wallet2_api: support for sweeping all

src/wallet/api/wallet.cpp

@@ -540,15 +540,14 @@ int WalletImpl::autoRefreshInterval() const
 //    - unconfirmed_transfer_details;
 //    - confirmed_transfer_details)
 
-PendingTransaction *WalletImpl::createTransaction(const string &dst_addr, const string &payment_id, uint64_t amount, uint32_t mixin_count,
+PendingTransaction *WalletImpl::createTransaction(const string &dst_addr, const string &payment_id, optional<uint64_t> amount, uint32_t mixin_count,
                                                   PendingTransaction::Priority priority)
 
 {
     clearStatus();
     // Pause refresh thread while creating transaction
     pauseRefresh();
-    vector<cryptonote::tx_destination_entry> dsts;
-    cryptonote::tx_destination_entry de;
+    cryptonote::account_public_address addr;
 
     // indicates if dst_addr is integrated address (address + payment_id)
     bool has_payment_id;
@@ -561,7 +560,7 @@ PendingTransaction *WalletImpl::createTransaction(const string &dst_addr, const
     PendingTransactionImpl * transaction = new PendingTransactionImpl(*this);
 
     do {
-        if(!cryptonote::get_account_integrated_address_from_str(de.addr, has_payment_id, payment_id_short, m_wallet->testnet(), dst_addr)) {
+        if(!cryptonote::get_account_integrated_address_from_str(addr, has_payment_id, payment_id_short, m_wallet->testnet(), dst_addr)) {
             // TODO: copy-paste 'if treating as an address fails, try as url' from simplewallet.cpp:1982
             m_status = Status_Error;
             m_errorString = "Invalid destination address";
@@ -595,14 +594,23 @@ PendingTransaction *WalletImpl::createTransaction(const string &dst_addr, const
             }
         }
 
-        de.amount = amount;
-        dsts.push_back(de);
         //std::vector<tools::wallet2::pending_tx> ptx_vector;
 
         try {
-            transaction->m_pending_tx = m_wallet->create_transactions_2(dsts, fake_outs_count, 0 /* unlock_time */,
-                                                                      static_cast<uint32_t>(priority),
-                                                                      extra, m_trustedDaemon);
+            if (amount) {
+                vector<cryptonote::tx_destination_entry> dsts;
+                cryptonote::tx_destination_entry de;
+                de.addr = addr;
+                de.amount = *amount;
+                dsts.push_back(de);
+                transaction->m_pending_tx = m_wallet->create_transactions_2(dsts, fake_outs_count, 0 /* unlock_time */,
+                                                                          static_cast<uint32_t>(priority),
+                                                                          extra, m_trustedDaemon);
+            } else {
+                transaction->m_pending_tx = m_wallet->create_transactions_all(addr, fake_outs_count, 0 /* unlock_time */,
+                                                                          static_cast<uint32_t>(priority),
+                                                                          extra, m_trustedDaemon);
+            }
 
         } catch (const tools::error::daemon_busy&) {
             // TODO: make it translatable with "tr"?

src/wallet/api/wallet.h

@@ -89,7 +89,7 @@ public:
 
 
     PendingTransaction * createTransaction(const std::string &dst_addr, const std::string &payment_id,
-                                        uint64_t amount, uint32_t mixin_count,
+                                        optional<uint64_t> amount, uint32_t mixin_count,
                                         PendingTransaction::Priority priority = PendingTransaction::Priority_Low);
     virtual PendingTransaction * createSweepUnmixableTransaction();
 

src/wallet/wallet2_api.h

@@ -41,6 +41,20 @@ namespace Bitmonero {
     namespace Utils {
         bool isAddressLocal(const std::string &hostaddr);
     }
+
+    template<typename T>
+    class optional {
+      public:
+        optional(): set(false) {}
+        optional(const T &t): t(t), set(true) {}
+        const T &operator*() const { return t; }
+        T &operator*() { return t; }
+        operator bool() const { return set; }
+      private:
+        T t;
+        bool set;
+    };
+
 /**
  * @brief Transaction-like interface for sending money
  */
@@ -332,7 +346,7 @@ struct Wallet
      */
 
     virtual PendingTransaction * createTransaction(const std::string &dst_addr, const std::string &payment_id,
-                                                   uint64_t amount, uint32_t mixin_count,
+                                                   optional<uint64_t> amount, uint32_t mixin_count,
                                                    PendingTransaction::Priority = PendingTransaction::Priority_Low) = 0;
 
     /*!