Langcorn

LangCorn is an API server that enables you to serve LangChain models and pipelines with ease, leveraging the power of FastAPI for a robust and efficient experience.

Features

• Easy deployment of LangChain models and pipelines
• Ready to use auth functionality
• High-performance FastAPI framework for serving requests
• Scalable and robust solution for language processing applications
• Supports custom pipelines and processing
• Well-documented RESTful API endpoints
• Asynchronous processing for faster response times

📦 Installation

To get started with LangCorn, simply install the package using pip:

pip install langcorn

⛓️ Quick Start

Example LLM chain ex1.py

import os

from langchain import LLMMathChain, OpenAI

os.environ["OPENAI_API_KEY"] = os.environ.get("OPENAI_API_KEY", "sk-********")

llm = OpenAI(temperature=0)
chain = LLMMathChain(llm=llm, verbose=True)

Run your LangCorn FastAPI server:

langcorn server examples.ex1:chain


[INFO] 2023-04-18 14:34:56.32 | api:create_service:75 | Creating service
[INFO] 2023-04-18 14:34:57.51 | api:create_service:85 | lang_app='examples.ex1:chain':LLMChain(['product'])
[INFO] 2023-04-18 14:34:57.51 | api:create_service:104 | Serving
[INFO] 2023-04-18 14:34:57.51 | api:create_service:106 | Endpoint: /docs
[INFO] 2023-04-18 14:34:57.51 | api:create_service:106 | Endpoint: /examples.ex1/run
INFO:     Started server process [27843]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
INFO:     Uvicorn running on http://127.0.0.1:8718 (Press CTRL+C to quit)

or as an alternative

python -m langcorn server examples.ex1:chain

Run multiple chains

python -m langcorn server examples.ex1:chain examples.ex2:chain


[INFO] 2023-04-18 14:35:21.11 | api:create_service:75 | Creating service
[INFO] 2023-04-18 14:35:21.82 | api:create_service:85 | lang_app='examples.ex1:chain':LLMChain(['product'])
[INFO] 2023-04-18 14:35:21.82 | api:create_service:85 | lang_app='examples.ex2:chain':SimpleSequentialChain(['input'])
[INFO] 2023-04-18 14:35:21.82 | api:create_service:104 | Serving
[INFO] 2023-04-18 14:35:21.82 | api:create_service:106 | Endpoint: /docs
[INFO] 2023-04-18 14:35:21.82 | api:create_service:106 | Endpoint: /examples.ex1/run
[INFO] 2023-04-18 14:35:21.82 | api:create_service:106 | Endpoint: /examples.ex2/run
INFO:     Started server process [27863]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
INFO:     Uvicorn running on http://127.0.0.1:8718 (Press CTRL+C to quit)

Import the necessary packages and create your FastAPI app:

from fastapi import FastAPI
from langcorn import create_service

app:FastAPI = create_service("examples.ex1:chain")

Multiple chains

from fastapi import FastAPI
from langcorn import create_service

app:FastAPI = create_service("examples.ex2:chain", "examples.ex1:chain")

or

from fastapi import FastAPI
from langcorn import create_service

app: FastAPI = create_service(
    "examples.ex1:chain",
    "examples.ex2:chain",
    "examples.ex3:chain",
    "examples.ex4:sequential_chain",
    "examples.ex5:conversation",
    "examples.ex6:conversation_with_summary",
    "examples.ex7_agent:agent",
)

Run your LangCorn FastAPI server:

uvicorn