/* Callback to be used by connection I/O handlers upon completion. It propagates
* connection flags to the stream interface, updates the stream (which may or
* may not take this opportunity to try to forward data), then update the
* connection's polling based on the channels and stream interface's final
* states. The function always returns 0.
*/
static int si_conn_wake_cb(struct connection *conn)
{
struct stream_interface *si = conn->owner;
struct channel *ic = si_ic(si);
struct channel *oc = si_oc(si);
/* First step, report to the stream-int what was detected at the
* connection layer : errors and connection establishment.
*/
if (conn->flags & CO_FL_ERROR)
si->flags |= SI_FL_ERR;
if (unlikely(!(conn->flags & (CO_FL_WAIT_L4_CONN | CO_FL_WAIT_L6_CONN | CO_FL_CONNECTED)))) {
si->exp = TICK_ETERNITY;
oc->flags |= CF_WRITE_NULL;
}
/* Second step : update the stream-int and channels, try to forward any
* pending data, then possibly wake the stream up based on the new
* stream-int status.
*/
stream_int_notify(si);
/* Third step : update the connection's polling status based on what
* was done above (eg: maybe some buffers got emptied).
*/
if (channel_is_empty(oc))
__conn_data_stop_send(conn);
if (si->flags & SI_FL_WAIT_ROOM) {
__conn_data_stop_recv(conn);
}
else if ((ic->flags & (CF_SHUTR|CF_READ_PARTIAL|CF_DONT_READ)) == CF_READ_PARTIAL &&
channel_may_recv(ic)) {
__conn_data_want_recv(conn);
}
return 0;
}
/* This function is used for inter-stream-interface calls. It is called by the
* consumer to inform the producer side that it may be interested in checking
* for free space in the buffer. Note that it intentionally does not update
* timeouts, so that we can still check them later at wake-up. This function is
* dedicated to connection-based stream interfaces.
*/
static void stream_int_chk_rcv_conn(struct stream_interface *si)
{
struct channel *ib = si->ib;
if (unlikely(si->state > SI_ST_EST || (ib->flags & CF_SHUTR)))
return;
conn_refresh_polling_flags(si->conn);
if ((ib->flags & CF_DONT_READ) || channel_full(ib)) {
/* stop reading */
if (!(ib->flags & CF_DONT_READ)) /* full */
si->flags |= SI_FL_WAIT_ROOM;
__conn_data_stop_recv(si->conn);
}
else {
/* (re)start reading */
si->flags &= ~SI_FL_WAIT_ROOM;
__conn_data_want_recv(si->conn);
}
conn_cond_update_data_polling(si->conn);
}
/* This function is used for inter-stream-interface calls. It is called by the
* consumer to inform the producer side that it may be interested in checking
* for free space in the buffer. Note that it intentionally does not update
* timeouts, so that we can still check them later at wake-up. This function is
* dedicated to connection-based stream interfaces.
*/
static void stream_int_chk_rcv_conn(struct stream_interface *si)
{
struct channel *ic = si_ic(si);
struct connection *conn = __objt_conn(si->end);
if (unlikely(si->state > SI_ST_EST || (ic->flags & CF_SHUTR)))
return;
conn_refresh_polling_flags(conn);
if ((ic->flags & CF_DONT_READ) || !channel_may_recv(ic)) {
/* stop reading */
if (!(ic->flags & CF_DONT_READ)) /* full */
si->flags |= SI_FL_WAIT_ROOM;
__conn_data_stop_recv(conn);
}
else {
/* (re)start reading */
si->flags &= ~SI_FL_WAIT_ROOM;
__conn_data_want_recv(conn);
}
conn_cond_update_data_polling(conn);
}
/* Updates the polling status of a connection outside of the connection handler
* based on the channel's flags and the stream interface's flags. It needs to be
* called once after the channels' flags have settled down and the stream has
* been updated. It is not designed to be called from within the connection
* handler itself.
*/
void stream_int_update_conn(struct stream_interface *si)
{
struct channel *ic = si_ic(si);
struct channel *oc = si_oc(si);
struct connection *conn = __objt_conn(si->end);
if (!(ic->flags & CF_SHUTR)) {
/* Read not closed */
if ((ic->flags & CF_DONT_READ) || !channel_may_recv(ic))
__conn_data_stop_recv(conn);
else
__conn_data_want_recv(conn);
}
if (!(oc->flags & CF_SHUTW)) {
/* Write not closed */
if (channel_is_empty(oc))
__conn_data_stop_send(conn);
else
__conn_data_want_send(conn);
}
conn_cond_update_data_polling(conn);
}
/* Callback to be used by connection I/O handlers upon completion. It differs from
* the update function in that it is designed to be called by lower layers after I/O
* events have been completed. It will also try to wake the associated task up if
* an important event requires special handling. It relies on the connection handler
* to commit any polling updates. The function always returns 0.
