#include <protocol_callback.h>

Inheritance diagram for Protocol_callback:

Public Member Functions
	Protocol_callback (const struct st_command_service_cbs cbs, enum cs_text_or_binary t_or_b, void cbs_ctx)

int	read_packet () override
	Forces read of packet from the connection. More...

int	get_command (COM_DATA com_data, enum_server_command cmd) override
	Reads from the line and parses the data into union COM_DATA. More...

enum enum_protocol_type	type () const override
	Returns the type of the protocol. More...

enum enum_vio_type	connection_type () const override
	Returns the type of the connection. More...

bool	store_null () override
	Sends null value. More...

bool	store_tiny (longlong from, uint32) override
	Sends TINYINT value. More...

bool	store_short (longlong from, uint32) override
	Sends SMALLINT value. More...

bool	store_long (longlong from, uint32) override
	Sends INT/INTEGER value. More...

bool	store_longlong (longlong from, bool is_unsigned, uint32) override
	Sends BIGINT value. More...

bool	store_decimal (const my_decimal *d, uint, uint) override
	Sends DECIMAL value. More...

bool	store_string (const char from, size_t length, const CHARSET_INFO fromcs) override
	Sends string (CHAR/VARCHAR/TEXT/BLOB) value. More...

bool	store_float (float from, uint32 decimals, uint32) override
	Sends FLOAT value. More...

bool	store_double (double from, uint32 decimals, uint32) override
	Sends DOUBLE value. More...

bool	store_datetime (const MYSQL_TIME &time, uint precision) override
	Sends DATETIME value. More...

bool	store_date (const MYSQL_TIME &time) override
	Sends DATE value. More...

bool	store_time (const MYSQL_TIME &time, uint precision) override
	Sends TIME value. More...

bool	store_field (const Field *field) override
	Sends Field. More...

ulong	get_client_capabilities () override
	Returns the capabilities supported by the protocol. More...

bool	has_client_capability (unsigned long capability) override
	Checks if the protocol supports a capability. More...

void	start_row () override
	Called BEFORE sending data row or before field_metadata. More...

bool	end_row () override
	Called AFTER sending data row or before field_metadata. More...

void	abort_row () override
	Called when a row is aborted. More...

void	end_partial_result_set () override
	Called in case of error while sending data. More...

int	shutdown (bool server_shutdown=false) override
	Called when the server shuts down the connection (THD is being destroyed). More...

bool	connection_alive () const override
	This function always returns true as in many places in the server this is a prerequisite for continuing operations. More...

uint	get_rw_status () override
	Should return protocol's reading/writing status. More...

bool	get_compression () override
	Checks if compression is enabled. More...

char *	get_compression_algorithm () override
	Checks if compression is enabled and return compression method name. More...

uint	get_compression_level () override
	Checks if compression is enabled and return compression level. More...

bool	start_result_metadata (uint num_cols, uint flags, const CHARSET_INFO *resultcs) override
	Called BEFORE sending metadata. More...

bool	send_field_metadata (Send_field field, const CHARSET_INFO cs) override
	Sends metadata of one field. More...

bool	end_result_metadata () override
	Called AFTER sending metadata. More...

bool	send_ok (uint server_status, uint warn_count, ulonglong affected_rows, ulonglong last_insert_id, const char *message) override
	Sends OK. More...

bool	send_eof (uint server_status, uint warn_count) override
	Sends end of file. More...

bool	send_error (uint sql_errno, const char err_msg, const char sql_state) override
	Sends error. More...

bool	store_ps_status (ulong stmt_id, uint column_count, uint param_count, ulong cond_count) override
	Sends prepared statement's id and metadata to the client after prepare. More...

bool	send_parameters (List< Item_param > *parameters, bool is_sql_prepare) override
	Sends the OUT-parameters to the client. More...

bool	flush () override
	Used for the classic protocol. More...

virtual bool	store_long (longlong from, uint32 zerofill)=0

bool	store_long (longlong from)

virtual bool	store_short (longlong from, uint32 zerofill)=0

bool	store_short (longlong from)

Public Member Functions inherited from Protocol
virtual	~Protocol ()=default

Protocol *	pop_protocol ()
	Remove the reference to the previous protocol and return it. More...

