feat(rpc): ListCurrencies enhancement

Closes #1067.

Author: rsercano

docs/api.md

@@ -1,6 +1,6 @@
 import { Arguments } from 'yargs';
 import { callback, loadXudClient } from '../command';
-import { AddCurrencyRequest } from '../../proto/xudrpc_pb';
+import { Currency } from '../../proto/xudrpc_pb';
 import { SwapClientType } from '../../constants/enums';
 
 export const command = 'addcurrency <currency> <swap_client> [decimal_places] [token_address]';
@@ -29,7 +29,7 @@ export const builder = {
 };
 
 export const handler = (argv: Arguments) => {
-  const request = new AddCurrencyRequest();
+  const request = new Currency();
   request.setCurrency(argv.currency.toUpperCase());
   request.setSwapClient(Number(SwapClientType[argv.swap_client]));
   request.setTokenAddress(argv.token_address);

lib/cli/commands/addcurrency.ts

@@ -0,0 +1,48 @@
+import { callback, loadXudClient } from '../command';
+import { Arguments } from 'yargs';
+import colors from 'colors/safe';
+import Table, { HorizontalTable } from 'cli-table3';
+import { ListCurrenciesRequest, ListCurrenciesResponse } from '../../proto/xudrpc_pb';
+import { SwapClientType } from '../../constants/enums';
+
+const HEADERS = [
+  colors.blue('Ticker'),
+  colors.blue('Digits'),
+  colors.blue('Token Address'),
+  colors.blue('Swap Client'),
+];
+
+const formatCurrencies = (currencies: ListCurrenciesResponse.AsObject) => {
+  const formatted: any[] = [];
+  currencies.currenciesList.forEach((currency) => {
+    const element = [];
+    element.push(currency.currency, currency.decimalPlaces, currency.tokenAddress, SwapClientType[currency.swapClient]);
+    formatted.push(element);
+  });
+  return formatted;
+};
+
+const createTable = () => {
+  const table = new Table({
+    head: HEADERS,
+  }) as HorizontalTable;
+  return table;
+};
+
+const displayTable = (response: ListCurrenciesResponse.AsObject) => {
+  const table = createTable();
+
+  formatCurrencies(response).forEach((currency) => {
+    table.push(currency);
+  });
+  console.log(colors.underline(colors.bold('\nCurrencies:')));
+  console.log(table.toString());
+};
+
+export const command = 'listcurrencies';
+
+export const describe = 'list available currencies';
+
+export const handler = (argv: Arguments) => {
+  loadXudClient(argv).listCurrencies(new ListCurrenciesRequest(), callback(argv, displayTable));
+};

lib/cli/commands/listcurrencies.ts

@@ -12,7 +12,7 @@ import { errorCodes as lndErrorCodes } from '../lndclient/errors';
 import { LndInfo } from '../lndclient/types';
 import { SwapSuccess, SwapFailure } from '../swaps/types';
 import { SwapFailureReason } from '../constants/enums';
-import { TradeInstance, OrderInstance } from '../db/types';
+import { TradeInstance, OrderInstance, CurrencyInstance } from '../db/types';
 
 /**
  * Creates an xudrpc Order message from an [[Order]].
@@ -227,7 +227,7 @@ class GrpcService {
   /**
    * See [[Service.addCurrency]]
    */
-  public addCurrency: grpc.handleUnaryCall<xudrpc.AddCurrencyRequest, xudrpc.AddCurrencyResponse> = async (call, callback) => {
+  public addCurrency: grpc.handleUnaryCall<xudrpc.Currency, xudrpc.AddCurrencyResponse> = async (call, callback) => {
     try {
       await this.service.addCurrency(call.request.toObject());
       const response = new xudrpc.AddCurrencyResponse();
@@ -499,9 +499,17 @@ class GrpcService {
    */
   public listCurrencies: grpc.handleUnaryCall<xudrpc.ListCurrenciesRequest, xudrpc.ListCurrenciesResponse> = (_, callback) => {
     try {
-      const listCurrenciesResponse = this.service.listCurrencies();
+      const currencies = this.service.listCurrencies();
       const response = new xudrpc.ListCurrenciesResponse();
-      response.setCurrenciesList(listCurrenciesResponse);
+
+      currencies.forEach((currency: CurrencyInstance) => {
+        const resultCurrency = new xudrpc.Currency();
+        resultCurrency.setDecimalPlaces(currency.decimalPlaces);
+        resultCurrency.setCurrency(currency.id);
+        resultCurrency.setTokenAddress(currency.tokenAddress);
+        resultCurrency.setSwapClient(currency.swapClient as number);
+        response.getCurrenciesList().push(resultCurrency);
+      });
 
       callback(null, response);
     } catch (err) {

lib/grpc/GrpcService.ts

@@ -90,7 +90,7 @@ class OrderBook extends EventEmitter {
   }
 
   public get currencies() {
-    return this.currencyInstances.keys();
+    return this.currencyInstances;
   }
 
   constructor({ logger, models, thresholds, pool, swaps, nosanityswaps, nobalancechecks, nomatching = false }: