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ff4491726f
Under certain circumstances, if a stream's task is first woken up (eg: I/O event) then notified of the availability of a buffer it was waiting for via stream_res_wakeup(), this second event is lost because the flags are only merged after seeing that the task is running. At the moment it seems that the TASK_WOKEN_RES event is not explicitly checked for, but better fix this before getting reports of lost events. This fix removes this "task running" test which is properly performed in task_wakeup(), while the flags are properly merged. It must be backported to 1.7 and 1.6.
305 lines
9.1 KiB
C
305 lines
9.1 KiB
C
/*
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* include/proto/stream.h
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* This file defines everything related to streams.
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*
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* Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _PROTO_STREAM_H
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#define _PROTO_STREAM_H
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#include <common/config.h>
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#include <common/memory.h>
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#include <types/stream.h>
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#include <proto/fd.h>
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#include <proto/freq_ctr.h>
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#include <proto/stick_table.h>
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#include <proto/task.h>
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extern struct pool_head *pool2_stream;
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extern struct list streams;
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extern struct data_cb sess_conn_cb;
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struct stream *stream_new(struct session *sess, struct task *t, enum obj_type *origin);
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/* perform minimal intializations, report 0 in case of error, 1 if OK. */
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int init_stream();
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/* kill a stream and set the termination flags to <why> (one of SF_ERR_*) */
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void stream_shutdown(struct stream *stream, int why);
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void stream_process_counters(struct stream *s);
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void sess_change_server(struct stream *sess, struct server *newsrv);
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struct task *process_stream(struct task *t);
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void default_srv_error(struct stream *s, struct stream_interface *si);
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int parse_track_counters(char **args, int *arg,
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int section_type, struct proxy *curpx,
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struct track_ctr_prm *prm,
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struct proxy *defpx, char **err);
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/* Update the stream's backend and server time stats */
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void stream_update_time_stats(struct stream *s);
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void stream_release_buffers(struct stream *s);
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/* returns the session this stream belongs to */
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static inline struct session *strm_sess(const struct stream *strm)
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{
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return strm->sess;
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}
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/* returns the frontend this stream was initiated from */
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static inline struct proxy *strm_fe(const struct stream *strm)
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{
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return strm->sess->fe;
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}
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/* returns the listener this stream was initiated from */
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static inline struct listener *strm_li(const struct stream *strm)
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{
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return strm->sess->listener;
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}
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/* returns a pointer to the origin of the session which created this stream */
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static inline enum obj_type *strm_orig(const struct stream *strm)
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{
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return strm->sess->origin;
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}
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/* Remove the refcount from the stream to the tracked counters, and clear the
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* pointer to ensure this is only performed once. The caller is responsible for
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* ensuring that the pointer is valid first. We must be extremely careful not
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* to touch the entries we inherited from the session.
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*/
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static inline void stream_store_counters(struct stream *s)
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{
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void *ptr;
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int i;
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for (i = 0; i < MAX_SESS_STKCTR; i++) {
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if (!stkctr_entry(&s->stkctr[i]))
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continue;
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if (stkctr_entry(&s->sess->stkctr[i]))
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continue;
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ptr = stktable_data_ptr(s->stkctr[i].table, stkctr_entry(&s->stkctr[i]), STKTABLE_DT_CONN_CUR);
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if (ptr)
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stktable_data_cast(ptr, conn_cur)--;
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stkctr_entry(&s->stkctr[i])->ref_cnt--;
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stksess_kill_if_expired(s->stkctr[i].table, stkctr_entry(&s->stkctr[i]));
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stkctr_set_entry(&s->stkctr[i], NULL);
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}
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}
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/* Remove the refcount from the stream counters tracked at the content level if
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* any, and clear the pointer to ensure this is only performed once. The caller
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* is responsible for ensuring that the pointer is valid first. We must be
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* extremely careful not to touch the entries we inherited from the session.
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*/
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static inline void stream_stop_content_counters(struct stream *s)
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{
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void *ptr;
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int i;
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for (i = 0; i < MAX_SESS_STKCTR; i++) {
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if (!stkctr_entry(&s->stkctr[i]))
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continue;
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if (stkctr_entry(&s->sess->stkctr[i]))
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continue;
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if (!(stkctr_flags(&s->stkctr[i]) & STKCTR_TRACK_CONTENT))
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continue;
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ptr = stktable_data_ptr(s->stkctr[i].table, stkctr_entry(&s->stkctr[i]), STKTABLE_DT_CONN_CUR);
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if (ptr)
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stktable_data_cast(ptr, conn_cur)--;
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stkctr_entry(&s->stkctr[i])->ref_cnt--;
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stksess_kill_if_expired(s->stkctr[i].table, stkctr_entry(&s->stkctr[i]));
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stkctr_set_entry(&s->stkctr[i], NULL);
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}
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}
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/* Increase total and concurrent connection count for stick entry <ts> of table
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* <t>. The caller is responsible for ensuring that <t> and <ts> are valid
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* pointers, and for calling this only once per connection.
