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 Stabilizer Forge Environment.

This module creates an HTTP server that exposes the StabilizerForgeEnvironment
over HTTP and WebSocket endpoints, compatible with EnvClient.

Endpoints:
    - POST /reset: Reset the environment
    - POST /step: Execute an action
    - GET /state: Get current environment state
    - GET /schema: Get action/observation schemas
    - WS /ws: WebSocket endpoint for persistent sessions

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
"""

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

try:
    from ..models import StabilizerAction, StabilizerObservation
    from .stabilizer_forge_environment import StabilizerForgeEnvironment
except ImportError:
    from models import StabilizerAction, StabilizerObservation
    from server.stabilizer_forge_environment import StabilizerForgeEnvironment


# Create the app. max_concurrent_envs=64 is the TRL-OpenEnv-RFC gotcha:
# the default of 1 silently kills GRPO parallelism (see RFC 004).
app = create_app(
    StabilizerForgeEnvironment,
    StabilizerAction,
    StabilizerObservation,
    env_name="stabilizer_forge",
    max_concurrent_envs=64,
)


def main():
    """Entry point for direct execution via `uv run server` or `python -m stabilizer_forge.server.app`."""
    import argparse
    import uvicorn

    parser = argparse.ArgumentParser()
    parser.add_argument("--host", default="0.0.0.0")
    parser.add_argument("--port", type=int, default=8000)
    args = parser.parse_args()
    uvicorn.run(app, host=args.host, port=args.port)


if __name__ == "__main__":
    main()