client.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.

"""SQL Query Optimizer Client."""

from typing import Dict

from openenv.core import EnvClient
from openenv.core.client_types import StepResult
from openenv.core.env_server.types import State

from models import Action, Observation


class SQLEnvClient(
    EnvClient[Action, Observation, State]
):
    """
    Client for the SQL Query Optimizer Environment.

    This client maintains a persistent WebSocket connection to the environment server.
    """

    def _step_payload(self, action: Action) -> Dict:
        """
        Convert Action to JSON payload for step message.
        """
        return action.model_dump()

    def _parse_result(self, payload: Dict) -> StepResult[Observation]:
        """
        Parse server response into StepResult[Observation].
        """
        obs_data = payload.get("observation", {})
        observation = Observation(**obs_data)

        # Get reward payload properly (whether it's a dict or primitive)
        reward_data = payload.get("reward")

        return StepResult(
            observation=observation,
            reward=reward_data,
            done=payload.get("done", False),
        )

    def _parse_state(self, payload: Dict) -> State:
        """
        Parse server response into State object.
        """
        return State(
            episode_id=payload.get("episode_id"),
            step_count=payload.get("step_count", 0),
        )