quickjs-tart

quickjs-based runtime for wallet-core logic
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psl.c (3315B)

      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
      9  *
     10  * This software is licensed as described in the file COPYING, which
     11  * you should have received as part of this distribution. The terms
     12  * are also available at https://curl.se/docs/copyright.html.
     13  *
     14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
     15  * copies of the Software, and permit persons to whom the Software is
     16  * furnished to do so, under the terms of the COPYING file.
     17  *
     18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
     19  * KIND, either express or implied.
     20  *
     21  * SPDX-License-Identifier: curl
     22  *
     23  ***************************************************************************/
     24 
     25 #include "curl_setup.h"
     26 
     27 #include <curl/curl.h>
     28 
     29 #ifdef USE_LIBPSL
     30 
     31 #include "psl.h"
     32 #include "share.h"
     33 
     34 /* The last 3 #include files should be in this order */
     35 #include "curl_printf.h"
     36 #include "curl_memory.h"
     37 #include "memdebug.h"
     38 
     39 void Curl_psl_destroy(struct PslCache *pslcache)
     40 {
     41   if(pslcache->psl) {
     42     if(pslcache->dynamic)
     43       psl_free((psl_ctx_t *)CURL_UNCONST(pslcache->psl));
     44     pslcache->psl = NULL;
     45     pslcache->dynamic = FALSE;
     46   }
     47 }
     48 
     49 static time_t now_seconds(void)
     50 {
     51   struct curltime now = curlx_now();
     52 
     53   return now.tv_sec;
     54 }
     55 
     56 const psl_ctx_t *Curl_psl_use(struct Curl_easy *easy)
     57 {
     58   struct PslCache *pslcache = easy->psl;
     59   const psl_ctx_t *psl;
     60   time_t now;
     61 
     62   if(!pslcache)
     63     return NULL;
     64 
     65   Curl_share_lock(easy, CURL_LOCK_DATA_PSL, CURL_LOCK_ACCESS_SHARED);
     66   now = now_seconds();
     67   if(!pslcache->psl || pslcache->expires <= now) {
     68     /* Let a chance to other threads to do the job: avoids deadlock. */
     69     Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);
     70 
     71     /* Update cache: this needs an exclusive lock. */
     72     Curl_share_lock(easy, CURL_LOCK_DATA_PSL, CURL_LOCK_ACCESS_SINGLE);
     73 
     74     /* Recheck in case another thread did the job. */
     75     now = now_seconds();
     76     if(!pslcache->psl || pslcache->expires <= now) {
     77       bool dynamic = FALSE;
     78       time_t expires = TIME_T_MAX;
     79 
     80 #if defined(PSL_VERSION_NUMBER) && PSL_VERSION_NUMBER >= 0x001000
     81       psl = psl_latest(NULL);
     82       dynamic = psl != NULL;
     83       /* Take care of possible time computation overflow. */
     84       expires = now < TIME_T_MAX - PSL_TTL ? now + PSL_TTL : TIME_T_MAX;
     85 
     86       /* Only get the built-in PSL if we do not already have the "latest". */
     87       if(!psl && !pslcache->dynamic)
     88 #endif
     89 
     90         psl = psl_builtin();
     91 
     92       if(psl) {
     93         Curl_psl_destroy(pslcache);
     94         pslcache->psl = psl;
     95         pslcache->dynamic = dynamic;
     96         pslcache->expires = expires;
     97       }
     98     }
     99     Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);  /* Release exclusive lock. */
    100     Curl_share_lock(easy, CURL_LOCK_DATA_PSL, CURL_LOCK_ACCESS_SHARED);
    101   }
    102   psl = pslcache->psl;
    103   if(!psl)
    104     Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);
    105   return psl;
    106 }
    107 
    108 void Curl_psl_release(struct Curl_easy *easy)
    109 {
    110   Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);
    111 }
    112 
    113 #endif /* USE_LIBPSL */