Feature/add currency helpers (#531)

* Exporting Coin struct, needed for wallet

* Adding currency helpers

clients/validator/package.json

@@ -34,6 +34,7 @@
     "@cosmjs/cosmwasm-stargate": "^0.24.0-alpha.18",
     "@cosmjs/crypto": "^0.24.0-alpha.18",
     "@cosmjs/launchpad": "^0.24.0-alpha.18",
-    "@cosmjs/proto-signing": "^0.24.0-alpha.18"
+    "@cosmjs/proto-signing": "^0.24.0-alpha.18",
+    "@cosmjs/math": "^0.24.0-alpha.18"
   }
-}
+}

clients/validator/src/currency.ts

@@ -0,0 +1,59 @@
+import { Decimal } from "@cosmjs/math";
+import { Coin } from ".";
+
+// NARROW NO-BREAK SPACE (U+202F)
+const thinSpace = "\u202F";
+
+export function printableCoin(coin?: Coin): string {
+    if (!coin) {
+        return "0";
+    }
+    if (coin.denom.startsWith("u")) {
+        const ticker = coin.denom.slice(1).toUpperCase();
+        return Decimal.fromAtomics(coin.amount, 6).toString() + thinSpace + ticker;
+    } else {
+        return coin.amount + thinSpace + coin.denom;
+    }
+}
+
+export function printableBalance(balance?: readonly Coin[]): string {
+    if (!balance || balance.length === 0) return "–";
+    return balance.map(printableCoin).join(", ");
+}
+
+export interface MappedCoin {
+    readonly denom: string;
+    readonly fractionalDigits: number;
+}
+
+export interface CoinMap {
+    readonly [key: string]: MappedCoin;
+}
+
+export function nativeCoinToDisplay(coin: Coin, coinMap: CoinMap): Coin {
+    if (!coinMap) return coin;
+
+    const coinToDisplay = coinMap[coin.denom];
+    if (!coinToDisplay) return coin;
+
+    const amountToDisplay = Decimal.fromAtomics(coin.amount, coinToDisplay.fractionalDigits).toString();
+
+    return { denom: coinToDisplay.denom, amount: amountToDisplay };
+}
+
+// display amount is eg "12.0346", return is in native tokens
+// with 6 fractional digits, this would be eg. "12034600"
+export function displayAmountToNative(
+    amountToDisplay: string,
+    coinMap: CoinMap,
+    nativeDenom: string,
+): string {
+    const fractionalDigits = coinMap[nativeDenom]?.fractionalDigits;
+    if (fractionalDigits) {
+        // use https://github.com/CosmWasm/cosmjs/blob/v0.22.2/packages/math/src/decimal.ts
+        const decimalAmount = Decimal.fromUserInput(amountToDisplay, fractionalDigits);
+        return decimalAmount.atomics;
+    }
+
+    return amountToDisplay;
+}

clients/validator/src/index.ts

@@ -1,15 +1,18 @@
 import NetClient, { INetClient } from "./net-client";
-import { MixNode, MixNodeBond } from "./types";
+import { Gateway, GatewayBond, MixNode, MixNodeBond } from "./types";
 // import * as fs from "fs";
 import { Bip39, Random } from "@cosmjs/crypto";
 import { DirectSecp256k1HdWallet } from "@cosmjs/proto-signing";
 import MixnodesCache from "./caches/mixnodes";
-import { Coin, coins } from "@cosmjs/launchpad";
+import { coin, Coin, coins } from "@cosmjs/launchpad";
 import { BroadcastTxResponse } from "@cosmjs/stargate/types"
 import { ExecuteResult, InstantiateOptions, InstantiateResult, UploadMeta, UploadResult } from "@cosmjs/cosmwasm";
+import { CoinMap, displayAmountToNative, MappedCoin, nativeCoinToDisplay, printableBalance, printableCoin } from "./currency";
+import GatewaysCache from "./caches/gateways";
 
 export { coins };
 export { Coin };
+export { displayAmountToNative, nativeCoinToDisplay, printableCoin, printableBalance, MappedCoin, CoinMap }
 
 export default class ValidatorClient {
     private readonly stakeDenom: string = "unym"
@@ -124,7 +127,7 @@ export default class ValidatorClient {
         console.log(`account ${this.address} unbonded mixnode`);
         return result;
     }
-    
+
     /**
      * Get or refresh the list of gateways in the network.
      *