void	push_protocol (Protocol *protocol)
	Set reference to "this" as the previous protocol on the protocol provided as argument. More...

bool	store (int from)

bool	store (uint32 from)

bool	store (longlong from)

bool	store (ulonglong from)

bool	store_tiny (longlong from)

bool	store_short (longlong from)

bool	store_long (longlong from)

bool	store_longlong (longlong from, bool unsigned_flag)

bool	store (const char from, const CHARSET_INFO fromcs)
	Send \0 end terminated string. More...

bool	store (String *str)

bool	store (const LEX_STRING &s, const CHARSET_INFO *cs)

Private Member Functions
bool	set_variables_from_parameters (List< Item_param > *parameters)
	Set output parameters to variables bound at PS execution. More...

Private Attributes
void *	callbacks_ctx

struct st_command_service_cbs	callbacks

unsigned long	client_capabilities

bool	client_capabilities_set

enum cs_text_or_binary	text_or_binary

bool	in_meta_sending

Additional Inherited Members
Public Types inherited from Protocol
enum	enum_protocol_type { PROTOCOL_TEXT = 0 , PROTOCOL_BINARY = 1 , PROTOCOL_LOCAL = 2 , PROTOCOL_ERROR = 3 , PROTOCOL_PLUGIN = 4 }
	Enum used by type() to specify the protocol type. More...

enum	{ SEND_NUM_ROWS = 1 , SEND_DEFAULTS = 2 , SEND_EOF = 4 }
	Flags available to alter the way the messages are sent to the client. More...

using	Type = BaseProtocol::Type

Static Public Member Functions inherited from Protocol
static Type	get_default ()

static Type	get_by_name (const std::string &name)
	Returns type of the protocol by its name. More...

static std::string	to_string (const Type &type)

static uint16_t	get_default_port (Type type)
	Returns default port for the selected protocol. More...

Constructor & Destructor Documentation

◆ Protocol_callback()

Protocol_callback::Protocol_callback	(	const struct st_command_service_cbs *	cbs,
		enum cs_text_or_binary	t_or_b,
		void *	cbs_ctx
	)

inline

Member Function Documentation

◆ abort_row()

void Protocol_callback::abort_row ( )

overridevirtual

Called when a row is aborted.

Implements Protocol.

◆ connection_alive()

bool Protocol_callback::connection_alive ( ) const

overridevirtual

This function always returns true as in many places in the server this is a prerequisite for continuing operations.

Returns if the connection is alive or dead.

Return values

true alive

Note: If there's no callback provided, this function always returns true because, in many places in the server, this is a prerequisite for continuing operations. If the user is connection bound, a callback function should be provided, to have a possibility to stop execution of operations when the user disconnected.

Returns: true connected false disconnected

Implements Protocol.

◆ connection_type()

enum enum_vio_type Protocol_callback::connection_type ( ) const

overridevirtual

Returns the type of the connection.

Returns: enum enum_vio_type; VIO_TYPE_PLUGIN

Implements Protocol.

◆ end_partial_result_set()

void Protocol_callback::end_partial_result_set ( )

overridevirtual

Called in case of error while sending data.

Implements Protocol.

◆ end_result_metadata()

bool Protocol_callback::end_result_metadata ( )

overridevirtual

Called AFTER sending metadata.

Return values

true	failure
false	success

Returns: true failure false success

Implements Protocol.

◆ end_row()

bool Protocol_callback::end_row ( )

overridevirtual

Called AFTER sending data row or before field_metadata.

Called AFTER sending all fields of a row, or after field_metadata().

Please read the big comment in start_row() for explanation why in_meta_sending is used.

Returns: true ok false not ok

Implements Protocol.

◆ flush()

bool Protocol_callback::flush ( )

overridevirtual

Used for the classic protocol.

Makes the protocol send the messages/data to the client.

Return values

false	The flush was successful.
true	An error occurred.

Implements Protocol.

◆ get_client_capabilities()

ulong Protocol_callback::get_client_capabilities ( )

overridevirtual

Returns the capabilities supported by the protocol.

Implements Protocol.

◆ get_command()

int Protocol_callback::get_command	(	COM_DATA *	com_data,
		enum_server_command *	cmd
	)

overridevirtual

Reads from the line and parses the data into union COM_DATA.

Practically does nothing.

