http

package main

import (
    "encoding/json"
    "fmt"
    "net/http"
)

type Note struct {
    Id         string `json:"id"`
    Title      string `json:"title"`
    Text       string `json:"text"`
    DateCreate uint   `json:"date_create"`
    DateUpdate uint   `json:"date_update"`
}

var preparedNotes = []Note{
    Note{"10dcdccb-8876-4245-ac53-92900c6509bd", "Первая заметка", "Вторая заметка", 1513759529, 1517259529},
    Note{"10dcdccb-8876-4245-ac53-92900c6509bd", "Первая заметка", "Вторая заметка", 1513759529, 1517259529},
}

func addNote(w http.ResponseWriter, r *http.Request) {
    var note Note
    err := json.NewDecoder(r.Body).Decode(&note)
    if err != nil || note.Text == "" || note.Title == "" {
        w.WriteHeader(400)
        return
    }

    //add

    w.WriteHeader(201)
}

func updateNote(w http.ResponseWriter, r *http.Request) {
    var note Note
    err := json.NewDecoder(r.Body).Decode(&note)
    if err != nil || note.Id == "" || note.Text == "" || note.Title == "" {
        w.WriteHeader(400)
        return
    }

    //update

    w.WriteHeader(201)
}

func deleteNote(w http.ResponseWriter, r *http.Request) {
    var note Note
    err := json.NewDecoder(r.Body).Decode(&note)
    if err != nil || note.Id == "" {
        w.WriteHeader(400)
        return
    }

    //delete

    w.WriteHeader(204)
}

func getNotes(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-type", "application/json; charset=utf-8")
    if err := json.NewEncoder(w).Encode(preparedNotes); err != nil {
        w.WriteHeader(500)
    }
}

func updateRecord(w http.ResponseWriter, r *http.Request) {

}

func main() {

    //http.HandleFunc("")
    http.MethodDelete("/", deleteNote)
    http.HandleFunc("/", getNotes)
    http.HandleFunc("/", addNote)
    fmt.Println("Starting server at 8080")
    http.ListenAndServe(":8080", nil)
}