Prometheus instrumentation Library for Go Applications

Prometheus Go client library

This is the Go client library for Prometheus. It has two separate parts, one for instrumenting application code, and one for creating clients that talk to the Prometheus HTTP API.

This library requires Go1.13 or later.

Important note about releases and stability

This repository generally follows Semantic Versioning. However, the API client in prometheus/client_golang/api/… is still considered experimental. Breaking changes of the API client will not trigger a new major release. The same is true for selected other new features explicitly marked as EXPERIMENTAL in CHANGELOG.md.

Features that require breaking changes in the stable parts of the repository are being batched up and tracked in the v2 milestone. The v2 development happens in a separate branch for the time being. v2 releases off that branch will happen once sufficient stability is reached. In view of the widespread use of this repository, v1 and v2 will coexist for a while to enable a convenient transition.

Instrumenting applications

 The prometheus directory contains the instrumentation library. See the guide on the Prometheus website to learn more about instrumenting applications.

The examples directory contains simple examples of instrumented code.

Client for the Prometheus HTTP API

 The api/prometheus directory contains the client for the Prometheus HTTP API. It allows you to write Go applications that query time series data from a Prometheus server. It is still in alpha stage.

Where is model, extraction, and text?

The model packages has been moved to prometheus/common/model.

The extraction and text packages are now contained in prometheus/common/expfmt.

Contributing and community

See the contributing guidelines and the Community section of the homepage.

Author: Prometheus
Source Code: https://github.com/prometheus/client_golang 
License: Apache-2.0 License

#go #golang 

What is GEEK

Buddha Community

What's new in the go 1.15

Go announced Go 1.15 version on 11 Aug 2020. Highlighted updates and features include Substantial improvements to the Go linker, Improved allocation for small objects at high core counts, X.509 CommonName deprecation, GOPROXY supports skipping proxies that return errors, New embedded tzdata package, Several Core Library improvements and more.

As Go promise for maintaining backward compatibility. After upgrading to the latest Go 1.15 version, almost all existing Golang applications or programs continue to compile and run as older Golang version.

#go #golang #go 1.15 #go features #go improvement #go package #go new features

Top 8 Machine Learning Libraries In Go Language One Must Know

Created by Google researchers, Go is a popular open-source programming language. The language includes many intuitive features, including a garbage collector, cross-platform, efficient concurrency, among others.

According to the Stack Overflow Developer Survey 2020, Go language is not only the fifth most loved programming language but also fetches the programmers the third-highest salary among other languages.

Below here, we list down the top machine learning libraries in Go language.

#opinions #go language #google ml tools #machine learning libraries #ml libraries #ml libraries in go

Prometheus instrumentation Library for Go Applications

Prometheus Go client library

This is the Go client library for Prometheus. It has two separate parts, one for instrumenting application code, and one for creating clients that talk to the Prometheus HTTP API.

This library requires Go1.13 or later.

Important note about releases and stability

This repository generally follows Semantic Versioning. However, the API client in prometheus/client_golang/api/… is still considered experimental. Breaking changes of the API client will not trigger a new major release. The same is true for selected other new features explicitly marked as EXPERIMENTAL in CHANGELOG.md.

Features that require breaking changes in the stable parts of the repository are being batched up and tracked in the v2 milestone. The v2 development happens in a separate branch for the time being. v2 releases off that branch will happen once sufficient stability is reached. In view of the widespread use of this repository, v1 and v2 will coexist for a while to enable a convenient transition.

Instrumenting applications

 The prometheus directory contains the instrumentation library. See the guide on the Prometheus website to learn more about instrumenting applications.

The examples directory contains simple examples of instrumented code.

Client for the Prometheus HTTP API

 The api/prometheus directory contains the client for the Prometheus HTTP API. It allows you to write Go applications that query time series data from a Prometheus server. It is still in alpha stage.

Where is model, extraction, and text?

The model packages has been moved to prometheus/common/model.

The extraction and text packages are now contained in prometheus/common/expfmt.

