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/*
* Copyright 2022-2023 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdlib.h>
#include "internal/event_queue.h"
#include "ssl_local.h"
struct ossl_event_queue_st {
PRIORITY_QUEUE_OF(OSSL_EVENT) *timed_events;
PRIORITY_QUEUE_OF(OSSL_EVENT) *now_events;
};
static int event_compare_times(const OSSL_EVENT *a, const OSSL_EVENT *b)
{
return ossl_time_compare(a->when, b->when);
}
static int event_compare_priority(const OSSL_EVENT *a, const OSSL_EVENT *b)
{
if (a->priority > b->priority)
return -1;
if (a->priority < b->priority)
return 1;
return 0;
}
OSSL_EVENT_QUEUE *ossl_event_queue_new(void)
{
OSSL_EVENT_QUEUE *r = OPENSSL_malloc(sizeof(*r));
if (r != NULL) {
r->timed_events = ossl_pqueue_OSSL_EVENT_new(&event_compare_times);
r->now_events = ossl_pqueue_OSSL_EVENT_new(&event_compare_priority);
if (r->timed_events == NULL || r->now_events == NULL) {
ossl_event_queue_free(r);
return NULL;
}
}
return r;
}
void ossl_event_free(OSSL_EVENT *event)
{
if (event != NULL) {
if (event->flag_dynamic)
OPENSSL_free(event);
else
event->queue = NULL;
}
}
static void event_queue_free(PRIORITY_QUEUE_OF(OSSL_EVENT) *queue)
{
OSSL_EVENT *e;
if (queue != NULL) {
while ((e = ossl_pqueue_OSSL_EVENT_pop(queue)) != NULL)
ossl_event_free(e);
ossl_pqueue_OSSL_EVENT_free(queue);
}
}
void ossl_event_queue_free(OSSL_EVENT_QUEUE *queue)
{
if (queue != NULL) {
event_queue_free(queue->now_events);
event_queue_free(queue->timed_events);
OPENSSL_free(queue);
}
}
static ossl_inline
int event_queue_add(OSSL_EVENT_QUEUE *queue, OSSL_EVENT *event)
{
PRIORITY_QUEUE_OF(OSSL_EVENT) *pq =
ossl_time_compare(event->when, ossl_time_now()) <= 0
? queue->now_events
: queue->timed_events;
if (ossl_pqueue_OSSL_EVENT_push(pq, event, &event->ref)) {
event->queue = pq;
return 1;
}
return 0;
}
static ossl_inline
void ossl_event_set(OSSL_EVENT *event, uint32_t type, uint32_t priority,
OSSL_TIME when, void *ctx,
void *payload, size_t payload_size)
{
event->type = type;
event->priority = priority;
event->when = when;
event->ctx = ctx;
event->payload = payload;
event->payload_size = payload_size;
}
OSSL_EVENT *ossl_event_queue_add_new(OSSL_EVENT_QUEUE *queue,
uint32_t type, uint32_t priority,
OSSL_TIME when, void *ctx,
void *payload, size_t payload_size)
{
OSSL_EVENT *e = OPENSSL_malloc(sizeof(*e));
if (e == NULL || queue == NULL) {
OPENSSL_free(e);
return NULL;
}
ossl_event_set(e, type, priority, when, ctx, payload, payload_size);
e->flag_dynamic = 1;
if (event_queue_add(queue, e))
return e;
OPENSSL_free(e);
return NULL;
}
int ossl_event_queue_add(OSSL_EVENT_QUEUE *queue, OSSL_EVENT *event,
uint32_t type, uint32_t priority,
OSSL_TIME when, void *ctx,
void *payload, size_t payload_size)
{
if (event == NULL || queue == NULL)
return 0;
ossl_event_set(event, type, priority, when, ctx, payload, payload_size);
event->flag_dynamic = 0;
return event_queue_add(queue, event);
}
int ossl_event_queue_remove(OSSL_EVENT_QUEUE *queue, OSSL_EVENT *event)
{
if (event != NULL && event->queue != NULL) {
ossl_pqueue_OSSL_EVENT_remove(event->queue, event->ref);
event->queue = NULL;
}
return 1;
}
OSSL_TIME ossl_event_time_until(const OSSL_EVENT *event)
{
if (event == NULL)
return ossl_time_infinite();
return ossl_time_subtract(event->when, ossl_time_now());
}
OSSL_TIME ossl_event_queue_time_until_next(const OSSL_EVENT_QUEUE *queue)
{
if (queue == NULL)
return ossl_time_infinite();
if (ossl_pqueue_OSSL_EVENT_num(queue->now_events) > 0)
return ossl_time_zero();
return ossl_event_time_until(ossl_pqueue_OSSL_EVENT_peek(queue->timed_events));
}
int ossl_event_queue_postpone_until(OSSL_EVENT_QUEUE *queue,
OSSL_EVENT *event,
OSSL_TIME when)
{
if (ossl_event_queue_remove(queue, event)) {
event->when = when;
return event_queue_add(queue, event);
}
return 0;
}
int ossl_event_queue_get1_next_event(OSSL_EVENT_QUEUE *queue,
OSSL_EVENT **event)
{
OSSL_TIME now = ossl_time_now();
OSSL_EVENT *e;
/* Check for expired timer based events and convert them to now events */
while ((e = ossl_pqueue_OSSL_EVENT_peek(queue->timed_events)) != NULL
&& ossl_time_compare(e->when, now) <= 0) {
e = ossl_pqueue_OSSL_EVENT_pop(queue->timed_events);
if (!ossl_pqueue_OSSL_EVENT_push(queue->now_events, e, &e->ref)) {
e->queue = NULL;
return 0;
}
}
/*
* Get next event from the now queue.
* The pop returns NULL when there is none.
*/
*event = ossl_pqueue_OSSL_EVENT_pop(queue->now_events);
return 1;
}
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