From 1e40427755f3034c5c411c1d0a921cdb3e13849d Mon Sep 17 00:00:00 2001
From: Nuno Campos <nuno@boringbits.io>
Date: Fri, 14 Jul 2023 10:03:16 +0100
Subject: [PATCH] Enabled nesting chain group (#7697)

<!-- Thank you for contributing to LangChain!

Replace this comment with:
  - Description: a description of the change,
  - Issue: the issue # it fixes (if applicable),
  - Dependencies: any dependencies required for this change,
- Tag maintainer: for a quicker response, tag the relevant maintainer
(see below),
- Twitter handle: we announce bigger features on Twitter. If your PR
gets announced and you'd like a mention, we'll gladly shout you out!

If you're adding a new integration, please include:
1. a test for the integration, preferably unit tests that do not rely on
network access,
  2. an example notebook showing its use.

Maintainer responsibilities:
  - General / Misc / if you don't know who to tag: @baskaryan
  - DataLoaders / VectorStores / Retrievers: @rlancemartin, @eyurtsev
  - Models / Prompts: @hwchase17, @baskaryan
  - Memory: @hwchase17
  - Agents / Tools / Toolkits: @hinthornw
  - Tracing / Callbacks: @agola11
  - Async: @agola11

If no one reviews your PR within a few days, feel free to @-mention the
same people again.

See contribution guidelines for more information on how to write/run
tests, lint, etc:
https://github.com/hwchase17/langchain/blob/master/.github/CONTRIBUTING.md
 -->
---
 langchain/callbacks/manager.py | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/langchain/callbacks/manager.py b/langchain/callbacks/manager.py
index bd0aa12632..b40afcaaef 100644
--- a/langchain/callbacks/manager.py
+++ b/langchain/callbacks/manager.py
@@ -177,6 +177,7 @@ def tracing_v2_enabled(
 @contextmanager
 def trace_as_chain_group(
     group_name: str,
+    callback_manager: Optional[CallbackManager] = None,
     *,
     project_name: Optional[str] = None,
     example_id: Optional[Union[str, UUID]] = None,
@@ -203,12 +204,19 @@ def trace_as_chain_group(
         ...     # Use the callback manager for the chain group
         ...     llm.predict("Foo", callbacks=manager)
     """
-    cb = LangChainTracer(
-        project_name=project_name,
-        example_id=example_id,
+    cb = cast(
+        Callbacks,
+        [
+            LangChainTracer(
+                project_name=project_name,
+                example_id=example_id,
+            )
+        ]
+        if callback_manager is None
+        else callback_manager,
     )
     cm = CallbackManager.configure(
-        inheritable_callbacks=[cb],
+        inheritable_callbacks=cb,
         inheritable_tags=tags,
     )
 
@@ -220,6 +228,7 @@ def trace_as_chain_group(
 @asynccontextmanager
 async def atrace_as_chain_group(
     group_name: str,
+    callback_manager: Optional[AsyncCallbackManager] = None,
     *,
     project_name: Optional[str] = None,
     example_id: Optional[Union[str, UUID]] = None,
@@ -245,13 +254,18 @@ async def atrace_as_chain_group(
         ...     # Use the async callback manager for the chain group
         ...     await llm.apredict("Foo", callbacks=manager)
     """
-    cb = LangChainTracer(
-        project_name=project_name,
-        example_id=example_id,
-    )
-    cm = AsyncCallbackManager.configure(
-        inheritable_callbacks=[cb], inheritable_tags=tags
+    cb = cast(
+        Callbacks,
+        [
+            LangChainTracer(
+                project_name=project_name,
+                example_id=example_id,
+            )
+        ]
+        if callback_manager is None
+        else callback_manager,
     )
+    cm = AsyncCallbackManager.configure(inheritable_callbacks=cb, inheritable_tags=tags)
 
     run_manager = await cm.on_chain_start({"name": group_name}, {})
     try: