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#!/bin/bash
#
#   rankmirrors - read a list of mirrors from a file and rank them by speed
#   @configure_input@
#
#   Copyright (c) 2009 Matthew Bruenig <matthewbruenig@gmail.com>
#
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 3 of the License, 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 General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.

# traps interrupt key to spit out pre-interrupt info
trap finaloutput INT

declare -r myname='rankmirrors'
declare -r myver='@PACKAGE_VERSION@'

usage() {
  echo "${myname} (pacman) v${myver}"
  echo
  echo "Ranks pacman mirrors by their connection and opening speed. Pacman mirror"
  echo "files are located in @sysconfdir@/pacman.d/. It can also rank one mirror if the URL is"
  echo "provided."
  echo
  echo "Usage: ${myname} [options] MIRRORFILE | URL"
  echo
  echo "Options:"
  echo "  --version      show program's version number and exit"
  echo "  -h, --help     show this help message and exit"
  echo "  -n NUM         number of servers to output, 0 for all"
  echo "  -t, --times    only output mirrors and their response times"
  echo "  -u, --url      test a specific URL"
  echo "  -v, --verbose  be verbose in ouptut"
  echo "  -r, --repo     specify a repository name instead of guessing"
  exit 0
}

version() {
  echo "${myname} (pacman) ${myver}"
  echo "Copyright (c) 2009 Matthew Bruenig <matthewbruenig@gmail.com>."
  echo
  echo "This is free software; see the source for copying conditions."
  echo "There is NO WARRANTY, to the extent permitted by law."
  exit 0
}

err() {
  echo "$1" >&2
  exit 1
}

# gettime fetchurl (e.g gettime http://foo.com/core/os/i686/core.db.tar.gz)
# returns the fetching time, or timeout, or unreachable
gettime() {
  IFS=' ' output=( $(curl -s -m 10 -w "%{time_total} %{http_code}" "$1" -o/dev/null) )
  (( $? == 28 )) && echo timeout && return
  (( ${output[1]} >= 400 || ! ${output[1]} )) && echo unreachable && return
  echo "${output[0]}"
}

# getfetchurl serverurl (e.g. getturl http://foo.com/core/os/i686)
# if $repo is in the line, then assumes core
# if $arch is in the line, then assumes $(uname -m)
# returns a fetchurl (e.g. http://foo.com/core/os/i686/core.db.tar.gz)
ARCH="$(uname -m)"
getfetchurl() {
  local strippedurl="${1%/}"

  local replacedurl="${strippedurl//'$arch'/$ARCH}"
  if [[ ! $TARGETREPO ]]; then
    replacedurl="${replacedurl//'$repo'/core}"
    local tmp="${replacedurl%/*}"
    tmp="${tmp%/*}"

    local reponame="${tmp##*/}"
  else
    replacedurl="${replacedurl//'$repo'/$TARGETREPO}"
    local reponame="$TARGETREPO"
  fi

  if [[ -z $reponame || $reponame = $replacedurl ]]; then
    echo "fail"
  else
    local fetchurl="${replacedurl}/$reponame.db"
    echo "$fetchurl"
  fi
}

# This exists to remove the need for a separate interrupt function
finaloutput() {
  IFS=$'\n' read -r -d '' -a sortedarray < \
    <(printf '%s\n' "${timesarray[@]}" | LC_COLLATE=C sort)

  # Final output for mirrorfile
  numiterator="0"
  if [[ $TIMESONLY ]]; then
    echo
    echo " Servers sorted by time (seconds):"
    for line in "${sortedarray[@]}"; do
      echo "${line#* } : ${line% *}"
      ((numiterator++))
      (( NUM && numiterator >= NUM )) && break
    done
  else
    for line in "${sortedarray[@]}"; do
      echo "Server = ${line#* }"
      ((numiterator++))
      (( NUM && numiterator >= NUM )) && break
    done
  fi
  exit 0
}


# Argument parsing
[[ $1 ]] || usage
while [[ $1 ]]; do
  if [[ ${1:0:2} = -- ]]; then
    case "${1:2}" in
      help) usage ;;
      version) version ;;
      times) TIMESONLY=1 ; shift ;;
      verbose) VERBOSE=1 ; shift ;;
      url) CHECKURL=1; [[ $2 ]] || err "Must specify url."; URL="$2"; shift 2;;
      repo) [[ $2 ]] || err "Must specify repo name."; TARGETREPO="$2"; shift 2;;
      *) err "'$1' is an invalid argument."
    esac
  elif [[ ${1:0:1} = - ]]; then

    if [[ ! ${1:1:1} ]]; then
      [[ -t 0 ]] && err "Stdin is empty."
      IFS=$'\n' linearray=( $(</dev/stdin) )
      STDIN=1
      shift
    else
      snum=1
      for ((i=1 ; i<${#1}; i++)); do
        case ${1:$i:1} in
          h) usage ;;
          t) TIMESONLY=1 ;;
          v) VERBOSE=1 ;;
          u) CHECKURL=1; [[ $2 ]] || err "Must specify url."; URL="$2"; snum=2;;
          r) [[ $2 ]] || err "Must specify repo name."; TARGETREPO="$2"; snum=2;;
          n) [[ $2 ]] || err "Must specify number." ; NUM="$2" ; snum=2;;
          *) err "'$1' is an invalid argument." ;;
        esac
      done
      shift $snum
    fi
  elif [[ -f $1 ]]; then
    FILE="1"
    IFS=$'\n' linearray=( $(<$1) )
    [[ $linearray ]] || err "File is empty."
    shift
  else
    err "'$1' does not exist."
  fi
done

# Some sanity checks
[[ $NUM ]] || NUM=0
[[ $FILE && $CHECKURL ]] && err "Cannot specify a url and mirrorfile."
[[ $FILE || $CHECKURL || $STDIN ]] || err "Must specify url, mirrorfile, or stdin."

# Single url handling
if [[ $CHECKURL ]]; then
  url="$(getfetchurl "$URL")"
  [[ $url = fail ]] && err "url '$URL' is malformed."
  [[ $VERBOSE ]] && echo "Testing $url..."
  time=$(gettime "$url")
  echo "$URL : $time"
  exit 0
fi

# Get url results from mirrorfile, fill up the array, and so on
if [[ $TIMESONLY ]]; then
  echo "Querying servers, this may take some time..."
elif [[ $FILE ]]; then
  echo "# Server list generated by rankmirrors on $(date +%Y-%m-%d)"
fi

timesarray=()
for line in "${linearray[@]}"; do
  if [[ $line =~ ^[[:space:]]*# ]]; then
    [[ $TIMESONLY ]] || echo $line
  elif [[ $line =~ ^[[:space:]]*Server ]]; then

    # Getting values and times and such
    server="${line#*= }"
    server="${server%%#*}"
    url="$(getfetchurl "$server")"
    [[ $url = fail ]] && err "url '$URL' is malformed."
    time=$(gettime "$url")
    timesarray+=("$time $server")

    # Output
    if [[ $VERBOSE && $TIMESONLY ]]; then
      echo "$server ... $time"
    elif [[ $VERBOSE ]]; then
      echo "# $server ... $time"
    elif [[ $TIMESONLY ]]; then
      echo -n "   *"
    fi
  fi
done
finaloutput

# vim: set ts=2 sw=2 noet: