wallet: add a node RPC cache layer for simple RPC calls

Mostly getinfo and get_hard_fork_info, which are called
pretty often. This speeds up transfers as a bonus.

1 files changed, 65 insertions, 0 deletions

diff --git a/src/wallet/node_rpc_proxy.h b/src/wallet/node_rpc_proxy.h
new file mode 100644
index 000000000..1ae716dab
--- /dev/null
+++ b/src/wallet/node_rpc_proxy.h
@@ -0,0 +1,65 @@
+// Copyright (c) 2017, 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.
+
+#pragma once
+
+#include <string>
+#include <boost/thread/mutex.hpp>
+#include "include_base_utils.h"
+#include "net/http_client.h"
+
+namespace tools
+{
+
+class NodeRPCProxy
+{
+public:
+  NodeRPCProxy(epee::net_utils::http::http_simple_client &http_client, boost::mutex &mutex):
+    m_http_client(http_client), m_daemon_rpc_mutex(mutex) { init(""); }
+
+  void init(const std::string &daemon_address);
+
+  boost::optional<std::string> get_height(uint64_t &height);
+  void set_height(uint64_t h);
+  boost::optional<std::string> get_earliest_height(uint8_t version, uint64_t &earliest_height);
+  boost::optional<std::string> get_dynamic_per_kb_fee_estimate(uint64_t grace_blocks, uint64_t &fee);
+
+private:
+  std::string m_daemon_address;
+  epee::net_utils::http::http_simple_client &m_http_client;
+  boost::mutex &m_daemon_rpc_mutex;
+
+  uint64_t m_height;
+  time_t m_height_time;
+  uint64_t m_earliest_height[256];
+  uint64_t m_dynamic_per_kb_fee_estimate;
+  uint64_t m_dynamic_per_kb_fee_estimate_cached_height;
+  uint64_t m_dynamic_per_kb_fee_estimate_grace_blocks;
+};
+
+}