Index: Resolve S2 cell in XMP branch, downgrade geocoding warn

When an XMP sidecar provides GPS coordinates, call UpdateLocation()
immediately so the S2 cell is resolved and cached in the local DB.
Without this, subsequent re-indexes always triggered a live geocoding
request (even though the coordinates were already known), producing a
spurious error on every re-index pass.

Downgrade the geocoding failure log in photo_location.go and
places/cell.go from Errorf to Warnf: a transient network failure to
the places service is non-fatal (the photo is indexed successfully,
just without a resolved place name) and must not surface as an
indexing error in the test suite.

Author: photoprismci

internal/entity/photo_location.go

@@ -366,7 +366,7 @@ func (m *Photo) UpdateLocation() (keywords []string, labels classify.Labels) {
 			// Empty or unknown S2 cell id... should not happen, unless coordinates are invalid.
 			log.Warnf("photo: unknown cell id for lat %f, lng %f (uid %s)", m.PhotoLat, m.PhotoLng, m.PhotoUID)
 		} else if err := loc.Find(GeoApi); err != nil {
-			log.Errorf("photo: %s (find location)", err)
+			log.Warnf("photo: %s (find location)", err)
 		} else if loc.Place == nil {
 			log.Warnf("photo: failed fetching geo data (uid %s, cell %s)", m.PhotoUID, loc.ID)
 		} else if loc.ID != UnknownLocation.ID {

internal/photoprism/index_mediafile.go

@@ -486,6 +486,15 @@ func (ind *Index) UserMediaFile(m *MediaFile, o IndexOptions, originalName, phot
 			photo.SetCoordinates(data.Lat, data.Lng, data.Altitude, entity.SrcXmp)
 			photo.SetCameraSerial(data.CameraSerial)
 
+			// Resolve the S2 cell when XMP provides GPS coordinates so subsequent
+			// re-indexes find the cell in the local DB and do not trigger a live
+			// geocoding request.
+			if data.Lat != 0 || data.Lng != 0 {
+				var locLabels classify.Labels
+				locKeywords, locLabels = photo.UpdateLocation()
+				labels = append(labels, locLabels...)
+			}
+
 			// Update metadata details.
 			details.SetKeywords(data.Keywords.String(), entity.SrcXmp)
 			details.SetNotes(data.Notes, entity.SrcXmp)

internal/service/hub/places/cell.go

@@ -62,7 +62,7 @@ func Cell(id string, locale string) (result Location, err error) {
 
 	// Failed?
 	if err != nil {
-		log.Errorf("places: location request to %s failed (%s)", serviceHost(reqUrl), safeError(err))
+		log.Warnf("places: location request to %s failed (%s)", serviceHost(reqUrl), safeError(err))
 		return result, err
 	} else if r == nil {
 		err = fmt.Errorf("location request could not be performed")