Check if CouchDB is connected about superlogin

[quanglam2807]

Finally, I make it work!

host: "cloudant_account.cloudant.com/_all_dbs",

to

host: "cloudant_account.cloudant.com",

Still, I think we need to add log for this.

[colinskow]

Yes, host must be set to the root of your CouchDB or Cloudant server, not /_all_dbs. SuperLogin won't actually try to connect to the DB until you attempt to perform an actions such as login or registration. If it cannot connect, it should throw an error the first action you try to perform.

Any errors thrown will go to console.error so you should be able to use a logger like morgan to capture these.

If you have any specific suggestions for how to improve this, let me know.

[colinskow]

OK, I did confirm that when the DB connection fails, the API seems to wait forever and gives no error. This is because there is no timeout set on PouchDB. I'll add a feature in the next release so you can set your own personal timeout, and you should get a correct error after that.

[colinskow]

Apparently, if a Node.js request is unable to connect to the server, then the timeout is set by your operating system (generally between 20 and 120 seconds) and there is no easy way to override it. So unfortunately if your DB is configured wrong or isn't responding, then the SuperLogin API is going to hang for a while. I don't think there's much we can do about it.

[colinskow]

OK, I fixed a bug in the /login code, which was preventing the promise from correctly rejecting. It will now display the error: Error: connect ECONNREFUSED 127.0.0.1:5984 if unable to connect. I will upload this fix with the next release shortly.