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[MEDIUM] continue layering cleanups.

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The server sessions are now only decremented when entering SI_ST_CER
and SI_ST_CLO states. A state is clearly missing between EST and CLO,
or after CLO (eg: END), because many cleanups are performed upon CLO
and must rely on tricks to ensure being done only once.

The goal of next changes will be to improve what has been started.
Ideally, the FD should only notify the SI about the change, which
should itself only notify the session when it has some news or when
it needs help (eg: redispatch). The buffer's error processing should
not change the FD's status immediately, otherwise we risk race conds
between a pending connect and a shutw (for instance). Also, the new
connect attempt should only be made after layer 7 and all the crap
above buffers.
This commit is contained in:
Willy Tarreau 2008-11-12 01:51:41 +01:00
parent 1e62de615b
commit 4351b3a4ca
1 changed files with 51 additions and 27 deletions
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78
src/proto_http.c
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@ -208,6 +208,7 @@ fd_set url_encode_map[(sizeof(fd_set) > (256/8)) ? 1 : ((256/8) / sizeof(fd_set)
int sess_update_st_con_tcp(struct session *s, struct stream_interface *si);
int sess_update_st_cer(struct session *s, struct stream_interface *si);
void sess_establish(struct session *s, struct stream_interface *si);
void init_proto_http()
{
@ -947,14 +948,11 @@ void process_session(struct task *t, int *next)
// s->si[0].state, s->si[1].state, s->si[1].err_type, s->req->flags, s->rep->flags);
/* 1a: Check for low level timeouts if needed. We just set a flag on
* buffers and/or stream interfaces when their timeouts have expired.
* stream interfaces when their timeouts have expired.
*/
if (unlikely(t->state & TASK_WOKEN_TIMER)) {
stream_int_check_timeouts(&s->si[0]);
stream_int_check_timeouts(&s->si[1]);
buffer_check_timeouts(s->req);
buffer_check_timeouts(s->rep);
}
/* 1b: check for low-level errors reported at the stream interface.
@ -976,6 +974,7 @@ void process_session(struct task *t, int *next)
s->si[1].state = SI_ST_CLO;
fd_delete(s->si[1].fd);
stream_int_report_error(&s->si[1]);
/////////// FIXME: the following must move somewhere else
s->be->failed_resp++;
if (s->srv)
s->srv->failed_resp++;
@ -983,11 +982,12 @@ void process_session(struct task *t, int *next)
}
else if (s->si[1].state != SI_ST_INI && s->si[1].state != SI_ST_CLO) {
/* Maybe we were trying to establish a connection on the server side ? */
if (s->si[1].state == SI_ST_CON)
sess_update_st_con_tcp(s, &s->si[1]);
if (s->si[1].state == SI_ST_CER)
sess_update_st_cer(s, &s->si[1]);
if (s->si[1].state == SI_ST_CON) {
if (unlikely(!sess_update_st_con_tcp(s, &s->si[1])))
sess_update_st_cer(s, &s->si[1]);
else if (s->si[1].state == SI_ST_EST)
sess_establish(s, &s->si[1]);
}
/* now try to complete any initiated connection setup */
if (s->si[1].state >= SI_ST_REQ && s->si[1].state < SI_ST_CON) {
@ -999,6 +999,7 @@ void process_session(struct task *t, int *next)
if (s->si[1].state == SI_ST_REQ)
sess_prepare_conn_req(s, &s->si[1]);
///// FIXME: redirect should be handled later
if (s->si[1].state == SI_ST_ASS && s->srv &&
s->srv->rdr_len && (s->flags & SN_REDIRECTABLE))
perform_http_redirect(s, &s->si[1]);
@ -1007,12 +1008,21 @@ void process_session(struct task *t, int *next)
}
}
/* FIXME: we might have got an error above, and we should process them below */
/////// FIXME: do that later
/* FIXME: we might have got errors above, and we should process them below */
if (s->si[1].state == SI_ST_CLO && s->si[1].prev_state != SI_ST_CLO &&
s->si[1].err_type != SI_ET_NONE)
return_srv_error(s, s->si[1].err_type);
/* 1a: Check for low level timeouts if needed. We just set a flag on
* buffers and/or stream interfaces when their timeouts have expired.
