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Accounts-Service

Made a account microservice that can create user from a POST request and store it in a Postgres DB; and can get user information using UUID with a GET request. Used bcrypt to hash the password in the database.

NOTE - This isn't a Sign-Up and Sign-In service, it is just an account service although it can be turned into one with a few lines of code :)

Running

  1. Download the project in your GOPATH.
  2. Create a database with name users or whatever name you like.
  3. Go to accounts/pkg/db/db.go file and fill your database connection information to connect to the database.
  4. cd inside the folder and run docker-compose up using the docker-compose.yml file or using go run accounts/cmd/main.go.
  5. Start Postman for doing request and response as shown below or use curl commands.

Request And Response

  1. POST request done on http://localhost:8081/create-user
{
	"User":{
		"email":"email5", 
		"password":"password5"
	}
}

POST response

{
    "Id": "65c006f3-1c5c-47f1-bd72-48349ddcdb6a",
    "Error": null
}
  1. GET request done on http://localhost:8081/get-user
{
	"ID" : "65c006f3-1c5c-47f1-bd72-48349ddcdb6a"
}

GET response

{
    "Email": "email5",
    "Error": null
}

Database

Useful commands to use -

  1. Switch over to the postgres account on your server by typing sudo -i -u postgres
  2. You can now access a Postgres prompt immediately by typing psql
  3. Use this to see all the tables \dt
  4. Use this to see info of a particular table select * from "users";
                  id                  |      email      |                           password                           
--------------------------------------+-----------------+--------------------------------------------------------------
 ce843823-e91f-4435-a4df-1b779ab2b587 | bcryptUser      | $2a$10$mtGwIQz3jhwINxH.0832hu5YQql/.kO.oJl3qJvo0EtwPqLZ.L0KO
 65c006f3-1c5c-47f1-bd72-48349ddcdb6a | email5     	| $2a$10$ah/zGl1JUvHZ9eUAAG4Nx.NWIdjI1yFVxQGAJ8Zpz4QKyL8U3ATH2
(2 rows)
  1. To quit use \q
  2. To exit use exit

Architechture

accounts/  
|---cmd/  
|------service/  
|----------server.go          Wire the service.  
|----------server_gen.go      Also wire the service.  
|------main.go                Runs the service  
|---pkg/  
|------endpoints/  
|----------endpoint.go        The endpoint logic along with structures for request and reponse.  
|----------endpoint_gen.go    This will wire the endpoints.  
|----------middleware.go      Endpoint middleware  
|------http/  
|----------handler.go         Transport logic encode/decode data and  
|                             gorilla mux request reponse routing of the service.  
|----------handler_gen.go     This will wire the transport.  
|------io/  
|----------io.go              The input output structs.  
|------db/  
|----------db.go              Gets connection to PostgreSQl database.  
|------service/  
|----------middleware.go      The service middleware.  
|----------service.go         Business logic.

Advantages of UUID

  1. Can generate them offline.
  2. Makes replication trivial (as opposed to int's, which makes it REALLY hard)
  3. ORM's usually like them
  4. Unique across applications. So We can use the PK's from our CMS (guid) in our app (also guid) and know we are NEVER going to get a clash.