openresty lua xpcall exception handler loop is executed

-- require
local result = require "utils.result"


local _M = { _VERSION = '0.01', err_code = "E_0001"}


--[[
-- custom log output, xpcall error handler
-- Operations such as ngx.exit cannot be used in functions
-- @param _errmsg exception information
--]]
function _M.write_error(_errmsg)
    _M.track_text = debug.traceback(tostring(_errmsg), 6)

    ngx.log (ngx.ERR, _M.track_text)
end


-- equal try catch
function _M:trycall(_func)
    xpcall(_func, self.write_error)
    return result:error(_M.err_code, _M.track_text)
end


return _M