*/
static int si_conn_wake_cb(struct connection *conn)
{
struct stream_interface *si = conn->owner;
DPRINTF(stderr, "%s: si=%p, si->state=%d ib->flags=%08x ob->flags=%08x\n",
__FUNCTION__,
si, si->state, si->ib->flags, si->ob->flags);
if (conn->flags & CO_FL_ERROR)
si->flags |= SI_FL_ERR;
/* check for recent connection establishment */
if (unlikely(!(conn->flags & (CO_FL_WAIT_L4_CONN | CO_FL_WAIT_L6_CONN | CO_FL_CONNECTED)))) {
si->exp = TICK_ETERNITY;
si->ob->flags |= CF_WRITE_NULL;
}
/* process consumer side */
if (channel_is_empty(si->ob)) {
if (((si->ob->flags & (CF_SHUTW|CF_SHUTW_NOW)) == CF_SHUTW_NOW) &&
(si->state == SI_ST_EST))
stream_int_shutw_conn(si);
__conn_data_stop_send(conn);
si->ob->wex = TICK_ETERNITY;
}
if ((si->ob->flags & (CF_SHUTW|CF_SHUTW_NOW)) == 0 && !channel_full(si->ob))
si->flags |= SI_FL_WAIT_DATA;
if (si->ob->flags & CF_WRITE_ACTIVITY) {
/* update timeouts if we have written something */
if ((si->ob->flags & (CF_SHUTW|CF_WRITE_PARTIAL)) == CF_WRITE_PARTIAL &&
!channel_is_empty(si->ob))
if (tick_isset(si->ob->wex))
si->ob->wex = tick_add_ifset(now_ms, si->ob->wto);
if (!(si->flags & SI_FL_INDEP_STR))
if (tick_isset(si->ib->rex))
si->ib->rex = tick_add_ifset(now_ms, si->ib->rto);
if (likely((si->ob->flags & (CF_SHUTW|CF_WRITE_PARTIAL|CF_DONT_READ)) == CF_WRITE_PARTIAL &&
!channel_full(si->ob) &&
(si->ob->prod->flags & SI_FL_WAIT_ROOM)))
si_chk_rcv(si->ob->prod);
}
/* process producer side.
* We might have some data the consumer is waiting for.
* We can do fast-forwarding, but we avoid doing this for partial
* buffers, because it is very likely that it will be done again
* immediately afterwards once the following data is parsed (eg:
* HTTP chunking).
*/
if (((si->ib->flags & CF_READ_PARTIAL) && !channel_is_empty(si->ib)) &&
(si->ib->pipe /* always try to send spliced data */ ||
(si->ib->buf->i == 0 && (si->ib->cons->flags & SI_FL_WAIT_DATA)))) {
int last_len = si->ib->pipe ? si->ib->pipe->data : 0;
si_chk_snd(si->ib->cons);
/* check if the consumer has freed some space either in the
* buffer or in the pipe.
*/
if (!channel_full(si->ib) &&
(!last_len || !si->ib->pipe || si->ib->pipe->data < last_len))
si->flags &= ~SI_FL_WAIT_ROOM;
}
if (si->flags & SI_FL_WAIT_ROOM) {
__conn_data_stop_recv(conn);
si->ib->rex = TICK_ETERNITY;
}
else if ((si->ib->flags & (CF_SHUTR|CF_READ_PARTIAL|CF_DONT_READ)) == CF_READ_PARTIAL &&
!channel_full(si->ib)) {
/* we must re-enable reading if si_chk_snd() has freed some space */
__conn_data_want_recv(conn);
if (!(si->ib->flags & CF_READ_NOEXP) && tick_isset(si->ib->rex))
si->ib->rex = tick_add_ifset(now_ms, si->ib->rto);
}
/* wake the task up only when needed */
if (/* changes on the production side */
(si->ib->flags & (CF_READ_NULL|CF_READ_ERROR)) ||
si->state != SI_ST_EST ||
(si->flags & SI_FL_ERR) ||
((si->ib->flags & CF_READ_PARTIAL) &&
(!si->ib->to_forward || si->ib->cons->state != SI_ST_EST)) ||
/* changes on the consumption side */
(si->ob->flags & (CF_WRITE_NULL|CF_WRITE_ERROR)) ||
((si->ob->flags & CF_WRITE_ACTIVITY) &&
((si->ob->flags & CF_SHUTW) ||
((si->ob->flags & CF_WAKE_WRITE) &&
(si->ob->prod->state != SI_ST_EST ||
(channel_is_empty(si->ob) && !si->ob->to_forward)))))) {
task_wakeup(si->owner, TASK_WOKEN_IO);
}
if (si->ib->flags & CF_READ_ACTIVITY)
si->ib->flags &= ~CF_READ_DONTWAIT;
return 0;
}
