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"""SSE streaming chat endpoint."""
from __future__ import annotations
import functools
import inspect
import json
import logging
from collections.abc import AsyncIterator
from typing import Any
from ollama import Message
from starlette.requests import Request
from starlette.responses import StreamingResponse
from ..sessions import SessionStore
from ..tools.fetch import pop_fetched_files
from ..tools.registry import ToolRegistry, default_registry
logger = logging.getLogger("ollama_web.chat")
def _parse_messages(raw: list[dict[str, Any]]) -> list[Message]:
"""Convert raw JSON message dicts into ``ollama.Message`` objects."""
out: list[Message] = []
for m in raw:
role = m.get("role", "user")
content = m.get("content", "")
name = m.get("name")
images = m.get("images")
kwargs: dict[str, Any] = {"role": role, "content": content}
if name:
kwargs["name"] = name
if images:
kwargs["images"] = images
out.append(Message(**kwargs))
return out
def _session_aware_registry(session_id: str | None) -> ToolRegistry:
"""Return a registry whose search_and_fetch receives the session id."""
reg = default_registry()
original = reg.get("search_and_fetch")
if original is not None and session_id is not None:
@functools.wraps(original)
def wrapped(*args: Any, **kwargs: Any) -> Any:
sig = inspect.signature(original)
bound = sig.bind(*args, **kwargs)
bound.arguments["session_id"] = session_id
return original(*bound.args, **bound.kwargs)
reg._tools["search_and_fetch"] = wrapped # noqa: SLF001
return reg
def _attachment_context(store: SessionStore, session_id: str, file_ids: list[str]) -> str:
parts: list[str] = []
for file_id in file_ids:
chat_file = store.get_file(session_id, file_id)
if chat_file is None:
continue
text = chat_file.text or ""
parts.append(
f"<attached-file name=\"{chat_file.name}\" id=\"{chat_file.id}\" "
f"source=\"{chat_file.source}\">\n{text}\n</attached-file>"
)
if not parts:
return ""
return "\n\n".join(["以下はユーザーが添付したファイルの内容です：", *parts])
async def _event_stream(
request: Request,
payload: dict[str, Any],
session_id: str | None,
) -> AsyncIterator[bytes]:
"""Yield SSE events from the tool-augmented chat loop."""
model = payload.get("model") or request.app.state.settings.default_model
think = payload.get("think")
store: SessionStore = request.app.state.session_store
file_ids: list[str] = list(payload.get("file_ids", []))
session_messages: list[Message] = []
if session_id:
session = store.get(session_id)
if session is not None:
session_messages = _parse_messages(session.get("messages", []))
user_content = ""
raw_messages = payload.get("messages", [])
if raw_messages:
user_content = str(raw_messages[-1].get("content", "") or "")
attachment_ctx = ""
if session_id and file_ids:
attachment_ctx = _attachment_context(store, session_id, file_ids)
if attachment_ctx and user_content:
# Inject attachment context into the latest user message.
augmented = f"{user_content}\n\n{attachment_ctx}"
if raw_messages:
raw_messages[-1]["content"] = augmented
elif attachment_ctx:
raw_messages.append({"role": "user", "content": attachment_ctx})
messages = _parse_messages(raw_messages)
if session_messages:
messages = session_messages + messages
host = request.app.state.settings.ollama_host
from ollama_web import llm # local import to avoid circular at module load
registry = _session_aware_registry(session_id)
assistant_text = ""
finished = False
async for event in llm.astream_chat_with_tools(messages, model, think=think, host=host, registry=registry):
if event.get("type") == "delta":
assistant_text += event.get("content", "")
elif event.get("type") == "done":
finished = True
data = json.dumps(event, ensure_ascii=False)
yield f"data: {data}\n\n".encode()
# Persist user and assistant messages to the session.
if session_id and user_content:
store.add_message(
session_id=session_id,
role="user",
content=user_content,
attachments=file_ids,
)
if assistant_text:
store.add_message(
session_id=session_id,
role="assistant",
content=assistant_text,
)
# Persist fetched files from tools like search_and_fetch.
if session_id:
fetched = pop_fetched_files(session_id)
for f in fetched:
store.add_file(
session_id=session_id,
name=f["name"],
data=f["data"],
mime=f["mime"],
text=f["text"],
source="fetch",
)
async def chat(request: Request) -> StreamingResponse:
"""POST /api/chat: stream chat events as Server-Sent Events."""
try:
body = await request.body()
payload = json.loads(body.decode("utf-8"))
except Exception as exc:
logger.error("failed to parse request json: %s", exc)
data = json.dumps({"type": "error", "message": f"Invalid JSON: {exc}"}, ensure_ascii=False)
return StreamingResponse(
_single_event(data),
media_type="text/event-stream",
)
session_id = payload.get("session_id")
msg_count = len(payload.get("messages", []))
logger.info("chat request model=%s session=%s messages=%d", payload.get("model"), session_id, msg_count)
return StreamingResponse(
_event_stream(request, payload, session_id),
media_type="text/event-stream",
)
async def _single_event(data: str) -> AsyncIterator[bytes]:
"""Yield a single SSE event and finish."""
yield f"data: {data}\n\n".encode()
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