Command Manager for Control Agent. More...

#include <ca_command_mgr.h>

Inheritance diagram for isc::agent::CtrlAgentCommandMgr:

Public Member Functions
virtual isc::data::ConstElementPtr	handleCommand (const std::string &cmd_name, const isc::data::ConstElementPtr &params, const isc::data::ConstElementPtr &original_cmd)
	Handles the command having a given name and arguments.

virtual isc::data::ConstElementPtr	processCommand (const isc::data::ConstElementPtr &cmd)
	Triggers command processing.

Public Member Functions inherited from isc::config::HookedCommandMgr
	HookedCommandMgr ()
	Constructor.

Public Member Functions inherited from isc::config::BaseCommandMgr
	BaseCommandMgr ()
	Constructor.

virtual	~BaseCommandMgr ()
	Destructor.

void	deregisterAll ()
	Auxiliary method that removes all installed commands.

void	deregisterCommand (const std::string &cmd)
	Deregisters specified command handler.

void	registerCommand (const std::string &cmd, CommandHandler handler)
	Registers specified command handler for a given command.

void	registerExtendedCommand (const std::string &cmd, ExtendedCommandHandler handler)
	Registers specified command handler for a given command.

Static Public Member Functions
static CtrlAgentCommandMgr &	instance ()
	Returns sole instance of the Command Manager.

Static Public Member Functions inherited from isc::config::BaseCommandMgr
static std::string	getHash (const isc::data::ConstElementPtr &config)
	returns a hash of a given Element structure

Additional Inherited Members
Public Types inherited from isc::config::BaseCommandMgr
typedef std::function< isc::data::ConstElementPtr(const std::string &name, const isc::data::ConstElementPtr &params)>	CommandHandler
	Defines command handler type.

typedef std::function< isc::data::ConstElementPtr(const std::string &name, const isc::data::ConstElementPtr &params, const isc::data::ConstElementPtr &original)>	ExtendedCommandHandler
	Defines extended command handler type.

Protected Types inherited from isc::config::BaseCommandMgr
typedef std::map< std::string, HandlersPair >	HandlerContainer
	Type of the container for command handlers.

Protected Member Functions inherited from isc::config::HookedCommandMgr
bool	delegateCommandToHookLibrary (const std::string &cmd_name, const isc::data::ConstElementPtr &params, const isc::data::ConstElementPtr &original_cmd, isc::data::ElementPtr &answer)
	Handles the command within the hooks libraries.

Protected Member Functions inherited from isc::config::BaseCommandMgr
Protected Attributes inherited from isc::config::BaseCommandMgr
HandlerContainer	handlers_
	Container for command handlers.

Detailed Description

Command Manager for Control Agent.

This is an implementation of the Command Manager within Control Agent. In addition to the standard capabilities of the HookedCommandMgr it is also intended to forward commands to the respective Kea servers when the command is not supported directly by the Control Agent.

The CtrlAgentCommandMgr is implemented as a singleton. The commands are registered using CtrlAgentCommandMgr::instance().registerCommand(). The CtrlAgentResponseCreator uses the sole instance of the Command Manager to handle incoming commands.

Definition at line 37 of file ca_command_mgr.h.

Member Function Documentation

◆ handleCommand()

ConstElementPtr isc::agent::CtrlAgentCommandMgr::handleCommand	(	const std::string &	cmd_name,
		const isc::data::ConstElementPtr &	params,
		const isc::data::ConstElementPtr &	original_cmd )

virtual

Handles the command having a given name and arguments.

This method extends the base implementation with the ability to forward commands to Kea servers.

If the received command doesn't include 'service' parameter or this parameter is blank, the command is first handled by the attached hooks libraries, and if still unhandled, the Control Agent itself.

If the non-blank 'service' parameter has been specified the hooks are executed. If the hooks process the command the result is returned to the controlling client. Otherwise, the command is forwarded to each Kea server listed in the 'service' parameter.

Parameters

cmd_name	Command name.
params	Command arguments.
original_cmd	Original command being processed.

Returns: Pointer to the const data element representing a list of responses to the command. If the command has been handled by the CA, this list includes one response.

Reimplemented from isc::config::HookedCommandMgr.

Definition at line 64 of file ca_command_mgr.cc.

References isc::agent::agent_logger, isc::config::CONTROL_RESULT_COMMAND_UNSUPPORTED, isc::config::CONTROL_RESULT_ERROR, isc::config::CONTROL_TEXT, isc::data::Element::create(), isc::config::createAnswer(), isc::data::Element::createList(), isc::agent::CTRL_AGENT_COMMAND_FORWARD_BEGIN, isc::agent::CTRL_AGENT_COMMAND_FORWARD_FAILED, isc::agent::CTRL_AGENT_COMMAND_RECEIVED, isc::log::DBGLVL_COMMAND, isc::config::HookedCommandMgr::delegateCommandToHookLibrary(), isc::config::HookedCommandMgr::handleCommand(), isc::data::Element::list, LOG_DEBUG, LOG_INFO, isc::config::parseAnswer(), isc::data::Element::string, and isc::Exception::what().

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◆ instance()

CtrlAgentCommandMgr & isc::agent::CtrlAgentCommandMgr::instance ( )

static

Returns sole instance of the Command Manager.

Definition at line 38 of file ca_command_mgr.cc.

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

◆ processCommand()

isc::data::ConstElementPtr isc::agent::CtrlAgentCommandMgr::processCommand ( const isc::data::ConstElementPtr & cmd )

virtual

Triggers command processing.

This method overrides the BaseCommandMgr::processCommand to ensure that the response is always wrapped in a list. The base implementation returns a response map. Kea Control Agent forwards commands to multiple daemons behind it and thus it must return a list of responses from respective daemons. If an error occurs during command processing the error response must also be wrapped in a list because caller expects that CA always returns a list.

This method is an entry point for dealing with a command. Internally it calls CtrlAgentCommandMgr::handleCommand.

Parameters

cmd	Pointer to the data element representing command in JSON format.

Returns: Pointer to the response.

Reimplemented from isc::config::BaseCommandMgr.

Definition at line 48 of file ca_command_mgr.cc.

References isc::data::Element::createList(), and isc::data::Element::list.

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

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ handleCommand()

◆ instance()

◆ processCommand()