Support for primary and fallback download client

frontend/src/Settings/DownloadClients/DownloadClients/DownloadClient.js

@@ -54,7 +54,8 @@ class DownloadClient extends Component {
     const {
       id,
       name,
-      enable
+      enable,
+      priority
     } = this.props;
 
     return (
@@ -80,6 +81,16 @@ class DownloadClient extends Component {
                 Disabled
               </Label>
           }
+
+          {
+            priority > 1 &&
+              <Label
+                kind={kinds.DISABLED}
+                outline={true}
+              >
+                Priority: {priority}
+              </Label>
+          }
         </div>
 
         <EditDownloadClientModalConnector
@@ -107,6 +118,7 @@ DownloadClient.propTypes = {
   id: PropTypes.number.isRequired,
   name: PropTypes.string.isRequired,
   enable: PropTypes.bool.isRequired,
+  priority: PropTypes.number.isRequired,
   onConfirmDeleteDownloadClient: PropTypes.func.isRequired
 };
 

frontend/src/Settings/DownloadClients/DownloadClients/EditDownloadClientModalContent.js

@@ -44,6 +44,7 @@ class EditDownloadClientModalContent extends Component {
       implementationName,
       name,
       enable,
+      priority,
       fields,
       message
     } = item;
@@ -115,6 +116,23 @@ class EditDownloadClientModalContent extends Component {
                   })
                 }
 
+                <FormGroup
+                  advancedSettings={advancedSettings}
+                  isAdvanced={true}
+                >
+                  <FormLabel>Client Priority</FormLabel>
+
+                  <FormInputGroup
+                    type={inputTypes.NUMBER}
+                    name="priority"
+                    helpText="Prioritize multiple Download Clients. Round-Robin is used for clients with the same priority."
+                    min={1}
+                    max={50}
+                    {...priority}
+                    onChange={onInputChange}
+                  />
+                </FormGroup>
+
               </Form>
           }
         </ModalBody>