block size and median size of blocks added

src/page.h

@@ -522,6 +522,8 @@ public:
         // previous blk timestamp, initalised to lowest possible value
         double prev_blk_timestamp {std::numeric_limits<double>::lowest()};
 
+        vector<double> blk_sizes;
+
         // iterate over last no_of_last_blocks of blocks
         for (uint64_t i = start_height; i <= end_height; ++i)
         {
@@ -537,11 +539,17 @@ public:
             // get block's hash
             crypto::hash blk_hash = core_storage->get_block_id_by_height(i);
 
+            // get block size in kB
+            double blk_size = static_cast<double>(core_storage->get_db().get_block_size(i))/1024.0;
+
+            string blk_size_str = fmt::format("{:0.2f}", blk_size);
+
+            blk_sizes.push_back(blk_size);
+
             // remove "<" and ">" from the hash string
             string blk_hash_str = REMOVE_HASH_BRAKETS(fmt::format("{:s}", blk_hash));
 
             // get block age
-
             pair<string, string> age = get_age(server_timestamp, blk.timestamp);
 
             context["age_format"] = age.second;
@@ -585,6 +593,7 @@ public:
                 txd_map.insert({"age"       , age.first});
                 txd_map.insert({"is_ringct" , (tx.version > 1)});
                 txd_map.insert({"rct_type"  , tx.rct_signatures.type});
+                txd_map.insert({"blk_size"  , blk_size_str});
 
 
                 // do not show block info for other than
@@ -595,6 +604,7 @@ public:
                     txd_map["height"]     = string("");
                     txd_map["age"]        = string("");
                     txd_map["time_delta"] = string("");
+                    txd_map["blk_size"]   = string("");
                 }
 
                 txs.push_back(txd_map);
@@ -607,18 +617,16 @@ public:
 
         } // for (uint64_t i = start_height; i <= end_height; ++i)
 
+        // calculate median size of the blocks shown
+        double blk_size_median = xmreg::calc_median(blk_sizes.begin(), blk_sizes.end());
+
+        context["blk_size_median"] = fmt::format("{:0.2f}", blk_size_median);
+
         // reverse txs and remove last (i.e., oldest)
         // tx. This is done so that time delats
         // are easier to calcualte in the above for loop
         std::reverse(txs.begin(), txs.end());
 
-        // if we look at the genesis time, we should not remove
-        // the last block, i.e. genesis one.
-        if (!(start_height < 2))
-        {
-          //txs.pop_back();
-        }
-
         // get memory pool rendered template
         string mempool_html = mempool();
 

src/templates/index2.html

@@ -23,30 +23,36 @@
     {{{mempool_info}}}
 
     {{#is_page_zero}}
-      <h2>Transactions in the last 25 blocks</h2>
+      <h2 style="margin-bottom: 0px">Transactions in the last 25 blocks</h2>
     {{/is_page_zero}}
     {{^is_page_zero}}
-      <h2>Transactions in older blocks<!--(height: {{height}})--></h2>
+      <h2 style="margin-bottom: 0px">Transactions in older blocks<!--(height: {{height}})--></h2>
     {{/is_page_zero}}
 
+    <h4 style="font-size: 14px; margin-top: 0px">(Median size of these blocks: {{blk_size_median}} kB)</h4>
+
+
+
     <div class="center">
 
             <table class="center">
                 <tr>
                     <td>height</td>
                     <td>age {{age_format}}<!--(Δm)--></td>
+                    <td>size [kB]<!--(Δm)--></td>
                     <td>tx hash</td>
                     <td>fees</td>
                     <td>outputs</td>
                     <td>in/out</td>
                     <td>rct/type</td>
                     <td>mixin</td>
-                    <td>size [kB]</td>
+                    <td>tx size [kB]</td>
                 </tr>
                 {{#txs}}
                 <tr>
                     <td><a href="/block/{{height}}">{{height}}</a></td>
                     <td>{{age}}<!--{{time_delta}}--></td>
+                    <td>{{blk_size}}</td>
                     <td><a href="/tx/{{hash}}">{{hash}}</a></td>
                     <td>{{tx_fee_short}}</td>
                     <td>{{sum_outputs_short}}</td>

src/tools.cpp

@@ -1332,5 +1332,6 @@ get_human_readable_timestamp(uint64_t ts)
 }
 
 
+
 }
 

src/tools.h

@@ -30,6 +30,8 @@
 #include <string>
 #include <vector>
 #include <array>
+#include <iterator>
+#include <algorithm>
 
 /**
  * Some helper functions used in the example.
@@ -302,6 +304,20 @@ make_printable(const string& in_s);
 string
 get_human_readable_timestamp(uint64_t ts);
 
+// Get the median of an unordered set of numbers of arbitrary
+// type without modifying the underlying dataset.
+// taken from http://stackoverflow.com/a/19695285
+template <typename It>
+typename std::iterator_traits<It>::value_type
+calc_median(It it_begin, It it_end)
+{
+    using T = typename std::iterator_traits<It>::value_type;
+    std::vector<T> data(it_begin, it_end);
+    std::nth_element(data.begin(), data.begin() + data.size() / 2, data.end());
+    return data[data.size() / 2];
+}
+
+
 }
 
 #endif //XMREG01_TOOLS_H