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"""Persistent session storage for ollama-web."""
from __future__ import annotations
import json
import shutil
import uuid
from dataclasses import dataclass, field
from datetime import datetime, timezone
from pathlib import Path
from typing import Any
from .config import settings
def _now() -> str:
return datetime.now(timezone.utc).isoformat()
@dataclass
class ChatFile:
id: str
name: str
path: str
mime: str
size: int
text: str
source: str # "upload" | "fetch"
def to_dict(self) -> dict[str, Any]:
return {
"id": self.id,
"name": self.name,
"path": self.path,
"mime": self.mime,
"size": self.size,
"text": self.text,
"source": self.source,
}
@classmethod
def from_dict(cls, data: dict[str, Any]) -> "ChatFile":
return cls(
id=data["id"],
name=data["name"],
path=data["path"],
mime=data.get("mime", "application/octet-stream"),
size=data.get("size", 0),
text=data.get("text", ""),
source=data.get("source", "upload"),
)
@dataclass
class ChatMessage:
role: str
content: str
attachments: list[str] = field(default_factory=list)
def to_dict(self) -> dict[str, Any]:
return {
"role": self.role,
"content": self.content,
"attachments": list(self.attachments),
}
@classmethod
def from_dict(cls, data: dict[str, Any]) -> "ChatMessage":
return cls(
role=data.get("role", "user"),
content=data.get("content", ""),
attachments=list(data.get("attachments", [])),
)
class SessionStore:
"""Manage chat sessions as JSON files under the configured data directory."""
def __init__(self, data_dir: str | Path | None = None) -> None:
self.data_dir = Path(data_dir or settings.data_dir).resolve()
self.sessions_dir = self.data_dir / "sessions"
self.sessions_dir.mkdir(parents=True, exist_ok=True)
def _session_dir(self, session_id: str) -> Path:
return self.sessions_dir / session_id
def _session_file(self, session_id: str) -> Path:
return self._session_dir(session_id) / "session.json"
def _files_dir(self, session_id: str) -> Path:
files_dir = self._session_dir(session_id) / "files"
files_dir.mkdir(parents=True, exist_ok=True)
return files_dir
def list_sessions(self) -> list[dict[str, Any]]:
out: list[dict[str, Any]] = []
if not self.sessions_dir.exists():
return out
for entry in sorted(self.sessions_dir.iterdir(), key=lambda p: p.stat().st_mtime, reverse=True):
if not entry.is_dir():
continue
session_file = entry / "session.json"
if not session_file.exists():
continue
try:
data = json.loads(session_file.read_text(encoding="utf-8"))
out.append(
{
"id": data["id"],
"title": data.get("title", "Untitled"),
"updated_at": data.get("updated_at", data.get("created_at", "")),
}
)
except Exception: # noqa: BLE001
continue
return out
def create(self, title: str | None = None) -> dict[str, Any]:
session_id = uuid.uuid4().hex
now = _now()
session = {
"id": session_id,
"title": title or "新しいセッション",
"created_at": now,
"updated_at": now,
"messages": [],
"files": [],
}
self._session_dir(session_id).mkdir(parents=True, exist_ok=True)
self._save(session_id, session)
return session
def get(self, session_id: str) -> dict[str, Any] | None:
session_file = self._session_file(session_id)
if not session_file.exists():
return None
try:
return json.loads(session_file.read_text(encoding="utf-8"))
except Exception: # noqa: BLE001
return None
def save(self, session: dict[str, Any]) -> None:
session["updated_at"] = _now()
self._save(session["id"], session)
def _save(self, session_id: str, session: dict[str, Any]) -> None:
session_file = self._session_file(session_id)
session_file.parent.mkdir(parents=True, exist_ok=True)
session_file.write_text(json.dumps(session, ensure_ascii=False, indent=2), encoding="utf-8")
def delete(self, session_id: str) -> bool:
session_dir = self._session_dir(session_id)
if not session_dir.exists():
return False
try:
shutil.rmtree(session_dir)
return True
except Exception: # noqa: BLE001
return False
def add_message(
self,
session_id: str,
role: str,
content: str,
attachments: list[str] | None = None,
) -> dict[str, Any] | None:
session = self.get(session_id)
if session is None:
return None
session["messages"].append(
ChatMessage(
role=role,
content=content,
attachments=list(attachments or []),
).to_dict()
)
if role == "user" and len(session["messages"]) <= 2:
first_user = next(
(m for m in session["messages"] if m["role"] == "user"),
None,
)
if first_user:
title = first_user["content"].strip().replace("\n", " ")[:40]
session["title"] = title + ("…" if len(first_user["content"]) > 40 else "")
self.save(session)
return session
def add_file(
self,
session_id: str,
name: str,
data: bytes,
mime: str,
text: str,
source: str = "upload",
) -> ChatFile:
self._session_dir(session_id).mkdir(parents=True, exist_ok=True)
file_id = uuid.uuid4().hex
ext = Path(name).suffix
stored_name = f"{file_id}{ext}"
file_path = self._files_dir(session_id) / stored_name
file_path.write_bytes(data)
rel_path = str((self._session_dir(session_id) / "files" / stored_name).relative_to(self.data_dir))
chat_file = ChatFile(
id=file_id,
name=name,
path=rel_path,
mime=mime,
size=len(data),
text=text,
source=source,
)
session = self.get(session_id)
if session is None:
session = self.create()
session_id = session["id"]
session["files"].append(chat_file.to_dict())
self.save(session)
return chat_file
def remove_file(self, session_id: str, file_id: str) -> bool:
session = self.get(session_id)
if session is None:
return False
files = session.get("files", [])
target = next((f for f in files if f["id"] == file_id), None)
if target is None:
return False
files.remove(target)
session["files"] = files
try:
abs_path = self.data_dir / target["path"]
if abs_path.exists():
abs_path.unlink()
except Exception: # noqa: BLE001
pass
self.save(session)
return True
def get_file(self, session_id: str, file_id: str) -> ChatFile | None:
session = self.get(session_id)
if session is None:
return None
for f in session.get("files", []):
if f["id"] == file_id:
return ChatFile.from_dict(f)
return None
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