Computer Science and Programming

2024-04-13 15:24:00 𝗦𝘁𝗮𝗰𝗸 𝗢𝘃𝗲𝗿𝗳𝗹𝗼𝘄 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 𝗜𝘀 𝗡𝗼𝘁 𝗪𝗵𝗮𝘁 𝗬𝗼𝘂 𝗠𝗲𝗮𝗻 𝗜𝘁 𝗜𝘀

In the recent interview with Scott Hanselman, 𝗥𝗼𝗯𝗲𝗿𝘁𝗮 𝗔𝗿𝗰𝗼𝘃𝗲𝗿𝗱𝗲, 𝗛𝗲𝗮𝗱 𝗢𝗳 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 𝗮𝘁 𝗦𝘁𝗮𝗰𝗸 𝗢𝘃𝗲𝗿𝗳𝗹𝗼𝘄, revealed the story about the architecture of Stack Overflow. They handle more than 6000 requests per second, 2 billion page views per month, and they manage to render a page in about 12 milliseconds. If we think about it a bit, we could imagine they use some kind of 𝗺𝗶𝗰𝗿𝗼𝘀𝗲𝗿𝘃𝗶𝗰𝗲 𝘀𝗼𝗹𝘂𝘁𝗶𝗼𝗻 𝘁𝗵𝗮𝘁 𝗿𝘂𝗻𝘀 𝗶𝗻 𝘁𝗵𝗲 𝗖𝗹𝗼𝘂𝗱 𝘄𝗶𝘁𝗵 𝗞𝘂𝗯𝗲𝗿𝗻𝗲𝘁𝗲𝘀.

But the story is a bit different. Their solution is 15 years old, and it is a 𝗯𝗶𝗴 𝗺𝗼𝗻𝗼𝗹𝗶𝘁𝗵𝗶𝗰 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝗿𝘂𝗻𝗻𝗶𝗻𝗴 𝗼𝗻-𝗽𝗿𝗲𝗺𝗶𝘀𝗲𝘀. It is actually 𝗮 𝘀𝗶𝗻𝗴𝗹𝗲 𝗮𝗽𝗽 on IIS, which runs 200 sites. This single app is running on nine web servers and a single SQL Server (with the addition of one hot standby).

They also use 𝘁𝘄𝗼 𝗹𝗲𝘃𝗲𝗹𝘀 𝗼𝗳 𝗰𝗮𝗰𝗵𝗲, one on SQL Server with large RAM (1.5TB), where they have 30% of DB access in RAM and also they use two Redis servers (master and replica). Besides this, they have 3 tag engine servers and 3 Elastic search servers, which are used for 34 million daily searches.

All this is handled by a 𝘁𝗲𝗮𝗺 𝗼𝗳 𝟱𝟬 𝗲𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝘀, who manage to 𝗱𝗲𝗽𝗹𝗼𝘆 𝘁𝗼 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗶𝗻 𝟰 𝗺𝗶𝗻𝘀 several times daily.

Their 𝗳𝘂𝗹𝗹 𝘁𝗲𝗰𝗵 𝘀𝘁𝗮𝗰𝗸 is:

C# + ASP. NET MVC
Dapper ORM
StaeckExchange Redis
MiniProfiler
Jil JSON Deseliazier
Exceptional logger for SQL
Sigil, a .Net CIL generation helper (for when C# isn’t fast enough)
NetGain, a high-performance web socket server
Opserver, monitoring dashboard polling most systems and feeding from Orion, Bosun, or WMI.
Bosun, backend monitoring system, written in Go Open / Comment

2024-04-09 17:29:35 𝗛𝗼𝘄 𝗧𝗼 𝗘𝗻𝗮𝗯𝗹𝗲 𝗖𝗼𝗻𝘁𝗶𝗻𝘂𝗼𝘂𝘀 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻 𝘄𝗶𝘁𝗵 𝗣𝘂𝗹𝗹 𝗥𝗲𝗾𝘂𝗲𝘀𝘁𝘀?

With Pull Requests, we lost the ability to have a proper Continuous Integration (CI) process in a way that delayed integration due to code reviews. So here comes a “Ship/Show/Ask” branching strategy. The thing is that not all pull requests need code reviews.

So, whenever we make a change, we have three options:

𝗦𝗵𝗶𝗽 - Small changes that don’t need people’s review can be pushed directly to the main branch. We have some build pipelines running on the main brunch, which run tests and other checks, so it is a safety net for our changes. Some examples are: fixing a typo, increasing the minor dependency version, updated documentation.

