Implementation of the PgSqlHostDataSource. More...

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

	~PgSqlHostDataSourceImpl ()
	Destructor. More...

void	addOption (PgSqlHostContextPtr &ctx, const PgSqlHostDataSourceImpl::StatementIndex &stindex, const OptionDescriptor &opt_desc, const std::string &opt_space, const Optional< SubnetID > &subnet_id, const HostID &host_id)
	Inserts a single DHCP option into the database. More...

void	addOptions (PgSqlHostContextPtr &ctx, const StatementIndex &stindex, const ConstCfgOptionPtr &options_cfg, const uint64_t host_id)
	Inserts multiple options into the database. More...

void	addResv (PgSqlHostContextPtr &ctx, const IPv6Resrv &resv, const HostID &id)
	Inserts IPv6 Reservation into ipv6_reservation table. More...

uint64_t	addStatement (PgSqlHostContextPtr &ctx, PgSqlHostDataSourceImpl::StatementIndex stindex, PsqlBindArrayPtr &bind, const bool return_last_id=false)
	Executes statements which insert a row into one of the tables. More...

void	checkReadOnly (PgSqlHostContextPtr &ctx) const
	Throws exception if database is read only. More...

PgSqlHostContextPtr	createContext () const
	Create a new context. More...

bool	delStatement (PgSqlHostContextPtr &ctx, PgSqlHostDataSourceImpl::StatementIndex stindex, PsqlBindArrayPtr &bind)
	Executes statements that delete records. More...

ConstHostPtr	getHost (PgSqlHostContextPtr &ctx, const SubnetID &subnet_id, const Host::IdentifierType &identifier_type, const uint8_t *identifier_begin, const size_t identifier_len, StatementIndex stindex, boost::shared_ptr< PgSqlHostExchange > exchange) const
	Retrieves a host by subnet and client's unique identifier. More...

void	getHostCollection (PgSqlHostContextPtr &ctx, StatementIndex stindex, PsqlBindArrayPtr bind, boost::shared_ptr< PgSqlHostExchange > exchange, ConstHostCollection &result, bool single) const
	Creates collection of Host objects with associated information such as IPv6 reservations and/or DHCP options. More...

std::pair< uint32_t, uint32_t >	getVersion () const
	Returns PostgreSQL schema version of the open database. More...

Static Public Member Functions
static bool	dbReconnect (ReconnectCtlPtr db_reconnect_ctl)
	Attempts to reconnect the server to the host DB backend manager. More...

Public Attributes
bool	ip_reservations_unique_
	Holds the setting whether the IP reservations must be unique or may be non-unique. More...

DatabaseConnection::ParameterMap	parameters_
	The parameters. More...

PgSqlHostContextPoolPtr	pool_
	The pool of contexts. More...

std::string	timer_name_
	Timer name used to register database reconnect timer. More...

bool	unusable_
	Indicates if there is at least one connection that can no longer be used for normal operations. More...

Static Public Attributes
static const StatementIndex	WRITE_STMTS_BEGIN = INSERT_HOST_NON_UNIQUE_IP
	Index of first statement performing write to the database. More...

Detailed Description

Implementation of the PgSqlHostDataSource.

Definition at line 1376 of file pgsql_host_data_source.cc.

Member Enumeration Documentation

enum isc::dhcp::PgSqlHostDataSourceImpl::StatementIndex

Statement Tags.

The contents of the enum are indexes into the list of SQL statements. It is assumed that the order is such that the indices of statements reading the database are less than those of statements modifying the database.

Note: : please add new statements doing read only operations before the WRITE_STMTS_BEGIN position.

Enumerator
GET_HOST_DHCPID
GET_HOST_ADDR
GET_HOST_SUBID4_DHCPID
GET_HOST_SUBID6_DHCPID
GET_HOST_SUBID_ADDR
GET_HOST_PREFIX
GET_HOST_SUBID6_ADDR
GET_HOST_SUBID4
GET_HOST_SUBID6
GET_HOST_HOSTNAME
GET_HOST_HOSTNAME_SUBID4
GET_HOST_HOSTNAME_SUBID6
GET_HOST_SUBID4_PAGE
GET_HOST_SUBID6_PAGE
GET_HOST_PAGE4
GET_HOST_PAGE6
INSERT_HOST_NON_UNIQUE_IP
INSERT_HOST_UNIQUE_IP
INSERT_V6_RESRV_NON_UNIQUE
INSERT_V6_RESRV_UNIQUE
INSERT_V4_HOST_OPTION
INSERT_V6_HOST_OPTION
DEL_HOST_ADDR4
DEL_HOST_ADDR6
DEL_HOST_SUBID4_ID
DEL_HOST_SUBID6_ID
NUM_STATEMENTS

Definition at line 1387 of file pgsql_host_data_source.cc.

