#!/usr/bin/env bash
### Copyright 2010 Manuel Carrasco Moñino. (manolo at apache.org)
###
### Licensed under the Apache License, Version 2.0.
### You may obtain a copy of it at
### http://www.apache.org/licenses/LICENSE-2.0

###
### A library for shell scripts which creates reports in jUnit format.
### These reports can be used in Jenkins, or any other CI.
###
### Usage:
###     - Include this file in your shell script
###     - Use juLog to call your command any time you want to produce a new report
###        Usage:   juLog <options> command arguments
###           options:
###             -class="MyClass" : a class name which will be shown in the junit report
###             -name="TestName" : the test name which will be shown in the junit report
###             -error="RegExp"  : a regexp which sets the test as failure when the output matches it
###             -ierror="RegExp" : same as -error but case insensitive
###             -fail="RegExp"   : Any line from stderr which contains this pattern becomes part of
###                                the failure messsage, without the text matching that pattern.
###                                Example: -failure="^ERROR: "
###                                Default is to use the entire stderr as failure message.
###             -output="Path"   : path to output directory, defaults to "./results"
###     - Junit reports are left in the folder 'result' under the directory where the script is executed.
###     - Configure Jenkins to parse junit files from the generated folder
###

asserts=00; errors=0; total=0; content=""
date="$(which gdate 2>/dev/null || which date)"

# default output folder
juDIR="$(pwd)/results"

# The name of the suite is calculated based in your script name
suite=""

if LANG=C sed --help 2>&1 | grep -q GNU; then
  SED="sed"
elif which gsed &>/dev/null; then
  SED="gsed"
else
  echo "Failed to find GNU sed as sed or gsed. If you are on Mac: brew install gnu-sed." >&2
  exit 1
fi

# A wrapper for the eval method witch allows catching seg-faults and use tee
errfile=/tmp/evErr.$$.log
function eVal() {
  (eval "$1")
  # stdout and stderr may currently be inverted (see below) so echo may write to stderr
  echo "$?" 2>&1 | tr -d "\n" > "${errfile}"
}

# Method to clean old tests
function juLogClean() {
  echo "+++ Removing old junit reports from: ${juDIR} "
  rm -f "${juDIR}"/junit-*
}

# Execute a command and record its results
function juLog() {
  suite="";
  errfile=/tmp/evErr.$$.log
  date="$(which gdate 2>/dev/null || which date)"
  asserts=00; errors=0; total=0; content=""
  local failureRe=""

  # parse arguments
  ya=""; icase=""
  while [[ -z "$ya" ]]; do
    case "$1" in
      -name=*)   name="$(echo "$1" | ${SED} -e 's/-name=//')";   shift;;
      -class=*)  class="$(echo "$1" | ${SED} -e 's/-class=//')";   shift;;
      -ierror=*) ereg="$(echo "$1" | ${SED} -e 's/-ierror=//')"; icase="-i"; shift;;
      -error=*)  ereg="$(echo "$1" | ${SED} -e 's/-error=//')";  shift;;
      -fail=*)  failureRe="$(echo "$1" | ${SED} -e 's/-fail=//')";  shift;;
      -output=*) juDIR="$(echo "$1" | ${SED} -e 's/-output=//')";  shift;;
      *)         ya=1;;
    esac
  done

  # create output directory
  mkdir -p "${juDIR}" || exit
  # use first arg as name if it was not given
  if [[ -z "${name}" ]]; then
    name="${asserts}-$1"
    shift
  fi

  if [[ "${class}" = "" ]]; then
    class="default"
  fi

  suite=${class}

  # calculate command to eval
  [[ -z "$1" ]] && return
  cmd="$1"; shift
  while [[ -n "${1:-}" ]]
  do
     cmd="${cmd} \"$1\""
     shift
  done

