| """Render check for Streamlit apps, which expose no API to call: load the page in headless Chromium, wait for the |
| app to render, and require visible content and no Streamlit exception box. Saves a screenshot as the output. |
| usage: probe_streamlit.py URL [OUT_DIR]; prints one JSON line like probe.py.""" |
| import json, sys |
| from pathlib import Path |
| from playwright.sync_api import sync_playwright |
|
|
| url, outdir = sys.argv[1], (Path(sys.argv[2]) if len(sys.argv) > 2 and sys.argv[2] else None) |
| res = {"endpoint": "page render", "ok": False, "inputs": [], "via": "browser"} |
| try: |
| with sync_playwright() as p: |
| b = p.chromium.launch() |
| pg = b.new_page(viewport={"width": 1280, "height": 900}) |
| pg.goto(url, wait_until="domcontentloaded", timeout=120_000) |
| pg.wait_for_selector('[data-testid="stApp"], .stApp', timeout=120_000) |
| pg.wait_for_timeout(25_000) |
| exc = pg.locator('[data-testid="stException"], .stException').count() |
| running = pg.locator('[data-testid="stStatusWidget"]').count() |
| text = pg.locator('[data-testid="stApp"], .stApp').first.inner_text(timeout=10_000) |
| files = [] |
| if outdir: |
| outdir.mkdir(parents=True, exist_ok=True) |
| pg.screenshot(path=str(outdir / "page_render.png")) |
| files = ["page_render.png"] |
| ok = exc == 0 and len(text.strip()) > 40 |
| res.update(ok=ok, output_summary=text.strip()[:400], files=files, |
| **({} if ok else {"error": f"{exc} Streamlit exception box(es)" if exc else "page rendered almost no content"})) |
| if running: |
| res["note"] = "script still running at check time" |
| b.close() |
| except Exception as e: |
| res["error"] = repr(e)[:400] |
| print(json.dumps(res), flush=True) |
|
|
