feat: Add configurable timeout to FetchNode

- Add timeout parameter to FetchNode (default: 30 seconds)
- Apply timeout to requests.get() calls to prevent indefinite hangs
- Implement timeout for PDF parsing using ThreadPoolExecutor
- Propagate timeout to ChromiumLoader via loader_kwargs
- Add comprehensive unit tests for timeout functionality
- Fully backward compatible (timeout can be disabled with None)

Fixes issue with requests.get() and PDF parsing blocking indefinitely
on slow/unresponsive servers or large documents.

Usage:
  node_config={'timeout': 30}  # Custom timeout
  node_config={'timeout': None}  # Disable timeout
  node_config={}  # Use default 30s timeout

scrapegraphai/nodes/fetch_node.py

@@ -4,6 +4,7 @@ FetchNode Module
 
 import json
 from typing import List, Optional
+import concurrent.futures
 
 import requests
 from langchain_community.document_loaders import PyPDFLoader
@@ -68,6 +69,10 @@ class FetchNode(BaseNode):
             else node_config.get("openai_md_enabled", False)
         )
 
+        # Timeout in seconds for blocking operations (HTTP requests, PDF parsing, etc.).
+        # If set to None, no timeout will be applied.
+        self.timeout = None if node_config is None else node_config.get("timeout", 30)
+
         self.cut = False if node_config is None else node_config.get("cut", True)
 
         self.browser_base = (
@@ -174,7 +179,19 @@ class FetchNode(BaseNode):
 
         if input_type == "pdf":
             loader = PyPDFLoader(source)
-            return loader.load()
+            # PyPDFLoader.load() can be blocking for large PDFs. Run it in a thread and
+            # enforce the configured timeout if provided.
+            if self.timeout is None:
+                return loader.load()
+            else:
+                with concurrent.futures.ThreadPoolExecutor(max_workers=1) as executor:
+                    future = executor.submit(loader.load)
+                    try:
+                        return future.result(timeout=self.timeout)
+                    except concurrent.futures.TimeoutError:
+                        raise TimeoutError(
+                            f"PDF parsing exceeded timeout of {self.timeout} seconds"
+                        )
         elif input_type == "csv":
             try:
                 import pandas as pd
@@ -260,7 +277,12 @@ class FetchNode(BaseNode):
 
         self.logger.info(f"--- (Fetching HTML from: {source}) ---")
         if self.use_soup:
-            response = requests.get(source)
+            # Apply configured timeout to blocking HTTP requests. If timeout is None,
+            # don't pass the timeout argument (requests will block until completion).
+            if self.timeout is None:
+                response = requests.get(source)
+            else:
+                response = requests.get(source, timeout=self.timeout)
             if response.status_code == 200:
                 if not response.text.strip():
                     raise ValueError("No HTML body content found in the response.")
@@ -286,6 +308,11 @@ class FetchNode(BaseNode):
             if self.node_config:
                 loader_kwargs = self.node_config.get("loader_kwargs", {})
 
+            # If a global timeout is configured on the node and no loader-specific timeout
+            # was provided, propagate it to ChromiumLoader so it can apply the same limit.
+            if "timeout" not in loader_kwargs and self.timeout is not None:
+                loader_kwargs["timeout"] = self.timeout
+
             if self.browser_base:
                 try:
                     from ..docloaders.browser_base import browser_base_fetch

