daemon/cmd_change_app_state.c

   1 /* -*- Mode: C ; c-basic-offset: 2 -*- */
   2 /*
   3  * LADI Session Handler (ladish)
   4  *
   5  * Copyright (C) 2010 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 "../dbus/error.h"
  31 #include "../proxies/notify_proxy.h"
  32 #include "virtualizer.h"
  33
  34 struct ladish_command_change_app_state
  35 {
  36   struct ladish_command command; /* must be the first member */
  37   char * opath;
  38   uint64_t id;
  39   unsigned int target_state;
  40   const char * target_state_description;
  41   bool (* run_target)(struct ladish_command_change_app_state *, ladish_app_supervisor_handle, ladish_app_handle);
  42   void (* initiate_stop)(ladish_app_handle app);
  43 };
  44
  45 static bool run_target_start(struct ladish_command_change_app_state * cmd_ptr, ladish_app_supervisor_handle supervisor, ladish_app_handle app)
  46 {
  47   ASSERT(cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING);
  48   ASSERT(cmd_ptr->initiate_stop == NULL);
  49
  50   if (!ladish_studio_is_started())
  51   {
  52     log_error("cannot start app because studio is not started", cmd_ptr->opath);
  53     ladish_notify_simple(LADISH_NOTIFY_URGENCY_HIGH, "Cannot start app because studio is not started", NULL);
  54     return false;
  55   }
  56
  57   if (ladish_app_is_running(app))
  58   {
  59     log_error("App %s is already running", ladish_app_get_name(app));
  60     ladish_notify_simple(LADISH_NOTIFY_URGENCY_HIGH, "Cannot start app because it is already running", NULL);
  61     return false;
  62   }
  63
  64   if (!ladish_app_supervisor_start_app(supervisor, app))
  65   {
  66     ladish_notify_simple(LADISH_NOTIFY_URGENCY_HIGH, "Cannot start app (execution failed)", NULL);
  67     return false;
  68   }
  69
  70   cmd_ptr->command.state = LADISH_COMMAND_STATE_DONE;
  71   return true;
  72 }
  73
  74 static bool run_target_stop(struct ladish_command_change_app_state * cmd_ptr, ladish_app_supervisor_handle supervisor, ladish_app_handle app)
  75 {
  76   const char * app_name;
  77
  78   ASSERT(cmd_ptr->initiate_stop != NULL);
  79
  80   app_name = ladish_app_get_name(app);
  81
  82   if (ladish_app_is_running(app))
  83   {
  84     if (cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING)
  85     {
  86       cmd_ptr->initiate_stop(app);
  87       cmd_ptr->command.state = LADISH_COMMAND_STATE_WAITING;
  88       return true;
  89     }
  90
  91     ASSERT(cmd_ptr->command.state == LADISH_COMMAND_STATE_WAITING);
  92     log_info("Waiting '%s' process termination (%s)...", app_name, cmd_ptr->target_state_description);
  93     return true;
  94   }
  95
  96   if (!ladish_virtualizer_is_hidden_app(ladish_studio_get_jack_graph(), app_name))
  97   {
  98     log_info("Waiting '%s' client disappear (%s)...", app_name, cmd_ptr->target_state_description);
  99     return true;
 100   }
 101
 102   if (cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING)
 103   {
 104     log_info("App %s is already stopped (%s)", app_name, cmd_ptr->target_state_description);
 105   }
 106
 107   cmd_ptr->command.state = LADISH_COMMAND_STATE_DONE;
 108   return true;
 109 }
 110
 111 #define cmd_ptr ((struct ladish_command_change_app_state *)context)
 112
 113 static bool run(void * context)
 114 {
 115   ladish_app_supervisor_handle supervisor;
