New interactive daemon command 'print_net_stats': Global traffic stats

src/common/util.cpp

@@ -80,6 +80,7 @@ using namespace epee;
 #include <boost/filesystem.hpp>
 #include <boost/algorithm/string.hpp>
 #include <boost/asio.hpp>
+#include <boost/format.hpp>
 #include <openssl/sha.h>
 
 #undef MONERO_DEFAULT_LOG_CATEGORY
@@ -1063,4 +1064,39 @@ std::string get_nix_version_display_string()
     strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", &tm);
     return std::string(buffer);
   }
+
+  std::string get_human_readable_bytes(uint64_t bytes)
+  {
+    // Use 1024 for "kilo", 1024*1024 for "mega" and so on instead of the more modern and standard-conforming
+    // 1000, 1000*1000 and so on, to be consistent with other Monero code that also uses base 2 units
+    struct byte_map
+    {
+        const char* const format;
+        const std::uint64_t bytes;
+    };
+
+    static constexpr const byte_map sizes[] =
+    {
+        {"%.0f B", 1024},
+        {"%.2f KB", 1024 * 1024},
+        {"%.2f MB", std::uint64_t(1024) * 1024 * 1024},
+        {"%.2f GB", std::uint64_t(1024) * 1024 * 1024 * 1024},
+        {"%.2f TB", std::uint64_t(1024) * 1024 * 1024 * 1024 * 1024}
+    };
+
+    struct bytes_less
+    {
+        bool operator()(const byte_map& lhs, const byte_map& rhs) const noexcept
+        {
+            return lhs.bytes < rhs.bytes;
+        }
+    };
+
+    const auto size = std::upper_bound(
+        std::begin(sizes), std::end(sizes) - 1, byte_map{"", bytes}, bytes_less{}
+    );
+    const std::uint64_t divisor = size->bytes / 1024;
+    return (boost::format(size->format) % (double(bytes) / divisor)).str();
+  }
+
 }

src/common/util.h

@@ -244,4 +244,6 @@ namespace tools
   void closefrom(int fd);
 
   std::string get_human_readable_timestamp(uint64_t ts);
+
+  std::string get_human_readable_bytes(uint64_t bytes);
 }