Andrew Charlwood
63 lines
1.7 KiB
Python
63 lines
1.7 KiB
Python
"""Desktop entry point: Dash app inside a pywebview native window."""
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import sys
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import socket
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import threading
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import time
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from pathlib import Path
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# Ensure project root is on sys.path so that core/, data_processing/, etc. are importable
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_project_root = str(Path(__file__).resolve().parent)
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if _project_root not in sys.path:
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sys.path.insert(0, _project_root)
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import webview
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from dash_app.app import app
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def find_free_port(start: int = 8050) -> int:
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"""Find the first available port starting from *start*."""
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for port in range(start, start + 100):
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with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
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try:
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s.bind(("127.0.0.1", port))
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return port
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except OSError:
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continue
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raise RuntimeError("No free port found")
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def wait_for_server(port: int, timeout: float = 30.0) -> None:
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"""Block until the Dash server accepts connections."""
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deadline = time.monotonic() + timeout
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while time.monotonic() < deadline:
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with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
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if s.connect_ex(("127.0.0.1", port)) == 0:
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return
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time.sleep(0.1)
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raise TimeoutError(f"Server did not start within {timeout}s")
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def main() -> None:
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port = find_free_port()
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server_thread = threading.Thread(
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target=app.run,
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kwargs={"debug": False, "port": port, "use_reloader": False},
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daemon=True,
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)
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server_thread.start()
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wait_for_server(port)
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webview.create_window(
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"NHS Pathway Analysis",
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f"http://127.0.0.1:{port}",
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width=1400,
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height=900,
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)
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webview.start()
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if __name__ == "__main__":
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main()
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