[gnome-photos/wip/rishi/collection: 25/44] source-manager: Track GMounts representing USB storage & PTP devices

[Debarshi Ray <debarshir src gnome org>]

commit dca4b38a66b52daf4817929955b2be22b139a4c9
Author: Petr Štětka <stetka peta gmail com>
Date:   Wed Sep 6 09:29:08 2017 +0200

    source-manager: Track GMounts representing USB storage & PTP devices
    
    The GMounts are synchronously enumerated at start-up. However, since
    hot-plugging a USB device generates a flurry of events from
    GVolumeMonitor while the GDaemonMount gets created and then shadowed
    by a new GProxyShadowMount, SourceManager waits for a small period of
    time to let things settle down before updating itself.
    
    Only USB mass storage and PTP devices, represented by the "file" and
    "gphoto2" URI schemes are tracked at the moment.
    
    https://gitlab.gnome.org/GNOME/gnome-photos/issues/29

 src/photos-source-manager.c | 214 ++++++++++++++++++++++++++++++++++----------
 1 file changed, 165 insertions(+), 49 deletions(-)
---
diff --git a/src/photos-source-manager.c b/src/photos-source-manager.c
index 97eca03d..4c0d9612 100644
--- a/src/photos-source-manager.c
+++ b/src/photos-source-manager.c
@@ -40,7 +40,9 @@ struct _PhotosSourceManager
   PhotosBaseManager parent_instance;
   GCancellable *cancellable;
   GHashTable *sources_notified;
+  GVolumeMonitor *volume_monitor;
   GoaClient *client;
+  guint refresh_mounts_timeout_id;
 };
 
 enum
@@ -56,6 +58,12 @@ static guint signals[LAST_SIGNAL] = { 0 };
 G_DEFINE_TYPE (PhotosSourceManager, photos_source_manager, PHOTOS_TYPE_BASE_MANAGER);
 
 
+enum
+{
+  REFRESH_MOUNTS_TIMEOUT = 1 /* s */
+};
+
+
 static gchar *
 photos_source_manager_get_filter (PhotosBaseManager *mngr, gint flags)
 {
@@ -107,71 +115,55 @@ photos_source_manager_remove_object_by_id (PhotosBaseManager *mngr, const gchar
 }
 
 
-static void
-photos_source_manager_refresh_accounts (PhotosSourceManager *self)
+static gboolean
+photos_source_manager_online_source_needs_notification (PhotosSource *source)
 {
-  GApplication *app;
-  g_autoptr (GHashTable) new_sources = NULL;
-  GList *accounts = NULL;
-  GList *l;
-  guint i;
-  guint n_items;
+  GoaAccount *account;
+  GoaObject *object;
+  gboolean attention_needed;
 
-  app = g_application_get_default ();
-  if (photos_application_get_empty_results (PHOTOS_APPLICATION (app)))
-    goto out;
-
-  accounts = goa_client_get_accounts (self->client);
-  new_sources = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_object_unref);
-
-  for (l = accounts; l != NULL; l = l->next)
-    {
-      GoaAccount *account;
-      GoaObject *object = GOA_OBJECT (l->data);
-      g_autoptr (PhotosSource) source = NULL;
-      const gchar *id;
-
-      account = goa_object_peek_account (object);
-      if (account == NULL)
-        continue;
+  object = photos_source_get_goa_object (source);
+  g_return_val_if_fail (GOA_IS_OBJECT (object), FALSE);
 
-      if (goa_account_get_photos_disabled (account))
-        continue;
+  account = goa_object_peek_account (object);
+  g_return_val_if_fail (GOA_IS_ACCOUNT (account), FALSE);
 
-      if (goa_object_peek_photos (object) == NULL)
-        continue;
+  attention_needed = goa_account_get_attention_needed (account);
+  return attention_needed;
+}
 
-      source = photos_source_new_from_goa_object (GOA_OBJECT (l->data));
-      id = photos_filterable_get_id (PHOTOS_FILTERABLE (source));
-      g_hash_table_insert (new_sources, g_strdup (id), g_object_ref (source));
-    }
 
