Support raw results in Ethers.call/2 (#137)

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+### Enhancements
+
+- Enable raw use of `Ethers.call/2` (usage without function selector)
+
 ## v0.5.1 (2024-08-02)
 
 ### Enhancements

lib/ethers.ex

@@ -667,17 +667,22 @@ defmodule Ethers do
 
   defp pre_process(data, [], _action, _opts), do: {:ok, data}
 
-  defp post_process({:ok, resp}, tx_data, :call) when valid_result(resp) do
-    tx_data.selector
+  defp post_process({:ok, resp}, %{selector: selector}, :call) when valid_result(resp) do
+    selector
     |> ABI.decode(Ethers.Utils.hex_decode!(resp), :output)
-    |> Enum.zip(tx_data.selector.returns)
+    |> Enum.zip(selector.returns)
     |> Enum.map(fn {return, type} -> Utils.human_arg(return, type) end)
     |> case do
       [element] -> {:ok, element}
       elements -> {:ok, elements}
     end
   end
 
+  defp post_process({:ok, resp}, _tx_data, :call) when is_binary(resp) do
+    # Handle the case that call was used without a selector (raw call)
+    {:ok, resp}
+  end
+
   defp post_process({:ok, tx_hash}, _tx_data, _action = :send) when valid_result(tx_hash),
     do: {:ok, tx_hash}
 

test/ethers_test.exs

@@ -599,4 +599,18 @@ defmodule EthersTest do
       end
     end
   end
+
+  describe "call/2" do
+    test "works without selector (raw call)" do
+      address = deploy(HelloWorldContract, from: @from)
+
+      tx_data = HelloWorldContract.say_hello()
+
+      assert {:ok,
+              "0x000000000000000000000000000000000000000000000000000000000000002000000000000" <>
+                "0000000000000000000000000000000000000000000000000000c48656c6c6f20576f726c642100" <>
+                "00000000000000000000000000000000000000"} =
+               Ethers.call(%{data: tx_data.data}, to: address)
+    end
+  end
 end