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Thiago Pacheco
Thiago Pacheco

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Create a Restful API with Golang from scratch

#go #postgres #docker #debug

In this tutorial, we are going to walk through an example of how to create a Restful API with Golang. We are going to cover the initial setup of the application, how to structure your app, how to handle persistence, docker config, HTTP requests and even debugging with vscode.
This tutorial covers many concepts since the basics of setting up an application, so I recommend that you check the table of contents below, decide how you want to follow this tutorial and maybe jump to the sections you are more interested in.

Table of contents

Why Golang?

Golang is an extremely lightweight and fast language that can be used to build CLIs, DevOps and SRE, web development, distributed services, database implementations, and much more. Applications like Docker and Kubernetes are written in Go for example.
Go is known for its performance and by its simplicity to learn (only 25 reserved keywords) and improve the existing codebase.

Initial setup

Create your folder and initialize the app

mkdir go-todo
cd go-todo
git init
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Go has its own package manager, and it is handled through the go.mod file. To generate this base file you can run the following command:

go mod init <YOUR API NAME>
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You can replace the <YOUR API NAME> for whatever name you want to give your app, but keep in mind that the convention is to use the name of the remote repository your app will be available.
For example github.com/pachecoio/go-todo

go mod init github.com/pachecoio/go-todo
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This is especially important because that is how Go manages dependencies. Go does not download the dependencies to your local project directory, rather it handles them in a decentralized fashion through modules and we will be seeing that soon in the following sections.
If you want to dive deeper into this concept, you can check out the here to learn more about it.

Now let's create our entry point file for this app.

touch main.go # Create a main.go file
code . # Open with vscode
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Let's include some boilerplate code to test our initial setup:

package main

import "fmt"

func main() {
    fmt.Println("App running")
}
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You can run this app by running go main.go in your terminal or pressing F5 if you are using vscode.

Create your first endpoint with fiber

In this example, we will be using Fiber to handle our HTTP requests and create the base structure of the API.

Fiber is a Web Framework built with Fasthttp and inspired by Express, designed to ease things up for fast development with zero memory allocation and performance in mind.

First, let's fetch the fiber dependencies:

go get github.com/gofiber/fiber/v2
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Now we can import the fiber modules into the main.go file and replace the code inside the main function.

package main

import (
    "log"

    "github.com/gofiber/fiber/v2"
    "github.com/gofiber/fiber/v2/middleware/cors"
)

func main() {
    app := fiber.New()
    app.Use(cors.New())

    api := app.Group("/api")

    // Test handler
    api.Get("/", func(c *fiber.Ctx) error {
        return c.SendString("App running")
    })

    log.Fatal(app.Listen(":5000"))
}
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Let's walk through what is happening here:

First we can see that go uses the URLs of the remote repos for importing the dependencies/modules.
Next we create a new fiber instance that contains a series of helpers and the main function is to listen to HTTP requests on port 5000 as specified at the end of the file.
The api variable is an example of a grouping that can be used to organize the endpoint paths. In this example, we have used the /api extension and that means that our base URL to access the endpoints would be http://localhost:5000/api.

At this point you can run the app again and try to make a request to http://localhost:5000/api and receive the following response:

App running
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You can test it by just typing this URL in your browser but I would recommend using an HTTP client like Insomnia, as it would be also required for the rest of this lesson.

Run with Docker

At this point, we already can run the app and debug it with vscode by pressing F5, but the more we add dependencies and complexity it gets harder to have a production ready app as we rely too much on our local setup (especially when we start adding databases into it).
So a good solution for that is to containerize this app with Docker.

You can skip this section if you don't want to run this with Docker, but keep in mind that for the following sections you would need a Postgres database up and running to continue the tutorial.

