74 lines
2.5 KiB
Bash
74 lines
2.5 KiB
Bash
#!/bin/sh
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# router.sh — POSIX sh HTTP backend (for socat)
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# usage: socat -T5 -t5 TCP-LISTEN:${port},reuseaddr,fork EXEC:"sh ${currentfile}"
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# Routes:
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# GET /status -> check $URLS (0/0 if unset)
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# GET /disk -> check $VOLUMES (all if unset)
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# Env:
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# URLS="http://..." # default: none
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# VOLUMES="/ /home" # default: all from df -P
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# TIMEOUT=5
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TIMEOUT=${TIMEOUT:-5}
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[ -n "$VOLUMES" ] || VOLUMES=$(df -P | awk 'NR>1{print $6}')
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route_status() {
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if [ -z "$URLS" ]; then
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printf '{\n "checks": [],\n "summary":{"total":0,"ok":0}\n}\n'
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return
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fi
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{
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printf '{\n "checks": [\n'
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first=1 okcnt=0 tot=0
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for u in $URLS; do
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tot=$((tot+1))
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res=$(curl -sS -m "$TIMEOUT" -o /dev/null -w '%{http_code} %{time_total}' "$u" 2>/dev/null) || res="000 0"
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code=${res%% *}; ttot=${res#* }
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case $code in 2*|3*) ok=true; okcnt=$((okcnt+1));; *) ok=false;; esac
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[ $first -eq 0 ] && printf ',\n'; first=0
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printf ' {"url":"%s","code":%s,"time_s":%s,"ok":%s}' "$u" "$code" "$ttot" "$ok"
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done
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printf '\n ],\n "summary":{"total":%s,"ok":%s}\n}\n' "$tot" "$okcnt"
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}
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}
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route_disk() {
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{
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printf '{\n "volumes": [\n'
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first=1
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for v in $VOLUMES; do
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# POSIX df -P: Filesystem 1K-blocks Used Available Capacity Mounted on
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# shellcheck disable=SC2046
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set -- $(df -P "$v" 2>/dev/null | awk 'NR==2{print $2, $3, $4, $5, $6}')
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size=$1 used=$2 avail=$3 usep=$4 mnt=$5
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[ -z "$size" ] && continue
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[ $first -eq 0 ] && printf ',\n'; first=0
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printf ' {"mount":"%s","size_blocks":%s,"used":%s,"avail":%s,"use_percent":"%s"}' \
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"$mnt" "$size" "$used" "$avail" "$usep"
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done
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printf '\n ]\n}\n'
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}
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}
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# --- read request & headers ---
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IFS= read -r req || exit 0
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cr=$(printf '\r')
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while IFS= read -r line; do
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[ -z "$line" ] && break
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[ "$line" = "$cr" ] && break
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done
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tmp=$(mktemp) || exit 1
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trap 'rm -f "$tmp"' EXIT INT HUP
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case "$req" in
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"GET /status "*) route_status >"$tmp"; status='200 OK'; ctype='application/json' ;;
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"GET /disk "*) route_disk >"$tmp"; status='200 OK'; ctype='application/json' ;;
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*) printf 'Not found\n' >"$tmp"; status='404 Not Found'; ctype='text/plain' ;;
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esac
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len=$(wc -c <"$tmp" | awk '{print $1}')
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printf 'HTTP/1.1 %s\r\nContent-Type: %s\r\nContent-Length: %s\r\nConnection: close\r\n\r\n' "$status" "$ctype" "$len"
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cat "$tmp"
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