370 lines
13 KiB
Python
370 lines
13 KiB
Python
from fastapi import FastAPI, Depends, HTTPException
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.responses import StreamingResponse
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from sqlalchemy.orm import Session
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from typing import List
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import re
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import html
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import json
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from . import models, schemas
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from .database import Base, engine, SessionLocal, ensure_sources_column
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from .local_rag import router as local_rag_router
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from .ollama_admin import inspect_ollama_startup, pull_local_model, start_local_ollama
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from .ollama_client import list_models as ollama_list, chat as ollama_chat, chat_stream as ollama_chat_stream
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from .websearch import enrich_prompt
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# Create tables + ensure migration
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Base.metadata.create_all(bind=engine)
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ensure_sources_column(engine)
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app = FastAPI(title="LLM Desktop Backend", version="0.1.0" )
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# CORS (dev-friendly; tighten later)
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"],
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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app.include_router(local_rag_router)
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def get_db():
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db = SessionLocal()
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try:
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yield db
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finally:
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db.close()
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@app.get("/health")
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def health():
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return {"ok": True}
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@app.get("/models")
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async def get_models():
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try:
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data = await ollama_list()
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return {"models": [{"name": n} for n in data.get("models", [])]}
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except Exception as e:
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raise HTTPException(status_code=502, detail=f"Ollama not available: {e}")
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@app.get("/ollama/startup-status")
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async def ollama_startup_status():
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return await inspect_ollama_startup()
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@app.post("/ollama/start")
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async def ollama_start_route():
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try:
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return await start_local_ollama()
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except FileNotFoundError as exc:
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raise HTTPException(status_code=404, detail=str(exc)) from exc
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except RuntimeError as exc:
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raise HTTPException(status_code=400, detail=str(exc)) from exc
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@app.post("/ollama/pull")
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async def ollama_pull_route(req: schemas.OllamaPullRequest):
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try:
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return await pull_local_model(req.model)
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except FileNotFoundError as exc:
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raise HTTPException(status_code=404, detail=str(exc)) from exc
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except RuntimeError as exc:
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raise HTTPException(status_code=400, detail=str(exc)) from exc
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@app.get("/sessions", response_model=schemas.SessionsResponse)
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def get_sessions(db: Session = Depends(get_db)):
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sessions = db.query(models.ChatSession).order_by(models.ChatSession.created_at.desc()).all()
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return {"sessions": sessions}
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@app.post("/sessions", response_model=schemas.ChatSession)
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def create_session(req: schemas.CreateSessionRequest, db: Session = Depends(get_db)):
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new_session = models.ChatSession(session_id=req.session_id)
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db.add(new_session)
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db.commit()
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db.refresh(new_session)
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return new_session
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@app.get("/history", response_model=schemas.HistoryResponse)
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def history(session_id: str, db: Session = Depends(get_db)):
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session = db.query(models.ChatSession).filter(models.ChatSession.session_id == session_id).first()
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if not session:
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return {"messages": []}
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rows = (
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db.query(models.ChatMessage)
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.filter(models.ChatMessage.session_pk == session.id)
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.order_by(models.ChatMessage.created_at.asc())
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.all()
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)
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msgs = []
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for r in rows:
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sources = []
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try:
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if getattr(r, "sources_json", None):
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sources = json.loads(r.sources_json or "[]")
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except Exception:
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sources = []
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msgs.append({"role": r.role, "content": r.content, "sources": sources})
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return {"messages": msgs}
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@app.post("/chat")
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async def chat(req: schemas.ChatRequest, db: Session = Depends(get_db)):
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# Find or create session
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session = db.query(models.ChatSession).filter(models.ChatSession.session_id == req.session_id).first()
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if not session:
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session = models.ChatSession(session_id=req.session_id)
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db.add(session)
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db.commit()
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db.refresh(session)
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# Store the BASE user prompt
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user_row = models.ChatMessage(session_pk=session.id, role='user', content=req.message)
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db.add(user_row)
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db.commit()
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# Build minimal context (last 20)
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last_msgs = (
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db.query(models.ChatMessage)
