记录 Fastify 响应正文

Question

如何在 Fastify 中记录响应正文？主体似乎没有作为响应对象的一部分公开：

const fastify = require('fastify')({
  logger: {
    serializers: {
      res: function (res) { 
        // No body in req afaik
        return {  } 
      }
    }
  }
})

Answer 1

尝试这个：

const fastify = require('fastify')({
  logger: {
    serializers: {
      res: function (res) {
        return {
          statusCode: res.statusCode,
          payload: res.payload,
        }
      },
    }
  }
})

fastify.addHook('onSend', function (_request, reply, payload, next) {
  Object.assign(reply.res, { payload });
  next();
})

如果您的某些有效负载是对象，并且您希望在它们被序列化之前将它们序列化（好吧，序列化），您preSerialization也可以添加钩子：

fastify
  .addHook('preSerialization', (_request, reply, payload, next) => {
    Object.assign(reply.res, { payload });
    next();
  })
  .addHook('onSend', (_request, reply, payload, next) => {
    if (!reply.res.payload) Object.assign(reply.res, { payload });
    next();
  });