add mutex to libepiccash

lib/wallets/example/libepiccash.dart

@@ -13,6 +13,7 @@ import 'package:stackwallet/models/isar/models/blockchain_data/epic_transaction.
 ///
 abstract class LibEpiccash {
   static final Mutex _mutex = Mutex();
+  static final Mutex m = Mutex();
 
   ///
   /// Check if [address] is a valid epiccash address according to libepiccash
@@ -36,6 +37,7 @@ abstract class LibEpiccash {
   // TODO: ensure the above documentation comment is correct
   // TODO: ensure this will always return the mnemonic. If not, this function should throw an exception
   //Function is used in _getMnemonicList()
+  // wrap in mutex? -> would need to be Future<String>
   static String getMnemonic() {
     try {
       String mnemonic = lib_epiccash.walletMnemonic();
@@ -77,6 +79,7 @@ abstract class LibEpiccash {
     required String password,
     required String name,
   }) async {
+    return await m.protect(() async {
       try {
         return await compute(
           _initializeWalletWrapper,
@@ -90,6 +93,7 @@ abstract class LibEpiccash {
       } catch (e) {
         throw ("Error creating new wallet : ${e.toString()}");
       }
+    });
   }
 
   ///
@@ -116,6 +120,7 @@ abstract class LibEpiccash {
           {required String wallet,
           required int refreshFromNode,
           required int minimumConfirmations}) async {
+    return await m.protect(() async {
       try {
         String balances = await compute(_walletBalancesWrapper, (
           wallet: wallet,
@@ -144,6 +149,7 @@ abstract class LibEpiccash {
       } catch (e) {
         throw ("Error getting wallet info : ${e.toString()}");
       }
+    });
   }
 
   ///
@@ -167,6 +173,7 @@ abstract class LibEpiccash {
     required int startHeight,
     required int numberOfBlocks,
   }) async {
+    return await m.protect(() async {
       try {
         return await compute(_scanOutputsWrapper, (
           wallet: wallet,
@@ -176,6 +183,7 @@ abstract class LibEpiccash {
       } catch (e) {
         throw ("Error getting scanning outputs : ${e.toString()}");
       }
+    });
   }
 
   ///
@@ -214,6 +222,7 @@ abstract class LibEpiccash {
     required int minimumConfirmations,
     required String note,
   }) async {
+    return await m.protect(() async {
       try {
         String result = await compute(_createTransactionWrapper, (
           wallet: wallet,
@@ -244,6 +253,7 @@ abstract class LibEpiccash {
       } catch (e) {
         throw ("Error creating epic transaction : ${e.toString()}");
       }
+    });
   }
 
   ///
@@ -268,6 +278,7 @@ abstract class LibEpiccash {
     required String wallet,
     required int refreshFromNode,
   }) async {
+    return await m.protect(() async {
       try {
         var result = await compute(_getTransactionsWrapper, (
           wallet: wallet,
@@ -275,7 +286,8 @@ abstract class LibEpiccash {
         ));
 
         if (result.toUpperCase().contains("ERROR")) {
-        throw Exception("Error getting epic transactions ${result.toString()}");
+          throw Exception(
+              "Error getting epic transactions ${result.toString()}");
         }
 
 //Parse the returned data as an EpicTransaction
@@ -290,6 +302,7 @@ abstract class LibEpiccash {
       } catch (e) {
         throw ("Error getting epic transactions : ${e.toString()}");
       }
+    });
   }
 
   ///
@@ -315,6 +328,7 @@ abstract class LibEpiccash {
     required String wallet,
     required String transactionId,
   }) async {
+    return await m.protect(() async {
       try {
         return await compute(_cancelTransactionWrapper, (
           wallet: wallet,
@@ -323,6 +337,7 @@ abstract class LibEpiccash {
       } catch (e) {
         throw ("Error canceling epic transaction : ${e.toString()}");
       }
+    });
   }
 
   static Future<int> _chainHeightWrapper(
@@ -336,11 +351,13 @@ abstract class LibEpiccash {
   static Future<int> getChainHeight({
     required String config,
   }) async {
+    return await m.protect(() async {
       try {
         return await compute(_chainHeightWrapper, (config: config,));
       } catch (e) {
         throw ("Error getting chain height : ${e.toString()}");
       }
+    });
   }
 
   ///
@@ -368,6 +385,7 @@ abstract class LibEpiccash {
     required int index,
     required String epicboxConfig,
   }) async {
+    return await m.protect(() async {
       try {
         return await compute(_addressInfoWrapper, (
           wallet: wallet,
@@ -377,6 +395,7 @@ abstract class LibEpiccash {
       } catch (e) {
         throw ("Error getting address info : ${e.toString()}");
       }
+    });
   }
 
   ///
@@ -406,6 +425,7 @@ abstract class LibEpiccash {
     required int minimumConfirmations,
     required int available,
   }) async {
+    return await m.protect(() async {
       try {
         String fees = await compute(_transactionFeesWrapper, (
           wallet: wallet,
@@ -464,6 +484,7 @@ abstract class LibEpiccash {
       } catch (e) {
         throw (e.toString());
       }
+    });
   }
 
   ///