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[MEDIUM] add the "nbsrv" ACL verb

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The new "nbsrv" ACL verb matches the number of active servers in a backend.
By default, it applies to the backend where it is declared, but optionally
it can receive the name of another backend as an argument in parenthesis.

It counts the number of enabled active servers first, then the number of
enabled backup servers.
This commit is contained in:
Willy Tarreau 2007-11-30 20:48:53 +01:00
parent c8f24f8ec1
commit a9d3c1e6a3
1 changed files with 47 additions and 0 deletions
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47
src/backend.c
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@ -22,6 +22,7 @@
#include <common/eb32tree.h>
#include <common/time.h>
#include <types/acl.h>
#include <types/buffers.h>
#include <types/global.h>
#include <types/polling.h>
@ -29,6 +30,7 @@
#include <types/server.h>
#include <types/session.h>
#include <proto/acl.h>
#include <proto/backend.h>
#include <proto/client.h>
#include <proto/fd.h>
@ -1541,6 +1543,51 @@ int backend_parse_balance(const char **args, char *err, int errlen, struct proxy
return 0;
}
/************************************************************************/
/* All supported keywords must be declared here. */
/************************************************************************/
/* set test->i to the number of enabled servers on the proxy */
static int
acl_fetch_nbsrv(struct proxy *px, struct session *l4, void *l7, int dir,
struct acl_expr *expr, struct acl_test *test)
{
test->flags = ACL_TEST_F_VOL_TEST;
if (expr->arg_len) {
/* another proxy was designated, we must look for it */
for (px = proxy; px; px = px->next)
if ((px->cap & PR_CAP_BE) && !strcmp(px->id, expr->arg.str))
break;
}
if (!px)
return 0;
if (px->srv_act)
test->i = px->srv_act;
else if (px->lbprm.fbck)
test->i = 1;
else
test->i = px->srv_bck;
return 1;
}
/* Note: must not be declared <const> as its list will be overwritten */
static struct acl_kw_list acl_kws = {{ },{
{ "nbsrv", acl_parse_int, acl_fetch_nbsrv, acl_match_int },
{ NULL, NULL, NULL, NULL },
}};
__attribute__((constructor))
static void __backend_init(void)
{
acl_register_keywords(&acl_kws);
}
/*
* Local variables:
* c-indent-level: 8