🚀 Concurrent Web Crawler

Overview

The Concurrent Web Crawler is a Go-based application that efficiently crawls web pages. By leveraging Go's concurrency features, this tool provides fast and effective web scraping. Whether you want to gather data or analyze web content, this crawler is designed for performance and reliability.

Features

• Concurrency: Utilize Go's goroutines for fast processing.
• Rate Limiting: Control the number of requests sent to avoid overwhelming servers.
• Error Handling: Robust mechanisms to manage failures during crawling.
• HTML Parsing: Extract meaningful data from web pages.
• Channel-Based Communication: Efficient data flow and management.

Getting Started

Prerequisites

Before you start, ensure you have Go installed on your system. You can download it from the official Go website.

Installation

1. Clone the repository:

   git clone https://github.com/LOKESH-loky/Concurrent-Web-Crawler.git
   cd Concurrent-Web-Crawler

2. Build the application:

   go build -o webcrawler

3. Run the application:

   ./webcrawler

Configuration

The application supports various configuration options. You can adjust the following parameters in the config.yaml file:

• maxDepth: Set the maximum depth for crawling.
• maxUrls: Limit the number of URLs to visit.
• rateLimit: Control the number of requests per second.

Example configuration:

maxDepth: 3
maxUrls: 100
rateLimit: 10

Running the Crawler

To start crawling, run the command:

./webcrawler -url <start_url>

Replace <start_url> with the target URL you want to crawl.

Output

The crawler outputs the results in a structured format. You can specify the output format using command-line flags:

• -json: Outputs in JSON format.
• -csv: Outputs in CSV format.

Example

./webcrawler -url https://example.com -json

Advanced Usage

Concurrency Control

The crawler allows you to control the number of concurrent requests. This is managed through the concurrency parameter in the command line:

./webcrawler -url https://example.com -concurrency 5

Adjust this number based on the target server's capabilities and your needs.

Custom User Agent

To avoid blocking, set a custom User-Agent in the config.yaml:

userAgent: "MyCustomCrawler/1.0"

Error Handling

The crawler includes built-in error handling. It will log errors and continue processing remaining URLs. You can find logs in the logs directory.

Testing

To run tests, use the following command:

go test ./...

Make sure to review and run tests before deploying.

Contributing

Contributions are welcome! Here’s how you can help:

1. Fork the repository.
2. Create a new branch:

   git checkout -b feature/YourFeature

3. Make your changes.
4. Commit your changes:

   git commit -m "Add new feature"

5. Push to the branch:

   git push origin feature/YourFeature

6. Create a pull request.

Please ensure your code follows the existing style and includes tests where appropriate.

License

This project is licensed under the MIT License. See the LICENSE file for details.

Releases

For the latest versions and updates, please visit the Releases section.

Acknowledgments

• Thanks to the Go community for their contributions.
• Inspired by various open-source web crawling projects.

Contact

For questions or suggestions, open an issue on GitHub or contact me directly through my profile.

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This README provides a complete overview of the Concurrent Web Crawler. Feel free to explore, contribute, and use this powerful tool for your web crawling needs!