json_diff.cc File Reference

#include "sql-common/json_diff.h"
#include <cassert>
#include <optional>
#include <utility>
#include "my_alloc.h"
#include "my_byteorder.h"
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_sys.h"
#include "mysql/components/services/bits/psi_bits.h"
#include "mysql_com.h"
#include "mysqld_error.h"
#include "sql-common/json_binary.h"
#include "sql-common/json_dom.h"
#include "sql-common/json_error_handler.h"
#include "sql-common/json_path.h"
#include "sql/current_thd.h"
#include "sql/log_event.h"
#include "sql/psi_memory_key.h"
#include "sql/sql_class.h"
#include "sql/sql_const.h"
#include "sql/system_variables.h"
#include "sql/table.h"
#include "sql_string.h"
#include "template_utils.h"

Functions
static size_t	length_of_length_and_string (size_t length)
	Return the total size of a data field, plus the size of the preceding integer that describes the length, when the integer is stored in net_field_length() format. More...
static bool	write_length_and_string (String *to, const String &from)
	Encode a String as (length, data) pair, with length being stored in net_field_length() format. More...
optional< ReadJsonDiffResult >	read_json_diff (const unsigned char *pos, size_t length)
	Read one JSON diff from a buffer. More...
static Json_dom *	seek_exact_path (Json_dom *dom, const Json_path_iterator &first_leg, const Json_path_iterator &last_leg)
	Find the value at the specified path in a JSON DOM. More...
enum_json_diff_status	apply_json_diff (const Json_diff &diff, Json_dom *dom)
	Apply one JSON diff to the DOM provided. More...

Variables
static MEM_ROOT	empty_json_diff_vector_mem_root (PSI_NOT_INSTRUMENTED, 256)

Function Documentation

apply_json_diff()

enum_json_diff_status apply_json_diff	(	const Json_diff &	diff,
		Json_dom *	dom
	)

Apply one JSON diff to the DOM provided.

Parameters

diff	The diff which contains the path to apply it and the new value.
dom	The DOM to apply the diff to.

Returns

An enum_json_diff_status value that tells if the diff was applied successfully.

length_of_length_and_string()

static size_t length_of_length_and_string ( size_t  length )

static

Return the total size of a data field, plus the size of the preceding integer that describes the length, when the integer is stored in net_field_length() format.

Parameters

length

The length of the data

Returns

The length of the data plus the length of the length field.

read_json_diff()

optional< ReadJsonDiffResult > read_json_diff	(	const unsigned char *	pos,
		size_t	length
	)

Read one JSON diff from a buffer.

Parameters

pos	The position to start reading from in the buffer. When the function returns, it will be set to the position right after the last byte read.
length	The maximum number of bytes to read from the buffer.

Returns

An object containing the Json_diff value and the number of bytes read, if successful. An empty value if an error was raised, or if the buffer did not contain a valid diff.

seek_exact_path()

static Json_dom * seek_exact_path ( Json_dom *  dom, const Json_path_iterator &  first_leg, const Json_path_iterator &  last_leg  )

static

Find the value at the specified path in a JSON DOM.

The path should not contain any wildcard or ellipsis, only simple array cells or member names. Auto-wrapping is not performed.

Parameters

dom	the root of the DOM
first_leg	the first path leg
last_leg	the last path leg (exclusive)

Returns

the JSON DOM at the given path, or nullptr if the path is not found

write_length_and_string()

static bool write_length_and_string ( String *  to, const String &  from  )

static

Encode a String as (length, data) pair, with length being stored in net_field_length() format.

Parameters

to	Buffer where length and data will be stored.
from	Source string containing the data.

Returns

true on out of memory, false on success.

Variable Documentation

empty_json_diff_vector_mem_root

MEM_ROOT empty_json_diff_vector_mem_root(PSI_NOT_INSTRUMENTED, 256) ( PSI_NOT_INSTRUMENTED  , 256    )

static