feat(server): add statistic info

server/.env

@@ -15,3 +15,4 @@ INAUTHENTICSYNC_LOOP_INTERVAL="1"
 TRANSACTION_UPDATER_LOOP_INTERVAL="30"
 CODE_HASH="0x28e83a1277d48add8e72fadaa9248559e1b632bab2bd60b27955ebc4c03800a5"
 INITIAL_BLOCK_REWARD="5_000_000_000_000"
+STATISTICAL_INTERVAL="500"

server/app/controllers/api/v1/statistics_controller.rb

@@ -2,7 +2,8 @@ module Api
   module V1
     class StatisticsController < ApplicationController
       def index
-
+        statistic_info = StatisticInfo.new
+        render json: IndexStatisticSerializer.new(statistic_info)
       end
     end
   end

server/app/models/statistic_info.rb

@@ -0,0 +1,31 @@
+class StatisticInfo
+  def initialize(difficulty_interval: nil, block_time_interval: nil, statistical_interval: nil)
+    @difficulty_interval = difficulty_interval.presence || ENV["STATISTICAL_INTERVAL"]
+    @block_time_interval = block_time_interval.presence || ENV["STATISTICAL_INTERVAL"]
+    @statistical_interval = statistical_interval.presence || ENV["STATISTICAL_INTERVAL"]
+  end
+
+  def id
+    Time.current.to_i
+  end
+
+  def tip_block_number
+
+  end
+
+  def average_difficulty
+
+  end
+
+  def average_block_time
+
+  end
+
+  def hash_rate
+
+  end
+
+  private
+
+  attr_reader :difficulty_interval, :block_time_interval, :statistical_interval
+end

server/app/serializers/index_statistic_serializer.rb

@@ -0,0 +1,5 @@
+class IndexStatisticSerializer
+  include FastJsonapi::ObjectSerializer
+
+  attributes :tip_block_number, :average_block_time, :average_difficulty, :hash_rate
+end