Application Controller. More...

#include <d_controller.h>

Inheritance diagram for isc::process::DControllerBase:

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.

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.

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 43 of file d_controller.cc.

◆ ~DControllerBase()

isc::process::DControllerBase::~DControllerBase ( )

virtual

Destructor.

Definition at line 834 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 output printed by configure script which contains most compilation parameters.

Parameters

command	(ignored)
args	(ignored)

Returns: answer with build report

Definition at line 719 of file d_controller.cc.

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

Referenced by isc::agent::CtrlAgentController::registerCommands(), and 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 458 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 180 of file d_controller.cc.

References checkConfig(), getAppName(), isc::process::Daemon::getConfigFile(), handleOtherObjects(), initProcess(), isc_throw, isc::process::Daemon::loggerInit(), isc::data::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 362 of file d_controller.cc.

References isc::process::Daemon::configureLogger(), isc::config::CONTROL_RESULT_ERROR, isc::config::createAnswer(), isc::data::Element::fromJSONFile(), getAppName(), isc::process::Daemon::getConfigFile(), handleOtherObjects(), isc_throw, isc::data::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 463 of file d_controller.cc.

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

Referenced by isc::agent::CtrlAgentController::registerCommands(), and 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 473 of file d_controller.cc.

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

Referenced by isc::agent::CtrlAgentController::registerCommands(), and 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 606 of file d_controller.cc.

References configFromFile().

Referenced by isc::agent::CtrlAgentController::registerCommands(), and 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 612 of file d_controller.cc.

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

Referenced by isc::agent::CtrlAgentController::registerCommands(), and 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 561 of file d_controller.cc.

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

Referenced by isc::agent::CtrlAgentController::registerCommands(), and 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 path is always relative and .. is not allowed in the filename. This is 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 483 of file d_controller.cc.

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

Referenced by isc::agent::CtrlAgentController::registerCommands(), and 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 333 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()

static 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::agent::CtrlAgentController::instance(), 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::agent::CtrlAgentController::getCtrlAgentProcess(), and 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 861 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 539 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 339 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 765 of file d_controller.cc.

References 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:

parse command line arguments
instantiate and initialize the application process
load the configuration file
record the start timestamp
initialize signal handling
start and wait on the application process event loop
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 68 of file d_controller.cc.

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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 244 of file d_controller.cc.

References customOption(), 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::agent::CtrlAgentController, and isc::netconf::NetconfController.

Definition at line 62 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:

SIGHUP - instigates reloading the configuration file
SIGINT - instigates a graceful shutdown
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 780 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 437 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 678 of file d_controller.cc.

References isc::config::CONTROL_RESULT_SUCCESS, isc::data::Element::create(), isc::config::createAnswer(), and isc::data::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 51 of file d_controller.cc.

References isc_throw.

Referenced by isc::agent::CtrlAgentController::instance(), 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 724 of file d_controller.cc.

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

Referenced by processSignal(), isc::agent::CtrlAgentController::registerCommands(), 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 753 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 687 of file d_controller.cc.

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

Referenced by isc::agent::CtrlAgentController::registerCommands(), and 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 452 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 813 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 707 of file d_controller.cc.

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

Referenced by isc::agent::CtrlAgentController::registerCommands(), and 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.

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

Public Member Functions

Protected Member Functions

Static Protected Member Functions

Friends

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ DControllerBase()

◆ ~DControllerBase()

Member Function Documentation

◆ buildReportHandler()

◆ checkConfig()

◆ checkConfigOnly()

◆ configFromFile()

◆ configGetHandler()

◆ configHashGetHandler()

◆ configReloadHandler()

◆ configSetHandler()

◆ configTestHandler()

◆ configWriteHandler()

◆ createProcess()

◆ customOption()

◆ getAppName()

◆ getBinName()

◆ getController()

◆ getCustomOpts()

◆ getIOService()

◆ getProcess()

◆ getUsageText()

◆ getVersion()

◆ getVersionAddendum()

◆ handleOtherObjects()

◆ initProcess()

◆ initSignalHandling()

◆ isCheckOnly()

◆ isVerbose()

◆ launch()

◆ parseArgs()

◆ parseFile()

◆ parseText()

◆ processSignal()

◆ runProcess()

◆ serverTagGetHandler()

◆ setCheckOnly()

◆ setController()

◆ setVerbose()

◆ shutdownHandler()

◆ shutdownProcess()

◆ statusGetHandler()

◆ updateConfig()

◆ usage()

◆ versionGetHandler()

Friends And Related Symbol Documentation

◆ DControllerTest