#!/bin/bash
set -eu
set -o pipefail

# Expects $1 to be in the format that oc get -o name outputs
sdn_underlay_ip(){
    oc get "${1}" -o template --template '{{.hostIP}}'
}

# Expects $1 to be in the format that oc get -o name outputs
sdn_overlay_ip(){
    local subnet=$(oc get "${1}" -o template --template '{{.subnet}}')

    # Subnet addresses always have by definition the last byte set to zero.
    # This means we can assume the last number of the address will always be
    # even, so for all we care we only need to handle '[02468]/[012]?[0-9]$'.
    echo "${subnet}" |  sed -E \
    -e 's@8/([012])?[0-9]$@9@' \
    -e 's@6/([012])?[0-9]$@7@' \
    -e 's@4/([012])?[0-9]$@5@' \
    -e 's@2/([012])?[0-9]$@3@' \
    -e 's@0/([012])?[0-9]$@1@'
}

do_sdn_node_connectivity_check() {
    for node in $(oc get hostsubnet -o name); do
        local success=overlay
        if ! ping $(sdn_overlay_ip "${node}") -w 2 -W 1 2>&1 >/dev/null ; then
            sucess=underlay
            if ! ping $(sdn_underlay_ip "${node}") -w 2 -W 1 2>&1 >/dev/null ; then
	              success=no
            fi
        fi

        if [[ "${success}" == "overlay" ]]; then
            echo "SUCCESS: Can ping ${node} on the overlay"
        elif [[ "${success}" == "underlay" ]]; then
            echo "FAIL: Cannot ping ${node} on the overlay but can reach it on the underlay."
        else
            echo "FAIL: Cannot ping ${node} on the overlay or the underlay."
        fi
    done
}

help()
{
    # Display Help
    echo
    echo "This script checks the node connectivity on a SDN cluster.
"
}

main () {
    BASE_COLLECTION_PATH="must-gather"
    logdir="$BASE_COLLECTION_PATH/openshift-sdn-node-connectivity"
    mkdir -p $logdir
    do_sdn_node_connectivity_check |& tee $logdir/log
}

while getopts ":h" option; do
    case $option in
        h) # display Help
            help
            exit;;
    esac
done

main
