view src/event/ngx_event_posted.c @ 8085:043006e5a0b1

SSL: optimized rotation of session ticket keys. Instead of syncing keys with shared memory on each ticket operation, the code now does this only when the worker is going to change expiration of the current key, or going to switch to a new key: that is, usually at most once per second. To do so without races, the code maintains 3 keys: current, previous, and next. If a worker will switch to the next key earlier, other workers will still be able to decrypt new tickets, since they will be encrypted with the next key.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 12 Oct 2022 20:14:55 +0300
parents f1720934c45b
children
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>


ngx_queue_t  ngx_posted_accept_events;
ngx_queue_t  ngx_posted_next_events;
ngx_queue_t  ngx_posted_events;


void
ngx_event_process_posted(ngx_cycle_t *cycle, ngx_queue_t *posted)
{
    ngx_queue_t  *q;
    ngx_event_t  *ev;

    while (!ngx_queue_empty(posted)) {

        q = ngx_queue_head(posted);
        ev = ngx_queue_data(q, ngx_event_t, queue);

        ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
                      "posted event %p", ev);

        ngx_delete_posted_event(ev);

        ev->handler(ev);
    }
}


void
ngx_event_move_posted_next(ngx_cycle_t *cycle)
{
    ngx_queue_t  *q;
    ngx_event_t  *ev;

    for (q = ngx_queue_head(&ngx_posted_next_events);
         q != ngx_queue_sentinel(&ngx_posted_next_events);
         q = ngx_queue_next(q))
    {
        ev = ngx_queue_data(q, ngx_event_t, queue);

        ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
                      "posted next event %p", ev);

        ev->ready = 1;
        ev->available = -1;
    }

    ngx_queue_add(&ngx_posted_events, &ngx_posted_next_events);
    ngx_queue_init(&ngx_posted_next_events);
}