GolamV2 - A LightWeight Web Crawler for Emails/Keywords/Dead Backlinks/Dead Domains

GolamV2 is a low-memory web crawler designed for maximum throughput in resource-constrained environments. It supports multiple hunting modes including email extraction, keyword searching, and dead link detection. It is a rewrite of the Python Version Gollum Spyder here. Includes a Custom Interactive CLI Explore for its BadgerDB database

Features

• Multi-Purpose Crawling: Email hunting, keyword searching, dead link detection
• Memory Efficiency: Can run with decent through put on low resource environments
• Robots.txt Compliant: Respects robots.txt and crawl delays
• Real-time Dashboard: Web-based monitoring interface
• Interactive CLI Explorer: Comprehensive data exploration and analysis tool
• Clean Architecture: Modular, maintainable codebase
• Efficient Storage: BadgerDB for persistent storage
• Bloom Filter: Memory-efficient duplicate URL detection
• Priority Queue: Smart URL queuing with database fallback

Architecture

Core Components

1. URL Queue: Priority-based queue (100k URLs limit) with automatic database refilling and spilling
2. Bloom Filter: To dedupe
3. Storage Layer: BadgerDB for persistent URL and result storage
4. Worker Pool: Configurable concurrent workers
5. Content Extractor:
6. Robots Checker: Compliant robots.txt parsing and enforcement. Also parses sitemaps
7. Dashboard: Real-time web interface for monitoring

Installation

# Clone the repository
git clone https://github.com/nobrainghost/golamv2
cd GolamV2

# Install dependencies
go mod tidy

# Build the application
go build -o golamv2 main.go

Usage

Basic Email Hunting

./golamv2 --email --url https://example.com --workers 25

Keyword Searching

./golamv2 --keywords "password,login,admin" --url https://example.com --workers 30

Dead Link Detection

./golamv2 --domains --url https://example.com --workers 20

All-in-One Mode

./golamv2 --email --domains --keywords "smeagol,ring" --url https://example.com --workers 40

Data Exploration

# Explore crawl data interactively
./golamv2 explore

# Explore with custom data directory
./golamv2 explore --data /path/to/data

Advanced Options

./golamv2 \
  --email \
  --url https://example.com \
  --workers 50 \
  --memory 400 \
  --depth 5 \
  --dashboard 8080

Command Line Options

Flag	Description	Default
--email	Hunt for email addresses	false
--domains	Hunt for dead URLs and domains	false
--keywords	Hunt for specific keywords (comma-separated)	[]
--url	Starting URL to crawl (required)	-
--workers	Maximum number of concurrent workers	50
--memory	Maximum memory usage in MB	500
--depth	Maximum crawling depth	5
--dashboard	Dashboard port	8080

Dashboard

Access the real-time dashboard at http://localhost:8080 (or your specified port). The paths /db currently dont work

Dashboard Features

• Real-time Metrics: Live updates via a WebSocket
• Performance Monitoring: URLs/second, memory usage, uptime
• Queue Status: URLs in queue, database, active workers
• Findings Summary: Emails, keywords, dead links found
• Success Rate: Error tracking and success percentage

CLI Data Explorer

GolamV2 includes an interactive CLI tool for exploring and analyzing crawl data stored in its BadgerDB databases.

Starting the Explorer

# Use default data directory (golamv2_data)
./golamv2 explore

# Specify custom data directory
./golamv2 explore --data /path/to/data

# With output file for exports
./golamv2 explore --output results.json

Available Commands

Command	Description	Example
help	Show all available commands	help
stats	Display database statistics	stats
urls [limit]	List URLs (default: 10)	urls 20
results [limit]	List crawl results (default: 10)	results 50
search <term>	Search in results content	search "admin panel"
emails [limit]	Show found emails	emails 25
keywords [limit]	Show found keywords	keywords 15
deadlinks [limit]	Show dead links found	deadlinks 30
export <type>	Export data to JSON	export emails
raw <key>	Show raw data for specific key	raw url:example.com
analyze	Detailed data analysis	analyze
timeline	Show crawling timeline	timeline
domains	Show domain statistics	domains
clear	Clear terminal screen	clear
quit/exit	Exit explorer	quit

