Provides methods to access CSV file with DHCPv4 leases. More...

#include <csv_lease_file4.h>

Inheritance diagram for isc::dhcp::CSVLeaseFile4:

Public Member Functions
	CSVLeaseFile4 (const std::string &filename)
	Constructor.

void	append (const Lease4 &lease)
	Appends the lease record to the CSV file.

bool	next (Lease4Ptr &lease)
	Reads next lease from the CSV file.

virtual void	open (const bool seek_to_end=false)
	Opens a lease file.

Public Member Functions inherited from isc::util::VersionedCSVFile
	VersionedCSVFile (const std::string &filename)
	Constructor.

virtual	~VersionedCSVFile ()
	Destructor.

void	addColumn (const std::string &col_name, const std::string &version, const std::string &default_value="")
	Adds metadata for a single column to the schema.

size_t	getInputHeaderCount () const
	Returns the number of columns found in the input header.

enum InputSchemaState	getInputSchemaState () const
	Fetches the state of the input file's schema.

std::string	getInputSchemaVersion () const
	Returns the schema version of the physical file.

size_t	getMinimumValidColumns () const
	Returns the minimum number of columns which must be present for the file to be considered valid.

std::string	getSchemaVersion () const
	text version of current schema supported by the file's metadata

size_t	getValidColumnCount () const
	Returns the number of valid columns found in the header For newly created files this will always match the number of defined columns (i.e.

const VersionedColumnPtr &	getVersionedColumn (const size_t index) const
	Fetch the column descriptor for a given index.

bool	needsConversion () const
	Returns true if the input file schema state is not CURRENT.

bool	next (CSVRow &row)
	Reads next row from the file file.

virtual void	recreate ()
	Creates a new CSV file.

void	setMinimumValidColumns (const std::string &column_name)
	Sets the minimum number of valid columns based on a given column.

Public Member Functions inherited from isc::util::CSVFile
	CSVFile (const std::string &filename)
	Constructor.

virtual	~CSVFile ()
	Destructor.

void	addColumn (const std::string &col_name)
	Adds new column name.

void	append (const CSVRow &row) const
	Writes the CSV row into the file.

void	close ()
	Closes the CSV file.

bool	exists () const
	Checks if the CSV file exists and can be opened for reading.

void	flush () const
	Flushes a file.

size_t	getColumnCount () const
	Returns the number of columns in the file.

size_t	getColumnIndex (const std::string &col_name) const
	Returns the index of the column having specified name.

std::string	getColumnName (const size_t col_index) const
	Returns the name of the column.

std::string	getFilename () const
	Returns the path to the CSV file.

std::string	getReadMsg () const
	Returns the description of the last error returned by the `CSVFile::next` function.

bool	next (CSVRow &row, const bool skip_validation=false)
	Reads next row from CSV file.

void	setReadMsg (const std::string &read_msg)
	Sets error message after row validation.

Public Member Functions inherited from isc::dhcp::LeaseFileStats
	LeaseFileStats ()
	Constructor.

	~LeaseFileStats ()
	Destructor.

void	clearStatistics ()
	Clears the statistics.

uint32_t	getReadErrs () const
	Gets the number of errors when reading leases.

uint32_t	getReadLeases () const
	Gets the number of leases read.

uint32_t	getReads () const
	Gets the number of attempts to read a lease.

uint32_t	getWriteErrs () const
	Gets the number of errors when writing leases.

uint32_t	getWriteLeases () const
	Gets the number of leases written.

uint32_t	getWrites () const
	Gets the number of attempts to write a lease.

Additional Inherited Members
Public Types inherited from isc::util::VersionedCSVFile
enum	InputSchemaState { CURRENT , NEEDS_UPGRADE , NEEDS_DOWNGRADE }
	Possible input file schema states. More...

Static Public Member Functions inherited from isc::util::CSVFile
static CSVRow	EMPTY_ROW ()
	Represents empty row.

Protected Member Functions inherited from isc::util::VersionedCSVFile
void	columnCountError (const CSVRow &row, const std::string &reason)
	Convenience method for adding an error message.

virtual bool	validateHeader (const CSVRow &header)
	Validates the header of a VersionedCSVFile.

