#!/bin/bash

# Copyright 2017 The Kubernetes Authors.
#
# 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.

source "${KUBE_ROOT}/cluster/gce/util.sh"

detect-project &> /dev/null
export PROJECT

RETRIES=3
# Runs gcloud compute command with the given parameters. Up to $RETRIES will be made
# to execute the command.
# arguments:
# $@: all stuff that goes after 'gcloud compute'
function run-gcloud-compute-with-retries {
  for attempt in $(seq 1 ${RETRIES}); do
    local -r gcloud_cmd_hash=`echo "gcloud compute $@" | md5sum | cut -f1 -d" "`
    local -r gcloud_logfile="/tmp/gcloud_${gcloud_cmd_hash}.log"
    echo "" > ${gcloud_logfile}
    if ! gcloud compute "$@" |& tee ${gcloud_logfile}; then
      if [[ $(grep -c "already exists" ${gcloud_logfile}) -gt 0 ]]; then
        if [[ "${attempt}" == 1 ]]; then
          echo -e "${color_red} Failed to $1 $2 $3 as the resource hasn't been deleted from a previous run.${color_norm}" >& 2
          exit 1
        fi
        echo -e "${color_yellow}Succeeded to $1 $2 $3 in the previous attempt, but status response wasn't received.${color_norm}"
        return 0
      fi
      echo -e "${color_yellow}Attempt $attempt failed to $1 $2 $3. Retrying.${color_norm}" >& 2
      sleep $(($attempt * 5))
    else
      echo -e "${color_green}Succeeded to gcloud compute $1 $2 $3.${color_norm}"
      return 0
    fi
  done
  echo -e "${color_red} Failed to $1 $2 $3.${color_norm}" >& 2
  exit 1
}

function create-master-instance-with-resources {
  GCLOUD_COMMON_ARGS="--project ${PROJECT} --zone ${ZONE}"

  run-gcloud-compute-with-retries disks create "${MASTER_NAME}-pd" \
    ${GCLOUD_COMMON_ARGS} \
    --type "${MASTER_DISK_TYPE}" \
    --size "${MASTER_DISK_SIZE}"
  
  if [ "${EVENT_PD:-false}" == "true" ]; then
    run-gcloud-compute-with-retries disks create "${MASTER_NAME}-event-pd" \
      ${GCLOUD_COMMON_ARGS} \
      --type "${MASTER_DISK_TYPE}" \
      --size "${MASTER_DISK_SIZE}"
  fi
  
  run-gcloud-compute-with-retries addresses create "${MASTER_NAME}-ip" \
    --project "${PROJECT}" \
    --region "${REGION}" -q
  
  MASTER_IP=$(gcloud compute addresses describe "${MASTER_NAME}-ip" \
    --project "${PROJECT}" --region "${REGION}" -q --format='value(address)')
  
  run-gcloud-compute-with-retries instances create "${MASTER_NAME}" \
    ${GCLOUD_COMMON_ARGS} \
    --address "${MASTER_IP}" \
    --machine-type "${MASTER_SIZE}" \
    --image-project="${MASTER_IMAGE_PROJECT}" \
    --image "${MASTER_IMAGE}" \
    --tags "${MASTER_TAG}" \
    --network "${NETWORK}" \
    --scopes "storage-ro,compute-rw,logging-write" \
    --boot-disk-size "${MASTER_ROOT_DISK_SIZE}" \
    --disk "name=${MASTER_NAME}-pd,device-name=master-pd,mode=rw,boot=no,auto-delete=no"
  
  if [ "${EVENT_PD:-false}" == "true" ]; then
    echo "Attaching ${MASTER_NAME}-event-pd to ${MASTER_NAME}"
    run-gcloud-compute-with-retries instances attach-disk "${MASTER_NAME}" \
    ${GCLOUD_COMMON_ARGS} \
    --disk "${MASTER_NAME}-event-pd" \
    --device-name="master-event-pd"
  fi
  
  run-gcloud-compute-with-retries firewall-rules create "${MASTER_NAME}-https" \
    --project "${PROJECT}" \
    --network "${NETWORK}" \
    --source-ranges "0.0.0.0/0" \
    --target-tags "${MASTER_TAG}" \
    --allow "tcp:443"
}

# Command to be executed is '$1'.
# No. of retries is '$2' (if provided) or 1 (default).
function execute-cmd-on-master-with-retries() {
  RETRIES="${2:-1}" run-gcloud-compute-with-retries ssh "${MASTER_NAME}" --zone="${ZONE}" --project="${PROJECT}" --command="$1"
}

function copy-files() {
	run-gcloud-compute-with-retries copy-files --zone="${ZONE}" --project="${PROJECT}" $@
}

function delete-master-instance-and-resources {
  GCLOUD_COMMON_ARGS="--project ${PROJECT} --zone ${ZONE} --quiet"

  gcloud compute instances delete "${MASTER_NAME}" \
      ${GCLOUD_COMMON_ARGS} || true
  
  gcloud compute disks delete "${MASTER_NAME}-pd" \
      ${GCLOUD_COMMON_ARGS} || true
  
  gcloud compute disks delete "${MASTER_NAME}-event-pd" \
      ${GCLOUD_COMMON_ARGS} &> /dev/null || true
  
  gcloud compute addresses delete "${MASTER_NAME}-ip" \
      --project "${PROJECT}" \
      --region "${REGION}" \
      --quiet || true
  
  gcloud compute firewall-rules delete "${MASTER_NAME}-https" \
	  --project "${PROJECT}" \
	  --quiet || true
  
  if [ "${SEPARATE_EVENT_MACHINE:-false}" == "true" ]; then
	  gcloud compute instances delete "${EVENT_STORE_NAME}" \
    	  ${GCLOUD_COMMON_ARGS} || true
  
	  gcloud compute disks delete "${EVENT_STORE_NAME}-pd" \
    	  ${GCLOUD_COMMON_ARGS} || true
  fi
}
