various tidyups

scripts/flounder_motioneye_snapshots.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+"""Refresh Flounder's local MotionEye preview images."""
+
+import os
+from pathlib import Path
+import sys
+import time
+from urllib.error import URLError
+from urllib.request import urlopen
+
+
+OUTPUTS = (
+    "front-door.jpg",
+    "driveway.jpg",
+    "garage.jpg",
+    "bike-shed.jpg",
+    "caravan.jpg",
+)
+OUTPUT_DIR = Path(os.environ.get("HASS_CONFIG", "/config")) / "www/flounder"
+HASS_URL = os.environ.get("HASS_URL", "http://127.0.0.1:8123")
+
+
+def download(url_path: str, destination: Path) -> bool:
+    url = f"{HASS_URL}{url_path}"
+    for attempt in range(2):
+        try:
+            with urlopen(url, timeout=4) as response:
+                image = response.read()
+            if image.startswith(b"\xff\xd8") and image.endswith(b"\xff\xd9"):
+                temporary = destination.with_suffix(".tmp")
+                temporary.write_bytes(image)
+                os.replace(temporary, destination)
+                return True
+        except (OSError, TimeoutError, URLError):
+            pass
+        if attempt == 0:
+            time.sleep(2)
+    return False
+
+
+def main() -> int:
+    arguments = sys.argv[1:]
+    outputs = OUTPUTS
+    if arguments and arguments[0] == "--primary":
+        arguments = arguments[1:]
+        outputs = OUTPUTS[:3]
+
+    if len(arguments) != len(outputs):
+        return 2
+
+    OUTPUT_DIR.mkdir(parents=True, exist_ok=True)
+    failures = 0
+    for url_path, filename in zip(arguments, outputs, strict=True):
+        if not download(url_path, OUTPUT_DIR / filename):
+            failures += 1
+        time.sleep(2)
+    return 1 if failures else 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())