API: add ApiWallet.lastUpdate

doc/API.md

@@ -112,7 +112,8 @@ Response:
         utxos: [(utxos detail)],
         balance: 0,
         zpub: ""
-    }
+    },
+    lastUpdate: 0
 }
 ```
 

src/main/java/com/samourai/whirlpool/cli/api/protocol/beans/ApiWallet.java

@@ -7,11 +7,13 @@ import java.util.stream.Collectors;
 
 public class ApiWallet {
   private Collection<ApiUtxo> utxos;
+  private long lastUpdate;
   private long balance;
   private String zpub;
 
   public ApiWallet(
       Collection<WhirlpoolUtxo> whirlpoolUtxos,
+      long lastUpdate,
       String zpub,
       Comparator<WhirlpoolUtxo> comparator,
       int mixsTargetMin) {
@@ -21,6 +23,7 @@ public class ApiWallet {
             .sorted(comparator)
             .map(whirlpoolUtxo -> new ApiUtxo(whirlpoolUtxo, mixsTargetMin))
             .collect(Collectors.toList());
+    this.lastUpdate = lastUpdate;
     this.balance =
         whirlpoolUtxos.stream().mapToLong(whirlpoolUtxo -> whirlpoolUtxo.getUtxo().value).sum();
     this.zpub = zpub;
@@ -30,6 +33,10 @@ public class ApiWallet {
     return utxos;
   }
 
+  public long getLastUpdate() {
+    return lastUpdate;
+  }
+
   public long getBalance() {
     return balance;
   }

src/main/java/com/samourai/whirlpool/cli/api/protocol/rest/ApiWalletUtxosResponse.java

@@ -47,9 +47,10 @@ public class ApiWalletUtxosResponse {
       WhirlpoolWallet whirlpoolWallet,
       Comparator<WhirlpoolUtxo> comparator) {
     Collection<WhirlpoolUtxo> utxos = whirlpoolWallet.getUtxoSupplier().findUtxos(account);
+    long lastUpdate = whirlpoolWallet.getUtxoSupplier().getLastUpdate();
     String zpub = whirlpoolWallet.getWalletSupplier().getWallet(account).getZpub();
     int mixsTargetMin = whirlpoolWallet.getConfig().getMixsTarget();
-    return new ApiWallet(utxos, zpub, comparator, mixsTargetMin);
+    return new ApiWallet(utxos, lastUpdate, zpub, comparator, mixsTargetMin);
   }
 
   public ApiWallet getDeposit() {