Common PgSql Connector Pool. More...

#include <pgsql_connection.h>

Inheritance diagram for isc::db::PgSqlConnection:

Public Types
typedef std::function< void(PgSqlResult &, int)>	ConsumeResultRowFun
	Function invoked to process fetched row. More...

Public Types inherited from isc::db::DatabaseConnection
typedef std::map< std::string, std::string >	ParameterMap
	Database configuration parameter map. More...

Public Member Functions
	PgSqlConnection (const ParameterMap &parameters, IOServiceAccessorPtr io_accessor=IOServiceAccessorPtr(), DbCallback callback=DbCallback())
	Constructor. More...

virtual	~PgSqlConnection ()
	Destructor. More...

void	checkStatementError (const PgSqlResult &r, PgSqlTaggedStatement &statement)
	Checks result of the r object. More...

void	commit ()
	Commits current transaction. More...

bool	compareError (const PgSqlResult &r, const char *error_state)
	Checks a result set's SQL state against an error state. More...

void	createSavepoint (const std::string &name)
	Creates a savepoint within the current transaction. More...

PgSqlResultPtr	executePreparedStatement (PgSqlTaggedStatement &statement, const PsqlBindArray &in_bindings=PsqlBindArray())
	Executes a prepared SQL statement. More...

void	executeSQL (const std::string &sql)
	Executes the an SQL statement. More...

std::string	getConnParameters ()
	Creates connection string from specified parameters. More...

void	insertQuery (PgSqlTaggedStatement &statement, const PsqlBindArray &in_bindings)
	Executes INSERT prepared statement. More...

bool	isTransactionStarted () const
	Checks if there is a transaction in progress. More...

void	openDatabase ()
	Open database with logging. More...

	operator bool () const
	Boolean Operator. More...

	operator PGconn * () const
	Conversion Operator. More...

void	prepareStatement (const PgSqlTaggedStatement &statement)
	Prepare Single Statement. More...

void	prepareStatements (const PgSqlTaggedStatement start_statement, const PgSqlTaggedStatement end_statement)
	Prepare statements. More...

void	rollback ()
	Rollbacks current transaction. More...

void	rollbackToSavepoint (const std::string &name)
	Rollbacks to the given savepoint. More...

void	selectQuery (PgSqlTaggedStatement &statement, const PsqlBindArray &in_bindings, ConsumeResultRowFun process_result_row)
	Executes SELECT query using prepared statement. More...

void	startRecoverDbConnection ()
	The recover connection. More...

void	startTransaction ()
	Starts new transaction. More...

uint64_t	updateDeleteQuery (PgSqlTaggedStatement &statement, const PsqlBindArray &in_bindings)
	Executes UPDATE or DELETE prepared statement and returns the number of affected rows. More...

Public Member Functions inherited from isc::db::DatabaseConnection
	DatabaseConnection (const ParameterMap &parameters, DbCallback callback=DbCallback())
	Constructor. More...

virtual	~DatabaseConnection ()
	Destructor. More...

void	checkUnusable ()
	Throws an exception if the connection is not usable. More...

bool	configuredReadOnly () const
	Convenience method checking if database should be opened with read only access. More...

std::string	getParameter (const std::string &name) const
	Returns value of a connection parameter. More...

bool	isUnusable ()
	Flag which indicates if connection is unusable. More...

virtual void	makeReconnectCtl (const std::string &timer_name)
	Instantiates a ReconnectCtl based on the connection's reconnect parameters. More...

util::ReconnectCtlPtr	reconnectCtl ()
	The reconnect settings. More...

Static Public Member Functions
static std::pair< uint32_t, uint32_t >	getVersion (const ParameterMap &parameters)
	Get the schema version. More...