Constructor & Destructor Documentation

isc::dhcp::PgSqlHostDataSourceImpl::PgSqlHostDataSourceImpl ( const DatabaseConnection::ParameterMap & parameters )

Constructor.

This constructor opens database connection and initializes prepared statements used in the queries.

Definition at line 2221 of file pgsql_host_data_source.cc.

References createContext(), getVersion(), isc_throw, isc::db::PG_SCHEMA_VERSION_MAJOR, isc::db::PG_SCHEMA_VERSION_MINOR, pool_, and timer_name_.

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isc::dhcp::PgSqlHostDataSourceImpl::~PgSqlHostDataSourceImpl ( )

Destructor.

Definition at line 2287 of file pgsql_host_data_source.cc.

Member Function Documentation

void isc::dhcp::PgSqlHostDataSourceImpl::addOption	(	PgSqlHostContextPtr &	ctx,
		const PgSqlHostDataSourceImpl::StatementIndex &	stindex,
		const OptionDescriptor &	opt_desc,
		const std::string &	opt_space,
		const Optional< SubnetID > &	subnet_id,
		const HostID &	host_id
	)

Inserts a single DHCP option into the database.

Parameters

ctx	Context
stindex	Index of a statement being executed.
opt_desc	Option descriptor holding information about an option to be inserted into the database.
opt_space	Option space name.
subnet_id	Subnet identifier.
host_id	Host identifier.

Definition at line 2452 of file pgsql_host_data_source.cc.

References addStatement().

Referenced by addOptions().

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void isc::dhcp::PgSqlHostDataSourceImpl::addOptions	(	PgSqlHostContextPtr &	ctx,
		const StatementIndex &	stindex,
		const ConstCfgOptionPtr &	options_cfg,
		const uint64_t	host_id
	)

Inserts multiple options into the database.

Parameters

ctx	Context
stindex	Index of a statement being executed.
options_cfg	An object holding a collection of options to be inserted into the database.
host_id	Host identifier retrieved using getColumnValue in addStatement method

Definition at line 2464 of file pgsql_host_data_source.cc.

References addOption().

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void isc::dhcp::PgSqlHostDataSourceImpl::addResv	(	PgSqlHostContextPtr &	ctx,
		const IPv6Resrv &	resv,
		const HostID &	id
	)

Inserts IPv6 Reservation into ipv6_reservation table.

Parameters

ctx	Context
resv	IPv6 Reservation to be added
id	ID of a host owning this reservation

Definition at line 2440 of file pgsql_host_data_source.cc.

References addStatement(), INSERT_V6_RESRV_NON_UNIQUE, INSERT_V6_RESRV_UNIQUE, and ip_reservations_unique_.

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uint64_t isc::dhcp::PgSqlHostDataSourceImpl::addStatement	(	PgSqlHostContextPtr &	ctx,
		PgSqlHostDataSourceImpl::StatementIndex	stindex,
		PsqlBindArrayPtr &	bind,
		const bool	return_last_id = `false`
	)

Executes statements which insert a row into one of the tables.

Parameters

ctx	Context
stindex	Index of a statement being executed.
bind	Vector of PgsqlBindArray objects to be used for the query
return_last_id	flag indicating whether or not the insert returns the primary key of from the row inserted via " RETURNING <primary key> as pid" clause on the INSERT statement. The RETURNING clause causes the INSERT to return a result set that should consist of a single row with one column, the value of the primary key. Defaults to false.

Returns: 0 if return_last_id is false, otherwise it returns the the value in the result set in the first col of the first row.

Exceptions

isc::db::DuplicateEntry Database throws duplicate entry error

Definition at line 2364 of file pgsql_host_data_source.cc.

References isc::db::PgSqlConnection::DUPLICATE_KEY, isc::db::PgSqlExchange::getColumnValue(), and isc_throw.

Referenced by addOption(), and addResv().

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void isc::dhcp::PgSqlHostDataSourceImpl::checkReadOnly ( PgSqlHostContextPtr & ctx ) const

Throws exception if database is read only.

This method should be called by the methods which write to the database. If the backend is operating in read-only mode this method will throw exception.

Parameters

ctx Context

Exceptions

DbReadOnly if backend is operating in read only mode.

Definition at line 2557 of file pgsql_host_data_source.cc.

References isc_throw.

PgSqlHostContextPtr isc::dhcp::PgSqlHostDataSourceImpl::createContext ( ) const

Create a new context.

