286 lines
11 KiB
Python
286 lines
11 KiB
Python
"""对话历史持久化。
|
||
|
||
只依赖管线已经发给客户端的最终文本事件，不侵入 Pipecat。媒体历史以后写入
|
||
conversation_artifacts，并把对象存储地址关联到会话或消息。
|
||
"""
|
||
|
||
import asyncio
|
||
from copy import deepcopy
|
||
from datetime import UTC, datetime
|
||
from uuid import uuid4
|
||
|
||
from db.models import ConversationArtifact, ConversationMessage, ConversationSession
|
||
from db.session import SessionLocal
|
||
from loguru import logger
|
||
from services.object_storage import delete_object, put_object, storage_uri
|
||
|
||
|
||
MAX_WORKFLOW_TRACE_EVENTS = 1000
|
||
|
||
|
||
def _parse_timestamp(value: object) -> datetime:
|
||
if not isinstance(value, str) or not value:
|
||
return datetime.now(UTC)
|
||
try:
|
||
parsed = datetime.fromisoformat(value.replace("Z", "+00:00"))
|
||
return parsed if parsed.tzinfo else parsed.replace(tzinfo=UTC)
|
||
except ValueError:
|
||
return datetime.now(UTC)
|
||
|
||
|
||
class ConversationRecorder:
|
||
"""按事件顺序写入一通会话；写库失败不应中断实时通话。"""
|
||
|
||
def __init__(self, session_id: str):
|
||
self.session_id = session_id
|
||
self._sequence = 0
|
||
self._trace_sequence = 0
|
||
self._lock = asyncio.Lock()
|
||
self._seen_events: set[str] = set()
|
||
self._pending_artifacts: set[asyncio.Task[None]] = set()
|
||
|
||
@classmethod
|
||
async def start(
|
||
cls,
|
||
*,
|
||
assistant_id: str | None,
|
||
assistant_name: str,
|
||
channel: str,
|
||
runtime_mode: str,
|
||
session_id: str | None = None,
|
||
extra: dict | None = None,
|
||
) -> "ConversationRecorder | None":
|
||
session_id = session_id or f"conv_{uuid4().hex[:20]}"
|
||
try:
|
||
async with SessionLocal() as db:
|
||
db.add(
|
||
ConversationSession(
|
||
id=session_id,
|
||
assistant_id=assistant_id,
|
||
assistant_name=assistant_name,
|
||
channel=channel,
|
||
runtime_mode=runtime_mode,
|
||
status="active",
|
||
message_count=0,
|
||
extra=deepcopy(extra or {}),
|
||
)
|
||
)
|
||
await db.commit()
|
||
return cls(session_id)
|
||
except Exception as exc:
|
||
logger.error(f"创建对话历史会话失败，不影响本次通话: {exc}")
|
||
return None
|
||
|
||
async def record_transport_message(self, message: object) -> None:
|
||
if not isinstance(message, dict):
|
||
return
|
||
event_type = message.get("type")
|
||
if event_type == "workflow-event":
|
||
await self._append_workflow_event(message)
|
||
return
|
||
role = ""
|
||
content = ""
|
||
extra: dict = {}
|
||
timestamp = message.get("timestamp")
|
||
event_key = ""
|
||
|
||
if event_type == "transcript":
|
||
role = str(message.get("role") or "")
|
||
content = str(message.get("content") or "").strip()
|
||
event_key = f"transcript:{role}:{timestamp}:{content}"
|
||
if message.get("source"):
|
||
extra["source"] = str(message["source"])
|
||
if message.get("nodeId"):
|
||
extra["node_id"] = str(message["nodeId"])
|
||
elif event_type == "assistant-text-end":
|
||
role = "assistant"
|
||
content = str(message.get("content") or "").strip()
|
||
turn_id = str(message.get("turn_id") or "")
|
||
event_key = f"assistant:{turn_id}"
|
||
extra = {
|
||
"turn_id": turn_id,
|
||
"interrupted": bool(message.get("interrupted", False)),
|
||
}
|
||
else:
|
||
return
|
||
|
||
if role not in {"user", "assistant"} or not content or event_key in self._seen_events:
|
||
return
|
||
self._seen_events.add(event_key)
|
||
await self._append(role, content, timestamp, extra)
|
||
|
||
async def _append_workflow_event(self, message: dict) -> None:
|
||
"""Persist bounded control-plane history without creating chat rows."""
