代码之家 › 专栏 › 技术社区 › Jonas Raphael Schultheiss

承诺链接,使用另一个请求的结果

es6-promise node.js javascript

Jonas Raphael Schultheiss · 技术社区 · 6 年前

我在node.js中使用ES6。长话短说,我现在只想回电话,并希望以承诺取代他们。

我做了一个测试项目,从api/端点获取oauth2令牌,刷新它,最后撤销它。目标是,将上一个请求的响应提供给下一个请求。我的代码如下所示:

const oauth2Adapter = require('./api/adapter/oauth2Adapter')

function test () {
oauth2Adapter.RequestNewAccessToken()
.then(function (response) {
  console.log(response)
  return oauth2Adapter.RefreshAccessToken(response.body)
})
.then(function (response) {
  return oauth2Adapter.RevokeAccessToken(response.body)
})
.then(console.log)
.catch(console.log)
}

test()

第一个承诺会回报它的回应。下一步是将它作为参数赋给第二个promise。但第二个承诺只接受一个未定义的对象。

编辑:添加“return”关键字并没有改变这种情况。问题是“RefreshAccessToken”“undefined”接收到。我也不知道这是否有帮助,但下面是'oauth2Adapter.js'代码:

const Promise = require('promise')
const rp = require('request-promise')
const credentials = require('../../misc/credentials/Staging')

function RequestNewAccessToken () {
  try {
    const response = rp({
      method: 'POST',
      url: `${credentials.baseUrl}/oauth/token`,
      form: {
        client_id: credentials.apiKey,
        client_secret: credentials.apiSecret,
        username: credentials.username,
        password: credentials.password,
        grant_type: credentials.grantType
      },
      json: true
    })
    return Promise.resolve(response)
  } catch (error) {
    return Promise.reject(error)
  }
}

function RefreshAccessToken (token) {
  try {
    const response = rp({
      method: 'POST',
      url: `${credentials.baseUrl}/oauth/token`,
      form: {
        client_id: credentials.apiKey,
        client_secret: credentials.apiSecret,
        grant_type: 'refresh_token',
        refresh_token: token.refresh_token
      },
      json: true
    })
    return Promise.resolve(response)
  } catch (error) {
    return Promise.reject(error)
  }
}

function RevokeAccessToken (token) {
  try {
    const response = rp({
      method: 'POST',
      url: `${credentials.baseUrl}/oauth/revoke`,
      form: {
        client_id: credentials.apiKey,
        client_secret: credentials.apiSecret,
        token: token.access_token
      },
      json: true
    })
    return Promise.resolve(response)
  } catch (error) {
    return Promise.reject(error)
  }
}

module.exports = { RequestNewAccessToken, RefreshAccessToken, RevokeAccessToken }

如果执行代码,则通过stdout获得以下文本:

Debugger attached.

