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/*
* include/proto/stream.h
* This file defines everything related to streams.
*
* Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _PROTO_STREAM_H
#define _PROTO_STREAM_H
#include <common/config.h>
#include <common/memory.h>
#include <types/action.h>
#include <types/stream.h>
#include <proto/fd.h>
#include <proto/freq_ctr.h>
#include <proto/obj_type.h>
#include <proto/queue.h>
#include <proto/stick_table.h>
#include <proto/task.h>
#define IS_HTX_STRM(strm) ((strm)->flags & SF_HTX)
extern struct pool_head *pool_head_stream;
extern struct list streams;
extern struct data_cb sess_conn_cb;
struct stream *stream_new(struct session *sess, enum obj_type *origin);
int stream_create_from_cs(struct conn_stream *cs);
/* kill a stream and set the termination flags to <why> (one of SF_ERR_*) */
void stream_shutdown(struct stream *stream, int why);
void stream_dump(struct buffer *buf, const struct stream *s, const char *pfx, char eol);
void stream_dump_and_crash(enum obj_type *obj, int rate);
void stream_process_counters(struct stream *s);
void sess_change_server(struct stream *sess, struct server *newsrv);
struct task *process_stream(struct task *t, void *context, unsigned short state);
void default_srv_error(struct stream *s, struct stream_interface *si);
int parse_track_counters(char **args, int *arg,
int section_type, struct proxy *curpx,
struct track_ctr_prm *prm,
struct proxy *defpx, char **err);
/* Update the stream's backend and server time stats */
void stream_update_time_stats(struct stream *s);
void stream_release_buffers(struct stream *s);
int stream_buf_available(void *arg);
/* returns the session this stream belongs to */
static inline struct session *strm_sess(const struct stream *strm)
{
return strm->sess;
}
/* returns the frontend this stream was initiated from */
static inline struct proxy *strm_fe(const struct stream *strm)
{
return strm->sess->fe;
}
/* returns the listener this stream was initiated from */
static inline struct listener *strm_li(const struct stream *strm)
{
return strm->sess->listener;
}
/* returns a pointer to the origin of the session which created this stream */
static inline enum obj_type *strm_orig(const struct stream *strm)
{
return strm->sess->origin;
}
/* Remove the refcount from the stream to the tracked counters, and clear the
* pointer to ensure this is only performed once. The caller is responsible for
* ensuring that the pointer is valid first. We must be extremely careful not
* to touch the entries we inherited from the session.
*/
static inline void stream_store_counters(struct stream *s)
{
void *ptr;
int i;
struct stksess *ts;
for (i = 0; i < MAX_SESS_STKCTR; i++) {
ts = stkctr_entry(&s->stkctr[i]);
if (!ts)
continue;
if (stkctr_entry(&s->sess->stkctr[i]))
continue;
ptr = stktable_data_ptr(s->stkctr[i].table, ts, STKTABLE_DT_CONN_CUR);
if (ptr) {
HA_RWLOCK_WRLOCK(STK_SESS_LOCK, &ts->lock);
if (stktable_data_cast(ptr, conn_cur) > 0)
stktable_data_cast(ptr, conn_cur)--;
HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
/* If data was modified, we need to touch to re-schedule sync */
stktable_touch_local(s->stkctr[i].table, ts, 0);
}
stkctr_set_entry(&s->stkctr[i], NULL);
stksess_kill_if_expired(s->stkctr[i].table, ts, 1);
}
}
/* Remove the refcount from the stream counters tracked at the content level if
* any, and clear the pointer to ensure this is only performed once. The caller
* is responsible for ensuring that the pointer is valid first. We must be
* extremely careful not to touch the entries we inherited from the session.
*/
static inline void stream_stop_content_counters(struct stream *s)
{
struct stksess *ts;
void *ptr;
int i;
for (i = 0; i < MAX_SESS_STKCTR; i++) {
ts = stkctr_entry(&s->stkctr[i]);
if (!ts)
continue;
if (stkctr_entry(&s->sess->stkctr[i]))
continue;
if (!(stkctr_flags(&s->stkctr[i]) & STKCTR_TRACK_CONTENT))
continue;
ptr = stktable_data_ptr(s->stkctr[i].table, ts, STKTABLE_DT_CONN_CUR);
if (ptr) {
HA_RWLOCK_WRLOCK(STK_SESS_LOCK, &ts->lock);
if (stktable_data_cast(ptr, conn_cur) > 0)
stktable_data_cast(ptr, conn_cur)--;
HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
/* If data was modified, we need to touch to re-schedule sync */
stktable_touch_local(s->stkctr[i].table, ts, 0);
}
stkctr_set_entry(&s->stkctr[i], NULL);
stksess_kill_if_expired(s->stkctr[i].table, ts, 1);
}
}
/* Increase total and concurrent connection count for stick entry <ts> of table
* <t>. The caller is responsible for ensuring that <t> and <ts> are valid
* pointers, and for calling this only once per connection.
