State Management

Overview

SubWallet employs a multi-layer state management architecture:

Chrome Storage Stores - Persistent storage for background service
Redux Store - Client-side state management in UI
Service State - In-memory state in background services
Subscriptions - Real-time state synchronization

Architecture

Background Service
├── Chrome Storage (BaseStore/SubscribableStore)
│   ├── AccountsStore
│   ├── KeyringStore
│   ├── SettingsStore
│   └── ...
└── Service State (in-memory)
    ├── BalanceService
    ├── ChainService
    └── ...
         |
         | Subscriptions
         v
Extension UI
└── Redux Store
    ├── accountState
    ├── chainStore
    ├── balance
    └── ...

Chrome Storage Stores

BaseStore

The foundation for all persistent storage in the background. Location: packages/extension-base/src/stores/Base.ts

export default abstract class BaseStore<T> {
  #prefix: string;

  constructor(prefix: string | null) {
    this.#prefix = prefix ? `${prefix}:` : '';
  }

  public getPrefix(): string {
    return this.#prefix;
  }

  // Get all items
  public all(update: (key: string, value: T) => void): void {
    this.allMap((map): void => {
      Object.entries(map).forEach(([key, value]): void => {
        update(key, value);
      });
    });
  }

  // Get all items as map
  public allMap(update: (value: Record<string, T>) => void): void {
    chrome.storage.local.get(null, (result: StoreValue): void => {
      const entries = Object.entries(result);
      const map: Record<string, T> = {};

      for (let i = 0; i < entries.length; i++) {
        const [key, value] = entries[i];
        if (key.startsWith(this.#prefix)) {
          map[key.replace(this.#prefix, '')] = value as T;
        }
      }

      update(map);
    });
  }

  // Get single item
  public get(_key: string, update: (value: T) => void): void {
    const key = `${this.#prefix}${_key}`;
    chrome.storage.local.get([key], (result: StoreValue): void => {
      update(result[key] as T);
    });
  }

  // Set item
  public set(_key: string, value: T, update?: () => void): void {
    const key = `${this.#prefix}${_key}`;
    chrome.storage.local.set({ [key]: value }, (): void => {
      update && update();
    });
  }

  // Remove item
  public remove(_key: string, update?: () => void): void {
    const key = `${this.#prefix}${_key}`;
    chrome.storage.local.remove(key, (): void => {
      update && update();
    });
  }
}

Source: packages/extension-base/src/stores/Base.ts:14-81 Key Features:

Namespaced keys with prefix
Async callback-based API
Chrome storage.local backend
Type-safe value storage

SubscribableStore

Extends BaseStore with RxJS subscription support. Location: packages/extension-base/src/stores/SubscribableStore.ts

import BaseStore from '@subwallet/extension-base/stores/Base';
import { Subject } from 'rxjs';

export default abstract class SubscribableStore<T> extends BaseStore<T> {
  private readonly subject: Subject<T> = new Subject<T>();

  public getSubject(): Subject<T> {
    return this.subject;
  }

  public override set(_key: string, value: T, update?: () => void): void {
    super.set(_key, value, () => {
      this.subject.next(value);  // Emit update
      update && update();
    });
  }

  public asyncGet = async (key: string): Promise<T> => {
    return new Promise((resolve) => {
      this.get(key, resolve);
    });
  };

  public removeAll() {
    return this.all((key) => this.remove(key));
  }
}

Source: packages/extension-base/src/stores/SubscribableStore.ts:7-30 Key Features:

RxJS Subject for reactive updates
Emits on every set() call
Promise-based asyncGet() helper
Batch removal support

Built-in Stores

Location: packages/extension-base/src/stores/

// Account management
export class AccountsStore extends BaseStore<KeyringJson> {
  constructor() {
    super(EXTENSION_PREFIX ? `${EXTENSION_PREFIX}accounts` : null);
  }

  public override set(key: string, value: KeyringJson, update?: () => void): void {
    // Skip testing accounts
    if (key.startsWith('account:') && value.meta && value.meta.isTesting) {
      update && update();
      return;
    }
    super.set(key, value, update);
  }
}

// Keyring passwords
export class KeyringStore extends BaseStore<string> {
  constructor() {
    super(EXTENSION_PREFIX ? `${EXTENSION_PREFIX}keyring` : null);
  }
}

