1st try of the backend

This commit is contained in:
2026-01-19 22:02:50 +01:00
commit b90621f665
4 changed files with 125 additions and 0 deletions

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backend/app.py Normal file
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from fastapi import FastAPI
from pydantic import BaseModel
import json
from llm import ollama_chat
from tools import web_search, electronics_ohm, run_command
app = FastAPI()
class ChatIn(BaseModel):
message: str
model: str = "llama3.1" # change si besoin
mode: str = "AUTO" # AUTO / DEV / ELEC / INFRA / WEB
SYSTEM = """Tu es un assistant personnel pour Nino.
Tu dois être pratique, structuré, et orienté action.
Si une demande nécessite une recherche web, utilise l'outil web_search.
Si c'est de l'électronique, tu peux utiliser electronics_ohm ou demander les valeurs manquantes.
Si une commande système est utile, propose run_command mais explique ce que ça fait.
Réponds en français.
"""
TOOLS_SPEC = """
Outils disponibles (à appeler en JSON strict sur une seule ligne) :
1) web_search: {"tool":"web_search","query":"...","max_results":5}
2) electronics_ohm: {"tool":"electronics_ohm","V":null,"I":0.02,"R":220}
3) run_command: {"tool":"run_command","cmd":"docker ps"}
Si tu appelles un outil, n'écris QUE le JSON.
"""
@app.post("/chat")
async def chat(inp: ChatIn):
messages = [
{"role": "system", "content": SYSTEM},
{"role": "system", "content": TOOLS_SPEC},
{"role": "user", "content": inp.message},
]
# 1) le modèle choisit soit de répondre, soit d'appeler un outil
first = (await ollama_chat(inp.model, messages)).strip()
# 2) si JSON tool-call
if first.startswith("{") and '"tool"' in first:
call = json.loads(first)
tool = call["tool"]
if tool == "web_search":
res = web_search(call["query"], call.get("max_results", 5))
messages.append({"role": "assistant", "content": first})
messages.append({"role": "tool", "content": json.dumps(res, ensure_ascii=False)})
final = await ollama_chat(inp.model, messages)
return {"answer": final, "tool_used": "web_search", "tool_result": res}
if tool == "electronics_ohm":
res = electronics_ohm(call.get("V"), call.get("I"), call.get("R"))
messages.append({"role": "assistant", "content": first})
messages.append({"role": "tool", "content": json.dumps(res, ensure_ascii=False)})
final = await ollama_chat(inp.model, messages)
return {"answer": final, "tool_used": "electronics_ohm", "tool_result": res}
if tool == "run_command":
res = run_command(call["cmd"])
messages.append({"role": "assistant", "content": first})
messages.append({"role": "tool", "content": json.dumps(res, ensure_ascii=False)})
final = await ollama_chat(inp.model, messages)
return {"answer": final, "tool_used": "run_command", "tool_result": res}
# sinon réponse directe
return {"answer": first, "tool_used": None}

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backend/llm.py Normal file
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import httpx
OLLAMA_URL = "http://localhost:11434"
async def ollama_chat(model: str, messages: list[dict]) -> str:
async with httpx.AsyncClient(timeout=120) as client:
r = await client.post(
f"{OLLAMA_URL}/api/chat",
json={"model": model, "messages": messages, "stream": False},
)
r.raise_for_status()
data = r.json()
return data["message"]["content"]

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backend/requirements.txt Normal file
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fastapi
uvicorn
httpx
pydantic
duckduckgo-search

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backend/tool.py Normal file
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from duckduckgo_search import DDGS
import subprocess
import shlex
import math
def web_search(query: str, max_results: int = 5) -> list[dict]:
out = []
with DDGS() as ddgs:
for r in ddgs.text(query, max_results=max_results):
out.append({"title": r.get("title"), "url": r.get("href"), "snippet": r.get("body")})
return out
def electronics_ohm(V: float | None, I: float | None, R: float | None) -> dict:
# résout V=I*R si une variable est None
if [V, I, R].count(None) != 1:
return {"error": "Donne exactement 2 valeurs (ex: V et R) et laisse lautre à null."}
if V is None:
return {"V": I * R}
if I is None:
return {"I": V / R}
return {"R": V / I}
SAFE_COMMANDS = {"git", "docker", "docker-compose", "python", "pip", "ls", "cat", "grep", "tail", "journalctl"}
def run_command(cmd: str) -> dict:
# garde-fou minimal : nautorise que certaines commandes
parts = shlex.split(cmd)
if not parts:
return {"error": "Commande vide."}
if parts[0] not in SAFE_COMMANDS:
return {"error": f"Commande interdite: {parts[0]} (liste: {sorted(SAFE_COMMANDS)})"}
try:
p = subprocess.run(parts, capture_output=True, text=True, timeout=25)
return {"returncode": p.returncode, "stdout": p.stdout[-4000:], "stderr": p.stderr[-4000:]}
except Exception as e:
return {"error": str(e)}