struct vbe_conn *
VBE_GetVbe(struct sess *sp, struct backend *bp)
{
struct vbe_conn *vc;
CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
CHECK_OBJ_NOTNULL(bp, BACKEND_MAGIC);
/* first look for vbe_conn's we can recycle */
while (1) {
Lck_Lock(&bp->mtx);
vc = VTAILQ_FIRST(&bp->connlist);
if (vc != NULL) {
bp->refcount++;
assert(vc->backend == bp);
assert(vc->fd >= 0);
VTAILQ_REMOVE(&bp->connlist, vc, list);
}
Lck_Unlock(&bp->mtx);
if (vc == NULL)
break;
if (VBE_CheckFd(vc->fd)) {
/* XXX locking of stats */
VSL_stats->backend_reuse += 1;
VSL_stats->backend_conn++;
WSP(sp, SLT_Backend, "%d %s %s",
vc->fd, sp->director->vcl_name, bp->vcl_name);
return (vc);
}
sp->vbe = vc;
VBE_ClosedFd(sp);
}
if (!bp->healthy) {
VSL_stats->backend_unhealthy++;
return (NULL);
}
if (bp->max_conn > 0 && bp->n_conn >= bp->max_conn) {
VSL_stats->backend_busy++;
return (NULL);
}
vc = VBE_NewConn();
assert(vc->fd == -1);
AZ(vc->backend);
vc->fd = bes_conn_try(sp, bp);
if (vc->fd < 0) {
VBE_ReleaseConn(vc);
VSL_stats->backend_fail++;
return (NULL);
}
vc->backend = bp;
VSL_stats->backend_conn++;
WSP(sp, SLT_Backend, "%d %s %s",
vc->fd, sp->director->vcl_name, bp->vcl_name);
return (vc);
}
void
PipeSession(struct sess *sp)
{
struct vbe_conn *vc;
struct worker *w;
struct pollfd fds[2];
int i;
CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
CHECK_OBJ_NOTNULL(sp->wrk, WORKER_MAGIC);
w = sp->wrk;
sp->vbe = VBE_GetFd(NULL, sp);
if (sp->vbe == NULL)
return;
vc = sp->vbe;
(void)TCP_blocking(vc->fd);
WRW_Reserve(w, &vc->fd);
sp->acct_req.hdrbytes += http_Write(w, sp->wrk->bereq, 0);
if (sp->htc->pipeline.b != NULL)
sp->acct_req.bodybytes +=
WRW_Write(w, sp->htc->pipeline.b, Tlen(sp->htc->pipeline));
i = WRW_FlushRelease(w);
if (i) {
vca_close_session(sp, "pipe");
VBE_ClosedFd(sp);
return;
}
sp->t_resp = TIM_real();
memset(fds, 0, sizeof fds);
// XXX: not yet (void)TCP_linger(vc->fd, 0);
fds[0].fd = vc->fd;
fds[0].events = POLLIN | POLLERR;
// XXX: not yet (void)TCP_linger(sp->fd, 0);
fds[1].fd = sp->fd;
fds[1].events = POLLIN | POLLERR;
while (fds[0].fd > -1 || fds[1].fd > -1) {
fds[0].revents = 0;
fds[1].revents = 0;
i = poll(fds, 2, params->pipe_timeout * 1000);
if (i < 1)
break;
if (fds[0].revents && rdf(vc->fd, sp->fd)) {
(void)shutdown(vc->fd, SHUT_RD);
(void)shutdown(sp->fd, SHUT_WR);
fds[0].events = 0;
fds[0].fd = -1;
}
if (fds[1].revents && rdf(sp->fd, vc->fd)) {
(void)shutdown(sp->fd, SHUT_RD);
(void)shutdown(vc->fd, SHUT_WR);
fds[1].events = 0;
fds[1].fd = -1;
}
}
if (fds[0].fd >= 0) {
(void)shutdown(vc->fd, SHUT_RD);
(void)shutdown(sp->fd, SHUT_WR);
}
if (fds[1].fd >= 0) {
(void)shutdown(sp->fd, SHUT_RD);
(void)shutdown(vc->fd, SHUT_WR);
}
vca_close_session(sp, "pipe");
VBE_ClosedFd(sp);
}