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"""A passive environment checker wrapper for an environment's observation and action space along with the reset, step and render functions."""
import gym
from gym.core import ActType
from gym.utils.passive_env_checker import (
check_action_space,
check_observation_space,
env_render_passive_checker,
env_reset_passive_checker,
env_step_passive_checker,
)
class PassiveEnvChecker(gym.Wrapper):
"""A passive environment checker wrapper that surrounds the step, reset and render functions to check they follow the gym API."""
def __init__(self, env):
"""Initialises the wrapper with the environments, run the observation and action space tests."""
super().__init__(env)
assert hasattr(
env, "action_space"
), "The environment must specify an action space. https://www.gymlibrary.dev/content/environment_creation/"
check_action_space(env.action_space)
assert hasattr(
env, "observation_space"
), "The environment must specify an observation space. https://www.gymlibrary.dev/content/environment_creation/"
check_observation_space(env.observation_space)
self.checked_reset = False
self.checked_step = False
self.checked_render = False
def step(self, action: ActType):
"""Steps through the environment that on the first call will run the `passive_env_step_check`."""
if self.checked_step is False:
self.checked_step = True
return env_step_passive_checker(self.env, action)
else:
return self.env.step(action)
def reset(self, **kwargs):
"""Resets the environment that on the first call will run the `passive_env_reset_check`."""
if self.checked_reset is False:
self.checked_reset = True
return env_reset_passive_checker(self.env, **kwargs)
else:
return self.env.reset(**kwargs)
def render(self, *args, **kwargs):
"""Renders the environment that on the first call will run the `passive_env_render_check`."""
if self.checked_render is False:
self.checked_render = True
return env_render_passive_checker(self.env, *args, **kwargs)
else:
return self.env.render(*args, **kwargs)
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