// Current account
export class CurrentAccountStore extends SubscribableStore<CurrentAccountInfo> {
  constructor() {
    super('current-account');
  }
}

// Settings
export class SettingsStore extends SubscribableStore<UiSettings> {
  constructor() {
    super('settings');
  }
}

// Chain metadata
export class MetadataStore extends BaseStore<MetadataDef> {
  constructor() {
    super(EXTENSION_PREFIX ? `${EXTENSION_PREFIX}metadata` : null);
  }
}

// Authorization
export class AuthorizeStore extends BaseStore<AuthUrls> {
  constructor() {
    super(EXTENSION_PREFIX ? `${EXTENSION_PREFIX}auth` : null);
  }
}

Source: packages/extension-base/src/stores/Accounts.ts:9-24

Redux Store (UI)

Store Configuration

Location: packages/extension-koni-ui/src/stores/index.ts

import { combineReducers, configureStore } from '@reduxjs/toolkit';
import { persistReducer, persistStore } from 'redux-persist';
import storage from 'redux-persist/lib/storage';

const persistConfig = {
  key: 'root',
  version: 1,
  storage: storage,
  whitelist: [
    'settings',
    'uiViewState',
    'staking',
    'campaign',
    'buyService',
    'staticContent',
    'price',
    'earning'
  ]
};

const rootReducers = combineReducers({
  // Feature stores
  transactionHistory: TransactionHistoryReducer,
  crowdloan: CrowdloanReducer,
  nft: NftReducer,
  staking: StakingReducer,
  price: PriceReducer,
  balance: BalanceReducer,
  bonding: BondingReducer,
  mantaPay: MantaPayReducer,
  campaign: CampaignReducer,
  buyService: BuyServiceReducer,
  earning: EarningReducer,
  swap: SwapReducer,
  
  // Common stores
  chainStore: ChainStoreReducer,
  assetRegistry: AssetRegistryReducer,
  
  // Base stores
  requestState: RequestStateReducer,
  settings: SettingsReducer,
  accountState: AccountStateReducer,
  uiViewState: UIViewStateReducer,
  staticContent: StaticContentReducer,
  
  // Other stores
  walletConnect: WalletConnectReducer,
  missionPool: MissionPoolReducer,
  notification: NotificationReducer,
  openGov: GovernanceReducer,
  multisig: MultisigReducer
});

const persistedReducer = persistReducer(persistConfig, rootReducers);

export const store = configureStore({
  devTools: process.env.NODE_ENV !== 'production',
  reducer: persistedReducer,
  middleware: (getDefaultMiddleware) =>
    getDefaultMiddleware({
      serializableCheck: {
        ignoredActions: [FLUSH, REHYDRATE, PAUSE, PERSIST, PURGE, REGISTER]
      }
    })
});

export const persistor = persistStore(store);

export type RootState = ReturnType<typeof store.getState>;
export type StoreName = keyof RootState;
export type AppStore = typeof store;
export type AppDispatch = typeof store.dispatch;

Source: packages/extension-koni-ui/src/stores/index.ts:4-110

Store Categories

Base Stores

accountState: Account list, current account settings: UI settings, theme, language requestState: Authorization, signing requests uiViewState: UI state, modals, navigation staticContent: Static content, campaigns

Feature Stores

balance: Account balances price: Token prices transactionHistory: Transaction history staking: Staking positions earning: Yield positions nft: NFT collections and items swap: Swap pairs and quotes crowdloan: Crowdloan contributions

Common Stores

chainStore: Chain info, metadata, state assetRegistry: Token/asset registry

Redux Toolkit Slices

Example slice structure:

import { createSlice, PayloadAction } from '@reduxjs/toolkit';

interface AccountState {
  accounts: AccountJson[];
  currentAccount: AccountJson | null;
  isReady: boolean;
}

const initialState: AccountState = {
  accounts: [],
  currentAccount: null,
  isReady: false
};

const accountSlice = createSlice({
  name: 'accountState',
  initialState,
  reducers: {
    updateAccounts: (state, action: PayloadAction<AccountJson[]>) => {
      state.accounts = action.payload;
      state.isReady = true;
    },
    setCurrentAccount: (state, action: PayloadAction<AccountJson | null>) => {
      state.currentAccount = action.payload;
    },
    reset: (state) => {
      state.accounts = [];
      state.currentAccount = null;
      state.isReady = false;
    }
  }
});

export const { updateAccounts, setCurrentAccount, reset } = accountSlice.actions;
export default accountSlice.reducer;

