load blocks from cache in controller

apps/explorer/lib/explorer/chain.ex

@@ -32,6 +32,7 @@ defmodule Explorer.Chain do
     Block,
     BlockCountCache,
     BlockNumberCache,
+    BlocksCache,
     Data,
     DecompiledSmartContract,
     Hash,
@@ -1148,16 +1149,22 @@ defmodule Explorer.Chain do
   @spec list_blocks([paging_options | necessity_by_association_option]) :: [Block.t()]
   def list_blocks(options \\ []) when is_list(options) do
     necessity_by_association = Keyword.get(options, :necessity_by_association, %{})
-    paging_options = Keyword.get(options, :paging_options, @default_paging_options)
+    paging_options = Keyword.get(options, :paging_options) || @default_paging_options
     block_type = Keyword.get(options, :block_type, "Block")
 
-    Block
-    |> Block.block_type_filter(block_type)
-    |> page_blocks(paging_options)
-    |> limit(^paging_options.page_size)
-    |> order_by(desc: :number)
-    |> join_associations(necessity_by_association)
-    |> Repo.all()
+    if block_type == "Block" && !paging_options.key && BlocksCache.enough_elements?(paging_options.page_size) do
+      cached_blocks = BlocksCache.blocks()
+
+      Enum.slice(cached_blocks, 0, paging_options.page_size)
+    else
+      Block
+      |> Block.block_type_filter(block_type)
+      |> page_blocks(paging_options)
+      |> limit(^paging_options.page_size)
+      |> order_by(desc: :number)
+      |> join_associations(necessity_by_association)
+      |> Repo.all()
+    end
   end
 
   @doc """

apps/explorer/lib/explorer/chain/blocks_cache.ex

@@ -22,6 +22,16 @@ defmodule Explorer.Chain.BlocksCache do
     end
   end
 
+  def enough_elements?(number) do
+    ConCache.size(@cache_name) > number + 1
+  end
+
+  def update_blocks(blocks) do
+    Enum.each(blocks, fn block ->
+      update(block)
+    end)
+  end
+
   def blocks do
     numbers = block_numbers()
 

apps/indexer/lib/indexer/block/fetcher.ex

@@ -11,7 +11,7 @@ defmodule Indexer.Block.Fetcher do
 
   alias EthereumJSONRPC.{Blocks, FetchedBeneficiaries}
   alias Explorer.Chain
-  alias Explorer.Chain.{Address, Block, BlockNumberCache, Hash, Import, Transaction}
+  alias Explorer.Chain.{Address, Block, BlockNumberCache, BlocksCache, Hash, Import, Transaction}
   alias Indexer.Block.Fetcher.Receipts
 
   alias Indexer.Fetcher.{
@@ -186,6 +186,7 @@ defmodule Indexer.Block.Fetcher do
 
     BlockNumberCache.update(max_block.number)
     BlockNumberCache.update(min_block.number)
+    BlocksCache.update_blocks(blocks)
   end
 
   def import(