Original Post: Promise queues and batching concurrent tasks in Deno
The article discusses Deno, a secure runtime for JavaScript and TypeScript, created by Ryan Dahl to address the limitations of Node.js. Deno offers enhanced security, simplified module management, and native TypeScript support. Key highlights include:
Introduction to Deno
- Secure Runtime: Uses the V8 JavaScript engine, similar to Node.js but with improvements.
- Module Management: Fetches and caches modules directly from URLs.
- TypeScript: Supported out-of-the-box.
Handling Concurrent Tasks
- Promises and
Promise.all: Simplifies handling multiple asynchronous tasks concurrently. - Drawbacks: Use of
Promise.allcan result in high memory usage if any promise fails.
Efficient Concurrency Techniques
- Promise Queues: Sequential management of promises to enhance application performance.
- Concurrency in JavaScript: The ability to execute multiple tasks without blocking others.
Code Examples
- Basic Deno Server: Example code for a simple HTTP server in Deno.
- Promise.allSettled: Example of sending multiple HTTP requests and handling outcomes concurrently.
Advanced Concurrency Management
- BatchQueue Module: Manages task execution with controlled concurrency to prevent overloading.
- ProgressBar Integration: Provides visual feedback for long-running tasks.
Security in Deno
- SSRF Vulnerability: Explanation of Server-Side Request Forgery and its risks.
- Mitigation Techniques: Least privilege principle, input validation, and code example for secure HTTP handling.
Real-World Scenario
- Deno Application: Creating a Deno application that sends multiple HTTP requests while efficiently managing concurrency using
BatchQueueandProgressBar.
Conclusion
Proper handling of concurrent tasks and understanding security threats, such as SSRF, are crucial for building high-performance and secure Deno applications. The article encourages exploring Deno further and leveraging its modules and security features.
For more details and the full example code, refer to the linked GitHub repository.
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