langchain[patch]: Migrate utils to use optional langchain_community (#21163)

Migrate utils to use optional imports from langchain community

libs/langchain/langchain/utils/ernie_functions.py

@@ -1,9 +1,32 @@
-from langchain_community.utils.ernie_functions import (
+from typing import TYPE_CHECKING, Any
-    FunctionDescription,
+
-    ToolDescription,
+from langchain._api import create_importer
-    convert_pydantic_to_ernie_function,
+
-    convert_pydantic_to_ernie_tool,
+if TYPE_CHECKING:
-)
+    from langchain_community.utils.ernie_functions import (
+        FunctionDescription,
+        ToolDescription,
+        convert_pydantic_to_ernie_function,
+        convert_pydantic_to_ernie_tool,
+    )
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {
+    "FunctionDescription": "langchain_community.utils.ernie_functions",
+    "ToolDescription": "langchain_community.utils.ernie_functions",
+    "convert_pydantic_to_ernie_function": "langchain_community.utils.ernie_functions",
+    "convert_pydantic_to_ernie_tool": "langchain_community.utils.ernie_functions",
+}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
 
 __all__ = [
     "FunctionDescription",

libs/langchain/langchain/utils/openai.py

@@ -1,3 +1,23 @@
-from langchain_community.utils.openai import is_openai_v1
+from typing import TYPE_CHECKING, Any
 
-__all__ = ["is_openai_v1"]
+from langchain._api import create_importer
+
+if TYPE_CHECKING:
+    from langchain_community.utils.openai import is_openai_v1
+
+# Create a way to dynamically look up deprecated imports.
+# Used to consolidate logic for raising deprecation warnings and
+# handling optional imports.
+DEPRECATED_LOOKUP = {"is_openai_v1": "langchain_community.utils.openai"}
+
+_import_attribute = create_importer(__package__, deprecated_lookups=DEPRECATED_LOOKUP)
+
+
+def __getattr__(name: str) -> Any:
+    """Look up attributes dynamically."""
+    return _import_attribute(name)
+
+
+__all__ = [
+    "is_openai_v1",
+]