first commit

api/api.go

@@ -0,0 +1,18 @@
+package api
+
+import (
+	"net/http"
+
+	"dacremont.xyz/learnrest/api/messages"
+)
+
+type Api struct {}
+
+func NewApi () *http.ServeMux {
+	mux := http.NewServeMux()
+
+	mux.Handle("/messages", messages.NewMessagesAPI())
+	mux.HandleFunc("GET /hello", func(w http.ResponseWriter, r *http.Request) {w.Write([]byte("World!"))})
+
+	return mux
+}

api/messages/handler.go

@@ -0,0 +1,44 @@
+package messages
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+func getMessages(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	err := json.NewEncoder(w).Encode(getAllMessages())
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func postMessages(w http.ResponseWriter, r *http.Request) {
+	var payload Message
+	err := json.NewDecoder(r.Body).Decode(&payload)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	msg := Message{
+		Author_id: payload.Author_id,
+		Text: payload.Text,
+	}
+
+	err = insertMessage(msg)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+	}
+}
+
+func NewMessagesAPI() *http.ServeMux {
+	initMessages()
+	mux := http.NewServeMux()
+
+	mux.HandleFunc("GET /", getMessages)
+	mux.HandleFunc("POST /", postMessages)
+
+	return mux
+}

api/messages/model.go

@@ -0,0 +1,45 @@
+package messages
+
+import "errors"
+
+type Message struct {
+	MessageId uint64 `json:"message_id"`
+	Author_id uint64 `json:"author_id"`
+	Text string `json:"text"`
+}
+
+var messages []Message
+
+func initMessages() {
+	messages = make([]Message, 0)
+}
+
+func insertMessage(msg Message) error {
+	if msg.Author_id == 0 {
+		return errors.New("An author_id must be specified")
+	}
+
+	if msg.Text == "" {
+		return errors.New("The field text must not be empty")
+	}
+
+	messages = append(messages, Message{
+		MessageId: uint64(len(messages)),
+		Text: msg.Text,
+		Author_id: msg.Author_id,
+	})
+
+	return nil
+}
+
+func getAllMessages() []Message {
+	return messages
+}
+
+func getMessageById(id uint64) (Message, error) {
+	if int(id) >= len(messages) {
+		return Message{}, errors.New("Message doesn't exists")
+	}
+
+	return messages[id], nil
+}

api/users/handler.go

@@ -0,0 +1 @@
+package users

api/users/model.go

@@ -0,0 +1,7 @@
+package users
+
+type User struct {
+	Id uint64 `json:"id"`
+	Name string `json:"name"`
+}
+

go.mod

@@ -0,0 +1,3 @@
+module dacremont.xyz/learnrest
+
+go 1.24.3

main.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"dacremont.xyz/learnrest/api"
+)
+
+func main() {
+	server := http.Server{
+		Addr: ":8080",
+		Handler: api.NewApi(),
+	}
+
+	err := server.ListenAndServe()
+	if err != nil {
+		log.Fatal(err)
+	}
+}