Fix splitting setup

CHANGELOG.md

@@ -5,6 +5,7 @@
 - [#2834](https://github.com/poanetwork/blockscout/pull/2834) - always redirect to checksummed hash
 
 ### Fixes
+- [#3025](https://github.com/poanetwork/blockscout/pull/3025) - Fix splitting of indexer/web components setup
 - [#3021](https://github.com/poanetwork/blockscout/pull/3021), [#3022](https://github.com/poanetwork/blockscout/pull/3022) - Refine dev/test config
 - [#3016](https://github.com/poanetwork/blockscout/pull/3016), [#3017](https://github.com/poanetwork/blockscout/pull/3017) - Fix token instance QR code data
 - [#3014](https://github.com/poanetwork/blockscout/pull/3014) - Fix checksum address feature for tokens pages

apps/explorer/lib/explorer/chain.ex

@@ -4033,4 +4033,15 @@ defmodule Explorer.Chain do
   defp boolean_to_check_result(true), do: :ok
 
   defp boolean_to_check_result(false), do: :not_found
+
+  def extract_db_name(db_url) do
+    if db_url == nil do
+      ""
+    else
+      db_url
+      |> String.split("/")
+      |> Enum.take(-1)
+      |> Enum.at(0)
+    end
+  end
 end

apps/explorer/lib/explorer/chain/events/listener.ex

@@ -6,15 +6,22 @@ defmodule Explorer.Chain.Events.Listener do
   use GenServer
 
   alias Postgrex.Notifications
+  import Explorer.Chain, only: [extract_db_name: 1]
 
   def start_link(_) do
     GenServer.start_link(__MODULE__, "chain_event", name: __MODULE__)
   end
 
   def init(channel) do
-    {:ok, pid} =
+    explorer_repo =
       :explorer
       |> Application.get_env(Explorer.Repo)
+
+    db_url = explorer_repo[:url]
+
+    {:ok, pid} =
+      explorer_repo
+      |> Keyword.put(:database, extract_db_name(db_url))
       |> Notifications.start_link()
 
     ref = Notifications.listen!(pid, channel)

apps/explorer/test/explorer/chain_test.exs

@@ -4608,4 +4608,21 @@ defmodule Explorer.ChainTest do
       assert third.delta == Decimal.new(1)
     end
   end
+
+  describe "extract_db_name/1" do
+    test "extracts correct db name" do
+      db_url = "postgresql://viktor:@localhost:5432/blockscout-dev-1"
+      assert Chain.extract_db_name(db_url) == "blockscout-dev-1"
+    end
+
+    test "returns empty db name" do
+      db_url = ""
+      assert Chain.extract_db_name(db_url) == ""
+    end
+
+    test "returns nil db name" do
+      db_url = nil
+      assert Chain.extract_db_name(db_url) == ""
+    end
+  end
 end