Contributing and community

See the contributing guidelines and the Community section of the homepage.

Author: Prometheus
Source Code: https://github.com/prometheus/client_golang 
License: Apache-2.0 License

#go #golang 

10 Favorite Libraries for Building GUI Applications in Go

In today's post we will learn about 10 Favorite Libraries for Building GUI Applications in Go. 

What is the GUI application?

A graphical user interface (GUI) application is one that is designed using graphical features such as windows, menus, dialog boxes, and features that make the application easy to use. When you compile a GUI application, an executable file with start-up code is created.

Table of contents:

• App - Package to create apps with GO, HTML and CSS. Supports: MacOS, Windows in progress.
• Fyne - Cross platform native GUIs designed for Go based on Material Design. Supports: Linux, macOS, Windows, BSD, iOS and Android.
• UI - Platform-native GUI library for Go. Cross platform.
• Go-astilectron - Build cross platform GUI apps with GO and HTML/JS/CSS (powered by Electron).
• Walk - Windows application library kit for Go.
• Go-sciter - Go bindings for Sciter: the Embeddable HTML/CSS/script engine for modern desktop UI development. Cross platform.
• Goradd/html5tag - Library for outputting HTML5 tags.
• Gotk3 - Go bindings for GTK3.
• Gowd - Rapid and simple desktop UI development with GO, HTML, CSS and NW.js. Cross platform.
• QT - Qt binding for Go (support for Windows / macOS / Linux / Android / iOS / Sailfish OS / Raspberry Pi).

1 - App: Package to create apps with GO, HTML and CSS. Supports: MacOS, Windows in progress.

Go-app is a package for building progressive web apps (PWA) with the Go programming language (Golang) and WebAssembly (Wasm).

Shaping a UI is done by using a declarative syntax that creates and compose HTML elements only by using the Go programing language.

It uses Go HTTP standard model.

An app created with go-app can out of the box run in its own window, supports offline mode, and are SEO friendly.

Install

go-app requirements:

• Go 1.18 or newer
• Go module

go mod init go get -u github.com/maxence-charriere/go-app/v9/pkg/app

Declarative syntax

Go-app uses a declarative syntax so you can write reusable component-based UI elements just by using the Go programming language.

Here is a Hello World component that takes an input and displays its value in its title:

type hello struct {
	app.Compo

	name string
}

func (h *hello) Render() app.UI {
	return app.Div().Body(
		app.H1().Body(
			app.Text("Hello, "),
			app.If(h.name != "",
				app.Text(h.name),
			).Else(
				app.Text("World!"),
			),
		),
		app.P().Body(
			app.Input().
				Type("text").
				Value(h.name).
				Placeholder("What is your name?").
				AutoFocus(true).
				OnChange(h.ValueTo(&h.name)),
		),
	)
}

Standard HTTP

Apps created with go-app complies with Go standard HTTP package interfaces.

func main() {
	// Components routing:
	app.Route("/", &hello{})
	app.Route("/hello", &hello{})
	app.RunWhenOnBrowser()

	// HTTP routing:
	http.Handle("/", &app.Handler{
		Name:        "Hello",
		Description: "An Hello World! example",
	})

	if err := http.ListenAndServe(":8000", nil); err != nil {
		log.Fatal(err)
	}
}

View on Github

2 - Fyne: Cross platform native GUIs designed for Go based on Material Design. Supports: Linux, macOS, Windows, BSD, iOS and Android.

About

Fyne is an easy-to-use UI toolkit and app API written in Go. It is designed to build applications that run on desktop and mobile devices with a single codebase.

Version 2.2 is the current release of the Fyne API, it added system tray support, App.Metadata as well as richer menus and support for building WASM apps. We are now working towards the next big release, codenamed cragganmore and more news will follow in our news feeds and GitHub project.

Prerequisites

To develop apps using Fyne you will need Go version 1.14 or later, a C compiler and your system's development tools. If you're not sure if that's all installed or you don't know how then check out our Getting Started document.

