controller::registerCommands().

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## ◆ configWriteHandler()

ConstElementPtr isc::process::DControllerBase::configWriteHandler | ( | const std::string & | command,
|  | isc::data::ConstElementPtr | args )

handler for config-write command

This handle processes config-write command, which writes the current configuration to disk. This command takes one optional parameter called filename. If specified, the current configuration will be written to that file. If not specified, the file used during Kea start-up will be used. To avoid any exploits, the target directory must be the same as a security measure against exploiting file writes remotely.

Parameters

  command | (ignored)
  args | may contain optional string argument filename

Returns
  status of the configuration file write

Definition at line 498 of file d_controller.cc.

References isc::process::Daemon::checkWriteConfigFile(), isc::config::CONTROL_RESULT_ERROR, isc::config::CONTROL_RESULT_SUCCESS, Element::create(), isc::config::createAnswer(), Element::createMap(), isc::process::Daemon::getConfigFile(), Element::map, Element::string, isc::Exception::what(), and isc::process::Daemon::writeConfigFile().

Referenced by isc::d2::D2Controller::registerCommands().

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## ◆ createProcess()

virtual DProcessBase * isc::process::DControllerBase::createProcess | ( |  | ) |
| protectedpure virtual

Abstract method that is responsible for instantiating the application process object.

It is invoked by the controller after command line argument parsing as part of the process initialization (see initProcess method).

Returns
  returns a pointer to the new process object (DProcessBase*) or NULL if the create fails. Note this value is subsequently wrapped in a smart pointer.

Referenced by initProcess().

## ◆ customOption()

bool isc::process::DControllerBase::customOption | ( | int | option,
|  | char * | optarg )
| protectedvirtual

Virtual method that provides derivations the opportunity to support additional command line options.

It is invoked during command line argument parsing (see parseArgs method) if the option is not recognized as a stock DControllerBase option.

Parameters

  option | is the option "character" from the command line, without any prefixing hyphen(s)
  optarg | is the argument value (if one) associated with the option

Returns
  must return true if the option was valid, false if it is invalid. (Note the default implementation always returns false.)

Definition at line 348 of file d_controller.cc.

Referenced by parseArgs().

## ◆ getAppName()

std::string isc::process::DControllerBase::getAppName | ( |  | ) | const
| inline

Fetches the name of the application under control.

Returns
  returns the controller service name string

Definition at line 221 of file d_controller.h.

Referenced by checkConfigOnly(), configFromFile(), configSetHandler(), configTestHandler(), and handleOtherObjects().

## ◆ getBinName()

std::string isc::process::DControllerBase::getBinName | ( |  | ) | const
| inline

Fetches the name of the application executable.

Returns
  returns the controller logger name string

Definition at line 228 of file d_controller.h.

## ◆ getController()

DControllerBasePtr & isc::process::DControllerBase::getController | ( |  | ) |
| inlinestaticprotected

Static getter which returns the singleton instance.

Returns
  returns a pointer reference to the private singleton instance member.

Definition at line 477 of file d_controller.h.

Referenced by isc::d2::D2Controller::instance(), and isc::netconf::NetconfController::instance().

## ◆ getCustomOpts()

virtual const std::string isc::process::DControllerBase::getCustomOpts | ( |  | ) | const
| inlineprotectedvirtual

Virtual method which returns a string containing the option letters for any custom command line options supported by the derivation.

These are added to the stock options of "c", "d", ..., during command line interpretation.

Returns
  returns a string containing the custom option letters.

Definition at line 408 of file d_controller.h.

Referenced by parseArgs().

## ◆ getIOService()

asiolink::IOServicePtr & isc::process::DControllerBase::getIOService | ( |  | ) |
| inlineprotected

Getter for fetching the controller's IOService.

Returns
  returns a pointer reference to the IOService.

Definition at line 469 of file d_controller.h.

Referenced by ~DControllerBase().

## ◆ getProcess()

DProcessBasePtr isc::process::DControllerBase::getProcess | ( |  | ) |
| inlineprotected

Fetches the current process.

Returns
  a pointer to the current process instance.

Definition at line 594 of file d_controller.h.

Referenced by isc::netconf::NetconfController::getNetconfProcess().