-  photos_base_manager_process_new_objects (PHOTOS_BASE_MANAGER (self), new_sources);
+static void
+photos_source_manager_notify_sources (PhotosSourceManager *self)
+{
+  guint i;
+  guint n_items;
 
   n_items = g_list_model_get_n_items (G_LIST_MODEL (self));
   for (i = 0; i < n_items; i++)
     {
-      GoaAccount *account;
+      GMount *mount;
       GoaObject *object;
       g_autoptr (PhotosSource) source = NULL;
-      gboolean attention_needed;
+      gboolean needs_notification;
       gboolean source_notified;
       const gchar *id;
 
       source = PHOTOS_SOURCE (g_list_model_get_object (G_LIST_MODEL (self), i));
+      mount = photos_source_get_mount (source);
       object = photos_source_get_goa_object (source);
-      if (object == NULL)
-        continue;
 
-      account = goa_object_peek_account (object);
-      if (account == NULL)
-        continue;
+      if (object != NULL)
+        needs_notification = photos_source_manager_online_source_needs_notification (source);
+      else if (mount != NULL)
+        needs_notification = TRUE;
+      else
+        needs_notification = FALSE;
 
-      attention_needed = goa_account_get_attention_needed (account);
       id = photos_filterable_get_id (PHOTOS_FILTERABLE (source));
       source_notified = g_hash_table_contains (self->sources_notified, id);
 
-      if (!attention_needed && source_notified)
+      if (!needs_notification && source_notified)
         {
           gboolean removed;
 
@@ -179,7 +171,7 @@ photos_source_manager_refresh_accounts (PhotosSourceManager *self)
           removed = g_hash_table_remove (self->sources_notified, id);
           g_assert_true (removed);
         }
-      else if (attention_needed && !source_notified)
+      else if (needs_notification && !source_notified)
         {
           gboolean inserted;
 
@@ -188,9 +180,112 @@ photos_source_manager_refresh_accounts (PhotosSourceManager *self)
           g_assert_true (inserted);
         }
     }
+}
+
+
+static void
+photos_source_manager_refresh_sources (PhotosSourceManager *self)
+{
+  GApplication *app;
+  g_autoptr (GHashTable) new_sources = NULL;
+  GList *l;
+  GList *mounts = NULL;
+
+  app = g_application_get_default ();
+  if (photos_application_get_empty_results (PHOTOS_APPLICATION (app)))
+    goto out;
+
+  new_sources = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_object_unref);
+
+  mounts = g_volume_monitor_get_mounts (self->volume_monitor);
+
+  for (l = mounts; l != NULL; l = l->next)
+    {
+      g_autoptr (GFile) root = NULL;
+      GMount *mount = G_MOUNT (l->data);
+      g_autoptr (PhotosSource) source = NULL;
+      const gchar *id;
+
+      if (g_mount_is_shadowed (mount))
+        continue;
+
+      root = g_mount_get_root (mount);
+      if (!g_file_has_uri_scheme (root, "file") && !g_file_has_uri_scheme (root, "gphoto2"))
+        continue;
+
+      source = photos_source_new_from_mount (mount);
+      id = photos_filterable_get_id (PHOTOS_FILTERABLE (source));
+      g_hash_table_insert (new_sources, g_strdup (id), g_object_ref (source));
+    }
+
+  if (self->client != NULL)
+    {
+      GList *accounts = NULL;
+
+      accounts = goa_client_get_accounts (self->client);
+
+      for (l = accounts; l != NULL; l = l->next)
+        {
+          GoaAccount *account;
+          GoaObject *object = GOA_OBJECT (l->data);
+          g_autoptr (PhotosSource) source = NULL;
+          const gchar *id;
+
+          account = goa_object_peek_account (object);
+          if (account == NULL)
+            continue;
+
+          if (goa_account_get_photos_disabled (account))
+            continue;
+
+          if (goa_object_peek_photos (object) == NULL)
+            continue;
+
+          source = photos_source_new_from_goa_object (GOA_OBJECT (l->data));
+          id = photos_filterable_get_id (PHOTOS_FILTERABLE (source));
+          g_hash_table_insert (new_sources, g_strdup (id), g_object_ref (source));
+        }
+
+      g_list_free_full (accounts, g_object_unref);
+    }
+
+  photos_base_manager_process_new_objects (PHOTOS_BASE_MANAGER (self), new_sources);
+  photos_source_manager_notify_sources (self);
 
