output data on stdout

Summary: listening on `SIGINT` events and putting the serialized store to stdout.

Reviewed By: passy

Differential Revision: D13878051

fbshipit-source-id: 19c1d857a299ed9a474605169c54e5359e0515bd

headless/index.js

@@ -13,6 +13,7 @@ import path from 'path';
 // $FlowFixMe this file exist, trust me, flow!
 import setup from '../static/setup.js';
 import yargs from 'yargs';
+import {serializeStore} from '../src/utils/exportData.js';
 
 yargs
   .usage('$0 [args]')
@@ -96,4 +97,11 @@ function startFlipper({
   const logger = new Logger(store);
   init(store);
   dispatcher(store, logger);
+
+  process.on('SIGINT', () => {
+    originalConsole.log(
+      JSON.stringify(serializeStore(store.getState()), null, 2),
+    );
+    process.exit();
+  });
 }

src/reducers/index.js

@@ -45,16 +45,16 @@ type Actions =
   | PluginsAction
   | {|type: 'INIT'|};
 
-export type Store = ReduxStore<
+export type State = {|
-  {|
+  application: ApplicationState,
-    application: ApplicationState,
+  connections: DevicesState,
-    connections: DevicesState,
+  pluginStates: PluginStatesState,
-    pluginStates: PluginStatesState,
+  notifications: NotificationsState,
-    notifications: NotificationsState,
+  plugins: PluginsState,
-    plugins: PluginsState,
+|};
-  |},
+
-  Actions,
+// $FlowFixMe introduced when removing $Subtype/$Supertype
->;
+export type Store = ReduxStore<State, Actions>;
 
 export default combineReducers<_, Actions>({
   application,

src/utils/exportData.js

@@ -10,6 +10,7 @@ import type {State as PluginStates} from '../reducers/pluginStates';
 import type {PluginNotification} from '../reducers/notifications.js';
 import type {ClientExport} from '../Client.js';
 import type {State as PluginStatesState} from '../reducers/pluginStates';
+import type {State} from '../reducers/index';
 import {FlipperDevicePlugin} from '../plugin.js';
 import {default as BaseDevice} from '../devices/BaseDevice';
 
@@ -118,21 +119,24 @@ export const processStore = (
   return null;
 };
 
-export const exportStoreToFile = (data: Store): Promise<void> => {
+export function serializeStore(state: State): ?ExportType {
-  const state = data.getState();
   const {activeNotifications} = state.notifications;
   const {selectedDevice, clients} = state.connections;
   const {pluginStates} = state;
   const {devicePlugins} = state.plugins;
   // TODO: T39612653 Make Client mockable. Currently rsocket logic is tightly coupled.
   // Not passing the entire state as currently Client is not mockable.
-  const json = processStore(
+  return processStore(
     activeNotifications,
     selectedDevice,
     pluginStates,
     clients.map(client => client.toJSON()),
     devicePlugins,
   );
+}
+
+export const exportStoreToFile = (store: Store): Promise<void> => {
+  const json = serializeStore(store.getState());
   if (json) {
     return new Promise((resolve, reject) => {
       fs.writeFile(exportFilePath, JSON.stringify(json), err => {