Add prompt template from langfuse

[cruz-lucas]

I added a prompt component that fetches a prompt from LangFuse's repository.

The credentials come from the environment variables, that is, the variables LANGFUSE_SECRET_KEY, LANGFUSE_PUBLIC_KEY, LANGFUSE_HOST must be defined in the .env file in the packages/server/ directory.

The name of the prompt must be the exact name saved in the repository. The version of the prompt will be added in the future.

You can override the name of the template and variables like this:

import requests

API_URL = "api_url"


def query(payload):
    response = requests.post(API_URL, json=payload)
    return response.json()


output = query(
    {
        "question": "Hi, how are you?",
        "overrideConfig": {
            "template": "name_of_prompt",
            "promptValues": {
                "var1": "value1",
                "..."
            },
        },
    }
)

[HenryHengZJ]

thanks @cruz-lucas !