feat(package): server-health: created

package/server-health/server-health.sh

@@ -0,0 +1,73 @@
+#!/bin/sh
+# router.sh — POSIX sh HTTP backend (for socat)
+# usage: socat -T5 -t5 TCP-LISTEN:${port},reuseaddr,fork EXEC:"sh ${currentfile}"
+# Routes:
+#   GET /status  -> check $URLS (0/0 if unset)
+#   GET /disk    -> check $VOLUMES (all if unset)
+# Env:
+#   URLS="http://..."     # default: none
+#   VOLUMES="/ /home"     # default: all from df -P
+#   TIMEOUT=5
+
+TIMEOUT=${TIMEOUT:-5}
+[ -n "$VOLUMES" ] || VOLUMES=$(df -P | awk 'NR>1{print $6}')
+
+route_status() {
+    if [ -z "$URLS" ]; then
+        printf '{\n  "checks": [],\n  "summary":{"total":0,"ok":0}\n}\n'
+        return
+    fi
+    {
+        printf '{\n  "checks": [\n'
+        first=1 okcnt=0 tot=0
+        for u in $URLS; do
+            tot=$((tot+1))
+            res=$(curl -sS -m "$TIMEOUT" -o /dev/null -w '%{http_code} %{time_total}' "$u" 2>/dev/null) || res="000 0"
+            code=${res%% *}; ttot=${res#* }
+            case $code in 2*|3*) ok=true; okcnt=$((okcnt+1));; *) ok=false;; esac
+            [ $first -eq 0 ] && printf ',\n'; first=0
+            printf '    {"url":"%s","code":%s,"time_s":%s,"ok":%s}' "$u" "$code" "$ttot" "$ok"
+        done
+        printf '\n  ],\n  "summary":{"total":%s,"ok":%s}\n}\n' "$tot" "$okcnt"
+    }
+}
+
+route_disk() {
+    {
+        printf '{\n  "volumes": [\n'
+        first=1
+        for v in $VOLUMES; do
+	    # POSIX df -P: Filesystem 1K-blocks Used Available Capacity Mounted on
+	    # shellcheck disable=SC2046
+            set -- $(df -P "$v" 2>/dev/null | awk 'NR==2{print $2, $3, $4, $5, $6}')
+            size=$1 used=$2 avail=$3 usep=$4 mnt=$5
+            [ -z "$size" ] && continue
+            [ $first -eq 0 ] && printf ',\n'; first=0
+            printf '    {"mount":"%s","size_blocks":%s,"used":%s,"avail":%s,"use_percent":"%s"}' \
+              "$mnt" "$size" "$used" "$avail" "$usep"
+        done
+        printf '\n  ]\n}\n'
+    }
+}
+
+# --- read request & headers ---
+IFS= read -r req || exit 0
+cr=$(printf '\r')
+while IFS= read -r line; do
+  [ -z "$line" ] && break
+  [ "$line" = "$cr" ] && break
+done
+
+tmp=$(mktemp) || exit 1
+trap 'rm -f "$tmp"' EXIT INT HUP
+
+case "$req" in
+  "GET /status "*) route_status >"$tmp"; status='200 OK'; ctype='application/json' ;;
+  "GET /disk "*)   route_disk   >"$tmp"; status='200 OK'; ctype='application/json' ;;
+  *)               printf 'Not found\n' >"$tmp"; status='404 Not Found'; ctype='text/plain' ;;
+esac
+
+len=$(wc -c <"$tmp" | awk '{print $1}')
+printf 'HTTP/1.1 %s\r\nContent-Type: %s\r\nContent-Length: %s\r\nConnection: close\r\n\r\n' "$status" "$ctype" "$len"
+cat "$tmp"
+