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.filter(models.ChatMessage.session_pk == session.id)
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.order_by(models.ChatMessage.created_at.asc())
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.all()[-20:]
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)
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messages = [{"role": m.role, "content": m.content} for m in last_msgs]
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# Patch last user with enriched_message only for LLM call
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if req.enriched_message:
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for i in range(len(messages) - 1, -1, -1):
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if messages[i].get("role") == "user":
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messages = messages.copy()
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messages[i] = {**messages[i], "content": req.enriched_message}
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break
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# Sources to persist with the assistant reply
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sources = req.sources or []
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if req.stream:
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async def stream_generator():
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full_reply = ""
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try:
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async for chunk in ollama_chat_stream(req.model, messages):
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full_reply += chunk
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yield chunk
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except Exception as e:
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yield f"Ollama error: {e}"
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# Persist assistant reply (include sources_json)
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as_row = models.ChatMessage(
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session_pk=session.id, role='assistant', content=full_reply,
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sources_json=json.dumps(sources or [])
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)
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db.add(as_row)
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db.commit()
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return StreamingResponse(stream_generator(), media_type="text/plain")
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else:
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try:
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reply = await ollama_chat(req.model, messages)
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except Exception as e:
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raise HTTPException(status_code=502, detail=f"Ollama error: {e}")
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as_row = models.ChatMessage(
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session_pk=session.id, role='assistant', content=reply,
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sources_json=json.dumps(sources or [])
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)
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db.add(as_row)
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db.commit()
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return {"reply": reply}
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@app.post("/generate-title", response_model=schemas.GenerateTitleResponse)
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async def generate_title(req: schemas.GenerateTitleRequest, db: Session = Depends(get_db)):
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session = db.query(models.ChatSession).filter(models.ChatSession.session_id == req.session_id).first()
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if not session:
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raise HTTPException(status_code=404, detail="Session not found")
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prompt = f"Generate a very short, concise title (5 words or less) for a chat conversation that begins with this user message: \"{req.message}\". Do not use quotation marks in the title."
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try:
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title = await ollama_chat(req.model, [{"role": "user", "content": prompt}])
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except Exception as e:
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raise HTTPException(status_code=502, detail=f"Ollama error: {e}")
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print(f"Original title from LLM: {title}") # Debugging line to see the raw title
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# HTML unescape the title first to handle encoded tags
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unescaped_title = html.unescape(title)
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print(f"Unescaped title: {unescaped_title}") # Debugging line to see the unescaped title
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# Remove <think> blocks from the unescaped title
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# Use re.IGNORECASE to handle potential variations in casing (e.g., <Think>)
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cleaned_title = re.sub(r'<think>.*?</think>', '', unescaped_title, flags=re.DOTALL | re.IGNORECASE)
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print(f"Cleaned title before saving: {cleaned_title.strip()}") # Debugging line to see the cleaned title
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session.name = cleaned_title.strip() # Use .strip() to remove any leading/trailing whitespace after removal
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db.commit()
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return {"title": cleaned_title.strip()}
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@app.delete("/sessions/{session_id}")
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def delete_session(session_id: str, db: Session = Depends(get_db)):
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session = db.query(models.ChatSession).filter(models.ChatSession.session_id == session_id).first()
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if not session:
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raise HTTPException(status_code=404, detail="Session not found")
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# Delete associated messages
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db.query(models.ChatMessage).filter(models.ChatMessage.session_pk == session.id).delete()
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db.delete(session)
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db.commit()
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return {"ok": True}
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@app.put("/sessions/{session_id}/rename")
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def rename_session(session_id: str, req: schemas.GenerateTitleResponse, db: Session = Depends(get_db)):
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session = db.query(models.ChatSession).filter(models.ChatSession.session_id == session_id).first()
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if not session:
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raise HTTPException(status_code=404, detail="Session not found")
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session.name = req.title
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db.commit()
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return {"ok": True}
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@app.put("/sessions/{session_id}/messages/{index}")
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def update_user_message(session_id: str, index: int, req: schemas.EditMessageRequest, db: Session = Depends(get_db)):
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session = db.query(models.ChatSession).filter(models.ChatSession.session_id == session_id).first()
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if not session:
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raise HTTPException(status_code=404, detail="Session not found")
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msgs = (
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db.query(models.ChatMessage)
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.filter(models.ChatMessage.session_pk == session.id)
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.order_by(models.ChatMessage.created_at.asc())
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.all()
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)
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if index < 0 or index >= len(msgs):
