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MINOR: backend: rename sample fetch functions and declare the sample keywords

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The following sample fetch functions were only usable by ACLs but are now
usable by sample fetches too :

  avg_queue, be_conn, be_id, be_sess_rate, connslots, nbsrv,
  queue, srv_conn, srv_id, srv_is_up, srv_sess_rate

The fetch functions have been renamed "smp_fetch_*".
This commit is contained in:
Willy Tarreau 2013-01-07 22:38:03 +01:00
parent d4c33c8889
commit 1a7eca19b8
2 changed files with 125 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
doc/configuration.txt
View File

@ -9548,6 +9548,25 @@ The list of currently supported pattern fetch functions is the following :
always_true
Always returns the boolean "true" value.
avg_queue([<backend>])
Returns the total number of queued connections of the designated
backend divided by the number of active servers. The current
backend is used if no backend is specified. This is very similar
to "queue" except that the size of the farm is considered, in
order to give a more accurate measurement of the time it may
take for a new connection to be processed. The main usage is
with ACL to return a sorry page to new users when it becomes
certain they will get a degraded service, or to pass to the
backend servers in a header so that they decide to work in
degraded mode or to disable some functions to speed up the
processing a bit. Note that in the event there would not be
any active server anymore, we would consider twice the number
of queued connections as the measured value. This is a fair
estimate, as we expect one server to get back soon anyway, but
we still prefer to send new traffic to another backend if in
better shape. See also the "queue", "be_conn", and
"be_sess_rate" sample fetches.
base This returns the concatenation of the first Host header and the
path part of the request, which starts at the first slash and
ends before the question mark. It can be useful in virtual
@ -9567,6 +9586,32 @@ The list of currently supported pattern fetch functions is the following :
size of 8 or 20 bytes depending on the source address family.
This can be used to track per-IP, per-URL counters.
be_conn([<backend>])
Returns the number of currently established connections on the
the backend, possibly including the connection being evaluated.
If no backend name is specified, the current one is used. But it
is also possible to check another backend. It can be used to use
a specific farm when the nominal one is full. See also the
"fe_conn", "queue" and "be_sess_rate" criteria.
be_id Returns an integer containing the current backend's id.
be_sess_rate([<backend>])
Returns an integer value corresponding to the sessions creation
rate on the backend, in number of new sessions per second. This
is used with ACLs to switch to an alternate backend when an
expensive or fragile one reaches too high a session rate, or to
limit abuse of service (eg. prevent sucking of an online
dictionary). It can also be useful to add this element to logs
using a log-format directive.
connslots([<backend>])
Returns an integer value corresponding to the number of
connection slots still available in the backend, by totalizing
the maximum amount of connections on all servers and the maximum
queue size. This is only used with ACLs. See the ACL "connslots"
keyword description for more information on possible caveats.
cookie(<name>)
This extracts the last occurrence of the cookie name <name> on a
"Cookie" header line from the request, or a "Set-Cookie" header
@ -9600,6 +9645,12 @@ The list of currently supported pattern fetch functions is the following :
last one. A typical use is with the X-Forwarded-For header once
converted to IP, associated with an IP stick-table.
nbsrv([<backend>])
Returns an integer value corresponding to the number of usable
servers of either the current backend or the named backend. This
is mostly used with ACLs but can also be useful when added to
logs.
path This extracts the request's URL path (without the host part). A
typical use is with prefetch-capable caches, and with portals
which need to aggregate multiple information from databases and
@ -9622,6 +9673,13 @@ The list of currently supported pattern fetch functions is the following :
<lengthoffset> + <lengthsize> else it is absolute.
Ex: see SSL session id example in "stick table" chapter.
queue([<backend>])
Returns the total number of queued connections of the designated
backend, including all the connections in server queues. If no
backend name is specified, the current one is used, but it is
also possible to check another one. This is useful with ACLs
or to pass statistics to backend servers.
rdp_cookie(<name>)
This extracts the value of the rdp cookie <name> as a string
and uses this value to match. This enables implementation of
@ -9718,6 +9776,27 @@ The list of currently supported pattern fetch functions is the following :
that this function will be useful but it's available at no cost.
It is of type integer and only works with such tables.
srv_conn(<backend>/<server>)
Returns an integer value corresponding to the number of
currently established connections on this server, possibly
including the connection being evaluated. It is only used with
ACLs.
srv_id Returns an integer containing the server's id when processing
the response. While it's almost only used with ACLs, it may be
used for logging or debugging.
srv_is_up([<backend>/]<server>)
Returns a the boolean TRUE value when the designated server is
UP, and false when it is either DOWN or in maintenance mode. If
<backend> is omitted, then the server is looked up in the
current backend. It is almost only used with ACLs.
srv_sess_rate(<backend>/<server>)
Returns an integer corresponding to the sessions creation rate
on the server, in number of new sessions per second. This is
used with ACLs but may make sense with logs too.
ssl_c_ca_err Returns the ID of the first error detected during verify of the
client certificate at depth > 0, or 0 if no error was detected.

