News from Habr

Finding Typos in the GTK 4 Project by PVS-Studio

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Andrey2008 @ Habr 2 place · 02/03/2021 02:54 EDT

You may have already read a recent article about the first PVS-Studio run and filtration of warnings. We used the GTK 4 project as an example. It's about time we worked with the received report in more detail. Our regular readers may have already guessed that this article will be a description of errors found in the code. Read more → Read more ›

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Finding Typos in the GTK 4 Project by PVS-Studio

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Andrey2008 @ Habr 3 place · 02/03/2021 02:53 EDT

You may have already read a recent article about the first PVS-Studio run and filtration of warnings. We used the GTK 4 project as an example. It's about time we worked with the received report in more detail. Our regular readers may have already guessed that this article will be a description of errors found in the code. Read more → Read more ›

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C# Programmer, It's Time to Test Yourself and Find Error

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ValeryKomarov @ Habr 1 place · 02/01/2021 07:20 EDT

The PVS-Studio analyzer is regularly updated with new diagnostic rules. Curiously enough, diagnostics often detect suspicious code fragments before the end of the work. For example, such a situation may happen while testing on open-source projects. So, let's take a look at one of these interesting finding. Read more Read more ›

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[Translation] How I create browser applications inside browsers

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kornerr @ Habr 2 place · 02/01/2021 06:04 EDT

In 2013 Canonical tried to crowdfund Ubuntu Edge smartphone. Its main feature could be the ability to use the smartphone as a full-fledged PС. Unfortunatly, the crowdfunding campaign did not accumulate enough money, so a dream of having a universal device remained to be the dream.I've been searching for universality, too, on the software side, not the hardware one. Today I can confidently say I found the necessary combination: Git... Read more ›

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Coins classifier Neural Network: Head or Tail?

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FizpokPak @ Habr 3 place · 02/01/2021 05:51 EDT

Home of this article: https://robotics.snowcron.com/coins/02_head_or_tail.htmThe global objective of these articles is to build a coin classifier, capable of scanning your pocket change and find rare / valuable coins. This is a second article in a series, so let me remind you what happened earlier (https://habr.com/ru/post/538958/). During previous step we got a rather large dataset composed of pairs of images, loaded from an online coins site meshok.ru. Those images were uploaded... Read more ›

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[Translation] Implementing Offline traceroute Tool Using Python

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Debug_all @ Habr 1 place · 01/27/2021 10:48 EDT

Hey everyone! This post was born from a question asked by an IT forum member. The summary of the question looked as follows: There is a set of text files containing routing tables collected from various network devices. Each file represents one device. Device platforms and routing table formats may vary. It is required to analyze a routing path from any device to an arbitrary subnet or host on-demand. Resulting... Read more ›

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The founder’s guide to AngelList

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dmitrykabanov @ Habr 2 place · 01/26/2021 13:28 EDT

AngelList is a social network designed to connect startups with investors and vice versa. The founders of it were dissatisfied with how opaque the VC world was, and built a transparent online funding network to increase the amount of available data. This drastically improves the price-setting process, and allows startups to find the best investors for their business. The project began in partnership with just 50 volunteer investors wishing to... Read more ›

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Prometheus in Action: from default counters to SLO-related queries

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aydu @ Habr 2 place · 01/26/2021 05:13 EDT

All Prometheus metrics are based on time series - streams of timestamped values belonging to the same metric. Each time series is uniquely identified by its metric name and optional key-value pairs called labels. The metric name specifies some characteristics of the measured system, such as http_requests_total - the total number of received HTTP requests. In practice, you often will be interested in some subset of the values of a... Read more ›

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Monitoring your application with distributed tracing so you actually know what it's doing

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aydu @ Habr 1 place · 01/25/2021 03:45 EDT

What is distributed tracing? Distributed tracing is a method used to profile and monitor applications, especially those built using a microservices architecture. Distributed tracing helps pinpoint where failures occur and what causes poor performance.Let’s have a look at a simple prototype. A user fetches information about a shipment from `logistic` service. logistic service does some computation and fetches the data from a database. logistic service doesn’t know the actual status... Read more ›

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[Translation] NTFS Reparse Points

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Dabudabot @ Habr 1 place · 01/25/2021 02:40 EDT

Hi, Habr. Here I have prepared for you a small guide about NTFS Reparse points (hereinafter RP), reparse points. This article is for those who are just starting to into the Windows kernel drivers development. In the beginning, I will explain the theory with examples, then I will give an interesting task to solve.Read more → Read more ›

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Algorithms in Go: Merge Intervals

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aydu @ Habr 3 place · 01/25/2021 02:32 EDT

This is the third part of a series covering the implementation of algorithms in Go. In this article, we discuss the Merge Interval algorithm. Usually, when you start learning algorithms you have to deal with some problems like finding the least common denominator or finding the next Fibonacci number. While these are indeed important problems, it is not something that we solve every day. What I like about the Merge... Read more ›

