Cassandra host data source. More...

#include <cql_host_data_source.h>

Inheritance diagram for isc::dhcp::CqlHostDataSource:

Public Member Functions
	CqlHostDataSource (const db::DatabaseConnection::ParameterMap &parameters)
	Constructor. More...

virtual	~CqlHostDataSource ()
	Virtual destructor. More...

virtual void	add (const HostPtr &host) override
	Adds a new host to the collection. More...

virtual void	commit () override
	Commit Transactions. More...

virtual bool	del (const SubnetID &subnet_id, const asiolink::IOAddress &addr) override
	Attempts to delete a host by (subnet-id, address) More...

virtual bool	del4 (const SubnetID &subnet_id, const Host::IdentifierType &identifier_type, const uint8_t *identifier_begin, const size_t identifier_len) override
	Attempts to delete a host by (subnet-id4, identifier-type, identifier). More...

virtual bool	del6 (const SubnetID &subnet_id, const Host::IdentifierType &identifier_type, const uint8_t *identifier_begin, const size_t identifier_len) override
	Attempts to delete a host by (subnet-id6, identifier-type, identifier). More...

virtual ConstHostPtr	get4 (const SubnetID &subnet_id, const asiolink::IOAddress &address) const override
	Retrieves a Host connected to an IPv4 subnet. More...

virtual ConstHostPtr	get4 (const SubnetID &subnet_id, const Host::IdentifierType &identifier_type, const uint8_t *identifier_begin, const size_t identifier_len) const override
	Retrieves a Host connected to an IPv4 subnet. More...

virtual ConstHostPtr	get6 (const asiolink::IOAddress &prefix, const uint8_t prefix_len) const override
	Returns a Host with the specified reservation prefix. More...

virtual ConstHostPtr	get6 (const SubnetID &subnet_id, const asiolink::IOAddress &address) const override
	Returns a host connected to the IPv6 subnet and having a reservation for a specified IPv6 address or prefix. More...

virtual ConstHostPtr	get6 (const SubnetID &subnet_id, const Host::IdentifierType &identifier_type, const uint8_t *identifier_begin, const size_t identifier_len) const override
	Returns a Host connected to an IPv6 subnet. More...

virtual ConstHostCollection	getAll (const Host::IdentifierType &identifier_type, const uint8_t *identifier_begin, const size_t identifier_len) const override
	Return all hosts connected to any subnet for which reservations have been made using a specified identifier. More...

virtual ConstHostCollection	getAll4 (const asiolink::IOAddress &address) const override
	Returns a collection of hosts using the specified IPv4 address. More...

virtual ConstHostCollection	getAllHosts () const
	Returns a collection of all the hosts. More...

virtual std::string	getDescription () const
	Returns textual description of the backend. More...

virtual std::string	getName () const
	Returns the name of the database. More...

virtual std::string	getType () const override
	Return backend type. More...

virtual db::VersionPair	getVersion () const
	Retrieves schema version from the DB. More...

virtual void	rollback () override
	Rollback Transactions. More...

Public Member Functions inherited from isc::dhcp::BaseHostDataSource
virtual	~BaseHostDataSource ()
	Default destructor implementation. More...

Additional Inherited Members
Public Types inherited from isc::dhcp::BaseHostDataSource
enum	IdType { ID_HWADDR = 0, ID_DUID = 1 }
	Specifies the type of an identifier. More...

Detailed Description

Cassandra host data source.

Implements isc::dhcp::BaseHostDataSource interface customized to Cassandra. Use of this backend implies that a Cassandra database is available and that the Kea schema has been created within it.

The database schema is radically different than the MySQL and the PostgreSQL schemas. Rather than creating a different table for hosts, reservations, DHCPv4 options and DHCPv6 options respectively, the data is denormalized into a single table to benefit from Cassandra's non-relational nature. To make up for the lack of relations, on insertion, the reservations and options are matched against hosts on the server and merged into database entries. When retrieving, each database row is split into the corresponding host, reservation and options.

There can be an inconsistency in the database due to the order of the changes e.g. if you insert a host with no reservations and no options followed by the same host with one reservation will result in 2 entries versus inserting the host with reservation from the beginning which will result in a single entry. In spite of this, retrieving the host will give you the attached reservation in both cases.

Definition at line 56 of file cql_host_data_source.h.

