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20181218172826_users_and_activities_flake_id.exs
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20181218172826_users_and_activities_flake_id.exs
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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 up 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
def down, do: :ok
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

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