## ◆ getUsageText()

virtual const std::string isc::process::DControllerBase::getUsageText | ( |  | ) | const
| inlineprotectedvirtual

Virtual method which can be used to contribute derivation specific usage text.

It is invoked by the usage() method under invalid usage conditions.

Returns
  returns the desired text.

Definition at line 398 of file d_controller.h.

Referenced by usage().

## ◆ getVersion()

std::string isc::process::DControllerBase::getVersion | ( | bool | extended | ) |

returns Kea version on stdout and exit.

redeclaration/redefinition. isc::process::Daemon::getVersion()

Definition at line 886 of file d_controller.cc.

References isc::cryptolink::CryptoLink::getVersion(), and isc::log::Logger::getVersion().

Referenced by parseArgs(), and versionGetHandler().

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## ◆ getVersionAddendum()

virtual std::string isc::process::DControllerBase::getVersionAddendum | ( |  | ) |
| inlineprotectedvirtual

Fetches text containing additional version specifics.

This method is provided so derivations can append any additional desired information such as library dependencies to the extended version text returned when DControllerBase::getVersion(true) is invoked.

Returns
  a string containing additional version info

Definition at line 611 of file d_controller.h.

## ◆ handleOtherObjects()

std::string isc::process::DControllerBase::handleOtherObjects | ( | isc::data::ConstElementPtr | args | ) |
| protected

Deals with other (i.e.

not application name) global objects.

Code shared between configuration handlers:

- check obsolete or unknown (aka unsupported) objects.

Parameters

  args | Command arguments.

Returns
  Error message or empty string.

Definition at line 563 of file d_controller.cc.

References isc::process::DCTL_CONFIG_DEPRECATED, isc::process::dctl_logger, getAppName(), and LOG_ERROR.

Referenced by checkConfigOnly(), configFromFile(), configSetHandler(), and configTestHandler().

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## ◆ initProcess()

void isc::process::DControllerBase::initProcess | ( |  | ) |
| protected

Instantiates the application process and then initializes it.

This is the second step taken during launch, following successful command line parsing. It is used to invoke the derivation-specific implementation of createProcess, following by an invoking of the newly instantiated process's init method.

Exceptions

  throws | DControllerBaseError or indirectly DProcessBaseError if there is a failure creating or initializing the application process.

Definition at line 354 of file d_controller.cc.

References createProcess(), isc::log::DBGLVL_START_SHUT, isc::process::DCTL_INIT_PROCESS, isc::process::dctl_logger, isc_throw, and LOG_DEBUG.

Referenced by checkConfigOnly(), and launch().

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## ◆ initSignalHandling()

void isc::process::DControllerBase::initSignalHandling | ( |  | ) |
| protected

Initializes signal handling.

This method configures the controller to catch and handle signals. It instantiates a IOSignalSet which listens for SIGHUP, SIGINT, and SIGTERM.

Todo
  block everything we don't handle

Definition at line 789 of file d_controller.cc.

References DControllerBase(), and processSignal().

Referenced by launch().

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## ◆ isCheckOnly()

bool isc::process::DControllerBase::isCheckOnly | ( |  | ) | const
| inlineprotected

Supplies whether or not check only mode is enabled.

Returns
  returns true if check only is enabled.

Definition at line 453 of file d_controller.h.

Referenced by launch().

## ◆ isVerbose()

bool isc::process::DControllerBase::isVerbose | ( |  | ) | const
| inlineprotected

Supplies whether or not verbose logging is enabled.

Returns
  returns true if verbose logging is enabled.

Definition at line 439 of file d_controller.h.

## ◆ launch()

int isc::process::DControllerBase::launch | ( | int | argc,
|  | char * | argv[],
|  | const bool | test_mode )
| virtual

Acts as the primary entry point into the controller execution and provides the outermost application control logic:

1. parse command line arguments
2. instantiate and initialize the application process
3. load the configuration file
4. record the start timestamp
5. initialize signal handling
6. start and wait on the application process event loop
7. exit to the caller

It is intended to be called from main() and be given the command line arguments.

This function can be run in "test mode". It prevents initialization of module logger. This is used in unit tests which initialize logger in their main function. Such a logger uses environmental variables to control severity, verbosity etc.

