fix(attachments): sync thread state on upload/delete

src/services/conversation_service.py

@@ -1,8 +1,10 @@
 import uuid
+from datetime import UTC, datetime
 
 from fastapi import HTTPException, UploadFile
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from src.agents import agent_manager
 from src.repositories.conversation_repository import ConversationRepository
 from src.services.doc_converter import (
     ATTACHMENT_ALLOWED_EXTENSIONS,
@@ -41,6 +43,51 @@ def _make_attachment_path(file_name: str) -> str:
     return f"/attachments/{safe_name}.md"
 
 
+def _build_state_files(attachments: list[dict]) -> dict:
+    files = {}
+    for attachment in attachments:
+        if attachment.get("status") != "parsed":
+            continue
+
+        file_path = attachment.get("file_path")
+        markdown = attachment.get("markdown")
+        if not file_path or not markdown:
+            continue
+
+        now = datetime.now(UTC).isoformat()
+        files[file_path] = {
+            "content": markdown.split("\n"),
+            "created_at": attachment.get("uploaded_at", now),
+            "modified_at": attachment.get("uploaded_at", now),
+        }
+    return files
+
+
+async def _sync_thread_attachment_state(
+    *,
+    thread_id: str,
+    user_id: str,
+    agent_id: str,
+    attachments: list[dict],
+) -> None:
+    try:
+        agent = agent_manager.get_agent(agent_id)
+        if not agent:
+            logger.warning(f"Skip attachment state sync: agent not found ({agent_id})")
+            return
+
+        graph = await agent.get_graph()
+        await graph.aupdate_state(
+            config={"configurable": {"thread_id": thread_id, "user_id": str(user_id)}},
+            values={
+                "attachments": attachments,
+                "files": _build_state_files(attachments),
+            },
+        )
+    except Exception as e:
+        logger.warning(f"Failed to sync attachment state for thread {thread_id}: {e}")
+
+
 def serialize_attachment(record: dict) -> dict:
     """序列化附件记录，返回给前端"""
     return {
@@ -201,6 +248,13 @@ async def upload_thread_attachment_view(
         "minio_url": minio_url,
     }
     await conv_repo.add_attachment(conversation.id, attachment_record)
+    all_attachments = await conv_repo.get_attachments(conversation.id)
+    await _sync_thread_attachment_state(
+        thread_id=thread_id,
+        user_id=str(current_user_id),
+        agent_id=conversation.agent_id,
+        attachments=all_attachments,
+    )
 
     return serialize_attachment(attachment_record)
 
@@ -235,4 +289,11 @@ async def delete_thread_attachment_view(
     removed = await conv_repo.remove_attachment(conversation.id, file_id)
     if not removed:
         raise HTTPException(status_code=404, detail="附件不存在或已被删除")
+    all_attachments = await conv_repo.get_attachments(conversation.id)
+    await _sync_thread_attachment_state(
+        thread_id=thread_id,
+        user_id=str(current_user_id),
+        agent_id=conversation.agent_id,
+        attachments=all_attachments,
+    )
     return {"message": "附件已删除"}

test/test_conversation_service_attachment_state.py

@@ -0,0 +1,89 @@
+from __future__ import annotations
+
+from types import SimpleNamespace
+
+import pytest
+
+from src.services import conversation_service as svc
+
+
+def test_build_state_files_only_parsed_and_with_content():
+    attachments = [
+        {
+            "status": "parsed",
+            "file_path": "/attachments/a.md",
+            "markdown": "line1\nline2",
+            "uploaded_at": "2026-02-20T00:00:00+00:00",
+        },
+        {
+            "status": "pending",
+            "file_path": "/attachments/b.md",
+            "markdown": "ignored",
+        },
+        {
+            "status": "parsed",
+            "file_path": "/attachments/c.md",
+            "markdown": "",
+        },
+    ]
+
+    files = svc._build_state_files(attachments)
+
+    assert list(files.keys()) == ["/attachments/a.md"]
+    assert files["/attachments/a.md"]["content"] == ["line1", "line2"]
+    assert files["/attachments/a.md"]["created_at"] == "2026-02-20T00:00:00+00:00"
+
+
+@pytest.mark.asyncio
+async def test_sync_thread_attachment_state_updates_graph(monkeypatch: pytest.MonkeyPatch):
+    captured: dict = {}
+
+    class FakeGraph:
+        async def aupdate_state(self, *, config, values):
+            captured["config"] = config
+            captured["values"] = values
+
+    class FakeAgent:
+        async def get_graph(self):
+            return FakeGraph()
+
+    monkeypatch.setattr(svc.agent_manager, "get_agent", lambda _agent_id: FakeAgent())
+
+    attachments = [
+        {
+            "status": "parsed",
+            "file_path": "/attachments/resume.md",
+            "markdown": "hello\nworld",
+            "uploaded_at": "2026-02-20T00:00:00+00:00",
+        }
+    ]
+    await svc._sync_thread_attachment_state(
+        thread_id="thread-1",
+        user_id="u1",
+        agent_id="ChatbotAgent",
+        attachments=attachments,
+    )
+
+    assert captured["config"] == {"configurable": {"thread_id": "thread-1", "user_id": "u1"}}
+    assert captured["values"]["attachments"] == attachments
+    assert "/attachments/resume.md" in captured["values"]["files"]
+
+
+@pytest.mark.asyncio
+async def test_sync_thread_attachment_state_skips_when_agent_missing(monkeypatch: pytest.MonkeyPatch):
+    warnings: list[str] = []
+    fake_logger = SimpleNamespace(
+        warning=lambda message: warnings.append(message),
+    )
+
+    monkeypatch.setattr(svc, "logger", fake_logger)
+    monkeypatch.setattr(svc.agent_manager, "get_agent", lambda _agent_id: None)
+
+    await svc._sync_thread_attachment_state(
+        thread_id="thread-1",
+        user_id="u1",
+        agent_id="MissingAgent",
+        attachments=[],
+    )
+
+    assert any("agent not found" in msg for msg in warnings)