Re: State of FMN (FedMSG Notifications) and Replacement

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On Wed, 2020-02-26 at 13:04 -0500, Robbie Harwood wrote:
> 
> Would be nice if there were an API that would let us listen to it
> without needing to write an IRC bot or loop polling an HTTP endpoint.
> It sounds like this is similar to what Jeremy was proposing, but I'm not
> sufficiently versed in Messaging language to know.

Maybe I'm missing something, but if you want to do that, I would think
you would want to use the *messaging system itself*, not a notification
system built on top of the messaging system which is intended
specifically for producing notifications for *humans*?

You can already work with fedora-messaging fine in production, there
are docs and examples to follow:

https://fedora-messaging.readthedocs.io/en/latest/index.html

both openqa and bodhi deploy fedora-messaging consumer and publishers
in infra; you can look at their infra roles and git repos to get a
handle on how that works. e.g. the templates for the openQA consumers
are at
https://infrastructure.fedoraproject.org/cgit/ansible.git/tree/roles/openqa/dispatcher/templates ,
other relevant bits in
https://infrastructure.fedoraproject.org/cgit/ansible.git/tree/roles/openqa/dispatcher/tasks/main.yml
,
https://infrastructure.fedoraproject.org/cgit/ansible.git/tree/inventory/group_vars/openqa_common and
https://infrastructure.fedoraproject.org/cgit/ansible.git/tree/playbooks/groups/openqa.yml .
For an example of the actual consumer code, see
https://pagure.io/fedora-qa/fedora_openqa/blob/master/f/fedora_openqa/consumer.py .
Deploying a consumer outside of infra mainly just involves writing
the consumer code, writing a config file like the ones in
https://infrastructure.fedoraproject.org/cgit/ansible.git/tree/roles/openqa/dispatcher/templates
or the documentation or the sample at
https://github.com/fedora-infra/fedora-messaging/blob/master/configs/fedora.toml 
and placing it in /etc/fedora-messaging , then enabling and starting
the `fm-consumer@(whatever).service` service.

At present, there is two-way bridging between fedmsg and fedora-
messaging: messages published natively as fedmsgs are republished as
fedora-messaging messages, and vice versa. So you can write a fedora-
messaging-native consumer and still consume messages that are natively
published as fedmsgs (or vice versa, but don't do that, we're trying to
get people onto fedora-messaging :>)
-- 
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net
http://www.happyassassin.net
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