Create app.py

app.py

@@ -0,0 +1,150 @@
+import os
+import platform
+import re
+import shutil
+import subprocess
+import tarfile
+import urllib.request
+from pathlib import Path
+
+import gradio as gr
+import spaces
+
+# ============================================================
+# ZeroGPU requirement: at least one module-level @spaces.GPU
+# function, or the Space fails startup with
+# "No @spaces.GPU function detected during startup".
+# Never called; the app serving port 7860 is the bansos daemon.
+# ============================================================
+
+@spaces.GPU
+def _zerogpu_startup_stub():
+    return None
+
+
+# A launched Gradio server is what triggers the ZeroGPU startup report
+# (spaces hooks gr.Blocks.launch). It serves only this stub page on 7861;
+# bansos-router itself serves port 7860.
+demo = gr.Blocks()
+with demo:
+    gr.Markdown(
+        "bansos-router runs on this Space's port 7860. "
+        "Open the root URL once the Space is Running."
+    )
+
+
+def launch_gradio_stub():
+    demo.queue().launch(
+        server_name="0.0.0.0",
+        server_port=7861,
+        prevent_thread_lock=True,
+        show_error=True,
+    )
+
+
+# ============================================================
+# bansos-router launcher (npm package, prebuilt — no build)
+# ============================================================
+
+NODE_ROOT = Path("/tmp/node22")
+PORT = "7860"
+
+
+def log(message):
+    print(f"\n[bansos HF] {message}", flush=True)
+
+
+def run(cmd, cwd=None, env=None):
+    log("+ " + " ".join(str(x) for x in cmd))
+    subprocess.run(cmd, cwd=str(cwd) if cwd else None, env=env, check=True)
+
+
+def node_arch():
+    arch = platform.machine().lower()
+    if arch in ("x86_64", "amd64"):
+        return "x64"
+    if arch in ("aarch64", "arm64"):
+        return "arm64"
+    raise RuntimeError(f"Unsupported architecture: {arch}")
+
+
+def install_node22():
+    node_bin = NODE_ROOT / "bin" / "node"
+    npm_bin = NODE_ROOT / "bin" / "npm"
+    if node_bin.exists() and npm_bin.exists():
+        log("Node.js already available.")
+        return node_bin, npm_bin
+
+    log("Finding latest Node.js 22...")
+    arch = node_arch()
+    with urllib.request.urlopen(
+        "https://nodejs.org/dist/latest-v22.x/SHASUMS256.txt", timeout=60
+    ) as response:
+        shasums = response.read().decode("utf-8")
+    match = re.search(rf"([a-f0-9]{{64}})\s+(node-v[\d.]+-linux-{arch}\.tar\.xz)", shasums)
+    if not match:
+        raise RuntimeError("Node.js 22 binary was not found.")
+    expected_hash, filename = match.group(1), match.group(2)
+    archive = Path("/tmp") / filename
+    log(f"Downloading {filename}...")
+    urllib.request.urlretrieve(f"https://nodejs.org/dist/latest-v22.x/{filename}", archive)
+
+    import hashlib
+    digest = hashlib.sha256()
+    with open(archive, "rb") as f:
+        for chunk in iter(lambda: f.read(1024 * 1024), b""):
+            digest.update(chunk)
+    if digest.hexdigest() != expected_hash:
+        raise RuntimeError("Node.js SHA256 verification failed.")
+
+    extract_root = Path("/tmp/node22-extract")
+    shutil.rmtree(extract_root, ignore_errors=True)
+    extract_root.mkdir(parents=True, exist_ok=True)
+    log("Extracting Node.js...")
+    with tarfile.open(archive, "r:xz") as tar:
+        tar.extractall(extract_root)
+    extracted = next(p for p in extract_root.iterdir() if p.is_dir())
+    shutil.rmtree(NODE_ROOT, ignore_errors=True)
+    shutil.move(str(extracted), str(NODE_ROOT))
+    log("Node.js 22 installed.")
+    return node_bin, npm_bin
+
+
+def main():
+    node_bin, npm_bin = install_node22()
+
+    env = os.environ.copy()
+    env["PATH"] = str(NODE_ROOT / "bin") + os.pathsep + env.get("PATH", "")
+    # State dir (~/.bansos). Free-tier containers reset on restart.
+    env["HOME"] = "/tmp"
+    env["PORT"] = PORT
+
+    run([str(node_bin), "--version"], env=env)
+
+    bansos_bin = NODE_ROOT / "bin" / "bansos"
+    if not bansos_bin.exists():
+        log("Installing bansos-router (prebuilt, npm)...")
+        run([str(npm_bin), "install", "--global", "--no-audit", "--no-fund", "bansos-router"], env=env)
+    else:
+        log("bansos-router already installed.")
+
+    run([str(bansos_bin), "--version"], env=env)
+
+    log("Launching Gradio stub on 7861 (ZeroGPU startup report)...")
+    launch_gradio_stub()
+
+    log(f"Starting bansos daemon on 0.0.0.0:{PORT}")
+    # Foreground (no --bg): this process IS the Space. HF proxies
+    # https://<space>.hf.space -> :7860, so allow non-loopback clients.
+    os.execvpe(
+        str(bansos_bin),
+        [str(bansos_bin), "start",
+         "--bind", "0.0.0.0", "--port", PORT,
+         "--unsafe-allow-non-loopback"],
+        env,
+    )
+
+
+if __name__ == "__main__":
+    print("\n========================================\n  bansos-router - Hugging Face Space\n========================================\n", flush=True)
+    main()