State Synchronization

Background to UI Subscriptions

Location: packages/extension-koni-ui/src/stores/utils.ts

// Subscribe to account updates
export function subscribeAccountsData() {
  return lazySubscribeMessage(
    'pri(accounts.subscribe)',
    null,
    (data) => {
      store.dispatch(updateAccounts(data));
    },
    (data) => {
      store.dispatch(updateAccounts(data));
    }
  );
}

// Subscribe to balance updates
export function subscribeBalance() {
  return lazySubscribeMessage(
    'pri(balance.subscribe)',
    null,
    (data) => {
      store.dispatch(updateBalance(data));
    },
    (data) => {
      store.dispatch(updateBalance(data));
    }
  );
}

// Subscribe to chain info
export function subscribeChainInfoMap() {
  return lazySubscribeMessage(
    'pri(chainService.subscribeChainInfoMap)',
    null,
    (data) => {
      store.dispatch(updateChainInfoMap(data));
    },
    (data) => {
      store.dispatch(updateChainInfoMap(data));
    }
  );
}

DataContext Integration

Location: packages/extension-koni-ui/src/contexts/DataContext.tsx

export interface DataHandler {
  name: string;
  unsub?: () => void;
  isSubscription?: boolean;
  start: () => void;
  isStarted?: boolean;
  isStartImmediately?: boolean;
  promise?: Promise<any>;
  relatedStores: StoreName[];
}

const DataContext: DataContextType = {
  handlerMap: {},
  storeDependencies: {},
  
  addHandler: function(item: DataHandler) {
    const { name } = item;
    item.isSubscription = !!item.unsub;
    
    if (!this.handlerMap[name]) {
      this.handlerMap[name] = item;
      
      // Track dependencies
      item.relatedStores.forEach((storeName) => {
        if (!this.storeDependencies[storeName]) {
          this.storeDependencies[storeName] = [];
        }
        this.storeDependencies[storeName]?.push(name);
      });
      
      // Auto-start if configured
      if (item.isStartImmediately) {
        item.start();
        item.isStarted = true;
      }
    }
    
    return () => this.removeHandler(name);
  },
  
  awaitStores: async function(storeNames: StoreName[]): Promise<boolean> {
    // Wait for all required handlers to complete
    const handlers = storeNames.flatMap(
      (storeName) => this.storeDependencies[storeName] || []
    );
    
    const promises = handlers.map((name) => {
      const handler = this.handlerMap[name];
      if (!handler.isStarted) {
        handler.start();
        handler.isStarted = true;
      }
      return handler.promise;
    });
    
    await Promise.all(promises);
    return true;
  }
};

Source: packages/extension-koni-ui/src/contexts/DataContext.tsx:41-103

Common Patterns

Reading from Chrome Storage

// Callback-based
const accountStore = new AccountsStore();
accountStore.get('account:0x123', (account) => {
  console.log(account);
});

// Promise-based (with SubscribableStore)
const settingsStore = new SettingsStore();
const settings = await settingsStore.asyncGet('default');

Writing to Chrome Storage

const accountStore = new AccountsStore();
accountStore.set('account:0x123', accountData, () => {
  console.log('Account saved');
});

Subscribing to Changes

const currentAccountStore = new CurrentAccountStore();
const subject = currentAccountStore.getSubject();

const subscription = subject.subscribe((account) => {
  console.log('Account changed:', account);
});

// Later
subscription.unsubscribe();

Using Redux Store in Components

import { useSelector, useDispatch } from 'react-redux';
import { RootState } from '@subwallet/extension-koni-ui/stores';

function MyComponent() {
  const dispatch = useDispatch();
  
  // Select state
  const accounts = useSelector((state: RootState) => state.accountState.accounts);
  const balance = useSelector((state: RootState) => state.balance);
  