    { access_token: '31744bf03a2fb92edb67fcbeead14f4ed8c540843c2439179a54b6439dc94c0e',
      token_type: 'Bearer',
      expires_in: 660,
      refresh_token: 'e53642c69bd0ad954d886dad7a437f88c8c269ecacf2cdcfebc8af1a2d0d9b1e',
      created_at: 1538471914 }
    TypeError: Cannot read property 'refresh_token' of undefined
        at Object.RefreshAccessToken (/Users/quest1onmark/coding_stuff/nodejs/EdgeDeviceAdministration/api/adapter/oauth2Adapter.js:28:28)
        at /Users/quest1onmark/coding_stuff/nodejs/EdgeDeviceAdministration/Main.js:7:28
        at tryCatcher (/Users/quest1onmark/coding_stuff/nodejs/EdgeDeviceAdministration/node_modules/bluebird/js/release/util.js:16:23)
        at Promise._settlePromiseFromHandler (/Users/quest1onmark/coding_stuff/nodejs/EdgeDeviceAdministration/node_modules/bluebird/js/release/promise.js:512:31)
        at Promise._settlePromise (/Users/quest1onmark/coding_stuff/nodejs/EdgeDeviceAdministration/node_modules/bluebird/js/release/promise.js:569:18)
        at Promise._settlePromise0 (/Users/quest1onmark/coding_stuff/nodejs/EdgeDeviceAdministration/node_modules/bluebird/js/release/promise.js:614:10)
        at Promise._settlePromises (/Users/quest1onmark/coding_stuff/nodejs/EdgeDeviceAdministration/node_modules/bluebird/js/release/promise.js:694:18)
        at _drainQueueStep (/Users/quest1onmark/coding_stuff/nodejs/EdgeDeviceAdministration/node_modules/bluebird/js/release/async.js:138:12)
        at _drainQueue (/Users/quest1onmark/coding_stuff/nodejs/EdgeDeviceAdministration/node_modules/bluebird/js/release/async.js:131:9)
        at Async._drainQueues (/Users/quest1onmark/coding_stuff/nodejs/EdgeDeviceAdministration/node_modules/bluebird/js/release/async.js:147:5)
        at Immediate.Async.drainQueues (/Users/quest1onmark/coding_stuff/nodejs/EdgeDeviceAdministration/node_modules/bluebird/js/release/async.js:17:14)
        at runCallback (timers.js:810:20)
        at tryOnImmediate (timers.js:768:5)
        at processImmediate [as _immediateCallback] (timers.js:745:5)
    Waiting for the debugger to disconnect...

    Process finished with exit code 0

3 回复 | 直到 6 年前

Jaromanda X 6 年前

请尝试以下操作

const Promise = require('promise')
const rp = require('request-promise')
const credentials = require('../../misc/credentials/Staging')

function RequestNewAccessToken () {
    return rp({
      method: 'POST',
      url: `${credentials.baseUrl}/oauth/token`,
      form: {
        client_id: credentials.apiKey,
        client_secret: credentials.apiSecret,
        username: credentials.username,
        password: credentials.password,
        grant_type: credentials.grantType
      },
      json: true
    });
}

function RefreshAccessToken (token) {
    return rp({
      method: 'POST',
      url: `${credentials.baseUrl}/oauth/token`,
      form: {
        client_id: credentials.apiKey,
        client_secret: credentials.apiSecret,
        grant_type: 'refresh_token',
        refresh_token: token.refresh_token
      },
      json: true
    });
}

function RevokeAccessToken (token) {
    return rp({
      method: 'POST',
      url: `${credentials.baseUrl}/oauth/revoke`,
      form: {
        client_id: credentials.apiKey,
        client_secret: credentials.apiSecret,
        token: token.access_token
      },
      json: true
    });
}

module.exports = { RequestNewAccessToken, RefreshAccessToken, RevokeAccessToken }

至于你使用这个的代码-你 console.log(response) oauth2Adapter.RefreshAccessToken(response.body) ... 回应没有身体!

所以,只要做:

const oauth2Adapter = require('./api/adapter/oauth2Adapter')
function test () {
    return oauth2Adapter.RequestNewAccessToken()
    .then(response => oauth2Adapter.RefreshAccessToken(response))
    .then(response => oauth2Adapter.RevokeAccessToken(response))
    .then(console.log)
    .catch(console.log)
}
test()

但是,既然你过去了 response

const oauth2Adapter = require('./api/adapter/oauth2Adapter')
function test () {
    return oauth2Adapter.RequestNewAccessToken()
    .then(oauth2Adapter.RefreshAccessToken)
    .then(oauth2Adapter.RevokeAccessToken)
    .then(console.log)
    .catch(console.log)
}
test()

shinglesmingles 6 年前

then return 然后

oauth2Adapter.RequestNewAccessToken()
.then(function (requestReponse) {
  console.log(response)
  return oauth2Adapter.RefreshAccessToken()
})
.then(function (refreshResponse) {
  return oauth2Adapter.RevokeAccessToken(JSON.parse(refreshResponse.body))
})

Estus Flask 6 年前

承诺应该恰当锁链 then 和 catch 回调应该返回对chain的承诺,以防有承诺。

也, response json: true

...
.then(function (response) {
  console.log(response)
  return oauth2Adapter.RefreshAccessToken(response)
})
...