71
src/backend.c
View File

@ -1,7 +1,7 @@
/*
* Backend variables and functions.
*
* Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
* Copyright 2000-2013 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@ -1370,7 +1370,7 @@ int backend_parse_balance(const char **args, char **err, struct proxy *curproxy)
/************************************************************************/
/* All supported keywords must be declared here. */
/* All supported sample and ACL keywords must be declared here. */
/************************************************************************/
/* set temp integer to the number of enabled servers on the proxy.
@ -1378,7 +1378,7 @@ int backend_parse_balance(const char **args, char **err, struct proxy *curproxy)
* undefined behaviour.
*/
static int
acl_fetch_nbsrv(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
smp_fetch_nbsrv(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
smp->flags = SMP_F_VOL_TEST;
@ -1401,7 +1401,7 @@ acl_fetch_nbsrv(struct proxy *px, struct session *l4, void *l7, unsigned int opt
* undefined behaviour.
*/
static int
acl_fetch_srv_is_up(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
smp_fetch_srv_is_up(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
struct server *srv = args->data.srv;
@ -1421,7 +1421,7 @@ acl_fetch_srv_is_up(struct proxy *px, struct session *l4, void *l7, unsigned int
* undefined behaviour.
*/
static int
acl_fetch_connslots(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
smp_fetch_connslots(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
struct server *iterator;
@ -1449,7 +1449,7 @@ acl_fetch_connslots(struct proxy *px, struct session *l4, void *l7, unsigned int
/* set temp integer to the id of the backend */
static int
acl_fetch_be_id(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
smp_fetch_be_id(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
smp->flags = SMP_F_VOL_TXN;
@ -1460,7 +1460,7 @@ acl_fetch_be_id(struct proxy *px, struct session *l4, void *l7, unsigned int opt
/* set temp integer to the id of the server */
static int
acl_fetch_srv_id(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
smp_fetch_srv_id(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
if (!objt_server(l4->target))
@ -1477,7 +1477,7 @@ acl_fetch_srv_id(struct proxy *px, struct session *l4, void *l7, unsigned int op
* undefined behaviour.
*/
static int
acl_fetch_be_sess_rate(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
smp_fetch_be_sess_rate(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
smp->flags = SMP_F_VOL_TEST;
@ -1491,7 +1491,7 @@ acl_fetch_be_sess_rate(struct proxy *px, struct session *l4, void *l7, unsigned
* undefined behaviour.
*/
static int
acl_fetch_be_conn(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
smp_fetch_be_conn(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
smp->flags = SMP_F_VOL_TEST;
@ -1505,7 +1505,7 @@ acl_fetch_be_conn(struct proxy *px, struct session *l4, void *l7, unsigned int o
* undefined behaviour.
*/
static int
acl_fetch_queue_size(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
smp_fetch_queue_size(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
smp->flags = SMP_F_VOL_TEST;
@ -1523,7 +1523,7 @@ acl_fetch_queue_size(struct proxy *px, struct session *l4, void *l7, unsigned in
* undefined behaviour.
*/
static int
acl_fetch_avg_queue_size(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
smp_fetch_avg_queue_size(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
int nbsrv;
@ -1552,7 +1552,7 @@ acl_fetch_avg_queue_size(struct proxy *px, struct session *l4, void *l7, unsigne
* undefined behaviour.
*/
static int
acl_fetch_srv_conn(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
smp_fetch_srv_conn(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
smp->flags = SMP_F_VOL_TEST;
@ -1566,7 +1566,7 @@ acl_fetch_srv_conn(struct proxy *px, struct session *l4, void *l7, unsigned int
