Add a is_key_image_spent daemon command and RPC call

src/daemon/command_parser_executor.cpp

@@ -180,6 +180,26 @@ bool t_command_parser_executor::print_transaction(const std::vector<std::string>
   return true;
 }
 
+bool t_command_parser_executor::is_key_image_spent(const std::vector<std::string>& args)
+{
+  if (args.empty())
+  {
+    std::cout << "expected: is_key_image_spent <key_image>" << std::endl;
+    return true;
+  }
+
+  const std::string& str = args.front();
+  crypto::key_image ki;
+  crypto::hash hash;
+  if (parse_hash256(str, hash))
+  {
+    memcpy(&ki, &hash, sizeof(ki));
+    m_executor.is_key_image_spent(ki);
+  }
+
+  return true;
+}
+
 bool t_command_parser_executor::print_transaction_pool_long(const std::vector<std::string>& args)
 {
   if (!args.empty()) return false;

src/daemon/command_parser_executor.h

@@ -75,6 +75,8 @@ public:
 
   bool print_transaction(const std::vector<std::string>& args);
 
+  bool is_key_image_spent(const std::vector<std::string>& args);
+
   bool print_transaction_pool_long(const std::vector<std::string>& args);
 
   bool print_transaction_pool_short(const std::vector<std::string>& args);

src/daemon/command_server.cpp

@@ -84,6 +84,11 @@ t_command_server::t_command_server(
     , std::bind(&t_command_parser_executor::print_transaction, &m_parser, p::_1)
     , "Print transaction, print_tx <transaction_hash>"
     );
+  m_command_lookup.set_handler(
+      "is_key_image_spent"
+    , std::bind(&t_command_parser_executor::is_key_image_spent, &m_parser, p::_1)
+    , "Prints whether a given key image is in the spent key images set, is_key_image_spent <key_image>"
+    );
   m_command_lookup.set_handler(
       "start_mining"
     , std::bind(&t_command_parser_executor::start_mining, &m_parser, p::_1)

src/daemon/rpc_command_executor.cpp

@@ -520,6 +520,42 @@ bool t_rpc_command_executor::print_transaction(crypto::hash transaction_hash) {
   return true;
 }
 
+bool t_rpc_command_executor::is_key_image_spent(const crypto::key_image &ki) {
+  cryptonote::COMMAND_RPC_IS_KEY_IMAGE_SPENT::request req;
+  cryptonote::COMMAND_RPC_IS_KEY_IMAGE_SPENT::response res;
+
+  std::string fail_message = "Problem checkking key image";
+
+  req.key_images.push_back(epee::string_tools::pod_to_hex(ki));
+  if (m_is_rpc)
+  {
+    if (!m_rpc_client->rpc_request(req, res, "/is_key_image_spent", fail_message.c_str()))
+    {
+      return true;
+    }
+  }
+  else
+  {
+    if (!m_rpc_server->on_is_key_image_spent(req, res))
+    {
+      tools::fail_msg_writer() << fail_message.c_str();
+      return true;
+    }
+  }
+
+  if (1 == res.spent_status.size())
+  {
+    // first as hex
+    tools::success_msg_writer() << ki << ": " << (res.spent_status.front() ? "spent" : "unspent");
+  }
+  else
+  {
+    tools::fail_msg_writer() << "key image status could not be determined" << std::endl;
+  }
+
+  return true;
+}
+
 bool t_rpc_command_executor::print_transaction_pool_long() {
   cryptonote::COMMAND_RPC_GET_TRANSACTION_POOL::request req;
   cryptonote::COMMAND_RPC_GET_TRANSACTION_POOL::response res;

src/daemon/rpc_command_executor.h

@@ -87,6 +87,8 @@ public:
 
   bool print_transaction(crypto::hash transaction_hash);
 
+  bool is_key_image_spent(const crypto::key_image &ki);
+
   bool print_transaction_pool_long();
 
   bool print_transaction_pool_short();