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main.go
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main.go
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package main
import (
"encoding/json"
"log"
"net/http"
"math/rand"
"strconv"
"github.com/gorilla/mux"
)
//Book Struct (model)
type Book struct {
ID string `json:"id"`
Isbn string `json:"isbn"`
Title string `json:"title"`
Author *Author `json:"author"`
}
// Init books var as slice Book struct
var books []Book
// Get all Books
func getBooks(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(books)
}
// Get a Book
func getBook(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
params := mux.Vars(r) // Get Params
//Loop finding the requested book
for _, item := range books {
if item.ID == params["id"] {
json.NewEncoder(w).Encode(item)
return
}
}
json.NewEncoder(w).Encode(&Book{})
}
// Create a Book
func createBook(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
var book Book
_ = json.NewDecoder(r.Body).Decode(&book)
book.ID =strconv.Itoa(rand.Intn(1000000)) // Mock ID, use UUID instead
books = append(books, book)
json.NewEncoder(w).Encode(book)
}
// Update a Book
func updateBook(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
params := mux.Vars(r) // Get Params
for index, item := range books {
if item.ID == params["id"] {
books = append(books[:index], books[index+1:]...)
var book Book
_ = json.NewDecoder(r.Body).Decode(&book)
book.ID = params["id"] // Mock ID, use UUID instead
books = append(books, book)
json.NewEncoder(w).Encode(book)
return
}
}
json.NewEncoder(w).Encode(&Book{})
}
// Delete a Book
func deleteBook(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r) // Get Params
for index, item := range books {
if item.ID == params["id"] {
books = append(books[:index], books[index+1:]...)
break
}
}
}
// Author Struct
type Author struct {
Firstname string `json:firstname`
Lastname string `json:lastname`
}
func main() {
// Init Router
r := mux.NewRouter()
// Mocking Data - @todo - implement DB
books = append(books, Book{ID: "1", Isbn: "448743", Title: "Book One", Author: &Author{Firstname: "John", Lastname: "Piper"}})
books = append(books, Book{ID: "2", Isbn: "448181", Title: "Book Two", Author: &Author{Firstname: "Tom", Lastname: "Merlin"}})
books = append(books, Book{ID: "3", Isbn: "442387", Title: "Book Three", Author: &Author{Firstname: "Clark", Lastname: "Kent"}})
books = append(books, Book{ID: "4", Isbn: "419838", Title: "Book Four", Author: &Author{Firstname: "Ted", Lastname: "Mosby"}})
// Route Handlers / Endpoints
r.HandleFunc("/api/books", getBooks).Methods("GET")
r.HandleFunc("/api/books", createBook).Methods("POST")
r.HandleFunc("/api/books/{id}", getBook).Methods("GET")
r.HandleFunc("/api/books/{id}", updateBook).Methods("PUT")
r.HandleFunc("/api/books/{id}", deleteBook).Methods("DELETE")
log.Fatal(http.ListenAndServe(":8000", r))
}