{{- $name := .Values.fullnameOverride | default "redis" -}}
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: {{ $name }}
  namespace: {{ .Release.Namespace }}
  labels:
    app: {{ $name }}
spec:
  serviceName: {{ $name }}
  replicas: 1
  selector:
    matchLabels:
      app: {{ $name }}
  template:
    metadata:
      labels:
        app: {{ $name }}
    spec:
      securityContext:
        # The official image runs as the redis user (uid 999 on the Alpine
        # variant). fsGroup makes the provisioned volume group-writable so
        # Redis can write the ACL file it is given — without it ACL SAVE
        # fails at provisioning time with a permission error.
        fsGroup: 999
      terminationGracePeriodSeconds: 30
      initContainers:
        # Seeds the ACL file with the default (admin) user on first boot
        # only. Redis will not start with an --aclfile that does not exist,
        # and the default user has to be defined there rather than by
        # requirepass — see the long note in values.yaml for why that
        # distinction is a security property and not a preference.
        #
        # Never overwrites an existing file. That file is rewritten by ACL
        # SAVE every time toolshed provisions an app user, so recreating it
        # on every pod start would silently delete every provisioned user
        # and lock those apps out — the exact failure this whole design
        # exists to prevent, reintroduced from the other end.
        #
        # Consequence worth knowing: rotating the admin password in Vault
        # does NOT propagate here, because this only ever runs against a
        # missing file. Rotating means `ACL SETUSER default >newpassword`
        # followed by `ACL SAVE` against the running server.
        - name: seed-acl
          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
          imagePullPolicy: {{ .Values.image.pullPolicy }}
          env:
            - name: REDIS_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: {{ .Values.existingSecret }}
                  key: {{ .Values.secretKeys.password }}
          command:
            - sh
            - -c
            - |
              set -e
              if [ -f /data/users.acl ]; then
                echo "ACL file already present; leaving it alone."
                exit 0
              fi
              echo "user default on >$REDIS_PASSWORD ~* &* +@all" > /data/users.acl
              chmod 600 /data/users.acl
              echo "Seeded ACL file with the default user."
          volumeMounts:
            - name: data
              mountPath: /data
      containers:
        - name: redis
          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
          imagePullPolicy: {{ .Values.image.pullPolicy }}
          args:
            - redis-server
            - --aclfile
            - /data/users.acl
            - --maxmemory
            - {{ .Values.config.maxmemory | quote }}
            - --maxmemory-policy
            - {{ .Values.config.maxmemoryPolicy | quote }}
            - --save
            - {{ .Values.config.save | quote }}
          ports:
            - name: redis
              containerPort: 6379
              protocol: TCP
          # Authenticated probes: with the ACL file in place an
          # unauthenticated PING is correctly refused with NOAUTH, so a
          # bare `redis-cli ping` would mark a perfectly healthy server as
          # failing. Run through a shell so the environment expands —
          # Kubernetes does not substitute $(VAR) inside exec probe
          # commands.
          env:
            - name: REDIS_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: {{ .Values.existingSecret }}
                  key: {{ .Values.secretKeys.password }}
          readinessProbe:
            exec:
              command: ["sh", "-c", 'redis-cli --no-auth-warning -a "$REDIS_PASSWORD" ping | grep -q PONG']
            initialDelaySeconds: 5
            periodSeconds: 10
            timeoutSeconds: 5
            failureThreshold: 6
          livenessProbe:
            exec:
              command: ["sh", "-c", 'redis-cli --no-auth-warning -a "$REDIS_PASSWORD" ping | grep -q PONG']
            initialDelaySeconds: 20
            periodSeconds: 20
            timeoutSeconds: 5
            failureThreshold: 6
          resources:
            {{- toYaml .Values.resources | nindent 12 }}
          volumeMounts:
            - name: data
              mountPath: /data
{{- if .Values.persistence.enabled }}
  volumeClaimTemplates:
    - metadata:
        name: data
      spec:
        accessModes: ["ReadWriteOnce"]
        storageClassName: {{ .Values.persistence.storageClass | quote }}
        resources:
          requests:
            storage: {{ .Values.persistence.size | quote }}
{{- end }}