daemon/cmd_change_app_state.c

   1 /* -*- Mode: C ; c-basic-offset: 2 -*- */
   2 /*
   3  * LADI Session Handler (ladish)
   4  *
   5  * Copyright (C) 2010,2011,2012 Nedko Arnaudov <nedko@arnaudov.name>
   6  *
   7  **************************************************************************
   8  * This file contains implementation of the "change app state" command
   9  **************************************************************************
  10  *
  11  * LADI Session Handler is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * LADI Session Handler is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with LADI Session Handler. If not, see <http://www.gnu.org/licenses/>
  23  * or write to the Free Software Foundation, Inc.,
  24  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  25  */
  26
  27 #include <ctype.h>
  28 #include "cmd.h"
  29 #include "studio.h"
  30 #include "../proxies/notify_proxy.h"
  31 #include "virtualizer.h"
  32
  33 struct ladish_command_change_app_state
  34 {
  35   struct ladish_command command; /* must be the first member */
  36   char * opath;
  37   uint64_t id;
  38   unsigned int target_state;
  39   const char * target_state_description;
  40   bool (* run_target)(struct ladish_command_change_app_state *, ladish_app_supervisor_handle, ladish_app_handle);
  41   void (* initiate_stop)(ladish_app_handle app);
  42 };
  43
  44 static bool run_target_start(struct ladish_command_change_app_state * cmd_ptr, ladish_app_supervisor_handle supervisor, ladish_app_handle app)
  45 {
  46   ASSERT(cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING);
  47   ASSERT(cmd_ptr->initiate_stop == NULL);
  48
  49   if (!ladish_studio_is_started())
  50   {
  51     log_error("cannot start app because studio is not started");
  52     ladish_notify_simple(LADISH_NOTIFY_URGENCY_HIGH, "Cannot start app because studio is not started", NULL);
  53     return false;
  54   }
  55
  56   if (ladish_app_is_running(app))
  57   {
  58     log_error("App %s is already running", ladish_app_get_name(app));
  59     ladish_notify_simple(LADISH_NOTIFY_URGENCY_HIGH, "Cannot start app because it is already running", NULL);
  60     return false;
  61   }
  62
  63   if (!ladish_app_supervisor_start_app(supervisor, app))
  64   {
  65     ladish_notify_simple(LADISH_NOTIFY_URGENCY_HIGH, "Cannot start app (execution failed)", NULL);
  66     return false;
  67   }
  68
  69   cmd_ptr->command.state = LADISH_COMMAND_STATE_DONE;
  70   return true;
  71 }
  72
  73 static
  74 bool
  75 run_target_stop(
  76   struct ladish_command_change_app_state * cmd_ptr,
  77   ladish_app_supervisor_handle UNUSED(supervisor),
  78   ladish_app_handle app)
  79 {
  80   const char * app_name;
  81   uuid_t app_uuid;
  82
  83   ASSERT(cmd_ptr->initiate_stop != NULL);
  84
  85   app_name = ladish_app_get_name(app);
  86   ladish_app_get_uuid(app, app_uuid);
  87
  88   if (ladish_app_is_running(app))
  89   {
  90     if (cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING)
  91     {
  92       cmd_ptr->initiate_stop(app);
  93       cmd_ptr->command.state = LADISH_COMMAND_STATE_WAITING;
  94       return true;
  95     }
  96
  97     ASSERT(cmd_ptr->command.state == LADISH_COMMAND_STATE_WAITING);
  98     log_info("Waiting '%s' process termination (%s)...", app_name, cmd_ptr->target_state_description);
  99     return true;
 100   }
 101
 102   if (!ladish_virtualizer_is_hidden_app(ladish_studio_get_jack_graph(), app_uuid, app_name))
 103   {
 104     log_info("Waiting '%s' client disappear (%s)...", app_name, cmd_ptr->target_state_description);
 105     return true;
 106   }
 107
 108   if (cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING)
