Split eth_getLogs requests

apps/block_scout_web/lib/block_scout_web/channels/stakes_channel.ex

@@ -549,26 +549,40 @@ defmodule BlockScoutWeb.StakesChannel do
   end
 
   defp find_claim_reward_pools_by_logs(staking_contract_address, topics, json_rpc_named_arguments) do
+    latest_block = BlockNumber.get_max()
+    split_by = 500 # must be less than 1000
+
+    iterations = 0..trunc(ceil(latest_block / split_by) - 1)
+    Enum.reduce(iterations, {nil, []}, fn i, acc ->
+      {acc_error, acc_pools} = acc
+      if acc_error do
+        {acc_error, []}
+      else
+        from = i * split_by + 1
+        to = (i + 1) * split_by
+        to = if to > latest_block, do: latest_block, else: to
         result = EthereumJSONRPC.request(%{
           id: 0,
           method: "eth_getLogs",
           params: [%{
-        fromBlock: "0x0",
-        toBlock: "latest",
+            fromBlock: "0x" <> Integer.to_string(from, 16),
+            toBlock: "0x" <> Integer.to_string(to, 16),
             address: staking_contract_address,
             topics: topics
           }]
         }) |> EthereumJSONRPC.json_rpc(json_rpc_named_arguments)
         case result do
           {:ok, response} ->
-        pools = Enum.uniq(Enum.map(response, fn event -> 
+            pools = Enum.uniq(acc_pools ++ Enum.map(response, fn event -> 
               truncate_address(Enum.at(event["topics"], 1))
             end))
-        {nil, pools}
+            {acc_error, pools}
           {:error, reason} ->
             {error_reason_to_string(reason), []}
         end
       end
+    end)
+  end
 
   defp address_pad_to_64(address) do
     address