From a349b45ba49347ed2acf1ddf940f67737fbec9f3 Mon Sep 17 00:00:00 2001
From: Fabio Manganiello <blacklight86@gmail.com>
Date: Thu, 10 Jan 2019 11:52:39 +0100
Subject: [PATCH] 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            |  7 +--
 .../backend/http/static/js/music.snapcast.js  | 55 +++++++++++--------
 .../templates/plugins/music.snapcast.html     |  5 --
 platypush/plugins/music/snapcast.py           | 16 ++++--
 4 files changed, 46 insertions(+), 37 deletions(-)

diff --git a/platypush/backend/http/__init__.py b/platypush/backend/http/__init__.py
index c463b29448..7ac371d68f 100644
--- a/platypush/backend/http/__init__.py
+++ b/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:
diff --git a/platypush/backend/http/static/js/music.snapcast.js b/platypush/backend/http/static/js/music.snapcast.js
index 5c57ec72b3..d22e93ce3a 100644
--- a/platypush/backend/http/static/js/music.snapcast.js
+++ b/platypush/backend/http/static/js/music.snapcast.js
@@ -225,32 +225,43 @@ $(document).ready(function() {
     };
 
     var redraw = function() {
-        var promises = [];
+        execute(
+            {
+                type: 'request',
+                action: 'music.snapcast.get_backend_hosts',
+            },
 
-        for (var host of Object.keys(window.config.snapcast_hosts)) {
-            promises.push(
-                execute({
-                    type: 'request',
-                    action: 'music.snapcast.status',
-                    args: {
-                        host: host,
-                        port: window.config.snapcast_hosts[host],
+            (response) => {
+                window.config = window.config || {};
+                window.config.snapcast_hosts = response.response.output;
+                var promises = [];
+
+                for (var host of Object.keys(window.config.snapcast_hosts)) {
+                    promises.push(
+                        execute({
+                            type: 'request',
+                            action: 'music.snapcast.status',
+                            args: {
+                                host: host,
+                                port: window.config.snapcast_hosts[host],
+                            }
+                        })
+                    );
+                }
+
+                $.when.apply($, promises)
+                .done(function() {
+                    var statuses = [];
+                    for (var status of arguments) {
+                        statuses.push(status[0].response.output);
                     }
-                })
-            );
-        }
 
-        $.when.apply($, promises)
-        .done(function() {
-            var statuses = [];
-            for (var status of arguments) {
-                statuses.push(status[0].response.output);
+                    update(statuses);
+                }).then(function() {
+                    initBindings();
+                });
             }
-
-            update(statuses);
-        }).then(function() {
-            initBindings();
-        });
+        );
     };
 
     var initBindings = function() {
diff --git a/platypush/backend/http/templates/plugins/music.snapcast.html b/platypush/backend/http/templates/plugins/music.snapcast.html
index 16b48cbb0d..2aedf3520c 100644
--- a/platypush/backend/http/templates/plugins/music.snapcast.html
+++ b/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>
diff --git a/platypush/plugins/music/snapcast.py b/platypush/plugins/music/snapcast.py
index 975012d611..8a54d410d4 100644
--- a/platypush/plugins/music/snapcast.py
+++ b/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: