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[#3213] Background migration infrastructure refactoring. 

Extracted BaseMigrator and BaseMigratorState.
This commit is contained in:
Ivan Tashkinov 2021-03-12 12:18:11 +03:00
parent fbcddd8126
commit 3edf45021e
5 changed files with 385 additions and 321 deletions
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11
lib/pleroma/application.ex
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@ -103,10 +103,7 @@ def start(_type, _args) do
task_children(@mix_env) ++
dont_run_in_test(@mix_env) ++
chat_child(chat_enabled?()) ++
[
Pleroma.Migrators.HashtagsTableMigrator,
Pleroma.Gopher.Server
]
[Pleroma.Gopher.Server]
# See http://elixir-lang.org/docs/stable/elixir/Supervisor.html
# for other strategies and supported options
@ -231,6 +228,12 @@ defp dont_run_in_test(_) do
keys: :duplicate,
partitions: System.schedulers_online()
]}
] ++ background_migrators()
end
defp background_migrators do
[
Pleroma.Migrators.HashtagsTableMigrator
]
end

265
lib/pleroma/migrators/hashtags_table_migrator.ex
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@ -3,88 +3,27 @@
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Migrators.HashtagsTableMigrator do
use GenServer
require Logger
import Ecto.Query
alias __MODULE__.State
alias Pleroma.Config
alias Pleroma.Hashtag
alias Pleroma.Object
alias Pleroma.Repo
defmodule State do
use Pleroma.Migrators.Support.BaseMigratorState
@impl Pleroma.Migrators.Support.BaseMigratorState
defdelegate data_migration(), to: Pleroma.DataMigration, as: :populate_hashtags_table
defdelegate data_migration_id(), to: State
defdelegate state(), to: State
defdelegate persist_state(), to: State, as: :persist_to_db
defdelegate get_stat(key, value \\ nil), to: State, as: :get_data_key
defdelegate put_stat(key, value), to: State, as: :put_data_key
defdelegate increment_stat(key, increment), to: State, as: :increment_data_key
@feature_config_path [:features, :improved_hashtag_timeline]
@reg_name {:global, __MODULE__}
def whereis, do: GenServer.whereis(@reg_name)
def feature_state, do: Config.get(@feature_config_path)
def start_link(_) do
case whereis() do
nil ->
GenServer.start_link(__MODULE__, nil, name: @reg_name)
pid ->
{:ok, pid}
end
end
@impl true
def init(_) do
{:ok, nil, {:continue, :init_state}}
end
use Pleroma.Migrators.Support.BaseMigrator
@impl true
def handle_continue(:init_state, _state) do
{:ok, _} = State.start_link(nil)
alias Pleroma.Hashtag
alias Pleroma.Migrators.Support.BaseMigrator
alias Pleroma.Object
data_migration = data_migration()
manual_migrations = Config.get([:instance, :manual_data_migrations], [])
@impl BaseMigrator
def feature_config_path, do: [:features, :improved_hashtag_timeline]
cond do
Config.get(:env) == :test ->
update_status(:noop)
is_nil(data_migration) ->
message = "Data migration does not exist."
update_status(:failed, message)
Logger.error("#{__MODULE__}: #{message}")
data_migration.state == :manual or data_migration.name in manual_migrations ->
message = "Data migration is in manual execution or manual fix mode."
update_status(:manual, message)
Logger.warn("#{__MODULE__}: #{message}")
data_migration.state == :complete ->
on_complete(data_migration)
true ->
send(self(), :migrate_hashtags)
end
{:noreply, nil}
end
@impl true
def handle_info(:migrate_hashtags, state) do
State.reinit()
update_status(:running)
put_stat(:iteration_processed_count, 0)
put_stat(:started_at, NaiveDateTime.utc_now())
@impl BaseMigrator
def fault_rate_allowance, do: Config.get([:populate_hashtags_table, :fault_rate_allowance], 0)
@impl BaseMigrator
def perform do
data_migration_id = data_migration_id()
max_processed_id = get_stat(:max_processed_id, 0)
@ -103,7 +42,7 @@ def handle_info(:migrate_hashtags, state) do
|> Enum.filter(&(elem(&1, 0) == :error))
|> Enum.map(&elem(&1, 1))
# Count of objects with hashtags (`{:noop, id}` is returned for objects having other AS2 tags)
# Count of objects with hashtags: `{:noop, id}` is returned for objects having other AS2 tags
chunk_affected_count =
results
|> Enum.filter(&(elem(&1, 0) == :ok))
@ -140,84 +79,10 @@ def handle_info(:migrate_hashtags, state) do
Process.sleep(sleep_interval)
end)
|> Stream.run()
fault_rate = fault_rate()
put_stat(:fault_rate, fault_rate)
fault_rate_allowance = Config.get([:populate_hashtags_table, :fault_rate_allowance], 0)
cond do
fault_rate == 0 ->
set_complete()
is_float(fault_rate) and fault_rate <= fault_rate_allowance ->
message = """
Done with fault rate of #{fault_rate} which doesn't exceed #{fault_rate_allowance}.
Putting data migration to manual fix mode. Check `retry_failed/0`.
"""
Logger.warn("#{__MODULE__}: #{message}")
update_status(:manual, message)
on_complete(data_migration())
true ->
message = "Too many failures. Check data_migration_failed_ids records / `retry_failed/0`."
Logger.error("#{__MODULE__}: #{message}")
update_status(:failed, message)
end
persist_state()
{:noreply, state}
end
def fault_rate do
with failures_count when is_integer(failures_count) <- failures_count() do
failures_count / Enum.max([get_stat(:affected_count, 0), 1])
else
_ -> :error
end
end
defp records_per_second do
get_stat(:iteration_processed_count, 0) / Enum.max([running_time(), 1])
end
defp running_time do
NaiveDateTime.diff(NaiveDateTime.utc_now(), get_stat(:started_at, NaiveDateTime.utc_now()))
end
@hashtags_objects_cleanup_query """
DELETE FROM hashtags_objects WHERE object_id IN
(SELECT DISTINCT objects.id FROM objects
JOIN hashtags_objects ON hashtags_objects.object_id = objects.id LEFT JOIN activities
ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') =
(objects.data->>'id')
AND activities.data->>'type' = 'Create'
WHERE activities.id IS NULL);
"""
@hashtags_cleanup_query """
DELETE FROM hashtags WHERE id IN
(SELECT hashtags.id FROM hashtags
LEFT OUTER JOIN hashtags_objects
ON hashtags_objects.hashtag_id = hashtags.id
WHERE hashtags_objects.hashtag_id IS NULL);
"""
@doc """
Deletes `hashtags_objects` for legacy objects not asoociated with Create activity.
Also deletes unreferenced `hashtags` records (might occur after deletion of `hashtags_objects`).
"""
def delete_non_create_activities_hashtags do
{:ok, %{num_rows: hashtags_objects_count}} =
Repo.query(@hashtags_objects_cleanup_query, [], timeout: :infinity)
{:ok, %{num_rows: hashtags_count}} =
Repo.query(@hashtags_cleanup_query, [], timeout: :infinity)
{:ok, hashtags_objects_count, hashtags_count}
end
defp query do
@impl BaseMigrator
def query do
# Note: most objects have Mention-type AS2 tags and no hashtags (but we can't filter them out)
# Note: not checking activity type, expecting remove_non_create_objects_hashtags/_ to clean up
from(
@ -276,54 +141,7 @@ defp transfer_object_hashtags(object, hashtags) do
end)
end
@doc "Approximate count for current iteration (including processed records count)"
def count(force \\ false, timeout \\ :infinity) do
stored_count = get_stat(:count)
if stored_count && !force do
stored_count
else
processed_count = get_stat(:processed_count, 0)
max_processed_id = get_stat(:max_processed_id, 0)
query = where(query(), [object], object.id > ^max_processed_id)
count = Repo.aggregate(query, :count, :id, timeout: timeout) + processed_count
put_stat(:count, count)
persist_state()
count
end
end
defp on_complete(data_migration) do
if data_migration.feature_lock || feature_state() == :disabled do
Logger.warn("#{__MODULE__}: migration complete but feature is locked; consider enabling.")