*/
static inline void stream_start_counters(struct stktable *t, struct stksess *ts)
{
void *ptr;
HA_RWLOCK_WRLOCK(STK_SESS_LOCK, &ts->lock);
ptr = stktable_data_ptr(t, ts, STKTABLE_DT_CONN_CUR);
if (ptr)
stktable_data_cast(ptr, conn_cur)++;
ptr = stktable_data_ptr(t, ts, STKTABLE_DT_CONN_CNT);
if (ptr)
stktable_data_cast(ptr, conn_cnt)++;
ptr = stktable_data_ptr(t, ts, STKTABLE_DT_CONN_RATE);
if (ptr)
update_freq_ctr_period(&stktable_data_cast(ptr, conn_rate),
t->data_arg[STKTABLE_DT_CONN_RATE].u, 1);
if (tick_isset(t->expire))
ts->expire = tick_add(now_ms, MS_TO_TICKS(t->expire));
HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
/* If data was modified, we need to touch to re-schedule sync */
stktable_touch_local(t, ts, 0);
}
/* Enable tracking of stream counters as <stkctr> on stksess <ts>. The caller is
* responsible for ensuring that <t> and <ts> are valid pointers. Some controls
* are performed to ensure the state can still change.
*/
static inline void stream_track_stkctr(struct stkctr *ctr, struct stktable *t, struct stksess *ts)
{
/* Why this test ???? */
if (stkctr_entry(ctr))
return;
ctr->table = t;
stkctr_set_entry(ctr, ts);
stream_start_counters(t, ts);
}
/* Increase the number of cumulated HTTP requests in the tracked counters */
static inline void stream_inc_http_req_ctr(struct stream *s)
{
struct stksess *ts;
void *ptr;
int i;
for (i = 0; i < MAX_SESS_STKCTR; i++) {
struct stkctr *stkctr = &s->stkctr[i];
ts = stkctr_entry(stkctr);
if (!ts) {
stkctr = &s->sess->stkctr[i];
ts = stkctr_entry(stkctr);
if (!ts)
continue;
}
HA_RWLOCK_WRLOCK(STK_SESS_LOCK, &ts->lock);
ptr = stktable_data_ptr(stkctr->table, ts, STKTABLE_DT_HTTP_REQ_CNT);
if (ptr)
stktable_data_cast(ptr, http_req_cnt)++;
ptr = stktable_data_ptr(stkctr->table, ts, STKTABLE_DT_HTTP_REQ_RATE);
if (ptr)
update_freq_ctr_period(&stktable_data_cast(ptr, http_req_rate),
stkctr->table->data_arg[STKTABLE_DT_HTTP_REQ_RATE].u, 1);
HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
/* If data was modified, we need to touch to re-schedule sync */
stktable_touch_local(stkctr->table, ts, 0);
}
}
/* Increase the number of cumulated HTTP requests in the backend's tracked
* counters. We don't look up the session since it cannot happen in the bakcend.
*/
static inline void stream_inc_be_http_req_ctr(struct stream *s)
{
struct stksess *ts;
void *ptr;
int i;
for (i = 0; i < MAX_SESS_STKCTR; i++) {
struct stkctr *stkctr = &s->stkctr[i];
ts = stkctr_entry(stkctr);
if (!ts)
continue;
if (!(stkctr_flags(&s->stkctr[i]) & STKCTR_TRACK_BACKEND))
continue;
HA_RWLOCK_WRLOCK(STK_SESS_LOCK, &ts->lock);
ptr = stktable_data_ptr(stkctr->table, ts, STKTABLE_DT_HTTP_REQ_CNT);
if (ptr)
stktable_data_cast(ptr, http_req_cnt)++;
ptr = stktable_data_ptr(stkctr->table, ts, STKTABLE_DT_HTTP_REQ_RATE);
if (ptr)
update_freq_ctr_period(&stktable_data_cast(ptr, http_req_rate),
stkctr->table->data_arg[STKTABLE_DT_HTTP_REQ_RATE].u, 1);
HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
/* If data was modified, we need to touch to re-schedule sync */
stktable_touch_local(stkctr->table, ts, 0);
}
}
/* Increase the number of cumulated failed HTTP requests in the tracked
* counters. Only 4xx requests should be counted here so that we can
* distinguish between errors caused by client behaviour and other ones.