 116   ladish_app_handle app;
 117
 118   if (cmd_ptr->command.state == LADISH_COMMAND_STATE_PENDING)
 119   {
 120     log_info("%s app command. opath='%s'", cmd_ptr->target_state_description, cmd_ptr->opath);
 121   }
 122
 123   supervisor = ladish_studio_find_app_supervisor(cmd_ptr->opath);
 124   if (supervisor == NULL)
 125   {
 126     log_error("cannot find supervisor '%s' to %s app", cmd_ptr->opath, cmd_ptr->target_state_description);
 127     ladish_notify_simple(LADISH_NOTIFY_URGENCY_HIGH, "Cannot change app state because of internal error (unknown supervisor)", NULL);
 128     return false;
 129   }
 130
 131   app = ladish_app_supervisor_find_app_by_id(supervisor, cmd_ptr->id);
 132   if (app == NULL)
 133   {
 134     log_error("App with ID %"PRIu64" not found (%s)", cmd_ptr->id, cmd_ptr->target_state_description);
 135     ladish_notify_simple(LADISH_NOTIFY_URGENCY_HIGH, "Cannot change app state because it is not found", NULL);
 136     return false;
 137   }
 138
 139   return cmd_ptr->run_target(cmd_ptr, supervisor, app);
 140 }
 141
 142 static void destructor(void * context)
 143 {
 144   log_info("change_app_state command destructor");
 145   free(cmd_ptr->opath);
 146 }
 147
 148 #undef cmd_ptr
 149
 150 bool ladish_command_change_app_state(void * call_ptr, struct ladish_cqueue * queue_ptr, const char * opath, uint64_t id, unsigned int target_state)
 151 {
 152   struct ladish_command_change_app_state * cmd_ptr;
 153   char * opath_dup;
 154
 155   opath_dup = strdup(opath);
 156   if (opath_dup == NULL)
 157   {
 158     lash_dbus_error(call_ptr, LASH_DBUS_ERROR_GENERIC, "strdup('%s') failed.", opath);
 159     goto fail;
 160   }
 161
 162   cmd_ptr = ladish_command_new(sizeof(struct ladish_command_change_app_state));
 163   if (cmd_ptr == NULL)
 164   {
 165     lash_dbus_error(call_ptr, LASH_DBUS_ERROR_GENERIC, "ladish_command_new() failed.");
 166     goto fail_free_opath;
 167   }
 168
 169   cmd_ptr->command.run = run;
 170   cmd_ptr->command.destructor = destructor;
 171   cmd_ptr->opath = opath_dup;
 172   cmd_ptr->id = id;
 173   cmd_ptr->target_state = target_state;
 174
 175   switch (target_state)
 176   {
 177   case LADISH_APP_STATE_STARTED:
 178     cmd_ptr->target_state_description = "start";
 179     cmd_ptr->run_target = run_target_start;
 180     cmd_ptr->initiate_stop = NULL;
 181     break;
 182   case LADISH_APP_STATE_STOPPED:
 183     cmd_ptr->target_state_description = "stop";
 184     cmd_ptr->run_target = run_target_stop;
 185     cmd_ptr->initiate_stop = ladish_app_stop;
 186     break;
 187   case LADISH_APP_STATE_KILL:
 188     cmd_ptr->target_state_description = "kill";
 189     cmd_ptr->run_target = run_target_stop;
 190     cmd_ptr->initiate_stop = ladish_app_kill;
 191     break;
 192   default:
 193     ASSERT_NO_PASS;
 194     lash_dbus_error(call_ptr, LASH_DBUS_ERROR_GENERIC, "Invalid target state (internal error).", opath);
 195     goto fail_destroy_command;
 196   }
 197
 198   if (!ladish_cqueue_add_command(queue_ptr, &cmd_ptr->command))
 199   {
 200     lash_dbus_error(call_ptr, LASH_DBUS_ERROR_GENERIC, "ladish_cqueue_add_command() failed.");
 201     goto fail_destroy_command;
 202   }
 203
 204   return true;
 205
 206 fail_destroy_command:
 207   free(cmd_ptr);
 208 fail_free_opath:
 209   free(opath_dup);
 210 fail:
 211   return false;
 212 }