Returns: bytes read

Return values

-1 failure

See the comment of read_packet(). Always returns -1.

Returns: -1

Implements Protocol.

◆ get_compression()

bool Protocol_callback::get_compression ( )

overridevirtual

Checks if compression is enabled.

Should check if compression is enabled.

Return values

true	enabled
false	disabled

Returns always false (no compression)

Returns: false disabled

Implements Protocol.

◆ get_compression_algorithm()

char * Protocol_callback::get_compression_algorithm ( )

overridevirtual

Checks if compression is enabled and return compression method name.

Always returns null.

Returns: algorithm name if compression is supported else null; null compression not supported

Implements Protocol.

◆ get_compression_level()

uint Protocol_callback::get_compression_level ( )

overridevirtual

Checks if compression is enabled and return compression level.

Always returns 0.

Returns: compression level if compression is supported else 0; compression not supported

Implements Protocol.

◆ get_rw_status()

uint Protocol_callback::get_rw_status ( )

overridevirtual

Should return protocol's reading/writing status.

Returns 0 (idle) as it this is the best guess that can be made as there is no callback for get_rw_status().

Returns: 0

Implements Protocol.

◆ has_client_capability()

bool Protocol_callback::has_client_capability ( unsigned long capability )

overridevirtual

Checks if the protocol supports a capability.

Parameters

capability the capability

Return values

true	supports
false	does not support

Implements Protocol.

◆ read_packet()

int Protocol_callback::read_packet ( )

overridevirtual

Forces read of packet from the connection.

Practically does nothing.

Returns: bytes read

Return values

-1 failure

Returns -1, error, for the case this will be called. It should happen. read_packet() is called by get_command() which in turn is called by do_command() in sql_parse. After that COM_DATA is filled with proper info that in turn is passed to dispatch_command(). The Command service doesn't use do_command() but dispatch_command() and passes COM_DATA directly from the user(plugin).

Returns: -1 failure

Implements Protocol.

◆ send_eof()

bool Protocol_callback::send_eof	(	uint	server_status,
		uint	warn_count
	)

overridevirtual

Sends end of file.

This will be called once all data has been sent.

Parameters

server_status	Bit field with different statuses. See SERVER_STATUS_*
warn_count	The warning count generated by the execution of the statement.

Return values

true	failure
false	success

Returns: true failure false success

Implements Protocol.

◆ send_error()

bool Protocol_callback::send_error	(	uint	sql_errno,
		const char *	err_msg,
		const char *	sql_state
	)

overridevirtual

Sends error.

Parameters

sql_errno	Error number, beginning from 1000
err_msg	The error message
sql_state	The SQL state - 5 char string

Return values

true	failure
false	success

Returns: true failure false success

Implements Protocol.

◆ send_field_metadata()

bool Protocol_callback::send_field_metadata	(	Send_field *	field,
		const CHARSET_INFO *	cs
	)

overridevirtual

Sends metadata of one field.

Called for every column in the result set.

Parameters

field	Field's metadata
cs	Charset

Return values

true	failure
false	success

Called for every column in the result set.

Returns: true failure false success

Implements Protocol.

◆ send_ok()

bool Protocol_callback::send_ok	(	uint	server_status,
		uint	warn_count,
		ulonglong	affected_rows,
		ulonglong	last_insert_id,
		const char *	message
	)

overridevirtual

Sends OK.

Parameters

server_status	Bit field with different statuses. See SERVER_STATUS_*
warn_count	Warning count from the execution
affected_rows	Rows changed/deleted during the operation
last_insert_id	ID of the last insert row, which has AUTO_INCROMENT column
message	Textual message from the execution. May be NULL.

Return values

true	failure
false	success

Returns: true failure false success

Implements Protocol.

◆ send_parameters()

bool Protocol_callback::send_parameters	(	List< Item_param > *	parameters,
		bool	is_sql_prepare
	)

overridevirtual

Sends the OUT-parameters to the client.

Parameters

parameters	List of PS/SP parameters (both input and output).
is_sql_prepare	Used for the legacy protocol. If we're dealing with sql prepare then text protocol will be used.

Returns: Error status.

Return values

false	Success.
true	Error.

Implements Protocol.