Setup Dockerfile

The first step here is to create the Dockerfile:

FROM golang:1.16-alpine AS base
WORKDIR /app

ENV GO111MODULE="on"
ENV GOOS="linux"
ENV CGO_ENABLED=0

RUN apk update \
    && apk add --no-cache \
    ca-certificates \
    curl \
    tzdata \
    git \
    && update-ca-certificates

FROM base AS dev
WORKDIR /app

RUN go get -u github.com/cosmtrek/air && go install github.com/go-delve/delve/cmd/dlv@latest
EXPOSE 5000
EXPOSE 2345

ENTRYPOINT ["air"]

FROM base AS builder
WORKDIR /app

COPY . /app
RUN go mod download \
    && go mod verify

RUN go build -o todo -a .

FROM alpine:latest as prod

COPY --from=builder /app/todo /usr/local/bin/todo
EXPOSE 5000

ENTRYPOINT ["/usr/local/bin/todo"]
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Let's walk through what is happening here:
You can skip this section if you are already familiar with Docker.

  • First, we refer to the base image golang:1.16-alpine and we set an alias called base.
  • Lines 4 to 6 we set up some base environment variables:
    • GO111MODULE=on Forces go to use modules even if the project is in the GOPATH. Requires go.mod to work
    • GOOS=linux tells the compiler for which OS it needs to build.
    • CGO_ENABLED=0 allows the program to build without any external dependencies, using a statically-linked binary.
  • Lines 8 to 14 are used to update local dependencies and install ca-certificates (important if you aim to use SSL/TLS)
  • Line 16 we create a dev stage based on the base stage
  • Line 19 we install air, which will be used for hot-reloading
  • Lines 20 and 21 we expose the main port 5000 and the debug port 2345.

  • Line 23 we have the entry point for the dev stage, which basically runs air

  • Next from lines 25 to 32 we create a builder stage, which is used to create a compiled application for a production run. In this step, we basically copy all the code, install the dependencies and compile the app.

  • And last but not least, from lines 34 to 39 we set up our prod config, where we pull the compiled code from the builder stage, expose the port 5000 and set up the entry point for this compiled app.

Include Air for hot-reloading

We are going to be using air to allow hot-reloads on dev/debug mode. The Dockerfile already accounts for that, but we still need to include the air config.
Let's include that by creating a new file called .air.toml with the following content:

# Config file for [Air](https://github.com/cosmtrek/air) in TOML format

# Working directory
# . or absolute path, please note that the directories following must be under root.
root = "."
tmp_dir = "tmp"

[build]
# Just plain old shell command. You could use `make` as well.
cmd = "go build -gcflags='all=-N -l' -o ./tmp/main ."
# Binary file yields from `cmd`.
bin = "tmp/main"
# Customize binary.
full_bin = "dlv exec --accept-multiclient --log --headless --continue --listen :2345 --api-version 2 ./tmp/main"
# Watch these filename extensions.
include_ext = ["go", "tpl", "tmpl", "html"]
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Create a docker-compose.yaml config

Now let's add a docker-compose.yaml file so we can continuously build, run and customize this app easily.

# docker-compose.yaml
version: "3.7"

services:
  go-todo:
    container_name: go-todo
    image: thisk8brd/go-todo:dev
    build:
      context: .
      target: dev
    volumes:
      - .:/app
    ports:
      - "5000:5000"
      - "2345:2345"
    networks:
      - go-todo-network

networks:
  go-todo-network:
    name: go-todo-network
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Awesome!
At this point, you should be able to run with docker and have the same result as the last section.
To run the app, execute the following command in your terminal:

docker compose up
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Visit the http://localhost:5000/api again and you should have the app up and running.
You are also able to make changes to your files and see this reflecting with a nice hot-reload in your terminal logs.

Setup VSCode debugger

It is already good to have the app running and seeing the logs, but it is even better if we could use the vscode debugging functionality inside the container. So let's include that:

In the root of the project, create a folder called .vscode and add a file named launch.json inside of it with the following content:

// .vscode/launch/json
{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Delve into Docker",
      "type": "go",
      "request": "attach",
      "mode": "remote",
      "substitutePath": [
        {
          "from": "${workspaceFolder}/",
          "to": "/app/"
        }
      ],
      "port": 2345,
      "host": "127.0.0.1",
      "showLog": true,
      "apiVersion": 2,
      "trace": "verbose"
    }
  ]
}
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Now, as your app is already running you can simply press F5 and the VSCode debugger will be attached to your running container.