Static Public Member Functions inherited from isc::db::DatabaseConnection
static bool	invokeDbFailedCallback (const util::ReconnectCtlPtr &db_reconnect_ctl)
	Invokes the connection's restore failed connectivity callback. More...

static bool	invokeDbLostCallback (const util::ReconnectCtlPtr &db_reconnect_ctl)
	Invokes the connection's lost connectivity callback. More...

static bool	invokeDbRecoveredCallback (const util::ReconnectCtlPtr &db_reconnect_ctl)
	Invokes the connection's restored connectivity callback. More...

static ParameterMap	parse (const std::string &dbaccess)
	Parse database access string. More...

static std::string	redactedAccessString (const ParameterMap &parameters)
	Redact database access string. More...

static isc::data::ElementPtr	toElement (const ParameterMap &params)
	Unparse a parameter map. More...

static isc::data::ElementPtr	toElementDbAccessString (const std::string &dbaccess)
	Unparse an access string. More...

Public Attributes
PgSqlHolder	conn_
	PgSql connection handle. More...

isc::asiolink::IOServicePtr	io_service_
	IOService object, used for all ASIO operations. More...

IOServiceAccessorPtr	io_service_accessor_
	Accessor function which returns the IOService that can be used to recover the connection. More...

int	transaction_ref_count_
	Reference counter for transactions. More...

Static Public Attributes
static const char	DUPLICATE_KEY [] = ERRCODE_UNIQUE_VIOLATION
	Define the PgSql error state for a duplicate key error. More...

static const char	NULL_KEY [] = ERRCODE_NOT_NULL_VIOLATION
	Define the PgSql error state for a null foreign key error. More...

static bool	warned_about_tls = false
	Emit the TLS support warning only once. More...

Static Public Attributes inherited from isc::db::DatabaseConnection
static DbCallback	db_failed_callback_ = 0
	Optional callback function to invoke if an opened connection recovery failed. More...

static DbCallback	db_lost_callback_ = 0
	Optional callback function to invoke if an opened connection is lost. More...

static DbCallback	db_recovered_callback_ = 0
	Optional callback function to invoke if an opened connection recovery succeeded. More...

static const time_t	MAX_DB_TIME = 2147483647
	Defines maximum value for time that can be reliably stored. More...

Additional Inherited Members
Protected Member Functions inherited from isc::db::DatabaseConnection
void	markUnusable ()
	Sets the unusable flag to true. More...

Protected Attributes inherited from isc::db::DatabaseConnection
DbCallback	callback_
	The callback used to recover the connection. More...

Detailed Description

Common PgSql Connector Pool.

This class provides common operations for PgSql database connection used by both PgSqlLeaseMgr and PgSqlHostDataSource. It manages connecting to the database and preparing compiled statements. Its fields are public, because they are used (both set and retrieved) in classes that use instances of PgSqlConnection.

Definition at line 198 of file pgsql_connection.h.

Member Typedef Documentation

◆ ConsumeResultRowFun

typedef std::function<void(PgSqlResult&, int)> isc::db::PgSqlConnection::ConsumeResultRowFun

Function invoked to process fetched row.

Definition at line 206 of file pgsql_connection.h.

Constructor & Destructor Documentation

◆ PgSqlConnection()

isc::db::PgSqlConnection::PgSqlConnection	(	const ParameterMap &	parameters,
		IOServiceAccessorPtr	io_accessor = `IOServiceAccessorPtr()`,
		DbCallback	callback = `DbCallback()`
	)

inline

Constructor.

Initialize PgSqlConnection object with parameters needed for connection.

Parameters

parameters	Specify the connection details.
io_accessor	The IOService accessor function.
callback	The connection recovery callback.

Definition at line 218 of file pgsql_connection.h.

◆ ~PgSqlConnection()

isc::db::PgSqlConnection::~PgSqlConnection ( )

virtual

Destructor.

Definition at line 122 of file pgsql_connection.cc.

References isc::db::DB_LOG< log_type >::arg(), conn_, and isc::db::PGSQL_DEALLOC_ERROR.

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Member Function Documentation

◆ checkStatementError()

void isc::db::PgSqlConnection::checkStatementError	(	const PgSqlResult &	r,
		PgSqlTaggedStatement &	statement
	)

Checks result of the r object.

This function is used to determine whether or not the SQL statement execution succeeded, and in the event of failures, decide whether or not the failures are recoverable.

If the error is recoverable, the function will throw a DbOperationError. If the error is deemed unrecoverable, such as a loss of connectivity with the server, the function will call startRecoverDbConnection() which will start the connection recovery.

