pods

#!/bin/bash

# This tool is a variant of `kubectl get pods` and `kubectl get ksvc`.
# It executes both commands but only shows the entries of interest during
# a live demo. For example, it doesn't show Terminating pods.

set -e

once=""
# noclear=""
untilcmd=""
grepcmd=""

while [[ "$1" == "--"* ]]; do
    case "$1" in
    # --noclear) noclear="1" ;;
    --once)  once="1" ;;
    --until)  untilcmd="$2" ; shift ;;
    --grep)  grepcmd="$2" ; shift ;;
    *) echo "Uknown option '$1'" ; exit 1 ;;
    esac
    shift
done

# if [[ -z "${noclear}" ]]; then
    # clear
# fi

CLUSTER=${1:-${KUBECONFIG##*-}}
CLUSTER=${CLUSTER%.yml}
TMPFILE=/tmp/pods-tmp${RANDOM}

function finish {
  rm -f "${TMPFILE}"
  rm -f "${TMPFILE}.out"
}
trap finish EXIT

oldSize=0

if ! [[ "${KUBECONFIG}" == *"${CLUSTER}".yml ]]; then
  bx config --check-version false
  $(bx ks cluster-config -s --export ${CLUSTER})
fi

while true ; do
    printf "Cluster: ${CLUSTER}\033[K\\n" > $TMPFILE

    kubectl get ksvc --all-namespaces --no-headers < /dev/null > $TMPFILE.out 2>&1
    IKS=$'\r\n' eval 'NSs=($(grep -v NAME $TMPFILE.out | sed "s/ .*//" | sort -u))'

    printf "%-30s %-30s %-5s\033[K\\n" NS/NAME LATESTREADY READY  >> $TMPFILE
    cat $TMPFILE.out | while read ns name domain latestc latestr ready reason
    do
        [[ "${ns}" == "No" ]] && continue

        # Shorten 'default' namespaced names
        if [[ "${ns}" == "default" ]]; then
          ns=""
        else
          ns="${ns}/"
        fi

        printf "%-30s %-30s %-5s\033[K\\n" "${ns}${name}" "${latestr}" "${ready}" >> $TMPFILE
    done

    printf "\033[K\\n" >> $TMPFILE    # Blank line
    read -s -n 1 -t 0.01 ch || true
    if ! [[ "$ch" == "" ]]; then
        break
    fi

    printf "%-55s %-15s  %s\033[K\\n" POD_NAME STATUS AGE >> $TMPFILE
    for ns in "${NSs[@]}"
    do
        kubectl get pods -n $ns --no-headers < /dev/null 2>&1 | while read name ready status restarts age
        do
            [[ "${name}" == "No" ]] && continue
            [[ "${status}" == "Completed" ]] && continue
            [[ "${status}" == "Terminating" ]] && continue

            printf "%-55s %-15s  %s\033[K\\n" "${name}" "${status}" "${age}" >> $TMPFILE
        done
    done
    ! [[ "${PIPESTATUS[0]}" == "0" ]] && exit 1

    # printf "\033[K\\n" >> $TMPFILE   # Blank line

    if [[ "$oldSize" != "0" ]]; then
        printf "\033[%dA" "${oldSize}"
    fi
    newSize=$(wc -l "${TMPFILE}" | sed "s/ .*//")
    while (( oldSize > newSize )); do
        printf "\033[K\\n" >> $TMPFILE
        let oldSize=oldSize-1
    done
    cat $TMPFILE
    oldSize=$(wc -l "${TMPFILE}" | sed "s/ .*//")
    # rm -f $TMPFILE $TMPFILE.out

    if [[ -n "${once}" ]]; then
       break
    fi

    if [[ -n "${grepcmd}" ]]; then
        set +e
        grep "${grepcmd}" $TMPFILE > /dev/null 2>&1 && break
        set -e
    fi

    if [[ -n "$untilcmd" ]]; then
        set +e
        bash -c " ${untilcmd} " >/dev/null 2>&1 && break
        set -e
    fi

    read -s -n 1 -t 1 ch || true
    if ! [[ "$ch" == "" ]]; then
        break
    fi

done