#!/bin/bash
# file: epoch_h
#
# Copyright (C) 2015 Ubuntu Kylin
#
# Author: Min Chen <minchen@ubuntukylin.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Library Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Library Public License for more details.
#

my_dir=$(dirname "$0")
. $my_dir/common_h

#pgid_list=$single_node/$cluster-$id/pgid_list
function get_pgid_list()
{
  find $osd_data/current/ -type d -name "*_head"|\
	sed -n 's/\(.*\)\/current\/\([0-9a-fA-F]\+\.[0-9a-fA-F]\+\)_head/\2 \1/p'|\
	sort -t ' ' -k 1.1,1h -k 2.1,2 > $pgid_list;
}

function get_pgid()
{
  hobject_path=$1
  echo $hobject_path| sed -n 's/\(.*\)\/\([0-9a-fA-F]\+\.[0-9a-fA-F]\+\)_head\(.*\)/\2/p'
}

infos_seq=
function get_infos_seq()
{
  local func="get_infos_seq"
  
  local keyword=":infos." 
  local infos_key=`get_map_header_key $keyword`

  if [ "$infos_key"x = ""x ];then
    echo "$func: keyword not input or infos_key not exists"
    exit 
  fi
  local prefix=`get_map_header_prefix`
  local key=$infos_key

  infos_seq=`get_header_seq $prefix $key`
  if [ "$infos_seq"x = ""x ];then
    echo "$func: infos_seq not exists"
    exit
  fi
}

pg_epoch=
function get_pg_epoch()
{
  local func="get_pg_epoch"
  if [ "$1"x = ""x ];then
    echo "$func: no pgid input"
    exit
  fi

  get_pg_epoch_firefly "$1"
  if [ "$pg_epoch"x != ""x ]; then
    # echo "Epoch for $1: $pg_epoch (firefly)"
    return
  fi

  get_pg_epoch_hammer "$1"
  if [ "$pg_epoch"x != ""x ]; then
    # echo "Epoch for $1: $pg_epoch (hammer)"
    return
  fi

  echo "$func: Couldn't find epoch for $1"
  exit
}

function get_pg_epoch_firefly()
{
  local func="get_pg_epoch_firefly"
  if [ "$1"x = ""x ];then
    echo "$func: no pgid input"
    exit
  fi
  local pgid=$1
  local key=$pgid"_epoch"

  #get_infos_seq;
  # infos_seq default to 1
  infos_seq=1
  local infos_seq=`printf "%016d" $infos_seq`
  local prefix="_USER_"$infos_seq"_USER_"

  pg_epoch=`get_header_kv $prefix $key int`
}

function get_pg_epoch_hammer()
{
  local func="get_pg_epoch_hammer"
  if [ "$1"x = ""x ];then
    echo "$func: no pgid input"
    exit
  fi
  local pgid="$1"
  local hkey_prefix="$(get_map_header_prefix)"
  local hkey="$(printf '...head.%x.%08X' "$(echo "$pgid"|cut -d'.' -f1)" "$((0x$(echo "$pgid"|cut -d'.' -f2)))")"

  local infos_seq="$(get_header_seq "$hkey_prefix" "$hkey")"
  local infos_seq=`printf "%016d" $infos_seq`
  local prefix="_USER_"$infos_seq"_USER_"
  local key="_epoch"

  pg_epoch=`get_header_kv $prefix $key int`
}