You can set a breakpoint inside of your endpoint handler, try to access the http://localhost:5000/api and see this working.

Create a Todo API

Now that we already have the initial setup ready and running, we can start implementing our API.
For this example, we are going to be creating a Todo API, containing the basic CRUD operations for a Todo entity.

Include Database connection

We are going to be using Postgres and a dependency called gorm for the connection.
So let's jump into the code!

First, let's create a .env file with the credentials for the database we are going to use:

DB_HOST=go-todo-db
DB_PORT=5432
DB_USER=postgres
DB_PASSWORD=root
DB_NAME=go-todo-db
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Now, let's include a new service into our docker-compose.yaml file right after our go-todo service with the following code:

  go-todo-db:
    container_name: go-todo-db
    image: postgres
    environment:
      - POSTGRES_USER=${DB_USER}
      - POSTGRES_PASSWORD=${DB_PASSWORD}
      - POSTGRES_DB=${DB_NAME}
    volumes:
      - postgres-db:/var/lib/postgresql/data
    ports:
      - "5432:5432"
    networks:
      - go-todo-network
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After this service, let's include a new volume named postgres-db:

volumes:
  postgres-db:
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Your complete docker-compose.yaml file should look like the following:

version: "3.7"

services:
  go-todo:
    container_name: go-todo
    image: thisk8brd/go-todo:dev
    build:
      context: .
      target: dev
    volumes:
      - .:/app
    ports:
      - "5000:5000"
      - "2345:2345"
    networks:
      - go-todo-network

  go-todo-db:
    container_name: go-todo-db
    image: postgres
    environment:
      - POSTGRES_USER=${DB_USER}
      - POSTGRES_PASSWORD=${DB_PASSWORD}
      - POSTGRES_DB=${DB_NAME}
    volumes:
      - postgres-db:/var/lib/postgresql/data
    ports:
      - "5432:5432"
    networks:
      - go-todo-network

volumes:
  postgres-db:

networks:
  go-todo-network:
    name: go-todo-network
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Create a folder named config and add a config.go file in it with the following content:

// config/config.go
package config

import (
    "fmt"
    "os"

    "github.com/joho/godotenv"
)

func Config(key string) string {
    err := godotenv.Load(".env")
    if err != nil {
        fmt.Print("Error loading .env file")
    }
    return os.Getenv(key)
}
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This code will be responsible for loading the .env content we had just created.

Create a module named database and create two files inside of it: connect.go and database.go.

Include the following content in the database.go file:

// database/database.go
package database

import "github.com/jinzhu/gorm"

// DB gorm connector
var DB *gorm.DB
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Next, include the following in the connect.go file:

// database/connect.go
package database

import (
    "fmt"
    "strconv"

    "github.com/pachecoio/go-todo/config"

    "github.com/jinzhu/gorm"
    _ "github.com/lib/pq"
)

func ConnectDB() {
    var err error
    p := config.Config("DB_PORT")
    port, err := strconv.ParseUint(p, 10, 32)

    configData := fmt.Sprintf(
        "host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
        config.Config("DB_HOST"),
        port,
        config.Config("DB_USER"),
        config.Config("DB_PASSWORD"),
        config.Config("DB_NAME"),
    )

    DB, err = gorm.Open(
        "postgres",
        configData,
    )

    if err != nil {
        fmt.Println(
            err.Error(),
        )
        panic("failed to connect database")
    }

    fmt.Println("Connection Opened to Database")
}
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Todo module implementation

Now let's create our todo module:

Create a new folder named todo and create a file named models.go:

// todo/models.go
package todo

import "github.com/jinzhu/gorm"

const (
    PENDING  = "pending"
    PROGRESS = "in_progress"
    DONE     = "done"
)

type Todo struct {
    gorm.Model
    Name        string `gorm:"Not Null" json:"name"`
    Description string `json:"description"`
    Status      string `gorm:"Not Null" json:"status"`
}
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Next, let's create our repository which will be responsible for handling all the database interactions for this Todo model just created.
Create a file named repositories.go inside of the todo module:

