Add tx_hash to returning tuple at contract's deployment

lib/exw3.ex

@@ -493,11 +493,11 @@ defmodule ExW3 do
         gas: "0x#{gas}"
       }
 
-      {:ok, tx_receipt_id} = Ethereumex.HttpClient.eth_send_transaction(tx)
+      {:ok, tx_hash} = Ethereumex.HttpClient.eth_send_transaction(tx)
 
-      {:ok, tx_receipt} = Ethereumex.HttpClient.eth_get_transaction_receipt(tx_receipt_id)
+      {:ok, tx_receipt} = Ethereumex.HttpClient.eth_get_transaction_receipt(tx_hash)
 
-      tx_receipt["contractAddress"]
+      {tx_receipt["contractAddress"], tx_hash}
     end
 
     def eth_call_helper(address, abi, method_name, args) do
@@ -526,6 +526,15 @@ defmodule ExW3 do
       )
     end
 
+
+    # Options' checkers
+
+    defp check_option(nil, error_atom), do: {:error, error_atom}
+    defp check_option([], error_atom), do: {:error, error_atom}
+    defp check_option([head | tail], atom) when head != nil,  do: {:ok, head}
+    defp check_option([_head | tail], atom), do: check_option(tail, atom)
+    defp check_option(value, _atom), do: {:ok, value}
+
     # Casts
 
     def handle_cast({:at, address}, state) do
@@ -547,11 +556,14 @@ defmodule ExW3 do
     # Calls
 
     def handle_call({:deploy, args}, _from, state) do
-      case {args[:bin], state[:bin]} do
-        {nil, nil} -> {:reply, {:error, "contract binary was never provided"}, state}
-        {bin, nil} -> {:reply, {:ok, deploy_helper(bin, state[:abi], args)}, state}
-        {nil, bin} -> {:reply, {:ok, deploy_helper(bin, state[:abi], args)}, state}
-      end
+      with {:ok, bin} <- check_option([state[:bin], args[:bin]], :missing_binary)
+       do
+        {contract_addr, tx_hash} = deploy_helper(bin, state[:abi], args)
+         result = {:ok, contract_addr, tx_hash}
+        {:reply, result , state}
+       else
+         err -> {:reply, err, state}
+       end
     end
 
     def handle_call(:address, _from, state) do

test/exw3_test.exs

@@ -60,7 +60,7 @@ defmodule EXW3Test do
   test "starts a Contract GenServer for simple storage contract", context do
     ExW3.Contract.start_link(SimpleStorage, abi: context[:simple_storage_abi])
 
-    {:ok, address} =
+    {:ok, address, _} =
       ExW3.Contract.deploy(
         SimpleStorage,
         bin: ExW3.load_bin("test/examples/build/SimpleStorage.bin"),
@@ -89,7 +89,7 @@ defmodule EXW3Test do
   test "starts a Contract GenServer for array tester contract", context do
     ExW3.Contract.start_link(ArrayTester, abi: context[:array_tester_abi])
 
-    {:ok, address} =
+    {:ok, address, _} =
       ExW3.Contract.deploy(
         ArrayTester,
         bin: ExW3.load_bin("test/examples/build/ArrayTester.bin"),
@@ -117,7 +117,7 @@ defmodule EXW3Test do
   test "starts a Contract GenServer for event tester contract", context do
     ExW3.Contract.start_link(EventTester, abi: context[:event_tester_abi])
 
-    {:ok, address} =
+    {:ok, address, _} =
       ExW3.Contract.deploy(
         EventTester,
         bin: ExW3.load_bin("test/examples/build/EventTester.bin"),
@@ -153,7 +153,7 @@ defmodule EXW3Test do
   test "starts a Contract GenServer and uses the event listener", context do
     ExW3.Contract.start_link(EventTester, abi: context[:event_tester_abi])
 
-    {:ok, address} =
+    {:ok, address, _} =
       ExW3.Contract.deploy(
         EventTester,
         bin: ExW3.load_bin("test/examples/build/EventTester.bin"),
@@ -200,7 +200,7 @@ defmodule EXW3Test do
   test "starts a Contract GenServer for Complex contract", context do
     ExW3.Contract.start_link(Complex, abi: context[:complex_abi])
 
-    {:ok, address} =
+    {:ok, address, _} =
       ExW3.Contract.deploy(
         Complex,
         bin: ExW3.load_bin("test/examples/build/Complex.bin"),
@@ -225,7 +225,7 @@ defmodule EXW3Test do
   test "starts a Contract GenServer for AddressTester contract", context do
     ExW3.Contract.start_link(AddressTester, abi: context[:address_tester_abi])
 
-    {:ok, address} =
+    {:ok, address, _} =
       ExW3.Contract.deploy(
         AddressTester,
         bin: ExW3.load_bin("test/examples/build/AddressTester.bin"),