Add test for handling of bad xrefs

config.yaml

@@ -3,7 +3,7 @@ webserver:
   port: $SERVER_PORT|5000  # webserver port
 
 service:
-  logging_level: $LOGGING_LEVEL_ROOT|INFO  # Logging level for service logger
+  logging_level: $LOGGING_LEVEL_ROOT|DEBUG  # Logging level for service logger
   verbose: $VERBOSE|True  # Service prints document processing progress to stdout
   batch_size: $BATCH_SIZE|16  # Number of images in memory simultaneously
   mlflow_run_id: $MLFLOW_RUN_ID|fabfb1f192c745369b88cab34471aba7  # The ID of the mlflow run to load the service_estimator from

image_prediction/exceptions.py

@@ -36,3 +36,7 @@ class InvalidBox(Exception):
 
 class ParsingError(Exception):
     pass
+
+
+class BadXref(ValueError):
+    pass

image_prediction/image_extractor/extractors/parsable.py

@@ -12,7 +12,7 @@ import numpy as np
 from PIL import Image
 from funcy import merge, compose, rcompose, keep
 
-from image_prediction.exceptions import InvalidBox
+from image_prediction.exceptions import InvalidBox, BadXref
 from image_prediction.formatter.formatters.enum import EnumFormatter
 from image_prediction.image_extractor.extractor import ImageExtractor, ImageMetadataPair
 from image_prediction.info import Info
@@ -118,23 +118,29 @@ def get_metadata_for_images_on_page(page: fitz.Page):
 
 @lru_cache(maxsize=None)
 def xref_to_maybe_image(doc, xref) -> Union[Image.Image, None]:
-    def extrac_image(xref):
-        pixmap = fitz.Pixmap(doc, xref)
-        array = np.frombuffer(pixmap.samples, dtype=np.uint8).reshape(pixmap.h, pixmap.w, pixmap.n)
-        array = normalize_channels(array)
-        return Image.fromarray(array)
-
     try:
-        return extrac_image(xref)
-    except ValueError:
-        logger.debug(f"Xref {xref} is invalid, skipping extraction ...")
-        return
+        return extract_image(doc, xref)
+    except BadXref:
+        return None
 
 
 def make_maybe_image_metadata_pair(image, metadata):
     return ImageMetadataPair(image, metadata) if image and metadata else None
 
 
+def extract_image(doc, xref) -> Image.Image:
+    try:
+        pixmap = fitz.Pixmap(doc, xref)
+    except ValueError as err:
+        msg = f"Xref {xref} is invalid, skipping extraction ..."
+        logger.debug(msg)
+        raise BadXref(msg) from err
+
+    array = np.frombuffer(pixmap.samples, dtype=np.uint8).reshape((pixmap.h, pixmap.w, pixmap.n))
+    array = normalize_channels(array)
+    return Image.fromarray(array)
+
+
 def has_alpha_channel(doc, xref):
 
     maybe_image = load_image_handle_from_xref(doc, xref)

image_prediction/locations.py

@@ -3,15 +3,14 @@
 from pathlib import Path
 
 MODULE_DIR = Path(__file__).resolve().parents[0]
-
 PACKAGE_ROOT_DIR = MODULE_DIR.parents[0]
 
 CONFIG_FILE = PACKAGE_ROOT_DIR / "config.yaml"
-
 BANNER_FILE = PACKAGE_ROOT_DIR / "banner.txt"
 
 DATA_DIR = PACKAGE_ROOT_DIR / "data"
-
 MLRUNS_DIR = str(DATA_DIR / "mlruns")
 
-TEST_DATA_DIR = PACKAGE_ROOT_DIR / "test" / "data"
+TEST_DIR = PACKAGE_ROOT_DIR / "test"
+TEST_DATA_DIR = TEST_DIR / "data"
+TEST_DATA_DIR_DVC = TEST_DIR / "data.dvc"