Clippy!

priv/repo/migrations/20181218172826_users_and_activities_flake_id.exs

@@ -1,5 +1,9 @@
 defmodule Pleroma.Repo.Migrations.UsersAndActivitiesFlakeId do
   use Ecto.Migration
+  alias Pleroma.Clippy
+  require Integer
+  import Ecto.Query
+  alias Pleroma.Repo
 
   # This migrates from int serial IDs to custom Flake:
   #   1- create a temporary uuid column
@@ -15,6 +19,8 @@ defmodule Pleroma.Repo.Migrations.UsersAndActivitiesFlakeId do
     #execute "update activities set external_id = CAST( LPAD( TO_HEX(id), 32, '0' ) AS uuid);"
     #execute "update users set external_id = CAST( LPAD( TO_HEX(id), 32, '0' ) AS uuid);"
 
+    clippy = start_clippy_heartbeats()
+
     # Lock both tables to avoid a running server to meddling with our transaction
     execute "LOCK TABLE activities;"
     execute "LOCK TABLE users;"
@@ -52,5 +58,54 @@ defmodule Pleroma.Repo.Migrations.UsersAndActivitiesFlakeId do
       execute "ALTER TABLE #{table} ADD CONSTRAINT #{table}_user_id_fkey FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE;"
     end
 
+    stop_clippy_heartbeats(clippy)
   end
+
+  defp start_clippy_heartbeats() do
+    count = from(a in "activities", select: count(a.id)) |> Repo.one!
+
+    pid = if count > 5000 do
+      heartbeat_interval = :timer.minutes(2) + :timer.seconds(30)
+      all_tips = Clippy.tips() ++ [
+        "The migration is still running, maybe it's time for another tea?",
+        "Happy rabbits practice a cute behavior known as a\n“binky:” they jump up in the air\nand twist\nand spin around!",
+        "Nothing and everything.\n\nI still work.",
+        "Pleroma runs on a Raspberry Pi!\n\n  … but this migration will take forever if you\nactually run on a raspberry pi",
+        "Status? Stati? Post? Note? Toot?\nRepeat? Reboost? Boost? Retweet? Retoot??\n\nI-I'm confused.",
+      ]
+
+      heartbeat = fn(heartbeat, runs, all_tips, tips) ->
+        tips = if Integer.is_even(runs) do
+          tips = if tips == [], do: all_tips, else: tips
+          [tip | tips] = Enum.shuffle(tips)
+          Clippy.puts(tip)
+          tips
+        else
+          IO.puts "\n -- #{DateTime.to_string(DateTime.utc_now())} Migration still running, please wait…\n"
+          tips
+        end
+        :timer.sleep(heartbeat_interval)
+        heartbeat.(heartbeat, runs + 1, all_tips, tips)
+      end
+
+      Clippy.puts [
+        [:red, :bright, "It looks like you are running an older instance!"],
+        [""],
+        [:bright, "This migration may take a long time", :reset, " -- so you probably should"],
+        ["go drink a coffee, or a tea, or a beer, a whiskey, a vodka,"],
+        ["while it runs to deal with your temporary fediverse pause!"]
+      ]
+      :timer.sleep(heartbeat_interval)
+      spawn_link(fn() -> heartbeat.(heartbeat, 1, all_tips, []) end)
+    end
+  end
+
+  defp stop_clippy_heartbeats(pid) do
+    if pid do
+      Process.unlink(pid)
+      Process.exit(pid, :kill)
+      Clippy.puts [[:green, :bright, "Hurray!!", "", "", "Migration completed!"]]
+    end
+  end
+
 end