Using the standard go tools you can install Fyne's core library using:

$ go get fyne.io/fyne/v2

Widget demo

To run a showcase of the features of Fyne execute the following:

$ go get fyne.io/fyne/v2/cmd/fyne_demo/
$ fyne_demo

Getting Started

Fyne is designed to be really easy to code with. If you have followed the prerequisite steps above then all you need is a Go IDE (or a text editor).

Open a new file and you're ready to write your first app!

package main

import (
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/widget"
)

func main() {
	a := app.New()
	w := a.NewWindow("Hello")

	hello := widget.NewLabel("Hello Fyne!")
	w.SetContent(container.NewVBox(
		hello,
		widget.NewButton("Hi!", func() {
			hello.SetText("Welcome :)")
		}),
	))

	w.ShowAndRun()
}

And you can run that simply as:

$ go run main.go

It should look like this:

Note that Windows applications load from a command prompt by default, which means if you click an icon you may see a command window. To fix this add the parameters -ldflags -H=windowsgui to your run or build commands.

Run in mobile simulation

There is a helpful mobile simulation mode that gives a hint of how your app would work on a mobile device:

$ go run -tags mobile main.go

Another option is to use fyne command, see Packaging for mobile.

Installing

Using go install will copy the executable into your go bin dir. To install the application with icons etc into your operating system's standard application location you can use the fyne utility and the "install" subcommand.

$ go get fyne.io/fyne/v2/cmd/fyne
$ fyne install

View on Github

3 - UI: Platform-native GUI library for Go. Cross platform.

This is a library that aims to provide simple GUI software development in Go. It is based on my libui, a simple cross-platform library that does the same thing, but written in C.

It runs on/requires:

• Windows: cgo, Windows Vista SP2 with Platform Update and newer
• Mac OS X: cgo, Mac OS X 10.8 and newer
• other Unixes: cgo, GTK+ 3.10 and newer
  • Debian, Ubuntu, etc.: sudo apt-get install libgtk-3-dev
  • Red Hat/Fedora, etc.: sudo dnf install gtk3-devel

It also requires Go 1.8 or newer.

It currently aligns to libui's Alpha 4.1, with only a small handful of functions not available.

Status

Package ui is currently mid-alpha software. Much of what is currently present runs stabily enough for the examples and perhaps some small programs to work, but the stability is still a work-in-progress, much of what is already there is not feature-complete, some of it will be buggy on certain platforms, and there's a lot of stuff missing. The libui README has more information.

Installation

Once you have the dependencies installed, a simple

go get github.com/andlabs/ui/...

should suffice.

Documentation

The in-code documentation is sufficient to get started, but needs improvement.

Some simple example programs are in the examples directory. You can go build each of them individually.

Windows manifests

Package ui requires a manifest that specifies Common Controls v6 to run on Windows. It should at least also state as supported Windows Vista and Windows 7, though to avoid surprises with other packages (or with Go itself; see this issue) you should state compatibility with higher versions of Windows too.

The simplest option is provided as a subpackage winmanifest; you can simply import it without a name, and it'll set things up properly:

import _ "github.com/andlabs/ui/winmanifest"

You do not have to worry about importing this in non-Windows-only files; it does nothing on non-Windows platforms.

If you wish to use your own manifest instead, you can use the one in winmanifest as a template to see what's required and how. You'll need to specify the template in a .rc file and use windres in MinGW-w64 to generate a .syso file as follows:

windres -i resources.rc -o winmanifest_windows_GOARCH.syso -O coff

You may also be interested in the github.com/akavel/rsrc and github.com/josephspurrier/goversioninfo packages, which provide other Go-like options for embedding the manifest.

Note that if you choose to ship a manifest as a separate .exe.manifest file instead of embedding it in your binary, and you use Cygwin or MSYS2 as the source of your MinGW-w64, Cygwin and MSYS2 instruct gcc to embed a default manifest of its own if none is specified. This default will override your manifest file! See this issue for more details, including workaround instructions.