 109   {
 110     log_info("App %s is already stopped (%s)", app_name, cmd_ptr->target_state_description);
 111   }
 112
 113   cmd_ptr->command.state = LADISH_COMMAND_STATE_DONE;
 114   return true;
 115 }
 116
 117 #define cmd_ptr ((struct ladish_command_change_app_state *)context)
 118
 119 static bool run(void * context)
 120 {
 121   ladish_app_supervisor_handle supervisor;
 122   ladish_app_handle app;
 123
 124   if (cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING)
 125   {
 126     log_info("%s app command. opath='%s'", cmd_ptr->target_state_description, cmd_ptr->opath);
 127   }
 128
 129   supervisor = ladish_studio_find_app_supervisor(cmd_ptr->opath);
 130   if (supervisor == NULL)
 131   {
 132     log_error("cannot find supervisor '%s' to %s app", cmd_ptr->opath, cmd_ptr->target_state_description);
 133     ladish_notify_simple(LADISH_NOTIFY_URGENCY_HIGH, "Cannot change app state because of internal error (unknown supervisor)", NULL);
 134     return false;
 135   }
 136
 137   app = ladish_app_supervisor_find_app_by_id(supervisor, cmd_ptr->id);
 138   if (app == NULL)
 139   {
 140     log_error("App with ID %"PRIu64" not found (%s)", cmd_ptr->id, cmd_ptr->target_state_description);
 141     ladish_notify_simple(LADISH_NOTIFY_URGENCY_HIGH, "Cannot change app state because it is not found", NULL);
 142     return false;
 143   }
 144
 145   return cmd_ptr->run_target(cmd_ptr, supervisor, app);
 146 }
 147
 148 static void destructor(void * context)
 149 {
 150   log_info("change_app_state command destructor");
 151   free(cmd_ptr->opath);
 152 }
 153
 154 #undef cmd_ptr
 155
 156 bool ladish_command_change_app_state(void * call_ptr, struct ladish_cqueue * queue_ptr, const char * opath, uint64_t id, unsigned int target_state)
 157 {
 158   struct ladish_command_change_app_state * cmd_ptr;
 159   char * opath_dup;
 160
 161   opath_dup = strdup(opath);
 162   if (opath_dup == NULL)
 163   {
 164     cdbus_error(call_ptr, DBUS_ERROR_FAILED, "strdup('%s') failed.", opath);
 165     goto fail;
 166   }
 167
 168   cmd_ptr = ladish_command_new(sizeof(struct ladish_command_change_app_state));
 169   if (cmd_ptr == NULL)
 170   {
 171     cdbus_error(call_ptr, DBUS_ERROR_FAILED, "ladish_command_new() failed.");
 172     goto fail_free_opath;
 173   }
 174
 175   cmd_ptr->command.run = run;
 176   cmd_ptr->command.destructor = destructor;
 177   cmd_ptr->opath = opath_dup;
 178   cmd_ptr->id = id;
 179   cmd_ptr->target_state = target_state;
 180
 181   switch (target_state)
 182   {
 183   case LADISH_APP_STATE_STARTED:
 184     cmd_ptr->target_state_description = "start";
 185     cmd_ptr->run_target = run_target_start;
 186     cmd_ptr->initiate_stop = NULL;
 187     break;
 188   case LADISH_APP_STATE_STOPPED:
 189     cmd_ptr->target_state_description = "stop";
 190     cmd_ptr->run_target = run_target_stop;
 191     cmd_ptr->initiate_stop = ladish_app_stop;
 192     break;
 193   case LADISH_APP_STATE_KILL:
 194     cmd_ptr->target_state_description = "kill";
 195     cmd_ptr->run_target = run_target_stop;
 196     cmd_ptr->initiate_stop = ladish_app_kill;
 197     break;
 198   default:
 199     ASSERT_NO_PASS;
 200     cdbus_error(call_ptr, DBUS_ERROR_FAILED, "Invalid target state (internal error).", opath);
 201     goto fail_destroy_command;
 202   }
 203
 204   if (!ladish_cqueue_add_command(queue_ptr, &cmd_ptr->command))
 205   {
 206     cdbus_error(call_ptr, DBUS_ERROR_FAILED, "ladish_cqueue_add_command() failed.");
 207     goto fail_destroy_command;
 208   }
 209
 210   return true;
 211
 212 fail_destroy_command:
 213   free(cmd_ptr);
 214 fail_free_opath:
 215   free(opath_dup);
 216 fail:
 217   return false;
 218 }