// todo/repositories.go
package todo

import (
    "errors"

    "github.com/jinzhu/gorm"
)

type TodoRepository struct {
    database *gorm.DB
}

func (repository *TodoRepository) FindAll() []Todo {
    var todos []Todo
    repository.database.Find(&todos)
    return todos
}

func (repository *TodoRepository) Find(id int) (Todo, error) {
    var todo Todo
    err := repository.database.Find(&todo, id).Error
    if todo.Name == "" {
        err = errors.New("Todo not found")
    }
    return todo, err
}

func (repository *TodoRepository) Create(todo Todo) (Todo, error) {
    err := repository.database.Create(&todo).Error
    if err != nil {
        return todo, err
    }

    return todo, nil
}

func (repository *TodoRepository) Save(user Todo) (Todo, error) {
    err := repository.database.Save(user).Error
    return user, err
}

func (repository *TodoRepository) Delete(id int) int64 {
    count := repository.database.Delete(&Todo{}, id).RowsAffected
    return count
}

func NewTodoRepository(database *gorm.DB) *TodoRepository {
    return &TodoRepository{
        database: database,
    }
}
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This repository file provides the base CRUD operations for this todo model and also a helper function to instantiate it. We will be covering how to use it next.

Now let's create our endpoint handlers.
Create a new file named handlers.go inside the todo module

// todo/handlers.go
package todo

import (
    "strconv"

    "github.com/gofiber/fiber/v2"
    "github.com/jinzhu/gorm"
)

type TodoHandler struct {
    repository *TodoRepository
}

func (handler *TodoHandler) GetAll(c *fiber.Ctx) error {
    var todos []Todo = handler.repository.FindAll()
    return c.JSON(todos)
}

func (handler *TodoHandler) Get(c *fiber.Ctx) error {
    id, err := strconv.Atoi(c.Params("id"))
    todo, err := handler.repository.Find(id)

    if err != nil {
        return c.Status(404).JSON(fiber.Map{
            "status": 404,
            "error":  err,
        })
    }

    return c.JSON(todo)
}

func (handler *TodoHandler) Create(c *fiber.Ctx) error {
    data := new(Todo)

    if err := c.BodyParser(data); err != nil {
        return c.Status(500).JSON(fiber.Map{"status": "error", "message": "Review your input", "error": err})
    }

    item, err := handler.repository.Create(*data)

    if err != nil {
        return c.Status(400).JSON(fiber.Map{
            "status":  400,
            "message": "Failed creating item",
            "error":   err,
        })
    }

    return c.JSON(item)
}

func (handler *TodoHandler) Update(c *fiber.Ctx) error {
    id, err := strconv.Atoi(c.Params("id"))

    if err != nil {
        return c.Status(400).JSON(fiber.Map{
            "status":  400,
            "message": "Item not found",
            "error":   err,
        })
    }

    todo, err := handler.repository.Find(id)

    if err != nil {
        return c.Status(404).JSON(fiber.Map{
            "message": "Item not found",
        })
    }

    todoData := new(Todo)

    if err := c.BodyParser(todoData); err != nil {
        return c.Status(400).JSON(fiber.Map{"status": "error", "message": "Review your input", "data": err})
    }

    todo.Name = todoData.Name
    todo.Description = todoData.Description
    todo.Status = todoData.Status

    item, err := handler.repository.Save(todo)

    if err != nil {
        return c.Status(400).JSON(fiber.Map{
            "message": "Error updating todo",
            "error":   err,
        })
    }

    return c.JSON(item)
}

func (handler *TodoHandler) Delete(c *fiber.Ctx) error {
    id, err := strconv.Atoi(c.Params("id"))
    if err != nil {
        return c.Status(400).JSON(fiber.Map{
            "status":  400,
            "message": "Failed deleting todo",
            "err":     err,
        })
    }
    RowsAffected := handler.repository.Delete(id)
    statusCode := 204
    if RowsAffected == 0 {
        statusCode = 400
    }
    return c.Status(statusCode).JSON(nil)
}

