Client class translation between YANG and JSON. More...

#include <translator_class.h>

Inheritance diagram for isc::yang::TranslatorClass:

Public Member Functions
	TranslatorClass (sysrepo::Session session, const std::string &model)
	Constructor.

virtual	~TranslatorClass ()=default
	Destructor.

isc::data::ElementPtr	getClass (libyang::DataNode const &data_node)
	Translate a client class from YANG to JSON.

isc::data::ElementPtr	getClassFromAbsoluteXpath (std::string const &xpath)
	Translate a client class from YANG to JSON.

void	setClass (const std::string &xpath, isc::data::ConstElementPtr elem)
	Translate and set client class from JSON to YANG.

Public Member Functions inherited from isc::yang::TranslatorOptionDataList
	TranslatorOptionDataList (sysrepo::Session session, const std::string &model)
	Constructor.

virtual	~TranslatorOptionDataList ()=default
	Destructor.

isc::data::ConstElementPtr	getOptionDataList (libyang::DataNode const &data_node)
	Translate option data list from YANG to JSON.

isc::data::ConstElementPtr	getOptionDataListFromAbsoluteXpath (std::string const &xpath)
	Translate option data list from YANG to JSON.

void	setOptionDataList (const std::string &xpath, isc::data::ConstElementPtr elem)
	Translate and set option data list from JSON to YANG.

Public Member Functions inherited from isc::yang::TranslatorOptionData
	TranslatorOptionData (sysrepo::Session session, const std::string &model)
	Constructor.

virtual	~TranslatorOptionData ()=default
	Destructor.

isc::data::ElementPtr	getOptionData (libyang::DataNode const &data_node)
	Translate an option data from YANG to JSON.

isc::data::ElementPtr	getOptionDataFromAbsoluteXpath (std::string const &xpath)
	Translate an option data from YANG to JSON.

void	setOptionData (const std::string &xpath, isc::data::ConstElementPtr elem)
	Translate and set option data from JSON to YANG.

Public Member Functions inherited from isc::yang::Translator
	Translator (sysrepo::Session session, const std::string &model)
	Constructor.

virtual	~Translator ()=default
	Destructor.

template<typename T>
void	checkAndGet (isc::data::ElementPtr const &storage, libyang::DataNode const &data_node, std::string const &xpath, T translate) const
	Calls {translate} for the element found at {xpath} relative to {data_node} and sets the result in {storage} with the {xpath} key.

void	checkAndGetAndJsonifyLeaf (isc::data::ElementPtr &storage, libyang::DataNode const &data_node, const std::string &name) const
	Retrieves a child YANG data node identified by name from the given parent YANG container node, converts it from string to JSON and stores it in the specified storage.

template<typename T>
void	checkAndGetDiverging (isc::data::ElementPtr const &storage, libyang::DataNode const &data_node, std::string const &key, std::string const &xpath, T translate) const
	Calls {translate} for the element found at {xpath} relative to {data_node} and sets the result in {storage} with the {key} key.

void	checkAndGetDivergingLeaf (isc::data::ElementPtr &storage, libyang::DataNode const &data_node, std::string const &name, std::string const &yang_name) const
	Retrieves a child YANG data node identified by name from the given parent YANG container node and stores it in the specified storage.

void	checkAndGetLeaf (isc::data::ElementPtr &storage, libyang::DataNode const &data_node, std::string const &name) const
	Retrieves a child YANG data node identified by name from the given parent YANG container node and stores it in the specified storage.

void	checkAndSetDivergingLeaf (isc::data::ConstElementPtr const &from, std::string const &xpath, std::string const &name, std::string const &yang_name, libyang::LeafBaseType const type)
	Get an element from given ElementPtr node and set it in sysrepo at given xpath.

void	checkAndSetLeaf (isc::data::ConstElementPtr const &from, std::string const &xpath, std::string const &name, libyang::LeafBaseType const type)
	Get an element from given ElementPtr node and set it in sysrepo at given xpath.

void	checkAndSetLeafList (isc::data::ConstElementPtr const &from, std::string const &xpath, std::string const &name, libyang::LeafBaseType const type)
	Get an element from given ElementPtr node and set it in sysrepo at given xpath as a leaf-list.

void	checkAndSetUserContext (isc::data::ConstElementPtr const &from, std::string const &xpath)
	Get an element from given ElementPtr node and set it in sysrepo at given xpath.

void	checkAndStringifyAndSetLeaf (isc::data::ConstElementPtr const &from, std::string const &xpath, std::string const &name)
	Get an element from given ElementPtr node and set it in sysrepo at given xpath.

void	deleteItem (const std::string &xpath)
	Delete basic value from YANG.

libyang::DataNode	findXPath (std::string const &xpath) const
	Retrieves a YANG data node by xpath.

template<typename functor_t>
void	forAll (std::string const &xpath, functor_t f) const
	Run a function for a node and all its children.

std::optional< libyang::DataNode >	getData (std::string const &xpath) const
	Get a YANG data node found at the given absolute xpath.

