route

- uri: template://default-provisioners/route
  type: route
  description: Provisions a ingress route on a shared Nginx instance.
  init: |
    randomServiceName: routing-{{ randAlphaNum 6 }}
    sk: default-provisioners-routing-instance
    {{ if not (regexMatch "^/|(/([^/]+))+$" .Params.path) }}{{ fail "params.path start with a / but cannot end with /" }}{{ end }}
    {{ if not (regexMatch "^[a-z0-9_.-]{1,253}$" .Params.host) }}{{ fail (cat "params.host must be a valid hostname but was" .Params.host) }}{{ end }}
    {{ $ports := (index .WorkloadServices .SourceWorkload).Ports }}
    {{ if not $ports }}{{ fail "no service ports exist" }}{{ end }}
    {{ $port := index $ports (print .Params.port) }}
    {{ if not $port.TargetPort }}{{ fail "params.port is not a named service port" }}{{ end }}    

  shared: |
    {{ .Init.sk }}:
      instancePort: {{ dig .Init.sk "instancePort" 8080 .Shared }}
      instanceServiceName: {{ dig .Init.sk "instanceServiceName" .Init.randomServiceName .Shared | quote }}
      {{ $targetHost := (index .WorkloadServices .SourceWorkload).ServiceName }}
      {{ $ports := (index .WorkloadServices .SourceWorkload).Ports }}
      {{ $port := index $ports (print .Params.port) }}
      {{ $targetPort := $port.TargetPort }}
      {{ $target := (printf "%s:%d" $targetHost $targetPort) }}
      {{ $hBefore := dig .Init.sk "hosts" (dict) .Shared }}
      {{ $rBefore := dig .Params.host (dict) $hBefore }}
      {{ $pathType := dig "compose.score.dev/route-provisioner-path-type" "Prefix" (dig "annotations" (dict) (.Metadata | default (dict))) }}
      {{ $inner := dict "path" .Params.path "target" $target "port" $targetPort "path_type" $pathType }}
      {{ $rAfter := (merge $rBefore (dict .Uid $inner)) }}
      {{ $hAfter := (merge $hBefore (dict .Params.host $rAfter)) }}
      hosts: {{ $hAfter | toRawJson }}    
  files: |
    {{ dig .Init.sk "instanceServiceName" "" .Shared }}/nginx.conf: |
      worker_processes 1;
      worker_rlimit_nofile 8192;
      events {
        worker_connections 4096;
      }
      http {
        resolver 127.0.0.11;

        {{ range $h, $r := (dig .Init.sk "hosts" "" .Shared) }}
        server {
          listen 80;
          listen [::]:80;
          server_name {{ $h }};

          proxy_set_header X-Real-IP              $remote_addr;
          proxy_set_header X-Forwarded-For        $remote_addr;
          proxy_set_header X-Original-Forwarded-For $http_x_forwarded_for;
          proxy_set_header Proxy                  "";
          proxy_connect_timeout                   5s;
          proxy_send_timeout                      60s;
          proxy_read_timeout                      60s;
          proxy_buffers                           16 4k;
          proxy_buffer_size                       2k;
          client_max_body_size                    10m;
      {{ dig "compose.score.dev/route-provisioner-server-snippet" "" (dig "annotations" (dict) ($.Metadata | default (dict))) | indent 4 }}

          location = /favicon.ico {
            return 204;
            access_log     off;
            log_not_found  off;
          }

          {{ range $k, $v := $r }}
          # the basic path variant, "/" or "/one/two"
          location ~ ^{{ index $v "path" }}$ {
            set $backend {{ index $v "target" }};
            proxy_pass http://$backend;
      {{ dig "compose.score.dev/route-provisioner-location-snippet" "" (dig "annotations" (dict) ($.Metadata | default (dict))) | indent 6 }}
          }

          # The prefix match variants are included by default but can be excluded via 'compose.score.dev/route-provisioner-path-type' annotation
          {{ if eq (index $v "path_type") "Prefix" }}
          location ~ ^{{ index $v "path" | trimSuffix "/" }}/.* {
            set $backend {{ index $v "target" }};
            proxy_pass http://$backend;
      {{ dig "compose.score.dev/route-provisioner-location-snippet" "" (dig "annotations" (dict) ($.Metadata | default (dict))) | indent 6 }}
          }
          {{ end }}
          {{ end }}
        }
        {{ end }}
      }    

  services: |
    {{ $p := (dig .Init.sk "instancePort" 0 .Shared) }}
    {{ dig .Init.sk "instanceServiceName" "" .Shared }}:
      image: mirror.gcr.io/nginx:1-alpine
      restart: always
      ports:
        - published: {{ $p }}
          target: 80
      volumes:
        - type: bind
          source: {{ .MountsDirectory }}/{{ dig .Init.sk "instanceServiceName" "" .Shared }}/nginx.conf
          target: /etc/nginx/nginx.conf
          readOnly: true    
  info_logs: |
    {{ $p := (dig .Init.sk "instancePort" 0 .Shared) }}
    - "{{.Uid}}: To connect to this route, http://{{ .Params.host }}:{{ $p }}{{ .Params.path }} (make sure {{ .Params.host }} resolves to localhost)"    
  supported_params:
    - host
    - port
    - path