1 files changed, 69 insertions, 0 deletions
diff --git a/src/rpc/rpc_handler.cpp b/src/rpc/rpc_handler.cpp
new file mode 100644
index 000000000..d4beb1928
--- /dev/null
+++ b/src/rpc/rpc_handler.cpp
@@ -0,0 +1,69 @@
+
+#include <algorithm>
+#include <boost/thread/locks.hpp>
+#include <boost/thread/mutex.hpp>
+
+#include "cryptonote_core/cryptonote_core.h"
+
+namespace cryptonote
+{
+namespace rpc
+{
+  namespace
+  {
+    output_distribution_data
+      process_distribution(bool cumulative, std::uint64_t start_height, std::vector<std::uint64_t> distribution, std::uint64_t base)
+    {
+      if (!cumulative && !distribution.empty())
+      {
+        for (std::size_t n = distribution.size() - 1; 0 < n; --n)
+          distribution[n] -= distribution[n - 1];
+        distribution[0] -= base;
+      }
+
+      return {std::move(distribution), start_height, base};
+    }
+  }
+
+  boost::optional<output_distribution_data>
+    RpcHandler::get_output_distribution(core& src, std::uint64_t amount, std::uint64_t from_height, std::uint64_t to_height, bool cumulative)
+  {
+      static struct D
+      {
+        boost::mutex mutex;
+        std::vector<std::uint64_t> cached_distribution;
+        std::uint64_t cached_from, cached_to, cached_start_height, cached_base;
+        bool cached;
+        D(): cached_from(0), cached_to(0), cached_start_height(0), cached_base(0), cached(false) {}
+      } d;
+      const boost::unique_lock<boost::mutex> lock(d.mutex);
+
+      if (d.cached && amount == 0 && d.cached_from == from_height && d.cached_to == to_height)
+        return process_distribution(cumulative, d.cached_start_height, d.cached_distribution, d.cached_base);
+
+      std::vector<std::uint64_t> distribution;
+      std::uint64_t start_height, base;
+      if (!src.get_output_distribution(amount, from_height, to_height, start_height, distribution, base))
+        return boost::none;
+
+      if (to_height > 0 && to_height >= from_height)
+      {
+        const std::uint64_t offset = std::max(from_height, start_height);
+        if (offset <= to_height && to_height - offset + 1 < distribution.size())
+          distribution.resize(to_height - offset + 1);
+      }
+
+      if (amount == 0)
+      {
+        d.cached_from = from_height;
+        d.cached_to = to_height;
+        d.cached_distribution = distribution;
+        d.cached_start_height = start_height;
+        d.cached_base = base;
+        d.cached = true;
+      }
+
+      return process_distribution(cumulative, start_height, std::move(distribution), base);
+  }
+} // rpc
+} // cryptonote