diff options
Diffstat (limited to 'lib/gitlab/database/migration_helpers.rb')
| -rw-r--r-- | lib/gitlab/database/migration_helpers.rb | 138 |
1 files changed, 21 insertions, 117 deletions
diff --git a/lib/gitlab/database/migration_helpers.rb b/lib/gitlab/database/migration_helpers.rb index 2ae807697bc..4bd09163bf2 100644 --- a/lib/gitlab/database/migration_helpers.rb +++ b/lib/gitlab/database/migration_helpers.rb @@ -68,10 +68,7 @@ module Gitlab end end - # Creates a new index, concurrently when supported - # - # On PostgreSQL this method creates an index concurrently, on MySQL this - # creates a regular index. + # Creates a new index, concurrently # # Example: # @@ -85,9 +82,7 @@ module Gitlab 'in the body of your migration class' end - if Database.postgresql? - options = options.merge({ algorithm: :concurrently }) - end + options = options.merge({ algorithm: :concurrently }) if index_exists?(table_name, column_name, options) Rails.logger.warn "Index not created because it already exists (this may be due to an aborted migration or similar): table_name: #{table_name}, column_name: #{column_name}" # rubocop:disable Gitlab/RailsLogger @@ -99,9 +94,7 @@ module Gitlab end end - # Removes an existed index, concurrently when supported - # - # On PostgreSQL this method removes an index concurrently. + # Removes an existed index, concurrently # # Example: # @@ -129,9 +122,7 @@ module Gitlab end end - # Removes an existing index, concurrently when supported - # - # On PostgreSQL this method removes an index concurrently. + # Removes an existing index, concurrently # # Example: # @@ -170,8 +161,7 @@ module Gitlab # Adds a foreign key with only minimal locking on the tables involved. # - # This method only requires minimal locking when using PostgreSQL. When - # using MySQL this method will use Rails' default `add_foreign_key`. + # This method only requires minimal locking # # source - The source table containing the foreign key. # target - The target table the key points to. @@ -187,27 +177,7 @@ module Gitlab raise 'add_concurrent_foreign_key can not be run inside a transaction' end - # 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 Database.mysql? - if foreign_key_exists?(source, target, column: column) - Rails.logger.warn "Foreign key not created because it exists already " \ - "(this may be due to an aborted migration or similar): " \ - "source: #{source}, target: #{target}, column: #{column}" - return - end - - key_options = { column: column, on_delete: on_delete } - - # The MySQL adapter tries to create a foreign key without a name when - # `:name` is nil, instead of generating a name for us. - key_options[:name] = name if name - - return add_foreign_key(source, target, key_options) - else - on_delete = 'SET NULL' if on_delete == :nullify - end + on_delete = 'SET NULL' if on_delete == :nullify key_name = name || concurrent_foreign_key_name(source, column) @@ -265,7 +235,7 @@ module Gitlab # Long-running migrations may take more than the timeout allowed by # the database. Disable the session's statement timeout to ensure - # migrations don't get killed prematurely. (PostgreSQL only) + # migrations don't get killed prematurely. # # There are two possible ways to disable the statement timeout: # @@ -277,15 +247,6 @@ module Gitlab # otherwise the statement will still be disabled until connection is dropped # or `RESET ALL` is executed def disable_statement_timeout - # bypass disabled_statement logic when not using postgres, but still execute block when one is given - unless Database.postgresql? - if block_given? - yield - end - - return - end - if block_given? begin execute('SET statement_timeout TO 0') @@ -535,13 +496,12 @@ module Gitlab quoted_old = quote_column_name(old_column) quoted_new = quote_column_name(new_column) - if Database.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 + ) end # Changes the type of a column concurrently. @@ -584,11 +544,7 @@ module Gitlab check_trigger_permissions!(table) - if Database.