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Core changes to support tee filter.

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This commit is contained in:
Mark Riddoch
2014-06-20 17:49:40 +01:00
parent e98b5d411e
commit 7067e43b44
5 changed files with 62 additions and 3 deletions
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55
server/core/dcb.c
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@ -48,6 +48,7 @@
* This fixes a bug with many reads from
* backend
* 07/05/2014 Mark Riddoch Addition of callback mechanism
* 20/06/2014 Mark Riddoch Addition of dcb_clone
*
* @endverbatim
*/
@ -84,6 +85,9 @@ static bool dcb_set_state_nomutex(
dcb_state_t* old_state);
static void dcb_call_callback(DCB *dcb, DCB_REASON reason);
static DCB* dcb_get_next (DCB* dcb);
static int dcb_null_write(DCB *dcb, GWBUF *buf);
static int dcb_null_close(DCB *dcb);
static int dcb_null_auth(DCB *dcb, SERVER *server, SESSION *session, GWBUF *buf);
DCB* dcb_get_zombies(void)
{
@ -248,7 +252,38 @@ dcb_add_to_zombieslist(DCB *dcb)
spinlock_release(&zombiespin);
}
/*
* Clone a DCB for internal use, mostly used for specialist filters
* to create dummy clients based on real clients.
*
* @param orig The DCB to clone
* @return A DCB that can be used as a client
*/
DCB *
dcb_clone(DCB *orig)
{
DCB *clone;
if ((clone = dcb_alloc(DCB_ROLE_REQUEST_HANDLER)) == NULL)
{
return NULL;
}
clone->fd = -1;
clone->state = orig->state;
clone->data = orig->data;
if (orig->remote)
clone->remote = strdup(orig->remote);
if (orig->user)
clone->user = strdup(orig->user);
clone->protocol = orig->protocol;
clone->func.write = dcb_null_write;
clone->func.close = dcb_null_close;
clone->func.auth = dcb_null_auth;
return clone;
}
/**
* Free a DCB and remove it from the chain of all DCBs
@ -1821,4 +1856,22 @@ void dcb_call_foreach (
}
return;
}
static int
dcb_null_write(DCB *dcb, GWBUF *buf)
{
return 1;
}
static int
dcb_null_close(DCB *dcb)
{
return 0;
}
static int
dcb_null_auth(DCB *dcb, SERVER *server, SESSION *session, GWBUF *buf)
{
return 0;
}