If the invocation returns true, this indicates the calling layer will attempt recovery, and the function throws a DbOperationError to allow the caller to error handle the failed db access attempt.

Parameters

r	result of the last PostgreSQL operation
statement	- tagged statement that was executed

Exceptions

isc::db::DbOperationError Detailed PostgreSQL failure

Definition at line 313 of file pgsql_connection.cc.

References isc::db::DB_LOG< log_type >::arg(), compareError(), conn_, DUPLICATE_KEY, isc_throw, isc::db::DatabaseConnection::markUnusable(), isc::db::PgSqlTaggedStatement::name, NULL_KEY, isc::db::PGSQL_FATAL_ERROR, and startRecoverDbConnection().

Referenced by executePreparedStatement(), and executeSQL().

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◆ commit()

void isc::db::PgSqlConnection::commit ( )

Commits current transaction.

Commits all pending database operations. On databases that don't support transactions, this is a no-op.

When this method is called for a nested transaction it decrements the transaction reference counter incremented during the call to startTransaction.

Exceptions

DbOperationError If the commit failed.

Definition at line 389 of file pgsql_connection.cc.

References isc::db::DatabaseConnection::checkUnusable(), conn_, isc::db::DB_DBG_TRACE_DETAIL, isc_throw, isc::db::PGSQL_COMMIT, and transaction_ref_count_.

Referenced by isc::db::PgSqlTransaction::commit().

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◆ compareError()

bool isc::db::PgSqlConnection::compareError	(	const PgSqlResult &	r,
		const char *	error_state
	)

Checks a result set's SQL state against an error state.

Parameters

r	result set to check
error_state	error state to compare against

Returns: True if the result set's SQL state equals the error_state, false otherwise.

Definition at line 305 of file pgsql_connection.cc.

References PGSQL_STATECODE_LEN.

Referenced by checkStatementError().

◆ createSavepoint()

void isc::db::PgSqlConnection::createSavepoint ( const std::string & name )

Creates a savepoint within the current transaction.

Creates a named savepoint within the current transaction.

Parameters

name	name of the savepoint to create.

Exceptions

InvalidOperation	if called outside a transaction.
DbOperationError	If the savepoint cannot be created.

Definition at line 429 of file pgsql_connection.cc.

References isc::db::DB_LOG< log_type >::arg(), isc::db::DB_DBG_TRACE_DETAIL, executeSQL(), isc_throw, isc::db::PGSQL_CREATE_SAVEPOINT, and transaction_ref_count_.

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◆ executePreparedStatement()

PgSqlResultPtr isc::db::PgSqlConnection::executePreparedStatement	(	PgSqlTaggedStatement &	statement,
		const PsqlBindArray &	in_bindings = `PsqlBindArray()`
	)

Executes a prepared SQL statement.

It executes the given prepared SQL statement, after checking for usability and input parameter sanity. After the statement is executed checkStatementError() is invoked to ensure we detect connectivity issues properly. Upon successful execution, the the result set is returned. It may be used for any form of prepared SQL statement (e.g query, insert, update, delete...), with or without input parameters.

Parameters

statement	PgSqlTaggedStatement describing the prepared statement to execute.
in_bindings	array of input parameter bindings. If the SQL statement requires no input arguments, this parameter should either be omitted or an empty PsqlBindArray should be supplied.

Exceptions

InvalidOperation if the number of parameters expected by the statement does not match the size of the input bind array.

Definition at line 460 of file pgsql_connection.cc.

References checkStatementError(), isc::db::DatabaseConnection::checkUnusable(), conn_, isc::db::PsqlBindArray::formats_, isc_throw, isc::db::PsqlBindArray::lengths_, isc::db::PgSqlTaggedStatement::name, isc::db::PgSqlTaggedStatement::nbparams, isc::db::PsqlBindArray::size(), isc::db::PgSqlTaggedStatement::text, and isc::db::PsqlBindArray::values_.

Referenced by insertQuery(), selectQuery(), and updateDeleteQuery().

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◆ executeSQL()

void isc::db::PgSqlConnection::executeSQL ( const std::string & sql )

Executes the an SQL statement.

