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-rw-r--r--src/shell-app-cache.c404
1 files changed, 404 insertions, 0 deletions
diff --git a/src/shell-app-cache.c b/src/shell-app-cache.c
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+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+#include "config.h"
+
+#include "shell-app-cache-private.h"
+
+/**
+ * SECTION:shell-app-cache
+ * @title: ShellAppCache
+ * @short_description: application information cache
+ *
+ * The #ShellAppCache is responsible for caching information about #GAppInfo
+ * to ensure that the compositor thread never needs to perform disk reads to
+ * access them. All of the work is done off-thread. When the new data has
+ * been loaded, a #ShellAppCache::changed signal is emitted.
+ *
+ * Additionally, the #ShellAppCache caches information about translations for
+ * directories. This allows translation provided in [Desktop Entry] GKeyFiles
+ * to be available when building StLabel and other elements without performing
+ * costly disk reads.
+ *
+ * Various monitors are used to keep this information up to date while the
+ * Shell is running.
+ */
+
+#define DEFAULT_TIMEOUT_SECONDS 5
+
+struct _ShellAppCache
+{
+ GObject parent_instance;
+
+ GAppInfoMonitor *monitor;
+ GPtrArray *dir_monitors;
+ GHashTable *folders;
+ GCancellable *cancellable;
+ GList *app_infos;
+
+ guint queued_update;
+};
+
+typedef struct
+{
+ GList *app_infos;
+ GHashTable *folders;
+} CacheState;
+
+G_DEFINE_TYPE (ShellAppCache, shell_app_cache, G_TYPE_OBJECT)
+
+enum {
+ CHANGED,
+ N_SIGNALS
+};
+
+static guint signals [N_SIGNALS];
+
+static void
+cache_state_free (CacheState *state)
+{
+ g_clear_pointer (&state->folders, g_hash_table_unref);
+ g_list_free_full (state->app_infos, g_object_unref);
+ g_slice_free (CacheState, state);
+}
+
+static CacheState *
+cache_state_new (void)
+{
+ CacheState *state;
+
+ state = g_slice_new0 (CacheState);
+ state->folders = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
+
+ return g_steal_pointer (&state);
+}
+
+/**
+ * shell_app_cache_get_default:
+ *
+ * Gets the default #ShellAppCache.
+ *
+ * Returns: (transfer none): a #ShellAppCache
+ */
+ShellAppCache *
+shell_app_cache_get_default (void)
+{
+ static ShellAppCache *instance;
+
+ if (instance == NULL)
+ {
+ instance = g_object_new (SHELL_TYPE_APP_CACHE, NULL);
+ g_object_add_weak_pointer (G_OBJECT (instance), (gpointer *)&instance);
+ }
+
+ return instance;
+}
+
+static void
+load_folder (GHashTable *folders,
+ const char *path)
+{
+ g_autoptr(GDir) dir = NULL;
+ const char *name;
+
+ g_assert (folders != NULL);
+ g_assert (path != NULL);
+
+ dir = g_dir_open (path, 0, NULL);
+ if (dir == NULL)
+ return;
+
+ while ((name = g_dir_read_name (dir)))
+ {
+ g_autofree gchar *filename = NULL;
+ g_autoptr(GKeyFile) keyfile = NULL;
+
+ /* First added wins */
+ if (g_hash_table_contains (folders, name))
+ continue;
+
+ filename = g_build_filename (path, name, NULL);
+ keyfile = g_key_file_new ();
+
+ if (g_key_file_load_from_file (keyfile, filename, G_KEY_FILE_NONE, NULL))
+ {
+ gchar *translated;
+
+ translated = g_key_file_get_locale_string (keyfile,
+ "Desktop Entry", "Name",
+ NULL, NULL);
+
+ if (translated != NULL)
+ g_hash_table_insert (folders, g_strdup (name), translated);
+ }
+ }
+}
+
+static void
+load_folders (GHashTable *folders)
+{
+ const char * const *dirs;
+ g_autofree gchar *userdir = NULL;
+ guint i;
+
+ g_assert (folders != NULL);
+
+ userdir = g_build_filename (g_get_user_data_dir (), "desktop-directories", NULL);
+ load_folder (folders, userdir);
+
+ dirs = g_get_system_data_dirs ();
+ for (i = 0; dirs[i] != NULL; i++)
+ {
+ g_autofree gchar *sysdir = g_build_filename (dirs[i], "desktop-directories", NULL);
+ load_folder (folders, sysdir);
