Optimize RAW inspection and add timings v0.8.1

app/static/app.js

@@ -378,7 +378,10 @@ async function readPhotoMetadata(photo, file) {
     try { message = (await response.json()).detail || message; } catch {}
     throw new Error(message);
   }
-  const data = await response.json();
+  applyMetadataResult(photo, await response.json());
+}
+
+function applyMetadataResult(photo, data) {
   photo.metadataLoaded = true;
   photo.metadataPresent = Boolean(data.hasMetadata);
   photo.fileValues = data.hasMetadata ? data.values : null;
@@ -391,6 +394,31 @@ async function readPhotoMetadata(photo, file) {
   }
 }
 
+function base64PreviewUrl(base64, mediaType) {
+  const binary = atob(base64);
+  const bytes = new Uint8Array(binary.length);
+  for (let index = 0; index < binary.length; index += 1) bytes[index] = binary.charCodeAt(index);
+  return URL.createObjectURL(new Blob([bytes], { type: mediaType || 'image/jpeg' }));
+}
+
+async function inspectServerPreviewPhoto(photo, file) {
+  const payload = new FormData();
+  payload.append('file', file, photo.name);
+  const response = await fetch('/api/inspect', { method: 'POST', body: payload });
+  if (!response.ok) {
+    let message = `Photo inspection failed (${response.status}).`;
+    try { message = (await response.json()).detail || message; } catch {}
+    throw new Error(message);
+  }
+  const data = await response.json();
+  const oldUrl = state.thumbUrls.get(photo.name);
+  if (oldUrl) URL.revokeObjectURL(oldUrl);
+  const previewUrl = base64PreviewUrl(data.previewBase64, data.previewMediaType);
+  state.thumbUrls.set(photo.name, previewUrl);
+  applyMetadataResult(photo, data);
+  return previewUrl;
+}
+
 async function selectPhoto(index, force = false) {
   if (index < 0 || index >= state.photos.length || (state.processing && !force)) return;
   captureCurrentValues();
@@ -414,9 +442,17 @@ async function selectPhoto(index, force = false) {
     if (requiresServerPreview(photo)) {
       setSaveStatus('loading', `Rendering ${photo.format} preview…`, photo.name);
     }
-    const previewUrl = await getPreviewUrl(photo, file);
+    const serverInspectionNeeded = requiresServerPreview(photo)
+      && (!state.thumbUrls.has(photo.name) || !photo.metadataLoaded);
+    const previewUrl = serverInspectionNeeded
+      ? await inspectServerPreviewPhoto(photo, file)
+      : await getPreviewUrl(photo, file);
     if (selectionToken !== state.selectionToken || state.currentIndex !== index) return;
     elements.preview.src = previewUrl;
+    if (serverInspectionNeeded) {
+      if (!formHasUserInput() && photo.values) restoreValues(photo.values);
+      updatePhotoStatus(photo);
+    }
     renderFileList();
   } catch (error) {
     if (selectionToken === state.selectionToken && state.currentIndex === index) {
@@ -574,6 +610,8 @@ async function savePhoto(moveNext) {
       payload.append('location_name', values.locationName);
     }
 
+    const saveStarted = performance.now();
+    setSaveStatus('saving', 'Uploading and rewriting metadata…', `${photo.name} · large RAW files can take a while`);
     const response = await fetch('/api/process', { method: 'POST', body: payload });
     if (!response.ok) {
       let message = `Save failed (${response.status}).`;
@@ -582,6 +620,9 @@ async function savePhoto(moveNext) {
     }
 
     const updatedBlob = await response.blob();
+    const serverAndTransferSeconds = (performance.now() - saveStarted) / 1000;
+    setSaveStatus('saving', 'Writing updated file locally…', `${photo.name} · ${serverAndTransferSeconds.toFixed(1)}s processing and transfer`);
+    const localWriteStarted = performance.now();
     const writable = await photo.handle.createWritable({ keepExistingData: false });
     try {
       await writable.write(updatedBlob);
@@ -590,6 +631,7 @@ async function savePhoto(moveNext) {
       await writable.abort().catch(() => {});
       throw error;
     }
+    const localWriteSeconds = (performance.now() - localWriteStarted) / 1000;
 
     const updatedFile = await photo.handle.getFile();
     photo.size = updatedFile.size;
@@ -602,8 +644,12 @@ async function savePhoto(moveNext) {
     photo.metadataLoaded = true;
     photo.metadataPresent = true;
     saveFolderState();
-    setSaveStatus('saved', 'Saved in place', formatMetadataSummary(savedValues));
-    showToast(`Saved ${photo.name}`);
+    setSaveStatus(
+      'saved',
+      'Saved in place',
+      `${formatMetadataSummary(savedValues)} · ${serverAndTransferSeconds.toFixed(1)}s server/transfer · ${localWriteSeconds.toFixed(1)}s local write`,
+    );
+    showToast(`Saved ${photo.name} in ${(serverAndTransferSeconds + localWriteSeconds).toFixed(1)}s`);
     updateProgress();
 
     const oldThumb = state.thumbUrls.get(photo.name);