feat: deploy langflow using langchain-serve

Makefile

@@ -46,6 +46,17 @@ build:
 	poetry build --format sdist
 	rm -rf src/backend/langflow/frontend
 
+lcserve_push:
+	make build_frontend
+	@version=$$(poetry version --short); \
+	lc-serve push --app langflow.lcserve:app --app-dir . \
+		--image-name langflow --image-tag $${version} \
+		--version deep-0.0.1 --verbose
+
+lcserve_deploy:
+	@:$(if $(uses),,$(error `uses` is not set. Please run `make uses=... lcserve_deploy`))
+	lc-serve deploy jcloud --app langflow.lcserve:app --app-dir . --uses $(uses) --verbose
+
 dev:
 	make install_frontend
 ifeq ($(build),1)

jcloud.yml

@@ -0,0 +1,2 @@
+instance: C4
+autoscale_min: 1

lcserve.Dockerfile

@@ -0,0 +1,16 @@
+# This file is used by `lc-serve` to build the image. 
+# Don't change the name of this file.
+
+FROM jinawolf/serving-gateway:${version}
+
+RUN apt-get update \
+    && apt-get install --no-install-recommends -y build-essential libpq-dev
+
+COPY . /appdir/
+
+RUN pip install poetry==1.4.0 && cd /appdir && pip install . && \
+    pip uninstall -y poetry && \
+    apt-get remove --auto-remove -y build-essential libpq-dev && \
+    apt-get autoremove && apt-get clean && rm -rf /var/lib/apt/lists/* && rm -rf /tmp/*
+
+ENTRYPOINT [ "jina", "gateway", "--uses", "config.yml" ]

src/backend/langflow/__main__.py

@@ -69,6 +69,20 @@ def serve(
         LangflowApplication(app, options).run()
 
 
+@app.command()
+def jcloud():
+    """
+    Deploy Langflow server on Jina AI Cloud
+    """
+    import os
+    from importlib.metadata import version as mod_version
+
+    app_name = "langflow.lcserve:app"
+    version = mod_version("langflow")
+    uses = f"jinaai+docker://langflow:{version}"
+    os.system(f"lc-serve deploy jcloud --app {app_name} --app-dir . --uses {uses}")
+
+
 def main():
     app()
 

src/backend/langflow/lcserve.py

@@ -0,0 +1,14 @@
+# This file is used by lc-serve to load the mounted app and serve it.
+
+from pathlib import Path
+from fastapi.staticfiles import StaticFiles
+from langflow.main import create_app
+
+app = create_app()
+path = Path(__file__).parent
+static_files_dir = path / "frontend"
+app.mount(
+    "/",
+    StaticFiles(directory=static_files_dir, html=True),
+    name="static",
+)