From 782b2f4a2dc277fb9d0615c05bd73e4ce75c3e92 Mon Sep 17 00:00:00 2001
From: Victor Baranov <baranov.viktor.27@gmail.com>
Date: Thu, 27 Aug 2020 19:50:48 +0300
Subject: [PATCH] Contract  interaction: array input type

---
 CHANGELOG.md                                  |  1 +
 .../lib/ethereum_jsonrpc/contract.ex          | 35 ++++++++++++++++++-
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f3b409eed..08e53ea93e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### Features
 
 ### Fixes
+- [#3259](https://github.com/poanetwork/blockscout/pull/3259) - Contract interaction: array input type parsing fix
 - [#3256](https://github.com/poanetwork/blockscout/pull/3256) - Fix for invisible validator address at block page and wrong alert text color at xDai
 
 ### Chore
diff --git a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/contract.ex b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/contract.ex
index 7276ce395d..8cec3a6356 100644
--- a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/contract.ex
+++ b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/contract.ex
@@ -44,8 +44,10 @@ defmodule EthereumJSONRPC.Contract do
             func.function == function_name && Enum.count(func.input_names) == Enum.count(args)
           end)
 
+        formatted_args = format_args(function, args)
+
         function
-        |> Encoder.encode_function_call(args)
+        |> Encoder.encode_function_call(formatted_args)
         |> eth_call_request(contract_address, index, Map.get(request, :block_number), Map.get(request, :from))
       end)
       |> json_rpc(json_rpc_named_arguments)
@@ -75,6 +77,37 @@ defmodule EthereumJSONRPC.Contract do
       Enum.map(requests, fn _ -> format_error(error) end)
   end
 
+  defp format_args(function, args) do
+    args
+    |> Enum.with_index()
+    |> Enum.map(fn {arg, index} ->
+      types = function.types
+
+      case Enum.at(types, index) do
+        {:array, {:int, _size}} ->
+          convert_string_to_array(arg)
+
+        {:array, {:uint, _size}} ->
+          convert_string_to_array(arg)
+
+        {:array, _} ->
+          String.split(arg, ",")
+
+        _ ->
+          arg
+      end
+    end)
+  end
+
+  defp convert_string_to_array(arg) do
+    arg
+    |> String.split(",")
+    |> Enum.map(fn el ->
+      {int, _} = Integer.parse(el)
+      int
+    end)
+  end
+
   def eth_call_request(data, contract_address, id, block_number, from) do
     block =
       case block_number do