View on Github

4 - Go-astilectron: Build cross platform GUI apps with GO and HTML/JS/CSS (powered by Electron).

Thanks to go-astilectron build cross platform GUI apps with GO and HTML/JS/CSS. It is the official GO bindings of astilectron and is powered by Electron.

Demo

To see a minimal Astilectron app, checkout out the demo.

It uses the bootstrap and the bundler.

If you're looking for a minimalistic example, run go run example/main.go -v.

Real-life examples

Here's a list of awesome projects using go-astilectron (if you're using go-astilectron and want your project to be listed here please submit a PR):

• go-astivid Video tools written in GO
• GroupMatcher Program to allocate persons to groups while trying to fulfill all the given wishes as good as possible
• Stellite GUI Miner An easy to use GUI cryptocurrency miner for Stellite

Bootstrap

For convenience purposes, a bootstrap has been implemented.

The bootstrap allows you to quickly create a one-window application.

There's no obligation to use it, but it's strongly recommended.

If you decide to use it, read thoroughly the documentation as you'll have to structure your project in a specific way.

Bundler

Still for convenience purposes, a bundler has been implemented.

The bundler allows you to bundle your app for every os/arch combinations and get a nice set of files to send your users.

Quick start

WARNING: the code below doesn't handle errors for readibility purposes. However you SHOULD!

Import go-astilectron

To import go-astilectron run:

$ go get -u github.com/asticode/go-astilectron

Start go-astilectron

// Initialize astilectron
var a, _ = astilectron.New(log.New(os.Stderr, "", 0), astilectron.Options{
    AppName: "<your app name>",
    AppIconDefaultPath: "<your .png icon>", // If path is relative, it must be relative to the data directory
    AppIconDarwinPath:  "<your .icns icon>", // Same here
    BaseDirectoryPath: "<where you want the provisioner to install the dependencies>",
    VersionAstilectron: "<version of Astilectron to utilize such as `0.33.0`>",
    VersionElectron: "<version of Electron to utilize such as `4.0.1` | `6.1.2`>",
})
defer a.Close()

// Start astilectron
a.Start()

// Blocking pattern
a.Wait()

For everything to work properly we need to fetch 2 dependencies : astilectron and Electron. .Start() takes care of it by downloading the sources and setting them up properly.

In case you want to embed the sources in the binary to keep a unique binary you can use the NewDisembedderProvisioner function to get the proper Provisioner and attach it to go-astilectron with .SetProvisioner(p Provisioner). Or you can use the bootstrap and the bundler. Check out the demo to see how to use them.

Beware when trying to add your own app icon as you'll need 2 icons : one compatible with MacOSX (.icns) and one compatible with the rest (.png for instance).

If no BaseDirectoryPath is provided, it defaults to the executable's directory path.

The majority of methods are asynchronous which means that when executing them go-astilectron will block until it receives a specific Electron event or until the overall context is cancelled. This is the case of .Start() which will block until it receives the app.event.ready astilectron event or until the overall context is cancelled.

View on Github

5 - Walk: Windows application library kit for Go.

About Walk

Walk is a "Windows Application Library Kit" for the Go Programming Language.

Its primarily useful for Desktop GUI development, but there is some more stuff.

Setup

Make sure you have a working Go installation. See Getting Started

Note

Walk currently requires Go 1.11.x or later.

To Install

Now run go get github.com/lxn/walk

Using Walk

The preferred way to create GUIs with Walk is to use its declarative sub package, as illustrated in this small example:

test.go

package main

import (
	"github.com/lxn/walk"
	. "github.com/lxn/walk/declarative"
	"strings"
)

func main() {
	var inTE, outTE *walk.TextEdit

	MainWindow{
		Title:   "SCREAMO",
		MinSize: Size{600, 400},
		Layout:  VBox{},
		Children: []Widget{
			HSplitter{
				Children: []Widget{
					TextEdit{AssignTo: &inTE},
					TextEdit{AssignTo: &outTE, ReadOnly: true},
				},
			},
			PushButton{
				Text: "SCREAM",
				OnClicked: func() {
					outTE.SetText(strings.ToUpper(inTE.Text()))
				},
			},
		},
	}.Run()
}

