I'm not sure what you mean when you state that Foxx servcies "cannot be 
segregated from the database file."  Foxx services are very-much 
database-specific, so are you saying that you use Node because you can't 
create a Foxx service that has access to a different database from which it 
is installed? 

I also use Node/Express as middleware, partly so I don't expose the 
database directly, but also as an extra "sanitation" and queuing layer for 
the outside world.  My application clearly defines roles between Node and 
Foxx, and although I found the two layers daunting at first, I find Foxx 
services to be extremely helpful, invaluable even.

>From what I understand, JWT methods for session management 
<https://www.arangodb.com/docs/3.6/foxx-reference-sessions-storages-jwt.html> 
are tied to a database, specifically to a "sessions" collection within a 
database.  According to the docs 
<https://www.arangodb.com/docs/3.6/programs-starter-security.html#creating-authentication-tokens>,
 
JWT can also be used for intra-server communication within a cluster, but I 
would not use this for client or middle-ware authentication (though maybe 
someone at ArangoDB wants to prove me wrong?).  My guess is that you're 
using this cluster-oriented JWT mechanism, and the random nature of your 
JWT failures is due to the server engine(s) rolling the key without Node 
being part of the conversation (just a theory, though).

I would recommend the design pattern that works for me:  deploy the same 
Foxx services in each database (same code/ZIP package) but call each 
service via it's unique path (database name).  Since Foxx cannot access 
data/memory across databases, so this might be a good way to secure client 
data.  You will have to implement a "sessions" or middleware that manages 
client authentication via Node - this could be done with a dedicated 
"sessions" database in ArangoDB, or you could build it on another server 
altogether (Redis, maybe?).

-- Kerry 

On Monday, August 24, 2020 at 8:10:16 AM UTC-7 [email protected] wrote:

> I would like to use a separate database file per client for an SaaS. I am 
> using node-express as middleware. I am not using Foxx as Foxx cannot be 
> segregated from the database file itself.
>
> Currently I am changing the database to use based on the user JWT token 
> via a middleware function and the Javascript driver function 'useDatabase'. 
> So multiple users share the same middleware and are routed to their 
> respective database files. 
>
> This seems to work at first but fails seemingly randomly. I instead would 
> prefer to pass the actual db name with each and every Http call, but naming 
> the db in the Javascript driver doesn't seem to be supported/recommended.
>
> What are my (other) options? I would prefer not to have a multi tenant 
> database for security and administration reasons. 
>
> Thank you. 
>

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