:noop
else
Config.put(@feature_config_path, :enabled)
:ok
end
end
def failed_objects_query do
from(o in Object)
|> join(:inner, [o], dmf in fragment("SELECT * FROM data_migration_failed_ids"),
on: dmf.record_id == o.id
)
|> where([_o, dmf], dmf.data_migration_id == ^data_migration_id())
|> order_by([o], asc: o.id)
end
def failures_count do
with {:ok, %{rows: [[count]]}} <-
Repo.query(
"SELECT COUNT(record_id) FROM data_migration_failed_ids WHERE data_migration_id = $1;",
[data_migration_id()]
) do
count
end
end
@impl BaseMigrator
def retry_failed do
data_migration_id = data_migration_id()
@ -347,23 +165,44 @@ def retry_failed do
force_continue()
end
def force_continue do
send(whereis(), :migrate_hashtags)
defp failed_objects_query do
from(o in Object)
|> join(:inner, [o], dmf in fragment("SELECT * FROM data_migration_failed_ids"),
on: dmf.record_id == o.id
)
|> where([_o, dmf], dmf.data_migration_id == ^data_migration_id())
|> order_by([o], asc: o.id)
end
def force_restart do
:ok = State.reset()
force_continue()
end
@doc """
Service func to delete `hashtags_objects` for legacy objects not associated with Create activity.
Also deletes unreferenced `hashtags` records (might occur after deletion of `hashtags_objects`).
"""
def delete_non_create_activities_hashtags do
hashtags_objects_cleanup_query = """
DELETE FROM hashtags_objects WHERE object_id IN
(SELECT DISTINCT objects.id FROM objects
JOIN hashtags_objects ON hashtags_objects.object_id = objects.id LEFT JOIN activities
ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') =
(objects.data->>'id')
AND activities.data->>'type' = 'Create'
WHERE activities.id IS NULL);
"""
def set_complete do
update_status(:complete)
persist_state()
on_complete(data_migration())
end
hashtags_cleanup_query = """
DELETE FROM hashtags WHERE id IN
(SELECT hashtags.id FROM hashtags
LEFT OUTER JOIN hashtags_objects
ON hashtags_objects.hashtag_id = hashtags.id
WHERE hashtags_objects.hashtag_id IS NULL);
"""
defp update_status(status, message \\ nil) do
put_stat(:state, status)
put_stat(:message, message)
{:ok, %{num_rows: hashtags_objects_count}} =
Repo.query(hashtags_objects_cleanup_query, [], timeout: :infinity)
{:ok, %{num_rows: hashtags_count}} =
Repo.query(hashtags_cleanup_query, [], timeout: :infinity)
{:ok, hashtags_objects_count, hashtags_count}
end
end

104
lib/pleroma/migrators/hashtags_table_migrator/state.ex
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@ -1,104 +0,0 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Migrators.HashtagsTableMigrator.State do
use Agent
alias Pleroma.DataMigration
defdelegate data_migration(), to: Pleroma.Migrators.HashtagsTableMigrator
@reg_name {:global, __MODULE__}
def start_link(_) do
Agent.start_link(fn -> load_state_from_db() end, name: @reg_name)
end
defp load_state_from_db do
data_migration = data_migration()
data =
if data_migration do
Map.new(data_migration.data, fn {k, v} -> {String.to_atom(k), v} end)
else
%{}
end
%{
data_migration_id: data_migration && data_migration.id,
data: data
}
end
def persist_to_db do
%{data_migration_id: data_migration_id, data: data} = state()
if data_migration_id do
DataMigration.update_one_by_id(data_migration_id, data: data)
else
{:error, :nil_data_migration_id}
end
end
def reset do
%{data_migration_id: data_migration_id} = state()
with false <- is_nil(data_migration_id),
:ok <-
DataMigration.update_one_by_id(data_migration_id,
state: :pending,
data: %{}
) do
reinit()
else
true -> {:error, :nil_data_migration_id}
e -> e
end
end
def reinit do
Agent.update(@reg_name, fn _state -> load_state_from_db() end)
end
def state do
Agent.get(@reg_name, & &1)
end
def get_data_key(key, default \\ nil) do
get_in(state(), [:data, key]) || default
end
def put_data_key(key, value) do
_ = persist_non_data_change(key, value)
Agent.update(@reg_name, fn state ->
put_in(state, [:data, key], value)
end)
end
def increment_data_key(key, increment \\ 1) do
Agent.update(@reg_name, fn state ->
initial_value = get_in(state, [:data, key]) || 0
updated_value = initial_value + increment
put_in(state, [:data, key], updated_value)
end)
end
defp persist_non_data_change(:state, value) do
with true <- get_data_key(:state) != value,
true <- value in Pleroma.DataMigration.State.__valid_values__(),
%{data_migration_id: data_migration_id} when not is_nil(data_migration_id) <- state() do
DataMigration.update_one_by_id(data_migration_id, state: value)
else
false -> :ok
_ -> {:error, :nil_data_migration_id}
end
end
defp persist_non_data_change(_, _) do
nil
end
def data_migration_id, do: Map.get(state(), :data_migration_id)
end

210
lib/pleroma/migrators/support/base_migrator.ex Normal file
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@ -0,0 +1,210 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Migrators.Support.BaseMigrator do
@moduledoc """
Base background migrator functionality.