Explorer Features

Data Search and Filtering

• Full-text search across all results
• Search in titles, content, emails, and keywords
• Filter by status, domain, or content type

Export Capabilities

• Export URLs, results, emails, or keywords to JSON
• Configurable output files
• Data formatting for further analysis ##NOTE : NOT FULLY TESTED

Advanced Analysis

• Domain-based statistics and analysis
• Timeline visualization of crawling activity
• Success rate analysis by domain
• Error categorization and reporting
• Performance metrics and trends

Example Explorer Session

$ ./golamv2 explore
🕸️  GolamV2 Data Explorer
========================
Interactive tool to explore crawl data
Data path: golamv2_data

golamv2> stats
 Database Statistics
=====================
URLs in database:      2,767
Results in database:   37,635
Emails found:          118,613
Keywords found:        1,258
Dead links found:      20,422
Errors encountered:    226
Success rate:          99.4%

golamv2> search "login"
 Search Results for "login":
=============================
Found 45 results containing "login"
- example.com/admin - Admin Login Portal
- test.org/user - User Login Page
...

golamv2> export emails
 Exporting emails...
Exported 118,613 emails to emails_export.json

golamv2> quit
Goodbye! [waveEmoji]

Command Line Options

Flag	Short	Description	Default
--data	-d	Path to GolamV2 data directory	golamv2_data
--output	-o	Output file for exports	(none)

Database Storage

URL Database (urls/)

• Stores pending URLs for crawling
• Automatic queue refilling when memory queue is <40% full
• Optimized for fast retrieval and batch operations

Results Database (finds_*)

• Stores crawling results based on mode:
  • finds_email: Email hunting results
  • finds_keywords: Keyword search results
  • finds_domains: Dead link detection results
  • finds: All-mode results

Performance Optimization

Memory Management

• Bloom Filter: 10M URL capacity, 1% false positive rate
• Priority Queue: 100k URL limit with smart refilling
• BadgerDB: Tuned for low memory - can increase to suit your environment
• HTTP Responses: 10MB size limit to prevent memory exhaustion

Throughput Optimization

• Worker Pool: Configurable concurrent processing
• Rate Limiting: Respectful crawling (10 req/sec default)
• Batch Operations: Efficient database operations
• Connection Pooling: Reused HTTP connections

Robots.txt Compliance

• Automatic Parsing: Fetches and caches robots.txt
• Crawl Delays: Respects specified delays
• Sitemap Discovery: Extracts sitemap URLs for better crawling
• User-Agent Specific: Follows rules for GolamV2-Crawler/1.0

Configuration

Environment Variables

export GOLAMV2_DB_PATH="./golamv2_data"
export GOLAMV2_USER_AGENT="GolamV2-Crawler/1.0"
export GOLAMV2_RATE_LIMIT="10"

Memory Allocation

• 70%: URL storage and processing
• 30%: Results storage and caching

Troubleshooting

Common Issues

1. Memory Usage Too High

   • Reduce --workers count
   • Lower --memory limit
   • Reduce crawling --depth

2. Slow Performance

   • Increase --workers count
   • Check network connectivity
   • Monitor robots.txt delays

3. Database Issues

   • Ensure sufficient disk space
   • Check file permissions
   • Restart application for corruption

Performance Tuning

1. For High-Memory Systems

   ./golamv2 --workers 100 --memory 800 --url https://example.com

2. For Low-Memory Systems

   ./golamv2 --workers 20 --memory 200 --url https://example.com

3. For Maximum Throughput

   ./golamv2 --workers 200 --memory 400 --depth 3 --url https://example.com

License

MIT License - see LICENSE file for details.

Support

For issues, questions, or contributions, please use the GitHub issue tracker or mailto:golam@benar.me