Merge branch 'classic-flakeids' into 'develop'

Flake Ids for Users and Activities

Closes #450

See merge request pleroma/pleroma!645

1 files changed, 125 insertions, 0 deletions

diff --git a/priv/repo/migrations/20181218172826_users_and_activities_flake_id.exs b/priv/repo/migrations/20181218172826_users_and_activities_flake_id.exs
new file mode 100644
index 000000000..47d2d02da
--- /dev/null
+++ b/priv/repo/migrations/20181218172826_users_and_activities_flake_id.exs
@@ -0,0 +1,125 @@
+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
+  #   2- fill this column with compatibility ids (see below)
+  #   3- remove pkeys constraints
+  #   4- update relation pkeys with the new ids
+  #   5- rename the temporary column to id
+  #   6- re-create the constraints
+  def change do
+    # Old serial int ids are transformed to 128bits with extra padding.
+    # The application (in `Pleroma.FlakeId`) handles theses IDs properly as integers; to keep compatibility
+    # with previously issued ids.
+    #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;"
+
+    execute """
+      ALTER TABLE activities
+      DROP CONSTRAINT activities_pkey CASCADE,
+      ALTER COLUMN id DROP default,
+      ALTER COLUMN id SET DATA TYPE uuid USING CAST( LPAD( TO_HEX(id), 32, '0' ) AS uuid),
+      ADD PRIMARY KEY (id);
+    """
+
+    execute """
+    ALTER TABLE users
+    DROP CONSTRAINT users_pkey CASCADE,
+    ALTER COLUMN id DROP default,
+    ALTER COLUMN id SET DATA TYPE uuid USING CAST( LPAD( TO_HEX(id), 32, '0' ) AS uuid),
+    ADD PRIMARY KEY (id);
+    """
+
+    execute "UPDATE users SET info = jsonb_set(info, '{pinned_activities}', array_to_json(ARRAY(select jsonb_array_elements_text(info->'pinned_activities')))::jsonb);"
+
+    # Fkeys:
+    # Activities - Referenced by:
+    #   TABLE "notifications" CONSTRAINT "notifications_activity_id_fkey" FOREIGN KEY (activity_id) REFERENCES activities(id) ON DELETE CASCADE
+    # Users - Referenced by:
+    #  TABLE "filters" CONSTRAINT "filters_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+    #  TABLE "lists" CONSTRAINT "lists_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+    #  TABLE "notifications" CONSTRAINT "notifications_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+    #  TABLE "oauth_authorizations" CONSTRAINT "oauth_authorizations_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id)
+    #  TABLE "oauth_tokens" CONSTRAINT "oauth_tokens_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id)
+    #  TABLE "password_reset_tokens" CONSTRAINT "password_reset_tokens_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id)
+    #  TABLE "push_subscriptions" CONSTRAINT "push_subscriptions_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+    #  TABLE "websub_client_subscriptions" CONSTRAINT "websub_client_subscriptions_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id)
+
+    execute """
+    ALTER TABLE notifications
+    ALTER COLUMN activity_id SET DATA TYPE uuid USING CAST( LPAD( TO_HEX(activity_id), 32, '0' ) AS uuid),
+    ADD CONSTRAINT notifications_activity_id_fkey FOREIGN KEY (activity_id) REFERENCES activities(id) ON DELETE CASCADE;
+    """
+
+    for table <- ~w(notifications filters lists oauth_authorizations oauth_tokens password_reset_tokens push_subscriptions websub_client_subscriptions) do
+      execute """
+      ALTER TABLE #{table}
+      ALTER COLUMN user_id SET DATA TYPE uuid USING CAST( LPAD( TO_HEX(user_id), 32, '0' ) AS uuid),
+      ADD CONSTRAINT #{table}_user_id_fkey FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE;
+      """
+    end
+
+    flush()
+
+    stop_clippy_heartbeats(clippy)
+  end
+
+  defp start_clippy_heartbeats() do
+    count = from(a in "activities", select: count(a.id)) |> Repo.one!
+
+    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 cofe, 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