get-nodes

#!/bin/bash

# cmd='
# [foreach .items[] as $item
# ([[],[]];0;
# if ($item.kind == "Node") then
#  [([(foreach $item.status.addresses[] as $address
#   ([[],[]];0;
#   if $address.type == "ExternalIP" then $address.address else null end)),
#   (foreach $item.status.addresses[] as $address
#   ([[],[]];0;
#   if $address.type == "InternalIP" then $address.address else null end))])] | flatten | map (select (. != null))[0]
#  else null end)]|flatten | map(select (. != null))[]'

# shellcheck disable=SC2016
cmd='
[foreach .items[] as $item
([[],[]];0;
if ($item.kind == "Node") then
 [([(foreach $item.status.addresses[] as $address
  ([[],[]];0;
  if $address.type == "ExternalIP" then $address.address else null end))])] | flatten | map (select (. != null))[0]
 else null end)]|flatten | map(select (. != null))[]'

out="$(oc get nodes -o json | jq -r "$cmd")"

[[ -z "$out" ]] && {
    # shellcheck disable=SC2016
    cmd='
[foreach .items[] as $item
([[],[]];0;
if ($item.kind == "Node") then
 [([(foreach $item.status.addresses[] as $address
  ([[],[]];0;
  if $address.type == "ExternalIP" then $address.address else null end)),
  (foreach $item.status.addresses[] as $address
  ([[],[]];0;
  if $address.type == "InternalIP" then $address.address else null end))])] | flatten | map (select (. != null))[0]
 else null end)]|flatten | map(select (. != null))[]'
  out="$(oc get nodes -o json | jq -r "$cmd")"
}
echo "$out"