[Python] (Beta) Async Client (#925)

Co-authored-by: Jake Rachleff <jake@langchain.dev>

python/langsmith/__init__.py

@@ -5,6 +5,7 @@
 if TYPE_CHECKING:
     from langsmith._expect import expect
     from langsmith._testing import test, unit
+    from langsmith.async_client import AsyncClient
     from langsmith.client import Client
     from langsmith.evaluation import aevaluate, evaluate
     from langsmith.evaluation.evaluator import EvaluationResult, RunEvaluator
@@ -33,6 +34,10 @@ def __getattr__(name: str) -> Any:
         from langsmith.client import Client
 
         return Client
+    elif name == "AsyncClient":
+        from langsmith.async_client import AsyncClient
+
+        return AsyncClient
     elif name == "RunTree":
         from langsmith.run_trees import RunTree
 
@@ -118,4 +123,5 @@ def __getattr__(name: str) -> Any:
     "get_tracing_context",
     "get_current_run_tree",
     "ContextThreadPoolExecutor",
+    "AsyncClient",
 ]

python/langsmith/_internal/_beta_decorator.py

@@ -7,12 +7,15 @@ class LangSmithBetaWarning(UserWarning):
     """This is a warning specific to the LangSmithBeta module."""
 
 
+@functools.lru_cache(maxsize=100)
+def _warn_once(message: str) -> None:
+    warnings.warn(message, LangSmithBetaWarning, stacklevel=2)
+
+
 def warn_beta(func: Callable) -> Callable:
     @functools.wraps(func)
     def wrapper(*args, **kwargs):
-        warnings.warn(
-            f"Function {func.__name__} is in beta.", LangSmithBetaWarning, stacklevel=2
-        )
+        _warn_once(f"Function {func.__name__} is in beta.")
         return func(*args, **kwargs)
 
     return wrapper