LCOV - code coverage report
Current view: top level - mhd - mhd_run.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 59 72 81.9 %
Date: 2025-06-22 12:09:43 Functions: 6 7 85.7 %

          Line data    Source code
       1             : /*
       2             :   This file is part of TALER
       3             :   Copyright (C) 2019-2025 Taler Systems SA
       4             : 
       5             :   TALER is free software; you can redistribute it and/or modify it under the
       6             :   terms of the GNU Affero General Public License as published by the Free Software
       7             :   Foundation; either version 3, or (at your option) any later version.
       8             : 
       9             :   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
      10             :   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
      11             :   A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
      12             : 
      13             :   You should have received a copy of the GNU Affero General Public License along with
      14             :   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
      15             : */
      16             : /**
      17             :  * @file mhd_run.c
      18             :  * @brief API for running an MHD daemon with the
      19             :  *        GNUnet scheduler
      20             :  * @author Christian Grothoff
      21             :  */
      22             : #include "taler/platform.h"
      23             : #include <gnunet/gnunet_util_lib.h>
      24             : #include <gnunet/gnunet_json_lib.h>
      25             : #include <jansson.h>
      26             : #include <microhttpd.h>
      27             : #include "taler/taler_util.h"
      28             : #include "taler/taler_mhd_lib.h"
      29             : 
      30             : 
      31             : /**
      32             :  * Entry in list of HTTP servers we are running.
      33             :  */
      34             : struct DaemonEntry
      35             : {
      36             :   /**
      37             :    * Kept in a DLL.
      38             :    */
      39             :   struct DaemonEntry *next;
      40             : 
      41             :   /**
      42             :    * Kept in a DLL.
      43             :    */
      44             :   struct DaemonEntry *prev;
      45             : 
      46             :   /**
      47             :    * The actual daemon.
      48             :    */
      49             :   struct MHD_Daemon *mhd;
      50             : 
      51             :   /**
      52             :    * Task running the HTTP server.
      53             :    */
      54             :   struct GNUNET_SCHEDULER_Task *mhd_task;
      55             : 
      56             :   /**
      57             :    * Set to true if we should immediately MHD_run() again.
      58             :    */
      59             :   bool triggered;
      60             : 
      61             : };
      62             : 
      63             : 
      64             : /**
      65             :  * Head of list of HTTP servers.
      66             :  */
      67             : static struct DaemonEntry *mhd_head;
      68             : 
      69             : /**
      70             :  * Tail of list of HTTP servers.
      71             :  */
      72             : static struct DaemonEntry *mhd_tail;
      73             : 
      74             : 
      75             : /**
      76             :  * Function that queries MHD's select sets and
      77             :  * starts the task waiting for them.
      78             :  *
      79             :  * @param[in,out] de daemon to start tasks for
      80             :  */
      81             : static void
      82             : prepare_daemon (struct DaemonEntry *de);
      83             : 
      84             : 
      85             : /**
      86             :  * Call MHD to process pending requests and then go back
      87             :  * and schedule the next run.
      88             :  *
      89             :  * @param cls our `struct DaemonEntry *`
      90             :  */
      91             : static void
      92        6655 : run_daemon (void *cls)
      93             : {
      94        6655 :   struct DaemonEntry *de = cls;
      95             : 
      96        6655 :   de->mhd_task = NULL;
      97             :   do {
      98        6663 :     de->triggered = false;
      99        6663 :     GNUNET_assert (MHD_YES ==
     100             :                    MHD_run (de->mhd));
     101        6663 :   } while (de->triggered);
     102        6655 :   prepare_daemon (de);
     103        6655 : }
     104             : 
     105             : 
     106             : static void
     107        6769 : prepare_daemon (struct DaemonEntry *de)
     108             : {
     109             :   fd_set rs;
     110             :   fd_set ws;
     111             :   fd_set es;
     112             :   struct GNUNET_NETWORK_FDSet *wrs;
     113             :   struct GNUNET_NETWORK_FDSet *wws;
     114             :   int max;
     115             :   MHD_UNSIGNED_LONG_LONG timeout;
     116             :   int haveto;
     117             :   struct GNUNET_TIME_Relative tv;
     118             : 
     119      115073 :   FD_ZERO (&rs);
     120      115073 :   FD_ZERO (&ws);
     121      115073 :   FD_ZERO (&es);
     122        6769 :   wrs = GNUNET_NETWORK_fdset_create ();
     123        6769 :   wws = GNUNET_NETWORK_fdset_create ();
     124        6769 :   max = -1;
     125        6769 :   GNUNET_assert (MHD_YES ==
     126             :                  MHD_get_fdset (de->mhd,
     127             :                                 &rs,