𝗦𝗵𝗼𝘄 - Here, we want to show what has been done. When you have a branch, you open a Pull Request and merge it without a review. Yet, you still want people to be notified of the change (to review it later), but don’t expect essential discussions. Some examples are: a local refactoring, fixing a bug, added a test case.

𝗔𝘀𝗸 - Here, we make our changes and open a Pull Request while waiting for feedback. We do this because we want a proper review in case we need clarification on our approach. This is a classical way of making Pull Requests. Some examples are: Adding a new feature, major refactoring, and proof of concept. Open / Comment

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2024-04-07 15:13:30 Encryption and Decryption using Linear Algebra with C++

This project implements a text encryption and decryption system using a matrix-based encryption technique. This project serves as an educational and practical exploration of matrix-based encryption techniques, demonstrating the fundamental concepts of encryption and decryption in a user-friendly manner.

https://github.com/farukalpay/TextEncryptionWithLinearAlgebra Open / Comment

2024-04-02 18:34:03 𝗛𝗼𝘄 𝘁𝗼 𝗱𝗼 𝗰𝗼𝗱𝗲 𝗿𝗲𝘃𝗶𝗲𝘄𝘀 𝗽𝗿𝗼𝗽𝗲𝗿𝗹𝘆

An essential step in the software development lifecycle is code review. It enables developers to enhance code quality significantly. It resembles the authoring of a book. The author writes the story, which is then edited to ensure no mistakes like mixing up "you're" with "yours." Code review in this context refers to examining and assessing other people's code.

There are different 𝗯𝗲𝗻𝗲𝗳𝗶𝘁𝘀 𝗼𝗳 𝗮 𝗰𝗼𝗱𝗲 𝗿𝗲𝘃𝗶𝗲𝘄: it ensures consistency in design and implementation, optimizes code for better performance, is an opportunity to learn, and knowledge sharing and mentoring, as well as promotes team cohesion.

What should you look for in a code review? Try to look for things such as:

𝗗𝗲𝘀𝗶𝗴𝗻 (does this integrate well with the rest of the system, and are interactions of different components make sense)
𝗗𝘂𝗻𝗰𝘁𝗶𝗼𝗻𝗮𝗹𝗶𝘁𝘆 (does this change is what the developer intended)
𝗗𝗼𝗺𝗽𝗹𝗲𝘅𝗶𝘁𝘆 (is this code more complex than it should be)
𝗡𝗮𝗺𝗶𝗻𝗴 (is naming good?)
𝗘𝗻𝗴. 𝗽𝗿𝗶𝗻𝗰𝗶𝗽𝗹𝗲𝘀 (solid, kiss, dry)
𝗧𝗲𝘀𝘁𝘀 (are different kinds of tests used appropriately, code coverage),
𝗦𝘁𝘆𝗹𝗲 (does it follow style guidelines),
𝗗𝗼𝗰𝘂𝗺𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻, etc. Open / Comment

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2024-03-27 20:21:55 𝗗𝗶𝗱 𝗜 𝗴𝗶𝘃𝗲 𝗺𝘆 𝗯𝗲𝘀𝘁 𝗹𝗮𝘀𝘁 𝘄𝗲𝗲𝗸?

There are no two same days nor two same weeks

The "best" can mean different on "different" days

This is why we need to have weekly and monthly goals

And the results are that matters, not the effort

I wish you a great week ahead Open / Comment

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2024-03-26 20:41:56 𝗛𝗼𝘄 𝘁𝗼 𝘂𝘀𝗲 𝘂𝗻𝗱𝗼𝗰𝘂𝗺𝗲𝗻𝘁𝗲𝗱 𝗪𝗲𝗯 𝗔𝗣𝗜𝘀?

There are several methods to tackle this issue, primarily involving intercepting traffic originating from a web API. If the goal is to intercept HTTP/HTTPS traffic from various sources, one approach involves manually constructing a custom sniffer. However, this method can be burdensome as it requires tailoring the solution for each API individually.

Now, Postman offers a solution to sniff traffic from any API with the HTTP/HTTP protocol. What is good about this feature is that traffic capture enables you to generate a Postman collection, which you can then use to test, evaluate, and document captured APIs.

Check more at the following link:

https://blog.postman.com/introducing-postman-new-improved-system-proxy/. Open / Comment

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