go

Reading from USB COM port in go

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If you want an easy copy and paste, no nonsense way to print the output of a COM PORT to the terminal in go, then have a look at the code at the bottom of this post.

Firstly, the go.bug.st/serial/enumerator package provides a very nice interface for getting details of connected devices, and includes more details than the example code in go.bug.st/serial that I found first time around.

Thanks to the toit devs for being responsive and helping me quickly figure out how I could make my ESP spit some USB content out over the COM port.

The code

In a nutshell is this:

  • Loops forever
  • Targets a specific device ID, such a 1a86:7523
  • Waits for it to appear as connected
    • Uses baud rate 115200
    • Opens the port
    • Prints all output received to the console

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Scanning for iBeacon advertisements in Go

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I spent some time this evening faffing around trying to make a Raspberry Pi turn into a device that could detect nearby iBeacons, filtered by signal strength to find the closest, to basically create a kind of iBeacon scanner that spat out the UUID, minor and major values.

Eventually, I gave up on the Raspberry Pi for various reasons, and moved to my Windows laptop, found a good library, a working example to build on and managed to create a scanner that outputs what you see below!

The details

Searching around, I came across https://github.com/tinygo-org/bluetooth, which included an example that got me scanning for Bluetooth devices right away.

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Autoreload go code on code change

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For developers, the ability to autoreload code upon any changes is nothing short of a game-changer. It not only streamlines the development process but also fosters an environment of continuous improvement and experimentation.

There are so many packages for languages such as JavaScript for such a behaviour, but I struggled to easily find a simple-to-use go version with an example.

And that’s where this post comes in, as a simple to-the-point example extracted from what I learnt while reading https://dev.to/jacobsngoodwin/full-stack-memory-app-01-setup-go-server-with-reload-in-docker-62n

We will be making use of https://github.com/cespare/reflex, which is a go package and small tool to watch a directory and rerun a command when certain files change. 

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A copy-paste go SQL mock for GORM

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When it comes to writing robust and reliable tests for your Go applications, having a well-structured and efficient testing setup is crucial. One common challenge in testing Go applications is dealing with database interactions. To ensure that your code functions correctly, it’s essential to create a controlled environment for database operations during testing. In this blog post, we’ll explore how to create a mock GORM database for testing purposes, allowing you to isolate and verify your database interactions in a controlled manner.

Here is some copy-and-paste code (explained below) which should get you started.

import (
	"github.com/DATA-DOG/go-sqlmock"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

func NewMockGORM() (GORM *gorm.DB, close func()) {
	db, mock, err := sqlmock.New()
	if err != nil {
		panic(err)
	}

	// GORM always runs this query, so mock it for all tests
	mock.ExpectQuery("SELECT VERSION()").WillReturnRows(sqlmock.NewRows([]string{"version"}).AddRow("5.7.0"))

	GORM, err = gorm.Open(mysql.New(mysql.Config{Conn: db}), &gorm.Config{Logger: logger.Default.LogMode(logger.Silent)})
	if err != nil {
		panic(err)
	}

	return GORM, func() { db.Close() }
}Code language: PHP (php)

The code block above defines a NewMockGORM function that sets up a mock GORM database instance for testing. Let’s break down what this code does and how it can be a valuable addition to your testing toolkit.

Setting up a Mock GORM Database

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Dependency injection in go using fx, and replacing services for test

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I’m writing a new go application and ended up giving fx (by uber) a try for dependency injection. The getting started docs were brilliant for my use case (creating an API), but the examples for how to inject mock services for tests were lacking, so I decided to write some code examples of how I am currently using fx in tests.

General app setup

I set up my whole application in a app package, which pulls in all services that are needed.

Most of these are provided as constructor functions, with some more dynamic registration of routes as is done in the getting started docs.

package app

func New(additionalOpts ...fx.Option) *fx.App {
	return fx.New(
		fx.Provide(
			config.NewDefault,
			ses.NewSES,
			ses.NewEmailSender,
			mysql.NewGormGB,
			middleware.NewLimiterFactory,
			middleware.NewAuth,
			AsRoute(handlers.UserLogin),
			AsRoute(handlers.ListStuff),
			fx.Annotate(
				router.NewGinRouter,
				fx.ParamTags(`group:"routes"`),
			),
			server.NewHTTPServer,
		),
		fx.Invoke(func(*http.Server) {}),
		fx.Options(additionalOpts...),
	)
}Code language: Go (go)

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cobra: unable to redefine ‘h’ shorthand

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“Cobra is both a library for creating powerful modern CLI applications as well as a program to generate applications and command files”

I’m currently using Cobra in the MediaWiki CLI project and recently came across an error while trying to auto-generate docs.

panic: unable to redefine 'h' shorthand in "login" flagset: it's already used for "hostname" flag

goroutine 1 [running]:
github.com/spf13/pflag.(*FlagSet).AddFlag(0xc0000b5d00, 0xc00053d680)
        /go/pkg/mod/github.com/spf13/pflag@v1.0.5/flag.go:874 +0x6f0Code language: PHP (php)

I’m not actually trying to redefine this flag, but it looks like by default cobra always uses the -h flag for a help command, if you don’t define a help flag that doesn’t have the shorthand.

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Go Docker SDK, Raw Terminal Ctrl+C handling

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I spent my weekend in working on a new project called dockerit. It’s a simple wrapper around Docker written in Go and making use of the Docker SDK.

One of the biggest sticking points for me, being fairly new with the Golang world, was trying to pass stdin stdout and stderr between the container and host terminal correctly, while also having good performance and doing the expected things (like Ctrl+C to cancel).

The full code for setting up and, interacting with and removing my container can be found here. The main steps are broken down below.

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Simple Go defer code example

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In Go, a defer statement will execute a function call just before the function it is called from returns.

I found that most of the examples of a Go defer call online seemed to do complicated things with numbers. So here is a nice simple example with just text output.

Example

You can run this code yourself in The Go Playground! You can also find a similar example in the Go Tour.

package main

import (
	"fmt"
)

func main() {
	// This will output first (in order)
	fmt.Println("One")
	
	// This will output last (before this function finishes)
	defer fmt.Println("Two")
	
	// This will be called before the above defer call "Two"
	secondary()
}


func secondary() {
	// This will output after Four (before this function finishes)
	defer fmt.Println("Three")
	
	// This will output (in order)
	fmt.Println("Four")
}

Code language: JavaScript (javascript)

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