app.py

import os
import sys
import time
import threading
from fastapi import FastAPI
from fastapi.responses import PlainTextResponse
import uvicorn

PORT = int(os.getenv("PORT", "7860"))  # Spaces typically routes to app_port; PORT may or may not be set.

app = FastAPI()


def _heartbeat():
    i = 0
    while True:
        i += 1
        print(f"HEARTBEAT_STDERR i={i} ts={time.time()}", file=sys.stderr, flush=True)
        time.sleep(15)


@app.on_event("startup")
def on_startup():
    # Force both stdout and stderr output at container startup.
    print(f"BOOT_STDOUT pid={os.getpid()} ts={time.time()}", flush=True)
    print(f"BOOT_STDERR pid={os.getpid()} ts={time.time()}", file=sys.stderr, flush=True)

    t = threading.Thread(target=_heartbeat, daemon=True)
    t.start()


@app.get("/", response_class=PlainTextResponse)
def root():
    print("REQ / (stdout)", flush=True)
    print("REQ / (stderr)", file=sys.stderr, flush=True)
    return "ok\n"


@app.get("/health")
def health():
    print("REQ /health (stderr)", file=sys.stderr, flush=True)
    return {"status": "ok", "ts": time.time()}


@app.get("/crash")
def crash():
    print("REQ /crash about to raise (stderr)", file=sys.stderr, flush=True)
    raise RuntimeError("Intentional crash for log testing")


if __name__ == "__main__":
    # Important for Spaces: bind to 0.0.0.0, and use the configured port (default 7860).
    uvicorn.run(
        "app:app",
        host="0.0.0.0",
        port=PORT,
        log_level="info",
        access_log=True,
    )