Revert "Enabled dependency isolation by default (#1055)"

This reverts commit b1085b5.

Author: peterstone2017

azure_functions_worker/constants.py

@@ -43,7 +43,8 @@
 PYTHON_THREADPOOL_THREAD_COUNT_MAX = sys.maxsize
 PYTHON_THREADPOOL_THREAD_COUNT_MAX_37 = 32
 
-PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT = True
+PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT = False
+PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT_310 = False
 PYTHON_ENABLE_WORKER_EXTENSIONS_DEFAULT = False
 PYTHON_ENABLE_WORKER_EXTENSIONS_DEFAULT_39 = True
 

azure_functions_worker/utils/dependency.py

@@ -1,21 +1,21 @@
-# Copyright (c) Microsoft Corporation. All rights reserved.
-# Licensed under the MIT License.
+from azure_functions_worker.utils.common import is_true_like
+from typing import List, Optional
+from types import ModuleType
 import importlib
 import inspect
 import os
 import re
 import sys
-from types import ModuleType
-from typing import List, Optional
 
-from azure_functions_worker.utils.common import is_true_like
+from ..logging import logger
 from ..constants import (
     AZURE_WEBJOBS_SCRIPT_ROOT,
     CONTAINER_NAME,
     PYTHON_ISOLATE_WORKER_DEPENDENCIES,
-    PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT
+    PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT,
+    PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT_310
 )
-from ..logging import logger
+from ..utils.common import is_python_version
 from ..utils.wrappers import enable_feature_by
 
 
@@ -75,7 +75,12 @@ def is_in_linux_consumption(cls):
     @classmethod
     @enable_feature_by(
         flag=PYTHON_ISOLATE_WORKER_DEPENDENCIES,
-        flag_default=PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT)
+        flag_default=(
+            PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT_310 if
+            is_python_version('3.10') else
+            PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT
+        )
+    )
     def use_worker_dependencies(cls):
         """Switch the sys.path and ensure the worker imports are loaded from
         Worker's dependenciess.
@@ -101,7 +106,12 @@ def use_worker_dependencies(cls):
     @classmethod
     @enable_feature_by(
         flag=PYTHON_ISOLATE_WORKER_DEPENDENCIES,
-        flag_default=PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT)
+        flag_default=(
+            PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT_310 if
+            is_python_version('3.10') else
+            PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT
+        )
+    )
     def prioritize_customer_dependencies(cls, cx_working_dir=None):
         """Switch the sys.path and ensure the customer's code import are loaded
         from CX's deppendencies.
@@ -170,7 +180,11 @@ def reload_customer_libraries(cls, cx_working_dir: str):
         """
         use_new_env = os.getenv(PYTHON_ISOLATE_WORKER_DEPENDENCIES)
         if use_new_env is None:
-            use_new = PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT
+            use_new = (
+                PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT_310 if
+                is_python_version('3.10') else
+                PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT
+            )
         else:
             use_new = is_true_like(use_new_env)
 

tests/endtoend/dependency_isolation_functions/dependency_isolation_stein/function_app.py

@@ -8,6 +8,7 @@
 import unittest
 
 from azure_functions_worker import protos, testutils
+from azure_functions_worker.utils.common import is_python_version
 
 
 class TestGRPC(testutils.AsyncTestCase):
@@ -126,7 +127,13 @@ def test_failed_azure_namespace_import(self):
 
     @unittest.skipIf(sys.platform == 'win32',
                      'Linux .sh script only works on Linux')
+    @unittest.skipIf(
+        is_python_version('3.10'),
+        'In Python 3.10, isolate worker dependencies is turned on by default.'
+        ' Reloading all customer dependencies on specialization is a must.'
+        ' This partially reloading namespace feature is no longer needed.'
+    )
     def test_successful_azure_namespace_import(self):
         self._verify_azure_namespace_import(
             'true',
-            'module_b fails to import')
+            'module_b is imported')

tests/unittests/test_rpc_messages.py

@@ -1,12 +1,13 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # Licensed under the MIT License.
-import importlib.util
 import os
 import sys
+import importlib.util
 import unittest
 from unittest.mock import patch
 
 from azure_functions_worker import testutils
+from azure_functions_worker.utils.common import is_python_version
 from azure_functions_worker.utils.dependency import DependencyManager
 
 
@@ -228,7 +229,7 @@ def test_add_to_sys_path_no_duplication(self):
 
     def test_add_to_sys_path_import_module(self):
         DependencyManager._add_to_sys_path(self._customer_deps_path, True)
-        import common_module  # NoQA
+        import common_module # NoQA
         self.assertEqual(
             common_module.package_location,
             os.path.join(self._customer_deps_path, 'common_module')
@@ -239,7 +240,7 @@ def test_add_to_sys_path_import_namespace_path(self):
         into sys.path
         """
         DependencyManager._add_to_sys_path(self._customer_deps_path, True)
-        import common_namespace  # NoQA
+        import common_namespace # NoQA
         self.assertEqual(len(common_namespace.__path__), 1)
         self.assertEqual(
             common_namespace.__path__[0],
@@ -516,7 +517,7 @@ def test_clear_path_importer_cache_and_modules_retain_namespace(self):
         sys.path.insert(0, self._worker_deps_path)
 
         # Ensure new import is from _worker_deps_path
-        import common_module as worker_mod  # NoQA
+        import common_module as worker_mod # NoQA
         self.assertIn('common_module', sys.modules)
         self.assertEqual(
             worker_mod.package_location,
@@ -554,6 +555,39 @@ def test_use_worker_dependencies_disable(self):
         with self.assertRaises(ImportError):
             import common_module  # NoQA
 
