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171 | class HVEventToACP:
"""Translates internal HV events into ACP session-update calls.
Mirrors :class:`ant_ai.a2a.translator.HVEventToA2A` but targets the ACP
protocol, using semantic ACP types (AgentMessageChunk, AgentThoughtChunk,
ToolCallStart, ToolCallProgress) instead of a flat text stream.
"""
def __init__(self) -> None:
self._handlers: dict[type[Event], Handler] = {}
self._register_handlers()
def _register_handlers(self) -> None:
for attr_name in dir(self):
method = getattr(self, attr_name)
types = getattr(method, "_event_types", None)
if types:
for t in types:
self._handlers[t] = method
async def apply(self, event: Event, client: Client, session_id: str) -> None:
"""Dispatch *event* to its registered handler.
Raises:
ValueError: If no handler is registered for the event type.
"""
event_handler = self._handlers.get(type(event))
if event_handler is None:
raise ValueError(
f"No handler registered for event type: {type(event).__name__}"
)
await event_handler(event, client, session_id)
@handler(StartEvent, UpdateEvent, MaxStepsReachedEvent, CompletedEvent)
async def _noop(self, event: Event, client: Client, session_id: str) -> None:
pass
@handler(FinalAnswerEvent, ClarificationNeededEvent)
async def _agent_message(
self, event: Event, client: Client, session_id: str
) -> None:
# If the text was already streamed token-by-token as ContentDeltaEvents (stream_id set on the terminal event), re-sending the whole thing would uplicate it in the client; the deltas already delivered the message.
if getattr(event, "stream_id", None):
return
await client.session_update(
session_id=session_id,
update=AgentMessageChunk(
session_update="agent_message_chunk",
content=_text_block(event.content),
),
)
@handler(ReasoningEvent)
async def _agent_thought(
self, event: Event, client: Client, session_id: str
) -> None:
if getattr(event, "stream_id", None):
return
await client.session_update(
session_id=session_id,
update=AgentThoughtChunk(
session_update="agent_thought_chunk",
content=_text_block(event.content),
),
)
@handler(ContentDeltaEvent)
async def _content_delta(
self, event: Event, client: Client, session_id: str
) -> None:
assert isinstance(event, ContentDeltaEvent)
if not event.delta:
return
if event.target_kind == "reasoning":
update = AgentThoughtChunk(
session_update="agent_thought_chunk",
content=_text_block(event.delta),
)
elif event.target_kind == "content":
update = AgentMessageChunk(
session_update="agent_message_chunk",
content=_text_block(event.delta),
)
else:
# tool-calling fragments are surfaced via ToolCallingEvent instead
return
await client.session_update(session_id=session_id, update=update)
@handler(ToolCallingEvent)
async def _tool_call_start(
self, event: Event, client: Client, session_id: str
) -> None:
assert isinstance(event, ToolCallingEvent)
# acp-ui only attaches tool_call updates to an existing assistant message; if none exists yet the update is silently dropped. Send an empty chunk to create the message container before sending ToolCallStart events.
await client.session_update(
session_id=session_id,
update=AgentMessageChunk(
session_update="agent_message_chunk",
content=_text_block(""),
),
)
for tool_call in event.tool_calls:
await client.session_update(
session_id=session_id,
update=ToolCallStart(
session_update="tool_call",
tool_call_id=tool_call.id,
title=tool_call.function.name,
status="in_progress",
),
)
@handler(ToolResultEvent)
async def _tool_call_done(
self, event: Event, client: Client, session_id: str
) -> None:
assert isinstance(event, ToolResultEvent)
await client.session_update(
session_id=session_id,
update=ToolCallProgress(
session_update="tool_call_update",
tool_call_id=event.tool_call_id,
status="completed",
raw_output=event.content or None,
),
)
|