Initial base set of code

This is far from complete, but has the basic structure and concepts
implemented. The remainder is just fill in the blanks, and testing.

src/transaction_info.cpp

@@ -0,0 +1,79 @@
+// Copyright (c) 2024, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "transaction_info.h"
+
+#include "hex.h"
+
+namespace
+{  
+  struct payment_id_to_hex
+  {
+    template<typename T>
+    std::string operator()(const T& source) const
+    {
+      return epee::to_hex::string(epee::as_byte_span(source));
+    }
+
+    std::string operator()(const std::nullptr_t) const { return {}; }
+  };
+}
+
+namespace lwsf { namespace internal
+{
+  transaction_info::transaction_info(std::shared_ptr<backend::wallet> wallet, std::shared_ptr<backend::transaction> data)
+    : wallet_(std::move(wallet)), data_(std::move(data)), transfers_()
+  {
+    if (!wallet_ || !data_)
+      throw std::logic_error{"internal::transaction_info cannot be given nullptr"};
+
+    transfers_.reserve(data_->spends.size());
+    for (const auto& spend : data_->spends)
+      transfers_.emplace_back(spend.amount, spend.address);
+  }
+
+  transaction_info::~transaction_info()
+  {}
+
+  uint64_t transaction_info::confirmations() const
+  {
+    const auto block_height = blockHeight();
+    const boost::lock_guard<boost::mutex> lock{wallet_->sync};
+    return std::max(wallet_->blockchain_height, block_height) - block_height;
+  }
+
+  std::string transaction_info::hash() const
+  {
+    return epee::to_hex::string(epee::as_byte_span(data_->id));
+  }
+
+  std::string transaction_info::paymentId() const
+  {
+    return std::visit(payment_id_to_hex{}, data_->payment_id);
+  }
+}} // lwsf // internal