#!/usr/bin/env bash

# Copyright 2014 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.

# A set of helpers for starting/running etcd for tests

ETCD_VERSION=${ETCD_VERSION:-3.2.18}
ETCD_HOST=${ETCD_HOST:-127.0.0.1}
ETCD_PORT=${ETCD_PORT:-2379}

kube::etcd::validate() {
  # validate if in path
  command -v etcd >/dev/null || {
    kube::log::usage "etcd must be in your PATH"
    exit 1
  }

  # validate etcd port is free
  local port_check_command
  if command -v ss &> /dev/null && ss -Version | grep 'iproute2' &> /dev/null; then
    port_check_command="ss"
  elif command -v netstat &>/dev/null; then
    port_check_command="netstat"
  else
    kube::log::usage "unable to identify if etcd is bound to port ${ETCD_PORT}. unable to find ss or netstat utilities."
    exit 1
  fi
  if ${port_check_command} -nat | grep "LISTEN" | grep "[\.:]${ETCD_PORT:?}" >/dev/null 2>&1; then
    kube::log::usage "unable to start etcd as port ${ETCD_PORT} is in use. please stop the process listening on this port and retry."
    kube::log::usage "`netstat -nat | grep "[\.:]${ETCD_PORT:?} .*LISTEN"`"
    exit 1
  fi

  # validate installed version is at least equal to minimum
  version=$(etcd --version | tail -n +1 | head -n 1 | cut -d " " -f 3)
  if [[ $(kube::etcd::version $ETCD_VERSION) -gt $(kube::etcd::version $version) ]]; then
   export PATH=$KUBE_ROOT/third_party/etcd:$PATH
   hash etcd
   echo $PATH
   version=$(etcd --version | head -n 1 | cut -d " " -f 3)
   if [[ $(kube::etcd::version $ETCD_VERSION) -gt $(kube::etcd::version $version) ]]; then
    kube::log::usage "etcd version ${ETCD_VERSION} or greater required."
    kube::log::info "You can use 'hack/install-etcd.sh' to install a copy in third_party/."
    exit 1
   fi
  fi
}

kube::etcd::version() {
  printf '%s\n' "${@}" | awk -F . '{ printf("%d%03d%03d\n", $1, $2, $3) }'
}

kube::etcd::start() {
  # validate before running
  kube::etcd::validate

  # Start etcd
  ETCD_DIR=${ETCD_DIR:-$(mktemp -d 2>/dev/null || mktemp -d -t test-etcd.XXXXXX)}
  if [[ -d "${ARTIFACTS_DIR:-}" ]]; then
    ETCD_LOGFILE="${ARTIFACTS_DIR}/etcd.$(uname -n).$(id -un).log.DEBUG.$(date +%Y%m%d-%H%M%S).$$"
  else
    ETCD_LOGFILE=/dev/null
  fi
  kube::log::info "etcd --advertise-client-urls http://${ETCD_HOST}:${ETCD_PORT} --data-dir ${ETCD_DIR} --listen-client-urls http://${ETCD_HOST}:${ETCD_PORT} --debug > \"${ETCD_LOGFILE}\" 2>/dev/null"
  etcd --advertise-client-urls http://${ETCD_HOST}:${ETCD_PORT} --data-dir ${ETCD_DIR} --listen-client-urls http://${ETCD_HOST}:${ETCD_PORT} --debug 2> "${ETCD_LOGFILE}" >/dev/null &
  ETCD_PID=$!

  echo "Waiting for etcd to come up."
  kube::util::wait_for_url "http://${ETCD_HOST}:${ETCD_PORT}/v2/machines" "etcd: " 0.25 80
  curl -fs -X PUT "http://${ETCD_HOST}:${ETCD_PORT}/v2/keys/_test"
}

kube::etcd::stop() {
  if [[ -n "${ETCD_PID-}" ]]; then
    kill "${ETCD_PID}" &>/dev/null || :
    wait "${ETCD_PID}" &>/dev/null || :
  fi
}

kube::etcd::clean_etcd_dir() {
  if [[ -n "${ETCD_DIR-}" ]]; then
    rm -rf "${ETCD_DIR}"
  fi
}

kube::etcd::cleanup() {
  kube::etcd::stop
  kube::etcd::clean_etcd_dir
}

kube::etcd::install() {
  (
    cd "${KUBE_ROOT}/third_party"
    if [[ $(readlink etcd) == etcd-v${ETCD_VERSION}-* ]]; then
      return  # already installed
    fi
    if [[ $(uname) == "Darwin" ]]; then
      download_file="etcd-v${ETCD_VERSION}-darwin-amd64.zip"
      url="https://github.com/coreos/etcd/releases/download/v${ETCD_VERSION}/${download_file}"
      kube::util::download_file "${url}" "${download_file}"
      unzip -o "${download_file}"
      ln -fns "etcd-v${ETCD_VERSION}-darwin-amd64" etcd
      rm "${download_file}"
    else
      url="https://github.com/coreos/etcd/releases/download/v${ETCD_VERSION}/etcd-v${ETCD_VERSION}-linux-amd64.tar.gz"
      download_file="etcd-v${ETCD_VERSION}-linux-amd64.tar.gz"
      kube::util::download_file "${url}" "${download_file}"
      tar xzf "${download_file}"
      ln -fns "etcd-v${ETCD_VERSION}-linux-amd64" etcd
    fi
    kube::log::info "etcd v${ETCD_VERSION} installed. To use:"
    kube::log::info "export PATH=$(pwd)/etcd:\${PATH}"
  )
}