refactor: improve logging

plugins/png_to_jpeg.rs

@@ -13,13 +13,15 @@
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 use crate::plugin::Plugin;
-use image::ImageFormat;
-use std::io::Cursor;
-use std::path::Path;
 
 pub struct PluginImpl;
 
 impl Plugin for PluginImpl {
+    #[tracing::instrument(skip(self))]
+    fn is_available(&self) -> bool {
+        tracing::trace!("Checking availability for png_to_jpeg plugin (always true)");
+        true
+    }
     fn name(&self) -> &'static str {
         "png_to_jpeg"
     }
@@ -39,18 +41,34 @@ impl Plugin for PluginImpl {
         220
     }
 
+    #[tracing::instrument(skip(self, input, _temp_dir))]
     fn convert(
         &self,
         input: &[u8],
         _from: &str,
         _to: &str,
-        _temp_dir: &Path,
+        _temp_dir: &std::path::Path,
     ) -> Result<Vec<u8>, String> {
-        let img = image::load_from_memory_with_format(input, ImageFormat::Png)
-            .map_err(|e| e.to_string())?;
-        let mut buf = Vec::new();
-        img.write_to(&mut Cursor::new(&mut buf), ImageFormat::Jpeg)
-            .map_err(|e| e.to_string())?;
-        Ok(buf)
+        tracing::debug!("png_to_jpeg starting conversion");
+        tracing::trace!("Loading PNG image from memory ({} bytes)", input.len());
+        let img = image::load_from_memory_with_format(input, image::ImageFormat::Png)
+            .map_err(|e| {
+                tracing::error!("Failed to decode PNG image: {}", e);
+                e.to_string()
+            })?;
+
+        tracing::trace!("PNG image loaded successfully. Dimensions: {}x{}", img.width(), img.height());
+
+        let mut output = std::io::Cursor::new(Vec::new());
+        tracing::trace!("Encoding image as JPEG");
+        img.write_to(&mut output, image::ImageFormat::Jpeg)
+            .map_err(|e| {
+                tracing::error!("Failed to encode image as JPEG: {}", e);
+                e.to_string()
+            })?;
+
+        let out_bytes = output.into_inner();
+        tracing::debug!("png_to_jpeg conversion completed. Output size: {} bytes", out_bytes.len());
+        Ok(out_bytes)
     }
 }