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MAX-157. Added support for hints in rwsplit router.

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buffer.c: added memory release for hint of a GWBUF
hint.c: added bool hint_exists()
hint.h: added placeholder for hint type HINT_ROUTE_TO_ALL which doesn't have implementation yet.
filter/Makefile: fixed dependency issue
hintparser.c: added const char* token_get_keyword(), hint_parser:added NULL check, hint_next_token: fixed off-by-one bug
readwritesplit.h: added bitfield for hints' use, which includes route targets and flag for case where user hinted to route to named backend server.
readwritesplit.c: added function route_target_t get_route_target() for resolving route target based on 1) query type (from query_classifier) 2) transaction state (active/not) and 3) hints. Modified get_dcb, which is called in routeQuery to provide pointer to correct backend DCB. Now get_dcb also takes server unique name as a parameter if such a hint was found. for hints' use, which includes  enter the commit message for your changes.
This commit is contained in:
VilhoRaatikka
2014-07-31 23:40:02 +03:00
parent ef924cdc00
commit 4f3d746f4e
8 changed files with 342 additions and 136 deletions
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7
server/include/hint.h
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@ -30,6 +30,9 @@
* @endverbatim
*/
#include <skygw_debug.h>
/**
* The types of hint that are supported by the generic hinting mechanism.
*/
@ -38,6 +41,7 @@ typedef enum {
HINT_ROUTE_TO_SLAVE,
HINT_ROUTE_TO_NAMED_SERVER,
HINT_ROUTE_TO_UPTODATE_SERVER,
HINT_ROUTE_TO_ALL, /*< not implemented yet */
HINT_PARAMETER
} HINT_TYPE;
@ -50,7 +54,7 @@ typedef enum {
*/
typedef struct hint {
HINT_TYPE type; /*< The Type of hint */
void *data; /*< Type sepecific data */
void *data; /*< Type specific data */
void *value; /*< Parameter value for hint */
unsigned int dsize; /*< Size of the hint data */
struct hint *next; /*< Another hint for this buffer */
@ -61,4 +65,5 @@ extern HINT *hint_create_parameter(HINT *, char *, char *);
extern HINT *hint_create_route(HINT *, HINT_TYPE, char *);
extern void hint_free(HINT *);
extern HINT *hint_dup(HINT *);
bool hint_exists(HINT **, HINT_TYPE);
#endif