okex: add local symbol convert function

pkg/exchange/okex/convert.go

@@ -5,3 +5,12 @@ import "strings"
 func toGlobalSymbol(symbol string) string {
 	return strings.ReplaceAll(symbol, "-", "")
 }
+
+func toLocalSymbol(symbol string) string {
+	if s, ok := symbolMap[symbol]; ok {
+		return s
+	}
+
+	log.Errorf("failed to look up local symbol from %s", symbol)
+	return symbol
+}

pkg/exchange/okex/exchange.go

@@ -9,6 +9,8 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
+//go:generate sh -c "echo \"package okex\nvar symbolMap = map[string]string{\n\" $(curl -s -L 'https://okex.com/api/v5/public/instruments?instType=SPOT' | jq -r '.data[] | \"\\(.instId | sub(\"-\" ; \"\") | tojson ): \\( .instId | tojson),\n\"') \"\n}\" > symbols.go"
+
 // OKB is the platform currency of OKEx, pre-allocate static string here
 const OKB = "OKB"