Langflow run command not working as static_files_dir error

[mirzasreza]

I have cloned zustand/io/migration branch.
I am getting this error while i run langflow run after poetry install.

RuntimeError: Static files directory /mnt/d/build/wLang/langflow7/src/backend/langflow/frontend does not exist.
basically, the program generating wrong static_files_dir

[dosubot]

Hey @mirzasreza, back at it with another twist in the Langflow saga, I see! Good to have you here. 🚀

Based on the error message you provided, it seems like the application is unable to find the static files directory at the specified path (/mnt/d/build/wLang/langflow7/src/backend/langflow/frontend). This could be due to a couple of reasons:

1. The directory does not exist: Please ensure that the directory /mnt/d/build/wLang/langflow7/src/backend/langflow/frontend actually exists and contains the necessary static files. If the directory does not exist, you will need to create it and populate it with the necessary static files.

2. The directory path is not correctly specified in the application code: The Langflow project has a specific setup for serving static files in its application code. This setup is defined in the setup_static_files function, which mounts a directory for static files to the FastAPI application and configures a custom 404 handler to serve index.html for any not found routes. The setup_static_files function takes two parameters: app, which is the FastAPI application instance, and static_files_dir, which is the path to the directory containing the static files. If the static_files_dir is not correctly specified in the setup_app function, you will encounter this error. Please ensure that the static_files_dir is correctly specified in the setup_app function.

Here is the relevant code snippet for serving static files:

def setup_static_files(app: FastAPI, static_files_dir: Path):
    app.mount(
        "/",
        StaticFiles(directory=static_files_dir, html=True),
        name="static",
    )

    @app.exception_handler(404)
    async def custom_404_handler(request, __):
        path = static_files_dir / "index.html"
        if not path.exists():
            raise RuntimeError(f"File at path {path} does not exist.")
        return FileResponse(path)

You can find this code in the main.py file in the src/backend/langflow directory.

If you've checked both of these possibilities and are still encountering the error, it would be helpful if you could provide more information about your setup. Specifically, the contents of your pyproject.toml file and the exact command you're using to run Langflow would be useful.

Sources

• pyproject.toml
• src/backend/langflow/main.py

About Dosu

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[mirzasreza]

@dosubot i copied frontend folder to specified location it was looking. But when I run and open browser it shows me blank.

[dosubot]

Based on the information you've provided, it seems like the issue might be related to the static files not being served correctly. The setup_app function in main.py is responsible for setting up the FastAPI application and serving static files if the backend_only variable is set to False and a valid static_files_dir is provided.

The static_files_dir is expected to point to a directory containing the static files necessary for your frontend application. If the directory is not found or does not contain the necessary files, you might encounter a RuntimeError or see a blank page when you try to access the application in your browser.

Here are a few things you can check:

1. Verify the Structure of the Frontend Directory: The frontend directory should contain the necessary files and directories for your frontend application. This includes package.json, package-lock.json, tsconfig.json, vite.config.ts, index.html, tailwind.config.js, postcss.config.js, prettier.config.js, and a src/ directory containing the source code of your frontend application. You can refer to the Dockerfile in the frontend directory for more details.

2. Check the Docker Ignore File: If you're using Docker, make sure that the .dockerignore file is not instructing Docker to ignore the build directory. The build directory typically contains the compiled, static files necessary for your frontend application to run. If these files are not being included in your Docker image, your application might not have the necessary resources to display the page, resulting in a blank page. You can refer to the .dockerignore file in the frontend directory for more details.

3. Check the Path to the Static Files Directory: Make sure that the static_files_dir is pointing to the correct directory containing the static files for your frontend application. The path should be a PosixPath object pointing to a directory within your project structure.

If you've checked all of these things and are still encountering the issue, it would be helpful if you could provide more information about the exact error message you're seeing and the steps you're taking to run the application. This will help me better understand the issue and provide more targeted assistance. Dosu

Sources

• src/frontend/.dockerignore
• src/backend/langflow/main.py
• src/frontend/Dockerfile

About Dosu

This response is meant to be useful and save you time. It is not meant to be a precise solution, but rather a starting point for your own research.

Help me be more useful! Please leave a 👍 if this is helpful and 👎 if it is irrelevant.

If you want to continue the conversation, start your reply with @dosu-bot.

[ogabrielluiz]

Hi @mirzasreza
How are you?

It seems you are running langflow run from the repo. This shouldn't work because the backend requires a built version of the frontend to work.

One way you could do that is just running make backend in a terminal and make frontend in another.

Another way would be to run make build_frontend and then langflow run --path src/backend/langflow/frontend

Another would be to just run make build_and_run or make build_and_install which would work like as if you ran pip install langflow but using the local code.