It executes the given SQL text after first checking the connection for usability. After the statement is executed checkStatementError() is invoked to ensure we detect connectivity issues properly. It is intended to be used to execute utility statements such as commit, rollback et al, which have no parameters, return no results, and are not pre-compiled.

Parameters

sql	SQL statement to execute.

Definition at line 450 of file pgsql_connection.cc.

References checkStatementError(), isc::db::DatabaseConnection::checkUnusable(), conn_, and isc::db::OID_NONE.

Referenced by createSavepoint(), and rollbackToSavepoint().

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◆ getConnParameters()

std::string isc::db::PgSqlConnection::getConnParameters ( )

Creates connection string from specified parameters.

This function is called from the unit tests.

Returns: connection string for openDatabase.

Exceptions

NoDatabaseName	Mandatory database name not given
DbInvalidTimeout	when the database timeout is wrong.

Definition at line 184 of file pgsql_connection.cc.

◆ getVersion()

std::pair< uint32_t, uint32_t > isc::db::PgSqlConnection::getVersion ( const ParameterMap & parameters )

static

Get the schema version.

Parameters

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

Returns: Version number 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 137 of file pgsql_connection.cc.

References conn_, isc::db::PgSqlExchange::getColumnValue(), isc_throw, and version().

Referenced by isc::dhcp::PgSqlHostDataSourceImpl::getVersion(), and isc::dhcp::PgSqlLeaseMgr::getVersion().

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◆ insertQuery()

void isc::db::PgSqlConnection::insertQuery	(	PgSqlTaggedStatement &	statement,
		const PsqlBindArray &	in_bindings
	)

Executes INSERT prepared statement.

The statement must refer to an existing prepared statement associated with the connection. The in_bindings size must match the number of placeholders in the prepared statement.

This method executes prepared statement using provided bindings to insert data into the database.

Parameters

statement	reference to the precompiled tagged statement to execute
in_bindings	input bindings holding values to substitue placeholders in the query.

Definition at line 511 of file pgsql_connection.cc.

References executePreparedStatement().

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◆ isTransactionStarted()

bool isc::db::PgSqlConnection::isTransactionStarted ( ) const

Checks if there is a transaction in progress.

Returns: true if a transaction has been started, false otherwise.

Definition at line 384 of file pgsql_connection.cc.

References transaction_ref_count_.

◆ openDatabase()

void isc::db::PgSqlConnection::openDatabase ( )

Open database with logging.

Opens the database using the information supplied in the parameters passed to the constructor. It logs warnings resulting from the getConnParameters.

Exceptions

NoDatabaseName	Mandatory database name not given
DbOpenError	Error opening the database

Definition at line 278 of file pgsql_connection.cc.

◆ operator bool()

isc::db::PgSqlConnection::operator bool ( ) const

inline

Boolean Operator.

Allows testing the PgConnection for initialized connection

Definition at line 545 of file pgsql_connection.h.

References conn_.

◆ operator PGconn *()

isc::db::PgSqlConnection::operator PGconn * ( ) const

inline

Conversion Operator.

Allows the PgConnection object to be passed as the context argument to PQxxxx functions.

Definition at line 538 of file pgsql_connection.h.

References conn_.

◆ prepareStatement()

void isc::db::PgSqlConnection::prepareStatement ( const PgSqlTaggedStatement & statement )

Prepare Single Statement.

Creates a prepared statement from the text given and adds it to the statements_ vector at the given index.

Parameters

statement SQL statement to be prepared.

Exceptions

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

Definition at line 161 of file pgsql_connection.cc.

References conn_, isc_throw, isc::db::PgSqlTaggedStatement::name, isc::db::PgSqlTaggedStatement::nbparams, isc::db::PgSqlTaggedStatement::text, and isc::db::PgSqlTaggedStatement::types.

Referenced by prepareStatements().

◆ prepareStatements()

void isc::db::PgSqlConnection::prepareStatements	(	const PgSqlTaggedStatement *	start_statement,
		const PgSqlTaggedStatement *	end_statement
	)

Prepare statements.

Creates the prepared statements for all of the SQL statements used by the PostgreSQL backend.

Parameters

start_statement	Pointer to the first statement in range of the statements to be compiled.
end_statement	Pointer to the statement marking end of the range of statements to be compiled. This last statement is not compiled.

