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20bb95e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | # 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.
"""
Snake Environment HTTP Client.
This module provides the client for connecting to a Snake Environment server
over HTTP.
"""
from typing import Any, Dict
# Support both in-repo and standalone imports
try:
# In-repo imports (when running from OpenEnv repository)
from core.client_types import StepResult
from core.env_server.types import State
from core.http_env_client import HTTPEnvClient
from .models import SnakeAction, SnakeObservation
except ImportError:
from models import SnakeAction, SnakeObservation
# Standalone imports (when environment is standalone with openenv-core from pip)
from openenv_core.client_types import StepResult
from openenv_core.env_server.types import State
from openenv_core.http_env_client import HTTPEnvClient
class SnakeEnv(HTTPEnvClient[SnakeAction, SnakeObservation]):
"""
HTTP client for the Snake Environment.
This client connects to a SnakeEnvironment HTTP server and provides
methods to interact with it: reset(), step(), and state access.
Example:
>>> # Connect to a running server
>>> client = SnakeEnv(base_url="http://localhost:8000")
>>> result = client.reset()
>>> print(result.observation.alive) # True
>>>
>>> # Take an action (turn left)
>>> result = client.step(SnakeAction(action=1))
>>> print(result.observation.episode_score)
>>> print(result.reward)
Example with Docker:
>>> # Automatically start container and connect
>>> client = SnakeEnv.from_docker_image("snake-env:latest")
>>> result = client.reset()
>>> result = client.step(SnakeAction(action=0)) # noop
"""
def _step_payload(self, action: SnakeAction) -> Dict:
"""
Convert SnakeAction to JSON payload for step request.
Args:
action: SnakeAction instance
Returns:
Dictionary representation suitable for JSON encoding
"""
return {
"action": action.action,
}
def _parse_result(self, payload: Dict) -> StepResult[SnakeObservation]:
"""
Parse server response into StepResult[SnakeObservation].
Args:
payload: JSON response from server
Returns:
StepResult with SnakeObservation
"""
obs_data = payload.get("observation", {})
observation = SnakeObservation(
grid=obs_data.get("grid", []),
observation=obs_data.get("observation", []),
episode_score=obs_data.get("episode_score", 0.0),
episode_steps=obs_data.get("episode_steps", 0),
episode_fruits=obs_data.get("episode_fruits", 0),
episode_kills=obs_data.get("episode_kills", 0),
alive=obs_data.get("alive", True),
done=payload.get("done", False),
reward=payload.get("reward"),
metadata=obs_data.get("metadata", {}),
)
return StepResult(
observation=observation,
reward=payload.get("reward"),
done=payload.get("done", False),
)
def _parse_state(self, payload: Dict) -> State:
"""
Parse server response into State object.
Args:
payload: JSON response from /state endpoint
Returns:
State object with episode_id and step_count
"""
return State(
episode_id=payload.get("episode_id"),
step_count=payload.get("step_count", 0),
)
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