The database is opened with all the SQL commands pre-compiled.

Returns: A new (never null) context.

Exceptions

isc::dhcp::NoDatabaseName	Mandatory database name not given.
isc::db::DbOperationError	An operation on the open database has failed.

Definition at line 2250 of file pgsql_host_data_source.cc.

References dbReconnect(), isc::dhcp::dhcpsrv_logger, isc::dhcp::DHCPSRV_PGSQL_HOST_DB_READONLY, isc::dhcp::HostMgr::getIOService(), LOG_INFO, parameters_, timer_name_, and WRITE_STMTS_BEGIN.

Referenced by isc::dhcp::PgSqlHostDataSource::PgSqlHostContextAlloc::PgSqlHostContextAlloc(), and PgSqlHostDataSourceImpl().

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bool isc::dhcp::PgSqlHostDataSourceImpl::dbReconnect ( ReconnectCtlPtr db_reconnect_ctl )

static

Attempts to reconnect the server to the host DB backend manager.

This is a self-rescheduling function that attempts to reconnect to the server's host DB backends after connectivity to one or more have been lost. Upon entry it will attempt to reconnect via HostDataSourceFactory::add. If this is successful, DHCP servicing is re-enabled and server returns to normal operation.

If reconnection fails and the maximum number of retries has not been exhausted, it will schedule a call to itself to occur at the configured retry interval. DHCP service remains disabled.

If the maximum number of retries has been exhausted an error is logged and the server shuts down.

This function is passed to the connection recovery mechanism. It will be invoked when a connection loss is detected.

Parameters

db_reconnect_ctl pointer to the ReconnectCtl containing the configured reconnect parameters.

Returns: true if connection has been recovered, false otherwise.

Definition at line 2291 of file pgsql_host_data_source.cc.

References isc::dhcp::HostMgr::addBackend(), isc::dhcp::HostMgr::delBackend(), isc::dhcp::dhcpsrv_logger, isc::dhcp::DHCPSRV_PGSQL_HOST_DB_RECONNECT_ATTEMPT_FAILED, isc::dhcp::DHCPSRV_PGSQL_HOST_DB_RECONNECT_ATTEMPT_SCHEDULE, isc::dhcp::DHCPSRV_PGSQL_HOST_DB_RECONNECT_FAILED, isc::dhcp::CfgMgr::getCurrentCfg(), isc::dhcp::TimerMgr::instance(), isc::dhcp::CfgMgr::instance(), isc::db::DatabaseConnection::invokeDbFailedCallback(), isc::db::DatabaseConnection::invokeDbLostCallback(), isc::db::DatabaseConnection::invokeDbRecoveredCallback(), LOG_ERROR, LOG_INFO, isc::asiolink::IntervalTimer::ONE_SHOT, and isc::db::DatabaseConnection::parse().

Referenced by createContext().

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bool isc::dhcp::PgSqlHostDataSourceImpl::delStatement	(	PgSqlHostContextPtr &	ctx,
		PgSqlHostDataSourceImpl::StatementIndex	stindex,
		PsqlBindArrayPtr &	bind
	)

Executes statements that delete records.

Parameters

ctx	Context
stindex	Index of a statement being executed.
bind	pointer to PsqlBindArray objects to be used for the query

Returns: true if any records were deleted, false otherwise

Definition at line 2412 of file pgsql_host_data_source.cc.

References isc_throw.

ConstHostPtr isc::dhcp::PgSqlHostDataSourceImpl::getHost	(	PgSqlHostContextPtr &	ctx,
		const SubnetID &	subnet_id,
		const Host::IdentifierType &	identifier_type,
		const uint8_t *	identifier_begin,
		const size_t	identifier_len,
		StatementIndex	stindex,
		boost::shared_ptr< PgSqlHostExchange >	exchange
	)		const

Retrieves a host by subnet and client's unique identifier.

This method is used by both PgSqlHostDataSource::get4 and PgSqlHostDataSource::get6 methods.

Parameters

ctx	Context
subnet_id	Subnet identifier.
identifier_type	Identifier type.
identifier_begin	Pointer to a beginning of a buffer containing an identifier.
identifier_len	Identifier length.
stindex	Statement index.
exchange	Pointer to the exchange object used for the particular query.

Returns: Pointer to const instance of Host or null pointer if no host found.

Definition at line 2517 of file pgsql_host_data_source.cc.

References getHostCollection().

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void isc::dhcp::PgSqlHostDataSourceImpl::getHostCollection	(	PgSqlHostContextPtr &	ctx,
		StatementIndex	stindex,
		PsqlBindArrayPtr	bind,
		boost::shared_ptr< PgSqlHostExchange >	exchange,
		ConstHostCollection &	result,
		bool	single
	)		const

Creates collection of Host objects with associated information such as IPv6 reservations and/or DHCP options.

