Support for Registrator's service attributes

[denzuko]

As a user I would like to define two backends on deployment
So that I can route dynamically with acls in haproxy

Scenario:

Given I have the following template:

frontend www
    bind *:80
    reqadd x-forwarded-proto:\ http
    default_backend consul
{{ range services }}
  {{ if .Tags.Contains "http" }}
    acl host_{{ .Name }} hdr(host) -i {{ .Name }}.{{ or (env "HAPROXY_DOMAIN") "fmr.com" }}
    acl host_{{ .Name }}_uri path_beg -i /{{ .Name }}
    use_backend {{ .Name }}_backend if host_{{ .Name }}
    use_backend {{ .Name }}_backend if host_{{ .Name }}_uri
  {{ else if and (.Tags.Contains "http") (.Tags.Contains "deploy") }}
    acl host_{{ .service.Attrs.DirectName }} hdr(host) -i {{ .service.Attrs.DirectName }}.{{ or (env "HAPROXY_DOMAIN") "fmr.com" }}
    acl host_{{ .service.Attrs.DirectName }}_uri path_beg -i /{{ .service.Attrs.DirectName }}
    use_backend {{ .service.Attrs.DirectName }}_backend if host_{{ .Name }}
    use_backend {{ .service.Attrs.DirectName }}_backend if host_{{ .Name }}_uri
  {{ end }}
{{ end }}

{{ range services }}
  {{ if (.Tags.Contains "http") }}
backend {{ .Name }}_backend
    reqirep ^([^\ :]*\ /){{.Name}}[/]?(.*) \1\2
    {{ range service .Name}}
    server {{ .Node }} {{ .Address }}:{{ .Port }}
    {{ end }}

backend {{ .node.attrs.directname }}_backend
    reqirep ^([^\ :]*\ /){{.service.Attrs.DirectName}}[/]?(.*) \1\2
    {{ range service .Name}}
    server {{ .Node }} {{ .Address }}:{{ .Port }}
    {{ end }}
  {{ end }}
{{ end }}

And provide the environment variable SERVICE_DIRECTNAME
Then consul-template should expand the values from SERVICE_DIRECTNAME into service.Attrs.DirectName on template generation

[samber]

FYI, Consul still doesn't support attributes as noticed by Registrator doc: http://gliderlabs.com/registrator/latest/user/services/#tags-and-attributes

An issue is pending about adding this feature: hashicorp/consul/issues/1107

On the Registrator side, a PR is also pending, adding use of Consul KV as attribute storage: gliderlabs/registrator/pull/242

[sethvargo]

Hi @denzuko

I'm not familiar with registrator, and Consul Template is designed to integrate with Consul and Vault. I don't think this is something we plan to implement ourselves, but we would gladly review a pull request to implement this functionality. Thanks! 😄