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c27eaf1 a267a62 c27eaf1 a267a62 c27eaf1 a267a62 c27eaf1 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 | """FastAPI application — consultant chatbot microservice.
Endpoints:
POST /chat — Main chat endpoint
GET /sessions — List all sessions
POST /sessions/new — Create a new session
GET /sessions/{session_id} — Get session details + history
DELETE /sessions/{session_id} — Delete a session
GET /health — Health check
The frontend is served as static files from ../frontend/.
"""
from __future__ import annotations
import os
import uuid
from contextlib import asynccontextmanager
from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse
from fastapi.staticfiles import StaticFiles
from models import (
ChatRequest,
ChatResponse,
Message,
NewSessionResponse,
Phase,
SessionInfo,
SessionState,
)
from storage import delete_session, init_db, list_sessions, load_session, save_session
from graph import run_consultation
# ---------------------------------------------------------------------------
# Greeting message — shown at the start of every new session
# ---------------------------------------------------------------------------
GREETING_MESSAGE = (
"**Welcome to Stacklogix.** I'm your consultant for this session. 👋\n\n"
"Whether you have a **clear request** (e.g. build a product or fix an issue) or a **problem** "
"(e.g. something isn't working as you'd like), I'll ask a few questions to understand your needs. "
"Our team will then follow up with you.\n\n"
"**What would you like to achieve or what do you need help with?**"
)
# ---------------------------------------------------------------------------
# App lifecycle
# ---------------------------------------------------------------------------
@asynccontextmanager
async def lifespan(app: FastAPI):
await init_db()
yield
app = FastAPI(
title="Stacklogix Consultant Chatbot API",
description="Stacklogix requirement-collection chatbot — gathers client requirements and explains how Stacklogix will address them. LangGraph + Groq.",
version="1.0.0",
lifespan=lifespan,
)
# CORS — allow all origins for microservice usage
app.add_middleware(
CORSMiddleware,
allow_origins=["*"],
allow_credentials=True,
allow_methods=["*"],
allow_headers=["*"],
)
# ---------------------------------------------------------------------------
# Chat endpoint
# ---------------------------------------------------------------------------
@app.post("/chat", response_model=ChatResponse)
async def chat(req: ChatRequest):
"""Process a user message and return the consultant's response."""
# Load or create session
session = await load_session(req.session_id)
if session is None:
session = SessionState(session_id=req.session_id)
# Run consultation graph
result = await run_consultation(session, req.message)
# Persist updated state
await save_session(req.session_id, result["session_state"])
return ChatResponse(
reply=result["assistant_reply"],
phase=result["new_phase"],
confidence=result["new_confidence"],
understanding=result["new_understanding"],
)
# ---------------------------------------------------------------------------
# Session management endpoints
# ---------------------------------------------------------------------------
@app.get("/sessions")
async def get_sessions():
"""List all active sessions."""
sessions = await list_sessions()
return {"sessions": sessions}
@app.post("/sessions/new")
async def create_session():
"""Create a new session with an opening greeting message."""
session_id = str(uuid.uuid4())
state = SessionState(
session_id=session_id,
messages=[Message(role="assistant", content=GREETING_MESSAGE)],
)
await save_session(session_id, state)
return {
"session_id": session_id,
"greeting": GREETING_MESSAGE,
}
@app.get("/sessions/{session_id}")
async def get_session(session_id: str):
"""Get full session details including conversation history."""
session = await load_session(session_id)
if session is None:
raise HTTPException(status_code=404, detail="Session not found")
return session.model_dump()
@app.delete("/sessions/{session_id}")
async def remove_session(session_id: str):
"""Delete a session."""
deleted = await delete_session(session_id)
if not deleted:
raise HTTPException(status_code=404, detail="Session not found")
return {"status": "deleted", "session_id": session_id}
# ---------------------------------------------------------------------------
# Health check
# ---------------------------------------------------------------------------
@app.get("/health")
async def health():
return {"status": "healthy", "service": "stacklogix-chatbot"}
# ---------------------------------------------------------------------------
# Serve frontend static files
# ---------------------------------------------------------------------------
FRONTEND_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "frontend")
if os.path.isdir(FRONTEND_DIR):
@app.get("/")
async def serve_index():
return FileResponse(os.path.join(FRONTEND_DIR, "index.html"))
app.mount("/static", StaticFiles(directory=FRONTEND_DIR), name="static")
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