add mutex to map assign

endpoints.go

@@ -405,7 +405,8 @@ func NewMultiUtxoTxs() {
 			return
 		}
 
-		ret := make(format.EIUtxoReturn, len(rf))
+		var ret format.EIUtxoReturn
+		ret.Ret = make(format.EIUtxoReturnMap, len(rf))
 		var wg2 sync.WaitGroup
 		for key, elem := range rf {
 			wg2.Add(1)
@@ -443,11 +444,11 @@ func NewMultiUtxoTxs() {
 						temp.Utxos = append(temp.Utxos, elem)
 					}
 				}
-				ret[key] = temp
+				ret.Assign(key, temp)
 			}(&wg2, key, elem)
 		}
 		wg2.Wait()
-		erpc.MarshalSend(w, ret)
+		erpc.MarshalSend(w, ret.Ret)
 	})
 }
 

format/return.go

@@ -1,13 +1,28 @@
 package format
 
+import "sync"
+
 // UtxoTxReturn is the return structure used in /utxotxs
 type UtxoTxReturn struct {
 	Utxos        [][]Utxo             `json:"Utxos"`
 	Transactions []MultigetAddrReturn `json:"Txs"`
 }
 
+// EIUtxoReturnMap is a map helper
+type EIUtxoReturnMap map[string]UtxoTxReturn
+
 // EIUtxoReturn is the reutrn structure used in /nutxotxs
-type EIUtxoReturn map[string]UtxoTxReturn
+type EIUtxoReturn struct {
+	Ret map[string]UtxoTxReturn
+	mu  sync.Mutex
+}
+
+// Assign assigns key:elem in a map and locks mutex
+func (a *EIUtxoReturn) Assign(key string, elem UtxoTxReturn) {
+	a.mu.Lock()
+	a.Ret[key] = elem
+	a.mu.Unlock()
+}
 
 // BalTxReturn is a struct used for the baltxs endpoint
 type BalTxReturn struct {