Removed get_plugin utils method from web server, it messes up with also with the reentrant locks as it runs in another process. Refactored Snapcast frontend to get the backend hosts asynchronously through a plugin method

platypush/backend/http/__init__.py

@@ -15,7 +15,7 @@ from flask import Flask, Response, abort, jsonify, request as http_request, \
 from redis import Redis
 
 from platypush.config import Config
-from platypush.context import get_backend, get_plugin, get_or_create_event_loop
+from platypush.context import get_backend, get_or_create_event_loop
 from platypush.message import Message
 from platypush.message.event import Event, StopEvent
 from platypush.message.event.web.widget import WidgetUpdateEvent
@@ -550,9 +550,4 @@ class HttpUtils(object):
         return json.loads(data)
 
 
-    @classmethod
-    def get_plugin(cls, plugin):
-        return get_plugin(plugin)
-
-
 # vim:sw=4:ts=4:et:

platypush/backend/http/static/js/music.snapcast.js

@@ -225,6 +225,15 @@ $(document).ready(function() {
     };
 
     var redraw = function() {
+        execute(
+            {
+                type: 'request',
+                action: 'music.snapcast.get_backend_hosts',
+            },
+
+            (response) => {
+                window.config = window.config || {};
+                window.config.snapcast_hosts = response.response.output;
                 var promises = [];
 
                 for (var host of Object.keys(window.config.snapcast_hosts)) {
@@ -251,6 +260,8 @@ $(document).ready(function() {
                 }).then(function() {
                     initBindings();
                 });
+            }
+        );
     };
 
     var initBindings = function() {

platypush/backend/http/templates/plugins/music.snapcast.html

@@ -1,11 +1,6 @@
 <script type="text/javascript" src="{{ url_for('static', filename='js/music.snapcast.js') }}"></script>
 <link rel="stylesheet" href="{{ url_for('static', filename='css/music.snapcast.css') }}"></script>
 
-<script type="text/javascript">
-    window.config = window.config || {};
-    window.config.snapcast_hosts = JSON.parse('{{ utils.get_plugin("music.snapcast").backend_hosts_json | safe }}');
-</script>
-
 <div id="snapcast-host-modal" class="modal snapcast-modal">
     <div class="modal-container">
         <div class="modal-header"></div>

platypush/plugins/music/snapcast.py

@@ -40,10 +40,6 @@ class MusicSnapcastPlugin(Plugin):
         backend_ports = backend.ports if backend else [self.port]
         self.backend_hosts = backend_hosts
         self.backend_ports = backend_ports
-        self.backend_hosts_json = json.dumps({
-            backend_hosts[i]: backend_ports[i]
-            for i in range(len(backend_hosts))
-        })
 
     def _get_req_id(self):
         with self._latest_req_id_lock:
@@ -535,4 +531,16 @@ class MusicSnapcastPlugin(Plugin):
             except: pass
 
 
+    @action
+    def get_backend_hosts(self):
+        """
+        :return: A dict with the Snapcast hosts configured on the backend
+            in the format host -> port
+        """
+
+        hosts = {}
+        for i in range(len(self.backend_hosts)):
+            hosts[self.backend_hosts[i]] = self.backend_ports[i]
+        return hosts
+
 # vim:sw=4:ts=4:et: