Simplify the fetch credentials structure to not use the fetch record.

It was thrashing the redux store. We made the same change for the ios app.

src/App.tsx

@@ -3,7 +3,6 @@ import { List as ImmutableList } from 'immutable';
 import { connect } from 'react-redux';
 import { withRouter } from 'react-router';
 import { BrowserRouter } from 'react-router-dom';
-import { createSelector } from 'reselect';
 import { MuiThemeProvider as ThemeProvider, createMuiTheme } from '@material-ui/core/styles'; // v1.x
 import amber from '@material-ui/core/colors/amber';
 import lightBlue from '@material-ui/core/colors/lightBlue';
@@ -32,6 +31,8 @@ import { RouteResolver } from './routes';
 import * as store from './store';
 import * as actions from './store/actions';
 
+import { credentialsSelector } from './login';
+
 import { History } from 'history';
 
 const muiTheme = createMuiTheme({
@@ -170,7 +171,7 @@ class App extends React.PureComponent {
   };
 
   public props: {
-    credentials: store.CredentialsType;
+    credentials: store.CredentialsData;
     entries: store.EntriesType;
     fetchCount: number;
     errors: ImmutableList<Error>;
@@ -186,7 +187,7 @@ class App extends React.PureComponent {
   }
 
   public render() {
-    const credentials = (this.props.credentials) ? this.props.credentials.value : null;
+    const credentials = this.props.credentials ?? null;
 
     const errors = this.props.errors;
     const fetching = this.props.fetchCount > 0;
@@ -251,7 +252,7 @@ class App extends React.PureComponent {
             </Drawer>
 
             <ErrorBoundary>
-              <LoginGate credentials={this.props.credentials} />
+              <LoginGate />
             </ErrorBoundary>
           </div>
         </BrowserRouter>
@@ -268,31 +269,10 @@ class App extends React.PureComponent {
   }
 
   private refresh() {
-    store.store.dispatch<any>(actions.fetchAll(this.props.credentials.value!, this.props.entries));
+    store.store.dispatch<any>(actions.fetchAll(this.props.credentials, this.props.entries));
   }
 }
 
-const credentialsSelector = createSelector(
-  (state: store.StoreState) => state.credentials.value,
-  (state: store.StoreState) => state.credentials.error,
-  (state: store.StoreState) => state.credentials.fetching,
-  (state: store.StoreState) => state.encryptionKey.key,
-  (value, error, fetching, encryptionKey) => {
-    if (value === null) {
-      return { value, error, fetching };
-    }
-
-    return {
-      error,
-      fetching,
-      value: {
-        ...value,
-        encryptionKey,
-      },
-    };
-  }
-);
-
 const mapStateToProps = (state: store.StoreState) => {
   return {
     credentials: credentialsSelector(state),

src/LoginGate.tsx

@@ -8,7 +8,7 @@ import SyncGate from './SyncGate';
 import LoginForm from './components/LoginForm';
 import EncryptionLoginForm from './components/EncryptionLoginForm';
 
-import { store, CredentialsType } from './store';
+import { store, StoreState, CredentialsDataRemote } from './store';
 import { deriveKey, fetchCredentials, fetchUserInfo } from './store/actions';
 
 import * as EteSync from 'etesync';
@@ -16,14 +16,16 @@ import * as C from './constants';
 
 import SignedPagesBadge from './images/signed-pages-badge.svg';
 import LoadingIndicator from './widgets/LoadingIndicator';
+import { useCredentials, useRemoteCredentials } from './login';
+import { useSelector } from 'react-redux';
 
 
-function EncryptionPart(props: { credentials: CredentialsType }) {
+function EncryptionPart(props: { credentials: CredentialsDataRemote }) {
   const [fetched, setFetched] = React.useState(false);
   const [userInfo, setUserInfo] = React.useState<EteSync.UserInfo>();
   const [error, setError] = React.useState<Error>();
 
-  const credentials = props.credentials.value!;
+  const credentials = props.credentials;
 
   React.useEffect(() => {
     // FIXME: verify the error is a 404
@@ -41,7 +43,7 @@ function EncryptionPart(props: { credentials: CredentialsType }) {
   }
 
   function onEncryptionFormSubmit(encryptionPassword: string) {
-    const derivedAction = deriveKey(props.credentials.value!.credentials.email, encryptionPassword);
+    const derivedAction = deriveKey(credentials.credentials.email, encryptionPassword);
     if (userInfo) {
       const userInfoCryptoManager = userInfo.getCryptoManager(derivedAction.payload!);
       try {
@@ -81,18 +83,25 @@ function EncryptionPart(props: { credentials: CredentialsType }) {
   );
 }
 
-interface PropsType {
-  credentials: CredentialsType;
-}
-
-export default function LoginGate(props: PropsType) {
+export default function LoginGate() {
+  const remoteCredentials = useRemoteCredentials();
+  const credentials = useCredentials();
+  const fetchCount = useSelector((state: StoreState) => state.fetchCount);
+  const [fetchError, setFetchError] = React.useState<Error>();
 