◆ set_variables_from_parameters()

bool Protocol_callback::set_variables_from_parameters ( List< Item_param > * parameters )

private

Set output parameters to variables bound at PS execution.

This method handles the case when preparing and executing was done through SQL (not by COM_STMT_PREPARE/COM_STMT_EXECUTE) in which output parameters are not going to be send to client (or 'st_command_service_cbs'), instead they will set concrete session variables.

Parameters

parameters List of PS/SP parameters (both input and output).

Return values

false	success
true	failure

◆ shutdown()

int Protocol_callback::shutdown ( bool server_shutdown = false )

overridevirtual

Called when the server shuts down the connection (THD is being destroyed).

In this regard, this is also called when the server shuts down. The callback implementor can differentiate between those 2 events by inspecting the shutdown_type parameter.

Parameters

server_shutdown Whether this is a normal connection shutdown (false) or a server shutdown (true).

Return values

0	success
!0	failure

In this regard, this is also called when the server shuts down. The callback implementor can differentiate between those 2 events by inspecting the server_shutdown parameter.

Parameters

server_shutdown Whether this is a normal connection shutdown (false) or a server shutdown (true).

Returns: 0 success !0 failure

Implements Protocol.

◆ start_result_metadata()

bool Protocol_callback::start_result_metadata	(	uint	num_cols,
		uint	flags,
		const CHARSET_INFO *	resultcs
	)

overridevirtual

Called BEFORE sending metadata.

Parameters

num_cols	Number of columns in the result set
flags	flags to be used to alter the way the messages are sent to the client, see Protocol class for SEND_NUM_ROWS, SEND_DEFAULTS, SEND_EOF
resultcs	The character set of the results. Can be different from the one in the field metadata.

Return values

true	failure
false	success

Returns: true failure false success

Implements Protocol.

◆ start_row()

void Protocol_callback::start_row ( )

overridevirtual

Called BEFORE sending data row or before field_metadata.

Implements Protocol.

◆ store_date()

bool Protocol_callback::store_date ( const MYSQL_TIME & time )

overridevirtual

Sends DATE value.

Parameters

time value

Return values

false	success
true	failure

Implements Protocol.

◆ store_datetime()

bool Protocol_callback::store_datetime	(	const MYSQL_TIME &	time,
		uint	precision
	)

overridevirtual

Sends DATETIME value.

Parameters

time	value
precision	fractional seconds precision. 0 ... DATETIME_MAX_DECIMALS

Return values

false	success
true	failure

Implements Protocol.

◆ store_decimal()

bool Protocol_callback::store_decimal	(	const my_decimal *	d,
		uint	,
		uint
	)

overridevirtual

Sends DECIMAL value.

Parameters

d value

Return values

false	success
true	failure

Parameters

d value

Returns: false success true failure

Implements Protocol.

◆ store_double()

bool Protocol_callback::store_double	(	double	from,
		uint32	decimals,
		uint32
	)

overridevirtual

Sends DOUBLE value.

Parameters

from	value
decimals	number of digits to use after decimal point, unless it is DECIMAL_NOT_SPECIFIED

Return values

false	success
true	failure

Implements Protocol.

◆ store_field()

bool Protocol_callback::store_field ( const Field * field )

overridevirtual

Sends Field.

Parameters

field the field to be sent through the protocol

Return values

false	success
true	failure

Implements Protocol.

◆ store_float()

bool Protocol_callback::store_float	(	float	from,
		uint32	decimals,
		uint32
	)

overridevirtual

Sends FLOAT value.

Parameters

from	value
decimals	number of digits to use after decimal point, unless it is DECIMAL_NOT_SPECIFIED

Return values

false	success
true	failure

Implements Protocol.

◆ store_long() [1/3]

bool Protocol::store_long ( longlong from )

inline

◆ store_long() [2/3]

virtual bool Protocol::store_long	(	longlong	from,
		uint32	zerofill
	)

virtual

Implements Protocol.

◆ store_long() [3/3]

bool Protocol_callback::store_long	(	longlong	from,
		uint32
	)

overridevirtual

Sends INT/INTEGER value.

Parameters

from value

Return values

false	success
true	failure

Implements Protocol.

◆ store_longlong()

bool Protocol_callback::store_longlong	(	longlong	from,
		bool	is_unsigned,
		uint32
	)

overridevirtual

Sends BIGINT value.

