9.6. HTTP Server

Part 1: Ping and Logger

Tasks

1. Run a server and implement a handler which returns pong on the endpoint /ping.
2. Create a middleware to log every request. Log the path, method, duration and the IP of the client of the request.

Your log should look similar to this:

2022/04/11 10:03:08 remote=192.168.1.143 path=/foo method=GET duration=13.765874ms

Tips

See 5.4. HTTP Server.

start := time.Now()

// perform action

duration := time.Now().Sub(start)

Part 2: User API

Tasks

Create a JSON REST API where you can create, list and delete users.

The API should provide the following endpoints:

• POST /user: create a user
• GET /user: returns all users
• GET /user/<ID>: returns a single user by ID
• DELETE /user/<ID>: delete user by ID

The user should look like this:

{
    "name": "john",
    "full_name": "John Doe",
    "followers": 13
}

You can decide how you would like to store the users. One option would be to store them only in-memory for example in a map map[int]User. Another option would be to store serialize the users into a file (e.g. with JSON).

Tips

See 5.4. HTTP Server.

Part 3: User API Client

Tasks

Create CLI tool to list, create and delete users:

# create user
./usercli create bob
./usercli create bob "Bob Meier"
./usercli create bob "Bob Meier" 34

# list all users
./usercli get 

# show specific user
./usercli get bob

# delete user
./usercli delete bob

Tips

Take a look at the github-info-client example to get an idea on how to implement this.

Solutions

• Part 1: Ping and Log Middleware: https://github.com/acend/go-basics-training-examples/tree/master/http-server
• Part 2 + 3: User API: https://github.com/acend/go-basics-training-examples/tree/master/user-api