Merge pull request #4535 from blockscout/vb-tt-updater-fix

Indexer performance update: Eliminate multiple updates of the same token while parsing mint/burn token transfers batch

CHANGELOG.md

@@ -8,6 +8,7 @@
 - [#4452](https://github.com/blockscout/blockscout/pull/4452) - Add names for smart-conrtact's function response
 
 ### Fixes
+- [#4535](https://github.com/blockscout/blockscout/pull/4535) - Indexer performance update:: Eliminate multiple updates of the same token while parsing mint/burn token transfers batch
 - [#4527](https://github.com/blockscout/blockscout/pull/4527) - Indexer performance update: refactor coin balance daily fetcher
 - [#4525](https://github.com/blockscout/blockscout/pull/4525) - Uncataloged token transfers query performance improvement
 - [#4513](https://github.com/blockscout/blockscout/pull/4513) - Fix installation with custom default path: add NETWORK_PATH variable to the current_path

apps/indexer/lib/indexer/transform/token_transfers.ex

@@ -18,9 +18,24 @@ defmodule Indexer.Transform.TokenTransfers do
   def parse(logs) do
     initial_acc = %{tokens: [], token_transfers: []}
 
+    token_transfers_from_logs =
       logs
       |> Enum.filter(&(&1.first_topic == unquote(TokenTransfer.constant())))
       |> Enum.reduce(initial_acc, &do_parse/2)
+
+    token_transfers = token_transfers_from_logs.token_transfers
+
+    token_transfers
+    |> Enum.filter(fn token_transfer ->
+      token_transfer.to_address_hash == @burn_address || token_transfer.from_address_hash == @burn_address
+    end)
+    |> Enum.map(fn token_transfer ->
+      token_transfer.token_contract_address_hash
+    end)
+    |> Enum.dedup()
+    |> Enum.each(&update_token/1)
+
+    token_transfers_from_logs
   end
 
   defp do_parse(log, %{tokens: tokens, token_transfers: token_transfers} = acc) do
@@ -58,8 +73,6 @@ defmodule Indexer.Transform.TokenTransfers do
       type: "ERC-20"
     }
 
-    update_token(log.address_hash, token_transfer)
-
     {token, token_transfer}
   end
 
@@ -85,8 +98,6 @@ defmodule Indexer.Transform.TokenTransfers do
       type: "ERC-721"
     }
 
-    update_token(log.address_hash, token_transfer)
-
     {token, token_transfer}
   end
 
@@ -112,13 +123,12 @@ defmodule Indexer.Transform.TokenTransfers do
       type: "ERC-721"
     }
 
-    update_token(log.address_hash, token_transfer)
-
     {token, token_transfer}
   end
 
-  defp update_token(address_hash_string, token_transfer) do
-    if token_transfer.to_address_hash == @burn_address || token_transfer.from_address_hash == @burn_address do
+  defp update_token(nil), do: :ok
+
+  defp update_token(address_hash_string) do
     {:ok, address_hash} = Chain.string_to_address_hash(address_hash_string)
 
     token_params =
@@ -134,7 +144,6 @@ defmodule Indexer.Transform.TokenTransfers do
 
       {:ok, _} = Chain.update_token(%{token_to_update | updated_at: DateTime.utc_now()}, token_params)
     end
-    end
 
     :ok
   end