Constructor & Destructor Documentation

◆ CqlHostDataSource()

isc::dhcp::CqlHostDataSource::CqlHostDataSource ( const db::DatabaseConnection::ParameterMap & parameters )

explicit

Constructor.

Uses the following keywords in the parameters passed to it to connect to the database:

keyspace
host
user
password
contact-points
reconnect-wait-time
connect-timeout
request-timeout
tcp-keepalive
tcp-nodelay

For details regarding those paraemters, see isc::db::CqlConnection::openDatabase.

Finally, all the CQL commands are pre-compiled.

Parameters

parameters a data structure relating keywords and values concerned with the database.

Exceptions

isc::db::NoDatabaseName	Mandatory database name not given
isc::db::DbOpenError	Error opening the database or if the schema version is invalid.
isc::db::DbOperationError	An operation on the open database has failed.

Definition at line 2053 of file cql_host_data_source.cc.

◆ ~CqlHostDataSource()

isc::dhcp::CqlHostDataSource::~CqlHostDataSource ( )

virtual

Virtual destructor.

Releases prepared CQL statements used by the backend.

Definition at line 2057 of file cql_host_data_source.cc.

Member Function Documentation

◆ add()

void isc::dhcp::CqlHostDataSource::add ( const HostPtr & host )

overridevirtual

Adds a new host to the collection.

The implementations of this method should guard against duplicate reservations for the same Host, where possible. For example, when the reservation for the same HWAddr and SubnetID is added twice, add() should throw a db::DuplicateEntry exception. Note, that usually it is impossible to guard against adding duplicated Host, where one instance is identified by different identifier types.

Parameters

host	pointer to the new Host being added.

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2062 of file cql_host_data_source.cc.

References isc::dhcp::DHCPSRV_DBG_TRACE_DETAIL, isc::dhcp::dhcpsrv_logger, isc::dhcp::CqlHostDataSourceImpl::insertOrDelete(), and LOG_DEBUG.

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◆ commit()

void isc::dhcp::CqlHostDataSource::commit ( )

overridevirtual

Commit Transactions.

Commits all pending database operations (no-op for Cassandra)

Reimplemented from isc::dhcp::BaseHostDataSource.

Definition at line 2182 of file cql_host_data_source.cc.

References isc::dhcp::DHCPSRV_DBG_TRACE_DETAIL, isc::dhcp::dhcpsrv_logger, and LOG_DEBUG.

◆ del()

bool isc::dhcp::CqlHostDataSource::del	(	const SubnetID &	subnet_id,
		const asiolink::IOAddress &	addr
	)

overridevirtual

Attempts to delete a host by (subnet-id, address)

This method supports both v4 and v6.

Parameters

subnet_id	subnet identfier.
addr	specified address.

Returns: true if deletion was successful, false if the host was not there.

Exceptions

various exceptions in case of errors

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2069 of file cql_host_data_source.cc.

References isc::dhcp::CqlHostDataSourceImpl::get4(), and isc::dhcp::CqlHostDataSourceImpl::insertOrDelete().

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◆ del4()

bool isc::dhcp::CqlHostDataSource::del4	(	const SubnetID &	subnet_id,
		const Host::IdentifierType &	identifier_type,
		const uint8_t *	identifier_begin,
		const size_t	identifier_len
	)

overridevirtual

Attempts to delete a host by (subnet-id4, identifier-type, identifier).

This method supports v4 hosts only.

Parameters

subnet_id	IPv4 Subnet identifier.
identifier_type	Identifier type.
identifier_begin	Pointer to a beginning of a buffer containing an identifier.
identifier_len	Identifier length.

Returns: true if deletion was successful, false if the host was not there.

Exceptions

various exceptions in case of errors

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2076 of file cql_host_data_source.cc.

References isc::dhcp::CqlHostDataSourceImpl::get4(), and isc::dhcp::CqlHostDataSourceImpl::insertOrDelete().

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◆ del6()

bool isc::dhcp::CqlHostDataSource::del6	(	const SubnetID &	subnet_id,
		const Host::IdentifierType &	identifier_type,
		const uint8_t *	identifier_begin,
		const size_t	identifier_len
	)

overridevirtual

Attempts to delete a host by (subnet-id6, identifier-type, identifier).

This method supports v6 hosts only.

Parameters

subnet_id	IPv6 Subnet identifier.
identifier_type	Identifier type.
identifier_begin	Pointer to a beginning of a buffer containing an identifier.
identifier_len	Identifier length.

