build: make langchain-serve optional

poetry.lock

@@ -5769,7 +5769,7 @@ cffi = {version = ">=1.11", markers = "platform_python_implementation == \"PyPy\
 cffi = ["cffi (>=1.11)"]
 
 [extras]
-production = []
+production = ["langchain-serve"]
 
 [metadata]
 lock-version = "2.0"

pyproject.toml

@@ -51,7 +51,7 @@ websockets = "^11.0.2"
 tiktoken = "^0.3.3"
 wikipedia = "^1.4.0"
 gptcache = "^0.1.23"
-langchain-serve = {version = "^0.0.31", optional = true}
+langchain-serve = { version = "^0.0.31", optional = true }
 
 [tool.poetry.group.dev.dependencies]
 black = "^23.1.0"

src/backend/langflow/__main__.py

@@ -80,7 +80,7 @@ def jcloud():
     import click
 
     try:
-        from lcserve.__main__ import serve_on_jcloud
+        from lcserve.__main__ import serve_on_jcloud  # type: ignore
     except ImportError:
         click.secho(
             "🚨 Please install langchain-serve to deploy Langflow server on Jina AI Cloud using `pip install langchain-serve`",

src/backend/langflow/lcserve.py

@@ -11,4 +11,4 @@ app.mount(
     "/",
     StaticFiles(directory=static_files_dir, html=True),
     name="static",
-)
+)