Meteor 的节点光纤故障

Question

我正在尝试为 Meteor 编写一个简单的身份验证后端，该后端针对 LDAP 服务器进行身份验证。我需要注册为登录处理程序的函数（Accounts.registerLoginHandler 的输入）来返回刚刚登录的用户的id。

我认为问题在于我创建的 Fiber getUserId，它没有像我想要的那样返回 id。我知道它必须在光纤中，否则流星会​​生气并引发错误。即使yield 之前的日志显示id 不是未定义的，getUserId.run() 始终返回未定义。

任何帮助将不胜感激，谢谢！

Accounts.registerLoginHandler(function(loginRequest) { 

    console.log("In login handler");

    return auth.authenticate(loginRequest.username, loginRequest.password, function(err, ldap_user) {

        if (err){
            // ldap authentications was failed
            console.log("Login failed");
            return undefined;
        }
        else {
            // authentication was successful
            console.log("Login success");

            // extracting team name from ldap record
            var equals = ldap_user.memberOf.indexOf("=");
            var comma = ldap_user.memberOf.indexOf(",");
            var team_name = ldap_user.memberOf.slice(equals+1,comma);

            // add user if they don't already exist

            var getUserId = Fiber( function() { // Meteor code must be ran within a fiber
                var id = null;
                var user = Meteor.users.findOne({username: loginRequest.username});
                if(!user) {

                    // insert user and kick back id
                    id = Meteor.users.insert({username: loginRequest.username,
                                              profile : {team : team_name}
                                             });
                    console.log('no user found, creating' + id);

                } else { 

                    id = user._id; 
                    console.log('user found, returning id' + id);

                }

                console.log('id: '+id);
                Fiber.yield(id);  // return id
            });

            // send logged in users if by executing the fiber
            return {id: getUserId.run()};
        }
    });
});

Answer 1

我认为问题与需要使用Meteor.bindEnvironment 来控制（环境）变量和正在使用的纤维的范围有关。

这里有一个很好的关于这个主题的三步教程：

1. https://www.eventedmind.com/feed/nodejs-introducing-fibers
2. https://www.eventedmind.com/feed/meteor-dynamic-scoping-with-environment-variables
3. https://www.eventedmind.com/feed/meteor-what-is-meteor-bindenvironment

我对您的代码的看法是这样的（在类似的问题中对我有用）：

Accounts.registerLoginHandler(function(loginRequest) { 

    console.log("In login handler");

    var boundAuthenticateFunction = Meteor.bindEnvironment(function(err, ldap_user) {
        if (err){
            // ldap authentications was failed
            console.log("Login failed");
            return undefined;
        }
        else {
            // authentication was successful
            console.log("Login success");

            // extracting team name from ldap record
            var equals = ldap_user.memberOf.indexOf("=");
            var comma = ldap_user.memberOf.indexOf(",");
            var team_name = ldap_user.memberOf.slice(equals+1,comma);

            // add user if they don't already exist

            var id = null;
            var user = Meteor.users.findOne({username: loginRequest.username});
            if(!user) {

                // insert user and kick back id
                id = Meteor.users.insert({username: loginRequest.username,
                                          profile : {team : team_name}
                                         });
                console.log('no user found, creating' + id);

            } else { 

                id = user._id; 
                console.log('user found, returning id' + id);

            }

            console.log('id: '+id);

            return {id: id};
        }
    }, function(e){throw e;});

  return auth.authenticate(loginRequest.username, loginRequest.password, boundAuthenticateFunction);
});

请注意，上面的代码示例未经测试...