Subscriptions

[Daniel Nauck]

Hello,

on application startup i'm subscribing with the C# client to all events i'm interested in with $et-<EventName> using SubscribeToStreamFrom(...).

But in the early stage of the application lifetime not all events are in the event store (like e.g. CustomerDisabled). And i get a CatchUpError with an access denied exception. Not very helpful because i want to subscribe and handle them as soon as such an event is fired.

How can i subscribe to such events?

[Greg Young]

A catch up subscription will deliver them as they happen perhaps you can share your code? What user is the subscription being connected as?

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Le doute n'est pas une condition agréable, mais la certitude est absurde.

[James Nugent]

If it's subscribing to $et-whatever you will need to authenticate as ACL for system streams is admin only by default iirc. admin/changeit are the defaults.

However it seems you're likely on a wrong course with subscribing like that, if you can share your code we can probably help.

James

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[Daniel Nauck]

Hello,

the EventStore is just running local and used without credentials for now.

The sample code for the dispatcher is available here: https://gist.github.com/dnauck/7231622

Each event handler (read model projections, etc) registers all events that it is handling in the dispatcher and then it add a subscription to $et-<NameOfEvent>.

The SubscribeToAllFrom(..) was not working, as it also required admin permissions. And i don’t want to subscribe to all events, just the ones i need.

Thanks for your help.

Daniel

[Greg Young]

You are passing in the connection to this code. If I understand you properly you are not setting credentials on it. To read system streams such as $et or $all you need to have admin privs (or change the default acls to allow it). Try setting user credentials of user:changeit on your connection and things should work. Alternatively instead of using $et streams you could write your own projection that writes to user space streams and set privs on them how you see fit via stream metadata

https://github.com/eventstore/eventstore/wiki/Stream-Metadata-Parameters

https://github.com/eventstore/eventstore/wiki/Access-Control-Lists

Should be useful.

Cheers,

Greg

[Daniel Nauck]

Hi Greg,

thank you. It works now.

I'm using the sample projection from your blog:

fromAll().

    when({

        $any : function(s,e) { linkTo("EventType-" + e.type, e); }

    });

But is this the way to go in general or do you suggest any other way to go when subscribing to events?

Thanks.

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[Greg Young]

If you want it in user space that's correct. If you are running the $et system projection though you probably prefer to just use it's streams as otherwise you do all the same work twice :) just adding the credentials (or creating a different user and giving them admin rights) will allow you to subscribe to the system streams.

Cheers.

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