local import of ocrmypdf so that the webserver does not load that

src/paperless_tesseract/parsers.py

@@ -2,12 +2,8 @@
 import os
 import re
 
-import ocrmypdf
-import pdftotext
-import pikepdf
 from PIL import Image
 from django.conf import settings
-from ocrmypdf import InputFileError, EncryptedPdfError
 
 from documents.parsers import DocumentParser, ParseError, \
     make_thumbnail_from_pdf
@@ -22,6 +18,8 @@ class RasterisedDocumentParser(DocumentParser):
     logging_name = "paperless.parsing.tesseract"
 
     def extract_metadata(self, document_path, mime_type):
+        import pikepdf
+
         namespace_pattern = re.compile(r"\{(.*)\}(.*)")
 
         result = []
@@ -91,6 +89,9 @@ def calculate_a4_dpi(self, image):
             return None
 
     def parse(self, document_path, mime_type, file_name=None):
+        import ocrmypdf
+        from ocrmypdf import InputFileError, EncryptedPdfError
+
         mode = settings.OCR_MODE
 
         text_original = get_text_from_pdf(document_path)
@@ -223,6 +224,7 @@ def strip_excess_whitespace(text):
 
 
 def get_text_from_pdf(pdf_file):
+    import pdftotext
 
     if not os.path.isfile(pdf_file):
         return None

src/paperless_tesseract/tests/test_parser.py

@@ -164,17 +164,12 @@ def f():
 
         self.assertRaises(ParseError, f)
 
-    @mock.patch("paperless_tesseract.parsers.ocrmypdf.ocr")
-    def test_image_calc_a4_dpi(self, m):
+    def test_image_calc_a4_dpi(self):
         parser = RasterisedDocumentParser(None)
 
-        parser.parse(os.path.join(self.SAMPLE_FILES, "simple-no-dpi.png"), "image/png")
-
-        m.assert_called_once()
-
-        args, kwargs = m.call_args
+        dpi = parser.calculate_a4_dpi(os.path.join(self.SAMPLE_FILES, "simple-no-dpi.png"))
 
-        self.assertEqual(kwargs['image_dpi'], 62)
+        self.assertEqual(dpi, 62)
 
     @mock.patch("paperless_tesseract.parsers.RasterisedDocumentParser.calculate_a4_dpi")
     def test_image_dpi_fail(self, m):