Speed up dicom adjacent file detection when it doesn't succeed

CHANGELOG.md

@@ -5,7 +5,7 @@
 ### Improvements
 - Read config values from the environment variables ([#1422](../../pull/1422))
 - Optimizing when reading arrays rather than images from tiff files ([#1423](../../pull/1423))
-- Better filter DICOM adjacent files to ensure they share series instance IDs ([#1424](../../pull/1424))
+- Better filter DICOM adjacent files to ensure they share series instance IDs ([#1424](../../pull/1424), [#1436](../../pull/1436))
 - Optimizing small getRegion calls and some tiff tile fetches ([#1427](../../pull/1427))
 - Started adding python types to the core library ([#1432](../../pull/1432), [#1433](../../pull/1433))
 - Use parallelism in computing tile frames ([#1434](../../pull/1434))

sources/dicom/large_image_source_dicom/__init__.py

@@ -242,9 +242,12 @@ def _pathMightBeDicom(self, path, basepath=None):
         if mightbe and basepath:
             try:
                 _lazyImportPydicom()
-                base_series_uid = pydicom.filereader.dcmread(
-                    basepath, stop_before_pixels=True,
-                )[pydicom.tag.Tag('SeriesInstanceUID')].value
+                base = pydicom.filereader.dcmread(basepath, stop_before_pixels=True)
+            except Exception as exc:
+                msg = f'File cannot be opened via dicom tile source ({exc}).'
+                raise TileSourceError(msg)
+            try:
+                base_series_uid = base[pydicom.tag.Tag('SeriesInstanceUID')].value
             except Exception:
                 base_series_uid = None
             if base_series_uid:

tox.ini

@@ -90,7 +90,7 @@ deps =
 allowlist_externals = {[testenv:test]allowlist_externals}
 commands =
   rm -rf build/test/coverage/web_temp
-  rm ./monkeytype.sqlite3
+  -rm ./monkeytype.sqlite3
   girder build --dev
   pytest --numprocesses 0 -m 'not notebook' --no-cov --suppress-no-test-exit-code --monkeytype-output=./monkeytype.sqlite3 {posargs}
   - npx nyc report --temp-dir build/test/coverage/web_temp --report-dir build/test/coverage --reporter cobertura --reporter text-summary