This method performs a query which returns host information from the 'hosts' table. The query may also use LEFT JOIN clause to retrieve information from other tables, e.g. ipv6_reservations, dhcp4_options and dhcp6_options. Whether IPv6 reservations and/or options are assigned to the Host objects depends on the type of the exchange object.

Parameters

	ctx	Context
	stindex	Statement index.
	bind	Pointer to an array of PgSQL bindings.
	exchange	Pointer to the exchange object used for the particular query.
[out]	result	Reference to the collection of hosts returned.
	single	A boolean value indicating if a single host is expected to be returned, or multiple hosts.

Definition at line 2488 of file pgsql_host_data_source.cc.

References isc::db::PgSqlResult::getRows(), and isc_throw.

Referenced by getHost().

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std::pair< uint32_t, uint32_t > isc::dhcp::PgSqlHostDataSourceImpl::getVersion ( ) const

Returns PostgreSQL schema version of the open database.

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

Exceptions

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

Definition at line 2550 of file pgsql_host_data_source.cc.

References isc::dhcp::DHCPSRV_DBG_TRACE_DETAIL, isc::dhcp::dhcpsrv_logger, isc::dhcp::DHCPSRV_PGSQL_HOST_DB_GET_VERSION, isc::db::PgSqlConnection::getVersion(), LOG_DEBUG, and parameters_.

Referenced by PgSqlHostDataSourceImpl().

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Member Data Documentation

bool isc::dhcp::PgSqlHostDataSourceImpl::ip_reservations_unique_

Holds the setting whether the IP reservations must be unique or may be non-unique.

Definition at line 1614 of file pgsql_host_data_source.cc.

Referenced by addResv().

DatabaseConnection::ParameterMap isc::dhcp::PgSqlHostDataSourceImpl::parameters_

The parameters.

Definition at line 1610 of file pgsql_host_data_source.cc.

Referenced by createContext(), and getVersion().

PgSqlHostContextPoolPtr isc::dhcp::PgSqlHostDataSourceImpl::pool_

The pool of contexts.

Definition at line 1617 of file pgsql_host_data_source.cc.

Referenced by isc::dhcp::PgSqlHostDataSource::PgSqlHostContextAlloc::PgSqlHostContextAlloc(), and PgSqlHostDataSourceImpl().

std::string isc::dhcp::PgSqlHostDataSourceImpl::timer_name_

Timer name used to register database reconnect timer.

Definition at line 1624 of file pgsql_host_data_source.cc.

Referenced by createContext(), and PgSqlHostDataSourceImpl().

bool isc::dhcp::PgSqlHostDataSourceImpl::unusable_

Indicates if there is at least one connection that can no longer be used for normal operations.

Definition at line 1621 of file pgsql_host_data_source.cc.

const StatementIndex isc::dhcp::PgSqlHostDataSourceImpl::WRITE_STMTS_BEGIN = INSERT_HOST_NON_UNIQUE_IP

static

Index of first statement performing write to the database.

This value is used to mark border line between queries and other statements and statements performing write operation on the database, such as INSERT, DELETE, UPDATE.

Definition at line 1422 of file pgsql_host_data_source.cc.

Referenced by createContext().

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

pgsql_host_data_source.cc

Public Types
enum	StatementIndex { GET_HOST_DHCPID, GET_HOST_ADDR, GET_HOST_SUBID4_DHCPID, GET_HOST_SUBID6_DHCPID, GET_HOST_SUBID_ADDR, GET_HOST_PREFIX, GET_HOST_SUBID6_ADDR, GET_HOST_SUBID4, GET_HOST_SUBID6, GET_HOST_HOSTNAME, GET_HOST_HOSTNAME_SUBID4, GET_HOST_HOSTNAME_SUBID6, GET_HOST_SUBID4_PAGE, GET_HOST_SUBID6_PAGE, GET_HOST_PAGE4, GET_HOST_PAGE6, INSERT_HOST_NON_UNIQUE_IP, INSERT_HOST_UNIQUE_IP, INSERT_V6_RESRV_NON_UNIQUE, INSERT_V6_RESRV_UNIQUE, INSERT_V4_HOST_OPTION, INSERT_V6_HOST_OPTION, DEL_HOST_ADDR4, DEL_HOST_ADDR6, DEL_HOST_SUBID4_ID, DEL_HOST_SUBID6_ID, NUM_STATEMENTS }
	Statement Tags. More...

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes

Static Public Attributes

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation