allow to search by token symbol

apps/block_scout_web/lib/block_scout_web/chain.ex

@@ -11,7 +11,8 @@ defmodule BlockScoutWeb.Chain do
       number_to_block: 1,
       string_to_address_hash: 1,
       string_to_block_hash: 1,
-      string_to_transaction_hash: 1
+      string_to_transaction_hash: 1,
+      token_contract_address_from_token_name: 1
     ]
 
   alias Explorer.Chain.Block.Reward
@@ -67,10 +68,10 @@ defmodule BlockScoutWeb.Chain do
     end
   end
 
-  def from_param(formatted_number) when is_binary(formatted_number) do
+  def from_param(string) when is_binary(string) do
-    case param_to_block_number(formatted_number) do
+    case param_to_block_number(string) do
       {:ok, number} -> number_to_block(number)
-      {:error, :invalid} -> {:error, :not_found}
+      _ -> token_address_from_name(string)
     end
   end
 
@@ -159,6 +160,13 @@ defmodule BlockScoutWeb.Chain do
     end
   end
 
+  defp token_address_from_name(name) do
+    case token_contract_address_from_token_name(name) do
+      {:ok, hash} -> find_or_insert_address_from_hash(hash)
+      _ -> {:error, :not_found}
+    end
+  end
+
   defp paging_params({%Reward{block: %{number: number}}, _}) do
     %{"block_number" => number, "index" => 0}
   end

apps/block_scout_web/lib/block_scout_web/templates/layout/_topnav.html.eex

@@ -80,7 +80,7 @@
       <div class="search-form d-lg-flex d-inline-block">
         <%= form_for @conn, chain_path(@conn, :search), [class: "form-inline my-2 my-lg-0", method: :get, enforce_utf8: false], fn f -> %>
           <div class="input-group">
-            <%= search_input f, :q, class: 'form-control mr-auto', placeholder: gettext("Search by address, transaction hash, or block number"), "aria-describedby": "search-icon", "aria-label": gettext("Search"), "data-test": "search_input" %>
+            <%= search_input f, :q, class: 'form-control mr-auto', placeholder: gettext("Search by address, token symbol name, transaction hash, or block number"), "aria-describedby": "search-icon", "aria-label": gettext("Search"), "data-test": "search_input" %>
             <div class="input-group-append">
               <button class="input-group-text" id="search-icon">
                 <%= render BlockScoutWeb.IconsView, "_search_icon.html" %>

apps/block_scout_web/priv/gettext/default.pot

@@ -733,11 +733,6 @@ msgstr ""
 msgid "Search"
 msgstr ""
 
-#, elixir-format
-#: lib/block_scout_web/templates/layout/_topnav.html.eex:83
-msgid "Search by address, transaction hash, or block number"
-msgstr ""
-
 #, elixir-format
 #:
 #: lib/block_scout_web/templates/address_token_balance/_token_balances.html.eex:28
@@ -1686,3 +1681,8 @@ msgstr ""
 #: lib/block_scout_web/templates/address_contract_verification/new.html.eex:31
 msgid "EVM Vesion"
 msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/layout/_topnav.html.eex:83
+msgid "Search by address, token symbol name, transaction hash, or block number"
+msgstr ""

apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po

@@ -733,11 +733,6 @@ msgstr ""
 msgid "Search"
 msgstr ""
 
-#, elixir-format
-#: lib/block_scout_web/templates/layout/_topnav.html.eex:83
-msgid "Search by address, transaction hash, or block number"
-msgstr ""
-
 #, elixir-format
 #:
 #: lib/block_scout_web/templates/address_token_balance/_token_balances.html.eex:28
@@ -1686,3 +1681,8 @@ msgstr ""
 #: lib/block_scout_web/templates/address_contract_verification/new.html.eex:31
 msgid "EVM Vesion"
 msgstr ""
+
+#, elixir-format, fuzzy
+#: lib/block_scout_web/templates/layout/_topnav.html.eex:83
+msgid "Search by address, token symbol name, transaction hash, or block number"
+msgstr ""

apps/block_scout_web/test/block_scout_web/chain_test.exs

@@ -44,6 +44,13 @@ defmodule BlockScoutWeb.ChainTest do
       assert {:ok, %Address{hash: ^hash}} = address |> Phoenix.Param.to_param() |> Chain.from_param()
     end
 
+    test "finds a token by its name" do
+      name = "AYR"
+      insert(:token, symbol: name)
+
+      assert {:ok, %Address{}} = name |> Chain.from_param()
+    end
+
     test "returns {:error, :not_found} when garbage is passed in" do
       assert {:error, :not_found} = Chain.from_param("any ol' thing")
     end

apps/explorer/lib/explorer/chain.ex

@@ -636,6 +636,22 @@ defmodule Explorer.Chain do
     end
   end
 
+  @spec token_contract_address_from_token_name(String.t()) :: {:ok, Hash.Address.t()} | {:error, :not_found}
+  def token_contract_address_from_token_name(name) when is_binary(name) do
+    query =
+      from(token in Token,
+        where: token.symbol == ^name,
+        select: token.contract_address_hash
+      )
+
+    query
+    |> Repo.one()
+    |> case do
+      nil -> {:error, :not_found}
+      hash -> {:ok, hash}
+    end
+  end
+
   @doc """
   Converts `t:Explorer.Chain.Address.t/0` `hash` to the `t:Explorer.Chain.Address.t/0` with that `hash`.
 

apps/explorer/priv/repo/migrations/20190313085740_add_index_symobl_in_tokens.exs

@@ -0,0 +1,7 @@
+defmodule Explorer.Repo.Migrations.AddIndexSymoblInTokens do
+  use Ecto.Migration
+
+  def change do
+    create(index(:tokens, [:symbol]))
+  end
+end

apps/explorer/test/explorer/chain_test.exs

@@ -841,6 +841,21 @@ defmodule Explorer.ChainTest do
     end
   end
 
+  describe "token_contract_address_from_token_name/1" do
+    test "return not found if token doesn't exist" do
+      name = "AYR"
+
+      assert {:error, :not_found} = Chain.token_contract_address_from_token_name(name)
+    end
+
+    test "return the correct token if it exists" do
+      name = "AYR"
+      insert(:token, symbol: name)
+
+      assert {:ok, _} = Chain.token_contract_address_from_token_name(name)
+    end
+  end
+
   describe "find_or_insert_address_from_hash/1" do
     test "returns an address if it already exists" do
       address = insert(:address)