-  function onFormSubmit(username: string, password: string, serviceApiUrl?: string) {
+  async function onFormSubmit(username: string, password: string, serviceApiUrl?: string) {
     serviceApiUrl = serviceApiUrl ? serviceApiUrl : C.serviceApiBase;
-    store.dispatch<any>(fetchCredentials(username, password, serviceApiUrl));
+    try {
+      setFetchError(undefined);
+      const ret = fetchCredentials(username, password, serviceApiUrl);
+      await ret.payload;
+      store.dispatch(ret);
+    } catch (e) {
+      setFetchError(e);
+    }
   }
 
-  if (props.credentials.value === null) {
+  if (remoteCredentials === null) {
     const style = {
       isSafe: {
         textDecoration: 'none',
@@ -109,8 +118,8 @@ export default function LoginGate(props: PropsType) {
         <h2>Please Log In</h2>
         <LoginForm
           onSubmit={onFormSubmit}
-          error={props.credentials.error}
-          loading={props.credentials.fetching}
+          error={fetchError}
+          loading={fetchCount > 0}
         />
         <hr style={style.divider} />
         <ExternalLink style={style.isSafe} href="https://www.etesync.com/faq/#signed-pages">
@@ -127,13 +136,13 @@ export default function LoginGate(props: PropsType) {
         </ul>
       </Container>
     );
-  } else if (props.credentials.value.encryptionKey === null) {
+  } else if (credentials === null) {
     return (
-      <EncryptionPart credentials={props.credentials} />
+      <EncryptionPart credentials={remoteCredentials} />
     );
   }
 
   return (
-    <SyncGate etesync={props.credentials.value} />
+    <SyncGate etesync={credentials} />
   );
 }

src/login/index.tsx

@@ -0,0 +1,44 @@
+import { shallowEqual, useSelector } from 'react-redux';
+import { createSelector } from 'reselect';
+
+import * as store from '../store';
+
+export const remoteCredentialsSelector = createSelector(
+  (state: store.StoreState) => state.credentials.credentials,
+  (state: store.StoreState) => state.credentials.serviceApiUrl,
+  (credentials, serviceApiUrl) => {
+    if (!credentials) {
+      return null;
+    }
+
+    const ret: store.CredentialsDataRemote = {
+      credentials,
+      serviceApiUrl,
+    };
+    return ret;
+  }
+);
+
+export function useRemoteCredentials() {
+  return useSelector(remoteCredentialsSelector, shallowEqual);
+}
+
+export const credentialsSelector = createSelector(
+  (state: store.StoreState) => remoteCredentialsSelector(state),
+  (state: store.StoreState) => state.encryptionKey.key,
+  (remoteCredentials, encryptionKey) => {
+    if (!remoteCredentials || !encryptionKey) {
+      return null;
+    }
+
+    const ret: store.CredentialsData = {
+      ...remoteCredentials,
+      encryptionKey,
+    };
+    return ret;
+  }
+);
+
+export function useCredentials() {
+  return useSelector(credentialsSelector, shallowEqual);
+}

src/store/construct.ts

@@ -8,13 +8,13 @@ import { List, Map as ImmutableMap } from 'immutable';
 import * as EteSync from 'etesync';
 import {
   JournalsData, FetchType, EntriesData, EntriesFetchRecord, UserInfoData, JournalsFetchRecord, UserInfoFetchRecord,
-  CredentialsTypeRemote, JournalsType, EntriesType, UserInfoType, SettingsType,
+  CredentialsDataRemote, JournalsType, EntriesType, UserInfoType, SettingsType,
   fetchCount, journals, entries, credentials, userInfo, settingsReducer, encryptionKeyReducer, errorsReducer,
 } from './reducers';
 
 export interface StoreState {
   fetchCount: number;
-  credentials: CredentialsTypeRemote;
+  credentials: CredentialsDataRemote;
   settings: SettingsType;
   encryptionKey: {key: string};
   cache: {

src/store/reducers.ts

@@ -34,9 +34,6 @@ interface BaseModel {
   uid: string;
 }
 
-export type CredentialsType = FetchType<CredentialsData>;
-export type CredentialsTypeRemote = FetchType<CredentialsDataRemote>;
-
 export type JournalsData = ImmutableMap<string, EteSync.Journal>;
 export const JournalsFetchRecord = fetchTypeRecord<JournalsData>();
 export type JournalsType = FetchType<JournalsData>;
@@ -97,32 +94,24 @@ export const encryptionKeyReducer = handleActions(
 export const credentials = handleActions(
   {
     [actions.fetchCredentials.toString()]: (
-      _state: CredentialsTypeRemote, action: any) => {
+      state: CredentialsDataRemote, action: any) => {
       if (action.error) {
-        return {
-          value: null,
-          error: action.payload,
-        };
+        return state;
       } else if (action.payload === undefined) {
-        return {
-          fetching: true,
-          value: null,
-        };
+        return state;
       } else {
         const {
           encryptionKey, // We don't want to set encryption key here.
           ...payload
         } = action.payload;
-        return {
-          value: payload,
-        };
+        return payload;
       }
     },
-    [actions.logout.toString()]: (_state: CredentialsTypeRemote, _action: any) => {
-      return { out: true, value: null };
+    [actions.logout.toString()]: (_state: CredentialsDataRemote, _action: any) => {
+      return {};
     },
   },
-  { value: null }
+  {} as CredentialsDataRemote
 );
 
 const setMapModelReducer = <T extends Record<any>, V extends BaseModel>(state: T, action: any) => {