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#!/bin/bash
# Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#
# Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
# BEGIN environment bootstrap section
# Do not edit between here and END as this section should stay identical in all scripts
findpath () {
myname=${0}
mypath=${myname%/*}
myname=${myname##*/}
empty_if_start_slash=${mypath%%/*}
if [ "${empty_if_start_slash}" ]; then
mypath=$(pwd)/${mypath}
fi
if [ "$mypath" ] && [ -d "$mypath" ]; then
return
fi
mypath=$(pwd)
if [ -f "${mypath}/${myname}" ]; then
return
fi
echo "FATAL: Could not figure out the path where $myname lives from $0"
exit 1
}
COMMON_ENV=libexec/vespa/common-env.sh
source_common_env () {
if [ "$VESPA_HOME" ] && [ -d "$VESPA_HOME" ]; then
export VESPA_HOME
common_env=$VESPA_HOME/$COMMON_ENV
if [ -f "$common_env" ]; then
. $common_env
return
fi
fi
return 1
}
findroot () {
source_common_env && return
if [ "$VESPA_HOME" ]; then
echo "FATAL: bad VESPA_HOME value '$VESPA_HOME'"
exit 1
fi
if [ "$ROOT" ] && [ -d "$ROOT" ]; then
VESPA_HOME="$ROOT"
source_common_env && return
fi
findpath
while [ "$mypath" ]; do
VESPA_HOME=${mypath}
source_common_env && return
mypath=${mypath%/*}
done
echo "FATAL: missing VESPA_HOME environment variable"
echo "Could not locate $COMMON_ENV anywhere"
exit 1
}
findhost () {
if [ "${VESPA_HOSTNAME}" = "" ]; then
VESPA_HOSTNAME=$(vespa-detect-hostname || hostname -f || hostname || echo "localhost") || exit 1
fi
validate="${VESPA_HOME}/bin/vespa-validate-hostname"
if [ -f "$validate" ]; then
"$validate" "${VESPA_HOSTNAME}" || exit 1
fi
export VESPA_HOSTNAME
}
findroot
findhost
ROOT=${VESPA_HOME%/}
export ROOT
# END environment bootstrap section
set -eu
declare LB_STATUS_DIR="$VESPA_HOME"/var/vespa/load-balancer
declare LB_STATUS_FILE="$LB_STATUS_DIR"/status.html
declare LB_OPERATOR_LOG="$LB_STATUS_DIR"/operator.log
function Usage {
cat <<EOF
Usage: ${0##*/} COMMAND [-u USER] [-f]
Make jdisc container stop serving /status.html.
Useful when jdisc container is behind a load balancer: The load balancer can be
set up to monitor the health of /status.html requests, and remove bad backends
from serving.
Command:
get Return info on the current in/out status.
in Undo 'out'. This command is a no-op if 1. status is already in, or 2.
if the the user that set it out is different from USER and -f was NOT
specified.
out Stop answering OK on /status.html requests against jdisc container.
Note: The jdisc container may not answer OK for other reasons too.
Options:
-u USER Set the user agent. The user setting the status in, must match
the user that set it out. Defaults to current user.
-f Force-set status: Ignore any mismatch on user.
EOF
exit 0
}
function PrintPair {
printf "%-19s %s\n" "$1:" "$2"
}
function IsIn {
if [ -r "$LB_STATUS_FILE" ]; then
return 0
else
return 1
fi
}
function DifferentUserSetOut {
local user="$1"
if [ -r "$LB_OPERATOR_LOG" ]; then
local out_user
out_user=$(< "$LB_OPERATOR_LOG")
if [ "$user" != "$out_user" ]; then
return 0
fi
fi
return 1
}
function GetCommand {
if IsIn; then
PrintPair "VIP status" IN
else
PrintPair "VIP status" OUT
fi
PrintPair "Status file" "$LB_STATUS_FILE"
if [ -r "$LB_OPERATOR_LOG" ]; then
PrintPair "Last modified" "$(stat -c %y "$LB_OPERATOR_LOG")"
PrintPair "Last modified by" "$(< "$LB_OPERATOR_LOG")"
fi
}
function InCommand {
local user="$1"
local force="$2"
if ! $force; then
if IsIn || DifferentUserSetOut "$user"; then
return
fi
fi
mkdir -p "$LB_STATUS_DIR"
echo "$user" > "$LB_OPERATOR_LOG"
echo OK > "$LB_STATUS_FILE"
}
function OutCommand {
local user="$1"
local force="$2"
if ! $force && ! IsIn; then
return
fi
mkdir -p "$LB_STATUS_DIR"
echo "$user" > "$LB_OPERATOR_LOG"
rm -f "$LB_STATUS_FILE"
}
function Main {
if (($# == 0)); then
Usage
fi
local command=
local user="${SUDO_USER:-${USER:-$(id -nu)}}"
local force=false
# Supports placement of options both before and after command.
while (($# > 0)); do
case "$1" in
-f)
force=true
shift
;;
-u)
user="$2"
shift 2
;;
-*) Usage "Unknown option '$1'" ;;
*)
case "$1" in
get) command="GetCommand" ;;
in) command="InCommand" ;;
out) command="OutCommand" ;;
*) Usage ;;
esac
shift
;;
esac
done
if [ -z "$command" ]; then
Usage
fi
"$command" "$user" "$force"
}
Main "$@"
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