Exceptions

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

Definition at line 174 of file pgsql_connection.cc.

References prepareStatement().

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◆ rollback()

void isc::db::PgSqlConnection::rollback ( )

Rollbacks current transaction.

Rolls back all pending database operations. On databases that don't support transactions, this is a no-op.

When this method is called for a nested transaction it decrements the transaction reference counter incremented during the call to startTransaction.

Exceptions

DbOperationError If the rollback failed.

Definition at line 409 of file pgsql_connection.cc.

References isc::db::DatabaseConnection::checkUnusable(), conn_, isc::db::DB_DBG_TRACE_DETAIL, isc_throw, isc::db::PGSQL_ROLLBACK, and transaction_ref_count_.

Referenced by isc::db::PgSqlTransaction::~PgSqlTransaction().

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◆ rollbackToSavepoint()

void isc::db::PgSqlConnection::rollbackToSavepoint ( const std::string & name )

Rollbacks to the given savepoint.

Rolls back all pending database operations made after the named savepoint.

Parameters

name	name of the savepoint to which to rollback.

Exceptions

InvalidOperation	if called outside a transaction.
DbOperationError	if the rollback failed.

Definition at line 440 of file pgsql_connection.cc.

References executeSQL(), isc_throw, and transaction_ref_count_.

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◆ selectQuery()

void isc::db::PgSqlConnection::selectQuery	(	PgSqlTaggedStatement &	statement,
		const PsqlBindArray &	in_bindings,
		ConsumeResultRowFun	process_result_row
	)

Executes SELECT query using prepared statement.

The statement parameter refers to an existing prepared statement associated with the connection. The in_bindings size must match the number of placeholders in the prepared statement.

This method executes prepared statement using provided input bindings and calls process_result_row function for each returned row. The process_result_row function is implemented by the caller and should gather and store each returned row in an external data structure prior.

Parameters

statement	reference to the precompiled tagged statement to execute
in_bindings	input bindings holding values to substitue placeholders in the query.
process_result_row	Pointer to the function to be invoked for each retrieved row. This function consumes the retrieved data from the result set.

Definition at line 490 of file pgsql_connection.cc.

References executePreparedStatement(), isc_throw, isc::db::PgSqlTaggedStatement::text, and isc::Exception::what().

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◆ startRecoverDbConnection()

void isc::db::PgSqlConnection::startRecoverDbConnection ( )

inline

The recover connection.

This function starts the recover process of the connection.

Note: The recover function must be run on the IO Service thread.

Definition at line 442 of file pgsql_connection.h.

References isc::db::DatabaseConnection::callback_, io_service_, io_service_accessor_, and isc::db::DatabaseConnection::reconnectCtl().

Referenced by checkStatementError().

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◆ startTransaction()

void isc::db::PgSqlConnection::startTransaction ( )

Starts new transaction.

This function begins a new transaction by sending the START TRANSACTION statement to the database. The transaction should be explicitly committed by calling commit() or rolled back by calling rollback().

PostgreSQL does not support nested transactions directly. Issuing a START TRANSACTION while already in a transaction will cause a warning to be emitted but otherwise does not alter the state of the current transaction. In other words, the transaction will still end upon the next COMMIT or ROLLBACK statement.

Therefore, this function checks if a transaction has already started and does not start a new transaction. However, it increments a transaction reference counter which is later decremented when commit() or rollback() is called. When this mechanism is used properly, it guarantees that nested transactions are not attempted, thus avoiding unexpected commits or rollbacks of the pending transaction.

Definition at line 367 of file pgsql_connection.cc.

References isc::db::DatabaseConnection::checkUnusable(), conn_, isc::db::DB_DBG_TRACE_DETAIL, isc_throw, isc::db::PGSQL_START_TRANSACTION, and transaction_ref_count_.

Referenced by isc::db::PgSqlTransaction::PgSqlTransaction().

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◆ updateDeleteQuery()

uint64_t isc::db::PgSqlConnection::updateDeleteQuery	(	PgSqlTaggedStatement &	statement,
		const PsqlBindArray &	in_bindings
	)

Executes UPDATE or DELETE prepared statement and returns the number of affected rows.

