BlockFetcher.realtime_task -> BlockFetcher.Realtime.task

apps/indexer/lib/indexer/block_fetcher.ex

@@ -11,7 +11,7 @@ defmodule Indexer.BlockFetcher do
 
   alias Explorer.Chain
   alias Indexer.{BalanceFetcher, AddressExtraction, BoundInterval, InternalTransactionFetcher, Sequence}
-  alias Indexer.BlockFetcher.Catchup
+  alias Indexer.BlockFetcher.{Catchup, Realtime}
 
   # dialyzer thinks that Logger.debug functions always have no_local_return
   @dialyzer {:nowarn_function, import_range: 4}
@@ -123,52 +123,15 @@ defmodule Indexer.BlockFetcher do
   end
 
   def handle_info(:realtime_index, %__MODULE__{} = state) do
-    %Task{ref: ref} =
-      realtime_task = Task.Supervisor.async_nolink(Indexer.TaskSupervisor, fn -> realtime_task(state) end)
-
-    new_state = put_in(state.realtime_task_by_ref[ref], realtime_task)
-
-    {:noreply, new_state}
+    {:noreply, Realtime.put(state)}
   end
 
-  def handle_info({ref, :ok = result}, %__MODULE__{realtime_task_by_ref: realtime_task_by_ref} = state) do
-    {realtime_task, running_realtime_task_by_ref} = Map.pop(realtime_task_by_ref, ref)
-
-    case realtime_task do
-      nil ->
-        Logger.error(fn ->
-          "Unknown ref (#{inspect(ref)}) that is neither the catchup index" <>
-            " nor a realtime index Task ref returned result (#{inspect(result)})"
-        end)
-
-      _ ->
-        :ok
-    end
-
-    Process.demonitor(ref, [:flush])
-
-    {:noreply, %__MODULE__{state | realtime_task_by_ref: running_realtime_task_by_ref}}
+  def handle_info({ref, :ok} = message, %__MODULE__{} = state) when is_reference(ref) do
+    {:noreply, Realtime.handle_success(message, state)}
   end
 
-  def handle_info({:DOWN, ref, :process, pid, reason}, %__MODULE__{realtime_task_by_ref: realtime_task_by_ref} = state) do
-    {realtime_task, running_realtime_task_by_ref} = Map.pop(realtime_task_by_ref, ref)
-
-    case realtime_task do
-      nil ->
-        Logger.error(fn ->
-          "Unknown ref (#{inspect(ref)}) that is neither the catchup index" <>
-            " nor a realtime index Task ref reports unknown pid (#{pid}) DOWN due to reason (#{reason}})"
-        end)
-
-      _ ->
-        Logger.error(fn ->
-          "Realtime index stream exited with reason (#{inspect(reason)}).  " <>
-            "The next realtime index task will fill the missing block " <>
-            "if the lastest block number has not advanced by then or the catch up index will fill the missing block."
-        end)
-    end
-
-    {:noreply, %__MODULE__{state | realtime_task_by_ref: running_realtime_task_by_ref}}
+  def handle_info({:DOWN, _, :process, _, _} = message, %__MODULE__{} = state) do
+    {:noreply, Realtime.handle_failure(message, state)}
   end
 
   defp cap_seq(seq, next, range) do
@@ -286,12 +249,6 @@ defmodule Indexer.BlockFetcher do
     |> InternalTransactionFetcher.async_fetch(10_000)
   end
 
-  defp realtime_task(%__MODULE__{json_rpc_named_arguments: json_rpc_named_arguments} = state) do
-    {:ok, latest_block_number} = EthereumJSONRPC.fetch_block_number_by_tag("latest", json_rpc_named_arguments)
-    {:ok, seq} = Sequence.start_link(first: latest_block_number, step: 2)
-    stream_import(state, seq, :realtime_index, max_concurrency: 1)
-  end
-
   # Run at state.blocks_concurrency max_concurrency when called by `stream_import/3`
   # Only public for testing
   @doc false

apps/indexer/lib/indexer/block_fetcher/realtime.ex

@@ -0,0 +1,69 @@
+defmodule Indexer.BlockFetcher.Realtime do
+  @moduledoc """
+  Fetches and indexes block ranges from latest block forward.
+  """
+
+  require Logger
+
+  import Indexer.BlockFetcher, only: [stream_import: 4]
+
+  alias Indexer.{BlockFetcher, Sequence}
+
+  @doc """
+  Starts `task/1` and puts it in `t:Indexer.BlockFetcher.t/0` `realtime_task_by_ref`.
+  """
+  def put(%BlockFetcher{} = state) do
+    %Task{ref: ref} = realtime_task = Task.Supervisor.async_nolink(Indexer.TaskSupervisor, __MODULE__, :task, [state])
+
+    put_in(state.realtime_task_by_ref[ref], realtime_task)
+  end
+
+  def task(%BlockFetcher{json_rpc_named_arguments: json_rpc_named_arguments} = state) do
+    {:ok, latest_block_number} = EthereumJSONRPC.fetch_block_number_by_tag("latest", json_rpc_named_arguments)
+    {:ok, seq} = Sequence.start_link(first: latest_block_number, step: 2)
+    stream_import(state, seq, :realtime_index, max_concurrency: 1)
+  end
+
+  def handle_success({ref, :ok = result}, %BlockFetcher{realtime_task_by_ref: realtime_task_by_ref} = state) do
+    {realtime_task, running_realtime_task_by_ref} = Map.pop(realtime_task_by_ref, ref)
+
+    case realtime_task do
+      nil ->
+        Logger.error(fn ->
+          "Unknown ref (#{inspect(ref)}) that is neither the catchup index" <>
+            " nor a realtime index Task ref returned result (#{inspect(result)})"
+        end)
+
+      _ ->
+        :ok
+    end
+
+    Process.demonitor(ref, [:flush])
+
+    %BlockFetcher{state | realtime_task_by_ref: running_realtime_task_by_ref}
+  end
+
+  def handle_failure(
+        {:DOWN, ref, :process, pid, reason},
+        %BlockFetcher{realtime_task_by_ref: realtime_task_by_ref} = state
+      ) do
+    {realtime_task, running_realtime_task_by_ref} = Map.pop(realtime_task_by_ref, ref)
+
+    case realtime_task do
+      nil ->
+        Logger.error(fn ->
+          "Unknown ref (#{inspect(ref)}) that is neither the catchup index" <>
+            " nor a realtime index Task ref reports unknown pid (#{pid}) DOWN due to reason (#{reason}})"
+        end)
+
+      _ ->
+        Logger.error(fn ->
+          "Realtime index stream exited with reason (#{inspect(reason)}).  " <>
+            "The next realtime index task will fill the missing block " <>
+            "if the lastest block number has not advanced by then or the catch up index will fill the missing block."
+        end)
+    end
+
+    %BlockFetcher{state | realtime_task_by_ref: running_realtime_task_by_ref}
+  end
+end