feat(cli): add getethmnemonic

lib/cli/commands/getethmnemonic.ts

@@ -0,0 +1,20 @@
+import { Arguments } from 'yargs';
+import { GetMnemonicRequest, GetEthMnemonicResponse } from '../../proto/xudrpc_pb';
+import { callback, loadXudClient } from '../command';
+import { ethers } from 'ethers';
+
+const formatOutput = (response: GetEthMnemonicResponse.AsObject) => {
+  const { seedMnemonic } = response;
+  console.log(`Your Ethereum account mnemonic seed is: "${seedMnemonic}"`);
+  const wallet = ethers.Wallet.fromMnemonic(seedMnemonic);
+  console.log(`\nAlternatively, you can also use the following private key to import account with MetaMask: "${wallet.privateKey}"`);
+  console.log('\nHow to import an account: https://metamask.zendesk.com/hc/en-us/articles/360015489331-How-to-import-an-Account');
+};
+
+export const command = 'getethmnemonic';
+
+export const describe = 'show the Ethereum seed mnemonic';
+
+export const handler = async (argv: Arguments) => {
+  (await loadXudClient(argv)).getETHMnemonic(new GetMnemonicRequest(), callback(argv, formatOutput));
+};

lib/grpc/GrpcService.ts

@@ -599,6 +599,23 @@ class GrpcService {
     }
   }
 
+  /**
+   * See [[Service.getETHMnemonic]]
+   */
+  public getETHMnemonic: grpc.handleUnaryCall<xudrpc.GetMnemonicRequest, xudrpc.GetEthMnemonicResponse> = async (_, callback) => {
+    if (!this.isReady(this.service, callback)) {
+      return;
+    }
+    try {
+      const mnemonic = await this.service.getETHMnemonic();
+      const response = new xudrpc.GetEthMnemonicResponse();
+      response.setSeedMnemonic(mnemonic);
+      callback(null, response);
+    } catch (err) {
+      callback(getGrpcError(err), null);
+    }
+  }
+
   /**
    * See [[Service.getNodeInfo]]
    */