go-dynamodb-tutorial

How to run

Clone the repository

git clone https://github.com/go-tutorials/go-dynamodb-tutorial.git
cd go-dynamodb-tutorial

To run the application

go run main.go

API Design

Common HTTP methods

• GET: retrieve a representation of the resource
• POST: create a new resource
• PUT: update the resource
• PATCH: perform a partial update of a resource
• DELETE: delete a resource

API design for health check

To check if the service is available.

Request: GET /health

Response:

{
    "status": "UP",
    "details": {
        "dynamodb": {
            "status": "UP"
        }
    }
}

API design for users

Resource: users

Get all users

Request: GET /users

Response:

[
    {
        "id": "spiderman",
        "username": "peter.parker",
        "email": "peter.parker@gmail.com",
        "phone": "0987654321",
        "dateOfBirth": "1962-08-25T16:59:59.999Z"
    },
    {
        "id": "wolverine",
        "username": "james.howlett",
        "email": "james.howlett@gmail.com",
        "phone": "0987654321",
        "dateOfBirth": "1974-11-16T16:59:59.999Z"
    }
]

Get one user by id

Request: GET /users/:id

GET /users/wolverine

Response:

{
    "id": "wolverine",
    "username": "james.howlett",
    "email": "james.howlett@gmail.com",
    "phone": "0987654321",
    "dateOfBirth": "1974-11-16T16:59:59.999Z"
}

Create a new user

Request: POST /users

{
    "id": "wolverine",
    "username": "james.howlett",
    "email": "james.howlett@gmail.com",
    "phone": "0987654321",
    "dateOfBirth": "1974-11-16T16:59:59.999Z"
}

Response: 1: success, 0: duplicate key, -1: error

1

Update one user by id

Request: PUT /users/:id

PUT /users/wolverine

{
    "username": "james.howlett",
    "email": "james.howlett@gmail.com",
    "phone": "0987654321",
    "dateOfBirth": "1974-11-16T16:59:59.999Z"
}

Response: 1: success, 0: not found, -1: error

1

Delete a new user by id

Request: DELETE /users/:id

DELETE /users/wolverine

Response: 1: success, 0: not found, -1: error

1

Common libraries

• core-go/health: include HealthHandler, HealthChecker, SqlHealthChecker
• core-go/config: to load the config file, and merge with other environments (SIT, UAT, ENV)
• core-go/log: log and log middleware
• core-go/dynamodb: to load config, some utils for dynamodb.

core-go/health

To check if the service is available, refer to core-go/health

Request: GET /health

Response:

{
    "status": "UP",
    "details": {
        "dynamodb": {
            "status": "UP"
        }
    }
}

To create health checker, and health handler

	
    db, err := d.Connect(conf)
	if err != nil {
		return nil, err
	}

	dynamodbChecker := services.NewDynamodbHealthChecker(db)
	checkers := []health.HealthChecker{dynamodbChecker}
	healthHandler := health.NewHealthHandler(checkers)

To handler routing

	r := mux.NewRouter()
	r.HandleFunc("/health", healthHandler.Check).Methods("GET")

core-go/config

To load the config from "config.yml", in "configs" folder

package main

import (
	"github.com/core-go/config"
	"github.com/core-go/dynamodb"
)

type Root struct {
	DB dynamodb.Config `mapstructure:"db"`
}

func main() {
	var conf Root
	err := config.Load(&conf, "configs/config")
	if err != nil {
		panic(err)
	}
}

core-go/log & core-go/middleware

import (
	"github.com/core-go/config"
	"github.com/core-go/log"
	mid "github.com/core-go/log/middleware"
	"github.com/gorilla/mux"
)

func main() {
	var conf app.Root
	config.Load(&conf, "configs/config")

	r := mux.NewRouter()

	log.Initialize(conf.Log)
	r.Use(mid.BuildContext)
	logger := mid.NewStructuredLogger()
	r.Use(mid.Logger(conf.MiddleWare, log.InfoFields, logger))
	r.Use(mid.Recover(log.ErrorMsg))
}

To configure to ignore the health check, use "skips":

middleware:
  skips: /health