  # eval the command sending output to a file
  outf=/var/tmp/ju$$.txt
  errf=/var/tmp/ju$$-err.txt
  :>${outf}
  echo ""                         | tee -a ${outf}
  echo "+++ Running case: ${class}.${name} " | tee -a ${outf}
  echo "+++ working dir: $(pwd)"           | tee -a ${outf}
  echo "+++ command: ${cmd}"            | tee -a ${outf}
  ini="$(${date} +%s.%N)"
  # execute the command, temporarily swapping stderr and stdout so they can be tee'd to separate files,
  # then swapping them back again so that the streams are written correctly for the invoking process
  ( (eVal "${cmd}" | tee -a ${outf}) 3>&1 1>&2 2>&3 | tee ${errf}) 3>&1 1>&2 2>&3
  evErr="$(cat ${errfile})"
  rm -f ${errfile}
  end="$(${date} +%s.%N)"
  echo "+++ exit code: ${evErr}"        | tee -a ${outf}

  # set the appropriate error, based in the exit code and the regex
  [[ ${evErr} -ne 0 ]] && err=1 || err=0
  out="$(${SED} -e 's/^\([^+]\)/| \1/g' "$outf")"
  if [ "${err}" -eq 0 ] && [ -n "${ereg:-}" ]; then
      H=$(echo "${out}" | grep -E ${icase} "${ereg}")
      [[ -n "${H}" ]] && err=1
  fi
  [[ ${err} -ne 0 ]] && echo "+++ error: ${err}"         | tee -a ${outf}
  rm -f ${outf}

  errMsg=$(cat ${errf})
  rm -f ${errf}
  # calculate vars
  asserts=$((asserts+1))
  errors=$((errors+err))
  time=$(echo "${end} ${ini}" | awk '{print $1 - $2}')
  total=$(echo "${total} ${time}" | awk '{print $1 + $2}')

  # write the junit xml report
  ## failure tag
  local failure=""
  if [[ ${err} -ne 0 ]]; then
      local failureMsg
      if [ -n "${failureRe}" ]; then
          failureMsg="$(echo "${errMsg}" | grep -e "${failureRe}" | ${SED} -e "s;${failureRe};;")"
          if [ -z "${failureMsg}" ]; then
              failureMsg="see stderr for details"
          fi
      else
          failureMsg="${errMsg}"
      fi
      failure="
      <failure type=\"ScriptError\"><![CDATA[
${failureMsg}
]]></failure>
  "
  fi
  ## testcase tag
  content="${content}
    <testcase assertions=\"1\" name=\"${name}\" time=\"${time}\" classname=\"${class}\">
    ${failure}
    <system-err><![CDATA[${errMsg}]]></system-err>
    </testcase>
  "
  ## testsuite block

  if [[ -e "${juDIR}/junit_${suite}.xml" ]]; then
    # file exists. first update the failures count
    failCount=$(${SED} -n "s/.*testsuite.*failures=\"\([0-9]*\)\".*/\1/p" "${juDIR}/junit_${suite}.xml")
    errors=$((failCount+errors))
    ${SED} -i "0,/failures=\"${failCount}\"/ s/failures=\"${failCount}\"/failures=\"${errors}\"/" "${juDIR}/junit_${suite}.xml"
    ${SED} -i "0,/errors=\"${failCount}\"/ s/errors=\"${failCount}\"/errors=\"${errors}\"/" "${juDIR}/junit_${suite}.xml"

    # file exists. Need to append to it. If we remove the testsuite end tag, we can just add it in after.
    ${SED} -i "s^</testsuite>^^g" "${juDIR}/junit_${suite}.xml" ## remove testSuite so we can add it later
    ${SED} -i "s^</testsuites>^^g" "${juDIR}/junit_${suite}.xml"
    cat <<EOF >> "$juDIR/junit_$suite.xml"
     ${content:-}
    </testsuite>
</testsuites>
EOF

  else
    # no file exists. Adding a new file
    cat <<EOF > "${juDIR}/junit_${suite}.xml"
<?xml version="1.0" encoding="UTF-8"?>
<testsuites>
    <testsuite failures="${errors}" assertions="${assertions:-}" name="${suite}" tests="1" errors="${errors}" time="${total}">
    ${content:-}
    </testsuite>
</testsuites>
EOF
  fi

  return "${err}"
}