func NewTodoHandler(repository *TodoRepository) *TodoHandler {
    return &TodoHandler{
        repository: repository,
    }
}

func Register(router fiber.Router, database *gorm.DB) {
    database.AutoMigrate(&Todo{})
    todoRepository := NewTodoRepository(database)
    todoHandler := NewTodoHandler(todoRepository)

    movieRouter := router.Group("/todo")
    movieRouter.Get("/", todoHandler.GetAll)
    movieRouter.Get("/:id", todoHandler.Get)
    movieRouter.Put("/:id", todoHandler.Update)
    movieRouter.Post("/", todoHandler.Create)
    movieRouter.Delete("/:id", todoHandler.Delete)
}
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This file is responsible for handling the HTTP requests.
We provide here a set of functions to get all Todos, get single, update, create and delete a Todo.
We also provide a helper to register this handler and it also covers auto migrating the databases so we don't need to create the tables ourselves.

Wrapping up

Now in our main.go file, let's connect to the database and register our todo handlers:

initialize the DB connection right after our CORS definition:

// main.go
// ...
    app.Use(cors.New())
    database.ConnectDB()
    defer database.DB.Close()
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Remove the test endpoint we had in place and register the new todo handlers:

    todo.Register(api, database.DB)
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The complete main.go file should look like the following:

// main.go
package main

import (
    "log"

    "github.com/gofiber/fiber/v2"
    "github.com/gofiber/fiber/v2/middleware/cors"
    "github.com/pachecoio/go-todo/database"
    "github.com/pachecoio/go-todo/todo"
)

func main() {
    app := fiber.New()
    app.Use(cors.New())
    database.ConnectDB()
    defer database.DB.Close()

    api := app.Group("/api")
    todo.Register(api, database.DB)

    log.Fatal(app.Listen(":5000"))
}
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At this point, we can run the app again and test the endpoints. Run the following command to rebuild and run the app with docker:

docker compose up --build
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We pass the --build flag to make sure we rebuild and install the dependencies we have just included, but you don't need to include this flag every time you run it. Include it only if you change any dependency or the Dockerfile itself.

Press F5 to attach the VSCode debugger and test the app!

You can use this swagger file to check and test the endpoints we just created for this app.
To test the endpoints, I recommend you to download a HTTP client like Insomnia. Follow below the steps to test it:

Testing with Insomnia

Create a new design document

Go to the Design tab, copy the swagger content and paste in the editor

Go to the debug section and check the endpoints generated

Test the Create todo endpoint

Test the Todo collection endpoint

Test get single todo endpoint

Test update todo endpoint

Test delete todo endpoint

I encourage you to add extra functionalities like filtering the Todo by status and keywords, validating allowed status and so on. Share your results in the comments!

I hope this tutorial was useful and I would be more than happy to receive questions, doubts or suggestions about it!
The source code can be found here.

Have fun, stay safe and see you in the next one!

Top comments (16)

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mathmul profile image
Matej •

Awesome tutorial.

I came to it because I got stuck in my own project. In my project I wrote a different swagger.yml file and then generated with swagger generate... command. This gave gen folder and 2 folders inside, namely models and restapi.

Now I don't know how use the files generated, so I found this great article. I didn't know of Fiber, nor GORM, and they're awesome, thank you! I did your entire tutorial directly inside my project and it works great.

I was hoping though, that once I have that up and running, I will be able to replace "Todo" references with my "Group" and "User" stuff, but with those handlers.go, repositories.go and models.go it's a completely different structure.

Any idea how to go forward, given this poor description?

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pacheco profile image
Thiago Pacheco • • Edited

Hi Matej, thanks a lot for your feedback! I am glad you liked it.
Given your explanation above, I would actually suggest you to start by mapping your concepts into models like the todo model example. From there you create the repositories and handlers accordingly.
It is a bit hard to help without knowing much about your context, but I would gladly provide more help if you'd share more details about it. You can DM me on twitter if you want: @dev_pacheco.

