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diff --git a/lib/components/ens-cache-provider.react.js b/lib/components/ens-cache-provider.react.js
--- a/lib/components/ens-cache-provider.react.js
+++ b/lib/components/ens-cache-provider.react.js
@@ -3,14 +3,21 @@
import * as React from 'react';
import { ENSCache, type EthersProvider } from '../utils/ens-cache';
+import {
+ getENSNames as baseGetENSNames,
+ type GetENSNames,
+} from '../utils/ens-helpers';
type ENSCacheContextType = {
+ensCache: ?ENSCache,
+ +getENSNames: ?GetENSNames,
+};
+const defaultContext = {
+ ensCache: undefined,
+ getENSNames: undefined,
};
const ENSCacheContext: React.Context<ENSCacheContextType> = React.createContext<ENSCacheContextType>(
- {
- ensCache: undefined,
- },
+ defaultContext,
);
type Props = {
@@ -19,12 +26,14 @@
};
function ENSCacheProvider(props: Props): React.Node {
const { provider, children } = props;
- const context = React.useMemo(
- () => ({
- ensCache: provider ? new ENSCache(provider) : null,
- }),
- [provider],
- );
+ const context = React.useMemo(() => {
+ if (!provider) {
+ return defaultContext;
+ }
+ const ensCache = new ENSCache(provider);
+ const getENSNames: GetENSNames = baseGetENSNames.bind(null, ensCache);
+ return { ensCache, getENSNames };
+ }, [provider]);
return (
<ENSCacheContext.Provider value={context}>
{children}
diff --git a/lib/utils/ens-helpers.js b/lib/utils/ens-helpers.js
new file mode 100644
--- /dev/null
+++ b/lib/utils/ens-helpers.js
@@ -0,0 +1,75 @@
+// @flow
+
+import { userIdentifiedByETHAddress } from '../shared/account-utils';
+import { ENSCache } from './ens-cache';
+
+type BaseUserInfo = { +username?: ?string, ... };
+export type GetENSNames = <T: ?BaseUserInfo>(
+ users: $ReadOnlyArray<T>,
+) => Promise<T[]>;
+
+async function getENSNames<T: ?BaseUserInfo>(
+ ensCache: ENSCache,
+ users: $ReadOnlyArray<T>,
+): Promise<T[]> {
+ const info = users.map(user => {
+ if (!user) {
+ return user;
+ }
+ const { username } = user;
+ const ethAddress =
+ username && userIdentifiedByETHAddress(user) ? username : null;
+ const cachedResult = ethAddress
+ ? ensCache.getCachedNameForAddress(ethAddress)
+ : null;
+ return {
+ input: user,
+ ethAddress,
+ cachedResult,
+ };
+ });
+
+ const needFetch = info
+ .map(user => {
+ if (!user) {
+ return null;
+ }
+ const { ethAddress, cachedResult } = user;
+ if (cachedResult || !ethAddress) {
+ return null;
+ }
+ return ethAddress;
+ })
+ .filter(Boolean);
+
+ const ensNames = new Map();
+ if (needFetch.length > 0) {
+ await Promise.all(
+ needFetch.map(async (ethAddress: string) => {
+ const ensName = await ensCache.getNameForAddress(ethAddress);
+ if (ensName) {
+ ensNames.set(ethAddress, ensName);
+ }
+ }),
+ );
+ }
+
+ return info.map(user => {
+ if (!user) {
+ return user;
+ }
+ const { input, ethAddress, cachedResult } = user;
+ if (cachedResult) {
+ return { ...input, username: cachedResult };
+ } else if (!ethAddress) {
+ return input;
+ }
+ const ensName = ensNames.get(ethAddress);
+ if (ensName) {
+ return { ...input, username: ensName };
+ }
+ return input;
+ });
+}
+
+export { getENSNames };

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