Merge pull request #16 from msoedov/fix

feat(raise RuntimeError if improperly configured):

langcorn/__main__.py

@@ -1,11 +1,14 @@
+import os
+import sys
+
 import fire
 import uvicorn
-
 from langcorn.server import api
 
 
 class T:
     def server(self, *lc: str, port=8718, auth_token=""):
+        sys.path.append(os.path.dirname(__file__))
         app = api.create_service(*lc, auth_token=auth_token)
         config = uvicorn.Config(app, port=port, log_level="info")
         server = uvicorn.Server(config)

langcorn/server/api.py

@@ -116,7 +116,10 @@ def create_service(*lc_apps, auth_token: str = "", app: FastAPI = None):
     endpoints = ["/docs"]
 
     _authenticate_or_401 = Depends(authenticate_or_401(auth_token=auth_token))
-
+    if lc_apps and isinstance(import_from_string(lc_apps[0]), FastAPI):
+        raise RuntimeError(
+            "Improperly configured: FastAPI instance passed instead of LangChain interface"
+        )
     for lang_app in lc_apps:
         chain = import_from_string(lang_app)
         inn, out = derive_fields(chain)

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langcorn"
-version = "0.0.7"
+version = "0.0.8"
 description = "A Python package creating rest api interface for LangChain"
 authors = ["Alexander Miasoiedov <msoedov@gmail.com>"]
 maintainers = [