Golang on Samarthya

Go Modules

Thu, 07 Jul 2022 12:00:00 +0000

If you are like me and getting errors while trying to compile your go lang code without having a go.mod in v1.18

package src is not in GOROOT (/usr/local/Cellar/go/1.18.3/libexec/src/src)

Remember you have overlooked a basic change that happened post 1.16

Kaniko: Jenkins Pipeline

Fri, 11 Feb 2022 12:00:00 +0000

So there are many things I have been simultaneously trying to learn & one of those is to learn how you can configure a pipeline

Objectives
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Learn Jenkins deployment on Kubernetes
Learn Jenkins Kubernetes Plugin
Learn Jenkins Pipeline (Declarative)
How to build and deploy images in Kubernetes cluster

All right, with so many monkeys on my back I had to do things the way I know it works for me.

Fun with `goroutines`

Fri, 26 Feb 2021 08:36:20 +0000

Channels are way of communication between multiple goroutines

You can declare a channel and the type of content the channel will receive like below.

var myChannel chan int

The int above is the type of data it can receive and the data can be send using

GoLang: try-catch

Mon, 22 Feb 2021 12:00:00 +0000

GoLang doesn’t have a try and catch like the popular C++ or Java languages, what it has is panic-recover.

Non critical errors are returned as normal values and for the critical ones, panic is used

GoLang: Hash

Mon, 01 Feb 2021 09:20:50 +0000

Previously I talked about files, encoding in golang. In this LTD (learn to do) I will talk about hash package in general.

https://blog.samarthya.me/wps/2021/01/30/golang-encoding/

Help
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Package crypto collects common cryptographic constants. — Official golang documentation

const (
 MD4 Hash = 1 + iota // import golang.org/x/crypto/md4
 MD5 // import crypto/md5
 SHA1 // import crypto/sha1
 SHA224 // import crypto/sha256
 SHA256 // import crypto/sha256
 SHA384 // import crypto/sha512
 SHA512 // import crypto/sha512
 MD5SHA1 // no implementation; MD5+SHA1 used for TLS RSA
 RIPEMD160 // import golang.org/x/crypto/ripemd160
 SHA3_224 // import golang.org/x/crypto/sha3
 SHA3_256 // import golang.org/x/crypto/sha3
 SHA3_384 // import golang.org/x/crypto/sha3
 SHA3_512 // import golang.org/x/crypto/sha3
 SHA512_224 // import crypto/sha512
 SHA512_256 // import crypto/sha512
 BLAKE2s_256 // import golang.org/x/crypto/blake2s
 BLAKE2b_256 // import golang.org/x/crypto/blake2b
 BLAKE2b_384 // import golang.org/x/crypto/blake2b
 BLAKE2b_512 // import golang.org/x/crypto/blake2b

)

Let’s try out a simple MD5 hasher.

GoLang: encoding

Sat, 30 Jan 2021 12:00:00 +0000

Package encoding provide capabilities to convert data to and from byte-level and textual representations.

encoding/gob
encoding/json, and
encoding/xml

The gob is Go’s format for serializing and deserializing. The gob was tailored for communicating between two servers written in Go.

Only exported fields are encoded; zero values are not taken into account

Package gob manages streams of gobs – binary values exchanged between an Encoder (transmitter) and a Decoder (receiver).

Format GoB
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Let’s create a simple Type Blog and we will encode and decode it using the gob format.

GoLang: Hex Output

Fri, 29 Jan 2021 17:47:07 +0000

In last few blogs I have written about reading commandline parameters reading files and using the os package.

In this blog, I will combine some these items to read a file byte by byte using the bufio package func’s.

GoLang: Program Banner

Fri, 29 Jan 2021 07:39:04 +0000

In the last blog I talked about command line arguments os.Args[]. In this I will try and create a sample banner program that shall

Take 3 arguments
n - Number of times a message has to be repeated.
m - The message that needs to be shown.
d - If debug message needs to be shown.

I am going to use the flags package.

GoLang: Command line arguments

Wed, 27 Jan 2021 17:06:11 +0000

Reading the golang official documentation is fun, today I saw the Variables in package os

var Args []string

It allows you to hold command line arguments and a simple main program that can help you validate this.

Files: GoLang

Mon, 25 Jan 2021 12:46:47 +0000

In the last blog, I tried reading a file in GoLang.

My repository in GitHub has all the code that I write (link)

Now, I will extend the same program to write to the same file.

Files: GoLang

Thu, 21 Jan 2021 17:26:56 +0000

Learning a new syntax and the libraries is always a task, and the only way forward is gradual. In this blog I will try to create a small program to read a text file and will keep updating the program to include more sophistication

GOLang: Reflection

Sat, 16 Jan 2021 08:18:34 +0000

Must Read
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Package reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types.

Reflection is a way to examine own structure. Let’s try and learn it via examples.

GOLang: Interfaces

Tue, 12 Jan 2021 09:26:04 +0000

Interfaces are an interesting concept to learn in GOLANG. There are a tonne of informative articles and here is my contribution to it.

In classical Object Oriented everything is treated in parlance of Object or Class like in Java or C++. In Go there is no class or inheritance.

Golang on Samarthya

Go Modules

Kaniko: Jenkins Pipeline

Objectives #

Fun with `goroutines`

GoLang: try-catch

GoLang: Hash

Help #

GoLang: encoding

Format GoB #

GoLang: Hex Output

GoLang: Program Banner

GoLang: Command line arguments

Files: GoLang

Files: GoLang

GOLang: Reflection

Must Read #

GOLang: Interfaces

Objectives
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Help
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Format GoB
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Must Read
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