From e1f89b29b322b52a205d241fbf9ca2acf2a7b4c3 Mon Sep 17 00:00:00 2001
From: Ssyleric <47066760+Ssyleric@users.noreply.github.com>
Date: Mon, 3 Nov 2025 16:39:05 +0100
Subject: [PATCH] Create swap_cleaner.sh

---
 swap_cleaner.sh | 86 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 swap_cleaner.sh

diff --git a/swap_cleaner.sh b/swap_cleaner.sh
new file mode 100644
index 0000000..c311198
--- /dev/null
+++ b/swap_cleaner.sh
@@ -0,0 +1,86 @@
+#!/bin/bash
+# swap_cleaner.sh — purge le swap si > 90% pendant 2h et envoie une notif Discord
+# Exécuter en root (PVE), sans sudo.
+
+set -euo pipefail
+
+# --- Config -------------------------------------------------------------------
+WEBHOOK="https://discord.com/api/webhooks/1237668309856686090/xqN9G2ZtCkNKuiivng2kEMXLUY7Zx3_RK2w1Y4TCgVgPcc4M5ZYN7QStwHzyp7dEIqrb"
+THRESHOLD=${THRESHOLD:-90}        # % de swap utilisé (override possible via env)
+CHECK_EVERY_MIN=${CHECK_EVERY_MIN:-10}  # fréquence du cron en minutes
+DURATION_MIN=${DURATION_MIN:-120}       # durée continue requise au-dessus du seuil
+STATE_FILE="/var/tmp/swap_usage_count.txt"
+LOG="/var/log/swap_cleaner.log"
+HOST="$(hostname)"
+
+# --- Pré-requis ---------------------------------------------------------------
+if ! command -v jq >/dev/null 2>&1; then
+  apt update -y && apt install -y jq
+fi
+
+mkdir -p "$(dirname "$STATE_FILE")"
+touch "$STATE_FILE" "$LOG"
+
+# --- Fonctions ----------------------------------------------------------------
+limit_checks() {
+  python3 - "$CHECK_EVERY_MIN" "$DURATION_MIN" <<'PY'
+import sys, math
+every = int(sys.argv[1]); duration = int(sys.argv[2])
+print(max(1, math.ceil(duration / every)))
+PY
+}
+
+discord_notify() {
+  # $1 = message (multi-ligne), $2 = fichier joint (optionnel)
+  local msg="$1" file="${2:-}"
+  # marge stricte < 2000 caractères
+  if [ "${#msg}" -gt 1900 ]; then msg="${msg:0:1900}\n…(truncated)"; fi
+  printf "%s" "$msg" | jq -Rs '{content: .}' > /tmp/payload.json
+  if [ -n "${file}" ] && [ -f "${file}" ]; then
+    curl -sS -f \
+      -F "payload_json=@/tmp/payload.json;type=application/json" \
+      -F "file=@${file};type=text/plain" \
+      "$WEBHOOK" >/dev/null || true
+  else
+    curl -sS -f -H "Content-Type: application/json" \
+      -d @/tmp/payload.json "$WEBHOOK" >/dev/null || true
+  fi
+  rm -f /tmp/payload.json
+}
+
+swap_usage_percent() {
+  local total used
+  read -r total used _ < <(free -m | awk '/^Swap:/ {print $2, $3, $4}')
+  if [ "${total:-0}" -gt 0 ]; then echo $(( used * 100 / total )); else echo 0; fi
+}
+
+log() { echo "$(date '+%F %T') $*" | tee -a "$LOG" >/dev/null; }
+
+# --- Single instance (évite chevauchements) -----------------------------------
+exec 9>/var/tmp/.swap_cleaner.lock
+flock -n 9 || exit 0
+
+# --- Logic --------------------------------------------------------------------
+COUNT="$(cat "$STATE_FILE" 2>/dev/null || echo 0)"
+USAGE="$(swap_usage_percent)"
+LIMIT="$(limit_checks)"
+
+if [ "$USAGE" -ge "$THRESHOLD" ]; then
+  COUNT=$((COUNT + 1)); echo "$COUNT" > "$STATE_FILE"
+  log "[INFO] Swap ${USAGE}% (>=${THRESHOLD}%). Compteur ${COUNT}/${LIMIT}."
+  if [ "$COUNT" -ge "$LIMIT" ]; then
+    log "[ACTION] ${DURATION_MIN} min >= ${THRESHOLD}% — swapoff -a && swapon -a"
+    BEFORE="$(free -h)"
+    if swapoff -a && swapon -a; then
+      AFTER="$(free -h)"; echo "0" > "$STATE_FILE"
+      MSG="🧹 **Swap cleaner (PVE: ${HOST})**\nSeuil: ${THRESHOLD}% maintenu ${DURATION_MIN} min.\nAction: \`swapoff -a && swapon -a\`\n\nAvant:\n${BEFORE}\n\nAprès:\n${AFTER}\n\nLog: ${LOG}"
+      discord_notify "$MSG" "$LOG"
+    else
+      log "[ERROR] Échec swapoff/swapon."
+      discord_notify "⚠️ **Swap cleaner (PVE: ${HOST})**\nÉchec de \`swapoff -a && swapon -a\` (swap=${USAGE}%)." "$LOG"
+    fi
+  fi
+else
+  if [ "$COUNT" -ne 0 ]; then log "[INFO] Swap à ${USAGE}%, reset compteur."; fi
+  echo "0" > "$STATE_FILE"
+fi