remove onBalanceMethod, add cleaners support

Author: hakob91

src/info/sigma/zcoinEngineExtension.js

@@ -91,13 +91,6 @@ export class ZcoinEngineExtension implements CurrencyEngineExtension {
     }
   }
 
-  onBalanceChanged() {
-    this.currencyEngine.callbacks.onBalanceChanged(
-      this.currencyEngine.currencyCode,
-      this.engineState.getBalance({ mintedBalance: true })
-    )
-  }
-
   async saveTx(edgeTransaction: EdgeTransaction) {
     const { otherParams = {}, txid = '' } = edgeTransaction
     const {
@@ -146,7 +139,7 @@ export class ZcoinEngineExtension implements CurrencyEngineExtension {
 
     const updated = await this.updateMintMetadata()
     if (updated) {
-      this.onBalanceChanged()
+      this.currencyEngine.onBalanceChanged()
     }
   }
 

src/info/sigma/zcoinStateExtension.js

@@ -6,8 +6,11 @@ import { EngineState } from '../../engine/engineState'
 import { EngineStateExtension } from '../../engine/engineStateExtension'
 import type { StratumTask } from '../../stratum/stratumConnection'
 import { logger } from '../../utils/logger'
-import type { PrivateCoin } from '../zcoins'
-import { SIGMA_ENCRYPTED_FILE } from '../zcoins'
+import {
+  type PrivateCoin,
+  asPrivateCoinArray,
+  SIGMA_ENCRYPTED_FILE
+} from '../zcoins'
 import { type SpendCoin } from './coinUtils'
 import {
   fetchTransactionVerbose,
@@ -353,7 +356,7 @@ export class ZcoinStateExtension implements EngineStateExtension {
       const jsonString = await this.encryptedLocalDisklet.getText(
         SIGMA_ENCRYPTED_FILE
       )
-      mints = JSON.parse(jsonString)
+      mints = asPrivateCoinArray(jsonString)
     } catch (e) {
       logger.error('something went wrong ', e)
     }

src/info/zcoins.js

@@ -1,5 +1,6 @@
 // @flow
 
+import { asArray, asBoolean, asNumber, asObject, asString } from 'cleaners'
 import { type EdgeCurrencyInfo } from 'edge-core-js/types'
 
 import type { EngineCurrencyInfo } from '../engine/currencyEngine.js'
@@ -25,15 +26,19 @@ export const DENOMINATIONS = [
   '10000000000'
 ]
 
-export type PrivateCoin = {
-  value: number,
-  index: number,
-  commitment: string,
-  serialNumber: string,
-  groupId: number,
-  isSpend: boolean,
-  spendTxId: string
-}
+export const asPrivateCoin = asObject({
+  value: asNumber,
+  index: asNumber,
+  commitment: asString,
+  serialNumber: asString,
+  groupId: asNumber,
+  isSpend: asBoolean,
+  spendTxId: asString
+})
+
+export const asPrivateCoinArray = asArray(asPrivateCoin)
+
+export type PrivateCoin = $Call<typeof asPrivateCoin>
 
 const bcoinInfo: BcoinCurrencyInfo = {
   type: 'zcoins',