Golang Digest # 2 (1 – 28 February 2021)

Fresh selection of news and materials

Interesting in this issue

• Web browser

• Monitoring postal services

• Vulnerability Scanner

• Encrypted file system

Enjoy reading!

Training materials

• Tutorials for Learning Golang

• An Introduction to Go Programming

• Go by example

• A little book about Go

• A beginner’s guide to sane abstractions using Golang

• Syntax / Semantics Book

• Go-patterns (design patterns with examples in Golang)

News, events

• Modules are included by default in Go 1.16 – now the go command creates packages in modular mode by default

• Go block profiling – controls the proportion of goroutine blocking events

• Generic – proposal to add generics accepted

• Embed – the new embed package provides access to files embedded in the program at compile time with the new // go: embed directive

• Unicode – the unicode package and related system-wide support has been updated from Unicode 12.0.0 to Unicode 13.0.0, which adds 5930 new characters, including 4 new scripts and 55 new emojis

Suggestions for improving the language

• https://github.com/golang/go/issues/44221 – encoding / csv: Add the ability to get the line number of the record

  The proposal suggests a new method:

  func (r *Reader) Line() int

• https://github.com/golang/go/issues/44253 Suggestion to add array type and size to generics

  type Array8[T any] interface {
      type [8]T
  }
  
  type ArraysOfSomeSizes[T any] interface {
      type [2]T, [4]T, [8]T, [16]T
  }

  the proposal suggests the following syntax for expressing this idea:

  type Array[T any] interface {type […]T}

• https://github.com/golang/go/issues/36460 – cmd / go: Lazy loading of the module

• https://github.com/golang/go/issues/44551 Suggestion to add support for fuzzing testing

  func FuzzMarshalFoo(f *testing.F) {
      // Seed the initial corpus
   f.Add("cat", big.NewInt(1341))
   f.Add("!mouse", big.NewInt(0))
   // Run the fuzz test
     f.Fuzz(func(t *testing.T, a string, num *big.Int) {
       t.Parallel() // seed corpus tests can run in parallel
     if num.Sign() <= 0 {
       t.Skip() // only test positive numbers
    }
    val, err := MarshalFoo(a, num)
    if err != nil {
        t.Skip()
      }
    if val == nil {
        t.Fatal("MarshalFoo: val == nil, err == nil")
     }
    a2, num2, err := UnmarshalFoo(val)
    if err != nil {
        t.Fatalf("failed to unmarshal valid Foo: %v", err)
    }
    if a2 == nil || num2 == nil {
      t.Error("UnmarshalFoo: a==nil, num==nil, err==nil")
       }
    if a2 != a || !num2.Equal(num) {
       t.Error("UnmarshalFoo does not match the provided input")
     }
    })
  }

• https://github.com/golang/go/issues/44412 Suggestion to add Time.UnixMilli and Time.UnixMicro

  // UnixMilli returns the local Time corresponding to the given Unix time,
  // msec milliseconds since January 1, 1970 UTC.
  func UnixMilli(msec int64) Time {
         if msec%1e3 < 0 {
                 return unixTime(msec/1e3-1, int32((msec%1e3)1e6)+1e9)
         }
         return unixTime(msec/1e3, int32((msec%1e3)1e6))
  
  }
  
  // UnixMicro returns the local Time corresponding to the given Unix time,
  // usec milliseconds since January 1, 1970 UTC.
  func UnixMicro(usec int64) Time {
         if usec%1e6 < 0 {
                 return unixTime(usec/1e6-1, int32((usec%1e6)1e3)+1e9)
         }
         return unixTime(usec/1e6, int32((usec%1e6)1e3))
  }

Articles

• Security best practices for Go developers

• Sending and Forging Emails Using Custom Templates in Golang

• CRUD using GOA framework

• Creating the CRUD API

• Use a pointer instead of a copy of a structure?

• Examples of working with context

• Logging using context

• Why ioutil.ReadAll should be avoided

• Building Swagger and SwaggerUI for Echo Framework

• Manual memory management in Go

• Publishing a Go app to GitHub

• Deferred tasks within a microservice architecture

• Telegram on go, part 2: binary protocol

• Go & Kubernetes: Rapidly Growing Golang Microservices

• Understanding distribution in Go

• How to dynamically inject dependencies into a structure

• Dependency Injection in GO

• Go, lockdown and new MPD client – meet Ymuse

• Building a Serverless Application Using Azure Functions and Go

• Running AssemblyScript in Go

• Popular Go Backend Interview Problems and Solutions

Tools

• An example of implementing clean architecture in Go projects (Golang)

• GitOps Continuous Delivery Tool for Kubernetes Argo CD

• Scanning for various protocols TCP, DNS, HTTP, File based on templates Nuclei – vulnerability scanner

• A plugin for Terraform that allows you to manage the complete lifecycle of your AWS assets. This provider is supported within the HashiCorp AWS Provider group Terraform

• High performance json library Replacing “encoding / json”

• Subdomain discovery tool. Discovers subdomains for websites using passive online sources. It has a simple modular architecture and is optimized for speed Subfinder

• Cross platform proxy server / client with encryption Brook

• Customizable prompt mechanism for any shell that can change the prompt string using a function or variable Oh-my-posh

• Scale-out and distributed GraphQL database with graph backend Dgraph

• A tool for studying chess openings Chess-explorer-go

• Small and simple Go compiler Babygo

• Cli sql query tool: support sql, csv, ltsv, json, tbln Trdsql

• Tool to work with the MP4 file type Go-mp4

• Platform for building blockchain applications on Golang Cosmos-SDK

• Monitoring postal services, receiving emails, checking accounts Check-mail

• High performance, non-blocking tcp framework Nbio

• Fast and flexible DNS server CoreDns

• The web browser can manage cookies, history, create tabs, change user agent Surf

• Encrypted file system GoCryptfs

• Console application for tracking and monitoring cryptocurrency statistics in real time Cointop

• Git command line interface Bit

• The service collects funny commit messages from Github Commits.lol

• A file system structure providing a simple, unified, and universal API Afero

• FrodoKEM implementation, practical key encapsulation with quantum security FrodoKEM

• Mouse movement simulator Busy

Video

• A series of lessons “Developing rest api Golang”by Maksim Zhashkevych

• Golang Services Implementation Streaming Seriesby comerc

Podcasts

• GenericTalks

• Go time

• Ardan Labs. Cloud Computing Mastery

Communities

• Questions about the language on the Russian-language StackOverflow

• Information about meetups

• Forum in Google Groups

• Channel in telegram