fix(go): add reload option to loadMarkets (ccxt#26120)

* fix(go): add reload option to loadMarkets

* update imports

* fix imports

Author: carlosmiei

go/v4/exchange.go

@@ -246,6 +246,15 @@ func (this *Exchange) InitThrottler() {
 	this.Throttler = NewThrottler(this.TokenBucket)
 }
 
+/*
+*
+  - @method
+  - @name Exchange#loadMarkets
+  - @description Loads and prepares the markets for trading.
+  - @param {boolean} param.reload - If true, the markets will be reloaded from the exchange.
+  - @param {object} params - Additional exchange-specific parameters for the request.
+  - @throws An error if the markets cannot be loaded or prepared.
+*/
 func (this *Exchange) LoadMarkets(params ...interface{}) <-chan interface{} {
 	ch := make(chan interface{})
 
@@ -256,28 +265,31 @@ func (this *Exchange) LoadMarkets(params ...interface{}) <-chan interface{} {
 				ch <- "panic:" + ToString(r)
 			}
 		}()
+		reload := GetArg(params, 0, false).(bool)
+		params := GetArg(params, 1, map[string]interface{}{})
 		this.WarmUpCache()
-		if this.Markets != nil && len(this.Markets) > 0 {
-			if this.Markets_by_id == nil && len(this.Markets) > 0 {
-				// Only lock when writing
-				this.marketsMutex.Lock()
-				result := this.SetMarkets(this.Markets, nil)
-				this.marketsMutex.Unlock()
-				ch <- result
+		if !reload {
+			if this.Markets != nil && len(this.Markets) > 0 {
+				if this.Markets_by_id == nil && len(this.Markets) > 0 {
+					// Only lock when writing
+					this.marketsMutex.Lock()
+					result := this.SetMarkets(this.Markets, nil)
+					this.marketsMutex.Unlock()
+					ch <- result
+					return
+				}
+				ch <- this.Markets
 				return
 			}
-			ch <- this.Markets
-			return
 		}
 
 		var currencies interface{} = nil
-		var defaultParams = map[string]interface{}{}
 		hasFetchCurrencies := this.Has["fetchCurrencies"]
 		if IsBool(hasFetchCurrencies) && IsTrue(hasFetchCurrencies) {
-			currencies = <-this.DerivedExchange.FetchCurrencies(defaultParams)
+			currencies = <-this.DerivedExchange.FetchCurrencies(params)
 		}
 
-		markets := <-this.DerivedExchange.FetchMarkets(defaultParams)
+		markets := <-this.DerivedExchange.FetchMarkets(params)
 		PanicOnError(markets)
 
 		// Lock only for writing