Parameters

  argc | is the number of command line arguments supplied
  argv | is the array of string (char *) command line arguments
  test_mode | is a bool value which indicates if `DControllerBase::launch` should be run in the test mode (if true). This parameter doesn't have default value to force test implementers to enable test mode explicitly.

Exceptions

  throws | one of the following exceptions: InvalidUsage - Indicates invalid command line. ProcessInitError - Failed to create and initialize application process object. ProcessRunError - A fatal error occurred while in the application process event loop.

Returns
  The value from `Daemon::getExitValue()`.

Definition at line 72 of file d_controller.cc.

References isc::util::file::amRunningAsRoot(), isc::process::Daemon::checkConfigFile(), checkConfigOnly(), configFromFile(), isc::process::Daemon::createPIDFile(), isc::log::DBGLVL_START_SHUT, isc::process::DCTL_ALREADY_RUNNING, isc::process::DCTL_CONFIG_FILE_LOAD_FAIL, isc::process::DCTL_DEVELOPMENT_VERSION, isc::process::DCTL_INIT_PROCESS_FAIL, isc::process::dctl_logger, isc::process::DCTL_PID_FILE_ERROR, isc::process::DCTL_PROCESS_FAILED, isc::process::DCTL_ROOT_USER_SECURITY_WARNING, isc::process::DCTL_SHUTDOWN, isc::process::DCTL_STANDALONE, isc::process::DCTL_STARTING, isc::process::Daemon::getExitValue(), initProcess(), initSignalHandling(), isc_throw, isCheckOnly(), LOG_DEBUG, LOG_FATAL, LOG_INFO, LOG_WARN, isc::process::Daemon::loggerInit(), isc::config::parseAnswer(), parseArgs(), runProcess(), isc::process::Daemon::setDefaultLoggerName(), isc::process::Daemon::setProcName(), isc::process::Daemon::setVerbose(), isc::process::Daemon::start_, usage(), and isc::Exception::what().

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## ◆ parseArgs()

void isc::process::DControllerBase::parseArgs | ( | int | argc,
|  | char * | argv[] )
| protected

Processes the command line arguments.

It is the first step taken after the controller has been launched. It combines the stock list of options with those returned by getCustomOpts(), and uses cstdlib's getopt to loop through the command line. It handles stock options directly, and passes any custom options into the customOption method. Currently there are only some stock options -c/t for specifying the configuration file, -d for verbose logging, and -v/V/W for version reports.

Parameters

  argc | is the number of command line arguments supplied
  argv | is the array of string (char *) command line arguments

Exceptions

  InvalidUsage | when there are usage errors.
  VersionMessage | if the -v, -V or -W arguments is given.

Definition at line 255 of file d_controller.cc.

References customOption(), isc::util::file::PathChecker::enableEnforcement(), isc::detail::getConfigReport(), getCustomOpts(), getVersion(), isc_throw, and isc::process::Daemon::setConfigFile().

Referenced by launch().

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## ◆ parseFile()

ConstElementPtr isc::process::DControllerBase::parseFile | ( | const std::string & | file_name | ) |
| protectedvirtual

Parse a given file into Elements.

This method provides a means for deriving classes to use alternate parsing mechanisms to parse configuration files into the corresponding isc::data::Elements. The elements produced must be equivalent to those which would be produced by the original JSON parsing. Implementations should throw when encountering errors.

The default implementation returns an empty pointer, signifying to callers that they should submit the file to the original parser.

Parameters

  file_name | pathname of the file to parse

Returns
  pointer to the elements created

Reimplemented in isc::netconf::NetconfController.

Definition at line 66 of file d_controller.cc.

Referenced by checkConfigOnly(), and configFromFile().

## ◆ parseText()

virtual isc::data::ConstElementPtr isc::process::DControllerBase::parseText | ( | const std::string & | input | ) |
| inlineprotectedvirtual

Parse text into Elements.

This method provides a means for deriving classes to use alternate parsing mechanisms to parse configuration text into the corresponding isc::data::Elements. The elements produced must be equivalent to those which would be produced by the original JSON parsing. Implementations should throw when encountering errors.

