Javascript NodeJS Bluebird promise在处理程序中创建,但未从中返回
我有以下nodejs代码作为快速中间件函数Javascript NodeJS Bluebird promise在处理程序中创建,但未从中返回,javascript,node.js,express,promise,bluebird,Javascript,Node.js,Express,Promise,Bluebird,我有以下nodejs代码作为快速中间件函数 Middleware.is_authenticated = function(req, res, next) { if(req.system_session == undefined || req.system_session.login_status == false) return res.status(401).send({errors: true, error: 'invalid_session', session: req.syste
Middleware.is_authenticated = function(req, res, next)
{
if(req.system_session == undefined || req.system_session.login_status == false) return res.status(401).send({errors: true, error: 'invalid_session', session: req.system_session}).end();
Session.validate_session(req.system_session, req.ip, req.headers['user-agent'])
.then(function(session)
{
return next();
})
.catch(function(err)
{
req.system_session.destroy();
return res.status(401).send({errors: true, error: err.message, session: req.system_session}).end();
});
};
My Session.validate_会话代码:
Session.validate_session = function(user, user_ip, user_agent)
{
return new Promise(function(resolve, reject)
{
if(user.user_id == null || user.user_name == null || user.user_rank == null || user.user_session == null || user_ip == null || user_agent == null) return reject(new Error('invalid_session'));
new api_session({user_session: user.user_session}).fetch({columns: ['user_id', 'user_name', 'user_rank', 'user_session', 'user_ip', 'user_agent']})
.then(function(result)
{
if(result == null) return reject(new Error('invalid_session'));
return result.toJSON();
})
.then(function(session)
{
if(session == null || session.user_id != user.user_id || session.user_name != user.user_name || session.user_rank != user.user_rank || session.user_ip != user_ip || session.user_agent != user_agent) return reject(new Error('invalid_session'));
return resolve(session);
})
.catch(function(err)
{
return reject(err);
});
});
};
一切都正常工作,数据库中的一切都在完美地执行,解决“下一个”路由,甚至显示响应。但无论我做了什么尝试,我都会不断得到“承诺是在处理程序中创建的,但没有从中返回”
Warning: a promise was created in a handler at middleware.js:12:11 but was not returned from it
at new Promise (/Users/Bill/Documents/app/node_modules/bluebird/js/release/promise.js:77:14)
at Object.Permission.permission_list (/Users/Bill/Documents/app/app/security/permission.js:8:10)
at PermissionService.permission_list (/Users/Bill/Documents/app/app/http/services/permission_service.js:6:14)
at Layer.handle [as handle_request] (/Users/Bill/Documents/app/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/Bill/Documents/app/node_modules/express/lib/router/route.js:131:13)
at /Users/Bill/Documents/app/app/http/middleware.js:12:11
at processImmediate [as _immediateCallback] (timers.js:383:17)
From previous event:
at Middleware.is_authenticated (/Users/Bill/Documents/app/app/http/middleware.js:10:4)
at Layer.handle [as handle_request] (/Users/Bill/Documents/app/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/Bill/Documents/app/node_modules/express/lib/router/route.js:131:13)
at Route.dispatch (/Users/Bill/Documents/app/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/Users/Bill/Documents/app/node_modules/express/lib/router/layer.js:95:5)
at /Users/Bill/Documents/app/node_modules/express/lib/router/index.js:277:22
at Function.process_params (/Users/Bill/Documents/app/node_modules/express/lib/router/index.js:330:12)
at next (/Users/Bill/Documents/app/node_modules/express/lib/router/index.js:271:10)
at clientSession (/Users/Bill/Documents/app/node_modules/client-sessions/lib/client-sessions.js:630:5)
at Layer.handle [as handle_request] (/Users/Bill/Documents/app/node_modules/express/lib/router/layer.js:95:5)
at trim_prefix (/Users/Bill/Documents/app/node_modules/express/lib/router/index.js:312:13)
at /Users/Bill/Documents/app/node_modules/express/lib/router/index.js:280:7
at Function.process_params (/Users/Bill/Documents/app/node_modules/express/lib/router/index.js:330:12)
at next (/Users/Bill/Documents/app/node_modules/express/lib/router/index.js:271:10)
at SendStream.error (/Users/Bill/Documents/app/node_modules/express/node_modules/serve-static/index.js:121:7)
at emitOne (events.js:77:13)
at SendStream.emit (events.js:169:7)
at SendStream.error (/Users/Bill/Documents/app/node_modules/express/node_modules/send/index.js:275:17)
at SendStream.onStatError (/Users/Bill/Documents/app/node_modules/express/node_modules/send/index.js:392:12)
如果有人有任何解决方案,那就太好了。在我的项目中,我有很多承诺,这些承诺都非常相似,而且都非常有效,但我就是无法理解这一点。这是基于承诺的代码(
Session.validate\u Session
)与基于回调的代码(next
)的混合。可以预期,next()
调用不是异步的(不创建任何承诺),或者返回该承诺,而它不是异步的(责怪express)
有两种方法可以避免警告:
- 让express执行错误处理,如果出现错误,则调用
。在这种情况下,您可以使用:next
- 如上所述,您可以显式地
,而不是返回返回null
未定义的
值,
产生:next()
Middleware.is_authenticated = function(req, res, next) { if (req.system_session == undefined || req.system_session.login_status == false) var promise = Promise.reject(new Error('invalid_session')); else var promise = Session.validate_session(req.system_session, req.ip, req.headers['user-agent']) .catch(function(err) { req.system_session.destroy(); throw err; }); promise.then(function(session) { next(); return null; }, function(err) { res.status(401).send({errors: true, error: err.message, session: req.system_session}).end(); }); };
- 这是基于承诺的代码(
会话。验证会话
)与基于回调的代码(下一步
)的混合。可以预期,next()
调用不是异步的(不创建任何承诺),或者返回该承诺,而它不是异步的(责怪express)
有两种方法可以避免警告:
- 让express执行错误处理,如果出现错误,则调用
。在这种情况下,您可以使用:next
- 如上所述,您可以显式地
,而不是返回返回null
未定义的
值,
产生:next()
Middleware.is_authenticated = function(req, res, next) { if (req.system_session == undefined || req.system_session.login_status == false) var promise = Promise.reject(new Error('invalid_session')); else var promise = Session.validate_session(req.system_session, req.ip, req.headers['user-agent']) .catch(function(err) { req.system_session.destroy(); throw err; }); promise.then(function(session) { next(); return null; }, function(err) { res.status(401).send({errors: true, error: err.message, session: req.system_session}).end(); }); };
返回下一步()代码>?我真的很想知道为什么在validate_会话
第12行是return next()代码>?我真想知道为什么您没有收到有关invalidate\u会话的警告