CU-86a0cw8d9 - Add support to CryptoCompare exchange

packages/bs-neo-legacy/src/BSNeoLegacy.ts

@@ -4,7 +4,6 @@ import {
   BDSClaimable,
   BlockchainDataService,
   BlockchainService,
-  CalculateTransferFeeResponse,
   Claimable,
   Exchange,
   Token,
@@ -15,12 +14,12 @@ import {
 import { api, sc, u, wallet } from '@cityofzion/neon-js'
 import { DEFAULT_URL_BY_NETWORK_TYPE, LEGACY_NETWORK_BY_NETWORK_TYPE, NATIVE_ASSETS, TOKENS } from './constants'
 import { DoraBDSNeoLegacy } from './DoraBDSNeoLegacy'
+import { CryptoCompareExchange } from './exchange/CryptoCompareExchange'
 
 export class BSNeoLegacy<BSCustomName extends string = string> implements BlockchainService, Claimable {
   dataService!: BlockchainDataService & BDSClaimable
   blockchainName: BSCustomName
   feeToken: Token
-  // Implement an Exchange interface for the legacy blockchain
   exchange!: Exchange
   tokenClaim: Token
   tokens: Token[]
@@ -49,6 +48,7 @@ export class BSNeoLegacy<BSCustomName extends string = string> implements Blockc
     }
     this.network = network
     this.dataService = new DoraBDSNeoLegacy(network)
+    this.exchange = new CryptoCompareExchange(network)
   }
 
   validateAddress(address: string): boolean {

packages/bs-neo-legacy/src/__tests__/BSNeoLegacy.spec.ts

@@ -1,3 +1,4 @@
+import { Currency } from '@cityofzion/blockchain-service'
 import { BSNeoLegacy } from '../BSNeoLegacy'
 import { wallet } from '@cityofzion/neon-js'
 
@@ -62,6 +63,27 @@ describe('BSNeoLegacy', () => {
     const encryptedKey = await wallet.encrypt(account.wif, password)
     const decryptedAccount = await bsNeoLegacy.decryptKey(encryptedKey, password)
     expect(decryptedAccount).toEqual(account)
+  }, 10000)
+
+  it('Should return a list with prices of tokens using USD', async () => {
+    bsNeoLegacy.network.type = 'mainnet'
+    const currency: Currency = 'USD'
+    const tokenPriceList = await bsNeoLegacy.exchange.getTokenPrices(currency)
+    expect(tokenPriceList.length).toBeGreaterThan(0)
+  })
+
+  it('Should return a list with prices of tokens using BRL', async () => {
+    bsNeoLegacy.network.type = 'mainnet'
+    const currency: Currency = 'BRL'
+    const tokenPriceList = await bsNeoLegacy.exchange.getTokenPrices(currency)
+    expect(tokenPriceList.length).toBeGreaterThan(0)
+  })
+
+  it('Should return a list with prices of tokens using EUR', async () => {
+    bsNeoLegacy.network.type = 'mainnet'
+    const currency: Currency = 'EUR'
+    const tokenPriceList = await bsNeoLegacy.exchange.getTokenPrices(currency)
+    expect(tokenPriceList.length).toBeGreaterThan(0)
   })
 
   it.skip('Should be able to transfer a native asset', async () => {

packages/bs-neo-legacy/src/exchange/CryptoCompareExchange.ts

@@ -0,0 +1,39 @@
+import { Currency, Exchange, Network, TokenPricesResponse } from '@cityofzion/blockchain-service'
+import axios, { AxiosInstance } from 'axios'
+import {TOKENS} from '../constants'
+
+type CryptoCompareDataResponse = {
+    RAW: {
+        [symbol: string]: {
+            [currency: string]: {
+                PRICE: number
+            }
+        }
+    }
+}
+
+export class CryptoCompareExchange implements Exchange {
+    network: Network;
+    private axiosInstance: AxiosInstance
+
+    constructor(network: Network) {
+        this.network = network
+        this.axiosInstance = axios.create({ baseURL: "https://min-api.cryptocompare.com" })
+    }
+
+    async getTokenPrices(currency: Currency): Promise<TokenPricesResponse[]> {
+        if (this.network.type !== 'mainnet') throw new Error('Exchange is only available on mainnet')
+        const  tokenSymbols = TOKENS[this.network.type].map(token => token.symbol)
+        const { data: prices } = await this.axiosInstance.get<CryptoCompareDataResponse>("/data/pricemultifull", {
+            params: {
+                fsyms: tokenSymbols.join(','),
+                tsyms: currency
+            }
+        })
+        return Object.entries(prices.RAW).map(([symbol, price]) => ({
+            symbol,
+            amount: price[currency].PRICE
+        }))
+    }
+
+}