The statement must refer to an existing prepared statement associated with the connection. The in_bindings size must match the number of placeholders in the prepared statement.

Parameters

statement	reference to the precompiled tagged statement to execute
in_bindings	Input bindings holding values to substitute placeholders in the query.

Returns: Number of affected rows.

Definition at line 518 of file pgsql_connection.cc.

References executePreparedStatement().

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Member Data Documentation

◆ conn_

PgSqlHolder isc::db::PgSqlConnection::conn_

PgSql connection handle.

This field is public, because it is used heavily from PgSqlLeaseMgr and from PgSqlHostDataSource.

Definition at line 532 of file pgsql_connection.h.

Referenced by ~PgSqlConnection(), checkStatementError(), commit(), executePreparedStatement(), executeSQL(), getVersion(), operator bool(), operator PGconn *(), prepareStatement(), rollback(), and startTransaction().

◆ DUPLICATE_KEY

const char isc::db::PgSqlConnection::DUPLICATE_KEY = ERRCODE_UNIQUE_VIOLATION

static

Define the PgSql error state for a duplicate key error.

Definition at line 201 of file pgsql_connection.h.

Referenced by isc::dhcp::PgSqlHostDataSourceImpl::addStatement(), and checkStatementError().

◆ io_service_

isc::asiolink::IOServicePtr isc::db::PgSqlConnection::io_service_

IOService object, used for all ASIO operations.

Definition at line 580 of file pgsql_connection.h.

Referenced by startRecoverDbConnection().

◆ io_service_accessor_

IOServiceAccessorPtr isc::db::PgSqlConnection::io_service_accessor_

Accessor function which returns the IOService that can be used to recover the connection.

This accessor is used to lazy retrieve the IOService when the connection is lost. It is useful to retrieve it at a later time to support hook libraries which create managers on load and set IOService later on by using the dhcp4_srv_configured and dhcp6_srv_configured hooks.

Definition at line 577 of file pgsql_connection.h.

Referenced by startRecoverDbConnection().

◆ NULL_KEY

const char isc::db::PgSqlConnection::NULL_KEY = ERRCODE_NOT_NULL_VIOLATION

static

Define the PgSql error state for a null foreign key error.

Definition at line 203 of file pgsql_connection.h.

Referenced by checkStatementError().

◆ transaction_ref_count_

int isc::db::PgSqlConnection::transaction_ref_count_

Reference counter for transactions.

It precludes starting and committing nested transactions. PostgreSQL logs but ignores START TRANSACTIONs (or BEGINs) issued from within an ongoing transaction. We do not want to start new transactions when one is already in progress.

Definition at line 588 of file pgsql_connection.h.

Referenced by commit(), createSavepoint(), isTransactionStarted(), rollback(), rollbackToSavepoint(), and startTransaction().

◆ warned_about_tls

bool isc::db::PgSqlConnection::warned_about_tls = false

static

Emit the TLS support warning only once.

Definition at line 209 of file pgsql_connection.h.

Referenced by isc::dhcp::PgSqlHostDataSourceImpl::PgSqlHostDataSourceImpl(), and isc::dhcp::PgSqlLeaseMgr::PgSqlLeaseMgr().

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

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes

Static Public Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ ConsumeResultRowFun

Constructor & Destructor Documentation

◆ PgSqlConnection()

◆ ~PgSqlConnection()

Member Function Documentation

◆ checkStatementError()

◆ commit()

◆ compareError()

◆ createSavepoint()

◆ executePreparedStatement()

◆ executeSQL()

◆ getConnParameters()

◆ getVersion()

◆ insertQuery()

◆ isTransactionStarted()

◆ openDatabase()

◆ operator bool()

◆ operator PGconn *()

◆ prepareStatement()

◆ prepareStatements()

◆ rollback()

◆ rollbackToSavepoint()

◆ selectQuery()

◆ startRecoverDbConnection()

◆ startTransaction()

◆ updateDeleteQuery()

Member Data Documentation

◆ conn_

◆ DUPLICATE_KEY

◆ io_service_

◆ io_service_accessor_

◆ NULL_KEY

◆ transaction_ref_count_

◆ warned_about_tls