+ }
+}
+
+static void
+shell_app_cache_worker (GTask *task,
+ gpointer source_object,
+ gpointer task_data,
+ GCancellable *cancellable)
+{
+ CacheState *state;
+
+ g_assert (G_IS_TASK (task));
+ g_assert (SHELL_IS_APP_CACHE (source_object));
+
+ state = cache_state_new ();
+ state->app_infos = g_app_info_get_all ();
+ load_folders (state->folders);
+
+ g_task_return_pointer (task, state, (GDestroyNotify) cache_state_free);
+}
+
+static void
+apply_update_cb (GObject *object,
+ GAsyncResult *result,
+ gpointer user_data)
+{
+ ShellAppCache *cache = (ShellAppCache *)object;
+ g_autoptr(GError) error = NULL;
+ CacheState *state;
+
+ g_assert (SHELL_IS_APP_CACHE (cache));
+ g_assert (G_IS_TASK (result));
+ g_assert (user_data == NULL);
+
+ state = g_task_propagate_pointer (G_TASK (result), &error);
+
+ if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
+ return;
+
+ g_list_free_full (cache->app_infos, g_object_unref);
+ cache->app_infos = g_steal_pointer (&state->app_infos);
+
+ g_clear_pointer (&cache->folders, g_hash_table_unref);
+ cache->folders = g_steal_pointer (&state->folders);
+
+ g_signal_emit (cache, signals[CHANGED], 0);
+
+ cache_state_free (state);
+}
+
+static gboolean
+shell_app_cache_do_update (gpointer user_data)
+{
+ ShellAppCache *cache = user_data;
+ g_autoptr(GTask) task = NULL;
+
+ cache->queued_update = 0;
+
+ /* Reset the cancellable state so we don't race with
+ * two updates coming back overlapped and applying the
+ * information in the wrong order.
+ */
+ g_cancellable_cancel (cache->cancellable);
+ g_clear_object (&cache->cancellable);
+ cache->cancellable = g_cancellable_new ();
+
+ task = g_task_new (cache, cache->cancellable, apply_update_cb, NULL);
+ g_task_set_source_tag (task, shell_app_cache_do_update);
+ g_task_run_in_thread (task, shell_app_cache_worker);
+
+ return G_SOURCE_REMOVE;
+}
+
+static void
+shell_app_cache_queue_update (ShellAppCache *self)
+{
+ g_assert (SHELL_IS_APP_CACHE (self));
+
+ if (self->queued_update != 0)
+ g_source_remove (self->queued_update);
+
+ self->queued_update = g_timeout_add_seconds (DEFAULT_TIMEOUT_SECONDS,
+ shell_app_cache_do_update,
+ self);
+}
+
+static void
+monitor_desktop_directories_for_data_dir (ShellAppCache *self,
+ const gchar *directory)
+{
+ g_autofree gchar *subdir = NULL;
+ g_autoptr(GFile) file = NULL;
+ g_autoptr(GFileMonitor) monitor = NULL;
+
+ g_assert (SHELL_IS_APP_CACHE (self));
+
+ if (directory == NULL)
+ return;
+
+ subdir = g_build_filename (directory, "desktop-directories", NULL);
+ file = g_file_new_for_path (subdir);
+ monitor = g_file_monitor_directory (file, G_FILE_MONITOR_NONE, NULL, NULL);
+
+ if (monitor != NULL)
+ {
+ g_file_monitor_set_rate_limit (monitor, DEFAULT_TIMEOUT_SECONDS * 1000);
+ g_signal_connect_object (monitor,
+ "changed",
+ G_CALLBACK (shell_app_cache_queue_update),
+ self,
+ G_CONNECT_SWAPPED);
+ g_ptr_array_add (self->dir_monitors, g_steal_pointer (&monitor));
+ }
+}
+
+static void
+shell_app_cache_finalize (GObject *object)
+{
+ ShellAppCache *self = (ShellAppCache *)object;
+
+ g_clear_object (&self->monitor);
+
+ if (self->queued_update)
+ {
+ g_source_remove (self->queued_update);
+ self->queued_update = 0;
+ }
+
+ g_clear_pointer (&self->dir_monitors, g_ptr_array_unref);
+ g_clear_pointer (&self->folders, g_hash_table_unref);
+ g_list_free_full (self->app_infos, g_object_unref);
+
+ G_OBJECT_CLASS (shell_app_cache_parent_class)->finalize (object);
+}
+
+static void
+shell_app_cache_class_init (ShellAppCacheClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+ object_class->finalize = shell_app_cache_finalize;
+
+ /**
+ * ShellAppCache::changed:
+ *
+ * The "changed" signal is emitted when the cache has updated
+ * information about installed applications.
