Decouple resource address sorting from connection attempts (#800)

* Decouple resource address sorting from connection attempts

* Fix lint

* Move defaults to class

plexapi/myplex.py

@@ -923,6 +923,10 @@ class MyPlexResource(PlexObject):
     TAG = 'Device'
     key = 'https://plex.tv/api/resources?includeHttps=1&includeRelay=1'
 
+    # Default order to prioritize available resource connections
+    DEFAULT_LOCATION_ORDER = ['local', 'remote', 'relay']
+    DEFAULT_SCHEME_ORDER = ['https', 'http']
+
     def _loadData(self, data):
         self._data = data
         self.name = data.attrib.get('name')
@@ -947,38 +951,64 @@ def _loadData(self, data):
         self.ownerid = utils.cast(int, data.attrib.get('ownerId', 0))
         self.sourceTitle = data.attrib.get('sourceTitle')  # owners plex username.
 
-    def connect(self, ssl=None, timeout=None):
-        """ Returns a new :class:`~plexapi.server.PlexServer` or :class:`~plexapi.client.PlexClient` object.
+    def preferred_connections(
+        self,
+        ssl=None,
+        timeout=None,
+        locations=DEFAULT_LOCATION_ORDER,
+        schemes=DEFAULT_SCHEME_ORDER,
+    ):
+        """ Returns a sorted list of the available connection addresses for this resource.
             Often times there is more than one address specified for a server or client.
-            This function will prioritize local connections before remote or relay and HTTPS before HTTP.
-            After trying to connect to all available addresses for this resource and
-            assuming at least one connection was successful, the PlexServer object is built and returned.
+            Default behavior will prioritize local connections before remote or relay and HTTPS before HTTP.
 
             Parameters:
                 ssl (bool, optional): Set True to only connect to HTTPS connections. Set False to
                     only connect to HTTP connections. Set None (default) to connect to any
                     HTTP or HTTPS connection.
                 timeout (int, optional): The timeout in seconds to attempt each connection.
-
-            Raises:
-                :exc:`~plexapi.exceptions.NotFound`: When unable to connect to any addresses for this resource.
         """
-        # Keys in the order we want the connections to be sorted
-        locations = ['local', 'remote', 'relay']
-        schemes = ['https', 'http']
         connections_dict = {location: {scheme: [] for scheme in schemes} for location in locations}
         for connection in self.connections:
             # Only check non-local connections unless we own the resource
             if self.owned or (not self.owned and not connection.local):
                 location = 'relay' if connection.relay else ('local' if connection.local else 'remote')
-                connections_dict[location]['http'].append(connection.httpuri)
-                connections_dict[location]['https'].append(connection.uri)
+                if location not in locations:
+                    continue
+                if 'http' in schemes:
+                    connections_dict[location]['http'].append(connection.httpuri)
+                if 'https' in schemes:
+                    connections_dict[location]['https'].append(connection.uri)
         if ssl is True: schemes.remove('http')
         elif ssl is False: schemes.remove('https')
         connections = []
         for location in locations:
             for scheme in schemes:
                 connections.extend(connections_dict[location][scheme])
+        return connections
+
+    def connect(
+        self,
+        ssl=None,
+        timeout=None,
+        locations=DEFAULT_LOCATION_ORDER,
+        schemes=DEFAULT_SCHEME_ORDER,
+    ):
+        """ Returns a new :class:`~plexapi.server.PlexServer` or :class:`~plexapi.client.PlexClient` object.
+            Uses `MyPlexResource.preferred_connections()` to generate the priority order of connection addresses.
+            After trying to connect to all available addresses for this resource and
+            assuming at least one connection was successful, the PlexServer object is built and returned.
+
+            Parameters:
+                ssl (bool, optional): Set True to only connect to HTTPS connections. Set False to
+                    only connect to HTTP connections. Set None (default) to connect to any
+                    HTTP or HTTPS connection.
+                timeout (int, optional): The timeout in seconds to attempt each connection.
+
+            Raises:
+                :exc:`~plexapi.exceptions.NotFound`: When unable to connect to any addresses for this resource.
+        """
+        connections = self.preferred_connections(ssl, timeout, locations, schemes)
         # Try connecting to all known resource connections in parellel, but
         # only return the first server (in order) that provides a response.
         cls = PlexServer if 'server' in self.provides else PlexClient