Tag golang

The context package in Go is quite simple and well-known. On the other hand, there are some misunderstandings while using it. Today, I’ll try to explain all the most popular concerns and make more clear when and how use the Context. Let’s start with what the context is. Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. ref: https://golang.

Go has plenty of different web frameworks. When you are faced with choosing a framework for the first time, it may turn out to be quite a challenge to choose the best one. This article is intended to help you choose the best one. It is full of personal judgments that you may disagree with. However, I believe you will find it most helpful. Martini The first framework is Martini. Honestly, it shouldn’t be here as it’s been under development since 2017.

In Go, we can refer to variables using value or pointers. Sometimes, it’s hard to answer which approach is more suitable. At the first place, you should learn about general rules. Value semantic should be used every time when copying the value make sense in the logic of your code. For example, every value object should be passed by value. If you have a struct Money then it’s possible (and also make sense) to have, at the same time, multiple 10$ in your code.

Slice is the most important data structure in Go. When it comes to performance, slices are going to beat any other data structure. They are simple but powerful. However, there are some gotchas you have to keep in mind. Today, I’ll explain how slices work to help you prevent some hard to find bugs and write better code. In Go, arrays have a fixed size. The length is part of the array’s type.

In the garbage-collected world, we want to keep the GC overhead as little as possible. One of the things we can do is limiting the number of allocations in our application. How to achieve that? There’s sync.Pool which caches allocated but unused items for later reuse. The Pool can become very useful when you have multiple parallel operations that can share the same piece of memory between them. The real power of it is visible when you have frequent allocations and deallocations of the same data structure.

OAuth 2.0 is the industry-standard protocol for authorization. Go has built-in support for this protocol and today we’ll build a simple application. The application will use the Facebook API to authorize a user. If you need to clarify what oauth2 is and how it works you can take a look at the introduction from DigitalOcean. There are some videos as well. The very first step of building our program is creating a new Facebook application.

The varnish is a well-known HTTP accelerator. As the continuation of the GoInPractice series, today I’ll show how you can build a simple (and naive) varnish implementation in Go. Some of the code is reused from Writing a reverse proxy so if you don’t understand something, I recommend taking a look at the blog post. We’ll split our project into a few parts. The first one will be the caching mechanism.

You can find a lot of materials about Go (including this blog) but it’s hard to find the best place to start. This article’s goal is to sum up the most valuable materials I found to help others. I focus only on free materials. Fundamentals The Go tour - IMO the absolutely must do. You can try Go without installing it. You’ll learn some basic syntax and concepts step by step, Go by example - if you’re confused how to use a certain part of the language it’s possible you’ll find an example of it on this page.

Some time ago, I found a video called Building a DIY proxy with the net package. I recommend watching it. Filippo Valsorda builds a simple proxy using low-level packages. It’s fun to watch it but I think it’s a bit complicated. In Go, it has to be an easier way so I decided to continue writing series Go In Practice by writing a simple but yet powerful reverse proxy as fast as it’s possible.

Go is perfect for network applications. Its awesome standard library helps a lot in writing such software. In this article, we’ll write a simple TCP scanner in Go. The whole programm will take less than 50 lines of code. Before we’ll go to practice - a little theory. Of course, the TCP is more complicated than I describe but we need just basics. The TCP handshake is three-way. Firstly, the client sends the syn package which signals the beginning of a communication.