hammond-gtk: Change utils::get_pixbuf_from_path function to return a Result.

hammond-gtk/src/utils.rs

@@ -73,24 +73,25 @@ lazy_static! {
 // GObjects do not implement Send trait, so SendCell is a way around that.
 // Also lazy_static requires Sync trait, so that's what the mutexes are.
 // TODO: maybe use something that would just scale to requested size?
-pub fn get_pixbuf_from_path(pd: &PodcastCoverQuery, size: u32) -> Option<Pixbuf> {
+pub fn get_pixbuf_from_path(pd: &PodcastCoverQuery, size: u32) -> Result<Pixbuf, Error> {
     {
-        let hashmap = CACHED_PIXBUFS.read().unwrap();
+        let hashmap = CACHED_PIXBUFS
-        let res = hashmap.get(&(pd.id(), size));
+            .read()
-        if let Some(px) = res {
+            .map_err(|_| format_err!("Failed to get a lock on the pixbuf cache mutex."))?;
-            let m = px.lock().unwrap();
+        if let Some(px) = hashmap.get(&(pd.id(), size)) {
-            return Some(m.clone().into_inner());
+            let m = px.lock()
+                .map_err(|_| format_err!("Failed to lock pixbuf mutex."))?;
+            return Ok(m.clone().into_inner());
         }
     }
 
-    let img_path = downloader::cache_image(pd).ok()?;
+    let img_path = downloader::cache_image(pd)?;
-    let px = Pixbuf::new_from_file_at_scale(&img_path, size as i32, size as i32, true).ok();
+    let px = Pixbuf::new_from_file_at_scale(&img_path, size as i32, size as i32, true)?;
-    if let Some(px) = px {
+    let mut hashmap = CACHED_PIXBUFS
-        let mut hashmap = CACHED_PIXBUFS.write().unwrap();
+        .write()
+        .map_err(|_| format_err!("Failed to lock pixbuf mutex."))?;
     hashmap.insert((pd.id(), size), Mutex::new(SendCell::new(px.clone())));
-        return Some(px);
+    Ok(px)
-    }
-    None
 }
 
 #[cfg(test)]
@@ -114,6 +115,6 @@ mod tests {
         // Get the Podcast
         let pd = dbqueries::get_podcast_from_source_id(sid).unwrap();
         let pxbuf = get_pixbuf_from_path(&pd.into(), 256);
-        assert!(pxbuf.is_some());
+        assert!(pxbuf.is_ok());
     }
 }

hammond-gtk/src/views/episodes.rs

@@ -1,4 +1,5 @@
 use chrono::prelude::*;
+use failure::Error;
 use gtk;
 use gtk::prelude::*;
 
@@ -202,18 +203,30 @@ impl EpisodesViewWidget {
             gtk::Builder::new_from_resource("/org/gnome/hammond/gtk/episodes_view_widget.ui");
         let container: gtk::Box = builder.get_object("container").unwrap();
         let image: gtk::Image = builder.get_object("cover").unwrap();
-
-        if let Ok(pd) = dbqueries::get_podcast_cover_from_id(episode.podcast_id()) {
-            get_pixbuf_from_path(&pd, 64).map(|img| image.set_from_pixbuf(&img));
-        }
-
         let ep = EpisodeWidget::new(episode, sender.clone());
-        container.pack_start(&ep.container, true, true, 6);
 
-        EpisodesViewWidget {
+        let view = EpisodesViewWidget {
             container,
             image,
             episode: ep.container,
-        }
+        };
+
+        view.init(episode);
+        view
+    }
+
+    fn init(&self, episode: &mut EpisodeWidgetQuery) {
+        if let Err(err) = self.set_cover(episode) {
+            error!("Failed to set a cover: {}", err)
+        }
+
+        self.container.pack_start(&self.episode, true, true, 6);
+    }
+
+    fn set_cover(&self, episode: &mut EpisodeWidgetQuery) -> Result<(), Error> {
+        let pd = dbqueries::get_podcast_cover_from_id(episode.podcast_id())?;
+        let img = get_pixbuf_from_path(&pd, 64)?;
+        self.image.set_from_pixbuf(&img);
+        Ok(())
     }
 }

hammond-gtk/src/views/shows.rs

@@ -1,3 +1,4 @@
+use failure::Error;
 use gtk;
 use gtk::prelude::*;
 
@@ -114,11 +115,16 @@ impl ShowsChild {
     fn init(&self, pd: &Podcast) {
         self.container.set_tooltip_text(pd.title());
 
-        let cover = get_pixbuf_from_path(&pd.clone().into(), 256);
+        if let Err(err) = self.set_cover(pd) {
-        if let Some(img) = cover {
+            error!("Failed to set a cover: {}", err)
-            self.cover.set_from_pixbuf(&img);
+        }
-        };
 
         WidgetExt::set_name(&self.child, &pd.id().to_string());
     }
+
+    fn set_cover(&self, pd: &Podcast) -> Result<(), Error> {
+        let image = get_pixbuf_from_path(&pd.clone().into(), 256)?;
+        self.cover.set_from_pixbuf(&image);
+        Ok(())
+    }
 }

hammond-gtk/src/widgets/show.rs

@@ -72,9 +72,12 @@ impl ShowWidget {
         }));
 
         self.setup_listbox(pd, sender.clone());
-        self.set_cover(pd);
         self.set_description(pd.description());
 
+        if let Err(err) = self.set_cover(pd) {
+            error!("Failed to set a cover: {}", err)
+        }
+
         let link = pd.link().to_owned();
         self.link.set_tooltip_text(Some(link.as_str()));
         self.link.connect_clicked(move |_| {
@@ -91,11 +94,11 @@ impl ShowWidget {
         let listbox = episodes_listbox(pd, sender.clone());
         listbox.ok().map(|l| self.episodes.add(&l));
     }
-
     /// Set the show cover.
-    fn set_cover(&self, pd: &Podcast) {
+    fn set_cover(&self, pd: &Podcast) -> Result<(), Error> {
-        let img = get_pixbuf_from_path(&pd.clone().into(), 128);
+        let image = get_pixbuf_from_path(&pd.clone().into(), 128)?;
-        img.map(|i| self.cover.set_from_pixbuf(&i));
+        self.cover.set_from_pixbuf(&image);
+        Ok(())
     }
 
     /// Set the descripton text.