restrukturierung

raspi/Dashboard.py

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+"""
+Dashboard.py
+────────────
+Flask app factory for the Smart Mirror dashboard.
+
+Routes
+------
+  GET  /            → Jinja2 rendered dashboard (templates/dashboard.html)
+  GET  /api/data    → JSON snapshot from USBRead (status + ring-buffer)
+  GET  /api/alerts  → JSON log of dispatched alert events
+
+Start via Gunicorn:
+    gunicorn -c gunicorn.conf.py "Dashboard:create_app()"
+
+Or for development:
+    python Dashboard.py
+"""
+
+import json
+import threading
+from collections import deque
+from datetime import datetime
+from pathlib import Path
+
+from flask import Flask, jsonify, render_template
+
+import Notification
+import USBRead
+
+# ── Resolve paths relative to this file ──────────────────────────
+BASE_DIR      = Path(__file__).parent
+SETTINGS_PATH = BASE_DIR / "settings.json"
+
+
+# ── Settings loader ───────────────────────────────────────────────
+
+def load_settings() -> dict:
+    with open(SETTINGS_PATH, encoding="utf-8") as fh:
+        return json.load(fh)
+
+
+# ── Flask app factory ─────────────────────────────────────────────
+
+def create_app() -> Flask:
+    settings   = load_settings()
+    dash_cfg   = settings["dashboard"]
+    sensor_cfg = settings.get("sensors", [])
+
+    # ── Init subsystems ───────────────────────────────────────────
+    USBRead.init(settings["usb"])
+    USBRead.start_reader()
+
+    Notification.init(settings)
+    Notification.attach_to_usb()
+
+    # ── In-memory alert log (visible in dashboard) ────────────────
+    alert_log  : deque = deque(maxlen=500)
+    alert_lock : threading.Lock = threading.Lock()
+
+    # Wrap Notification.send_alert so every outbound alert is also
+    # appended to the dashboard log.
+    _orig_send = Notification.send_alert
+
+    def _logging_send(subject: str, body: str) -> None:
+        with alert_lock:
+            alert_log.append({
+                "ts":      datetime.now().isoformat(timespec="milliseconds"),
+                "subject": subject,
+                "body":    body,
+            })
+        _orig_send(subject, body)
+
+    Notification.send_alert = _logging_send
+
+    # ── Build Flask app ───────────────────────────────────────────
+    app = Flask(
+        __name__,
+        template_folder = str(BASE_DIR / "templates"),
+        static_folder   = str(BASE_DIR / "static"),
+    )
+
+    # Pre-serialise sensor config once (passed to template as JSON
+    # data-attribute so dashboard.js can read it without an extra request)
+    sensors_json = json.dumps(sensor_cfg)
+
+    # ── Routes ────────────────────────────────────────────────────
+
+    @app.route("/")
+    def index():
+        return render_template(
+            "dashboard.html",
+            title        = dash_cfg.get("title", "Smart Mirror"),
+            sensors      = sensor_cfg,
+            sensors_json = sensors_json,
+            poll_ms      = dash_cfg.get("poll_interval_ms", 800),
+        )
+
+    @app.route("/api/data")
+    def api_data():
+        return jsonify(USBRead.get_snapshot())
+
+    @app.route("/api/alerts")
+    def api_alerts():
+        with alert_lock:
+            return jsonify(list(alert_log))
+
+    return app
+
+
+# ── Dev entry point ───────────────────────────────────────────────
+if __name__ == "__main__":
+    settings = load_settings()
+    dash     = settings["dashboard"]
+    app      = create_app()
+    app.run(
+        host  = dash.get("host",  "0.0.0.0"),
+        port  = dash.get("port",  80),
+        debug = False,
+    )