feat: add wallet rpc examples

packages/example-react-app/src/App.tsx

@@ -1,12 +1,12 @@
 import { useContext, useEffect, useState } from 'react';
 import type { ProviderChainId, providers } from 'web3';
 
+import { Accounts } from './components/Accounts';
+import { ProviderButton } from './components/ProviderButton';
+import { SwitchEthereumChain } from './wallet-components/SwitchEthereumChain';
 import { AccountProvider } from './web3/AccountContext';
 import { type IWeb3Context, Web3Context } from './web3/Web3Context';
-
-import Accounts from './Accounts';
-import ProviderButton from './ProviderButton';
-import WalletRpcPlugComponent from './WalletRpcPlugComponent';
+import { AddEthereumChain } from './wallet-components/AddEthereumChain';
 
 function App() {
   const web3Context: IWeb3Context = useContext(Web3Context);
@@ -74,14 +74,20 @@ function App() {
               })}
             </>
           ) : null}
+
           <h2>Network Details</h2>
           <div>Chain ID: {`${chainId}`}</div>
           <div>Network ID: {`${networkId}`}</div>
+
           <AccountProvider>
-            <Accounts></Accounts>
+            <Accounts />
           </AccountProvider>
 
-          <WalletRpcPlugComponent></WalletRpcPlugComponent>
+          <h2>Wallet RPC Methods</h2>
+          <div>
+            <AddEthereumChain />
+            <SwitchEthereumChain />
+          </div>
         </>
       )}
       <br />

packages/example-react-app/src/components/AccountDetail.tsx

@@ -0,0 +1,44 @@
+import { type MutableRefObject, useContext, useEffect, useRef, useState } from 'react';
+
+import { type IWeb3Context, Web3Context } from '../web3/Web3Context';
+
+export function AccountDetail({ address }: { address: string }) {
+  const web3Context: IWeb3Context = useContext(Web3Context);
+
+  const [balance, setBalance] = useState<number>(NaN);
+  const subscriptionId: MutableRefObject<string | undefined> = useRef(undefined);
+
+  async function updateBalance(): Promise<void> {
+    const newBalance = await web3Context.web3.eth.getBalance(address);
+
+    setBalance(parseFloat(web3Context.web3.utils.fromWei(newBalance, 'ether')));
+  }
+
+  useEffect(() => {
+    async function subscribeToNewBlockHeaders() {
+      const newBlockSubscription =
+        await web3Context.web3.eth.subscribe('newBlockHeaders');
+
+      subscriptionId.current = newBlockSubscription.id;
+
+      newBlockSubscription.on('data', () => {
+        void updateBalance();
+      });
+    }
+
+    void subscribeToNewBlockHeaders();
+
+    return () => {
+      void web3Context.web3.eth.subscriptionManager.unsubscribe(
+        ({ id }) => subscriptionId.current === id,
+      );
+    };
+  });
+
+  return (
+    <>
+      <div>{address}</div>
+      <div>Balance in native token: {`${balance}`}</div>
+    </>
+  );
+}

packages/example-react-app/src/Accounts.tsx → packages/example-react-app/src/components/Accounts.tsx

@@ -1,25 +1,29 @@
 import { useContext } from 'react';
-import { AccountContext, type IAccountContext } from './web3/AccountContext';
-import AccountDetail from './AccountDetail';
 
-function Accounts() {
+import { AccountContext, type IAccountContext } from '../web3/AccountContext';
+
+import { AccountDetail } from './AccountDetail';
+
+export function Accounts() {
   const accountContext: IAccountContext = useContext(AccountContext);
 
   return (
     <>
       <h2>Accounts</h2>
       <div>
         {accountContext.selectedAccount === undefined ? (
-          <button onClick={accountContext.requestAccounts}>Connect Accounts</button>
+          <button type="button" onClick={accountContext.requestAccounts}>
+            Connect Accounts
+          </button>
         ) : (
           <>
             <h3>Selected Account</h3>
-            <AccountDetail address={accountContext.selectedAccount}></AccountDetail>
+            <AccountDetail address={accountContext.selectedAccount} />
             {accountContext.accounts.length > 1 ? (
               <>
                 <h3>Other Accounts</h3>
                 {accountContext.accounts.slice(1).map((account: string) => (
-                  <AccountDetail address={account} key={account}></AccountDetail>
+                  <AccountDetail address={account} key={account} />
                 ))}
               </>
             ) : null}
@@ -29,5 +33,3 @@ function Accounts() {
     </>
   );
 }
-
-export default Accounts;