+    @unittest.skipUnless(
+        sys.version_info.major == 3 and sys.version_info.minor != 10,
+        'Test only available for Python 3.6, 3.7, 3.8 or 3.9'
+    )
+    def test_use_worker_dependencies_default_python_36_37_38_39(self):
+        # Feature should be disabled in Python 3.6, 3.7, 3.8 and 3.9
+        # Setup paths
+        DependencyManager.worker_deps_path = self._worker_deps_path
+        DependencyManager.cx_deps_path = self._customer_deps_path
+        DependencyManager.cx_working_dir = self._customer_func_path
+
+        # The common_module cannot be imported since feature is disabled
+        DependencyManager.use_worker_dependencies()
+        with self.assertRaises(ImportError):
+            import common_module  # NoQA
+
+    @unittest.skip('Skipping since PYTHON_ISOLATE_WORKER_DEPENDENCIES is '
+                   'disabled by default')
+    def test_use_worker_dependencies_default_python_310(self):
+        # Feature should be enabled in Python 3.10 by default
+        # Setup paths
+        DependencyManager.worker_deps_path = self._worker_deps_path
+        DependencyManager.cx_deps_path = self._customer_deps_path
+        DependencyManager.cx_working_dir = self._customer_func_path
+
+        # Ensure the common_module is imported from _worker_deps_path
+        DependencyManager.use_worker_dependencies()
+        import common_module  # NoQA
+        self.assertEqual(
+            common_module.package_location,
+            os.path.join(self._worker_deps_path, 'common_module')
+        )
+
     def test_prioritize_customer_dependencies(self):
         # Setup app settings
         os.environ['PYTHON_ISOLATE_WORKER_DEPENDENCIES'] = 'true'
@@ -592,51 +626,52 @@ def test_prioritize_customer_dependencies_disable(self):
         with self.assertRaises(ImportError):
             import common_module  # NoQA
 
-    def test_prioritize_customer_dependencies_from_working_directory(self):
-        self._initialize_scenario()
-
+    @unittest.skipIf(is_python_version('3.10'),
+                     'Test not available for python 3.10')
+    def test_prioritize_customer_dependencies_default_python_36_37_38_39(self):
+        # Feature should be disabled in Python 3.6, 3.7, 3.8 and 3.9
         # Setup paths
         DependencyManager.worker_deps_path = self._worker_deps_path
         DependencyManager.cx_deps_path = self._customer_deps_path
         DependencyManager.cx_working_dir = self._customer_func_path
 
-        # Ensure the func_specific_module is imported from _customer_func_path
+        # Ensure the common_module is imported from _customer_deps_path
         DependencyManager.prioritize_customer_dependencies()
-        import func_specific_module  # NoQA
-        self.assertEqual(
-            func_specific_module.package_location,
-            os.path.join(self._customer_func_path, 'func_specific_module')
-        )
+        with self.assertRaises(ImportError):
+            import common_module  # NoQA
 
-    def test_reload_customer_libraries_dependency_isolation_true(self):
-        os.environ['PYTHON_ISOLATE_WORKER_DEPENDENCIES'] = 'true'
+    @unittest.skip('Skipping since PYTHON_ISOLATE_WORKER_DEPENDENCIES is '
+                   'disabled by default')
+    def test_prioritize_customer_dependencies_default_python_310(self):
+        # Feature should be enabled in Python 3.10 by default
         # Setup paths
         DependencyManager.worker_deps_path = self._worker_deps_path
         DependencyManager.cx_deps_path = self._customer_deps_path
         DependencyManager.cx_working_dir = self._customer_func_path
 
-        DependencyManager.reload_customer_libraries(self._customer_deps_path)
+        # Ensure the common_module is imported from _customer_deps_path
+        DependencyManager.prioritize_customer_dependencies()
         import common_module  # NoQA
         self.assertEqual(
             common_module.package_location,
-            os.path.join(self._customer_deps_path, 'common_module'))
+            os.path.join(self._customer_deps_path, 'common_module')
+        )
+
+    def test_prioritize_customer_dependencies_from_working_directory(self):
+        self._initialize_scenario()
 
-    def test_reload_customer_libraries_dependency_isolation_false(self):
-        os.environ['PYTHON_ISOLATE_WORKER_DEPENDENCIES'] = 'false'
         # Setup paths
         DependencyManager.worker_deps_path = self._worker_deps_path
         DependencyManager.cx_deps_path = self._customer_deps_path
         DependencyManager.cx_working_dir = self._customer_func_path
 
-        DependencyManager._add_to_sys_path(self._worker_deps_path, True)
-        import azure.functions  # NoQA
-
-        DependencyManager._add_to_sys_path(self._customer_deps_path, True)
-        DependencyManager.reload_customer_libraries(self._customer_deps_path)
-        # Checking if azure.functions gets reloaded
-        self.assertIn(
-            os.path.join(self._customer_deps_path, 'azure', 'functions'),
-            sys.modules['azure.functions'].__path__)
+        # Ensure the func_specific_module is imported from _customer_func_path
+        DependencyManager.prioritize_customer_dependencies()
+        import func_specific_module  # NoQA
+        self.assertEqual(
+            func_specific_module.package_location,
+            os.path.join(self._customer_func_path, 'func_specific_module')
+        )
 
     def test_remove_module_cache(self):
         # First import the common_module and create a sys.modules cache