isc::data::ElementPtr	getItem (libyang::DataNode const &data_node, std::string const &xpath) const
	Translate a basic value from YANG to JSON for a given xpath that is relative to the given source node.

isc::data::ElementPtr	getItemFromAbsoluteXpath (std::string const &xpath) const
	Translate a basic value from YANG to JSON for a given absolute xpath.

template<typename T>
isc::data::ElementPtr	getList (libyang::DataNode const &data_node, std::string const &xpath, T &t, isc::data::ElementPtr(T::*f)(libyang::DataNode const &)) const
	Retrieve a list as ElementPtr from sysrepo from a certain xpath.

void	getMandatoryDivergingLeaf (isc::data::ElementPtr &storage, libyang::DataNode const &data_node, std::string const &name, std::string const &yang_name) const
	Retrieves a child YANG data node identified by one name from the given parent YANG container node and stores it in the specified storage under a different name.

void	getMandatoryLeaf (isc::data::ElementPtr &storage, libyang::DataNode const &data_node, std::string const &name) const
	Retrieves a child YANG data node identified by name from the given parent YANG container node and stores it in the specified storage.

bool	schemaNodeExists (std::string const &xpath) const
	Checks whether a YANG node exists in the schema.

void	setItem (const std::string &xpath, isc::data::ConstElementPtr const elem, libyang::LeafBaseType const type)
	Translate and set basic value from JSON to YANG.

void	setMandatoryDivergingLeaf (isc::data::ConstElementPtr const &from, std::string const &xpath, std::string const &name, std::string const &yang_name, libyang::LeafBaseType const type)
	Get an element from given ElementPtr node and set it in sysrepo at given xpath.

void	setMandatoryLeaf (isc::data::ConstElementPtr const &from, std::string const &xpath, std::string const &name, libyang::LeafBaseType const type)
	Get an element from given ElementPtr node and set it in sysrepo at given xpath.

Public Member Functions inherited from isc::yang::TranslatorOptionDefList
	TranslatorOptionDefList (sysrepo::Session session, const std::string &model)
	Constructor.

virtual	~TranslatorOptionDefList ()=default
	Destructor.

isc::data::ConstElementPtr	getOptionDefList (libyang::DataNode const &data_node)
	Translate option definition list from YANG to JSON.

isc::data::ConstElementPtr	getOptionDefListFromAbsoluteXpath (std::string const &xpath)
	Translate option definition list from YANG to JSON.

void	setOptionDefList (const std::string &xpath, isc::data::ConstElementPtr elem)
	Translate and set option definition list from JSON to YANG.

Public Member Functions inherited from isc::yang::TranslatorOptionDef
	TranslatorOptionDef (sysrepo::Session session, const std::string &model)
	Constructor.

virtual	~TranslatorOptionDef ()=default
	Destructor.

isc::data::ElementPtr	getOptionDef (libyang::DataNode const &data_node)
	Translate an option definition from YANG to JSON.

isc::data::ElementPtr	getOptionDefFromAbsoluteXpath (std::string const &xpath)
	Translate an option definition from YANG to JSON.

void	setOptionDef (const std::string &xpath, isc::data::ConstElementPtr elem)
	Translate and set option definition from JSON to YANG.

Protected Member Functions
isc::data::ElementPtr	getClassKea (libyang::DataNode const &data_node)
	getClass JSON for kea-dhcp[46].

void	setClassKea (const std::string &xpath, isc::data::ConstElementPtr elem)
	setClass for kea-dhcp[46].

Protected Member Functions inherited from isc::yang::TranslatorOptionDataList
isc::data::ConstElementPtr	getOptionDataListKea (libyang::DataNode const &data_node)
	getOptionDataList for kea-dhcp[46].

void	setOptionDataListKea (const std::string &xpath, isc::data::ConstElementPtr elem)
	setOptionDataList for kea-dhcp[46].

Protected Member Functions inherited from isc::yang::TranslatorOptionData
isc::data::ElementPtr	getOptionDataKea (libyang::DataNode const &data_node)
	getOptionData JSON for kea-dhcp[46].

void	setOptionDataKea (const std::string &xpath, isc::data::ConstElementPtr elem)
	setOptionData for kea-dhcp[46].

Protected Member Functions inherited from isc::yang::TranslatorOptionDefList
isc::data::ConstElementPtr	getOptionDefListKea (libyang::DataNode const &data_node)
	getOptionDefList implementation specific to kea-dhcp[46]-server models.

void	setOptionDefListKea (const std::string &xpath, isc::data::ConstElementPtr elem)
	setOptionDefList implementation specific to kea-dhcp[46]-server models.

Protected Member Functions inherited from isc::yang::TranslatorOptionDef
isc::data::ElementPtr	getOptionDefKea (libyang::DataNode const &data_node)
	getOptionDef implementation specific to kea-dhcp[46]-server models.

void	setOptionDefKea (const std::string &xpath, isc::data::ConstElementPtr elem)
	setOptionDef implementation specific to kea-dhcp[46]-server models.

