Implement session store based on MongoDB

[cgossain]

Uses the official MongoDB driver for Go. https://github.com/mongodb/mongo-go-driver

I used the other stores as a reference.

[alexedwards]

Hi,

This looks really good, thank you. Would it be possible to add tests and a README, similar to the other store packages?

Alex

[cgossain]

Hey Alex, absolutely. I’ll take a look at that a little later.

Christian

[cgossain]

Hey @alexedwards, I added tests and a README.

All tests passed successfully on my machine. I tested using mongodb-community.

Please have a look and let me know if there are any other changes needed.

Thanks,

Christian

[cgossain]

@alexedwards Hey Alex, just a friendly reminder I've added the tests and README as requested. Let me know if there's anything else missing for the merge.

Christian

[alexedwards]

@cgossain Sorry, I hadn't forgotten, I'm just very pushed for time at the moment.

I've had a quick look and have run into the following things:

• We need go.mod and go.sum files int the mongodbstore directory. You should be able to run the following commands to add these:

$ cd mongodbstore
$ go mod init github.com/alexedwards/scs/mongodbstore
$ go mod tidy

• The import path in the README example will then need to change from "github.com/alexedwards/scs/v2/mongodbstore" to "github.com/alexedwards/scs/mongodbstore" (note no v2).

• The errors returned by mongo.Connect() should be handled in all the test functions.

• In mongodbstore.go line 143 would result in duplicate log messages being written (it duplicates line 113).

If you can send another commit addressing those things, then I'll test it out again :+1:

[cgossain]

@alexedwards great catches!

I've pushed some additional commits addressing your points above.

Thanks for reviewing.

[alexedwards]

Thanks very much! I'll try to get this merged in the next couple of days.

[alexedwards]

I've just merged this now, thanks again for your time and effort to get it completed :+1: