[WIP]Get UTXOs

ZcashLightClientKit/DAO/UnspentTransactionOutputDAO.swift

@@ -0,0 +1,22 @@
+//
+//  UnspentTransactionOutputDAO.swift
+//  ZcashLightClientKit
+//
+//  Created by Francisco Gindre on 12/9/20.
+//
+
+import Foundation
+
+struct UTXO: UnspentTransactionOutputEntity {
+    var address: String
+    
+    var txid: Data
+    
+    var index: Int32
+    
+    var script: Data
+    
+    var valueZat: Int64
+    
+    var height: UInt64
+}

ZcashLightClientKit/Entity/UnspentTransactionOutputEntity.swift

@@ -0,0 +1,24 @@
+//
+//  UnspentTransactionOutputEntity.swift
+//  ZcashLightClientKit
+//
+//  Created by Francisco Gindre on 12/9/20.
+//
+
+import Foundation
+
+public protocol UnspentTransactionOutputEntity {
+    
+    var address: String { get set }
+    
+    var txid: Data {get set}
+
+    var index: Int32 {get set}
+
+    var script: Data {get set}
+
+    var valueZat: Int64 {get set}
+
+    var height: UInt64 {get set}
+
+}

ZcashLightClientKit/Service/LightWalletGRPCService.swift

@@ -75,8 +75,7 @@ public class LightWalletGRPCService {
                     requestIDProvider: .autogenerated,
                     requestIDHeader: nil,
                     cacheable: false)
-    }
-
+    } 
 }
 
 extension LightWalletGRPCService: LightWalletService {
@@ -218,6 +217,39 @@ extension LightWalletGRPCService: LightWalletService {
         }
         return height
     }
+    
+    public func fetchUTXOs(for tAddress: String, result: @escaping (Result<[UnspentTransactionOutputEntity], LightWalletServiceError>) -> Void) {
+        queue.async { [weak self] in
+            guard let self = self else { return }
+            let arg = GetAddressUtxosArg.with { (utxoArgs) in
+                utxoArgs.address = tAddress
+            }
+            var utxos = [UnspentTransactionOutputEntity]()
+            let response = self.compactTxStreamer.getAddressUtxosStream(arg) { (reply) in
+                utxos.append(
+                    UTXO(address: tAddress,
+                         txid: reply.txid,
+                         index: reply.index,
+                         script: reply.script,
+                         valueZat: reply.valueZat,
+                         height: UInt64(reply.valueZat)
+                    )
+                )
+            }
+            
+            do {
+                let status = try response.status.wait()
+                switch status.code {
+                case .ok:
+                    result(.success(utxos))
+                default:
+                    result(.failure(.mapCode(status)))
+                }
+            } catch {
+                result(.failure(error.mapToServiceError()))
+            }
+        }
+    }
 }
 
 extension Error {

ZcashLightClientKit/Service/LightWalletService.swift

@@ -168,4 +168,7 @@ public protocol LightWalletService {
      - Returns: LightWalletServiceResponse
      */
     func fetchTransaction(txId: Data, result: @escaping (Result<TransactionEntity,LightWalletServiceError>) -> Void)
+    
+    
+    func fetchUTXOs(for tAddress: String, result: @escaping(Result<[UnspentTransactionOutputEntity], LightWalletServiceError>) -> Void)
 }