From 7d180ee89cf3a23b8646108501913f55a9aefec3 Mon Sep 17 00:00:00 2001 From: Claire Date: Fri, 19 Mar 2021 13:14:40 +0100 Subject: [PATCH] Remove MySQL-specific code from Mastodon::MigrationHelpers (#15924) Mastodon::MigrationHelpers has been forked from Gitlab a long time ago, but Mastodon has never supported using a MySQL database. Removing MySQL support from Mastodon::MigrationHelpers makes it a little easier to maintain. In particular, it removes code that would need updating with Rails 6. --- lib/mastodon/migration_helpers.rb | 84 ++++++------------------------- 1 file changed, 14 insertions(+), 70 deletions(-) diff --git a/lib/mastodon/migration_helpers.rb b/lib/mastodon/migration_helpers.rb index fcaa9259e3..147642a1cc 100644 --- a/lib/mastodon/migration_helpers.rb +++ b/lib/mastodon/migration_helpers.rb @@ -41,42 +41,18 @@ module Mastodon module MigrationHelpers - # Stub for Database.postgresql? from GitLab - def self.postgresql? - ActiveRecord::Base.configurations[Rails.env]['adapter'].casecmp('postgresql').zero? - end - - # Stub for Database.mysql? from GitLab - def self.mysql? - ActiveRecord::Base.configurations[Rails.env]['adapter'].casecmp('mysql2').zero? - end - # Model that can be used for querying permissions of a SQL user. class Grant < ActiveRecord::Base - self.table_name = - if Mastodon::MigrationHelpers.postgresql? - 'information_schema.role_table_grants' - else - 'mysql.user' - end + self.table_name = 'information_schema.role_table_grants' def self.scope_to_current_user - if Mastodon::MigrationHelpers.postgresql? - where('grantee = user') - else - where("CONCAT(User, '@', Host) = current_user()") - end + where('grantee = user') end # Returns true if the current user can create and execute triggers on the # given table. def self.create_and_execute_trigger?(table) - priv = - if Mastodon::MigrationHelpers.postgresql? - where(privilege_type: 'TRIGGER', table_name: table) - else - where(Trigger_priv: 'Y') - end + priv = where(privilege_type: 'TRIGGER', table_name: table) priv.scope_to_current_user.any? end @@ -141,10 +117,8 @@ module Mastodon 'in the body of your migration class' end - if MigrationHelpers.postgresql? - options = options.merge({ algorithm: :concurrently }) - disable_statement_timeout - end + options = options.merge({ algorithm: :concurrently }) + disable_statement_timeout add_index(table_name, column_name, options) end @@ -199,8 +173,6 @@ module Mastodon # Only available on Postgresql >= 9.2 def supports_drop_index_concurrently? - return false unless MigrationHelpers.postgresql? - version = select_one("SELECT current_setting('server_version_num') AS v")['v'].to_i version >= 90200 @@ -226,13 +198,7 @@ module Mastodon # While MySQL does allow disabling of foreign keys it has no equivalent # of PostgreSQL's "VALIDATE CONSTRAINT". As a result we'll just fall # back to the normal foreign key procedure. - if MigrationHelpers.mysql? - return add_foreign_key(source, target, - column: column, - on_delete: on_delete) - else - on_delete = 'SET NULL' if on_delete == :nullify - end + on_delete = 'SET NULL' if on_delete == :nullify disable_statement_timeout @@ -270,7 +236,7 @@ module Mastodon # the database. Disable the session's statement timeout to ensure # migrations don't get killed prematurely. (PostgreSQL only) def disable_statement_timeout - execute('SET statement_timeout TO 0') if MigrationHelpers.postgresql? + execute('SET statement_timeout TO 0') end # Updates the value of a column in batches. @@ -487,11 +453,7 @@ module Mastodon # If we were in the middle of update_column_in_batches, we should remove # the old column and start over, as we have no idea where we were. if column_for(table, new) - if MigrationHelpers.postgresql? - remove_rename_triggers_for_postgresql(table, trigger_name) - else - remove_rename_triggers_for_mysql(trigger_name) - end + remove_rename_triggers_for_postgresql(table, trigger_name) remove_column(table, new) end @@ -521,13 +483,8 @@ module Mastodon quoted_old = quote_column_name(old) quoted_new = quote_column_name(new) - if MigrationHelpers.postgresql? - install_rename_triggers_for_postgresql(trigger_name, quoted_table, - quoted_old, quoted_new) - else - install_rename_triggers_for_mysql(trigger_name, quoted_table, - quoted_old, quoted_new) - end + install_rename_triggers_for_postgresql(trigger_name, quoted_table, + quoted_old, quoted_new) update_column_in_batches(table, new, Arel::Table.new(table)[old]) @@ -685,11 +642,7 @@ module Mastodon check_trigger_permissions!(table) - if MigrationHelpers.postgresql? - remove_rename_triggers_for_postgresql(table, trigger_name) - else - remove_rename_triggers_for_mysql(trigger_name) - end + remove_rename_triggers_for_postgresql(table, trigger_name) remove_column(table, old) end @@ -844,18 +797,9 @@ module Mastodon quoted_pattern = Arel::Nodes::Quoted.new(pattern.to_s) quoted_replacement = Arel::Nodes::Quoted.new(replacement.to_s) - if MigrationHelpers.mysql? - locate = Arel::Nodes::NamedFunction - .new('locate', [quoted_pattern, column]) - insert_in_place = Arel::Nodes::NamedFunction - .new('insert', [column, locate, pattern.size, quoted_replacement]) - - Arel::Nodes::SqlLiteral.new(insert_in_place.to_sql) - else - replace = Arel::Nodes::NamedFunction - .new("regexp_replace", [column, quoted_pattern, quoted_replacement]) - Arel::Nodes::SqlLiteral.new(replace.to_sql) - end + replace = Arel::Nodes::NamedFunction + .new("regexp_replace", [column, quoted_pattern, quoted_replacement]) + Arel::Nodes::SqlLiteral.new(replace.to_sql) end def remove_foreign_key_without_error(*args)