This commit also includes a policy helper
`policy_extras.listener_domains` to make it convenient to define
listener domains in toml and/or json files.
To facilitate this, the DomainMap rust structure has been exposed
to lua code via the new `kumo.domain_map.new` function.
Switch the configuration plumbing for pools and sources to be pull-based
rather than push based.
In other words, rather than defining them in the `init` event,
you now need to supply them to the new `get_egress_pool` and
`get_egress_source` events.
Data is cached by default for 1 minute. This allows for new sources
to come into being on-demand, and for data to age out and change
over time, without requiring that the server be restarted.
This commit updates the reference section, but there is some content
in the user guide that refers to the old style of configuration that
will need to be updated.
refs: https://github.com/KumoCorp/kumomta/issues/13
I used a config like this for testing:
```
global
log stdout format raw local0 debug
defaults
timeout connect 10s
timeout client 30s
timeout server 30s
log global
listen outboundsmtp
log global
bind 0:2526 accept-proxy
mode tcp
use-server v4 if { src 0.0.0.0/0 }
use-server v6 if { src ::/0 }
server v4 0.0.0.0 source 0.0.0.0 usesrc clientip
server v6 ::: source ::: usesrc clientip
```
Launched via:
```console
$ sudo haproxy -f assets/haproxy.conf -V
```
with the source:
```lua
kumo.define_egress_source {
name = 'w00t',
ha_proxy_server = '127.0.0.1:2526',
ha_proxy_source_address = '192.168.1.92',
}
```
refs: #19
This makes it easier to compose secret management with a variety
of lua functions without having to build that directly into each
of them.
In particular: one can now use vaults or other secret stores that
we add in the future to manage credentials for HTTP clients.
Tom Mairs
Wez Furlong
Mike Hillyer