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*/
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static inline void stream_start_counters(struct stktable *t, struct stksess *ts)
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{
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void *ptr;
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ptr = stktable_data_ptr(t, ts, STKTABLE_DT_CONN_CUR);
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if (ptr)
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stktable_data_cast(ptr, conn_cur)++;
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ptr = stktable_data_ptr(t, ts, STKTABLE_DT_CONN_CNT);
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if (ptr)
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stktable_data_cast(ptr, conn_cnt)++;
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ptr = stktable_data_ptr(t, ts, STKTABLE_DT_CONN_RATE);
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if (ptr)
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update_freq_ctr_period(&stktable_data_cast(ptr, conn_rate),
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t->data_arg[STKTABLE_DT_CONN_RATE].u, 1);
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if (tick_isset(t->expire))
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ts->expire = tick_add(now_ms, MS_TO_TICKS(t->expire));
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}
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/* Enable tracking of stream counters as <stkctr> on stksess <ts>. The caller is
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* responsible for ensuring that <t> and <ts> are valid pointers. Some controls
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* are performed to ensure the state can still change.
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*/
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static inline void stream_track_stkctr(struct stkctr *ctr, struct stktable *t, struct stksess *ts)
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{
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if (stkctr_entry(ctr))
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return;
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ts->ref_cnt++;
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ctr->table = t;
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stkctr_set_entry(ctr, ts);
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stream_start_counters(t, ts);
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}
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/* Increase the number of cumulated HTTP requests in the tracked counters */
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static void inline stream_inc_http_req_ctr(struct stream *s)
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{
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void *ptr;
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int i;
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for (i = 0; i < MAX_SESS_STKCTR; i++) {
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struct stkctr *stkctr = &s->stkctr[i];
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if (!stkctr_entry(stkctr)) {
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stkctr = &s->sess->stkctr[i];
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if (!stkctr_entry(stkctr))
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continue;
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}
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ptr = stktable_data_ptr(stkctr->table, stkctr_entry(stkctr), STKTABLE_DT_HTTP_REQ_CNT);
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if (ptr)
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stktable_data_cast(ptr, http_req_cnt)++;
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ptr = stktable_data_ptr(stkctr->table, stkctr_entry(stkctr), STKTABLE_DT_HTTP_REQ_RATE);
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if (ptr)
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update_freq_ctr_period(&stktable_data_cast(ptr, http_req_rate),
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stkctr->table->data_arg[STKTABLE_DT_HTTP_REQ_RATE].u, 1);
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}
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}
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/* Increase the number of cumulated HTTP requests in the backend's tracked
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* counters. We don't look up the session since it cannot happen in the bakcend.
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*/
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static void inline stream_inc_be_http_req_ctr(struct stream *s)
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{
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void *ptr;
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int i;
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for (i = 0; i < MAX_SESS_STKCTR; i++) {
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struct stkctr *stkctr = &s->stkctr[i];
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if (!stkctr_entry(stkctr))
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continue;
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if (!(stkctr_flags(&s->stkctr[i]) & STKCTR_TRACK_BACKEND))
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continue;
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ptr = stktable_data_ptr(stkctr->table, stkctr_entry(stkctr), STKTABLE_DT_HTTP_REQ_CNT);
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if (ptr)
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stktable_data_cast(ptr, http_req_cnt)++;
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ptr = stktable_data_ptr(stkctr->table, stkctr_entry(stkctr), STKTABLE_DT_HTTP_REQ_RATE);
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if (ptr)
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update_freq_ctr_period(&stktable_data_cast(ptr, http_req_rate),
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stkctr->table->data_arg[STKTABLE_DT_HTTP_REQ_RATE].u, 1);
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}
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}
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/* Increase the number of cumulated failed HTTP requests in the tracked
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* counters. Only 4xx requests should be counted here so that we can
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* distinguish between errors caused by client behaviour and other ones.
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* Note that even 404 are interesting because they're generally caused by
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* vulnerability scans.
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*/
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static void inline stream_inc_http_err_ctr(struct stream *s)
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{
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void *ptr;
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int i;
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for (i = 0; i < MAX_SESS_STKCTR; i++) {
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struct stkctr *stkctr = &s->stkctr[i];
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if (!stkctr_entry(stkctr)) {
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stkctr = &s->sess->stkctr[i];
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if (!stkctr_entry(stkctr))
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continue;
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}
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ptr = stktable_data_ptr(stkctr->table, stkctr_entry(stkctr), STKTABLE_DT_HTTP_ERR_CNT);
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if (ptr)
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stktable_data_cast(ptr, http_err_cnt)++;
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ptr = stktable_data_ptr(stkctr->table, stkctr_entry(stkctr), STKTABLE_DT_HTTP_ERR_RATE);
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if (ptr)
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update_freq_ctr_period(&stktable_data_cast(ptr, http_err_rate),
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stkctr->table->data_arg[STKTABLE_DT_HTTP_ERR_RATE].u, 1);
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}
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}
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static void inline stream_add_srv_conn(struct stream *sess, struct server *srv)
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{
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sess->srv_conn = srv;
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LIST_ADD(&srv->actconns, &sess->by_srv);
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}
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static void inline stream_del_srv_conn(struct stream *sess)
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{
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if (!sess->srv_conn)
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return;
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sess->srv_conn = NULL;
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LIST_DEL(&sess->by_srv);
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}
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static void inline stream_init_srv_conn(struct stream *sess)
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{
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sess->srv_conn = NULL;
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LIST_INIT(&sess->by_srv);
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}
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/* Callback used to wake up a stream when a buffer is available. The stream <s>
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* is woken up is if it is not already running and if it is not already in the
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* task run queue. This functions returns 1 is the stream is woken up, otherwise
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* it returns 0. */
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static int inline stream_res_wakeup(struct stream *s)
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{
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if (s->task->state & TASK_RUNNING)
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return 0;
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task_wakeup(s->task, TASK_WOKEN_RES);
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return 1;
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}
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void service_keywords_register(struct action_kw_list *kw_list);
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#endif /* _PROTO_STREAM_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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