+ */
+ signals [CHANGED] =
+ g_signal_new ("changed",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_LAST,
+ 0, NULL, NULL, NULL,
+ G_TYPE_NONE, 0);
+}
+
+static void
+shell_app_cache_init (ShellAppCache *self)
+{
+ const gchar * const *sysdirs;
+ guint i;
+
+ /* Monitor directories for translation changes */
+ self->dir_monitors = g_ptr_array_new_with_free_func (g_object_unref);
+ monitor_desktop_directories_for_data_dir (self, g_get_user_data_dir ());
+ sysdirs = g_get_system_data_dirs ();
+ for (i = 0; sysdirs[i] != NULL; i++)
+ monitor_desktop_directories_for_data_dir (self, sysdirs[i]);
+
+ /* Load translated directory names immediately */
+ self->folders = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
+ load_folders (self->folders);
+
+ /* Setup AppMonitor to track changes */
+ self->monitor = g_app_info_monitor_get ();
+ g_signal_connect_object (self->monitor,
+ "changed",
+ G_CALLBACK (shell_app_cache_queue_update),
+ self,
+ G_CONNECT_SWAPPED);
+ self->app_infos = g_app_info_get_all ();
+}
+
+/**
+ * shell_app_cache_get_all:
+ * @cache: (nullable): a #ShellAppCache or %NULL
+ *
+ * Like g_app_info_get_all() but always returns a
+ * cached set of application info so the caller can be
+ * sure that I/O will not happen on the current thread.
+ *
+ * Returns: (transfer none) (element-type GAppInfo):
+ * a #GList of references to #GAppInfo.
+ */
+GList *
+shell_app_cache_get_all (ShellAppCache *cache)
+{
+ g_return_val_if_fail (SHELL_IS_APP_CACHE (cache), NULL);
+
+ return cache->app_infos;
+}
+
+/**
+ * shell_app_cache_get_info:
+ * @cache: (nullable): a #ShellAppCache or %NULL
+ * @id: the application id
+ *
+ * A replacement for g_desktop_app_info_new() that will lookup the
+ * information from the cache instead of (re)loading from disk.
+ *
+ * Returns: (nullable) (transfer none): a #GDesktopAppInfo or %NULL
+ */
+GDesktopAppInfo *
+shell_app_cache_get_info (ShellAppCache *cache,
+ const char *id)
+{
+ const GList *iter;
+
+ g_return_val_if_fail (SHELL_IS_APP_CACHE (cache), NULL);
+
+ for (iter = cache->app_infos; iter != NULL; iter = iter->next)
+ {
+ GAppInfo *info = iter->data;
+
+ if (g_strcmp0 (id, g_app_info_get_id (info)) == 0)
+ return G_DESKTOP_APP_INFO (info);
+ }
+
+ return NULL;
+}
+
+/**
+ * shell_app_cache_translate_folder:
+ * @cache: (nullable): a #ShellAppCache or %NULL
+ * @name: the folder name
+ *
+ * Gets the translated folder name for @name if any exists.
+ *
+ * Returns: (nullable): the translated string or %NULL if there is no
+ * translation.
+ */
+char *
+shell_app_cache_translate_folder (ShellAppCache *cache,
+ const char *name)
+{
+ g_return_val_if_fail (SHELL_IS_APP_CACHE (cache), NULL);
+
+ if (name == NULL)
+ return NULL;
+
+ return g_strdup (g_hash_table_lookup (cache->folders, name));
+}