Add helper methods to parse gas, fees and gasPrice (#29)

Part of [Service provider auctions for web deployments](https://www.notion.so/Service-provider-auctions-for-web-deployments-104a6b22d47280dbad51d28aa3a91d75)

Co-authored-by: IshaVenikar <ishavenikar7@gmail.com>
Reviewed-on: #29
Co-authored-by: Prathamesh Musale <prathamesh@noreply.git.vdb.to>
Co-committed-by: Prathamesh Musale <prathamesh@noreply.git.vdb.to>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@cerc-io/registry-sdk",
-  "version": "0.2.10",
+  "version": "0.2.11",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "repository": "git@github.com:cerc-io/registry-sdk.git",

src/index.ts

@@ -588,3 +588,4 @@ export { LaconicClient };
 export * from './constants';
 export * from './types/cerc/bond/message';
 export * from './types/cerc/onboarding/message';
+export { getGasPrice, parseGasAndFees } from './util';

src/util.ts

@@ -1,6 +1,8 @@
 import * as Block from 'multiformats/block';
 import { sha256 as hasher } from 'multiformats/hashes/sha2';
+import assert from 'assert';
 
+import { GasPrice, StdFee, parseCoins } from '@cosmjs/stargate';
 import * as dagCBOR from '@ipld/dag-cbor';
 import * as dagJSON from '@ipld/dag-json';
 
@@ -22,7 +24,7 @@ export class Util {
 
     let keys = Object.keys(obj);
     keys = keys.sort();
-    const newObject: {[key: string]: any} = {};
+    const newObject: { [key: string]: any } = {};
 
     for (let i = 0; i < keys.length; i++) {
       newObject[keys[i]] = Util.sortJSON(obj[keys[i]]);
@@ -77,7 +79,7 @@ export class Util {
    * Unmarshal attributes array to object.
    */
   static fromGQLAttributes (attributes: any[] = []) {
-    const res: {[key: string]: any} = {};
+    const res: { [key: string]: any } = {};
 
     attributes.forEach(attr => {
       res[attr.key] = (attr.value === null) ? null : this.fromGQLValue(attr.value);
@@ -119,3 +121,33 @@ export class Util {
     return block.cid.toString();
   }
 }
+
+/**
+ * Get gas in proper format
+ */
+export const parseGasAndFees = (gas?: string, fees?: string): StdFee | undefined | number => {
+  // If fees is not given or a number, treat it as a gas estimation multiplier
+  if (fees === null || fees === undefined) {
+    return undefined;
+  }
+
+  const isFeesANumber = !isNaN(Number(fees));
+  if (isFeesANumber) {
+    return Number(fees);
+  }
+
+  // If fees is not a gas estimation multiplier, gas is required
+  assert(gas, 'Invalid gas.');
+
+  return {
+    amount: parseCoins(String(fees)),
+    gas: String(gas)
+  };
+};
+
+/**
+ * Get gas price in proper format
+ */
+export const getGasPrice = (gasPrice: string | null): GasPrice | undefined => {
+  return gasPrice != null ? GasPrice.fromString(String(gasPrice)) : undefined;
+};