server/app.py

# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.

"""
FastAPI application for the OpenSpiel Environment.

This module creates an HTTP server that exposes OpenSpiel games
over HTTP endpoints, making them compatible with HTTPEnvClient.

Usage:
    # Development (with auto-reload):
    uvicorn server.app:app --reload --host 0.0.0.0 --port 8000

    # Production:
    uvicorn server.app:app --host 0.0.0.0 --port 8000 --workers 4

    # Or run directly:
    python -m server.app

Environment variables:
    OPENSPIEL_GAME: Game name to serve (default: "catch")
    OPENSPIEL_AGENT_PLAYER: Agent player ID (default: 0)
    OPENSPIEL_OPPONENT_POLICY: Opponent policy (default: "random")
"""

import os

try:
    from openenv_core.env_server.http_server import create_app
except Exception as e:  # pragma: no cover
    raise ImportError("openenv_core is required for the web interface. Install dependencies with '\n    uv sync\n'") from e

from .openspiel_environment import OpenSpielEnvironment
from models import OpenSpielAction, OpenSpielObservation

# Get game configuration from environment variables
game_name = os.getenv("OPENSPIEL_GAME", "catch")
agent_player = int(os.getenv("OPENSPIEL_AGENT_PLAYER", "0"))
opponent_policy = os.getenv("OPENSPIEL_OPPONENT_POLICY", "random")

# Create the environment instance
env = OpenSpielEnvironment(
    game_name=game_name,
    agent_player=agent_player,
    opponent_policy=opponent_policy,
)

# Create the FastAPI app with web interface and README integration
app = create_app(env, OpenSpielAction, OpenSpielObservation, env_name="openspiel")

def main(host: str = "0.0.0.0", port: int = 8000):
    """
    Entry point for direct execution via uv run or python -m.

    This function enables running the server without Docker:
        uv run --project . server
        uv run --project . server --port 8001
        python -m .server.app

    Args:
        host: Host address to bind to (default: "0.0.0.0")
        port: Port number to listen on (default: 8000)

    For production deployments, consider using uvicorn directly with
    multiple workers:
        uvicorn openspiel.server.app:app --workers 4
    """
    import uvicorn

    uvicorn.run(app, host=host, port=port)

if __name__ == "__main__":
    import argparse

    parser = argparse.ArgumentParser()
    parser.add_argument("--port", type=int, default=8000)
    args = parser.parse_args()
    main(port=args.port)