Create Manifest test.manifest

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
    <assemblyIdentity version="1.0.0.0" processorArchitecture="*" name="SomeFunkyNameHere" type="win32"/>
    <dependency>
        <dependentAssembly>
            <assemblyIdentity type="win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0" processorArchitecture="*" publicKeyToken="6595b64144ccf1df" language="*"/>
        </dependentAssembly>
    </dependency>
    <application xmlns="urn:schemas-microsoft-com:asm.v3">
        <windowsSettings>
            <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2, PerMonitor</dpiAwareness>
            <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">True</dpiAware>
        </windowsSettings>
    </application>
</assembly>

View on Github

6 - Go-sciter: Go bindings for Sciter: the Embeddable HTML/CSS/script engine for modern desktop UI development. Cross platform.

Go bindings for Sciter   

Check this page for other language bindings (Delphi / D / Go / .NET / Python / Rust).

---

Attention

The ownership of project is transferred to this new organization. Thus the import path for golang should now be github.com/sciter-sdk/go-sciter, but the package name is still sciter.

Introduction

This package provides a Golang bindings of Sciter using cgo. Using go sciter you must have the platform specified sciter dynamic library downloaded from sciter-sdk, the library itself is rather small (under 5MB, less than 2MB when upxed) .

Most Sciter API are supported, including:

• Html string/file loading
• DOM manipulation/callback/event handling
• DOM state/attribute handling
• Custom resource loading
• Sciter Behavior
• Sciter Options
• Sciter Value support
• NativeFunctor (used in sciter scripting)

And the API are organized in more or less a gopher friendly way.

Things that are not supported:

• Sciter Node API
• TIScript Engine API

Getting Started

At the moment only Go 1.10 or higher is supported (issue #136).

Download the sciter-sdk

Extract the sciter runtime library from sciter-sdk to system PATH

The runtime libraries lives in bin bin.lnx bin.osx with suffix like dll so or dylib

• Windows: simply copying bin\64\sciter.dll to c:\windows\system32 is just enough
• Linux:
  • cd sciter-sdk/bin.lnx/x64
  • export LIBRARY_PATH=$PWD
  • echo $PWD >> libsciter.conf
  • sudo cp libsciter.conf /etc/ld.so.conf.d/
  • sudo ldconfig
  • ldconfig -p | grep sciter should print libsciter-gtk.so location
• OSX:
  • cd sciter-sdk/bin.osx/
  • export DYLD_LIBRARY_PATH=$PWD

Set up GCC envrionmnet for CGO

mingw64-gcc (5.2.0 and 7.2.0 are tested) is recommended for Windows users.

Under Linux gcc(4.8 or above) and gtk+-3.0 are needed.

go get -x github.com/sciter-sdk/go-sciter

Run the example and enjoy :)

View on Github

7 - Goradd/html5tag: Library for outputting HTML5 tags.

html5tag

The html5tag package contains utilities to generate html 5 tags. Choose between string versions of the functions for easy tag creation, or io.Writer versions for speed.

html5tag also has a tag builder for convenience and can perform math operations on numeric style values.

html5tag does some checks to make sure tags are well-formed. For example, when adding data-* attributes, it will make sure the key used for the attribute does not violate html syntax rules.

html5tag has options to pretty-print tags and the content of tags so they appear formatted in a document. However, in certain contexts, like in inline text, or in a textarea tag, adding extra returns and spaces changes the look of the output. In these situations, use the functions that do not add spaces to the inner HTML of a tag.