tests/test_fetch_node_timeout.py

@@ -0,0 +1,241 @@
+"""
+Unit tests for FetchNode timeout functionality.
+
+These tests verify that:
+1. The timeout configuration is properly read and stored
+2. HTTP requests use the configured timeout
+3. PDF parsing respects the timeout
+4. Timeout is propagated to ChromiumLoader via loader_kwargs
+"""
+import sys
+import time
+import unittest
+from unittest.mock import Mock, patch, MagicMock
+from pathlib import Path
+
+# Add the project root to path to import modules
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+
+class TestFetchNodeTimeout(unittest.TestCase):
+    """Test suite for FetchNode timeout configuration and usage."""
+
+    def setUp(self):
+        """Set up test fixtures."""
+        # Mock all the heavy external dependencies at import time
+        self.mock_modules = {}
+        for module in ['langchain_core', 'langchain_core.documents', 
+                       'langchain_community', 'langchain_community.document_loaders',
+                       'langchain_openai', 'minify_html', 'pydantic', 
+                       'langchain', 'langchain.prompts']:
+            if module not in sys.modules:
+                sys.modules[module] = MagicMock()
+        
+        # Create mock Document class
+        class MockDocument:
+            def __init__(self, page_content, metadata=None):
+                self.page_content = page_content
+                self.metadata = metadata or {}
+        
+        sys.modules['langchain_core.documents'].Document = MockDocument
+        
+        # Create mock PyPDFLoader
+        class MockPyPDFLoader:
+            def __init__(self, source):
+                self.source = source
+            
+            def load(self):
+                time.sleep(0.1)  # Simulate some work
+                return [MockDocument(page_content=f"PDF content from {self.source}")]
+        
+        sys.modules['langchain_community.document_loaders'].PyPDFLoader = MockPyPDFLoader
+        
+        # Now import FetchNode
+        from scrapegraphai.nodes.fetch_node import FetchNode
+        self.FetchNode = FetchNode
+
+    def tearDown(self):
+        """Clean up after tests."""
+        # Remove mocked modules
+        for module in list(sys.modules.keys()):
+            if 'langchain' in module or module in ['minify_html', 'pydantic']:
+                if module in self.mock_modules or module.startswith('langchain'):
+                    sys.modules.pop(module, None)
+
+    def test_timeout_default_value(self):
+        """Test that default timeout is set to 30 seconds."""
+        node = self.FetchNode(
+            input="url",
+            output=["doc"],
+            node_config={}
+        )
+        self.assertEqual(node.timeout, 30)
+
+    def test_timeout_custom_value(self):
+        """Test that custom timeout value is properly stored."""
+        node = self.FetchNode(
+            input="url",
+            output=["doc"],
+            node_config={"timeout": 10}
+        )
+        self.assertEqual(node.timeout, 10)
+
+    def test_timeout_none_value(self):
+        """Test that timeout can be disabled by setting to None."""
+        node = self.FetchNode(
+            input="url",
+            output=["doc"],
+            node_config={"timeout": None}
+        )
+        self.assertIsNone(node.timeout)
+
+    def test_timeout_no_config(self):
+        """Test that timeout defaults to 30 when no node_config provided."""
+        node = self.FetchNode(
+            input="url",
+            output=["doc"],
+            node_config=None
+        )
+        self.assertEqual(node.timeout, 30)
+
+    @patch('scrapegraphai.nodes.fetch_node.requests')
+    def test_requests_get_with_timeout(self, mock_requests):
+        """Test that requests.get is called with timeout when use_soup=True."""
+        mock_response = Mock()
+        mock_response.status_code = 200
+        mock_response.text = "<html><body>Test content</body></html>"
+        mock_requests.get.return_value = mock_response
+        
+        node = self.FetchNode(
+            input="url",
+            output=["doc"],
+            node_config={"use_soup": True, "timeout": 15}
+        )
+        
+        # Execute with a URL
+        state = {"url": "https://example.com"}
+        node.execute(state)
+        
+        # Verify requests.get was called with timeout
+        mock_requests.get.assert_called_once()
+        call_args = mock_requests.get.call_args
+        self.assertEqual(call_args[1].get('timeout'), 15)
+
