Dash as first character in topic

[rogerjaffe]

Dash as first character in topic

[ifandelse]

Hi @rogerjaffe - I've been trying as much as I can to have postal's default bindings resolver to match the semantics in the AMQP spec (not because of any interoperability, but because I love the spec). The AMQP spec notes the following:

The routing key used for a topic exchange MUST consist of zero or more words delimited by dots. Each word may contain the letters A-Z and a-z and digits 0-9.

It is possible to customize the bindingsResolver by assigning your own:

    postal.configuration.resolver = customResolver;

The resolve needs to implement a compare( binding, topic ) (that returns true if there's a match, false if not) and reset method (reset is optional, IIRC).

The regex being built in the default resolver isn't currently set up to handle leading dashes - just curious, any particular constraint get thrown at you requiring a leading dash?

In the meantime, I'll try to evaluate if I want to munge that regex any. Curious if @dcneiner or @arobson have opinions here as well...

[rogerjaffe]

I have been using Firebase as the DB backend and I was using the FB-generated key when adding new records as part of the message to let my app's view models know about the change in data. Those keys all start with a dash -- so a sample message would be something like 'data.students.-JBNFkdglaE9hS3Yn6Tt' and that's what was generating the problem. Thanks for letting me know how to customize it!

[ifandelse]

@rogerjaffe Hopefully you've had some luck overriding the bindings resolver - if you need any help, let me know. Ideally, I'd like to keep the postal "core/default" resolver as-is, since the option to override with custom topic matching is available. Closing this issue for now - but if you need anything, don't hesitate to open a new one!

[rogerjaffe]

No problem -- Thanks for the help!
RJ

On Fri, Jan 17, 2014 at 7:25 AM, Jim Cowart [email protected]:

@rogerjaffe https://github.com/rogerjaffe Hopefully you've had some
luck overriding the bindings resolver - if you need any help, let me know.
Ideally, I'd like to keep the postal "core/default" resolver as-is, since
the option to override with custom topic matching is available. Closing
this issue for now - but if you need anything, don't hesitate to open a new
one!

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/57#issuecomment-32614644
.

Roger Jaffe
Patrick Henry High School
[email protected]
858-876-4375