Returns: true if deletion was successful, false if the host was not there.

Exceptions

various exceptions in case of errors

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2085 of file cql_host_data_source.cc.

References isc::dhcp::CqlHostDataSourceImpl::get6(), and isc::dhcp::CqlHostDataSourceImpl::insertOrDelete().

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◆ get4() [1/2]

ConstHostPtr isc::dhcp::CqlHostDataSource::get4	(	const SubnetID &	subnet_id,
		const asiolink::IOAddress &	address
	)		const

overridevirtual

Retrieves a Host connected to an IPv4 subnet.

The host is identifier by specified IPv4 address.

Parameters

subnet_id	Subnet identifier.
address	reserved IPv4 address.

Returns: Const Host object

Exceptions

BadValue if address in not a valid IPv4address

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2121 of file cql_host_data_source.cc.

References isc::dhcp::DHCPSRV_DBG_TRACE_DETAIL, isc::dhcp::dhcpsrv_logger, isc::dhcp::CqlHostDataSourceImpl::get4(), and LOG_DEBUG.

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◆ get4() [2/2]

ConstHostPtr isc::dhcp::CqlHostDataSource::get4	(	const SubnetID &	subnet_id,
		const Host::IdentifierType &	identifier_type,
		const uint8_t *	identifier_begin,
		const size_t	identifier_len
	)		const

overridevirtual

Retrieves a Host connected to an IPv4 subnet.

The host is identified by specific identifier.

Parameters

subnet_id	subnet identifier to filter by
identifier_type	identifier type to filter by
identifier_begin	pointer to the beginning of a buffer containing a host identifier to filter by
identifier_len	length of the host identifier buffer

Returns: Host object for which a reservation has been made using the specified identifier

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2110 of file cql_host_data_source.cc.

References isc::dhcp::DHCPSRV_DBG_TRACE_DETAIL, isc::dhcp::dhcpsrv_logger, isc::dhcp::CqlHostDataSourceImpl::get4(), and LOG_DEBUG.

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◆ get6() [1/3]

ConstHostPtr isc::dhcp::CqlHostDataSource::get6	(	const asiolink::IOAddress &	prefix,
		const uint8_t	prefix_len
	)		const

overridevirtual

Returns a Host with the specified reservation prefix.

Parameters

prefix	IPv6 prefix for which the Host object is searched.
prefix_len	IPv6 prefix length.

Returns: Const Host object using a specified IPv6 prefix.

Exceptions

MultipleRecords if two or more rows are returned from the Cassandra database

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2139 of file cql_host_data_source.cc.

References isc::dhcp::DHCPSRV_DBG_TRACE_DETAIL, isc::dhcp::dhcpsrv_logger, isc::dhcp::CqlHostDataSourceImpl::get6(), and LOG_DEBUG.

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◆ get6() [2/3]

ConstHostPtr isc::dhcp::CqlHostDataSource::get6	(	const SubnetID &	subnet_id,
		const asiolink::IOAddress &	address
	)		const

overridevirtual

Returns a host connected to the IPv6 subnet and having a reservation for a specified IPv6 address or prefix.

Parameters

subnet_id	Subnet identifier.
address	reserved IPv6 address/prefix.

Returns: Const Host object using a specified IPv6 address/prefix.

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2147 of file cql_host_data_source.cc.

References isc::dhcp::DHCPSRV_DBG_TRACE_DETAIL, isc::dhcp::dhcpsrv_logger, isc::dhcp::CqlHostDataSourceImpl::get6(), and LOG_DEBUG.

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◆ get6() [3/3]

ConstHostPtr isc::dhcp::CqlHostDataSource::get6	(	const SubnetID &	subnet_id,
		const Host::IdentifierType &	identifier_type,
		const uint8_t *	identifier_begin,
		const size_t	identifier_len
	)		const

overridevirtual

Returns a Host connected to an IPv6 subnet.

Parameters

subnet_id	subnet identifier to filter by
identifier_type	identifier type to filter by
identifier_begin	pointer to the beginning of a buffer containing a host identifier to filter by
identifier_len	length of the host identifier buffer

Returns: Const Host object for which reservation has been made using the specified identifier.

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2129 of file cql_host_data_source.cc.

References isc::dhcp::DHCPSRV_DBG_TRACE_DETAIL, isc::dhcp::dhcpsrv_logger, isc::dhcp::CqlHostDataSourceImpl::get6(), and LOG_DEBUG.

