#!/bin/bash

# Copyright 2014 Google Inc. All 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.

# Bring up a Kubernetes cluster.
#
# If the full release name (gs://<bucket>/<release>) is passed in then we take
# that directly.  If not then we assume we are doing development stuff and take
# the defaults in the release config.

set -o errexit
set -o nounset
set -o pipefail

KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
source "${KUBE_ROOT}/cluster/kube-env.sh"
source "${KUBE_ROOT}/cluster/${KUBERNETES_PROVIDER}/util.sh"

get-password
detect-master > /dev/null
detect-minions > /dev/null

MINIONS_FILE=/tmp/minions
attempt=0
while true; do
  "${KUBE_ROOT}/cluster/kubectl.sh" get minions -o template -t $'{{range.items}}{{.id}}\n{{end}}' > "${MINIONS_FILE}"
  found=$(grep -c . "${MINIONS_FILE}")
  if [[ ${found} == "${NUM_MINIONS}" ]]; then
    break
  else
    if (( attempt > 5 )); then
      echo -e "${color_red}Detected ${found} nodes out of ${NUM_MINIONS}. Your cluster may not be working. ${color_norm}"
      exit 2
    fi
    attempt=$((attempt+1))
    sleep 30
  fi
done
echo "Found ${found} nodes."

# On vSphere, use minion IPs as their names
if [[ "${KUBERNETES_PROVIDER}" == "vsphere" ]] || [[ "${KUBERNETES_PROVIDER}" == "vagrant" ]]; then
  MINION_NAMES=("${KUBE_MINION_IP_ADDRESSES[@]}")
fi

for (( i=0; i<${#MINION_NAMES[@]}; i++)); do
    # Grep returns an exit status of 1 when line is not found, so we need the : to always return a 0 exit status
    # Make several attempts to deal with slow cluster birth.
    attempt=0
    while true; do
      echo -n "Attempt $((attempt+1)) to find ${MINION_NAMES[$i]} ..."
      count=$(grep -c "${MINION_NAMES[$i]}" "${MINIONS_FILE}") || :
      if [[ "${count}" == "0" ]]; then
          if (( attempt > 5 )); then
            echo -e "${color_red}Failed to find ${MINION_NAMES[$i]}, cluster is probably broken.${color_norm}"
            exit 1
          fi
      else
        echo -e " ${color_green}[working]${color_norm}"
        break
      fi
      echo -e " ${color_yellow}[not working yet]${color_norm}"
      attempt=$((attempt+1))
      sleep 20
    done

    name="${MINION_NAMES[$i]}"
    if [ "$KUBERNETES_PROVIDER" != "vsphere" ] && [ "$KUBERNETES_PROVIDER" != "vagrant" ]; then
      # Grab fully qualified name
      name=$(grep "${MINION_NAMES[$i]}\." "${MINIONS_FILE}")
    fi

    # Make sure the kubelet is healthy.
    # Make several attempts to deal with slow cluster birth.
    attempt=0
    while true; do
      echo -n "Attempt $((attempt+1)) at checking Kubelet installation on node ${MINION_NAMES[$i]} ..."
      curl_output=$(curl -s --insecure --user "${KUBE_USER}:${KUBE_PASSWORD}" \
          "https://${KUBE_MASTER_IP}/api/v1beta1/proxy/minions/${name}/healthz")
      if [[ "${curl_output}" != "ok" ]]; then
          if (( attempt > 5 )); then
            echo
            echo -e "${color_red}Kubelet failed to install on node ${MINION_NAMES[$i]}. Your cluster is unlikely to work correctly."
            echo -e "Please run ./cluster/kube-down.sh and re-create the cluster. (sorry!)${color_norm}"
            exit 1
          fi
      else
          echo -e " ${color_green}[working]${color_norm}"
          break
      fi
      echo -e " ${color_yellow}[not working yet]${color_norm}"
      attempt=$((attempt+1))
      sleep 30
    done
done
echo -e "${color_green}Cluster validation succeeded${color_norm}"