perf: speed up epoch statistic generator

shaojunda · Apr 30, 2020 · f3a059a · f3a059a
1 parent 2c40104
commit f3a059a
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/app/services/charts/epoch_statistic_generator.rb b/app/services/charts/epoch_statistic_generator.rb
@@ -11,8 +11,8 @@ def call
       uncles_count = Block.where(epoch: target_epoch_number).sum(:uncles_count)
       uncle_rate = uncles_count / blocks_count.to_d
       difficulty = Block.where(epoch: target_epoch_number).first.difficulty
-      first_block_in_epoch = Block.where(epoch: target_epoch_number).order(:number).first
-      last_lock_in_epoch = Block.where(epoch: target_epoch_number).order(:number).last
+      first_block_in_epoch = Block.where(epoch: target_epoch_number).order(:number).select(:timestamp)[0]
+      last_lock_in_epoch = Block.where(epoch: target_epoch_number).order(number: :desc).select(:timestamp)[0]
       epoch_time = last_lock_in_epoch.timestamp - first_block_in_epoch.timestamp
       epoch_length = Block.where(epoch: target_epoch_number).count
       hash_rate = difficulty * epoch_length / epoch_time