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, 134 insertions, 0 deletions

diff --git a/src/wallet/node_rpc_proxy.cpp b/src/wallet/node_rpc_proxy.cpp
new file mode 100644
index 000000000..d7f755e36
--- /dev/null
+++ b/src/wallet/node_rpc_proxy.cpp
@@ -0,0 +1,134 @@
+// 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.
+
+#include "node_rpc_proxy.h"
+#include "rpc/core_rpc_server_commands_defs.h"
+#include "common/json_util.h"
+#include "storages/http_abstract_invoke.h"
+
+using namespace epee;
+
+namespace tools
+{
+
+void NodeRPCProxy::init(const std::string &daemon_address)
+{
+  m_daemon_address = daemon_address;
+
+  m_height = 0;
+  m_height_time = 0;
+  for (auto &slot: m_earliest_height)
+    slot = 0;
+  m_dynamic_per_kb_fee_estimate = 0;
+  m_dynamic_per_kb_fee_estimate_cached_height = 0;
+  m_dynamic_per_kb_fee_estimate_grace_blocks = 0;
+}
+
+boost::optional<std::string> NodeRPCProxy::get_height(uint64_t &height)
+{
+  const time_t now = time(NULL);
+  if (m_height == 0 || now >= m_height_time + 30) // re-cache every 30 seconds
+  {
+    cryptonote::COMMAND_RPC_GET_HEIGHT::request req = AUTO_VAL_INIT(req);
+    cryptonote::COMMAND_RPC_GET_HEIGHT::response res = AUTO_VAL_INIT(res);
+
+    m_daemon_rpc_mutex.lock();
+    bool r = net_utils::invoke_http_json_remote_command2(m_daemon_address + "/getheight", req, res, m_http_client);
+    m_daemon_rpc_mutex.unlock();
+    CHECK_AND_ASSERT_MES(r, std::string(), "Failed to connect to daemon");
+    CHECK_AND_ASSERT_MES(res.status != CORE_RPC_STATUS_BUSY, res.status, "Failed to connect to daemon");
+    CHECK_AND_ASSERT_MES(res.status == CORE_RPC_STATUS_OK, res.status, "Failed to get current blockchain height");
+    m_height = res.height;
+    m_height_time = now;
+  }
+  height = m_height;
+  return boost::optional<std::string>();
+}
+
+void NodeRPCProxy::set_height(uint64_t h)
+{
+  m_height = h;
+}
+
+boost::optional<std::string> NodeRPCProxy::get_earliest_height(uint8_t version, uint64_t &earliest_height)
+{
+  if (m_earliest_height[version] == 0)
+  {
+    epee::json_rpc::request<cryptonote::COMMAND_RPC_HARD_FORK_INFO::request> req_t = AUTO_VAL_INIT(req_t);
+    epee::json_rpc::response<cryptonote::COMMAND_RPC_HARD_FORK_INFO::response, std::string> resp_t = AUTO_VAL_INIT(resp_t);
+
+    m_daemon_rpc_mutex.lock();
+    req_t.jsonrpc = "2.0";
+    req_t.id = epee::serialization::storage_entry(0);
+    req_t.method = "hard_fork_info";
+    req_t.params.version = version;
+    bool r = net_utils::invoke_http_json_remote_command2(m_daemon_address + "/json_rpc", req_t, resp_t, m_http_client);
+    m_daemon_rpc_mutex.unlock();
+    CHECK_AND_ASSERT_MES(r, std::string(), "Failed to connect to daemon");
+    CHECK_AND_ASSERT_MES(resp_t.result.status != CORE_RPC_STATUS_BUSY, resp_t.result.status, "Failed to connect to daemon");
+    CHECK_AND_ASSERT_MES(resp_t.result.status == CORE_RPC_STATUS_OK, resp_t.result.status, "Failed to get hard fork status");
+    m_earliest_height[version] = resp_t.result.earliest_height;
+  }
+
+  earliest_height = m_earliest_height[version];
+  return boost::optional<std::string>();
+}
+
+boost::optional<std::string> NodeRPCProxy::get_dynamic_per_kb_fee_estimate(uint64_t grace_blocks, uint64_t &fee)
+{
+  uint64_t height;
+
+  boost::optional<std::string> result = get_height(height);
+  if (result)
+    return result;
+
+  if (m_dynamic_per_kb_fee_estimate_cached_height != height || m_dynamic_per_kb_fee_estimate_grace_blocks != grace_blocks)
+  {
+    epee::json_rpc::request<cryptonote::COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE::request> req_t = AUTO_VAL_INIT(req_t);
+    epee::json_rpc::response<cryptonote::COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE::response, std::string> resp_t = AUTO_VAL_INIT(resp_t);
+
+    m_daemon_rpc_mutex.lock();
+    req_t.jsonrpc = "2.0";
+    req_t.id = epee::serialization::storage_entry(0);
+    req_t.method = "get_fee_estimate";
+    req_t.params.grace_blocks = grace_blocks;
+    bool r = net_utils::invoke_http_json_remote_command2(m_daemon_address + "/json_rpc", req_t, resp_t, m_http_client);
+    m_daemon_rpc_mutex.unlock();
+    CHECK_AND_ASSERT_MES(r, std::string(), "Failed to connect to daemon");
+    CHECK_AND_ASSERT_MES(resp_t.result.status != CORE_RPC_STATUS_BUSY, resp_t.result.status, "Failed to connect to daemon");
+    CHECK_AND_ASSERT_MES(resp_t.result.status == CORE_RPC_STATUS_OK, resp_t.result.status, "Failed to get fee estimate");
+    m_dynamic_per_kb_fee_estimate = resp_t.result.fee;
+    m_dynamic_per_kb_fee_estimate_cached_height = height;
+    m_dynamic_per_kb_fee_estimate_grace_blocks = grace_blocks;
+  }
+
+  fee = m_dynamic_per_kb_fee_estimate;
+  return boost::optional<std::string>();
+}
+
+}