nginx.conf.ctmpl

{{ range "nginx" | ls }}
{{ .Key }} {{ .Value }};{{ end }}

events {
  {{ range "nginx/events" | ls }}
  {{ .Key }} {{ .Value }};{{ end }}
}

http {
  {{ range "nginx/http" | ls }}
  {{ .Key }} {{ .Value }};{{ end }}

  # Pre-requirements: backends must register service name and tag to Consul by specify options like `-e "SERVICE_NAME=app" -e "SERVICE_TAGS=0.0.1"` on container startup.

  # Generate backend servers with service by tag.
  # If you have a two images with tags as `0.0.1` and `0.0.2` and service name is `app` and value of consul key-value store `service/app/upstream/tag` is `0.0.1`,
  # this will generate a lines of service named `app` with tag `0.0.1` addresses and ports.
  # Options are set to `service/service_name/upstream/key` like `service/app/upstream/keepalive.
  {{ range $service := services }} {{ if ne .Name "consul" }}
  upstream {{ $service.Name }} {
      {{ range $tag, $services := service .Name | byTag }}
        {{ with $backend := printf "nginx/http/server/%s/upstream/current" $service.Name | key }}
          {{ if $backend }} {{ if eq $backend $tag }}
              {{ range $services }} server {{ .Address }}:{{ .Port }};
              {{ end }}
          {{ else }} {{ end }} {{ else }} {{ end }}
        {{ else }} server 127.0.0.1:65535; {{ end }}
      {{ end }}
    {{ range printf "nginx/http/server/%s/upstream" $service.Name | ls }}
    {{ if ne .Key "current" }}
    {{ .Key }} {{ .Value }};{{ end }}{{ end }}
  }
  {{ end }} {{ end }}

  # Generate server definitions of services.
  # You can specify listen port and server_name as `service/service_name/server/listen` and `service/service_name/server/server_name`, and also other options can set to `service/service_name/server/key` or `service/service_name/server/location/key` or `service/service_name/server/location/foo/key`.
  {{ range $service := services }} {{ if ne $service.Name "consul" }}
  server {
    {{ with $port := printf "service/%s/listen" $service.Name | key }} {{ if $port }}
    listen {{ $port }}; {{ end }} {{ else }}
    listen 80; {{ end }}

    {{ with $server_name := printf "nginx/http/server/%s/server_name" $service.Name | key }} {{ if $server_name }}
    server_name "{{ $server_name }}"; {{ end }} {{ else }}
    server_name "localhost"; {{ end }}

    root /dev/null;

    {{ range printf "nginx/http/server/%s" $service.Name | ls }} {{ if ne .Key "listen" }} {{ if ne .Key "server_name" }}
    {{ .Key }} {{ .Value }};{{ end }}{{ end }}{{ end }}

    {{ range $location, $pairs := printf "nginx/http/server/%s/location" $service.Name | tree | byKey }}
    # location {{ $location }}
    location {{ printf "nginx/http/server/%s/location/%s/expression" $service.Name $location | key }} {
      {{ range $pair := $pairs }} {{ if ne .Key "expression" }}
      {{ if or (eq .Key "proxy_set_header") (eq .Key "proxy_cache_valid") (eq .Key "proxy_cache_bypass") (eq .Key "proxy_cookie_domain") (eq .Key "proxy_cookie_path") (eq .Key "proxy_no_cache") (eq .Key "proxy_redirect") (eq .Key "fastcgi_param") (eq .Key "error_page") (eq .Key "deny") (eq .Key "rewrite") (eq .Key "if")}}
      {{ if eq $pair.Key "if" }}
      {{ range $key, $value := printf "nginx/http/server/%s/location/%s/%s" $service.Name $location $pair.Key | key | parseJSON }}
      if ({{ $key }}) {
        {{ $value }};
      }{{ end }}
      {{ else }}
      {{ range $key, $value := printf "nginx/http/server/%s/location/%s/%s" $service.Name $location $pair.Key | key | parseJSON }}
      {{ $pair.Key }} {{ $key }} {{ $value }};{{ end }}{{ end }}
      {{ else }}
      {{ .Key }} {{ .Value }};{{ end }}{{ end }}{{ end }}
    }
    {{ else }}
    # root
    location / {
      proxy_pass http://{{ $service.Name }}/;
      {{ range printf "nginx/http/server/%s/location" $service.Name | ls }}
      {{ .Key }} {{ .Value }};{{ end }}
    }
    {{ end }}

  }
  {{ end }} {{ end }}
}