refactor(signal): replace Apprise with httpx

python/signal_alert.py

@@ -5,10 +5,13 @@ from __future__ import annotations
 import logging
 from os import getenv
 
-from apprise import Apprise
+import httpx
 
 logger = logging.getLogger(__name__)
 
+SIGNAL_API_URL = "http://localhost:8989/v2/send"
+SIGNAL_API_TIMEOUT = 4.0
+
 
 def signal_alert(body: str, title: str = "") -> None:
     """Send a signal alert.
@@ -17,14 +20,31 @@ def signal_alert(body: str, title: str = "") -> None:
         body (str): The body of the alert.
         title (str, optional): The title of the alert. Defaults to "".
     """
-    apprise_client = Apprise()
-
     from_phone = getenv("SIGNAL_ALERT_FROM_PHONE")
     to_phone = getenv("SIGNAL_ALERT_TO_PHONE")
     if not from_phone or not to_phone:
         logger.info("SIGNAL_ALERT_FROM_PHONE or SIGNAL_ALERT_TO_PHONE not set")
         return
 
-    apprise_client.add(f"signal://localhost:8989/{from_phone}/{to_phone}")
+    # Apprise's Signal integration did not support titles, so preserve that behavior.
+    if title:
+        logger.debug("Signal does not support notification titles; ignoring title")
 
-    apprise_client.notify(title=title, body=body)
+    try:
+        response = httpx.post(
+            SIGNAL_API_URL,
+            json={
+                "message": body,
+                "number": from_phone,
+                "recipients": [to_phone],
+                "text_mode": "normal",
+            },
+            timeout=SIGNAL_API_TIMEOUT,
+            follow_redirects=True,
+        )
+    except httpx.HTTPError:
+        logger.exception("Unable to contact the Signal API")
+        return
+
+    if response.status_code not in {httpx.codes.OK, httpx.codes.CREATED}:
+        logger.error("Signal API returned HTTP status %d", response.status_code)