[session-file-store] will retry, error on last attempt: Error: ENOENT: no such file or directory

[visuallization]

Hey there,

I get the above mentioned error, everytime I call:

req.session.regenerate(async () => {
  // update session
  
  return res.redirect(req.path);
});

This is my session:

app.use(session({
  store: new FileStorage({
    path: sessionDir,
  }),
  secret: "some secret",
  saveUninitialized: true,
  resave: true,
}));

The thing is, that it looks like it tries to access the new file before it was created, because the missing file is always created shortly after the warning. Is this a race condition? What would be the best way to handle this?

[ChrisMBarr]

I am also getting this all of a sudden. I have an Express server that has been working fine for me locally, but all of a sudden I am getting these errors and usually the files are NOT created for me, but on a rare occasion they are. This also makes me think it's a race condition as mentioned above.

[Tsenzuk]

I'm facing same issue on Windows environment, while the library works smoothly on Linux

I've found recommendation to update transition dependency of write-file-atomic here #41 (comment) but no success with any version, including recommended ^6.0.0 that contains promisified way to write files

Looks like the issues is in that each time when express request interacts with session, it calls .touch() function of the session-file-store that updates __lastAccess time and corresponding cookie lifetime. Also, this .touch() function reads and writes session file. Race condition happens if there are several simultaneous requests that tries to update same session file in file system. Looks like it works perfectly in Linux environment, but causes ENOENT error on Windows

My workaround is to make the .touch() function debounced using private __lastAccess value:

const express = require('express');
const app = express();

const expressSession = require('express-session');
const FileStore = require('session-file-store')(expressSession);

const fileStoreTouchFunction = FileStore.prototype.touch;

FileStore.prototype.touch = function(sessionId, session, callback) {
  if (new Date() - session.__lastAccess < 100) {
    return callback();
  }

  fileStoreTouchFunction.call(this, sessionId, session, callback);
};

app.use(
  expressSession({
    store: new FileStore({}),
    resave: false,
    saveUninitialized: true,
  })
);