variable "base_hostname" {
  type = string
  description = "Base hostname to serve content from"
  default = "dev.homelab"
}

job "traefik" {
  datacenters = ["dc1"]
  type = "service"
  priority = 100

  constraint {
    attribute = "${node.class}"
    value = "ingress"
  }

  constraint {
    distinct_hosts = true
  }

  update {
    max_parallel = 1
    # canary = 1
    # auto_promote = true
    auto_revert = true
  }

  group "traefik" {
    count = 1

    network  {
      port "web" {
        static = 80
      }
      port "websecure" {
        static = 443
      }
    }

    ephemeral_disk {
      migrate = true
      sticky = true
    }

    service {
      name = "traefik"
      port = "web"

      check {
        type = "http"
        path = "/ping"
        port = "web"
        interval = "10s"
        timeout = "2s"
      }

      connect {
        native = true
      }

      tags = [
        "traefik.enable=true",
        "traefik.http.routers.traefik.entryPoints=websecure",
        "traefik.http.routers.traefik.service=api@internal",
      ]
    }

    task "traefik" {
      driver = "docker"

      config {
        image = "traefik:2.6"

        ports = ["web", "websecure"]
        network_mode = "host"

        mount {
          type = "bind"
          target = "/etc/traefik"
          source = "local/config"
        }

        mount {
          type = "bind"
          target = "/etc/traefik/usersfile"
          source = "secrets/usersfile"
        }
      }

      vault {
        policies = ["access-tables", "nomad-task"]
      }

      template {
        # Avoid conflict with TOML lists [[ ]] and Go templates {{ }}
        left_delimiter = "<<"
        right_delimiter = ">>"
        data = <<EOH
[log]
  level = "DEBUG"

[entryPoints]
  [entryPoints.web]
    address = ":80"
    [entryPoints.web.http]
      [entryPoints.web.http.redirections]
        [entryPoints.web.http.redirections.entrypoint]
          to = "websecure"
          scheme = "https"

  [entryPoints.websecure]
    address = ":443"
    [entryPoints.websecure.http.tls]
    << if keyExists "traefik/acme/email" ->>
      certResolver = "letsEncrypt"
      [[entryPoints.websecure.http.tls.domains]]
        main = "*.<< keyOrDefault "global/base_hostname" "${var.base_hostname}" >>"
    << end ->>

  [entryPoints.metrics]
    address = ":8989"

[api]
  dashboard = true

[ping]
  entrypoint = "web"

[metrics]
  [metrics.prometheus]
    entrypoint = "metrics"
    # manualRouting = true

[providers.file]
  directory = "/etc/traefik/conf"
  watch = true

[providers.consulCatalog]
  connectAware = true
  connectByDefault = true
  exposedByDefault = false
  defaultRule = "Host(`{{normalize .Name}}.<< keyOrDefault "global/base_hostname" "${var.base_hostname}" >>`)"
  [providers.consulCatalog.endpoint]
    address = "http://<< env "CONSUL_HTTP_ADDR" >>"

<< if keyExists "traefik/acme/email" ->>
[certificatesResolvers.letsEncrypt.acme]
  email = "<< key "traefik/acme/email" >>"
  storage = "/secrets/acme.json"
  [certificatesResolvers.letsEncrypt.acme.dnsChallenge]
    provider = "cloudflare"
    resolvers = ["1.1.1.1:53", "8.8.8.8:53"]
    delayBeforeCheck = 0
<< end ->>
        EOH
        destination = "local/config/traefik.toml"
      }

      template {
        data = <<EOH
{{ with secret "kv/data/cloudflare" }}
CF_DNS_API_TOKEN={{ .Data.data.api_token_dns_edit }}
CF_ZONE_API_TOKEN={{ .Data.data.api_token_zone_read }}
{{ end }}
        EOH
        destination = "secrets/cloudflare.env"
        env = true
      }

      template {
        data = <<EOH
[http]
  [http.routers]
    [http.routers.nomad]
      entryPoints = ["websecure"]
      # middlewares = []
      service = "nomad"
      rule = "Host(`nomad.{{ keyOrDefault "global/base_hostname" "${var.base_hostname}" }}`)"
    [http.routers.consul]
      entryPoints = ["websecure"]
      # middlewares = []
      service = "consul"
      rule = "Host(`consul.{{ keyOrDefault "global/base_hostname" "${var.base_hostname}" }}`)"
    [http.routers.vault]
      entryPoints = ["websecure"]
      # middlewares = []
      service = "vault"
      rule = "Host(`vault.{{ keyOrDefault "global/base_hostname" "${var.base_hostname}" }}`)"

  [http.services]
    {{ with service "nomad-client" -}}
    [http.services.nomad]
      [http.services.nomad.loadBalancer]
        {{ range . -}}
        [[http.services.nomad.loadBalancer.servers]]
          url = "http://{{ .Address }}:{{ .Port }}"
        {{ end }}
    {{- end }}
    {{ with service "consul" -}}
    [http.services.consul]
      [http.services.consul.loadBalancer]
        {{ range . -}}
        [[http.services.consul.loadBalancer.servers]]
          # Not using .Port because that's an RPC port
          url = "http://{{ .Address }}:8500"
        {{ end }}
    {{- end }}
    {{ with service "vault" -}}
    [http.services.vault]
      [http.services.vault.loadBalancer]
        {{ range . -}}
        [[http.services.vault.loadBalancer.servers]]
          url = "http://{{ .Address }}:{{ .Port }}"
        {{ end }}
    {{- end }}
        EOH
        destination = "local/config/conf/route-hashi.toml"
        change_mode = "noop"
      }

      template {
        data = <<EOH
[http.middlewares]
{{ with secret "kv/data/traefik" }}
{{ if .Data.data.usersfile }}
  [http.middlewares.basic-auth.basicAuth]
    usersFile = "/etc/traefik/usersfile"
{{ end }}
{{ end }}
        EOH
        destination = "local/config/conf/middlewares.toml"
        change_mode = "noop"
      }

      template {
        data = <<EOH
{{ with secret "kv/data/traefik" }}
{{ .Data.data.usersfile }}
{{ end }}
        EOH
        destination = "secrets/usersfile"
        change_mode = "noop"
      }

      resources {
        cpu = 100
        memory = 100
        memory_max = 500
      }
    }
  }
}