{{/*
Copyright 2018 AT&T Intellectual Property.  All other rights reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/}}

{{- $envAll := . }}
---
apiVersion: v1
kind: Pod
metadata:
  name: haproxy
  namespace: {{ .Release.Namespace }}
  labels:
{{ tuple $envAll "haproxy" "server" | include "helm-toolkit.snippets.kubernetes_metadata_labels" | indent 4 }}
  annotations:
    {{ tuple $envAll | include "helm-toolkit.snippets.release_uuid" }}
spec:
  hostNetwork: true
  containers:
    - name: haproxy
      image: {{ .Values.images.tags.haproxy }}
      imagePullPolicy: {{ .Values.images.pull_policy }}
{{ tuple . .Values.pod.resources.haproxy_pod | include "helm-toolkit.snippets.kubernetes_resources" | indent 6 }}
      hostNetwork: true
      env:
        - name: HAPROXY_CONF
          value: {{ .Values.conf.haproxy.container_config_dir }}/haproxy.cfg
        - name: LIVE_HAPROXY_CONF
          value: /tmp/live_haproxy.cfg
      command:
        - /bin/sh
        - -c
        - |
            set -eux

            while [ ! -s "$HAPROXY_CONF" ]; do
                echo Waiting for "HAPROXY_CONF"
                sleep 1
            done
            echo vvv Starting with initial config vvv
            cat "$HAPROXY_CONF"
            echo
            cp "$HAPROXY_CONF" "$LIVE_HAPROXY_CONF"

            # NOTE(mark-burnett): sleep for clearer log output
            sleep 1

            haproxy -D -f "$LIVE_HAPROXY_CONF" -p /tmp/haproxy.pid

            echo HAProxy started, monitoring for config changes..

            set +x
            while true; do
                if ! cmp -s "$HAPROXY_CONF" "$LIVE_HAPROXY_CONF"; then
                    echo vvv Replacing old config vvv
                    cat "$LIVE_HAPROXY_CONF"
                    echo

                    echo vvv With new config vvv
                    cat "$HAPROXY_CONF"
                    echo

                    cat "$HAPROXY_CONF" > "$LIVE_HAPROXY_CONF"

                    # NOTE(mark-burnett): sleep for clearer log output
                    sleep 1

                    set -x
                    haproxy -D -f "$LIVE_HAPROXY_CONF" -p /tmp/haproxy.pid \
                        -x /tmp/haproxy.sock \
                        -sf $(cat /tmp/haproxy.pid)
                    set +x
                fi
                sleep {{ .Values.conf.haproxy.period }}
            done

      volumeMounts:
        - name: etc
          mountPath: {{ .Values.conf.haproxy.container_config_dir }}
          readOnly: True
  volumes:
    - name: etc
      hostPath:
        path: {{ .Values.conf.haproxy.host_config_dir }}
  securityContext:
    readOnlyRootFilesystem: true