Some examples:

package main

import . "github.com/goradd/html5tag"

main() {
	
	// Render an input tag, inside a div tag, inside a body tag using different tag building mechanisms

	a := NewAttributes().
	SetID("myText").
	Set("text", "Hi there").
	Set("placeholder", "Write here").
	SetClass("class1 class2").
	SetStyle("width":"20em")
	
	inputTag := RenderVoidTag("input", a)
	divTag := RenderTag("div", Attriubtes{"id":"inputWrapper"}, inputTag)
	
	bodyTag := NewTagBuilder().
		Tag("body").
		ID("bodyId").
		InnerHtml(divTag).
		String()
	
	fmt.Print(bodyTag)
}

For complete documentation, start at the documentation for RenderTag() and WriteTag() and drill down from there.

View on Github

8 - Gotk3 - Go bindings for GTK3.

The gotk3 project provides Go bindings for GTK 3 and dependent projects. Each component is given its own subdirectory, which is used as the import path for the package. Partial binding support for the following libraries is currently implemented:

• GTK 3 (3.12 and later)
• GDK 3 (3.12 and later)
• GLib 2 (2.36 and later)
• Cairo (1.10 and later)

Care has been taken for memory management to work seamlessly with Go's garbage collector without the need to use or understand GObject's floating references.

for better understanding see package reference documation

On Linux, see which version your distribution has here with the search terms:

• libgtk-3
• libglib2
• libgdk-pixbuf2

Sample Use

The following example can be found in Examples.

package main

import (
    "github.com/gotk3/gotk3/gtk"
    "log"
)

func main() {
    // Initialize GTK without parsing any command line arguments.
    gtk.Init(nil)

    // Create a new toplevel window, set its title, and connect it to the
    // "destroy" signal to exit the GTK main loop when it is destroyed.
    win, err := gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
    if err != nil {
        log.Fatal("Unable to create window:", err)
    }
    win.SetTitle("Simple Example")
    win.Connect("destroy", func() {
        gtk.MainQuit()
    })

    // Create a new label widget to show in the window.
    l, err := gtk.LabelNew("Hello, gotk3!")
    if err != nil {
        log.Fatal("Unable to create label:", err)
    }

    // Add the label to the window.
    win.Add(l)

    // Set the default window size.
    win.SetDefaultSize(800, 600)

    // Recursively show all widgets contained in this window.
    win.ShowAll()

    // Begin executing the GTK main loop.  This blocks until
    // gtk.MainQuit() is run.
    gtk.Main()
}

To build the example:

$ go build example.go

To build this example with older gtk version you should use gtk_3_10 tag:

$ go build -tags gtk_3_10 example.go

View on Github

9 - Gowd: Rapid and simple desktop UI development with GO, HTML, CSS and NW.js. Cross platform.

Build cross platform GUI apps with GO and HTML/JS/CSS (powered by nwjs)

How to use this library:

Download and install nwjs

Install this library go get github.com/dtylman/gowd

Clone this repo.

Place package.json, index.html, main.go and main.js from template in a new folder.

go build

Edit main.js and set goBinary to your your executable name:

var goBinary = "./template"; //or template.exe

Run nw ., the hello world template should appear:

 

Usage

Simplest "hello world":

import "github.com/dtylman/gowd"

func main() {
	body, err := gowd.ParseElement("<h1>Hello world</h1>", nil)
	if err != nil {
		panic(err)
	}
	gowd.Run(body)
}

Adding a button:

import (
	"github.com/dtylman/gowd"
)

func main() {
	body, err := gowd.ParseElement("<h1>Hello world</h1>", nil)
	if err != nil {
		panic(err)
	}
	p := body.AddElement(gowd.NewElement("p"))
	btn := p.AddElement(gowd.NewElement("button"))
	btn.SetText("Click me")
	btn.OnEvent(gowd.OnClick, btnClicked)
	gowd.Run(body)
}

func btnClicked(sender *gowd.Element, event *gowd.EventElement) {
	sender.SetText("Clicked!")
}

View on Github

10 - QT: Qt binding for Go (support for Windows / macOS / Linux / Android / iOS / Sailfish OS / Raspberry Pi).

Introduction

Qt is a free and open-source widget toolkit for creating graphical user interfaces as well as cross-platform applications that run on various software and hardware platforms with little or no change in the underlying codebase.