Parameters

from	value
is_unsigned	from is unsigned

Return values

false	success
true	failure

Implements Protocol.

◆ store_null()

bool Protocol_callback::store_null ( )

overridevirtual

Sends null value.

Return values

false	success
true	failure

Implements Protocol.

◆ store_ps_status()

bool Protocol_callback::store_ps_status	(	ulong	stmt_id,
		uint	column_count,
		uint	param_count,
		ulong	cond_count
	)

overridevirtual

Sends prepared statement's id and metadata to the client after prepare.

Parameters

stmt_id	Statement id.
column_count	Number of columns.
param_count	Number of parameters.
cond_count	Number of conditions raised by the current statement.

Returns: Error status.

Return values

false	The send was successful.
true	An error occurred.

Implements Protocol.

◆ store_short() [1/3]

bool Protocol::store_short ( longlong from )

inline

◆ store_short() [2/3]

virtual bool Protocol::store_short	(	longlong	from,
		uint32	zerofill
	)

virtual

Implements Protocol.

◆ store_short() [3/3]

bool Protocol_callback::store_short	(	longlong	from,
		uint32
	)

overridevirtual

Sends SMALLINT value.

Parameters

from value

Return values

false	success
true	failure

Implements Protocol.

◆ store_string()

bool Protocol_callback::store_string	(	const char *	from,
		size_t	length,
		const CHARSET_INFO *	fromcs
	)

overridevirtual

Sends string (CHAR/VARCHAR/TEXT/BLOB) value.

Return values

false	success
true	failure

Implements Protocol.

◆ store_time()

bool Protocol_callback::store_time	(	const MYSQL_TIME &	time,
		uint	precision
	)

overridevirtual

Sends TIME value.

Parameters

time	value
precision	fractional seconds precision. 0 ... DATETIME_MAX_DECIMALS

Return values

false	success
true	failure

Implements Protocol.

◆ store_tiny()

bool Protocol_callback::store_tiny	(	longlong	from,
		uint32
	)

overridevirtual

Sends TINYINT value.

Parameters

from value

Return values

false	success
true	failure

Implements Protocol.

◆ type()

enum enum_protocol_type Protocol_callback::type ( ) const

inlineoverridevirtual

Returns the type of the protocol.

Return values

false	success
true	failure

Implements Protocol.

Member Data Documentation

◆ callbacks

struct st_command_service_cbs Protocol_callback::callbacks

private

◆ callbacks_ctx

void* Protocol_callback::callbacks_ctx

private

◆ client_capabilities

unsigned long Protocol_callback::client_capabilities

private

◆ client_capabilities_set

bool Protocol_callback::client_capabilities_set

private

◆ in_meta_sending

bool Protocol_callback::in_meta_sending

private

◆ text_or_binary

enum cs_text_or_binary Protocol_callback::text_or_binary

private

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

sql/protocol_callback.h
sql/protocol_callback.cc

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ Protocol_callback()

Member Function Documentation

◆ abort_row()

◆ connection_alive()

◆ connection_type()

◆ end_partial_result_set()

◆ end_result_metadata()

◆ end_row()

◆ flush()

◆ get_client_capabilities()

◆ get_command()

◆ get_compression()

◆ get_compression_algorithm()

◆ get_compression_level()

◆ get_rw_status()

◆ has_client_capability()

◆ read_packet()

◆ send_eof()

◆ send_error()

◆ send_field_metadata()

◆ send_ok()

◆ send_parameters()

◆ set_variables_from_parameters()

◆ shutdown()

◆ start_result_metadata()

◆ start_row()

◆ store_date()

◆ store_datetime()

◆ store_decimal()

◆ store_double()

◆ store_field()

◆ store_float()

◆ store_long() [1/3]

◆ store_long() [2/3]

◆ store_long() [3/3]

◆ store_longlong()

◆ store_null()

◆ store_ps_status()

◆ store_short() [1/3]

◆ store_short() [2/3]

◆ store_short() [3/3]

◆ store_string()

◆ store_time()

◆ store_tiny()

◆ type()

Member Data Documentation

◆ callbacks

◆ callbacks_ctx

◆ client_capabilities

◆ client_capabilities_set

◆ in_meta_sending

◆ text_or_binary