|
||
|
||
event_id = str(message.get("eventId") or "")
|
||
event_name = str(message.get("event") or "")
|
||
event_key = f"workflow:{event_id}"
|
||
if not event_id or not event_name or event_key in self._seen_events:
|
||
return
|
||
self._seen_events.add(event_key)
|
||
|
||
async with self._lock:
|
||
next_sequence = self._trace_sequence + 1
|
||
payload = deepcopy(message)
|
||
payload["sessionId"] = self.session_id
|
||
payload["sequence"] = next_sequence
|
||
try:
|
||
async with SessionLocal() as db:
|
||
conversation = await db.get(ConversationSession, self.session_id)
|
||
if not conversation:
|
||
return
|
||
extra = dict(conversation.extra or {})
|
||
trace = list(extra.get("workflowTrace") or [])
|
||
trace.append(payload)
|
||
extra["workflowTrace"] = trace[-MAX_WORKFLOW_TRACE_EVENTS:]
|
||
conversation.extra = extra
|
||
await db.commit()
|
||
self._trace_sequence = next_sequence
|
||
except Exception as exc:
|
||
logger.error(f"保存 Workflow 轨迹失败，不影响本次通话: {exc}")
|
||
|
||
async def _append(
|
||
self,
|
||
role: str,
|
||
content: str,
|
||
timestamp: object,
|
||
extra: dict,
|
||
) -> None:
|
||
async with self._lock:
|
||
next_sequence = self._sequence + 1
|
||
try:
|
||
async with SessionLocal() as db:
|
||
db.add(
|
||
ConversationMessage(
|
||
id=f"msg_{uuid4().hex[:20]}",
|
||
session_id=self.session_id,
|
||
sequence=next_sequence,
|
||
role=role,
|
||
content_type="text",
|
||
content=content,
|
||
occurred_at=_parse_timestamp(timestamp),
|
||
extra=extra,
|
||
)
|
||
)
|
||
conversation = await db.get(ConversationSession, self.session_id)
|
||
if conversation:
|
||
conversation.message_count = next_sequence
|
||
await db.commit()
|
||
self._sequence = next_sequence
|
||
except Exception as exc:
|
||
logger.error(f"保存对话文本失败，不影响本次通话: {exc}")
|
||
|
||
def record_image_later(
|
||
self,
|
||
data: bytes,
|
||
*,
|
||
input_id: str,
|
||
timestamp: object,
|
||
mime_type: str = "image/jpeg",
|
||
) -> None:
|
||
"""Persist a captured frame without delaying the realtime model turn."""
|
||
|
||
task = asyncio.create_task(
|
||
self._record_image(
|
||
data,
|
||
input_id=input_id,
|
||
timestamp=timestamp,
|
||
mime_type=mime_type,
|
||
),
|
||
name=f"conversation-image:{self.session_id}:{input_id}",
|
||
)
|
||
self._pending_artifacts.add(task)
|
||
task.add_done_callback(self._pending_artifacts.discard)
|
||
|
||
async def _record_image(
|
||
self,
|
||
data: bytes,
|
||
*,
|
||
input_id: str,
|
||
timestamp: object,
|
||
mime_type: str,
|
||
) -> None:
|
||
message_id = f"msg_{uuid4().hex[:20]}"
|
||
artifact_id = f"artifact_{uuid4().hex[:20]}"
|
||
extension = ".jpg" if mime_type == "image/jpeg" else ".bin"
|
||
key = f"conversations/{self.session_id}/{artifact_id}{extension}"
|
||
try:
|
||
await asyncio.to_thread(put_object, key, data, mime_type)
|
||
except Exception as exc:
|
||
logger.error(f"保存会话图片到对象存储失败，不影响本次通话: {exc}")
|
||
return
|
||
|
||
async with self._lock:
|
||
next_sequence = self._sequence + 1
|
||
try:
|
||
async with SessionLocal() as db:
|
||
db.add(
|
||
ConversationMessage(
|
||
id=message_id,
|
||
session_id=self.session_id,
|
||
sequence=next_sequence,
|
||
role="user",
|
||
content_type="image",
|
||
content="",
|
||
occurred_at=_parse_timestamp(timestamp),
|
||
extra={
|
||
"input_id": input_id,
|
||
"source": "camera_capture",
|
||
},
|
||
)
|
||
)
|
||
db.add(
|
||
ConversationArtifact(
|
||
id=artifact_id,
|
||
session_id=self.session_id,
|
||
message_id=message_id,
|
||
kind="image",
|
||
storage_uri=storage_uri(key),
|
||
mime_type=mime_type,
|
||
size_bytes=len(data),
|
||
extra={"input_id": input_id},
|
||
)
|
||
)
|
||
conversation = await db.get(ConversationSession, self.session_id)
|
||
if conversation:
|
||
conversation.message_count = next_sequence
|
||
await db.commit()
|
||
self._sequence = next_sequence
|
||
except Exception as exc:
|
||
logger.error(f"保存会话图片索引失败，不影响本次通话: {exc}")
|
||
try:
|
||
await asyncio.to_thread(delete_object, key)
|
||
except Exception:
|
||
logger.warning(f"清理未关联的会话图片失败: {key}")
|
||
|
||
async def finish(self, *, status: str = "completed") -> None:
|
||
"""Finish the session even if the owning pipeline is being cancelled."""
|
||
finish_task = asyncio.create_task(
|
||
self._finish(status=status),
|
||
name=f"conversation-recorder-finish:{self.session_id}",
|
||
)
|
||
try:
|
||
await asyncio.shield(finish_task)
|
||
except asyncio.CancelledError:
|
||
# Shield prevents an interrupted pipeline cleanup from abandoning a
|
||
# checked-out asyncpg connection. Preserve cancellation only after
|
||
# the short database cleanup has returned the connection.
|
||
await asyncio.shield(finish_task)
|
||
raise
|
||
|
||
async def _finish(self, *, status: str) -> None:
|
||
pending_artifacts = list(self._pending_artifacts)
|
||
if pending_artifacts:
|
||
await asyncio.gather(*pending_artifacts, return_exceptions=True)
|
||
async with self._lock:
|
||
try:
|
||
async with SessionLocal() as db:
|
||
conversation = await db.get(ConversationSession, self.session_id)
|
||
if conversation:
|
||
conversation.status = status
|
||
conversation.ended_at = datetime.now(UTC)
|
||
conversation.message_count = self._sequence
|
||
await db.commit()
|
||
except Exception as exc:
|
||
logger.error(f"结束对话历史会话失败: {exc}")
|