jonandClaude Opus 4.8
6755a2477d
The backend logged 200 OK for polls the client had already timed out on. is_running() waited 2s for an Ollama that ships OFF (now 0.5s), is_available() spawned 'ollama --version' every call and that command blocks ~5s when Ollama is wedged (now cached), and both ran synchronously inside an async def, stalling the event loop on every poll while the UI polls continuously (now to_thread). Measured with Ollama's port blackholed: /status 5.89s -> 0.64s, concurrent GET / stalled -> 0.06s. Poll timeout in nexus_window.py raised 2s -> 5s for margin. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
123 lines
4.5 KiB
Python
123 lines
4.5 KiB
Python
#!/usr/bin/env python3
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"""Open the NexusOS UI in a native window.
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Uses pywebview, which renders via the WebView2 runtime on Windows (already
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present on Win10/11) -- a real app window with no browser chrome and none of the
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Edge --app profile cold-start. Blocks until the window is closed; the launcher
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waits on this process and stops the services when it exits.
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The window opens IMMEDIATELY on a loading page and navigates to the app once the
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backend answers, rather than waiting up to 40s with nothing on screen and then
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appearing. One window the whole time: nothing pops up and vanishes, and there is
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no moment where the user is left wondering whether the command did anything.
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Falls back to the default browser if pywebview/WebView2 is unavailable, staying
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alive so the launcher doesn't tear the services down underneath it.
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"""
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import sys
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import time
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import urllib.request
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URL = "http://localhost:8000"
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# Inline so it renders with no server and no asset files - the whole point is
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# that it shows before anything is listening. Colours match the app's dark UI so
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# the swap to the real page is not a flash of a different-looking window.
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LOADING_HTML = """<!doctype html>
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<html><head><meta charset="utf-8"><title>NexusOS</title><style>
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html,body{height:100%;margin:0}
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body{background:#14161a;color:#e6e8ec;display:flex;align-items:center;
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justify-content:center;font-family:Segoe UI,system-ui,sans-serif}
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.box{text-align:center}
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.ring{width:44px;height:44px;margin:0 auto 22px;border-radius:50%;
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border:3px solid #2a2f38;border-top-color:#4c8dff;
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animation:spin 1s linear infinite}
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@keyframes spin{to{transform:rotate(360deg)}}
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h1{font-size:17px;font-weight:600;margin:0 0 6px}
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p{font-size:13px;color:#8b93a1;margin:0}
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</style></head><body>
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<div class="box">
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<div class="ring"></div>
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<h1>Loading Nexus core services</h1>
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<p>Starting the memory service and backend...</p>
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</div>
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</body></html>"""
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FAILED_HTML = LOADING_HTML.replace(
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"<div class=\"ring\"></div>", ""
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).replace(
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"Loading Nexus core services", "Backend did not start"
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).replace(
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"Starting the memory service and backend...",
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"Nothing answered on :8000 after 40s. Check: ncp logs -b"
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)
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def _wait_for_backend(timeout: float = 40.0) -> bool:
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"""Poll /status until the backend answers, so the window never loads before
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the server is up (which shows a localhost error the webview won't retry)."""
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status_url = URL.rstrip("/") + "/status"
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deadline = time.time() + timeout
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while time.time() < deadline:
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try:
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# 5s, not 2: /status probes Ollama, and a wedged Ollama made it
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# slower than a 2s ceiling - the backend was up and answering 200
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# while this loop timed out on every attempt and declared it dead.
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# The server side is fixed too; this is the margin.
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with urllib.request.urlopen(status_url, timeout=5) as r:
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if r.status == 200:
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return True
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except Exception:
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time.sleep(1)
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return False
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def main() -> int:
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try:
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import webview
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except Exception as e: # pywebview not installed
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return _browser_fallback(f"pywebview unavailable ({e})")
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try:
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window = webview.create_window(
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"NexusOS",
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html=LOADING_HTML,
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width=1200,
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height=800,
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min_size=(900, 600),
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)
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def _swap_in_app(win):
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"""Runs once the GUI loop is up, so the spinner is already on screen
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while we wait. load_url replaces the loading page in place - there is
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never a second window to close."""
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if _wait_for_backend():
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win.load_url(URL)
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else:
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print("[nexus] backend not reachable on :8000 after 40s.",
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file=sys.stderr)
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win.load_html(FAILED_HTML)
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webview.start(_swap_in_app, window) # blocks until the window is closed
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return 0
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except Exception as e: # no WebView2 runtime / backend failure
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return _browser_fallback(f"native window failed ({e})")
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def _browser_fallback(reason: str) -> int:
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import webbrowser
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print(f"[nexus] {reason}; opening default browser instead.", file=sys.stderr)
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webbrowser.open(URL)
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# Stay alive so the launcher keeps the services up. The user stops NexusOS
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# by closing the launcher (or the browser tab, then the services idle out).
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try:
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while True:
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time.sleep(3600)
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except KeyboardInterrupt:
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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