Go, also known as Golang, is a programming language designed at Google.

therecipe/qt allows you to write Qt applications entirely in Go, JavaScript/TypeScript, Dart/Flutter, Haxe and Swift

Beside the language bindings provided, therecipe/qt also greatly simplifies the deployment of Qt applications to various software and hardware platforms.

At the time of writing, almost all Qt functions and classes are accessible, and you should be able to find everything you need to build fully featured Qt applications.

Impressions

Gallery of example applications.

JavaScript Demo | source

Installation

The following instructions assume that you already installed Go and Git

(Experimental) cgo-less version (try this first, if you are new and want to test the binding)

Windows

go get -ldflags="-w" github.com/therecipe/examples/basic/widgets && for /f %v in ('go env GOPATH') do %v\bin\widgets.exe

macOS/Linux

go get -ldflags="-w" github.com/therecipe/examples/basic/widgets && $(go env GOPATH)/bin/widgets

Default version

Windows (more info)

set GO111MODULE=off
go get -v github.com/therecipe/qt/cmd/... && for /f %v in ('go env GOPATH') do %v\bin\qtsetup test && %v\bin\qtsetup -test=false

macOS (more info)

export GO111MODULE=off; xcode-select --install; go get -v github.com/therecipe/qt/cmd/... && $(go env GOPATH)/bin/qtsetup test && $(go env GOPATH)/bin/qtsetup -test=false

Linux (more info)

export GO111MODULE=off; go get -v github.com/therecipe/qt/cmd/... && $(go env GOPATH)/bin/qtsetup test && $(go env GOPATH)/bin/qtsetup -test=false

View on Github

Thank you for following this article.

Related videos:

Create GUI Apps with Go | Fyne Toolkit | Awesome Go

#go #golang #gui #applications 

Go-web-workshop: Build Web Applications with Go on App Engine

Building Web Applications with Go

Welcome, gopher! You're not a gopher? Well, this workshop is for gophers, or people that use the Go programming language. But fear not if you've never written any Go before! I'd recommend you learn the basics for the language first with the Go tour.

This workshop has been run a couple of times with an instructor leading. The goal of this repo is to make it as easy as possible for individuals to follow the content by themselves. If you get stuck at any point, feel free to file issues asking questions.

Setting up your workspace

To go through this you will need the following:

1. You have installed the Go Programming Language.
2. You have set up a GOPATH by following the How to Write Go Code tutorial.
3. You are somewhat familiar with the basics of Go. (The Go Tour is a pretty good place to start)
4. You have a Google account and you have installed the Google Cloud SDK.

Contents

There's a lot to say about how to build web applications, in Go or any other language. But we only have one day so we won't try to cover too much. Instead we'll cover the basics, so you'll be able to explore other solutions and frameworks later.

The workshops is divided in eleven sections:

• 0: Hello world
• 1: Web Clients
• 2: Web servers
• 3: Input validation and status codes
• 4: Deploying to App Engine
• 5: Hello, HTML
• 6: JSON encoding and decoding
• 7: Durable storage with Cloud Datastore
• 8: Retrieving remote resources with urlfetch
• 9: What is Memcache and how to use it from App Engine
• 10: Congratulations!

Resources

These are places where you can find more information for Go:

• golang.org
• godoc.org, where you can find the documentation for any package.
• The Go Programming Language Blog

My favorite aspect of Go is its community, and you are now part of it too. Welcome!

As a newcomer to the Go community you might have questions or get blocked at some point. This is completely normal, and we're here to help you. Some of the places where gophers tend to hang out are:

• The Go Forum
• #go-nuts IRC channel at Freenode
• Gophers’ community on Slack (signup here for an account).
• @golang and #golang on Twitter.
• Go+ community on Google Plus.
• Go user meetups
• golang-nuts mailing list
• Go community Wiki

Disclaimer

This is not an official Google product (experimental or otherwise), it is just code that happens to be owned by Google.

Author: Campoy
Source Code: https://github.com/campoy/go-web-workshop 
License: Apache-2.0 license

#go #golang #web