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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/.match?(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, extra_flags)
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]
args.concat(Array(extra_flags)) if extra_flags
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, extra_flags)
set_psql_env
args = ["-v", ON_ERROR_STOP_1, "-q", "-f", filename]
args.concat(Array(extra_flags)) if extra_flags
args << 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