#!/bin/bash
: ${HEALTHCHECK_CURL_MAX_TIME:=10}
: ${HEALTHCHECK_CURL_USER_AGENT:=curl-healthcheck}
: ${HEALTHCHECK_CURL_WRITE_OUT:='\n%{http_code} %{remote_ip}:%{remote_port} %{time_total} seconds\n'}
: ${HEALTHCHECK_CURL_OUTPUT:='/dev/null'}

healthcheck_curl () {
    export NSS_SDB_USE_CACHE=no
    curl -g -k -q -s -S --fail -o "${HEALTHCHECK_CURL_OUTPUT}" \
        --max-time "${HEALTHCHECK_CURL_MAX_TIME}" \
        --user-agent "${HEALTHCHECK_CURL_USER_AGENT}" \
        --write-out "${HEALTHCHECK_CURL_WRITE_OUT}" \
        "$@" || return 1
}

healthcheck_port () {
    process=$1

    shift 1
    args=$@
    ports=${args// /|}
    pids=$(pgrep -d '|' -f $process)
    ss -ntp | grep -qE ":($ports).*,pid=($pids),"
}

healthcheck_listen () {
    process=$1

    shift 1
    args=$@
    ports=${args// /|}
    pids=$(pgrep -d '|' -f $process)
    ss -lnp | grep -qE ":($ports).*,pid=($pids),"
}

healthcheck_socket () {
    process=$1
    socket=$2

    # lsof truncate command name to 15 characters and this behaviour
    # cannot be disabled
    if [ ${#process} -gt 15 ] ; then
        process=${process:0:15}
    fi
    lsof -Fc -Ua $socket | grep -q "c$process"
}

healthcheck_file_modification () {
    file_path=$1
    limit_seconds=$2

    # if the file doesn't exist, return 1
    if [ ! -f $file_path ]; then
        echo "${file_path} does not exist for file modification check"
        return 1
    fi
    curr_time=$(date +%s)
    last_mod=$(stat -c '%Y' $file_path)
    limit_epoch=$(( curr_time-limit_seconds ))
    if [ ${limit_epoch} -gt ${last_mod} ]; then
        return 1
    fi
}

get_config_val () {
    crudini --get "$1" "$2" "$3" 2> /dev/null || echo "$4"
}

# apachectl -S is slightly harder to parse and doesn't say if the vhost is serving SSL
get_url_from_vhost () {
    vhost_file=$1
    server_name=$(awk '/ServerName/ {print $2}' $vhost_file)
    ssl_enabled=$(awk '/SSLEngine/ {print $2}' $vhost_file)
    bind_port=$(grep -h "<VirtualHost .*>" $vhost_file | sed 's/<VirtualHost .*:\(.*\)>/\1/')
    wsgi_alias=$(awk '/WSGIScriptAlias/ {print $2}' $vhost_file)
    proto=http
    if [[ $ssl_enabled == "on" ]]; then
        proto=https
    fi
    if [[ $wsgi_alias != "/" ]]; then
        wsgi_alias="${wsgi_alias}/"
    fi
    echo ${proto}://${server_name}:${bind_port}${wsgi_alias}
}