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6bf101c79b
Avoid AttributeError regressions when hooks define their own __init__ or when a CompositeHook wraps another composite. Made-with: Cursor
104 lines
3.5 KiB
Python
104 lines
3.5 KiB
Python
"""Shared lifecycle hook primitives for agent runs."""
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from __future__ import annotations
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from dataclasses import dataclass, field
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from typing import Any
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from loguru import logger
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from nanobot.providers.base import LLMResponse, ToolCallRequest
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@dataclass(slots=True)
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class AgentHookContext:
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"""Mutable per-iteration state exposed to runner hooks."""
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iteration: int
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messages: list[dict[str, Any]]
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response: LLMResponse | None = None
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usage: dict[str, int] = field(default_factory=dict)
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tool_calls: list[ToolCallRequest] = field(default_factory=list)
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tool_results: list[Any] = field(default_factory=list)
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tool_events: list[dict[str, str]] = field(default_factory=list)
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final_content: str | None = None
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stop_reason: str | None = None
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error: str | None = None
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class AgentHook:
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"""Minimal lifecycle surface for shared runner customization."""
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def __init__(self, reraise: bool = False) -> None:
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self._reraise = reraise
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def wants_streaming(self) -> bool:
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return False
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async def before_iteration(self, context: AgentHookContext) -> None:
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pass
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async def on_stream(self, context: AgentHookContext, delta: str) -> None:
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pass
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async def on_stream_end(self, context: AgentHookContext, *, resuming: bool) -> None:
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pass
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async def before_execute_tools(self, context: AgentHookContext) -> None:
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pass
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async def after_iteration(self, context: AgentHookContext) -> None:
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pass
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def finalize_content(self, context: AgentHookContext, content: str | None) -> str | None:
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return content
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class CompositeHook(AgentHook):
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"""Fan-out hook that delegates to an ordered list of hooks.
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Error isolation: async methods catch and log per-hook exceptions
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so a faulty custom hook cannot crash the agent loop.
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``finalize_content`` is a pipeline (no isolation — bugs should surface).
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"""
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__slots__ = ("_hooks",)
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def __init__(self, hooks: list[AgentHook]) -> None:
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super().__init__()
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self._hooks = list(hooks)
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def wants_streaming(self) -> bool:
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return any(h.wants_streaming() for h in self._hooks)
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async def _for_each_hook_safe(self, method_name: str, *args: Any, **kwargs: Any) -> None:
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for h in self._hooks:
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if getattr(h, "_reraise", False):
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await getattr(h, method_name)(*args, **kwargs)
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continue
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try:
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await getattr(h, method_name)(*args, **kwargs)
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except Exception:
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logger.exception("AgentHook.{} error in {}", method_name, type(h).__name__)
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async def before_iteration(self, context: AgentHookContext) -> None:
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await self._for_each_hook_safe("before_iteration", context)
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async def on_stream(self, context: AgentHookContext, delta: str) -> None:
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await self._for_each_hook_safe("on_stream", context, delta)
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async def on_stream_end(self, context: AgentHookContext, *, resuming: bool) -> None:
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await self._for_each_hook_safe("on_stream_end", context, resuming=resuming)
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async def before_execute_tools(self, context: AgentHookContext) -> None:
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await self._for_each_hook_safe("before_execute_tools", context)
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async def after_iteration(self, context: AgentHookContext) -> None:
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await self._for_each_hook_safe("after_iteration", context)
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def finalize_content(self, context: AgentHookContext, content: str | None) -> str | None:
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for h in self._hooks:
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content = h.finalize_content(context, content)
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return content
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