blob: 7d1ec289b00da03740224501355480585e823d64 [file] [log] [blame]
/*
* Functions managing applets
*
* Copyright 2000-2015 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <haproxy/api.h>
#include <haproxy/applet.h>
#include <haproxy/channel.h>
#include <haproxy/list.h>
#include <haproxy/stream.h>
#include <haproxy/stream_interface.h>
#include <haproxy/task.h>
unsigned int nb_applets = 0;
DECLARE_POOL(pool_head_appctx, "appctx", sizeof(struct appctx));
/* Callback used to wake up an applet when a buffer is available. The applet
* <appctx> is woken up if an input buffer was requested for the associated
* stream interface. In this case the buffer is immediately allocated and the
* function returns 1. Otherwise it returns 0. Note that this automatically
* covers multiple wake-up attempts by ensuring that the same buffer will not
* be accounted for multiple times.
*/
int appctx_buf_available(void *arg)
{
struct appctx *appctx = arg;
struct stream_interface *si = appctx->owner;
/* allocation requested ? */
if (!(si->flags & SI_FL_RXBLK_BUFF))
return 0;
si_rx_buff_rdy(si);
/* was already allocated another way ? if so, don't take this one */
if (c_size(si_ic(si)) || si_ic(si)->pipe)
return 0;
/* allocation possible now ? */
if (!b_alloc(&si_ic(si)->buf)) {
si_rx_buff_blk(si);
return 0;
}
task_wakeup(appctx->t, TASK_WOKEN_RES);
return 1;
}
/* Default applet handler */
struct task *task_run_applet(struct task *t, void *context, unsigned int state)
{
struct appctx *app = context;
struct stream_interface *si = app->owner;
unsigned int rate;
size_t count;
if (app->state & APPLET_WANT_DIE) {
__appctx_free(app);
return NULL;
}
/* We always pretend the applet can't get and doesn't want to
* put, it's up to it to change this if needed. This ensures
* that one applet which ignores any event will not spin.
*/
si_cant_get(si);
si_rx_endp_done(si);
/* Now we'll try to allocate the input buffer. We wake up the applet in
* all cases. So this is the applet's responsibility to check if this
* buffer was allocated or not. This leaves a chance for applets to do
* some other processing if needed. The applet doesn't have anything to
* do if it needs the buffer, it will be called again upon readiness.
*/
if (!si_alloc_ibuf(si, &app->buffer_wait))
si_rx_endp_more(si);
count = co_data(si_oc(si));
app->applet->fct(app);
/* now check if the applet has released some room and forgot to
* notify the other side about it.
*/
if (count != co_data(si_oc(si))) {
si_oc(si)->flags |= CF_WRITE_PARTIAL | CF_WROTE_DATA;
si_rx_room_rdy(si_opposite(si));
}
/* measure the call rate and check for anomalies when too high */
rate = update_freq_ctr(&app->call_rate, 1);
if (rate >= 100000 && app->call_rate.prev_ctr && // looped more than 100k times over last second
((b_size(si_ib(si)) && si->flags & SI_FL_RXBLK_BUFF) || // asks for a buffer which is present
(b_size(si_ib(si)) && !b_data(si_ib(si)) && si->flags & SI_FL_RXBLK_ROOM) || // asks for room in an empty buffer
(b_data(si_ob(si)) && si_tx_endp_ready(si) && !si_tx_blocked(si)) || // asks for data already present
(!b_data(si_ib(si)) && b_data(si_ob(si)) && // didn't return anything ...
(si_oc(si)->flags & (CF_WRITE_PARTIAL|CF_SHUTW_NOW)) == CF_SHUTW_NOW))) { // ... and left data pending after a shut
stream_dump_and_crash(&app->obj_type, read_freq_ctr(&app->call_rate));
}
si_applet_wake_cb(si);
channel_release_buffer(si_ic(si), &app->buffer_wait);
return t;
}