Hi all,
I'm working on a website that does all the basic stuff: permissions,
authentication, CRUD on objects, etc. One thing that has been a bit hard is
passing around the context of a request - the session information, who the
user is, etc.
In everyone's favorite language (Java, obviously) you can write code like:
impersonationService.doWithPermission(Permission.DELETE_ALL_THE_THINGS,
new Callable() {
public void call() {
rmService.rmRf('/'); // does a permissions check against a
ThreadLocal context. That context is passed to any new threads started by
this one.
}
});
In NodeJS, we don't have as much control over the thread context afaik.
I've been manually passing the context information around:
rmService.rmRf(requestContext.withPermission(Permission.DELETE_ALL_THE_THINGS),
'/');
This is ok, but can get unwieldy when the call to rmService is multiple
levels deep in the call stack. It seems tedious to always be passing this
requestContext around manually.
I was wondering if anyone had a good solution to this, or if my best bet is
to continue manually passing that info around.
Alternatively, I was wondering if this idea had been brought up before.
We'd create a concept very much like domains, but for passing contexts.
Something like:
Domain.prototype.run = function(fn) {
var oldDomain = Domain.current;
Domain.current = this; // would need to happen on every turn of the
event loop, similar to domains
fn();
Domain.current = oldDomain;
};
app.delete('/', function(req, res, next) {
var d = Domain.create();
d.context =
requestContext.withPermission(Permission.DELETE_ALL_THE_THINGS);
d.run(function() {
rmService.rmRf('/'); // can access the request context through
Domain.current.context
});
});
Thoughts?
Adam
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