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# frozen_string_literal: true
class SwapNotesIdToBigintForGitlabDotCom < Gitlab::Database::Migration[2.1]
include Gitlab::Database::MigrationHelpers::ConvertToBigint
disable_ddl_transaction!
TABLE_NAME = 'notes'
PK_INDEX_NAME = 'index_notes_on_id_convert_to_bigint'
SECONDARY_INDEXES = [
{
original_name: :index_notes_on_author_id_and_created_at_and_id,
temporary_name: :index_notes_on_author_id_created_at_id_convert_to_bigint,
columns: [:author_id, :created_at, :id_convert_to_bigint],
options: {}
},
{
original_name: :index_notes_on_id_where_confidential,
temporary_name: :index_notes_on_id_convert_to_bigint_where_confidential,
columns: [:id_convert_to_bigint],
options: { where: 'confidential = true' }
},
{
original_name: :index_notes_on_id_where_internal,
temporary_name: :index_notes_on_id_convert_to_bigint_where_internal,
columns: [:id_convert_to_bigint],
options: { where: 'internal = true' }
},
{
original_name: :index_notes_on_project_id_and_id_and_system_false,
temporary_name: :index_notes_on_project_id_id_convert_to_bigint_system_false,
columns: [:project_id, :id_convert_to_bigint],
options: { where: 'NOT system' }
},
{
original_name: :note_mentions_temp_index,
temporary_name: :note_mentions_temp_index_convert_to_bigint,
columns: [:id_convert_to_bigint, :noteable_type],
options: { where: "note ~~ '%@%'::text" }
}
]
REFERENCING_FOREIGN_KEYS = [
[:todos, :fk_91d1f47b13, :note_id, :cascade],
[:incident_management_timeline_events, :fk_d606a2a890, :promoted_from_note_id, :nullify],
[:system_note_metadata, :fk_d83a918cb1, :note_id, :cascade],
[:diff_note_positions, :fk_rails_13c7212859, :note_id, :cascade],
[:epic_user_mentions, :fk_rails_1c65976a49, :note_id, :cascade],
[:suggestions, :fk_rails_33b03a535c, :note_id, :cascade],
[:issue_user_mentions, :fk_rails_3861d9fefa, :note_id, :cascade],
[:note_diff_files, :fk_rails_3d66047aeb, :diff_note_id, :cascade],
[:snippet_user_mentions, :fk_rails_4d3f96b2cb, :note_id, :cascade],
[:design_user_mentions, :fk_rails_8de8c6d632, :note_id, :cascade],
[:vulnerability_user_mentions, :fk_rails_a18600f210, :note_id, :cascade],
[:commit_user_mentions, :fk_rails_a6760813e0, :note_id, :cascade],
[:merge_request_user_mentions, :fk_rails_c440b9ea31, :note_id, :cascade],
[:note_metadata, :fk_rails_d853224d37, :note_id, :cascade],
[:alert_management_alert_user_mentions, :fk_rails_eb2de0cdef, :note_id, :cascade],
[:timelogs, :fk_timelogs_note_id, :note_id, :nullify]
]
def up
return unless should_run?
swap
end
def down
return unless should_run?
