module ActiveRecord
module Tasks # :nodoc:
class PostgreSQLDatabaseTasks # :nodoc:
DEFAULT_ENCODING = ENV['CHARSET'] || 'utf8'
ON_ERROR_STOP_1 = 'ON_ERROR_STOP=1'.freeze
delegate :connection, :establish_connection, :clear_active_connections!,
to: ActiveRecord::Base
def initialize(configuration)
@configuration = configuration
end
def create(master_established = false)
establish_master_connection unless master_established
connection.create_database configuration['database'],
configuration.merge('encoding' => encoding)
establish_connection configuration
rescue ActiveRecord::StatementInvalid => error
if /database .* already exists/ === error.message
raise DatabaseAlreadyExists
else
raise
end
end
def drop
establish_master_connection
connection.drop_database configuration['database']
end
def charset
connection.encoding
end
def collation
connection.collation
end
def purge
clear_active_connections!
drop
create true
end
def structure_dump(filename)
set_psql_env
search_path = case ActiveRecord::Base.dump_schemas
when :schema_search_path
configuration['schema_search_path']
when :all
nil
when String
ActiveRecord::Base.dump_schemas
end
args = ['-s', '-x', '-O', '-f', filename]
unless search_path.blank?
args += search_path.split(',').map do |part|
"--schema=#{part.strip}"
end
end
args << configuration['database']
run_cmd('pg_dump', args, 'dumping')
File.open(filename, "a") { |f| f << "SET search_path TO #{connection.schema_search_path};\n\n" }
end
def structure_load(filename)
set_psql_env
args = [ '-v', ON_ERROR_STOP_1, '-q', '-f', filename, configuration['database'] ]
run_cmd('psql', args, 'loading' )
end
private
def configuration
@configuration
end
def encoding
configuration['encoding'] || DEFAULT_ENCODING
end
def establish_master_connection
establish_connection configuration.merge(
'database' => 'postgres',
'schema_search_path' => 'public'
)
end
def set_psql_env
ENV['PGHOST'] = configuration['host'] if configuration['host']
ENV['PGPORT'] = configuration['port'].to_s if configuration['port']
ENV['PGPASSWORD'] = configuration['password'].to_s if configuration['password']
ENV['PGUSER'] = configuration['username'].to_s if configuration['username']
end
def run_cmd(cmd, args, action)
fail run_cmd_error(cmd, args, action) unless Kernel.system(cmd, *args)
end
def run_cmd_error(cmd, args, action)
msg = "failed to execute:\n"
msg << "#{cmd} #{args.join(' ')}\n\n"
msg << "Please check the output above for any errors and make sure that `#{cmd}` is installed in your PATH and has proper permissions.\n\n"
msg
end
end
end
end