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Revealed: 7 Top Web Development Companies & Trends for 2021

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varunbhagat1 @ Habr 2 place · 01/24/2021 23:16 EDT

As we enter a new decade, the IT industry has also encountered many loopholes that we must work on. Seeing this, hundreds of motivated young minds have decided to become entrepreneurs. But is it so easy to succeed in a world where competition is already so high? Bluntly, the answer is NO. It is not easy to be successful, and the reason for these startups' failure is the lack of... Read more ›

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[Translation] Architectural approaches to authorization in server applications: Activity-Based Access Control Framework

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gbondarchuk2019 @ Habr · 01/24/2021 18:13 EDT

This article is about security. I’ll focus on this in the context of web applications, but I’ll also touch on other types of applications. Before I describe approaches and frameworks, I want to tell you a story.BackgroundThroughout my years working in the IT sphere, I’ve had the opportunity to work on projects in a variety of fields. Even though the process of authenticating requirements remained relatively consistent, methods of implementing... Read more ›

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Coins Classification using Neural Networks

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FizpokPak @ Habr · 01/24/2021 13:59 EDT

See more at robotics.snowcron.com This is the first article in a serie dedicated to coins classification.Having countless "dogs vs cats" or "find a pedestrian on the street" classifiers all over the Internet, coins classification doesn't look like a difficult task. At first. Unfortunately, it is degree of magnitude harder - a formidable challenge indeed. You can easily tell heads of tails? Great. Can you figure out if the number is... Read more ›

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How PVS-Studio Checked ELKI in January

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ipolynkina @ Habr 1 place · 01/22/2021 04:17 EDT

If you feel like the New Year just came, and you missed the first half of January, then all this time you've been busy looking for tricky bugs in the code you maintain. It also means that our article is what you need. PVS-Studio has checked the ELKI open source project to show you errors that may occur in the code, how cunningly they can hide there, and how you... Read more ›

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Опционы: расчет одношаговой биномиальной модели. Ликбез для гика, ч. 8

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MihailAndreev @ Habr 2 place · 01/21/2021 08:03 EDT

Это третья часть рассказа про опционы, где мы поговорим про биномиальную модель, риск-нейтральную меру и разберёмся, как рассчитать цену опциона. Читать далее Read more ›

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пост для мотивации: как я инвестирую в акции

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Artem_zin @ Habr 3 place · 01/21/2021 06:53 EDT

дисклеймерэтот документ не является финансовым советом, прост личные мысли по поводу инвестиций, компаний почему я инвестирую в компании, а не крипту/недвиж/крышечки от пива (крипта, недвиж и крышечки у меня, конечно, есть): цель коммерческих компаний — зарабатывать деньги, цель валюты/крышечек — быть средством обмена, а недвиж/etc — заморозить $ где-то вокруг инфляции, ну или как-то так, я инженер, а не экономист, сильно не бейте ¯*(ツ)*/¯ мои принципы инвестирования оч простые: Read... Read more ›

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CRISPR для чайников, или Краткая справка по быстрому редактированию ДНК

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SvetBolgova @ Habr 3 place · 01/21/2021 03:25 EDT

Возможность изменять фрагменты ДНК всегда была святым Граалем биотехнологии и медицины. CRISPR позволяет делать это с невиданной ранее скоростью и эффективностью. Считайте, что биологи раньше работали на пишущей машинке, а благодаря CRISPR в одночасье пересели на MacBook. Не зря открытие этого метода в 2020 году удостоилось Нобелевской премии по химии.Под катом — рассказ о появлении CRISPR, принципах работы и применении в настоящем и будущем. Да, вы все верно поняли, это... Read more ›

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Вам показалось! Все о Perceived Performance

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glebmachine @ Habr · 01/21/2021 01:14 EDT

Перед вами быстрый, удобный и отзывчивый сайт? Возможно, это не результат плодотворной работы множества людей, а всего лишь набор психологических и инженерных трюков, направленных на улучшение Perceived Performance.В большинстве случаев с ростом реальной производительности улучшается и Perceived Performance. А когда реальная производительность не может быть с легкостью увеличена, существует возможность поднять видимую. В своем докладе на Frontend Live 2020 бывший разработчик Avito Frontend Architecture Алек Read more ›

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Espressif IoT Development Framework: 71 Shots in the Foot

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Andrey2008 @ Habr · 01/20/2021 07:49 EDT

One of our readers recommended paying heed to the Espressif IoT Development Framework. He found an error in the project code and asked if the PVS-Studio static analyzer could find it. The analyzer can't detect this specific error so far, but it managed to spot many others. Based on this story and the errors found, we decided to write a classic article about checking an open source project. Enjoy exploring... Read more ›

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