# Copyright © 2017 Amdocs, Bell Canada
#
# 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.

#{{ if not .Values.disableSdncSdncDbhost }}
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: sdnc-dbhost
  namespace: "{{ .Values.nsPrefix }}"
spec:
  serviceName: "dbhost"
  replicas: {{ .Values.numberOfDbReplicas }}
  selector:
    matchLabels:
      app: sdnc-dbhost
  template:
    metadata:
      labels:
        app: sdnc-dbhost
      name: sdnc-dbhost
    spec:
      initContainers:
      - name: init-mysql
        image: {{ .Values.image.mysql }}
        imagePullPolicy: {{ .Values.pullPolicy }}
        command:
        - bash
        - "-c"
        - |
          set -ex
          # Generate mysql server-id from pod ordinal index.
          [[ `hostname` =~ -([0-9]+)$ ]] || exit 1
          ordinal=${BASH_REMATCH[1]}
          echo BASH_REMATCH=${BASH_REMATCH}
          echo [mysqld] > /mnt/conf.d/server-id.cnf
          # Add an offset to avoid reserved server-id=0 value.
          echo server-id=$((100 + $ordinal)) >> /mnt/conf.d/server-id.cnf
          # Copy appropriate conf.d files from config-map to emptyDir.
          if [[ $ordinal -eq 0 ]]; then
            cp /mnt/config-map/master.cnf /mnt/conf.d/
          else
            cp /mnt/config-map/slave.cnf /mnt/conf.d/
          fi
        volumeMounts:
        - name: conf
          mountPath: /mnt/conf.d
        - name: config-map
          mountPath: /mnt/config-map
      - name: clone-mysql
        image: {{ .Values.image.xtrabackup }}
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: openECOMP1.0
        command:
        - bash
        - "-c"
        - |
          set -ex
          # Skip the clone if data already exists.
          [[ -d /var/lib/mysql/mysql ]] && exit 0
          # Skip the clone on master (ordinal index 0).
          [[ `hostname` =~ -([0-9]+)$ ]] || exit 1
          ordinal=${BASH_REMATCH[1]}
          echo ${BASH_REMATCH}
          [[ $ordinal -eq 0 ]] && exit 0
          # Clone data from previous peer.
          ncat --recv-only sdnc-dbhost-$(($ordinal-1)).dbhost.{{ .Values.nsPrefix }} 3307 | xbstream -x -C /var/lib/mysql
          # Prepare the backup.
          xtrabackup --user=root --password=$MYSQL_ROOT_PASSWORD --prepare --target-dir=/var/lib/mysql
          ls -l /var/lib/mysql
        volumeMounts:
        - name: sdnc-data
          mountPath: /var/lib/mysql
#{{ if not .Values.disableNfsProvisioner }}
          subPath: mysql
#{{ end }}
        - name: conf
          mountPath: /etc/mysql/conf.d
      containers:
      - env:
        - name: MYSQL_ROOT_PASSWORD
          value: openECOMP1.0
        - name: MYSQL_ROOT_HOST
          value: '%'
        - name: MYSQL_ALLOW_EMPTY_PASSWORD
          value: "0"
        image: {{ .Values.image.mysql }}
        imagePullPolicy: {{ .Values.pullPolicy }}
        name: sdnc-db-container
        volumeMounts:
        - mountPath: /var/lib/mysql
          name: sdnc-data
#{{ if not .Values.disableNfsProvisioner }}
          subPath: mysql
#{{ end }}
        - name: conf
          mountPath: /etc/mysql/conf.d
        ports:
        - containerPort: 3306
        resources:
          requests:
            cpu: 500m
            memory: 1Gi
        livenessProbe:
          exec:
            command: ["mysqladmin", "ping"]
          initialDelaySeconds: 30
          periodSeconds: 10
          timeoutSeconds: 5
        readinessProbe:
          tcpSocket:
            port: 3306
          initialDelaySeconds: 5
          periodSeconds: 10
      - name: xtrabackup
        image: {{ .Values.image.xtrabackup }}
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: openECOMP1.0
        ports:
        - name: xtrabackup
          containerPort: 3307
        command:
        - bash
        - "-c"
        - |
          set -ex
          cd /var/lib/mysql
          ls -l
          # Determine binlog position of cloned data, if any.
          if [[ -f xtrabackup_slave_info ]]; then
            echo "Inside xtrabackup_slave_info"
            # XtraBackup already generated a partial "CHANGE MASTER TO" query
            # because we're cloning from an existing slave.
            mv xtrabackup_slave_info change_master_to.sql.in
            # Ignore xtrabackup_binlog_info in this case (it's useless).
            rm -f xtrabackup_binlog_info
          elif [[ -f xtrabackup_binlog_info ]]; then
            echo "Inside xtrabackup_binlog_info"
            # We're cloning directly from master. Parse binlog position.
            [[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1
            rm xtrabackup_binlog_info
            echo "CHANGE MASTER TO MASTER_LOG_FILE='${BASH_REMATCH[1]}',\
                  MASTER_LOG_POS=${BASH_REMATCH[2]}" > change_master_to.sql.in
          fi

          # Check if we need to complete a clone by starting replication.
          if [[ -f change_master_to.sql.in ]]; then
            echo "Waiting for mysqld to be ready (accepting connections)"
            [[ `hostname` =~ -([0-9]+)$ ]] || exit 1
            ordinal=${BASH_REMATCH[1]}
            echo $ordinal
            until mysql --user=root --password=$MYSQL_ROOT_PASSWORD -h 127.0.0.1 -e "SELECT 1"; do sleep 1; done

            echo "Initializing replication from clone position"
            # In case of container restart, attempt this at-most-once.
            mv change_master_to.sql.in change_master_to.sql.orig
            mysql --user=root --password=$MYSQL_ROOT_PASSWORD -h 127.0.0.1 <<EOF
          $(<change_master_to.sql.orig),
            MASTER_HOST="sdnc-dbhost-0.dbhost.{{ .Values.nsPrefix }}",
            MASTER_USER="root",
            MASTER_PASSWORD="$MYSQL_ROOT_PASSWORD",
            MASTER_CONNECT_RETRY=10;
          START SLAVE;
          EOF
          fi

          # Start a server to send backups when requested by peers.
          exec ncat --listen --keep-open --send-only --max-conns=1 3307 -c \
            "xtrabackup --user=root --password=$MYSQL_ROOT_PASSWORD --backup --slave-info --stream=xbstream --host=127.0.0.1"
        volumeMounts:
        - name: sdnc-data
          mountPath: /var/lib/mysql
#{{ if not .Values.disableNfsProvisioner }}
          subPath: mysql
#{{ end }}
        - name: conf
          mountPath: /etc/mysql/conf.d
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
      volumes:
      - name: conf
        emptyDir: {}
      - name: config-map
        configMap:
          name: sdnc-mysql
      - name: localtime
        hostPath:
          path: /etc/localtime
#{{ if .Values.disableNfsProvisioner }}
      - name: sdnc-data
        hostPath:
          path: {{ .Values.dataRootDir }}/{{ .Values.nsPrefix }}/sdnc/data/mysql
#{{ else }}
  volumeClaimTemplates:
  - metadata:
      name: sdnc-data
      annotations:
        volume.beta.kubernetes.io/storage-class: "{{ .Values.nsPrefix }}-sdnc-data"
    spec:
      accessModes: ["ReadWriteMany"]
      resources:
        requests:
          storage: 1Gi
#{{ end }}
#{{ end }}