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https://github.com/OpenHands/OpenHands.git
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41cee4b68d
Co-authored-by: openhands <openhands@all-hands.dev> Co-authored-by: Calvin Smith <calvin@all-hands.dev>
78 lines
2.8 KiB
Python
78 lines
2.8 KiB
Python
from __future__ import annotations
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from typing import overload
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from pydantic import BaseModel
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from openhands.core.logger import openhands_logger as logger
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from openhands.events.action.agent import CondensationAction
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from openhands.events.event import Event
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from openhands.events.observation.agent import AgentCondensationObservation
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class View(BaseModel):
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"""Linearly ordered view of events.
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Produced by a condenser to indicate the included events are ready to process as LLM input.
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"""
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events: list[Event]
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def __len__(self) -> int:
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return len(self.events)
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def __iter__(self):
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return iter(self.events)
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# To preserve list-like indexing, we ideally support slicing and position-based indexing.
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# The only challenge with that is switching the return type based on the input type -- we
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# can mark the different signatures for MyPy with `@overload` decorators.
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@overload
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def __getitem__(self, key: slice) -> list[Event]: ...
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@overload
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def __getitem__(self, key: int) -> Event: ...
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def __getitem__(self, key: int | slice) -> Event | list[Event]:
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if isinstance(key, slice):
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start, stop, step = key.indices(len(self))
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return [self[i] for i in range(start, stop, step)]
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elif isinstance(key, int):
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return self.events[key]
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else:
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raise ValueError(f'Invalid key type: {type(key)}')
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@staticmethod
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def from_events(events: list[Event]) -> View:
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"""Create a view from a list of events, respecting the semantics of any condensation events."""
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forgotten_event_ids: set[int] = set()
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for event in events:
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if isinstance(event, CondensationAction):
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forgotten_event_ids.update(event.forgotten)
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# Make sure we also forget the condensation action itself
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forgotten_event_ids.add(event.id)
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kept_events = [event for event in events if event.id not in forgotten_event_ids]
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# If we have a summary, insert it at the specified offset.
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summary: str | None = None
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summary_offset: int | None = None
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# The relevant summary is always in the last condensation event (i.e., the most recent one).
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for event in reversed(events):
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if isinstance(event, CondensationAction):
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if event.summary is not None and event.summary_offset is not None:
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summary = event.summary
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summary_offset = event.summary_offset
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break
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if summary is not None and summary_offset is not None:
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logger.info(f'Inserting summary at offset {summary_offset}')
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kept_events.insert(
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summary_offset, AgentCondensationObservation(content=summary)
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)
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return View(events=kept_events)
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