Additional Inherited Members
Static Public Member Functions inherited from isc::yang::Translator
static isc::data::ElementPtr	translateFromYang (std::optional< libyang::DataNode > data_node)
	Translate basic value from the given YANG data node to JSON element.

static std::optional< std::string >	translateToYang (isc::data::ConstElementPtr const &elem, libyang::LeafBaseType const type)
	Translate basic value from JSON to YANG.

Protected Types inherited from isc::yang::Translator
using	Deserializer
	Maps YANG types to functions that transform a YANG type into an ElementPtr.

using	Serializer
	Maps YANG types to functions that transform the string representation of an Element into a string that can be passed into Session::setItem().

Static Protected Member Functions inherited from isc::yang::Translator
static std::string	decode64 (std::string const &input)
	Decode a YANG element of binary type to a string that can be stored in an Element::string JSON.

static std::string	encode64 (std::string const &input)
	Encode a string such that it can be stored in a YANG element of binary type.

static Deserializer	initializeDeserializer ()
	Initializes the deserializer which is used to translate a YANG node to an ElementPtr.

static Serializer	initializeSerializer ()
	Initializes the serializer which is used to translate the string value of an Element to a string that can be passed into Session::setItem().

Protected Attributes inherited from isc::yang::Translator
std::string	model_
	The model.

sysrepo::Session	session_
	The sysrepo session.

Detailed Description

Client class translation between YANG and JSON.

JSON syntax for all Kea servers with client class is:

{
    "name": <name>,
    "test": <test expression>,
    "only-if-required": <only if required flag>,
    "option-data": <option data list>,
    (DHCPv4 only)
    "option-def": <option definition list>,
    "next-server": <next server address>,
    "server-hostname": <server hostname>,
    "boot-file-name": <boot filename>,
    "user-context": { <json map> },
    "comment": <comment>
}

YANG syntax for kea-dhcp[46] is with the name as the list key:

+--rw client-class* [name]
   +--rw name                  string
   +--rw test?                 string
   +--rw only-if-required?     boolean
   +--rw option-def* [code space]
   +--rw option-data* [code space]
   +--rw next-server?          inet:ipv4-address
   +--rw server-hostname?      string
   +--rw boot-file-name?       string
   +--rw valid-lifetime?       uint32
   +--rw min-valid-lifetime?   uint32
   +--rw max-valid-lifetime?   uint32
   +--rw user-context?         user-context

An example in JSON and YANG formats:

[
    {
        "name": "foo",
        "test": "''==''",
        "only-if-required": false
    }
]

/kea-dhcp6-server:config (container)
/kea-dhcp6-server:config/client-class[name='foo'] (list instance)
/kea-dhcp6-server:config/client-class[name='foo']/name = foo
/kea-dhcp6-server:config/client-class[name='foo']/test = ''==''
/kea-dhcp6-server:config/client-class[name='foo']/only-if-required = false

A translator class for converting a client class between YANG and JSON.

Currently supports only kea-dhcp[46]-server. Ietf-dhcpv6-server does not define client class contents.

Definition at line 75 of file translator_class.h.

Constructor & Destructor Documentation

◆ TranslatorClass()

isc::yang::TranslatorClass::TranslatorClass	(	sysrepo::Session	session,
		const std::string &	model )

Constructor.

Parameters

session	Sysrepo session.
model	Model name.

Definition at line 22 of file translator_class.cc.

References isc::yang::TranslatorOptionDataList::TranslatorOptionDataList(), and isc::yang::TranslatorOptionDefList::TranslatorOptionDefList().

Referenced by isc::yang::TranslatorClasses::TranslatorClasses().

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◆ ~TranslatorClass()

virtual isc::yang::TranslatorClass::~TranslatorClass ( )

virtualdefault

Destructor.

Member Function Documentation

◆ getClass()

ElementPtr isc::yang::TranslatorClass::getClass ( libyang::DataNode const & data_node )

Translate a client class from YANG to JSON.

Parameters

data_node the YANG node representing the class

Returns: the JSON representation of the class

Exceptions

NetconfError when sysrepo raises an error.

Definition at line 31 of file translator_class.cc.

References getClassKea(), isc_throw, isc::yang::Translator::model_, and isc::Exception::what().

Referenced by isc::yang::TranslatorClasses::getClassesKea(), and getClassFromAbsoluteXpath().

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◆ getClassFromAbsoluteXpath()

ElementPtr isc::yang::TranslatorClass::getClassFromAbsoluteXpath ( std::string const & xpath )

Translate a client class from YANG to JSON.

Note: This is a computationally expensive operation that makes a lookup in the sysrepo datastore by calling Session::getData(). It should be used sparingly in production code, mainly to get an initial data node to work with. It may be used at will in unit tests. Use getClass(libyang::DataNode) as a scalable alternative.

Parameters

xpath the xpath of the class