deepseek-recipe/server-py

server-py

A FastAPI example with Python mock inference. The server combines the Rust components exposed by deepseek_recipe for request conversion, prompt rendering, image resolution, and response processing. Request preparation and HTTP transport are implemented in main.py.

Usage

Use Python 3.10+ in a virtual environment and install the Rust and OpenCV prerequisites. From the repository root:

python3 -m venv .venv
. .venv/bin/activate
python3 -m pip install ./deepseek-recipe-python -r server-py/requirements.txt
python3 -m uvicorn main:app --app-dir server-py --host 127.0.0.1 --port 7777

Use --host and --port to change the listening address. On Windows PowerShell, activate with .venv\Scripts\Activate.ps1 instead.

API

• POST /v1/chat/completions
• POST /v1/responses
• POST /v1/messages

All three protocols support JSON for stream=false and SSE for stream=true.

For example, in a second terminal:

curl http://127.0.0.1:7777/v1/chat/completions \
  -H 'Content-Type: application/json' \
  -d '{"model":"deepseek-flash","messages":[{"role":"user","content":"Hello"}],"stream":false}'

The response contains the mock answer Hello world!. Set "stream":true and add -N to curl to inspect SSE output. No API key or model weights are required.

Custom inference

Use create_app(infer=...) in main.py to supply a backend. The callback receives the server's PreparedRequest, including the prompt, inference options, and processed images, and produces an asynchronous iterator of InferenceChunk values.

Use create_app(options=...) to change the Rust conversion defaults. The default ConversionOptions() ignores Responses web_search declarations and rejects Messages web_search declarations; switching to the other value reverses that behavior (Reject for Responses and Ignore for Messages).

Deployment scope

This example has no authentication and uses an image fetcher that does not filter private network addresses. Keep it on loopback for local use; see the deployment considerations before exposing it to other users. The Rust example uses the same default port.