packages/example-react-app/src/components/ProviderButton.tsx

@@ -0,0 +1,18 @@
+import { useContext } from 'react';
+import type { EIP6963ProviderDetail } from 'web3';
+
+import type { IWeb3Context } from '../web3/Web3Context';
+import { Web3Context } from '../web3/Web3Context';
+
+import './ProviderButton.css';
+
+export function ProviderButton({ provider }: { provider: EIP6963ProviderDetail }) {
+  const web3Context: IWeb3Context = useContext(Web3Context);
+
+  return (
+    <button type="button" onClick={() => web3Context.setCurrentProvider(provider)}>
+      <img src={provider.info.icon} alt={provider.info.name} width="35" />
+      <span> {provider.info.name}</span>
+    </button>
+  );
+}

packages/example-react-app/src/wallet-components/AddEthereumChain.tsx

@@ -0,0 +1,74 @@
+import { AddEthereumChainRequest } from 'web3-plugin-wallet-rpc';
+import { Web3Context } from '../web3/Web3Context';
+import { useContext, useState } from 'react';
+
+const chains: Record<string, AddEthereumChainRequest> = {
+  mantle: {
+    chainId: 5000,
+    blockExplorerUrls: ['https://mantlescan.xyz'],
+    chainName: 'Mantle',
+    iconUrls: ['https://icons.llamao.fi/icons/chains/rsz_mantle.jpg'],
+    nativeCurrency: {
+      name: 'Mantle',
+      symbol: 'MNT',
+      decimals: 18,
+    },
+    rpcUrls: ['https://rpc.mantle.xyz'],
+  },
+  scroll: {
+    chainId: 534352,
+    blockExplorerUrls: ['https://scrollscan.com'],
+    chainName: 'Scroll',
+    iconUrls: ['https://icons.llamao.fi/icons/chains/rsz_scroll.jpg'],
+    nativeCurrency: {
+      name: 'ETH',
+      symbol: 'ETH',
+      decimals: 18,
+    },
+    rpcUrls: ['https://rpc.scroll.io'],
+  },
+};
+
+function AddChainButton({ chainDetails }: { chainDetails: AddEthereumChainRequest }) {
+  const { web3 } = useContext(Web3Context);
+  const [error, setError] = useState<Error | undefined>(undefined);
+
+  const handleClick = () => {
+    web3.walletRpc
+      .addEthereumChain(chainDetails)
+      .then((response) => {
+        // eslint-disable-next-line no-console
+        console.log(
+          `Successfully added chain ${chainDetails.chainId} with response`,
+          response,
+        );
+      })
+      .catch((e) => {
+        // eslint-disable-next-line no-console
+        console.error(e);
+
+        if (e instanceof Error) {
+          setError(e);
+        }
+      });
+  };
+
+  return (
+    <>
+      <button type="button" onClick={handleClick}>
+        {`Add new chain: ${chainDetails.chainName} (${chainDetails.chainId})`}
+      </button>
+      {error && <div>{error.message}</div>}
+    </>
+  );
+}
+
+export function AddEthereumChain() {
+  return (
+    <div>
+      <h4>Add EVM Chain</h4>
+      <AddChainButton chainDetails={chains.mantle} />
+      <AddChainButton chainDetails={chains.scroll} />
+    </div>
+  );
+}

packages/example-react-app/src/wallet-components/SwitchEthereumChain.tsx

@@ -0,0 +1,45 @@
+import { useContext, useState } from 'react';
+
+import { Web3Context } from '../web3/Web3Context';
+
+function SwitchChainButton({ chainId }: { chainId: number }) {
+  const { web3 } = useContext(Web3Context);
+  const [error, setError] = useState<Error | undefined>(undefined);
+
+  const handleClick = () => {
+    web3.walletRpc
+      .switchEthereumChain(chainId)
+      .then((response) => {
+        // eslint-disable-next-line no-console
+        console.log(`Successfully switched to chain ${chainId} with response`, response);
+      })
+      .catch((e) => {
+        // eslint-disable-next-line no-console
+        console.error(e);
+
+        if (e instanceof Error) {
+          setError(e);
+        }
+      });
+  };
+
+  return (
+    <>
+      <button type="button" onClick={handleClick}>
+        Switch to chain {chainId}
+      </button>
+      {error && <div>{error.message}</div>}
+    </>
+  );
+}
+
+export function SwitchEthereumChain() {
+  return (
+    <div>
+      <h4>Switch Chain (must be known by the wallet)</h4>
+      <SwitchChainButton chainId={137} />
+      <SwitchChainButton chainId={1} />
+      <SwitchChainButton chainId={5000} />
+    </div>
+  );
+}