Nethogs-Monitor: Add Nethogs monitor service with installation scripts, dashboard, and reporting utilities

monitor-service/nethogs-monitor-report.sh

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+#!/bin/bash
+
+set -e
+
+# Configuration
+NETHOGS_LOG="/var/log/nethogs/nethogs.jsonl"
+TEMPLATE_FILE="/opt/nethogs-monitor/nethogs-monitor-dashboard-template.html"
+TEMP_DIR=$(mktemp -d)
+HOURS_BACK="${1:-24}"
+OUTPUT_FILE="${2:-${PWD}/nethogs-dashboard.html}"
+MAX_LINES=10000
+
+log() {
+    echo "[$(date +'%Y-%m-%d %H:%M:%S')] $1" >&2
+}
+
+cleanup() {
+    rm -rf "$TEMP_DIR"
+}
+
+trap cleanup EXIT
+
+# Function to extract recent data from JSONL
+extract_recent_data() {
+    local hours_back=$1
+    local output_file="$TEMP_DIR/recent_data.jsonl"
+
+    if [ ! -f "$NETHOGS_LOG" ]; then
+        log "Warning: File $NETHOGS_LOG not found"
+        echo "[]" > "$output_file"
+        return
+    fi
+
+    # Calculate timestamp limit
+    local time_limit=$(date -d "$hours_back hours ago" +%s)
+
+    # Extract last lines and filter by time
+    echo "[" > "$output_file"
+    tail -n $MAX_LINES "$NETHOGS_LOG" | while IFS= read -r line; do
+        if [ -n "$line" ]; then
+            # Extract timestamp and convert to epoch
+            local timestamp_iso=$(echo "$line" | jq -r '.timestamp // empty' 2>/dev/null || echo "")
+            if [ -n "$timestamp_iso" ]; then
+                local timestamp_epoch=$(date -d "$timestamp_iso" +%s 2>/dev/null || echo "0")
+                if [ "$timestamp_epoch" -ge "$time_limit" ]; then
+                    echo "${line},"
+                fi
+            fi
+        fi
+    done >> "$output_file"
+    echo "]" >> "$output_file"
+
+    # If no data, create valid empty file
+    if [ ! -s "$output_file" ]; then
+        echo "[]" > "$output_file"
+    fi
+}
+
+# Function to generate HTML with embedded data
+generate_html() {
+    local data_file="$1"
+    local output="$2"
+
+    # Verify template exists
+    if [ ! -f "$TEMPLATE_FILE" ]; then
+        log "Error: Template not found at $TEMPLATE_FILE"
+        exit 1
+    fi
+
+    # Generate generation timestamp
+    local generation_time=$(date -Iseconds)
+
+    # Copy template and replace placeholders
+    cp "$TEMPLATE_FILE" "$output"
+
+    #sed -i "s|JSON_DATA_PLACEHOLDER|$json_data|g" "$output"
+    sed -i "/JSON_DATA_PLACEHOLDER/{
+        r $data_file
+        d
+    }" "$output"
+    sed -i "s|GENERATION_TIME_PLACEHOLDER|$generation_time|g" "$output"
+    sed -i "s|HOURS_BACK_PLACEHOLDER|$HOURS_BACK|g" "$output"
+
+    log "Dashboard HTML generated: $output"
+}
+
+# Main function
+main() {
+    log "Starting dashboard generation"
+    log "Extracting data from last $HOURS_BACK hours..."
+
+    # Check dependencies
+    if ! command -v jq &> /dev/null; then
+        log "Error: jq is not installed. Install with: sudo apt install jq"
+        exit 1
+    fi
+
+    # Extract recent data
+    extract_recent_data "$HOURS_BACK"
+
+    # Verify data exists
+    local data_file="$TEMP_DIR/recent_data.jsonl"
+    local record_count=$(wc -l < "$data_file")
+    log "Processing $record_count records"
+
+    # Generate HTML
+    log "Generating dashboard HTML..."
+    generate_html "$data_file" "$OUTPUT_FILE"
+
+    # Create output directory if it doesn't exist
+    mkdir -p "$(dirname "$OUTPUT_FILE")"
+
+    log "Dashboard generated successfully: $OUTPUT_FILE"
+    log "File size: $(du -h "$OUTPUT_FILE" | cut -f1)"
+
+    xdg-open "$OUTPUT_FILE"
+}
+
+# Show help
+if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
+    echo "Usage: $0 [HOURS] [OUTPUT_FILE]"
+    echo
+    echo "HOURS: Number of hours to look back for data (default: 24)"
+    echo "OUTPUT_FILE: Output HTML file (default: ${PWD}/nethogs-dashboard.html)"
+    echo
+    echo "Examples:"
+    echo "  $0                           # Last 24 hours, default output"
+    echo "  $0 6                         # Last 6 hours"
+    echo "  $0 168 /var/www/html/week.html  # Last week"
+    echo
+    echo "Dependencies: jq"
+    exit 0
+fi
+
+# Execute main function
+main "$@"