Ignore burn address token balance for Tokens ERC-721

As we always get errors trying to fetch token balances when the address
is the burn addres for Tokens ERC-721, we are gonna ignore them when we
are processing the token balances from the token transfer.

apps/indexer/lib/indexer/address/token_balances.ex

@@ -8,7 +8,9 @@ defmodule Indexer.Address.TokenBalances do
   end
 
   defp reducer({:token_transfers_params, token_transfers_params}, initial) when is_list(token_transfers_params) do
-    Enum.reduce(token_transfers_params, initial, fn %{
+    token_transfers_params
+    |> ignore_burn_address_transfers_for_token_erc_721
+    |> Enum.reduce(initial, fn %{
                                  block_number: block_number,
                                  from_address_hash: from_address_hash,
                                  to_address_hash: to_address_hash,
@@ -16,8 +18,7 @@ defmodule Indexer.Address.TokenBalances do
                                },
                                acc
                                when is_integer(block_number) and is_binary(from_address_hash) and
-                                                           is_binary(to_address_hash) and
-                                                           is_binary(token_contract_address_hash) ->
+                                      is_binary(to_address_hash) and is_binary(token_contract_address_hash) ->
       acc
       |> MapSet.put(%{
         address_hash: from_address_hash,
@@ -36,4 +37,20 @@ defmodule Indexer.Address.TokenBalances do
       })
     end)
   end
+
+  defp ignore_burn_address_transfers_for_token_erc_721(token_transfers_params) do
+    Enum.filter(token_transfers_params, &do_filter_burn_address/1)
+  end
+
+  def do_filter_burn_address(%{from_address_hash: "0x0000000000000000000000000000000000000000", token_type: "ERC-721"}) do
+    false
+  end
+
+  def do_filter_burn_address(%{to_address_hash: "0x0000000000000000000000000000000000000000", token_type: "ERC-721"}) do
+    false
+  end
+
+  def do_filter_burn_address(_token_balance_param) do
+    true
+  end
 end

apps/indexer/lib/indexer/token_transfers.ex

@@ -44,7 +44,8 @@ defmodule Indexer.TokenTransfers do
       from_address_hash: truncate_address_hash(log.second_topic),
       to_address_hash: truncate_address_hash(log.third_topic),
       token_contract_address_hash: log.address_hash,
-      transaction_hash: log.transaction_hash
+      transaction_hash: log.transaction_hash,
+      token_type: "ERC-20"
     }
 
     token = %{
@@ -67,7 +68,8 @@ defmodule Indexer.TokenTransfers do
       to_address_hash: truncate_address_hash(log.third_topic),
       token_contract_address_hash: log.address_hash,
       token_id: token_id || 0,
-      transaction_hash: log.transaction_hash
+      transaction_hash: log.transaction_hash,
+      token_type: "ERC-721"
     }
 
     token = %{
@@ -90,7 +92,8 @@ defmodule Indexer.TokenTransfers do
       to_address_hash: encode_address_hash(to_address_hash),
       token_contract_address_hash: log.address_hash,
       token_id: token_id,
-      transaction_hash: log.transaction_hash
+      transaction_hash: log.transaction_hash,
+      token_type: "ERC-721"
     }
 
     token = %{

apps/indexer/test/indexer/address/token_balances_test.exs

@@ -34,5 +34,43 @@ defmodule Indexer.Address.TokenBalancesTest do
       assert %{address_hash: to_address_hash, block_number: block_number}
       assert %{address_hash: token_contract_address_hash, block_number: block_number}
     end
+
+    test "does not set params when the from_address_hash is the burn address for the Token ERC-721" do
+      block_number = 1
+      from_address_hash = "0x0000000000000000000000000000000000000000"
+      to_address_hash = "0x5b8410f67eb8040bb1cd1e8a4ff9d5f6ce678a15"
+      token_contract_address_hash = "0xe18035bf8712672935fdb4e5e431b1a0183d2dfc"
+
+      token_transfer_params = %{
+        block_number: block_number,
+        from_address_hash: from_address_hash,
+        to_address_hash: to_address_hash,
+        token_contract_address_hash: token_contract_address_hash,
+        token_type: "ERC-721"
+      }
+
+      params_set = TokenBalances.params_set(%{token_transfers_params: [token_transfer_params]})
+
+      assert MapSet.size(params_set) == 0
+    end
+
+    test "does not set params when the to_address_hash is the burn address for the Token ERC-721" do
+      block_number = 1
+      from_address_hash = "0x5b8410f67eb8040bb1cd1e8a4ff9d5f6ce678a15"
+      to_address_hash = "0x0000000000000000000000000000000000000000"
+      token_contract_address_hash = "0xe18035bf8712672935fdb4e5e431b1a0183d2dfc"
+
+      token_transfer_params = %{
+        block_number: block_number,
+        from_address_hash: from_address_hash,
+        to_address_hash: to_address_hash,
+        token_contract_address_hash: token_contract_address_hash,
+        token_type: "ERC-721"
+      }
+
+      params_set = TokenBalances.params_set(%{token_transfers_params: [token_transfer_params]})
+
+      assert MapSet.size(params_set) == 0
+    end
   end
 end

apps/indexer/test/indexer/token_transfers_test.exs

@@ -66,7 +66,8 @@ defmodule Indexer.TokenTransfersTest do
             to_address_hash: truncated_hash(log_3.third_topic),
             token_contract_address_hash: log_3.address_hash,
             token_id: 183,
-            transaction_hash: log_3.transaction_hash
+            transaction_hash: log_3.transaction_hash,
+            token_type: "ERC-721"
           },
           %{
             amount: Decimal.new(17_000_000_000_000_000_000),
@@ -75,7 +76,8 @@ defmodule Indexer.TokenTransfersTest do
             from_address_hash: truncated_hash(log_1.second_topic),
             to_address_hash: truncated_hash(log_1.third_topic),
             token_contract_address_hash: log_1.address_hash,
-            transaction_hash: log_1.transaction_hash
+            transaction_hash: log_1.transaction_hash,
+            token_type: "ERC-20"
           }
         ]
       }
@@ -113,7 +115,8 @@ defmodule Indexer.TokenTransfersTest do
             to_address_hash: "0xbe8cdfc13ffda20c844ac3da2b53a23ac5787f1e",
             token_contract_address_hash: log.address_hash,
             token_id: 14_939,
-            transaction_hash: log.transaction_hash
+            transaction_hash: log.transaction_hash,
+            token_type: "ERC-721"
           }
         ]
       }