+    @patch('scrapegraphai.nodes.fetch_node.requests')
+    def test_requests_get_without_timeout_when_none(self, mock_requests):
+        """Test that requests.get is called without timeout argument when timeout=None."""
+        mock_response = Mock()
+        mock_response.status_code = 200
+        mock_response.text = "<html><body>Test content</body></html>"
+        mock_requests.get.return_value = mock_response
+        
+        node = self.FetchNode(
+            input="url",
+            output=["doc"],
+            node_config={"use_soup": True, "timeout": None}
+        )
+        
+        # Execute with a URL
+        state = {"url": "https://example.com"}
+        node.execute(state)
+        
+        # Verify requests.get was called without timeout
+        mock_requests.get.assert_called_once()
+        call_args = mock_requests.get.call_args
+        self.assertNotIn('timeout', call_args[1])
+
+    def test_pdf_parsing_with_timeout(self):
+        """Test that PDF parsing completes within timeout."""
+        node = self.FetchNode(
+            input="pdf",
+            output=["doc"],
+            node_config={"timeout": 5}
+        )
+        
+        # Execute with a PDF file
+        state = {"pdf": "test.pdf"}
+        result = node.execute(state)
+        
+        # Should complete successfully
+        self.assertIn("doc", result)
+        self.assertIsNotNone(result["doc"])
+
+    def test_pdf_parsing_timeout_exceeded(self):
+        """Test that PDF parsing raises TimeoutError when timeout is exceeded."""
+        # Create a mock loader that takes longer than timeout
+        class SlowPyPDFLoader:
+            def __init__(self, source):
+                self.source = source
+            
+            def load(self):
+                time.sleep(2)  # Sleep longer than timeout
+                return []
+        
+        with patch('scrapegraphai.nodes.fetch_node.PyPDFLoader', SlowPyPDFLoader):
+            node = self.FetchNode(
+                input="pdf",
+                output=["doc"],
+                node_config={"timeout": 0.5}  # Very short timeout
+            )
+            
+            # Execute should raise TimeoutError
+            state = {"pdf": "slow.pdf"}
+            with self.assertRaises(TimeoutError) as context:
+                node.execute(state)
+            
+            self.assertIn("PDF parsing exceeded timeout", str(context.exception))
+
+    @patch('scrapegraphai.nodes.fetch_node.ChromiumLoader')
+    def test_timeout_propagated_to_chromium_loader(self, mock_loader_class):
+        """Test that timeout is propagated to ChromiumLoader via loader_kwargs."""
+        mock_loader = Mock()
+        mock_doc = Mock()
+        mock_doc.page_content = "<html>Test</html>"
+        mock_loader.load.return_value = [mock_doc]
+        mock_loader_class.return_value = mock_loader
+        
+        node = self.FetchNode(
+            input="url",
+            output=["doc"],
+            node_config={"timeout": 20, "headless": True}
+        )
+        
+        # Execute with a URL (not using soup, so ChromiumLoader is used)
+        state = {"url": "https://example.com"}
+        node.execute(state)
+        
+        # Verify ChromiumLoader was instantiated with timeout in kwargs
+        mock_loader_class.assert_called_once()
+        call_kwargs = mock_loader_class.call_args[1]
+        self.assertEqual(call_kwargs.get('timeout'), 20)
+
+    @patch('scrapegraphai.nodes.fetch_node.ChromiumLoader')
+    def test_timeout_not_overridden_in_loader_kwargs(self, mock_loader_class):
+        """Test that existing timeout in loader_kwargs is not overridden."""
+        mock_loader = Mock()
+        mock_doc = Mock()
+        mock_doc.page_content = "<html>Test</html>"
+        mock_loader.load.return_value = [mock_doc]
+        mock_loader_class.return_value = mock_loader
+        
+        node = self.FetchNode(
+            input="url",
+            output=["doc"],
+            node_config={
+                "timeout": 20,
+                "loader_kwargs": {"timeout": 50}  # Explicit loader timeout
+            }
+        )
+        
+        # Execute with a URL
+        state = {"url": "https://example.com"}
+        node.execute(state)
+        
+        # Verify ChromiumLoader got the loader_kwargs timeout, not node timeout
+        mock_loader_class.assert_called_once()
+        call_kwargs = mock_loader_class.call_args[1]
+        self.assertEqual(call_kwargs.get('timeout'), 50)
+
+
+if __name__ == '__main__':
+    unittest.main()