FIX: Remove expired subscription for push notifications

All other errors get logged, but do not stop the system from sending further push notifications.

app/services/push_notification_pusher.rb

@@ -2,9 +2,6 @@ require_dependency 'webpush'
 
 class PushNotificationPusher
   def self.push(user, payload)
-    subscriptions(user).each do |subscription|
-      subscription = JSON.parse(subscription.data)
-
     message = {
       title: I18n.t(
         "discourse_push_notifications.popup.#{Notification.types[payload[:notification_type]]}",
@@ -20,7 +17,10 @@ class PushNotificationPusher
       url: payload[:post_url],
       hide_when_active: true
     }
-      send_notification user, subscription, message
+
+    subscriptions(user).each do |subscription|
+      subscription = JSON.parse(subscription.data)
+      send_notification(user, subscription, message)
     end
   end
 
@@ -54,7 +54,7 @@ class PushNotificationPusher
         tag: "#{Discourse.current_hostname}-subscription"
       }
 
-      send_notification user, subscription, message
+      send_notification(user, subscription, message)
     end
   end
 
@@ -74,7 +74,7 @@ class PushNotificationPusher
 
   def self.send_notification(user, subscription, message)
     begin
-      response = Webpush.payload_send(
+      Webpush.payload_send(
         endpoint: subscription["endpoint"],
         message: message.to_json,
         p256dh: subscription.dig("keys", "p256dh"),
@@ -85,8 +85,18 @@ class PushNotificationPusher
           private_key: SiteSetting.vapid_private_key
         }
       )
-    rescue Webpush::InvalidSubscription => e
+    rescue Webpush::ExpiredSubscription
-      unsubscribe user, subscription
+      unsubscribe(user, subscription)
+    rescue Webpush::ResponseError => e
+      Discourse.warn_exception(
+        e,
+        message: "Failed to send push notification",
+        env: {
+          user_id: user.id,
+          endpoint: subscription["endpoint"],
+          message: message.to_json
+        }
+      )
     end
   end
 end