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 @@ -801,38 +757,12 @@ module Gitlab EOF end - # Installs the triggers necessary to perform a concurrent column rename on - # MySQL. - def install_rename_triggers_for_mysql(trigger, table, old, new) - execute <<-EOF.strip_heredoc - CREATE TRIGGER #{trigger}_insert - BEFORE INSERT - ON #{table} - FOR EACH ROW - SET NEW.#{new} = NEW.#{old} - EOF - - execute <<-EOF.strip_heredoc - CREATE TRIGGER #{trigger}_update - BEFORE UPDATE - ON #{table} - FOR EACH ROW - SET NEW.#{new} = NEW.#{old} - EOF - end - # Removes the triggers used for renaming a PostgreSQL column concurrently. def remove_rename_triggers_for_postgresql(table, trigger) execute("DROP TRIGGER IF EXISTS #{trigger} ON #{table}") execute("DROP FUNCTION IF EXISTS #{trigger}()") end - # Removes the triggers used for renaming a MySQL column concurrently. - def remove_rename_triggers_for_mysql(trigger) - execute("DROP TRIGGER IF EXISTS #{trigger}_insert") - execute("DROP TRIGGER IF EXISTS #{trigger}_update") - end - # Returns the (base) name to use for triggers when renaming columns. def rename_trigger_name(table, old, new) 'trigger_' + Digest::SHA256.hexdigest("#{table}_#{old}_#{new}").first(12) @@ -882,8 +812,6 @@ module Gitlab order: index.orders } - # These options are not supported by MySQL, so we only add them if - # they were previously set. options[:using] = index.using if index.using options[:where] = index.where if index.where @@ -923,26 +851,16 @@ module Gitlab end # This will replace the first occurrence of a string in a column with - # the replacement - # On postgresql we can use `regexp_replace` for that. - # On mysql we find the location of the pattern, and overwrite it - # with the replacement + # the replacement using `regexp_replace` def replace_sql(column, pattern, replacement) quoted_pattern = Arel::Nodes::Quoted.new(pattern.to_s) quoted_replacement = Arel::Nodes::Quoted.new(replacement.to_s) - if Database.mysql? - locate = Arel::Nodes::NamedFunction - .new('locate', [quoted_pattern, column]) - insert_in_place = Arel::Nodes::NamedFunction - .new('insert', [column, locate, pattern.size, quoted_replacement]) + replace = Arel::Nodes::NamedFunction.new( + "regexp_replace", [column, quoted_pattern, 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 + Arel::Nodes::SqlLiteral.new(replace.to_sql) end def remove_foreign_key_if_exists(*args) @@ -984,11 +902,7 @@ database (#{dbname}) using a super user and running: ALTER #{user} WITH SUPERUSER -For MySQL you instead need to run: - - GRANT ALL PRIVILEGES ON #{dbname}.* TO #{user}@'%' - -Both queries will grant the user super user permissions, ensuring you don't run +This query will grant the user super user permissions, ensuring you don't run into similar problems in the future (e.g. when new tables are created). EOF end @@ -1091,10 +1005,6 @@ into similar problems in the future (e.g. when new tables are created). # This will include indexes using an expression on the column, for example: # `CREATE INDEX CONCURRENTLY index_name ON table (LOWER(column));` # - # For mysql, it falls back to the default ActiveRecord implementation that - # will not find custom indexes. But it will select by name without passing - # a column. - # # We can remove this when upgrading to Rails 5 with an updated `index_exists?`: # - https://github.com/rails/rails/commit/edc2b7718725016e988089b5fb6d6fb9d6e16882 # @@ -1105,10 +1015,8 @@ into similar problems in the future (e.g. when new tables are created). # does not find indexes without passing a column name. if indexes(table).map(&:name).include?(index.to_s) true - elsif Gitlab::Database.postgresql? - postgres_exists_by_name?(table, index) else - false + postgres_exists_by_name?(table, index) end end @@ -1124,10 +1032,6 @@ into similar problems in the future (e.g. when new tables are created). connection.select_value(index_sql).to_i > 0 end - def mysql_compatible_index_length - Gitlab::Database.mysql? ? 20 : nil - end - private def validate_timestamp_column_name!(column_name) |