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raise HTTPException(status_code=404, detail="Message index out of range")
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# Only user messages can be edited per spec
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if msgs[index].role != "user":
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raise HTTPException(status_code=400, detail="Only user messages can be edited")
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# Update the content
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msgs[index].content = req.message
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# Drop everything after the edited message
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for m in msgs[index + 1:]:
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db.delete(m)
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db.commit()
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return {"ok": True}
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# ADD or REPLACE this whole function
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@app.post("/sessions/{session_id}/regenerate")
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async def regenerate(session_id: str, req: schemas.RegenerateRequest, db: Session = Depends(get_db)):
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idx = req.index
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model = req.model
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stream = bool(req.stream)
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sources = req.sources or []
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session = db.query(models.ChatSession).filter(models.ChatSession.session_id == session_id).first()
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if not session:
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raise HTTPException(status_code=404, detail="Session not found")
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msgs = (
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db.query(models.ChatMessage)
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.filter(models.ChatMessage.session_pk == session.id)
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.order_by(models.ChatMessage.created_at.asc())
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.all()
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)
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if idx < 0 or idx >= len(msgs):
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raise HTTPException(status_code=400, detail="Invalid message index")
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# last user idx at/before idx
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last_user_idx = idx
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for i in range(idx, -1, -1):
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if msgs[i].role == "user":
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last_user_idx = i
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break
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# prune after that user
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if last_user_idx < len(msgs) - 1:
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for m in msgs[last_user_idx + 1:]:
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db.delete(m)
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db.commit()
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conversation = [{"role": m.role, "content": m.content} for m in msgs[: last_user_idx + 1]]
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if req.enriched_message:
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for j in range(len(conversation) - 1, -1, -1):
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if conversation[j].get("role") == "user":
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conversation = conversation.copy()
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conversation[j] = {**conversation[j], "content": req.enriched_message}
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break
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session_pk = session.id
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if stream:
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async def stream_generator():
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full_reply = ""
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try:
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async for chunk in ollama_chat_stream(model, conversation):
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full_reply += chunk
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yield chunk
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except Exception as e:
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yield f"Ollama error: {e}"
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# persist (with sources)
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try:
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db_sess = SessionLocal()
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db_sess.add(models.ChatMessage(
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session_pk=session_pk, role="assistant", content=full_reply,
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sources_json=json.dumps(sources or [])
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))
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db_sess.commit()
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finally:
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try:
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db_sess.close()
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except Exception:
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pass
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return StreamingResponse(stream_generator(), media_type="text/plain")
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try:
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reply = await ollama_chat(model, conversation)
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except Exception as e:
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raise HTTPException(status_code=502, detail=f"Ollama error: {e}")
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db.add(models.ChatMessage(
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session_pk=session_pk, role="assistant", content=reply,
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sources_json=json.dumps(sources or [])
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))
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db.commit()
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return {"reply": reply}
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# -----------------------------------------------------------------------------
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# Web search enrichment endpoint
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@app.post("/websearch", response_model=schemas.WebSearchResponse)
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async def websearch_route(req: schemas.WebSearchRequest):
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"""
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Return an enriched prompt (with citations) for a given user prompt.
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Optionally uses the last `history_limit` turns from `req.messages`.
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"""
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try:
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messages = (req.messages or [])[-int(req.history_limit or 8):]
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enriched, sources = await enrich_prompt(
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user_prompt=req.prompt,
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model=req.model,
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messages=[{"role": m.role, "content": m.content} for m in messages],
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searx_url=req.searx_url,
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engines=req.engines,
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)
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context_block = ""
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if "<websearch_context>" in enriched:
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context_block = enriched[enriched.index("<websearch_context>"):].strip()
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return {"enriched_prompt": enriched, "sources": sources, "context_block": context_block}
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except Exception:
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return {"enriched_prompt": req.prompt, "sources": [], "context_block": ""}
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# To run standalone: python -m uvicorn backend.main:app --host 127.0.0.1 --port 8000
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