"""
@callback perform() :: any()
@callback retry_failed() :: any()
@callback feature_config_path() :: list(atom())
@callback query() :: Ecto.Query.t()
@callback fault_rate_allowance() :: integer() | float()
defmacro __using__(_opts) do
quote do
use GenServer
require Logger
import Ecto.Query
alias __MODULE__.State
alias Pleroma.Config
alias Pleroma.Repo
@behaviour Pleroma.Migrators.Support.BaseMigrator
defdelegate data_migration(), to: State
defdelegate data_migration_id(), to: State
defdelegate state(), to: State
defdelegate persist_state(), to: State, as: :persist_to_db
defdelegate get_stat(key, value \\ nil), to: State, as: :get_data_key
defdelegate put_stat(key, value), to: State, as: :put_data_key
defdelegate increment_stat(key, increment), to: State, as: :increment_data_key
@reg_name {:global, __MODULE__}
def whereis, do: GenServer.whereis(@reg_name)
def start_link(_) do
case whereis() do
nil ->
GenServer.start_link(__MODULE__, nil, name: @reg_name)
pid ->
{:ok, pid}
end
end
@impl true
def init(_) do
{:ok, nil, {:continue, :init_state}}
end
@impl true
def handle_continue(:init_state, _state) do
{:ok, _} = State.start_link(nil)
data_migration = data_migration()
manual_migrations = Config.get([:instance, :manual_data_migrations], [])
cond do
Config.get(:env) == :test ->
update_status(:noop)
is_nil(data_migration) ->
message = "Data migration does not exist."
update_status(:failed, message)
Logger.error("#{__MODULE__}: #{message}")
data_migration.state == :manual or data_migration.name in manual_migrations ->
message = "Data migration is in manual execution or manual fix mode."
update_status(:manual, message)
Logger.warn("#{__MODULE__}: #{message}")
data_migration.state == :complete ->
on_complete(data_migration)
true ->
send(self(), :perform)
end
{:noreply, nil}
end
@impl true
def handle_info(:perform, state) do
State.reinit()
update_status(:running)
put_stat(:iteration_processed_count, 0)
put_stat(:started_at, NaiveDateTime.utc_now())
perform()
fault_rate = fault_rate()
put_stat(:fault_rate, fault_rate)
fault_rate_allowance = fault_rate_allowance()
cond do
fault_rate == 0 ->
set_complete()
is_float(fault_rate) and fault_rate <= fault_rate_allowance ->
message = """
Done with fault rate of #{fault_rate} which doesn't exceed #{fault_rate_allowance}.
Putting data migration to manual fix mode. Try running `#{__MODULE__}.retry_failed/0`.
"""
Logger.warn("#{__MODULE__}: #{message}")
update_status(:manual, message)
on_complete(data_migration())
true ->
message = "Too many failures. Try running `#{__MODULE__}.retry_failed/0`."
Logger.error("#{__MODULE__}: #{message}")
update_status(:failed, message)
end
persist_state()
{:noreply, state}
end
defp on_complete(data_migration) do
if data_migration.feature_lock || feature_state() == :disabled do
Logger.warn(
"#{__MODULE__}: migration complete but feature is locked; consider enabling."