The default implementation returns an empty pointer, signifying to callers that they should submit the text to the original parser.

Parameters

  input | text to parse

Returns
  pointer to the elements created

Definition at line 537 of file d_controller.h.

## ◆ processSignal()

void isc::process::DControllerBase::processSignal | ( | int | signum | ) |
| protectedvirtual

Application-level signal processing method.

This method is the last step in processing a OS signal occurrence. It currently supports the following signals as follows:

1. SIGHUP - instigates reloading the configuration file
2. SIGINT - instigates a graceful shutdown
3. SIGTERM - instigates a graceful shutdown If it receives any other signal, it will issue a debug statement and discard it. Derivations wishing to support additional signals could override this method with one that: processes the signal if it is one of additional signals, otherwise invoke this method (DControllerBase::processSignal()) with the signal value.
   Todo
     Provide a convenient way for derivations to register additional signals.

Reimplemented in isc::netconf::NetconfController.

Definition at line 804 of file d_controller.cc.

References configFromFile(), isc::log::DBGLVL_START_SHUT, isc::process::DCTL_CFG_FILE_RELOAD_ERROR, isc::process::DCTL_CFG_FILE_RELOAD_SIGNAL_RECVD, isc::process::dctl_logger, isc::process::DCTL_SHUTDOWN_SIGNAL_RECVD, isc::process::DCTL_UNSUPPORTED_SIGNAL, isc::process::Daemon::getConfigFile(), LOG_DEBUG, LOG_ERROR, LOG_INFO, LOG_WARN, isc::config::parseAnswer(), and shutdownHandler().

Referenced by initSignalHandling(), and isc::netconf::NetconfController::processSignal().

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## ◆ runProcess()

void isc::process::DControllerBase::runProcess | ( |  | ) |
| protected

Invokes the application process's event loop,(DBaseProcess::run).

It is called during launch only after successfully completing the requested setup: command line parsing, application initialization, and session establishment (if not stand-alone). The process event loop is expected to only return upon application shutdown either in response to the shutdown command or due to an unrecoverable error.

Definition at line 452 of file d_controller.cc.

References isc::log::DBGLVL_START_SHUT, isc::process::dctl_logger, isc::process::DCTL_RUN_PROCESS, isc_throw, and LOG_DEBUG.

Referenced by launch().

## ◆ serverTagGetHandler()

ConstElementPtr isc::process::DControllerBase::serverTagGetHandler | ( | const std::string & | command,
|  | isc::data::ConstElementPtr | args )

handler for server-tag-get command

This method handles the server-tag-get command, which retrieves the current server tag and returns it in response.

Parameters

  command | (ignored)
  args | (ignored)

Returns
  current configuration wrapped in a response

Definition at line 702 of file d_controller.cc.

References isc::config::CONTROL_RESULT_SUCCESS, Element::create(), isc::config::createAnswer(), and Element::createMap().

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## ◆ setCheckOnly()

void isc::process::DControllerBase::setCheckOnly | ( | bool | value | ) |
| inlineprotected

Method for enabling or disabling check only mode.

Todo
  this method and `setVerbose` are currently not used.

Parameters

  value | is the new value to assign the flag.

Definition at line 462 of file d_controller.h.

## ◆ setController()

void isc::process::DControllerBase::setController | ( | const DControllerBasePtr & | controller | ) |
| staticprotected

Static setter which sets the singleton instance.

Parameters

  controller | is a pointer to the singleton instance.

Exceptions

  throws | DControllerBase error if an attempt is made to set the instance a second time.

Definition at line 55 of file d_controller.cc.

References isc_throw.

Referenced by isc::d2::D2Controller::instance(), and isc::netconf::NetconfController::instance().

## ◆ setVerbose()

void isc::process::DControllerBase::setVerbose | ( | bool | value | ) |
| inlineprotected

Method for enabling or disabling verbose logging.

Parameters

  value | is the new value to assign the flag.

Definition at line 446 of file d_controller.h.

## ◆ shutdownHandler()

ConstElementPtr isc::process::DControllerBase::shutdownHandler | ( | const std::string & | command,
|  | isc::data::ConstElementPtr | args )

handler for 'shutdown' command

This method handles shutdown command. It initiates the shutdown procedure using CPL methods.

