refactor: endpoint to return boolean result

apps/omg_watcher/lib/omg_watcher/block_validator.ex

@@ -26,11 +26,11 @@ defmodule OMG.Watcher.BlockValidator do
   - Verifies that transactions are correctly formed.
   - Verifies that given Merkle root matches reconstructed Merkle root.
   """
-  @spec stateless_validate(Block.t()) :: {:ok, Block.t()} | {:error, atom()}
+  @spec stateless_validate(Block.t()) :: {:ok, boolean()} | {:error, atom()}
   def stateless_validate(submitted_block) do
     with {:ok, recovered_transactions} <- verify_transactions(submitted_block.transactions),
-         {:ok, block} <- verify_merkle_root(submitted_block, recovered_transactions) do
-      {:ok, block}
+         {:ok, _block} <- verify_merkle_root(submitted_block, recovered_transactions) do
+      {:ok, true}
     end
   end
 

apps/omg_watcher/test/omg_watcher/block_validator_test.exs

@@ -83,7 +83,7 @@ defmodule OMG.WatcherRPC.Web.Validator.BlockValidatorTest do
         transactions: [signed_txbytes_1, signed_txbytes_2]
       }
 
-      assert {:ok, block} == BlockValidator.stateless_validate(block)
+      assert {:ok, true} == BlockValidator.stateless_validate(block)
     end
 
     test "returns error for non-matching Merkle root hash" do
@@ -118,7 +118,7 @@ defmodule OMG.WatcherRPC.Web.Validator.BlockValidatorTest do
         transactions: signed_txbytes
       }
 
-      assert {:ok, block} = BlockValidator.stateless_validate(block)
+      assert {:ok, true} = BlockValidator.stateless_validate(block)
     end
   end
 end

apps/omg_watcher_rpc/lib/web/controllers/block.ex

@@ -49,9 +49,14 @@ defmodule OMG.WatcherRPC.Web.Controller.Block do
   Executes stateful and stateless validation of a block.
   """
   def validate_block(conn, params) do
-    with {:ok, block} <- Validator.BlockConstraints.parse_to_validate(params),
-         {:ok, _block} <- Watcher.BlockValidator.stateless_validate(block) do
-      api_response(block, conn, :validate_block)
+    with {:ok, block} <- Validator.BlockConstraints.parse_to_validate(params) do
+      case Watcher.BlockValidator.stateless_validate(block) do
+        {:ok, true} ->
+          api_response(%{valid: true}, conn, :validate_block)
+
+        {:error, reason} ->
+          api_response(%{valid: false, error: reason}, conn, :validate_block)
+      end
     end
   end
 end

apps/omg_watcher_rpc/test/omg_watcher_rpc/web/controllers/block_test.exs

@@ -197,9 +197,8 @@ defmodule OMG.WatcherRPC.Web.Controller.BlockTest do
       %{"data" => data} = WatcherHelper.rpc_call("block.validate", params, 200)
 
       assert data == %{
-               "code" => "block.validate:invalid_merkle_root",
-               "description" => "Block hash does not match reconstructed Merkle root.",
-               "object" => "error"
+               "valid" => false,
+               "error" => "invalid_merkle_root"
              }
     end
 
@@ -245,9 +244,8 @@ defmodule OMG.WatcherRPC.Web.Controller.BlockTest do
       %{"data" => data} = WatcherHelper.rpc_call("block.validate", params, 200)
 
       assert data == %{
-               "code" => "validate_block:duplicate_inputs",
-               "description" => nil,
-               "object" => "error"
+               "error" => "duplicate_inputs",
+               "valid" => false
              }
     end
 
@@ -278,11 +276,7 @@ defmodule OMG.WatcherRPC.Web.Controller.BlockTest do
 
       %{"data" => data} = WatcherHelper.rpc_call("block.validate", params, 200)
 
-      assert data == %{
-               "hash" => params.hash,
-               "number" => params.number,
-               "transactions" => params.transactions
-             }
+      assert data == %{"valid" => true}
     end
   end
 end