  // Dispatch actions
  const handleUpdate = () => {
    dispatch(updateAccounts(newAccounts));
  };
  
  return <div>{accounts.length} accounts</div>;
}

Awaiting Store Data

import { useContext, useEffect, useState } from 'react';
import { DataContext } from '@subwallet/extension-koni-ui/contexts/DataContext';

function MyComponent() {
  const { awaitStores } = useContext(DataContext);
  const [isReady, setIsReady] = useState(false);
  
  useEffect(() => {
    awaitStores(['accountState', 'chainStore', 'balance'])
      .then(() => setIsReady(true));
  }, []);
  
  if (!isReady) {
    return <LoadingScreen />;
  }
  
  return <MyContent />;
}

State Persistence

Chrome Storage (Background)

Persistent:

Survives extension restart
Survives browser restart
Shared across all extension contexts
Quota: ~5MB (local storage)

Use Cases:

Account data
Keyring
Settings
Authorization data
Metadata

Redux Persist (UI)

Persistent (via localStorage):

Survives page refresh
Lost on extension update (sometimes)
Separate per popup instance

Persisted Stores:

whitelist: [
  'settings',      // UI preferences
  'uiViewState',   // UI state
  'staking',       // Staking preferences
  'campaign',      // Campaign state
  'buyService',    // Buy service state
  'staticContent', // Static content
  'price',         // Price cache
  'earning'        // Earning preferences
]

Not Persisted (ephemeral):

Balance (refreshed on load)
Transaction history (subscribed)
NFTs (subscribed)
Chain state (subscribed)
Request state (ephemeral)

Best Practices

Use Appropriate Storage:
- Chrome Storage for critical data in background
- Redux for UI state
- Don’t duplicate data unnecessarily
Subscribe to Updates:
- Use SubscribableStore for reactive data
- Set up subscriptions in DataContext
- Clean up subscriptions on unmount
Await Store Readiness:
- Use awaitStores() before rendering
- Show loading states while waiting
- Handle loading errors gracefully
Type Safety:
- Define TypeScript types for all state
- Use RootState type for selectors
- Use PayloadAction for Redux actions
Performance:
- Don’t persist large datasets
- Use memoization for expensive selectors
- Batch updates when possible
Error Handling:
- Handle Chrome storage errors
- Validate data on read
- Provide fallbacks for missing data

Background Services - Service architecture
Extension UI - Redux integration
Message Passing - State synchronization

Getting Started

Architecture

Package Structure

Development

Core Concepts

Contributing

Overview

Architecture

Chrome Storage Stores

BaseStore

SubscribableStore

Built-in Stores

Redux Store (UI)

Store Configuration

Store Categories

Base Stores

Feature Stores

Common Stores

Redux Toolkit Slices

State Synchronization

Background to UI Subscriptions

DataContext Integration

Common Patterns

Reading from Chrome Storage

Writing to Chrome Storage

Subscribing to Changes

Using Redux Store in Components

Awaiting Store Data

State Persistence

Chrome Storage (Background)

Redux Persist (UI)

Best Practices

Build docs developers (and LLMs) love

Getting Started

Architecture

Package Structure

Development

Core Concepts

Contributing

Documentation Index

​Overview

​Architecture

​Chrome Storage Stores

​BaseStore

​SubscribableStore

​Built-in Stores

​Redux Store (UI)

​Store Configuration

​Store Categories

​Base Stores

​Feature Stores

​Common Stores

​Redux Toolkit Slices

​State Synchronization

​Background to UI Subscriptions

​DataContext Integration

​Common Patterns

​Reading from Chrome Storage

​Writing to Chrome Storage

​Subscribing to Changes

​Using Redux Store in Components

​Awaiting Store Data

​State Persistence

​Chrome Storage (Background)

​Redux Persist (UI)

​Best Practices

​Related Documentation

Build docs developers (and LLMs) love

Overview

Architecture

Chrome Storage Stores

BaseStore

SubscribableStore

Built-in Stores

Redux Store (UI)

Store Configuration

Store Categories

Base Stores

Feature Stores

Common Stores

Redux Toolkit Slices

State Synchronization

Background to UI Subscriptions

DataContext Integration

Common Patterns

Reading from Chrome Storage

Writing to Chrome Storage

Subscribing to Changes

Using Redux Store in Components

Awaiting Store Data

State Persistence

Chrome Storage (Background)

Redux Persist (UI)

Best Practices

Related Documentation