fbshipit-source-id: c71048dfea2a03cf83650b55aa9d1e463251920c

src/reducers/index.js

@@ -8,6 +8,7 @@
 import {combineReducers} from 'redux';
 import application from './application.js';
 import connections from './connections.js';
+import server from './server.js';
 import pluginStates from './pluginStates.js';
 import type {
   State as ApplicationState,
@@ -21,6 +22,7 @@ import type {
   State as PluginsState,
   Action as PluginsAction,
 } from './pluginStates.js';
+import type {State as ServerState, Action as ServerAction} from './server.js';
 import type {Store as ReduxStore} from 'redux';
 
 export type Store = ReduxStore<
@@ -28,8 +30,14 @@ export type Store = ReduxStore<
     application: ApplicationState,
     connections: DevicesState,
     pluginStates: PluginsState,
+    server: ServerState,
   },
-  ApplicationAction | DevicesAction | PluginsAction,
+  ApplicationAction | DevicesAction | PluginsAction | ServerAction,
 >;
 
-export default combineReducers({application, connections, pluginStates});
+export default combineReducers({
+  application,
+  connections,
+  pluginStates,
+  server,
+});

src/reducers/server.js

@@ -0,0 +1,54 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+
+export type State = {
+  error: ?string,
+  clients: Array<Client>,
+};
+
+export type Action =
+  | {
+      type: 'SERVER_ERROR',
+      payload: ?string,
+    }
+  | {
+      type: 'NEW_CLIENT',
+      payload: Client,
+    }
+  | {
+      type: 'CLIENT_REMOVED',
+      payload: string,
+    };
+
+const INITIAL_STATE: State = {
+  error: null,
+  clients: [],
+};
+
+export default function reducer(
+  state: State = INITIAL_STATE,
+  action: Action,
+): State {
+  if (action.type === 'NEW_CLIENT') {
+    const {payload} = action;
+    return {
+      ...state,
+      clients: state.clients.concat(payload),
+    };
+  } else if (action.type === 'CLIENT_REMOVED') {
+    const {payload} = action;
+    return {
+      ...state,
+      clients: state.clients.filter((client: Client) => client.id !== payload),
+    };
+  } else if (action.type === 'SERVER_ERROR') {
+    const {payload} = action;
+    return {...state, error: payload};
+  } else {
+    return state;
+  }
+}