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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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8
server/core/buffer.c
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@ -116,6 +116,12 @@ BUF_PROPERTY *prop;
free(prop->value);
free(prop);
}
while (buf->hint)
{
HINT* h = buf->hint;
buf->hint = buf->hint->next;
hint_free(h);
}
free(buf);
}
@ -145,6 +151,7 @@ GWBUF *rval;
rval->end = buf->end;
rval->gwbuf_type = buf->gwbuf_type;
rval->properties = NULL;
rval->hint = NULL;
rval->next = NULL;
CHK_GWBUF(rval);
return rval;
@ -172,6 +179,7 @@ GWBUF *gwbuf_clone_portion(
clonebuf->end = (void *)((char *)clonebuf->start)+length;
clonebuf->gwbuf_type = buf->gwbuf_type; /*< clone the type for now */
clonebuf->properties = NULL;
clonebuf->hint = NULL;
clonebuf->next = NULL;
CHK_GWBUF(clonebuf);
return clonebuf;