* undefined behaviour.
*/
static int
acl_fetch_srv_sess_rate(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
smp_fetch_srv_sess_rate(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp)
{
smp->flags = SMP_F_VOL_TEST;
@ -1575,28 +1575,49 @@ acl_fetch_srv_sess_rate(struct proxy *px, struct session *l4, void *l7, unsigned
return 1;
}
/* Note: must not be declared <const> as its list will be overwritten.
* Please take care of keeping this list alphabetically sorted.
*/
static struct sample_fetch_kw_list smp_kws = {{ },{
{ "avg_queue", smp_fetch_avg_queue_size, ARG1(1,BE), NULL, SMP_T_UINT, SMP_USE_INTRN, },
{ "be_conn", smp_fetch_be_conn, ARG1(1,BE), NULL, SMP_T_UINT, SMP_USE_INTRN, },
{ "be_id", smp_fetch_be_id, 0, NULL, SMP_T_UINT, SMP_USE_BKEND, },
{ "be_sess_rate", smp_fetch_be_sess_rate, ARG1(1,BE), NULL, SMP_T_UINT, SMP_USE_INTRN, },
{ "connslots", smp_fetch_connslots, ARG1(1,BE), NULL, SMP_T_UINT, SMP_USE_INTRN, },
{ "nbsrv", smp_fetch_nbsrv, ARG1(1,BE), NULL, SMP_T_UINT, SMP_USE_INTRN, },
{ "queue", smp_fetch_queue_size, ARG1(1,BE), NULL, SMP_T_UINT, SMP_USE_INTRN, },
{ "srv_conn", smp_fetch_srv_conn, ARG1(1,SRV), NULL, SMP_T_UINT, SMP_USE_INTRN, },
{ "srv_id", smp_fetch_srv_id, 0, NULL, SMP_T_UINT, SMP_USE_SERVR, },
{ "srv_is_up", smp_fetch_srv_is_up, ARG1(1,SRV), NULL, SMP_T_BOOL, SMP_USE_INTRN, },
{ "srv_sess_rate", smp_fetch_srv_sess_rate, ARG1(1,SRV), NULL, SMP_T_UINT, SMP_USE_INTRN, },
{ /* END */ },
}};
/* Note: must not be declared <const> as its list will be overwritten.
* Please take care of keeping this list alphabetically sorted.
*/
static struct acl_kw_list acl_kws = {{ },{
{ "avg_queue", acl_parse_int, acl_fetch_avg_queue_size, acl_match_int, ACL_USE_NOTHING, ARG1(1,BE) },
{ "be_conn", acl_parse_int, acl_fetch_be_conn, acl_match_int, ACL_USE_NOTHING, ARG1(1,BE) },
{ "be_id", acl_parse_int, acl_fetch_be_id, acl_match_int, ACL_USE_NOTHING, 0 },
{ "be_sess_rate", acl_parse_int, acl_fetch_be_sess_rate, acl_match_int, ACL_USE_NOTHING, ARG1(1,BE) },
{ "connslots", acl_parse_int, acl_fetch_connslots, acl_match_int, ACL_USE_NOTHING, ARG1(1,BE) },
{ "nbsrv", acl_parse_int, acl_fetch_nbsrv, acl_match_int, ACL_USE_NOTHING, ARG1(1,BE) },
{ "queue", acl_parse_int, acl_fetch_queue_size, acl_match_int, ACL_USE_NOTHING, ARG1(1,BE) },
{ "srv_conn", acl_parse_int, acl_fetch_srv_conn, acl_match_int, ACL_USE_NOTHING, ARG1(1,SRV) },
{ "srv_id", acl_parse_int, acl_fetch_srv_id, acl_match_int, ACL_USE_RTR_INTERNAL, 0 },
{ "srv_is_up", acl_parse_nothing, acl_fetch_srv_is_up, acl_match_nothing, ACL_USE_NOTHING, ARG1(1,SRV) },
{ "srv_sess_rate", acl_parse_int, acl_fetch_srv_sess_rate, acl_match_int, ACL_USE_NOTHING, ARG1(1,SRV) },
{ NULL, NULL, NULL, NULL },
{ "avg_queue", acl_parse_int, smp_fetch_avg_queue_size, acl_match_int, ACL_USE_NOTHING, ARG1(1,BE) },
{ "be_conn", acl_parse_int, smp_fetch_be_conn, acl_match_int, ACL_USE_NOTHING, ARG1(1,BE) },
{ "be_id", acl_parse_int, smp_fetch_be_id, acl_match_int, ACL_USE_NOTHING, 0 },
{ "be_sess_rate", acl_parse_int, smp_fetch_be_sess_rate, acl_match_int, ACL_USE_NOTHING, ARG1(1,BE) },
{ "connslots", acl_parse_int, smp_fetch_connslots, acl_match_int, ACL_USE_NOTHING, ARG1(1,BE) },
{ "nbsrv", acl_parse_int, smp_fetch_nbsrv, acl_match_int, ACL_USE_NOTHING, ARG1(1,BE) },
{ "queue", acl_parse_int, smp_fetch_queue_size, acl_match_int, ACL_USE_NOTHING, ARG1(1,BE) },
{ "srv_conn", acl_parse_int, smp_fetch_srv_conn, acl_match_int, ACL_USE_NOTHING, ARG1(1,SRV) },
{ "srv_id", acl_parse_int, smp_fetch_srv_id, acl_match_int, ACL_USE_RTR_INTERNAL, 0 },
{ "srv_is_up", acl_parse_nothing, smp_fetch_srv_is_up, acl_match_nothing, ACL_USE_NOTHING, ARG1(1,SRV) },
{ "srv_sess_rate", acl_parse_int, smp_fetch_srv_sess_rate, acl_match_int, ACL_USE_NOTHING, ARG1(1,SRV) },
{ /* END */ },
}};
__attribute__((constructor))
static void __backend_init(void)
{
sample_register_fetches(&smp_kws);
acl_register_keywords(&acl_kws);
}