#!/usr/bin/env bash

# Copyright 2015 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.

readonly root=$(dirname "${BASH_SOURCE}")

## Contains configuration values for the CentOS cluster
# The user should have sudo privilege
export MASTER=${MASTER:-"centos@172.10.0.11"}
export MASTER_IP=${MASTER#*@}

# Define all your master nodes,
# And separated with blank space like <user_1@ip_1> <user_2@ip_2> <user_3@ip_3>.
# The user should have sudo privilege
export MASTERS="${MASTERS:-$MASTER}"

# length-of <arg0>
# Get the length of specific arg0, could be a space-separate string or array.
function length-of() {
  local len=0
  for part in $1; do
    let ++len
  done
  echo $len
}
# Number of nodes in your cluster.
export NUM_MASTERS="${NUM_MASTERS:-$(length-of "$MASTERS")}"

# Get default master advertise address: first master node.
function default-advertise-address() {
  # get the first master node
  local masters_array=(${MASTERS})
  local master=${masters_array[0]}
  echo ${master#*@}
}

# Define advertise address of masters, could be a load balancer address.
# If not provided, the default is ip of first master node.
export MASTER_ADVERTISE_ADDRESS="${MASTER_ADVERTISE_ADDRESS:-$(default-advertise-address)}"
export MASTER_ADVERTISE_IP="${MASTER_ADVERTISE_IP:-$(getent hosts "${MASTER_ADVERTISE_ADDRESS}" | awk '{print $1; exit}')}"

# Define all your minion nodes,
# And separated with blank space like <user_1@ip_1> <user_2@ip_2> <user_3@ip_3>.
# The user should have sudo privilege
export NODES="${NODES:-"centos@172.10.0.12 centos@172.10.0.13"}"

# Number of nodes in your cluster.
export NUM_NODES="${NUM_NODES:-$(length-of "$NODES")}"

# Should be removed when NUM_NODES is deprecated in validate-cluster.sh
export NUM_NODES="${NUM_NODES}"

# By default, the cluster will use the etcd installed on master.
function concat-etcd-servers() {
  local etcd_servers=""
  for master in ${MASTERS}; do
    local master_ip=${master#*@}
    local prefix=""
    if [ -n "$etcd_servers" ]; then
      prefix="${etcd_servers},"
    fi
    etcd_servers="${prefix}https://${master_ip}:2379"
  done

  echo "$etcd_servers"
}
export ETCD_SERVERS="$(concat-etcd-servers)"

# By default, etcd cluster will use runtime configuration
#   https://coreos.com/etcd/docs/latest/v2/runtime-configuration.html
# Get etc initial cluster and store in ETCD_INITIAL_CLUSTER
function concat-etcd-initial-cluster() {
  local etcd_initial_cluster=""
  local num_infra=0
  for master in ${MASTERS}; do
    local master_ip="${master#*@}"
    if [ -n "$etcd_initial_cluster" ]; then
      etcd_initial_cluster+=","
    fi
    etcd_initial_cluster+="infra${num_infra}=https://${master_ip}:2380"
    let ++num_infra
  done

  echo "$etcd_initial_cluster"
}
export ETCD_INITIAL_CLUSTER="$(concat-etcd-initial-cluster)"

CERT_DIR="${CERT_DIR:-${root}/ca-cert}"
mkdir -p "${CERT_DIR}"
# CERT_DIR path must be absolute.
export CERT_DIR="$(cd "${CERT_DIR}"; pwd)"

# define the IP range used for service cluster IPs.
# according to rfc 1918 ref: https://tools.ietf.org/html/rfc1918 choose a private ip range here.
export SERVICE_CLUSTER_IP_RANGE=${SERVICE_CLUSTER_IP_RANGE:-"192.168.3.0/24"}

# Optional: Install cluster DNS.
ENABLE_CLUSTER_DNS="${KUBE_ENABLE_CLUSTER_DNS:-true}"
# DNS_SERVER_IP must be a IP in SERVICE_CLUSTER_IP_RANGE
DNS_SERVER_IP=${DNS_SERVER_IP:-"192.168.3.100"}
DNS_DOMAIN=${DNS_DOMAIN:-"cluster.local"}

# Optional: Install Kubernetes UI
ENABLE_CLUSTER_UI="${KUBE_ENABLE_CLUSTER_UI:-true}"

# define the IP range used for flannel overlay network, should not conflict with above SERVICE_CLUSTER_IP_RANGE
export FLANNEL_NET=${FLANNEL_NET:-"172.16.0.0/16"}

# Admission Controllers to invoke prior to persisting objects in cluster.
# MutatingAdmissionWebhook should be the last controller that modifies the
# request object, otherwise users will be confused if the mutating webhooks'
# modification is overwritten.
# If we included ResourceQuota, we should keep it at the end of the list to
# prevent incrementing quota usage prematurely.
export ADMISSION_CONTROL=${ADMISSION_CONTROL:-"Initializers,NamespaceLifecycle,LimitRanger,ServiceAccount,PersistentVolumeClaimResize,DefaultTolerationSeconds,Priority,StorageObjectInUseProtection,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota"}

# Extra options to set on the Docker command line.
# This is useful for setting --insecure-registry for local registries.
export DOCKER_OPTS=${DOCKER_OPTS:-""}


# Timeouts for process checking on master and minion
export PROCESS_CHECK_TIMEOUT=${PROCESS_CHECK_TIMEOUT:-180} # seconds.

unset -f default-advertise-address concat-etcd-servers length-of concat-etcd-initial-cluster