fix: Adds graceful handling quick fix for damaged pdf files (#1047)

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## Description
fix: Adds graceful handling quick fix for damaged pdf files

## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin.

cognee/modules/data/processing/document_types/PdfDocument.py

@@ -2,6 +2,10 @@ from pypdf import PdfReader
 from cognee.modules.chunking.Chunker import Chunker
 from .open_data_file import open_data_file
 from .Document import Document
+from cognee.shared.logging_utils import get_logger
+from cognee.modules.data.processing.document_types.exceptions.exceptions import PyPdfInternalError
+
+logger = get_logger("PDFDocument")
 
 
 class PdfDocument(Document):
@@ -9,12 +13,19 @@ class PdfDocument(Document):
 
     def read(self, chunker_cls: Chunker, max_chunk_size: int):
         with open_data_file(self.raw_data_location, mode="rb") as stream:
-            file = PdfReader(stream)
+            logger.info(f"Reading PDF:{self.raw_data_location}")
+            try:
+                file = PdfReader(stream, strict=False)
+            except Exception:
+                raise PyPdfInternalError()
 
             def get_text():
-                for page in file.pages:
-                    page_text = page.extract_text()
-                    yield page_text
+                try:
+                    for page in file.pages:
+                        page_text = page.extract_text()
+                        yield page_text
+                except Exception:
+                    raise PyPdfInternalError()
 
             chunker = chunker_cls(self, get_text=get_text, max_chunk_size=max_chunk_size)
 

cognee/modules/data/processing/document_types/exceptions/__init__.py

@@ -0,0 +1,7 @@
+"""
+Custom exceptions for the Cognee API.
+
+This module defines a set of exceptions for the different document types
+"""
+
+from .exceptions import PyPdfInternalError

cognee/modules/data/processing/document_types/exceptions/exceptions.py

@@ -0,0 +1,14 @@
+from cognee.exceptions import CogneeApiError
+from fastapi import status
+
+
+class PyPdfInternalError(CogneeApiError):
+    """Internal pypdf error"""
+
+    def __init__(
+        self,
+        message: str = "Error during PyPdf processing. Pdf is damaged or cannot be processed.",
+        name: str = "PyPdfInternalError",
+        status_code=status.WS_1011_INTERNAL_ERROR,
+    ):
+        super().__init__(message, name, status_code)

cognee/tasks/documents/extract_chunks_from_documents.py

@@ -1,5 +1,6 @@
 from typing import AsyncGenerator
 
+from cognee.shared.logging_utils import get_logger
 from cognee.modules.data.processing.document_types.Document import Document
 from sqlalchemy import select
 from cognee.modules.data.models import Data
@@ -7,6 +8,7 @@ from cognee.infrastructure.databases.relational import get_relational_engine
 from uuid import UUID
 from cognee.modules.chunking.TextChunker import TextChunker
 from cognee.modules.chunking.Chunker import Chunker
+from cognee.modules.data.processing.document_types.exceptions.exceptions import PyPdfInternalError
 
 
 async def update_document_token_count(document_id: UUID, token_count: int) -> None:
@@ -38,10 +40,13 @@ async def extract_chunks_from_documents(
     """
     for document in documents:
         document_token_count = 0
-        for document_chunk in document.read(max_chunk_size=max_chunk_size, chunker_cls=chunker):
-            document_token_count += document_chunk.chunk_size
-            document_chunk.belongs_to_set = document.belongs_to_set
-            yield document_chunk
+        try:
+            for document_chunk in document.read(max_chunk_size=max_chunk_size, chunker_cls=chunker):
+                document_token_count += document_chunk.chunk_size
+                document_chunk.belongs_to_set = document.belongs_to_set
+                yield document_chunk
 
-        await update_document_token_count(document.id, document_token_count)
+            await update_document_token_count(document.id, document_token_count)
+        except PyPdfInternalError:
+            pass
         # todo rita