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server.py — FastAPI HTTP wrapper for SQLCorrectionEnv
Exposes the OpenEnv-required endpoints: /reset, /step, /state
"""
import os
from contextlib import asynccontextmanager
from typing import Optional
from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel
from sql_env import SQLCorrectionEnv, SQLAction
# ── Request / Response schemas ────────────────────────────────
class ResetRequest(BaseModel):
difficulty: Optional[str] = "easy"
task_index: Optional[int] = None
class StepRequest(BaseModel):
corrected_query: str
# ── App setup ─────────────────────────────────────────────────
env: Optional[SQLCorrectionEnv] = None
@asynccontextmanager
async def lifespan(app: FastAPI):
global env
env = SQLCorrectionEnv(difficulty="easy")
yield
if env:
await env.close()
app = FastAPI(
title="SQL Correction RL Environment",
description="OpenEnv-compliant environment for SQL query correction tasks.",
version="1.0.0",
lifespan=lifespan,
)
app.add_middleware(
CORSMiddleware,
allow_origins=["*"],
allow_methods=["*"],
allow_headers=["*"],
)
# ── Endpoints ─────────────────────────────────────────────────
@app.post("/reset")
async def reset(request: ResetRequest = ResetRequest()):
"""Reset the environment. Returns initial observation."""
global env
difficulty = request.difficulty or "easy"
if difficulty not in ("easy", "medium", "hard"):
raise HTTPException(status_code=400, detail="difficulty must be easy, medium, or hard")
env = SQLCorrectionEnv(
difficulty=difficulty,
task_index=request.task_index,
)
obs = await env.reset()
return obs.model_dump()
@app.post("/step")
async def step(request: StepRequest):
"""Take one step. Returns observation, reward, done, info."""
global env
if env is None:
raise HTTPException(status_code=400, detail="Call /reset first.")
try:
action = SQLAction(corrected_query=request.corrected_query)
result = await env.step(action)
return result.model_dump()
except RuntimeError as e:
raise HTTPException(status_code=400, detail=str(e))
@app.get("/state")
@app.post("/state")
async def state():
"""Return current environment state."""
global env
if env is None:
return {"status": "not_initialized"}
return await env.state()
@app.get("/health")
async def health():
return {"status": "ok", "service": "sql-correction-env"}
@app.get("/")
async def root():
return {
"name": "SQL Correction RL Environment",
"version": "1.0.0",
"endpoints": ["/reset", "/step", "/state", "/health"],
"tasks": ["easy", "medium", "hard"],
}
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