     128             :                                 &ws,
     129             :                                 &es,
     130             :                                 &max));
     131        6769 :   haveto = MHD_get_timeout (de->mhd,
     132             :                             &timeout);
     133        6769 :   if (haveto == MHD_YES)
     134        5641 :     tv = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
     135             :                                         timeout);
     136             :   else
     137        1128 :     tv = GNUNET_TIME_UNIT_FOREVER_REL;
     138        6769 :   GNUNET_NETWORK_fdset_copy_native (wrs,
     139             :                                     &rs,
     140             :                                     max + 1);
     141        6769 :   GNUNET_NETWORK_fdset_copy_native (wws,
     142             :                                     &ws,
     143             :                                     max + 1);
     144        6769 :   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
     145             :               "Adding run_daemon select task\n");
     146             :   de->mhd_task
     147        6769 :     = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_HIGH,
     148             :                                    tv,
     149             :                                    wrs,
     150             :                                    wws,
     151             :                                    &run_daemon,
     152             :                                    de);
     153        6769 :   GNUNET_NETWORK_fdset_destroy (wrs);
     154        6769 :   GNUNET_NETWORK_fdset_destroy (wws);
     155        6769 : }
     156             : 
     157             : 
     158             : void
     159         114 : TALER_MHD_daemon_start (struct MHD_Daemon *daemon)
     160             : {
     161             :   struct DaemonEntry *de;
     162             : 
     163         114 :   de = GNUNET_new (struct DaemonEntry);
     164         114 :   de->mhd = daemon;
     165         114 :   GNUNET_CONTAINER_DLL_insert (mhd_head,
     166             :                                mhd_tail,
     167             :                                de);
     168         114 :   prepare_daemon (de);
     169         114 : }
     170             : 
     171             : 
     172             : void
     173          57 : TALER_MHD_daemons_halt (void)
     174             : {
     175          57 :   for (struct DaemonEntry *de = mhd_head;
     176         171 :        NULL != de;
     177         114 :        de = de->next)
     178             :   {
     179         114 :     if (NULL != de->mhd_task)
     180             :     {
     181         114 :       GNUNET_SCHEDULER_cancel (de->mhd_task);
     182         114 :       de->mhd_task = NULL;
     183             :     }
     184         114 :     de->triggered = false;
     185             :   }
     186          57 : }
     187             : 
     188             : 
     189             : void
     190           0 : TALER_MHD_daemons_quiesce (void)
     191             : {
     192           0 :   for (struct DaemonEntry *de = mhd_head;
     193           0 :        NULL != de;
     194           0 :        de = de->next)
     195             :   {
     196             :     int fd;
     197             : 
     198           0 :     if (NULL != de->mhd_task)
     199             :     {
     200           0 :       GNUNET_SCHEDULER_cancel (de->mhd_task);
     201           0 :       de->mhd_task = NULL;
     202             :     }
     203           0 :     de->triggered = false;
     204           0 :     fd = MHD_quiesce_daemon  (de->mhd);
     205           0 :     GNUNET_break (0 == close (fd));
     206             :   }
     207           0 : }
     208             : 
     209             : 
     210             : void
     211          57 : TALER_MHD_daemons_destroy (void)
     212             : {
     213             :   struct DaemonEntry *de;
     214             : 
     215         171 :   while (NULL != (de = mhd_head))
     216             :   {
     217         114 :     struct MHD_Daemon *mhd = de->mhd;
     218             : 
     219         114 :     if (NULL != de->mhd_task)
     220             :     {
     221           0 :       GNUNET_SCHEDULER_cancel (de->mhd_task);
     222           0 :       de->mhd_task = NULL;
     223             :     }
     224         114 :     MHD_stop_daemon (mhd);
     225         114 :     GNUNET_CONTAINER_DLL_remove (mhd_head,
     226             :                                  mhd_tail,
     227             :                                  de);
     228         114 :     GNUNET_free (de);
     229             :   }
     230          57 : }
     231             : 
     232             : 
     233             : void
     234         238 : TALER_MHD_daemon_trigger (void)
     235             : {
     236         238 :   for (struct DaemonEntry *de = mhd_head;
     237         714 :        NULL != de;
     238         476 :        de = de->next)
     239             :   {
     240         476 :     if (NULL != de->mhd_task)
     241             :     {
     242         468 :       GNUNET_SCHEDULER_cancel (de->mhd_task);
     243         468 :       de->mhd_task = GNUNET_SCHEDULER_add_now (&run_daemon,
     244             :                                                de);
     245             :     }
     246             :     else
     247             :     {
     248           8 :       de->triggered = true;
     249             :     }
     250             :   }
     251         238 : }
     252             : 
     253             : 
     254             : /* end of mhd_run.c */

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