swap
add_concurrent_index TABLE_NAME, :id_convert_to_bigint, unique: true, name: PK_INDEX_NAME
REFERENCING_FOREIGN_KEYS.each do |(from_table, name, column, on_delete)|
temporary_name = "#{name}_tmp"
add_concurrent_foreign_key(
from_table,
TABLE_NAME,
column: column,
target_column: :id_convert_to_bigint,
name: temporary_name,
on_delete: on_delete,
reverse_lock_order: true,
validate: false)
end
end
def swap
# Copy existing indexes from the original column to the new column
create_indexes
# Copy existing FKs from the original column to the new column
create_referencing_foreign_keys
# Remove existing FKs from the referencing tables, so we don't have to lock on them when we drop the existing PK
replace_referencing_foreign_keys
with_lock_retries(raise_on_exhaustion: true) do
# Swap the original and new column names
execute "ALTER TABLE #{TABLE_NAME} RENAME COLUMN id TO id_tmp"
execute "ALTER TABLE #{TABLE_NAME} RENAME COLUMN id_convert_to_bigint TO id"
execute "ALTER TABLE #{TABLE_NAME} RENAME COLUMN id_tmp TO id_convert_to_bigint"
# Reset the function so PG drops the plan cache for the incorrect integer type
function_name = Gitlab::Database::UnidirectionalCopyTrigger
.on_table(TABLE_NAME, connection: connection)
.name(:id, :id_convert_to_bigint)
execute "ALTER FUNCTION #{quote_table_name(function_name)} RESET ALL"
# Swap defaults of the two columns, and change ownership of the sequence to the new id
execute "ALTER SEQUENCE notes_id_seq OWNED BY #{TABLE_NAME}.id"
change_column_default TABLE_NAME, :id, -> { "nextval('notes_id_seq'::regclass)" }
change_column_default TABLE_NAME, :id_convert_to_bigint, 0
# Swap the PK constraint from the original column to the new column.
# We deliberately don't CASCADE here because the old FKs should be removed already
execute "ALTER TABLE #{TABLE_NAME} DROP CONSTRAINT notes_pkey"
rename_index TABLE_NAME, PK_INDEX_NAME, 'notes_pkey'
execute "ALTER TABLE #{TABLE_NAME} ADD CONSTRAINT notes_pkey PRIMARY KEY USING INDEX notes_pkey"
# Remove old column indexes and change new column indexes to have the original names
rename_secondary_indexes # rubocop:disable Migration/WithLockRetriesDisallowedMethod
end
end
private
def should_run?
com_or_dev_or_test_but_not_jh?
end
def create_indexes
add_concurrent_index TABLE_NAME, :id_convert_to_bigint, unique: true, name: PK_INDEX_NAME
SECONDARY_INDEXES.each do |index_definition|
options = index_definition[:options]
options[:name] = index_definition[:temporary_name]
add_concurrent_index(TABLE_NAME, index_definition[:columns], options)
end
end
def rename_secondary_indexes
SECONDARY_INDEXES.each do |index_definition|
remove_index(TABLE_NAME, name: index_definition[:original_name], if_exists: true) # rubocop:disable Migration/RemoveIndex
rename_index(TABLE_NAME, index_definition[:temporary_name], index_definition[:original_name])
end
end
def create_referencing_foreign_keys
REFERENCING_FOREIGN_KEYS.each do |(from_table, name, column, on_delete)|
# Don't attempt to create the FK if one already exists from the table to the new column
# The check in `add_concurrent_foreign_key` already checks for this, but it looks for the foreign key
# with the new name only (containing the `_tmp` suffix).
#
# Since we might partially rename FKs and re-run the migration, we also have to check and see if a FK exists
# on those columns that might not match the `_tmp` name.
next if foreign_key_exists?(
from_table, TABLE_NAME, column: column,
primary_key: :id_convert_to_bigint, name: name)
temporary_name = "#{name}_tmp"
add_concurrent_foreign_key(
from_table,
TABLE_NAME,
column: column,
target_column: :id_convert_to_bigint,
name: temporary_name,
on_delete: on_delete,
reverse_lock_order: true)
end
end
def replace_referencing_foreign_keys
REFERENCING_FOREIGN_KEYS.each do |(from_table, name, column, _)|
# Don't attempt to replace the FK unless it exists and points at the original column.
# This could happen if the migration is re-run due to failing midway.
next unless foreign_key_exists?(from_table, TABLE_NAME, column: column, primary_key: :id, name: name)
with_lock_retries(raise_on_exhaustion: true) do
temporary_name = "#{name}_tmp"
# Explicitly lock table in order of parent, child to attempt to avoid deadlocks
execute "LOCK TABLE #{TABLE_NAME}, #{from_table} IN ACCESS EXCLUSIVE MODE"
remove_foreign_key(from_table, TABLE_NAME, column: column, primary_key: :id, name: name)
rename_constraint(from_table, temporary_name, name)
end
end
end
end
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