Protected Member Functions inherited from isc::util::CSVFile
void	addColumnInternal (const std::string &col_name)
	Adds a column regardless if the file is open or not.

virtual bool	validate (const CSVRow &row)
	Validate the row read from a file.

Protected Attributes inherited from isc::dhcp::LeaseFileStats
uint32_t	read_errs_
	Number of errors when reading.

uint32_t	read_leases_
	Number of leases read.

uint32_t	reads_
	Number of attempts to read a lease.

uint32_t	write_errs_
	Number of errors when writing.

uint32_t	write_leases_
	Number of lease written.

uint32_t	writes_
	Number of attempts to write a lease.

Detailed Description

Provides methods to access CSV file with DHCPv4 leases.

This class contains methods customized to read and write DHCPv4 leases from and to the CSV file. It expects that the CSV file being parsed contains a set of columns with well known names (initialized in the class constructor).

Todo: This class doesn't validate the lease values read from the file. The Lease4 is a structure that should be itself responsible for this validation. However, the next function may need to be updated to use the validation capability of Lease4.

Definition at line 33 of file csv_lease_file4.h.

Constructor & Destructor Documentation

◆ CSVLeaseFile4()

isc::dhcp::CSVLeaseFile4::CSVLeaseFile4 ( const std::string & filename )

Constructor.

Initializes columns of the lease file.

Parameters

filename Name of the lease file.

Definition at line 18 of file csv_lease_file4.cc.

Member Function Documentation

◆ append()

void isc::dhcp::CSVLeaseFile4::append ( const Lease4 & lease )

Appends the lease record to the CSV file.

This function doesn't throw exceptions itself. In theory, exceptions are possible when the index of the indexes of the values being written to the file are invalid. However, this would have been a programming error.

Parameters

lease Structure representing a DHCPv4 lease.

Exceptions

BadValue if the lease has no hardware address, no client id and is not in STATE_DECLINED.

Definition at line 33 of file csv_lease_file4.cc.

References isc::dhcp::Lease::basicStatesToText(), isc::util::CSVFile::getColumnCount(), isc::util::CSVFile::getColumnIndex(), isc_throw, isc::dhcp::Lease::STATE_DECLINED, isc::dhcp::LeaseFileStats::write_errs_, isc::dhcp::LeaseFileStats::write_leases_, and isc::dhcp::LeaseFileStats::writes_.

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◆ next()

bool isc::dhcp::CSVLeaseFile4::next ( Lease4Ptr & lease )

Reads next lease from the CSV file.

If this function hits an error during lease read, it sets the error message using CSVFile::setReadMsg and returns false. The error string may be read using CSVFile::getReadMsg.

Treats rows without a hardware address or a client id when their state is not STATE_DECLINED as an error.

This function is exception safe.

Parameters

[out] lease Pointer to the lease read from CSV file or NULL pointer if lease hasn't been read.

Returns: Boolean value indicating that the new lease has been read from the CSV file (if true), or that the error has occurred (false).

Todo: Make sure that the values read from the file are correct. The appropriate Lease4 validation mechanism should be used.

Definition at line 87 of file csv_lease_file4.cc.

References isc::dhcp::Lease::basicStatesToText(), isc::util::CSVFile::EMPTY_ROW(), isc::dhcp::HWAddr::hwaddr_, isc_throw, isc::util::VersionedCSVFile::next(), isc::dhcp::LeaseFileStats::read_errs_, isc::dhcp::LeaseFileStats::read_leases_, isc::dhcp::LeaseFileStats::reads_, isc::util::CSVFile::setReadMsg(), isc::dhcp::Lease::STATE_DECLINED, and isc::asiolink::IOAddress::toText().

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◆ open()

void isc::dhcp::CSVLeaseFile4::open ( const bool seek_to_end = false )

virtual

Opens a lease file.

This function calls the base class open to do the work of opening a file. It is used to clear any statistics associated with any previous use of the file While it doesn't throw any exceptions of its own the base class may do so.

Reimplemented from isc::util::VersionedCSVFile.

Definition at line 24 of file csv_lease_file4.cc.

References isc::dhcp::LeaseFileStats::clearStatistics(), and isc::util::VersionedCSVFile::open().

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

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ CSVLeaseFile4()

Member Function Documentation

◆ append()

◆ next()

◆ open()