[Bug] send_message_to_user 莫名报 no such file，即使 file 存在且权限正确

[Neclyon]

Description

如题。
文件存在：

root@c07b606f5403:/AstrBot# ls -la /AstrBot/data/workspaces/_Peony_FriendMessage_3372728115/cash.py
-rwxrwxrwx 1 root root 1237 Aug 11 16:47 /AstrBot/data/workspaces/_Peony_FriendMessage_3372728115/cash.py

tool call 参数：

{"messages": [{"type": "file", "path": "/AstrBot/data/workspaces/_Peony_FriendMessage_3372728115/cash.py"}], "session": ""}

也没有错误。
但是工具调用返回：

ENOENT: no such file or directory

Reproduction Steps

在 aiocqhttp 平台部署 Docker 配置的 AstrBot V4.27.1 并在私聊中让其发送一个位于自己当前工作区的文件。

AstrBot Version

V4.27.1

Operating System

Linux

Deployment Method

Docker version 29.6.2, build dfc4efb1e2

Message Platform Adapter

Onebot (aiocqhttp) V11 with NapCat v4.18.9, QQ 3.2.28-48517.

Error Log

[2026-08-11 16:49:56.143] [Core]
[WARN]
[v4.27.1] [runners.tool_loop_agent_runner:1266]: Traceback (most recent call last):
  File "/AstrBot/astrbot/core/agent/runners/tool_loop_agent_runner.py", line 1148, in _handle_function_tools
    async for resp in self._iter_tool_executor_results(executor):  # type: ignore
  File "/AstrBot/astrbot/core/agent/runners/tool_loop_agent_runner.py", line 1502, in _iter_tool_executor_results
    yield next_result_task.result()
          ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/AstrBot/astrbot/core/agent/runners/tool_loop_agent_runner.py", line 1472, in _next_executor_result
    return await anext(executor)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/AstrBot/astrbot/core/astr_agent_tool_exec.py", line 185, in execute
    async for r in cls._execute_local(tool, run_context, **tool_args):
  File "/AstrBot/astrbot/core/astr_agent_tool_exec.py", line 666, in _execute_local
    resp = await asyncio.wait_for(
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/asyncio/tasks.py", line 520, in wait_for
    return await fut
           ^^^^^^^^^
  File "/AstrBot/astrbot/core/astr_agent_tool_exec.py", line 807, in call_local_llm_tool
    ret = await ready_to_call
          ^^^^^^^^^^^^^^^^^^^
  File "/AstrBot/astrbot/core/tools/message_tools.py", line 338, in call
    await context.context.context.send_message(target_session, message_chain)
  File "/AstrBot/astrbot/core/star/context.py", line 537, in send_message
    await platform.send_by_session(session, message_chain)
  File "/AstrBot/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_platform_adapter.py", line 119, in send_by_session
    await AiocqhttpMessageEvent.send_message(
  File "/AstrBot/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_message_event.py", line 175, in send_message
    await cls._dispatch_send(bot, event, is_group, session_id, [d])
  File "/AstrBot/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_message_event.py", line 113, in _dispatch_send
    await bot.send_private_msg(
  File "/usr/local/lib/python3.12/site-packages/aiocqhttp/__init__.py", line 236, in call_action
    return await self._api.call_action(action=action, **params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/aiocqhttp/api_impl.py", line 178, in call_action
    result = await self._wsr_api.call_action(action, **params)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/aiocqhttp/api_impl.py", line 153, in call_action
    return _handle_api_result(await
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/aiocqhttp/api_impl.py", line 38, in _handle_api_result
    raise ActionFailed(result=result)
aiocqhttp.exceptions.ActionFailed: <ActionFailed status='failed', retcode=1200, data=None, message="ENOENT: no such file or directory, open '/AstrBot/data/workspaces/_Peony_FriendMessage_3372728115/cash.py'", wording="ENOENT: no such file or directory, open '/AstrBot/data/workspaces/_Peony_FriendMessage_3372728115/cash.py'", echo={'seq': 40}, stream='normal-action'>

Supplementary Information

No response

Checklist

• I have searched the Issue list for related issues and could not resolve the problem, or this issue has never been reported before.
• I have tried disabling all plugins to rule out issues caused by plugins.
• The issue I am reporting is related to AstrBot itself, not to a specific plugin.
• I have read and agree to the project's Code of Conduct.
• (Optional) I am willing to submit a PR to help fix this issue.

[dosubot]

Hi @Neclyon! I'm Dosu and I'm helping the AstrBotTeam team.

这是一个 Docker 容器隔离导致的问题，与 #9158 的根因相同 [1]：

根因：Image/Record 类型在 _from_segment_to_dict() 中会先在 AstrBot 容器内读取文件并转为 base64:// 发送，NapCat 无需访问文件系统。但 File 类型走的是另一条路径——只将本地路径转成 file:// URI 后直接发给 NapCat [2]。NapCat 运行在宿主机或另一个容器中，根本访问不到 AstrBot 容器内的 /AstrBot/data/workspaces/...，所以报 ENOENT [3]。

临时绕过方案：在 Docker Compose 中将 AstrBot 的工作区目录挂载到 NapCat 容器的相同路径，使 NapCat 也能访问 /AstrBot/data/workspaces/。

根本修复：在 _from_segment_to_dict 的 isinstance(segment, File) 分支中，像 Image/Record 一样先在容器内读取文件并以 base64:// 格式发送，失败时再回退到 file:// URI。涉及文件：astrbot/core/platform/sources/aiocqhttp/aiocqhttp_message_event.py [1]。

To reply, just mention @dosu.

---

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[Neclyon]

@dosu 写一个插件修复该问题。

[dosubot]

@Neclyon 这个问题无法通过插件修复，因为问题出在 AstrBot 核心的消息序列化逻辑中（_from_segment_to_dict 方法），插件无法覆盖或 hook 这个静态方法 [1]。需要直接修改核心代码或提交 PR。

问题根因：Image/Record 在发送时通过 convert_to_base64() 将文件内容编码为 base64:// 发送 [2]，而 File 分支调用 segment.to_dict()，在没有配置 callback_api_base 时直接返回本地路径 [3]，NapCat/go-cqhttp 在容器外无法访问该路径，导致 ENOENT [4]。

修复方案：修改 astrbot/core/platform/sources/aiocqhttp/aiocqhttp_message_event.py 中 _from_segment_to_dict 的 File 分支，优先以 base64 方式发送：

if isinstance(segment, File):
    file_path = await segment.get_file()
    if file_path and os.path.isfile(file_path):
        import base64
        try:
            with open(file_path, "rb") as f:
                b64 = base64.b64encode(f.read()).decode()
            return {
                "type": "file",
                "data": {
                    "name": segment.name or os.path.basename(file_path),
                    "file": f"base64://{b64}",
                },
            }
        except Exception:
            pass
    # 回退：原有逻辑
    d = await segment.to_dict()
    file_val = d.get("data", {}).get("file", "")
    if file_val:
        import pathlib
        try:
            path_obj = pathlib.Path(file_val)
            if path_obj.is_absolute() and "://" not in file_val:
                d["data"]["file"] = path_obj.as_uri()
        except Exception:
            pass
    return d

建议以 PR 的形式直接提交到核心仓库。

To reply, just mention @dosu.

---

Docs are dead. Just use Dosu.