exchanges/engine: Add multichain deposit/withdrawal support (#794)

* Add exchange multichain support

* Start tidying up

* Add multichain transfer support for Bitfinex and fix poloniex bug

* Add Coinbene multichain support

* Start adjusting the deposit address manager

* Fix deposit tests and further enhancements

* Cleanup

* Add bypass flag, expand tests plus error coverage for Huobi

Adjust helpers

* Address nitterinos

* BFX wd changes

* Address nitterinos

* Minor fixes rebasing on master

* Fix BFX acceptableMethods test

* Add some TO-DOs for 2 tests WRT races

* Fix acceptableMethods test round 2

* Address nitterinos

currency/code_types.go

@@ -1665,4 +1665,5 @@ var (
 	BUSD       = NewCode("BUSD")
 	SRM        = NewCode("SRM")
 	FTT        = NewCode("FTT")
+	UST        = NewCode("UST")
 )

currency/currency_test.go

@@ -57,7 +57,7 @@ func TestGetDefaultBaseCurrency(t *testing.T) {
 }
 
 func TestGetDefaulCryptoCurrencies(t *testing.T) {
-	expected := Currencies{BTC, LTC, ETH, DOGE, DASH, XRP, XMR}
+	expected := Currencies{BTC, LTC, ETH, DOGE, DASH, XRP, XMR, USDT, UST}
 	if !GetDefaultCryptocurrencies().Match(expected) {
 		t.Errorf("GetDefaultCryptocurrencies() expected %s but received %s",
 			expected, GetDefaultCryptocurrencies())

currency/storage.go

@@ -36,7 +36,7 @@ func (s *Storage) SetDefaults() {
 		log.Errorf(log.Global, "Currency Storage: Setting default fiat currencies error: %s", err)
 	}
 
-	err = s.SetDefaultCryptocurrencies(BTC, LTC, ETH, DOGE, DASH, XRP, XMR)
+	err = s.SetDefaultCryptocurrencies(BTC, LTC, ETH, DOGE, DASH, XRP, XMR, USDT, UST)
 	if err != nil {
 		log.Errorf(log.Global, "Currency Storage: Setting default cryptocurrencies error: %s", err)
 	}