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◆ getAll()

ConstHostCollection isc::dhcp::CqlHostDataSource::getAll	(	const Host::IdentifierType &	identifier_type,
		const uint8_t *	identifier_begin,
		const size_t	identifier_len
	)		const

overridevirtual

Return all hosts connected to any subnet for which reservations have been made using a specified identifier.

This method returns all Host objects which represent reservations for a specified identifier. This method may return multiple hosts because a particular client may have reservations in multiple subnets.

Parameters

identifier_type	Identifier type.
identifier_begin	Pointer to a beginning of a buffer containing an identifier.
identifier_len	Identifier length.

Returns: Collection of const Host objects.

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2094 of file cql_host_data_source.cc.

References isc::dhcp::DHCPSRV_DBG_TRACE_DETAIL, isc::dhcp::dhcpsrv_logger, isc::dhcp::CqlHostDataSourceImpl::getAll(), and LOG_DEBUG.

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◆ getAll4()

ConstHostCollection isc::dhcp::CqlHostDataSource::getAll4 ( const asiolink::IOAddress & address ) const

overridevirtual

Returns a collection of hosts using the specified IPv4 address.

This method may return multiple Host objects if they are connected to different subnets.

Parameters

address IPv4 address for which the Host object is searched.

Returns: Collection of const Host objects.

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2103 of file cql_host_data_source.cc.

References isc::dhcp::DHCPSRV_DBG_TRACE_DETAIL, isc::dhcp::dhcpsrv_logger, isc::dhcp::CqlHostDataSourceImpl::getAll4(), and LOG_DEBUG.

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◆ getAllHosts()

ConstHostCollection isc::dhcp::CqlHostDataSource::getAllHosts ( ) const

virtual

Returns a collection of all the hosts.

This method may return multiple Host objects. It is only used in testing. It may be very slow when running on a production server with lots of hosts.

Returns: Collection of const Host objects.

Definition at line 2155 of file cql_host_data_source.cc.

References isc::dhcp::CqlHostDataSourceImpl::getAllHosts().

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◆ getDescription()

std::string isc::dhcp::CqlHostDataSource::getDescription ( ) const

virtual

Returns textual description of the backend.

Returns: Description of the backend.

Definition at line 2170 of file cql_host_data_source.cc.

◆ getName()

std::string isc::dhcp::CqlHostDataSource::getName ( ) const

virtual

Returns the name of the database.

Returns: database name

Definition at line 2165 of file cql_host_data_source.cc.

References isc::dhcp::CqlHostDataSourceImpl::getName().

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◆ getType()

std::string isc::dhcp::CqlHostDataSource::getType ( ) const

overridevirtual

Return backend type.

Returns: backend type "cql"

Implements isc::dhcp::BaseHostDataSource.

Definition at line 2160 of file cql_host_data_source.cc.

◆ getVersion()

VersionPair isc::dhcp::CqlHostDataSource::getVersion ( ) const

virtual

Retrieves schema version from the DB.

Returns: Version number stored in the database, as a pair of unsigned integers. "first" is the major version number, "second" is the minor version number.

Exceptions

isc::db::DbOperationError An operation on the open database has failed.

Definition at line 2175 of file cql_host_data_source.cc.

References isc::dhcp::DHCPSRV_DBG_TRACE_DETAIL, isc::dhcp::dhcpsrv_logger, isc::dhcp::CqlHostDataSourceImpl::getVersion(), and LOG_DEBUG.

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◆ rollback()

void isc::dhcp::CqlHostDataSource::rollback ( )

overridevirtual

Rollback Transactions.

Rolls back all pending database operations (no-op for Cassandra)

Reimplemented from isc::dhcp::BaseHostDataSource.

Definition at line 2187 of file cql_host_data_source.cc.

References isc::dhcp::DHCPSRV_DBG_TRACE_DETAIL, isc::dhcp::dhcpsrv_logger, and LOG_DEBUG.

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

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ CqlHostDataSource()

◆ ~CqlHostDataSource()

Member Function Documentation

◆ add()

◆ commit()

◆ del()

◆ del4()

◆ del6()

◆ get4() [1/2]

◆ get4() [2/2]

◆ get6() [1/3]

◆ get6() [2/3]

◆ get6() [3/3]

◆ getAll()

◆ getAll4()

◆ getAllHosts()

◆ getDescription()

◆ getName()

◆ getType()

◆ getVersion()

◆ rollback()