)
:noop
else
Config.put(feature_config_path(), :enabled)
:ok
end
end
@doc "Approximate count for current iteration (including processed records count)"
def count(force \\ false, timeout \\ :infinity) do
stored_count = get_stat(:count)
if stored_count && !force do
stored_count
else
processed_count = get_stat(:processed_count, 0)
max_processed_id = get_stat(:max_processed_id, 0)
query = where(query(), [entity], entity.id > ^max_processed_id)
count = Repo.aggregate(query, :count, :id, timeout: timeout) + processed_count
put_stat(:count, count)
persist_state()
count
end
end
def failures_count do
with {:ok, %{rows: [[count]]}} <-
Repo.query(
"SELECT COUNT(record_id) FROM data_migration_failed_ids WHERE data_migration_id = $1;",
[data_migration_id()]
) do
count
end
end
def feature_state, do: Config.get(feature_config_path())
def force_continue do
send(whereis(), :perform)
end
def force_restart do
:ok = State.reset()
force_continue()
end
def set_complete do
update_status(:complete)
persist_state()
on_complete(data_migration())
end
defp update_status(status, message \\ nil) do
put_stat(:state, status)
put_stat(:message, message)
end
defp fault_rate do
with failures_count when is_integer(failures_count) <- failures_count() do
failures_count / Enum.max([get_stat(:affected_count, 0), 1])
else
_ -> :error
end
end
defp records_per_second do
get_stat(:iteration_processed_count, 0) / Enum.max([running_time(), 1])
end
defp running_time do
NaiveDateTime.diff(
NaiveDateTime.utc_now(),
get_stat(:started_at, NaiveDateTime.utc_now())
)
end
end
end
end

116
lib/pleroma/migrators/support/base_migrator_state.ex Normal file
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@ -0,0 +1,116 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Migrators.Support.BaseMigratorState do
@moduledoc """
Base background migrator state functionality.
"""
@callback data_migration() :: Pleroma.DataMigration.t()
defmacro __using__(_opts) do
quote do
use Agent
alias Pleroma.DataMigration
@behaviour Pleroma.Migrators.Support.BaseMigratorState
@reg_name {:global, __MODULE__}
def start_link(_) do
Agent.start_link(fn -> load_state_from_db() end, name: @reg_name)
end
def data_migration, do: raise("data_migration/0 is not implemented")
defoverridable data_migration: 0
defp load_state_from_db do
data_migration = data_migration()
data =
if data_migration do
Map.new(data_migration.data, fn {k, v} -> {String.to_atom(k), v} end)
else
%{}
end
%{
data_migration_id: data_migration && data_migration.id,
data: data
}
end
def persist_to_db do
%{data_migration_id: data_migration_id, data: data} = state()
if data_migration_id do
DataMigration.update_one_by_id(data_migration_id, data: data)
else
{:error, :nil_data_migration_id}
end
end
def reset do
%{data_migration_id: data_migration_id} = state()
with false <- is_nil(data_migration_id),
:ok <-
DataMigration.update_one_by_id(data_migration_id,
state: :pending,
data: %{}
) do
reinit()
else
true -> {:error, :nil_data_migration_id}
e -> e
end
end
def reinit do
Agent.update(@reg_name, fn _state -> load_state_from_db() end)
end
def state do
Agent.get(@reg_name, & &1)
end
def get_data_key(key, default \\ nil) do
get_in(state(), [:data, key]) || default
end
def put_data_key(key, value) do
_ = persist_non_data_change(key, value)
Agent.update(@reg_name, fn state ->
put_in(state, [:data, key], value)
end)
end
def increment_data_key(key, increment \\ 1) do
Agent.update(@reg_name, fn state ->
initial_value = get_in(state, [:data, key]) || 0
updated_value = initial_value + increment
put_in(state, [:data, key], updated_value)
end)
end
defp persist_non_data_change(:state, value) do
with true <- get_data_key(:state) != value,
true <- value in Pleroma.DataMigration.State.__valid_values__(),
%{data_migration_id: data_migration_id} when not is_nil(data_migration_id) <- state() do
DataMigration.update_one_by_id(data_migration_id, state: value)
else
false -> :ok
_ -> {:error, :nil_data_migration_id}
end
end
defp persist_non_data_change(_, _) do
nil
end
def data_migration_id, do: Map.get(state(), :data_migration_id)
end
end
end