update for dragonx binary changes, added monitor script

monitor_lwd.sh

@@ -0,0 +1,123 @@
+#!/usr/bin/env bash
+# Copyright 2024-2026 The DragonX Developers
+# Released under GPLv3
+#
+# Monitors lightwalletd and restarts it automatically if it crashes.
+# Usage: ./monitor_lwd.sh &
+#   or:  nohup ./monitor_lwd.sh >> /tmp/lwd-monitor.log 2>&1 &
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+LWD_BIN="$SCRIPT_DIR/lightwalletd"
+LWD_ARGS="-bind-addr lite.dragonx.is:9069 -conf-file $HOME/.hush/DRAGONX/DRAGONX.conf -no-tls"
+LOGFILE="$SCRIPT_DIR/lwd-monitor.log"
+PIDFILE="/tmp/lwd-monitor.pid"
+RESTART_DELAY=5        # seconds to wait before restarting after a crash
+MAX_RAPID_RESTARTS=5   # max restarts within the rapid window before backing off
+RAPID_WINDOW=120       # seconds — if this many restarts happen within this window, back off
+BACKOFF_DELAY=60       # seconds to wait when backing off
+
+# Colors
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+log() {
+    echo -e "[$(date '+%Y-%m-%d %H:%M:%S')] $1" | tee -a "$LOGFILE"
+}
+
+cleanup() {
+    log "${YELLOW}Monitor shutting down...${NC}"
+    if [[ -n "${LWD_PID:-}" ]] && kill -0 "$LWD_PID" 2>/dev/null; then
+        log "Stopping lightwalletd (PID $LWD_PID)..."
+        kill "$LWD_PID" 2>/dev/null || true
+        wait "$LWD_PID" 2>/dev/null || true
+    fi
+    rm -f "$PIDFILE"
+    log "Monitor stopped."
+    exit 0
+}
+
+trap cleanup SIGINT SIGTERM
+
+# Prevent duplicate monitors
+if [[ -f "$PIDFILE" ]]; then
+    OLD_PID=$(cat "$PIDFILE")
+    if kill -0 "$OLD_PID" 2>/dev/null; then
+        echo "Monitor already running (PID $OLD_PID). Exiting."
+        exit 1
+    fi
+    rm -f "$PIDFILE"
+fi
+echo $$ > "$PIDFILE"
+
+# Check binary exists
+if [[ ! -x "$LWD_BIN" ]]; then
+    log "${RED}ERROR: lightwalletd binary not found at $LWD_BIN${NC}"
+    log "Build it first with: make build"
+    rm -f "$PIDFILE"
+    exit 1
+fi
+
+# Check conf file exists
+CONF_FILE="$HOME/.hush/DRAGONX/DRAGONX.conf"
+if [[ ! -f "$CONF_FILE" ]]; then
+    log "${RED}ERROR: DRAGONX.conf not found at $CONF_FILE${NC}"
+    rm -f "$PIDFILE"
+    exit 1
+fi
+
+log "${GREEN}DragonX lightwalletd monitor started (PID $$)${NC}"
+log "Binary:  $LWD_BIN"
+log "Args:    $LWD_ARGS"
+
+restart_times=()
+LWD_PID=""
+
+while true; do
+    # Start lightwalletd
+    log "${GREEN}Starting lightwalletd...${NC}"
+    $LWD_BIN $LWD_ARGS >> "$LOGFILE" 2>&1 &
+    LWD_PID=$!
+    log "lightwalletd started with PID $LWD_PID"
+
+    # Wait for it to exit
+    wait "$LWD_PID" || true
+    EXIT_CODE=$?
+    LWD_PID=""
+
+    if [[ $EXIT_CODE -eq 0 ]]; then
+        log "${YELLOW}lightwalletd exited cleanly (code 0). Not restarting.${NC}"
+        break
+    fi
+
+    log "${RED}lightwalletd crashed with exit code $EXIT_CODE${NC}"
+
+    # Track restart frequency for backoff
+    NOW=$(date +%s)
+    restart_times+=("$NOW")
+
+    # Trim old entries outside the rapid window
+    CUTOFF=$((NOW - RAPID_WINDOW))
+    filtered=()
+    for t in "${restart_times[@]}"; do
+        if (( t >= CUTOFF )); then
+            filtered+=("$t")
+        fi
+    done
+    restart_times=("${filtered[@]}")
+
+    if (( ${#restart_times[@]} >= MAX_RAPID_RESTARTS )); then
+        log "${YELLOW}Too many restarts (${#restart_times[@]} in ${RAPID_WINDOW}s). Backing off for ${BACKOFF_DELAY}s...${NC}"
+        sleep "$BACKOFF_DELAY"
+        restart_times=()
+    else
+        log "Restarting in ${RESTART_DELAY}s..."
+        sleep "$RESTART_DELAY"
+    fi
+done
+
+rm -f "$PIDFILE"
+log "Monitor exiting."