*/
if (unlikely(t->state & TASK_WOKEN_TIMER)) {
buffer_check_timeouts(s->req);
buffer_check_timeouts(s->rep);
}
/* 1c: Manage buffer timeouts. */
if (unlikely(s->req->flags & (BF_READ_TIMEOUT|BF_WRITE_TIMEOUT))) {
if (s->req->flags & BF_READ_TIMEOUT) {
@ -1154,9 +1164,11 @@ void process_session(struct task *t, int *next)
* count it and check for pending connections on this server.
*/
if (s->req->cons->state == SI_ST_CLO) {
if (s->srv && (s->flags & SN_CURR_SESS)) {
s->flags &= ~SN_CURR_SESS;
s->srv->cur_sess--;
if (s->srv) {
if (s->flags & SN_CURR_SESS) {
s->flags &= ~SN_CURR_SESS;
s->srv->cur_sess--;
}
sess_change_server(s, NULL);
if (may_dequeue_tasks(s->srv, s->be))
process_srv_queue(s->srv);
@ -3736,16 +3748,10 @@ int sess_update_st_con_tcp(struct session *s, struct stream_interface *si)
si->state = SI_ST_CER;
fd_delete(si->fd);
if (s->srv && (s->flags & SN_CURR_SESS)) {
s->flags &= ~SN_CURR_SESS;
s->srv->cur_sess--;
sess_change_server(s, NULL);
si->err_loc = s->srv;
}
if (si->err_type)
return 0;
si->err_loc = s->srv;
if (si->flags & SI_FL_ERR)
si->err_type = SI_ET_CONN_ERR;
else
@ -3762,11 +3768,6 @@ int sess_update_st_con_tcp(struct session *s, struct stream_interface *si)
/* give up */
req->wex = TICK_ETERNITY;
fd_delete(si->fd);
if (s->srv && (s->flags & SN_CURR_SESS)) {
s->flags &= ~SN_CURR_SESS;
s->srv->cur_sess--;
sess_change_server(s, NULL);
}
buffer_shutw(req);
buffer_shutr(rep);
si->state = SI_ST_CLO;
@ -3779,11 +3780,26 @@ int sess_update_st_con_tcp(struct session *s, struct stream_interface *si)
if (!(req->flags & BF_WRITE_ACTIVITY))
return 1;
/* OK, this means that a connection succeeded */
/* OK, this means that a connection succeeded. The caller will be
* responsible for handling the transition from CON to EST.
*/
s->logs.t_connect = tv_ms_elapsed(&s->logs.tv_accept, &now);
si->state = SI_ST_EST;
si->err_type = SI_ET_NONE;
si->err_loc = NULL;
return 1;
}
/*
* This function handles the transition between the SI_ST_CON state and the
* SI_ST_EST state. It must only be called after switching from SI_ST_CON to
* SI_ST_EST.
*/
void sess_establish(struct session *s, struct stream_interface *si)
{
struct buffer *req = si->ob;
struct buffer *rep = si->ib;
if (req->flags & BF_EMPTY) {
EV_FD_CLR(si->fd, DIR_WR);
@ -3830,7 +3846,6 @@ int sess_update_st_con_tcp(struct session *s, struct stream_interface *si)
rep->flags |= BF_READ_ATTACHED; /* producer is now attached */
req->wex = TICK_ETERNITY;
return 1;
}
@ -3845,6 +3860,15 @@ int sess_update_st_con_tcp(struct session *s, struct stream_interface *si)
*/
int sess_update_st_cer(struct session *s, struct stream_interface *si)
{
/* we probably have to release last session from the server */
if (s->srv) {
if (s->flags & SN_CURR_SESS) {
s->flags &= ~SN_CURR_SESS;
s->srv->cur_sess--;
}
sess_change_server(s, NULL);
}
/* ensure that we have enough retries left */
s->conn_retries--;
if (s->conn_retries < 0) {