Parameters

  command | (ignored)
  args | (ignored)

Returns
  answer confirming that the shutdown procedure is started

Definition at line 748 of file d_controller.cc.

References isc::config::CONTROL_RESULT_ERROR, isc::config::createAnswer(), Element::integer, Element::map, isc::process::Daemon::setExitValue(), and shutdownProcess().

Referenced by processSignal(), and isc::d2::D2Controller::registerCommands().

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## ◆ shutdownProcess()

ConstElementPtr isc::process::DControllerBase::shutdownProcess | ( | isc::data::ConstElementPtr | args | ) |
| protected

Initiates shutdown procedure.

This method is invoked by executeCommand in response to the shutdown command. It will invoke the application process's shutdown method which causes the process to to begin its shutdown process.

Note, it is assumed that the process of shutting down is neither instantaneous nor synchronous. This method does not "block" waiting until the process has halted. Rather it is used to convey the need to shutdown. A successful return indicates that the shutdown has successfully commenced, but does not indicate that the process has actually exited.

Returns
  returns an Element that contains the results of shutdown command composed of an integer status value (0 means successful, non-zero means failure), and a string explanation of the outcome.

Parameters

  args | is a set of derivation-specific arguments (if any) for the shutdown command.

Definition at line 777 of file d_controller.cc.

References isc::config::CONTROL_RESULT_SUCCESS, isc::config::createAnswer(), isc::process::dctl_logger, isc::process::DCTL_NOT_RUNNING, and LOG_WARN.

Referenced by shutdownHandler().

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## ◆ statusGetHandler()

ConstElementPtr isc::process::DControllerBase::statusGetHandler | ( | const std::string & | command,
|  | isc::data::ConstElementPtr | args )

handler for status-get command

This method handles the status-get command, which retrieves the server process information i.e. the pid and returns it in response.

Parameters

  command | (ignored)
  args | (ignored)

Returns
  process information wrapped in a response

Definition at line 711 of file d_controller.cc.

References isc::config::CONTROL_RESULT_SUCCESS, Element::create(), isc::config::createAnswer(), Element::createMap(), and isc::process::Daemon::start_.

Referenced by isc::d2::D2Controller::registerCommands().

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## ◆ updateConfig()

ConstElementPtr isc::process::DControllerBase::updateConfig | ( | isc::data::ConstElementPtr | new_config | ) |
| virtual

Instance method invoked by the configuration event handler and which processes the actual configuration update.

Provides behavioral path for both integrated and stand-alone modes. The current implementation will merge the configuration update into the existing configuration and then invoke the application process' configure method.

Parameters

  new_config | is the new configuration

Returns
  returns an Element that contains the results of configuration update composed of an integer status value (0 means successful, non-zero means failure), and a string explanation of the outcome.

Definition at line 467 of file d_controller.cc.

Referenced by configFromFile(), and configSetHandler().

## ◆ usage()

void isc::process::DControllerBase::usage | ( | const std::string & | text | ) |
| protected

Prints the program usage text to std error.

Parameters

  text | is a string message which will preceded the usage text. This is intended to be used for specific usage violation messages.

Definition at line 837 of file d_controller.cc.

References getUsageText().

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## ◆ versionGetHandler()

ConstElementPtr isc::process::DControllerBase::versionGetHandler | ( | const std::string & | command,
|  | isc::data::ConstElementPtr | args )

handler for version-get command

This method handles the version-get command. It returns the basic and extended version.

Parameters

  command | (ignored)
  args | (ignored)

Returns
  answer with version details.

Definition at line 731 of file d_controller.cc.

References isc::config::CONTROL_RESULT_SUCCESS, Element::create(), isc::config::createAnswer(), Element::createMap(), and getVersion().

Referenced by isc::d2::D2Controller::registerCommands().

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## Friends And Related Symbol Documentation

## ◆ DControllerTest

friend class DControllerTest
| friend

Definition at line 657 of file d_controller.h.

References DControllerTest.

Referenced by DControllerTest.

The documentation for this class was generated from the following files:

- d_controller.h
- d_controller.cc