  out:
-  g_list_free_full (accounts, g_object_unref);
+  return;
+}
+
+
+static gboolean
+photos_source_manager_refresh_mounts_timeout (gpointer user_data)
+{
+  PhotosSourceManager *self = PHOTOS_SOURCE_MANAGER (user_data);
+
+  self->refresh_mounts_timeout_id = 0;
+  photos_source_manager_refresh_sources (self);
+  return G_SOURCE_REMOVE;
+}
+
+
+static void
+photos_source_manager_remove_refresh_mounts_timeout (PhotosSourceManager *self)
+{
+  if (self->refresh_mounts_timeout_id != 0)
+    {
+      g_source_remove (self->refresh_mounts_timeout_id);
+      self->refresh_mounts_timeout_id = 0;
+    }
+}
+
+
+static void
+photos_source_manager_queue_refresh_mounts (PhotosSourceManager *self)
+{
+  photos_source_manager_remove_refresh_mounts_timeout (self);
+  self->refresh_mounts_timeout_id = g_timeout_add_seconds (REFRESH_MOUNTS_TIMEOUT,
+                                                           photos_source_manager_refresh_mounts_timeout,
+                                                           self);
 }
 
 
@@ -220,19 +315,19 @@ photos_source_manager_goa_client (GObject *source_object, GAsyncResult *res, gpo
       self->client = g_object_ref (client);
       g_signal_connect_swapped (self->client,
                                 "account-added",
-                                G_CALLBACK (photos_source_manager_refresh_accounts),
+                                G_CALLBACK (photos_source_manager_refresh_sources),
                                 self);
       g_signal_connect_swapped (self->client,
                                 "account-changed",
-                                G_CALLBACK (photos_source_manager_refresh_accounts),
+                                G_CALLBACK (photos_source_manager_refresh_sources),
                                 self);
       g_signal_connect_swapped (self->client,
                                 "account-removed",
-                                G_CALLBACK (photos_source_manager_refresh_accounts),
+                                G_CALLBACK (photos_source_manager_refresh_sources),
                                 self);
     }
 
-  photos_source_manager_refresh_accounts (self);
+  photos_source_manager_refresh_sources (self);
 
  out:
   return;
@@ -244,11 +339,14 @@ photos_source_manager_dispose (GObject *object)
 {
   PhotosSourceManager *self = PHOTOS_SOURCE_MANAGER (object);
 
+  photos_source_manager_remove_refresh_mounts_timeout (self);
+
   if (self->cancellable != NULL)
     g_cancellable_cancel (self->cancellable);
 
   g_clear_object (&self->cancellable);
   g_clear_object (&self->client);
+  g_clear_object (&self->volume_monitor);
   g_clear_pointer (&self->sources_notified, (GDestroyNotify) g_hash_table_unref);
 
   G_OBJECT_CLASS (photos_source_manager_parent_class)->dispose (object);
@@ -269,6 +367,24 @@ photos_source_manager_init (PhotosSourceManager *self)
 
   self->cancellable = g_cancellable_new ();
   self->sources_notified = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_object_unref);
+
+  self->volume_monitor = g_volume_monitor_get ();
+  g_signal_connect_object (self->volume_monitor,
+                           "mount-added",
+                           G_CALLBACK (photos_source_manager_queue_refresh_mounts),
+                           self,
+                           G_CONNECT_SWAPPED);
+  g_signal_connect_object (self->volume_monitor,
+                           "mount-changed",
+                           G_CALLBACK (photos_source_manager_queue_refresh_mounts),
+                           self,
+                           G_CONNECT_SWAPPED);
+  g_signal_connect_object (self->volume_monitor,
+                           "mount-removed",
+                           G_CALLBACK (photos_source_manager_queue_refresh_mounts),
+                           self,
+                           G_CONNECT_SWAPPED);
+
   goa_client_new (self->cancellable, photos_source_manager_goa_client, self);
 
   photos_base_manager_set_active_object_by_id (PHOTOS_BASE_MANAGER (self), PHOTOS_SOURCE_STOCK_ALL);