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mathmul profile image
Matej •

I really would take you up on the offer, but @dev_pacheco can't be messaged.

I did make a copy of "todo" folder (module) and renamed it to "group". Also renamed everything in the files from todo to group, Todo to Group, and TodoSomething to GroupSomething. This wouldn't immediately be OK, since Group was wrong, given my import "github.com/me/project/gen/models", so I had to replace Todo with models.Group, and most errors were gone. It also automatically put an asterisk (*) before group.Name in func (repository) Find (id) in the if condition. Then I suppose I can just delete the "models.go" file in "groups" module. So now I think all it's left is to fix Register func to have the same basePath as in REST API, ie.

func Register(router fiber.Router, database *gorm.DB) {
    database.AutoMigrate(&models.Group{})
    groupRepository := NewGroupRepository(database)
    groupHandler := NewGroupHandler(groupRepository)

    groupsRouter := router.Group("/groups")
    groupsRouter.Get("/", groupHandler.GetAll)
    groupsRouter.Post("/", groupHandler.Create)
    groupsRouter.Get("/:id", groupHandler.Get)
    groupsRouter.Put("/:id", groupHandler.Update)
    groupsRouter.Delete("/:id", groupHandler.Delete)
}
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And yes that actually worked! Thank you... I am curious though if I really need to set Router stuff here in the register manually like this, or can I get those methods set somehow from the REST API files generated from Swagger?

Thread Thread
 
mathmul profile image
Matej •

Also how does one write tests to make sure the database is connected, or a new Todo can be added?

Thread Thread
 
pacheco profile image
Thiago Pacheco •

Hey Matej, I am glad you could figure it out!
About the router, you can definitely setup differently, the Register func is just a suggestion. The idea about having this Register func is to have an unique way to initialize each of your modules.

Thread Thread
 
pacheco profile image
Thiago Pacheco •

Definitely, it is a good practice to write tests.
I didn't include here because the article would get too long, but I could definitely create a part 2 of this article talking about tests, if that would be interesting.

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masdjab profile image
Heryudi Praja •

I like your tutorial. It's nice, clear, easy to understand. Thanks.

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dryluigi profile image
Mario Prasetya M. • • Edited

hey i really love your article. how you explain is kinda concise and clear :). but the dockerfile section attract my attention. if you wouldn't mind, may I ask you a question? how the container is supposed to run when you only define ENTRYPOINT without CMD or other command related to running the built go application?

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pacheco profile image
Thiago Pacheco •

Hi @dryluigi, thanks for the feedback!
The command to run is defined in the ENTRYPOINT line.
In the dockerfile we can specify how to run the app through either of these 2 options: CMD or ENTRYPOINT.
The ENTRYPOINT one is prefered if you have an specific built entrypoint to run the app, which in our case we have the air to run on dev mode and the todo built file if we want to run a production version. This option is good for apps that generate a build file, like Golang or Java apps for example.
The CMD is used when you want to define a default command that can be overridden or extended by whoever wants to use this file. In Node.js applications for example you might have a: CMD ['npm', 'start'].

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ujjavala profile image
ujjavala •

this is really good. i haven't tried fiber yet. will definitely do now :)

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pacheco profile image
Thiago Pacheco •

Thank you @ujjavala ! Fiber is fun, I hope you also like it :)

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geekmaros_23 profile image
Abdulrasaq Mustapha •

I recently started learning Go and even with my basic knowledge I was till able to follow the articel, well structured

Thanks @thiago

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pacheco profile image
Thiago Pacheco •

I am so happy to know that, thanks for the feedback @geekmaros_23 !

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elserhumano profile image
Fernando •

Nice article! I enjoyed a lot! Thx! :)

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Thiago Pacheco •

Hey Fernando, thanks for your feedback!
I am glad you liked it :D

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Sloan, the sloth mascot
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