Question

当我发布到服务器时，无论我给出auth函数的信息，它都返回true。我的预感是我试图同步做一些事情，这本质上是异步的，但我不知道如何修复它。

auth = (username, api_key, device) ->
  hashed_key = hash.sha256(username + api_key + device, salt) 
  winston.debug('Checking auth for ' + username)
  redis_client.get hashed_key, (err, data) ->
    if data == username
        true

# Main Handler for posting data for a device.
server.post "/:customer/:site/:device", create = (req, res, next) ->
    message = JSON.parse(req.body)
    winston.info(server.name + ': Recieved event from ' + req.params.device)
    authenticated = auth(message.username, message.api_key, message.device)
    winston.debug('****' + authenticated)
    if authenticated == true 
        winston.debug('Auth passed, got a valid user/device/api combination: ' + message.username)
        redis_client.publish('device_events', req.body)
        return next()
    else
        winston.debug('Auth failed, cant find device ' + message.device + ' for ' + message.username)
        return next(restify.NotAuthorizedError)

Answer 1

如果您知道（或有预感）某些东西是异步的，那么您应该将其后的内容作为回调函数传递。我不确定你的服务器的post函数是如何工作的，不过如果它像Node HTTP's request那样你应该做如下的事情：

get = (location, callback, retriever, filterer, formatter)->
  decoratedCallback = (data)->
    callback formatter.applyFormat filterer.applyFilter data
  retriever.retrieve location, decoratedCallback

module.exports = get

为什么这个coffeescript代码总是返回true？

1 个答案: