Files
hermes-agent/gateway/stream_dispatch.py
T

85 lines
3.4 KiB
Python

"""Adapter-driven dispatch of structured stream events (gateway/stream_events.py).
Message events flow into the consumer; tool events are formatted by the adapter (None
= eat it on platforms without tool chrome) and enqueued onto the same tool-progress
queue the gateway drains, so the two paths never race. Synchronous: callable from
the agent's worker thread.
"""
from __future__ import annotations
import logging
from typing import Any, Callable, Optional
from gateway.stream_events import (
Commentary, GatewayNotice, LongToolHint, MessageChunk, MessageStop, StreamEvent, ToolCallChunk,
)
logger = logging.getLogger("gateway.stream_events")
class GatewayEventDispatcher:
"""Route typed stream events through an adapter onto a delivery sink.
sink: the GatewayStreamConsumer, or None when streaming is disabled (message
events dropped; the final still goes out normally). enqueue_tool_line: None
when tool progress is disabled. tool_mode: "all"/"new"/"verbose"/"off";
preview_max_len: ``tool_preview_length`` (0 = no cap in verbose).
on_long_tool / on_notice: the gateway owns the "surface this here?" decision.
"""
def __init__(
self,
adapter: Any,
sink: Any = None,
*,
enqueue_tool_line: Optional[Callable[[Any], None]] = None,
tool_mode: str = "all",
preview_max_len: int = 40,
on_long_tool: Optional[Callable[[LongToolHint], None]] = None,
on_notice: Optional[Callable[[GatewayNotice], None]] = None,
) -> None:
self.adapter = adapter
self.sink = sink
self._enqueue_tool_line = enqueue_tool_line
self.tool_mode = tool_mode or "all"
self.preview_max_len = preview_max_len
self._on_long_tool = on_long_tool
self._on_notice = on_notice
self._last_tool: Optional[str] = None # "new"-mode dedup
def dispatch(self, event: StreamEvent) -> None:
"""Route a single event. Never raises into the agent's worker thread."""
try:
self._dispatch(event)
except Exception: # presentation must never break the agent loop
logger.debug("stream-event dispatch error", exc_info=True)
def _dispatch(self, event: StreamEvent) -> None:
# ToolCallFinished: no chrome on completion (only "started" is rendered);
# completion only drives onboarding hints (LongToolHint).
if isinstance(event, (MessageChunk, MessageStop, Commentary)):
if self.sink is not None:
self.adapter.render_message_event(event, self.sink)
elif isinstance(event, ToolCallChunk):
self._dispatch_tool_call(event)
elif isinstance(event, LongToolHint) and self._on_long_tool is not None:
self._on_long_tool(event)
elif isinstance(event, GatewayNotice) and self._on_notice is not None:
self._on_notice(event)
def _dispatch_tool_call(self, event: ToolCallChunk) -> None:
if self.tool_mode == "off" or self._enqueue_tool_line is None:
return
if self.tool_mode == "new" and event.tool_name == self._last_tool:
return
self._last_tool = event.tool_name
line = self.adapter.format_tool_event(
event, mode=self.tool_mode, preview_max_len=self.preview_max_len,
)
if line: # None/"" == adapter chose to eat this event
self._enqueue_tool_line(line)
__all__ = ["GatewayEventDispatcher"]