* Note that even 404 are interesting because they're generally caused by
* vulnerability scans.
*/
static inline void stream_inc_http_err_ctr(struct stream *s)
{
struct stksess *ts;
void *ptr;
int i;
for (i = 0; i < MAX_SESS_STKCTR; i++) {
struct stkctr *stkctr = &s->stkctr[i];
ts = stkctr_entry(stkctr);
if (!ts) {
stkctr = &s->sess->stkctr[i];
ts = stkctr_entry(stkctr);
if (!ts)
continue;
}
HA_RWLOCK_WRLOCK(STK_SESS_LOCK, &ts->lock);
ptr = stktable_data_ptr(stkctr->table, ts, STKTABLE_DT_HTTP_ERR_CNT);
if (ptr)
stktable_data_cast(ptr, http_err_cnt)++;
ptr = stktable_data_ptr(stkctr->table, ts, STKTABLE_DT_HTTP_ERR_RATE);
if (ptr)
update_freq_ctr_period(&stktable_data_cast(ptr, http_err_rate),
stkctr->table->data_arg[STKTABLE_DT_HTTP_ERR_RATE].u, 1);
HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
/* If data was modified, we need to touch to re-schedule sync */
stktable_touch_local(stkctr->table, ts, 0);
}
}
static inline void __stream_add_srv_conn(struct stream *sess, struct server *srv)
{
sess->srv_conn = srv;
LIST_ADD(&srv->actconns, &sess->by_srv);
}
static inline void stream_add_srv_conn(struct stream *sess, struct server *srv)
{
HA_SPIN_LOCK(SERVER_LOCK, &srv->lock);
__stream_add_srv_conn(sess, srv);
HA_SPIN_UNLOCK(SERVER_LOCK, &srv->lock);
}
static inline void stream_del_srv_conn(struct stream *sess)
{
struct server *srv = sess->srv_conn;
if (!srv)
return;
HA_SPIN_LOCK(SERVER_LOCK, &srv->lock);
sess->srv_conn = NULL;
LIST_DEL(&sess->by_srv);
HA_SPIN_UNLOCK(SERVER_LOCK, &srv->lock);
}
static inline void stream_init_srv_conn(struct stream *sess)
{
sess->srv_conn = NULL;
LIST_INIT(&sess->by_srv);
}
static inline void stream_choose_redispatch(struct stream *s)
{
struct stream_interface *si = &s->si[1];
/* If the "redispatch" option is set on the backend, we are allowed to
* retry on another server. By default this redispatch occurs on the
* last retry, but if configured we allow redispatches to occur on
* configurable intervals, e.g. on every retry. In order to achieve this,
* we must mark the stream unassigned, and eventually clear the DIRECT
* bit to ignore any persistence cookie. We won't count a retry nor a
* redispatch yet, because this will depend on what server is selected.
* If the connection is not persistent, the balancing algorithm is not
* determinist (round robin) and there is more than one active server,
* we accept to perform an immediate redispatch without waiting since
* we don't care about this particular server.
*/
if (objt_server(s->target) &&
(s->be->options & PR_O_REDISP) && !(s->flags & SF_FORCE_PRST) &&
((__objt_server(s->target)->cur_state < SRV_ST_RUNNING) ||
(((s->be->redispatch_after > 0) &&
((s->be->conn_retries - si->conn_retries) %
s->be->redispatch_after == 0)) ||
((s->be->redispatch_after < 0) &&
((s->be->conn_retries - si->conn_retries) %
(s->be->conn_retries + 1 + s->be->redispatch_after) == 0))) ||
(!(s->flags & SF_DIRECT) && s->be->srv_act > 1 &&
((s->be->lbprm.algo & BE_LB_KIND) == BE_LB_KIND_RR)))) {
sess_change_server(s, NULL);
if (may_dequeue_tasks(objt_server(s->target), s->be))
process_srv_queue(objt_server(s->target));
s->flags &= ~(SF_DIRECT | SF_ASSIGNED | SF_ADDR_SET);
si->state = SI_ST_REQ;
} else {
if (objt_server(s->target))
_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.retries, 1);
_HA_ATOMIC_ADD(&s->be->be_counters.retries, 1);
si->state = SI_ST_ASS;
}
}
void service_keywords_register(struct action_kw_list *kw_list);
struct action_kw *service_find(const char *kw);
void list_services(FILE *out);
#endif /* _PROTO_STREAM_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/