Support stateMutability=view to define reading functions in smart-contracts

CHANGELOG.md

@@ -7,6 +7,7 @@
 - [#2834](https://github.com/poanetwork/blockscout/pull/2834) - always redirect to checksummed hash
 
 ### Fixes
+- [#3034](https://github.com/poanetwork/blockscout/pull/3034) - Support stateMutability=view to define reading functions in smart-contracts
 - [#3029](https://github.com/poanetwork/blockscout/pull/3029) - Fix transactions and blocks appearance on the main page
 - [#3028](https://github.com/poanetwork/blockscout/pull/3028) - Decrease polling period value for realtime fetcher
 - [#3027](https://github.com/poanetwork/blockscout/pull/3027) - Rescue for SUPPORTED_CHAINS env var parsing

apps/block_scout_web/lib/block_scout_web/views/address_view.ex

@@ -206,7 +206,7 @@ defmodule BlockScoutWeb.AddressView do
   def smart_contract_verified?(%Address{smart_contract: nil}), do: false
 
   def smart_contract_with_read_only_functions?(%Address{smart_contract: %SmartContract{}} = address) do
-    Enum.any?(address.smart_contract.abi, & &1["constant"])
+    Enum.any?(address.smart_contract.abi, &(&1["constant"] || &1["stateMutability"] == "view"))
   end
 
   def smart_contract_with_read_only_functions?(%Address{smart_contract: nil}), do: false

apps/block_scout_web/lib/block_scout_web/views/tokens/instance/overview_view.ex

@@ -47,7 +47,7 @@ defmodule BlockScoutWeb.Tokens.Instance.OverviewView do
   def smart_contract_with_read_only_functions?(
         %Token{contract_address: %Address{smart_contract: %SmartContract{}}} = token
       ) do
-    Enum.any?(token.contract_address.smart_contract.abi, & &1["constant"])
+    Enum.any?(token.contract_address.smart_contract.abi, &(&1["constant"] || &1["stateMutability"] == "view"))
   end
 
   def smart_contract_with_read_only_functions?(%Token{contract_address: %Address{smart_contract: nil}}), do: false

apps/block_scout_web/lib/block_scout_web/views/tokens/overview_view.ex

@@ -43,7 +43,7 @@ defmodule BlockScoutWeb.Tokens.OverviewView do
   def smart_contract_with_read_only_functions?(
         %Token{contract_address: %Address{smart_contract: %SmartContract{}}} = token
       ) do
-    Enum.any?(token.contract_address.smart_contract.abi, & &1["constant"])
+    Enum.any?(token.contract_address.smart_contract.abi, &(&1["constant"] || &1["stateMutability"] == "view"))
   end
 
   def smart_contract_with_read_only_functions?(%Token{contract_address: %Address{smart_contract: nil}}), do: false

apps/explorer/lib/explorer/smart_contract/reader.ex

@@ -175,7 +175,7 @@ defmodule Explorer.SmartContract.Reader do
 
       _ ->
         abi
-        |> Enum.filter(& &1["constant"])
+        |> Enum.filter(&(&1["constant"] || &1["stateMutability"] == "view"))
         |> Enum.map(&fetch_current_value_from_blockchain(&1, abi, contract_address_hash))
     end
   end