engine/exchanges: Add GetCurrencyTradeURL wrapper func/gRPC endpoint (#1521)

* beginning the concept

* expands testing and implementations

* test standardisation, expansion

* more

* finish remainder, add rpc func

* lint

* grammar? I barely know her!

* wow i forgot something wow wow wow wow

* rm SendPayload

* enFixio!

* improve binance long-dated support

* update test design, update wrapper funcs

* adds kraken futures, adds bybit support

* fixes SIMPLE bugs

* s is for sucks

* fixed option url x2

* fixed silly test

exchanges/exmo/exmo.go

@@ -20,6 +20,7 @@ import (
 const (
 	exmoAPIURL     = "https://api.exmo.com"
 	exmoAPIVersion = "1"
+	tradeBaseURL   = "https://exmo.com/trade/pro/"
 
 	exmoTrades       = "trades"
 	exmoOrderbook    = "order_book"

exchanges/exmo/exmo_test.go

@@ -7,6 +7,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 	"github.com/thrasher-corp/gocryptotrader/common"
 	"github.com/thrasher-corp/gocryptotrader/config"
 	"github.com/thrasher-corp/gocryptotrader/core"
@@ -16,6 +18,7 @@ import (
 	"github.com/thrasher-corp/gocryptotrader/exchanges/order"
 	"github.com/thrasher-corp/gocryptotrader/exchanges/sharedtestvalues"
 	"github.com/thrasher-corp/gocryptotrader/exchanges/ticker"
+	testexch "github.com/thrasher-corp/gocryptotrader/internal/testing/exchange"
 	"github.com/thrasher-corp/gocryptotrader/portfolio/withdraw"
 )
 
@@ -534,3 +537,16 @@ func TestGetWithdrawalsHistory(t *testing.T) {
 		t.Error(err)
 	}
 }
+
+func TestGetCurrencyTradeURL(t *testing.T) {
+	t.Parallel()
+	testexch.UpdatePairsOnce(t, e)
+	for _, a := range e.GetAssetTypes(false) {
+		pairs, err := e.CurrencyPairs.GetPairs(a, false)
+		require.NoError(t, err, "cannot get pairs for %s", a)
+		require.NotEmpty(t, pairs, "no pairs for %s", a)
+		resp, err := e.GetCurrencyTradeURL(context.Background(), a, pairs[0])
+		require.NoError(t, err)
+		assert.NotEmpty(t, resp)
+	}
+}

exchanges/exmo/exmo_wrapper.go

@@ -792,3 +792,13 @@ func (e *EXMO) GetLatestFundingRates(context.Context, *fundingrate.LatestRateReq
 func (e *EXMO) UpdateOrderExecutionLimits(_ context.Context, _ asset.Item) error {
 	return common.ErrNotYetImplemented
 }
+
+// GetCurrencyTradeURL returns the URL to the exchange's trade page for the given asset and currency pair
+func (e *EXMO) GetCurrencyTradeURL(_ context.Context, a asset.Item, cp currency.Pair) (string, error) {
+	_, err := e.CurrencyPairs.IsPairEnabled(cp, a)
+	if err != nil {
+		return "", err
+	}
+	cp.Delimiter = currency.UnderscoreDelimiter
+	return tradeBaseURL + cp.Upper().String() + "/", nil
+}