不支持connect-session-sequelize的Flash消息

我有一个node.js web应用程序，可在MongoDB和Sequelize（PostgreSQL）之间进行会话切换。对于这两者，我也在连接闪光（也尝试快速闪光）中间件的闪光消息层。总之，MongoDB的工作，Sequelize没有。不支持connect-session-sequelize的Flash消息

该应用程序具有用户可以编辑的“包”的概念。在用户成功编辑包后，我设置了一条闪光消息：

"${timestamp} Package ${pkgID} successfully updated."

和重定向。使用Sequelize（connect-session-sequelize），即使我可以在数据库中看到它，也不会显示该Flash消息，并且如果我刷新该页面，则会出现确实。

这里是Sequelize会话设置：

var cookieParser = require('cookie-parser'); 
var expSession = require('express-session'); 
var flash = require('express-flash'); 

app.use(cookieParser(process.env.COOKIE_SECRET)); 

if (sessionDBVendor === 'postgres') { 
    let models = require('./models/postgres'); 
    var SequelizeSessionStore = require('connect-session-sequelize')(expSession.Store); 
    var sequelizeSessionStore = new SequelizeSessionStore({ 
     db: models.sequelize, 
     table: 'Session' 
    }); 
    sequelizeSessionStore.on('set', function (data) { 
     debug(`SequelizeSessionStore: Session ${data} UPDATED.`); 
    }); 
    app.use(
     expSession({ 
      secret: process.env.COOKIE_SECRET, 
      store: sequelizeSessionStore, 
      resave: false, // we support the touch method so per the express-session docs this should be set to false 
      proxy: false, // if you do SSL outside of node. 
      saveUninitialized: false, 
     }) 
    ); 
} 
app.use(flash());

纵观连接会话，sequelize源代码，我发现，我可以添加“连接：会话sequelize”我的DEBUG环境变量来获得额外的信息在控制台中。以下是控制台日志中有趣的部分，其中包括一些格式，一些空白行和数字。

 connect:session-sequelize INSERT "DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI" +5s 
    Executing (default): SELECT "sid", "userId", "expires", "data", "createdAt", "updatedAt" 
      FROM "webjmp"."sessions" AS "Session" 
      WHERE "Session"."sid" = 'DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI'; 
     connect:session-sequelize SELECT "DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI" +10ms 
    Executing (default): SELECT "sid", "userId", "expires", "data", "createdAt", "updatedAt" 
      FROM "webjmp"."sessions" AS "Session" 
      WHERE "Session"."sid" = 'DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI'; 

(1) 
    Executing (default): UPDATE "webjmp"."sessions" SET "expires"='2017-02-21 15:53:54.738 +00:00', 
      "data"='{"cookie":{"originalMaxAge":null,"expires":null,"httpOnly":true,"path":"/"}, 
       "flash":{"flashSuccess":["{02/20/2017 10:53:49} Package 58a718a0280081343eeab6d9 was successfully updated."]}}', 
      "updatedAt"='2017-02-20 15:53:54.756 +00:00' WHERE "sid" = 'DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI' 

(2) 
     connect:session-sequelize FOUND DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI with data 
     {"cookie":{"originalMaxAge":null,"expires":null,"httpOnly":true,"path":"/"},"flash":{}} +17ms 

    Executing (default): SELECT "Package"."_id", "Package"."title", "Package"."description", 
      {content removed for brevity} 
      FROM "webjmp"."packages" AS "Package" 
      {content removed for brevity} 
      ORDER BY "Package"."timestamp" DESC; 
    ::1 - - [20/Feb/2017:15:53:54 +0000] "POST /packages/58a718a0280081343eeab6d9 HTTP/1.1" 302 62 
     packages ID of package in returned list: 58a718a0280081343eeab6d9 +166ms 
     packages ID of package in returned list: 58a716c35326d0b0380c0b37 +0ms 
     packages ID of package in returned list: 58a474c55c9f18cc31cb0e2a +0ms 
     packages ID of package in returned list: 58a45dfa51f335c015d8591f +0ms 
     packages ID of package in returned list: 589cc7f30a333d1864b07bb2 +0ms 

(3) 
     packages listPackages: flashSuccess: [] +0ms 

     connect:session-sequelize TOUCH "DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI" +92ms 
    Executing (default): UPDATE "webjmp"."sessions" SET "expires"='2017-02-21 15:53:55.023 +00:00', 
      "updatedAt"='2017-02-20 15:53:55.024 +00:00' 
      WHERE "sid" = 'DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI' 
    ::1 - - [20/Feb/2017:15:53:55 +0000] "GET /packages HTTP/1.1" 200 6909 
     connect:session-sequelize SELECT "DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI" +14ms 
    Executing (default): SELECT "sid", "userId", "expires", "data", "createdAt", "updatedAt" 
      FROM "webjmp"."sessions" AS "Session" 
      WHERE "Session"."sid" = 'DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI'; 
     connect:session-sequelize SELECT "DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI" +6ms 
    Executing (default): SELECT "sid", "userId", "expires", "data", "createdAt", "updatedAt" 
      FROM "webjmp"."sessions" AS "Session" WHERE "Session"."sid" = 'DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI'; 

(4) 
     connect:session-sequelize FOUND DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI with data 
      {"cookie":{"originalMaxAge":null,"expires":null,"httpOnly":true,"path":"/"}, 
      "flash":{"flashSuccess":["{02/20/2017 10:53:49} Package 58a718a0280081343eeab6d9 was successfully updated."]}} +3ms

需要注意的是，在（1），更新完成，并在“数据”的更新，“闪”包含的对象：

"flash":{"flashSuccess":["{02/20/2017 10:53:49} Package 58a718a0280081343eeab6d9 was successfully updated."]}

这就是我的提示信息。但是，请注意，在（2），连接会话，sequelize调试吐出来表明它发现会话找到的消息，并在其中显示了会话对象，闪光灯空：只是在这之后

"flash":{}

在（3）处，我的代码尝试检索“flashSuccess”flash消息，但是它出现了一个空数组。但随后，在（4），连接会话，sequelize吐出另一个FOUND调试信息，并在它这其中有闪光灯消息：

"flash":{"flashSuccess":["{02/20/2017 10:53:49} Package 58a718a0280081343eeab6d9 was successfully updated."]}

，如果我检查数据库，它就在那里。

这几乎就像设置Flash消息的UPDATE异步发生，并且在（2）处检索到会话时还没有完成，但随后出现。但是我试着在设置flash消息后抛出一个setTimeout（），但无济于事。

任何想法这里发生了什么？

更新：我添加了第三个会话存储选项，它使用connect-pg-simple中间件将会话存储在PostgreSQL中。使用该选项，Flash消息就可以正常工作。 connect-session-sequelize似乎是一个奇怪的人。

来源

2017-02-20 Eric Hill

在这里回答我自己的问题，但在issues board for connect-session-sequelize上指出express-session在这些flash消息场景中存在竞争条件，并且需要在设置flash消息之后调用req.session.save（cb）返回回调中的回复，以避免出现这种情况。例如：

req.flash('flashError', err.message); 
req.session.save(function() { 
    res.redirect('/packages'); 
});

这样做解决了这个问题。

来源

2017-02-21 19:02:32

不支持connect-session-sequelize的Flash消息

回答

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