wallet2_api: implement estimateTransactionFee

3 files changed, 30 insertions, 0 deletions

diff --git a/src/wallet/api/wallet.cpp b/src/wallet/api/wallet.cpp
index 6200c7a1f..33047f703 100644
--- a/src/wallet/api/wallet.cpp
+++ b/src/wallet/api/wallet.cpp
@@ -1671,6 +1671,26 @@ void WalletImpl::disposeTransaction(PendingTransaction *t)
     delete t;
 }
 
+uint64_t WalletImpl::estimateTransactionFee(const std::vector<std::pair<std::string, uint64_t>> &destinations,
+                                            PendingTransaction::Priority priority) const
+{
+    const size_t pubkey_size = 33;
+    const size_t encrypted_paymentid_size = 11;
+    const size_t extra_size = pubkey_size + encrypted_paymentid_size;
+
+    return m_wallet->estimate_fee(
+        m_wallet->use_fork_rules(HF_VERSION_PER_BYTE_FEE, 0),
+        m_wallet->use_fork_rules(4, 0),
+        1,
+        m_wallet->get_min_ring_size() - 1,
+        destinations.size() + 1,
+        extra_size,
+        m_wallet->use_fork_rules(8, 0),
+        m_wallet->get_base_fee(),
+        m_wallet->get_fee_multiplier(m_wallet->adjust_priority(static_cast<uint32_t>(priority))),
+        m_wallet->get_fee_quantization_mask());
+}
+
 TransactionHistory *WalletImpl::history()
 {
     return m_history.get();
diff --git a/src/wallet/api/wallet.h b/src/wallet/api/wallet.h
index 331bf4b38..e46a62340 100644
--- a/src/wallet/api/wallet.h
+++ b/src/wallet/api/wallet.h
@@ -166,6 +166,8 @@ public:
     bool importKeyImages(const std::string &filename) override;
 
     virtual void disposeTransaction(PendingTransaction * t) override;
+    virtual uint64_t estimateTransactionFee(const std::vector<std::pair<std::string, uint64_t>> &destinations,
+                                            PendingTransaction::Priority priority) const override;
     virtual TransactionHistory * history() override;
     virtual AddressBook * addressBook() override;
     virtual Subaddress * subaddress() override;
diff --git a/src/wallet/api/wallet2_api.h b/src/wallet/api/wallet2_api.h
index e543a115b..3945e55c9 100644
--- a/src/wallet/api/wallet2_api.h
+++ b/src/wallet/api/wallet2_api.h
@@ -879,6 +879,14 @@ struct Wallet
      */
     virtual void disposeTransaction(PendingTransaction * t) = 0;
 
+    /*!
+     * \brief Estimates transaction fee.
+     * \param destinations Vector consisting of <address, amount> pairs.
+     * \return Estimated fee.
+     */
+    virtual uint64_t estimateTransactionFee(const std::vector<std::pair<std::string, uint64_t>> &destinations,
+                                            PendingTransaction::Priority priority) const = 0;
+
    /*!
     * \brief exportKeyImages - exports key images to file
     * \param filename