api.py

from fastapi import FastAPI, Response, HTTPException
from pydantic import BaseModel
from typing import Union, Dict, Any
import os
import io
import sys
from handler import EndpointHandler

# Add debug logging
def debug_log(message):
    print(f"DEBUG: {message}")
    sys.stdout.flush()

debug_log("Starting API initialization")

app = FastAPI()

# Initialize the handler with the model directory
model_dir = os.environ.get("MODEL_DIR", "/code/diffsketcher")
debug_log(f"Using model_dir: {model_dir}")
handler = EndpointHandler(model_dir)
debug_log("Handler initialized")

class TextRequest(BaseModel):
    inputs: Union[str, Dict[str, Any]]

@app.get("/")
def read_root():
    debug_log("Root endpoint called")
    return {"message": "DiffSketcher Vector Graphics Generation API"}

@app.post("/")
async def generate(request: TextRequest):
    try:
        debug_log(f"Generate endpoint called with request: {request}")
        
        # Call the handler
        result = handler(request.dict())
        debug_log("Handler returned result")
        
        # If the result is a PIL Image, convert it to bytes
        if hasattr(result, "save"):
            debug_log("Result is a PIL Image, converting to bytes")
            img_byte_arr = io.BytesIO()
            result.save(img_byte_arr, format="PNG")
            img_byte_arr.seek(0)
            
            # Return the image as a response
            debug_log("Returning image response")
            return Response(content=img_byte_arr.getvalue(), media_type="image/png")
        else:
            # Return the result as JSON
            debug_log(f"Returning JSON response: {result}")
            return result
    except Exception as e:
        debug_log(f"Error in generate endpoint: {e}")
        import traceback
        debug_log(traceback.format_exc())
        raise HTTPException(status_code=500, detail=str(e))