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from openhands.core.exceptions import (
LLMMalformedActionError,
TaskInvalidStateError,
)
from openhands.core.logger import openhands_logger as logger
OPEN_STATE = 'open'
COMPLETED_STATE = 'completed'
ABANDONED_STATE = 'abandoned'
IN_PROGRESS_STATE = 'in_progress'
VERIFIED_STATE = 'verified'
STATES = [
OPEN_STATE,
COMPLETED_STATE,
ABANDONED_STATE,
IN_PROGRESS_STATE,
VERIFIED_STATE,
]
class Task:
id: str
goal: str
parent: 'Task | None'
subtasks: list['Task']
def __init__(
self,
parent: 'Task',
goal: str,
state: str = OPEN_STATE,
subtasks=None, # noqa: B006
):
"""Initializes a new instance of the Task class.
Args:
parent: The parent task, or None if it is the root task.
goal: The goal of the task.
state: The initial state of the task.
subtasks: A list of subtasks associated with this task.
"""
if subtasks is None:
subtasks = []
if parent.id:
self.id = parent.id + '.' + str(len(parent.subtasks))
else:
self.id = str(len(parent.subtasks))
self.parent = parent
self.goal = goal
logger.debug(f'Creating task {self.id} with parent={parent.id}, goal={goal}')
self.subtasks = []
for subtask in subtasks or []:
if isinstance(subtask, Task):
self.subtasks.append(subtask)
else:
goal = subtask.get('goal')
state = subtask.get('state')
subtasks = subtask.get('subtasks')
logger.debug(f'Reading: {goal}, {state}, {subtasks}')
self.subtasks.append(Task(self, goal, state, subtasks))
self.state = OPEN_STATE
def to_string(self, indent=''):
"""Returns a string representation of the task and its subtasks.
Args:
indent: The indentation string for formatting the output.
Returns:
A string representation of the task and its subtasks.
"""
emoji = ''
if self.state == VERIFIED_STATE:
emoji = '✅'
elif self.state == COMPLETED_STATE:
emoji = '🟢'
elif self.state == ABANDONED_STATE:
emoji = '❌'
elif self.state == IN_PROGRESS_STATE:
emoji = '💪'
elif self.state == OPEN_STATE:
emoji = '🔵'
result = indent + emoji + ' ' + self.id + ' ' + self.goal + '\n'
for subtask in self.subtasks:
result += subtask.to_string(indent + ' ')
return result
def to_dict(self):
"""Returns a dictionary representation of the task.
Returns:
A dictionary containing the task's attributes.
"""
return {
'id': self.id,
'goal': self.goal,
'state': self.state,
'subtasks': [t.to_dict() for t in self.subtasks],
}
def set_state(self, state):
"""Sets the state of the task and its subtasks.
Args: state: The new state of the task.
Raises:
TaskInvalidStateError: If the provided state is invalid.
"""
if state not in STATES:
logger.error('Invalid state: %s', state)
raise TaskInvalidStateError(state)
self.state = state
if (
state == COMPLETED_STATE
or state == ABANDONED_STATE
or state == VERIFIED_STATE
):
for subtask in self.subtasks:
if subtask.state != ABANDONED_STATE:
subtask.set_state(state)
elif state == IN_PROGRESS_STATE:
if self.parent is not None:
self.parent.set_state(state)
def get_current_task(self) -> 'Task | None':
"""Retrieves the current task in progress.
Returns:
The current task in progress, or None if no task is in progress.
"""
for subtask in self.subtasks:
if subtask.state == IN_PROGRESS_STATE:
return subtask.get_current_task()
if self.state == IN_PROGRESS_STATE:
return self
return None
class RootTask(Task):
"""Serves as the root node in a tree of tasks.
Because we want the top-level of the root_task to be a list of tasks (1, 2, 3, etc.),
the "root node" of the data structure is kind of invisible--it just
holds references to the top-level tasks.
Attributes:
id: Kept blank for root_task
goal: Kept blank for root_task
parent: None for root_task
subtasks: The top-level list of tasks associated with the root_task.
state: The state of the root_task.
"""
id: str = ''
goal: str = ''
parent: None = None
def __init__(self):
self.subtasks = []
self.state = OPEN_STATE
def __str__(self):
"""Returns a string representation of the root_task.
Returns:
A string representation of the root_task.
"""
return self.to_string()
def get_task_by_id(self, id: str) -> Task:
"""Retrieves a task by its ID.
Args:
id: The ID of the task.
Returns:
The task with the specified ID.
Raises:
AgentMalformedActionError: If the provided task ID is invalid or does not exist.
"""
if id == '':
return self
if len(self.subtasks) == 0:
raise LLMMalformedActionError('Task does not exist:' + id)
try:
parts = [int(p) for p in id.split('.')]
except ValueError:
raise LLMMalformedActionError('Invalid task id:' + id)
task: Task = self
for part in parts:
if part >= len(task.subtasks):
raise LLMMalformedActionError('Task does not exist:' + id)
task = task.subtasks[part]
return task
def add_subtask(self, parent_id: str, goal: str, subtasks: list | None = None):
"""Adds a subtask to a parent task.
Args:
parent_id: The ID of the parent task.
goal: The goal of the subtask.
subtasks: A list of subtasks associated with the new subtask.
"""
subtasks = subtasks or []
parent = self.get_task_by_id(parent_id)
child = Task(parent=parent, goal=goal, subtasks=subtasks)
parent.subtasks.append(child)
def set_subtask_state(self, id: str, state: str):
"""Sets the state of a subtask.
Args:
id: The ID of the subtask.
state: The new state of the subtask.
"""
task = self.get_task_by_id(id)
logger.debug('Setting task {task.id} from state {task.state} to {state}')
task.set_state(state)
unfinished_tasks = [
t
for t in self.subtasks
if t.state not in [COMPLETED_STATE, VERIFIED_STATE, ABANDONED_STATE]
]
if len(unfinished_tasks) == 0:
self.set_state(COMPLETED_STATE)
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