如何使用Bluebird.js nodeify将第三个参数传递给回调 [英] How to pass a third argument to a callback using Bluebird.js nodeify
问题描述
在一点帮助下我已经找到了以下代码来说明 passport.js登录策略.
With a little help I've arrived at the following code to promisify a passport.js login strategy.
var passport = require('passport');
var LocalStrategy = require('passport-local').Strategy;
var Promise = require('bluebird');
var bcrypt = require('bcrypt');
var db = require('./db').db; //users are stored in mongo
//I'm using bluebird.js for promises
var users = Promise.promisifyAll(db.users);
var compare = Promise.promisify(bcrypt.compare);
// This strategy is used by passport to handle logins
module.exports.localStrategy = new LocalStrategy(function(username, password, done) {
users.findOneAsync({username: username}).bind({})
.then(function(user) {
if (!user) {
throw new NoMatchedUserError('Incorrect username.');
//should be equivalent to:
// return done(null, false, {message:'something'});
}
this.user = user;
return compare(password, user.password);
})
.then(function(isMatch) {
if (isMatch) {
return this.user;
//is equivalent to:
// return done(null, this.user);
}
else {
throw { message: 'Incorrect password.' };
//should be equivalent to:
// return done(null, false, {message:'something else'};
}
})
.nodeify(done);
});
通过调用 nodeify(done)我可以处理密码匹配的路径,但是我不知道如何传递可选的第三个参数,以便passport.js可以使用它.
by calling nodeify(done) I can handle the path where passwords match but I don't know how to pass the optional third parameter out so that passport.js can use it.
是否可以处理两条故障(非错误)路径?
Is it possible to have the two failure (not error) paths handled?
更新:
根据评论中的要求,我在Github上创建了一个问题,并且在Bluebird v2.0中(非常迅速地)添加了此功能
As asked in the comments I created an issue on Github and this feature was (very promptly) added in Bluebird v2.0
https://github.com/petkaantonov/bluebird/issues/219
推荐答案
当前,无法使用.nodeify
进行此操作,当然可以使用.then
手动进行此操作:
Currently, there is no way to do it with .nodeify
, you can of course do it manually with .then
:
.then(function(result){
done(/*whatever arguments you need*/);
},function(failure){
done(/* failure argumnets */);
});
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