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MXS-852: Add PS response and command extraction functions

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The mxs_mysql_extract_ps_response function extracts the binary protocol
prepared statement components and stores them in a common structure.

The mxs_mysql_get_command extracts the command byte from a GWBUF object
containing a complete MySQL packet.
This commit is contained in:
Markus Mäkelä
2017-06-21 13:29:59 +03:00
parent 6cd6ded3d8
commit dd90ad01b6
3 changed files with 91 additions and 16 deletions
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32
include/maxscale/protocol/mysql.h
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@ -84,9 +84,13 @@ MXS_BEGIN_DECLS
* [10-11] warning_count (2) -- number of warnings
*/
#define MYSQL_PS_ID_OFFSET MYSQL_HEADER_LEN + 1
#define MYSQL_PS_ID_SIZE 4
#define MYSQL_PS_COLS_OFFSET MYSQL_HEADER_LEN + 5
#define MYSQL_PS_COLS_SIZE 2
#define MYSQL_PS_PARAMS_OFFSET MYSQL_HEADER_LEN + 7
#define MYSQL_PS_PARAMS_SIZE 2
#define MYSQL_PS_WARN_OFFSET MYSQL_HEADER_LEN + 10
#define MYSQL_PS_WARN_SIZE 2
/** Name of the default server side authentication plugin */
#define DEFAULT_MYSQL_AUTH_PLUGIN "mysql_native_password"
@ -308,6 +312,14 @@ typedef struct
#endif
} MySQLProtocol;
typedef struct
{
uint32_t id;
uint16_t columns;
uint16_t parameters;
uint16_t warnings;
} MXS_PS_RESPONSE;
/** Defines for response codes */
#define MYSQL_REPLY_ERR 0xff
#define MYSQL_REPLY_OK 0x00
@ -504,4 +516,24 @@ const char* mxs_mysql_get_current_db(MXS_SESSION* session);
*/
void mxs_mysql_set_current_db(MXS_SESSION* session, const char* db);
/**
* @brief Get the command byte
*
* @param buffer Buffer containing a complete MySQL packet
*
* @return The command byte
*/
uint8_t mxs_mysql_get_command(GWBUF* buffer);
/**
* @brief Extract PS response values
*
* @param buffer Buffer containing a complete response to a binary protocol
* preparation of a prepared statement
* @param out Destination where the values are extracted
*
* @return True if values were extracted successfully
*/
bool mxs_mysql_extract_ps_response(GWBUF* buffer, MXS_PS_RESPONSE* out);
MXS_END_DECLS