feat(): adds support for CRUD over libraries

books.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/pborman/uuid"
+)
+
+// Book is the representation of a book
+type Book struct {
+	ID            uuid.UUID `json:"id" gorm:"primary_key"`
+	Name          string    `json:"name"`
+	Author        string    `json:"author"`
+	PublishedDate time.Time `json:"publishedDate"`
+}
+
+func getBooks(w http.ResponseWriter, r *http.Request) {
+}
+
+func createBook(w http.ResponseWriter, r *http.Request) {
+}
+
+func updateBook(w http.ResponseWriter, r *http.Request) {
+}
+
+func getOneBook(w http.ResponseWriter, r *http.Request) {
+}
+
+func deleteOneBook(w http.ResponseWriter, r *http.Request) {
+}

libraries.go

@@ -0,0 +1,110 @@
+package main
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+
+	"github.com/gorilla/mux"
+	"github.com/pborman/uuid"
+)
+
+// Library is the representation of a library
+type Library struct {
+	ID      string `json:"id" sql:"type:varchar(36);primary key" gorm:"primary_key"`
+	Name    string `json:"name"`
+	Address string `json:"address"`
+	Phone   string `json:"phone"`
+}
+
+func getLibraries(w http.ResponseWriter, r *http.Request) {
+	var libraries []Library
+	db.Find(&libraries)
+	writeJSON(w, libraries)
+}
+
+func createLibrary(w http.ResponseWriter, r *http.Request) {
+	newLibrary, err := libraryFromJSON(r.Body)
+	if err != nil {
+		http.Error(w, "Invalid JSON provided", http.StatusBadRequest)
+		return
+	}
+	validationErrs := validateLibrary(*newLibrary)
+	if len(validationErrs) > 0 {
+		w.WriteHeader(http.StatusBadRequest)
+		writeJSON(w, validationErrs)
+		return
+	}
+	newLibrary.ID = uuid.NewUUID().String()
+	db.Create(newLibrary)
+	w.Header().Set("Library-Id", newLibrary.ID)
+	w.WriteHeader(201)
+}
+
+func updateLibrary(w http.ResponseWriter, r *http.Request) {
+	var library Library
+	requestVars := mux.Vars(r)
+	db.Where("id = ?", requestVars["libraryId"]).Find(&library)
+	if library.ID == "" {
+		http.Error(w, "", http.StatusNotFound)
+		return
+	}
+
+	update, err := libraryFromJSON(r.Body)
+	if err != nil {
+		http.Error(w, "Invalid JSON provided", http.StatusBadRequest)
+		return
+	}
+	library.Name = update.Name
+	library.Address = update.Address
+	library.Phone = update.Phone
+
+	validationErrs := validateLibrary(library)
+	if len(validationErrs) > 0 {
+		w.WriteHeader(http.StatusBadRequest)
+		writeJSON(w, validationErrs)
+		return
+	}
+
+	writeJSON(w, library)
+}
+
+func getOneLibrary(w http.ResponseWriter, r *http.Request) {
+	var library Library
+	requestVars := mux.Vars(r)
+	db.Where("id = ?", requestVars["libraryId"]).Find(&library)
+	if library.ID == "" {
+		http.Error(w, "", http.StatusNotFound)
+		return
+	}
+	writeJSON(w, library)
+}
+
+func deleteLibrary(w http.ResponseWriter, r *http.Request) {
+	requestVars := mux.Vars(r)
+	db.Where("id = ?", requestVars["libraryId"]).Delete(&Library{})
+	w.WriteHeader(http.StatusNoContent)
+}
+
+func libraryFromJSON(data io.ReadCloser) (*Library, error) {
+	var library = new(Library)
+	decoder := json.NewDecoder(data)
+	err := decoder.Decode(library)
+	if err != nil {
+		return nil, err
+	}
+	return library, nil
+}
+
+func validateLibrary(library Library) (errs []string) {
+	if library.Name == "" {
+		errs = append(errs, "The name is required")
+	}
+	if library.Address == "" {
+		errs = append(errs, "The address is required")
+	}
+	if library.Phone == "" {
+		errs = append(errs, "The phone is required")
+	}
+	return
+}

main.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"sync"
+
+	"github.com/gorilla/mux"
+	"github.com/jinzhu/gorm"
+	_ "github.com/jinzhu/gorm/dialects/mysql"
+)
+
+var db *gorm.DB
+
+func main() {
+	initDatabase()
+	defer db.Close()
+
+	router := mux.NewRouter()
+	apiRouter := router.PathPrefix("/api").Subrouter()
+	apiRouter.HandleFunc("/libraries", getLibraries).Methods("GET")
+	apiRouter.HandleFunc("/libraries", createLibrary).Methods("POST")
+	apiRouter.HandleFunc("/libraries/{libraryId}", updateLibrary).Methods("PUT")
+	apiRouter.HandleFunc("/libraries/{libraryId}", getOneLibrary).Methods("GET")
+	apiRouter.HandleFunc("/libraries/{libraryId}", deleteLibrary).Methods("DELETE")
+	apiRouter.HandleFunc("/libraries/{libraryId}/books", getBooks).Methods("GET")
+	apiRouter.HandleFunc("/libraries/{libraryId}/books", createBook).Methods("GET")
+	apiRouter.HandleFunc("/libraries/{libraryId}/books/{bookId}", updateBook).Methods("PUT")
+	apiRouter.HandleFunc("/libraries/{libraryId}/books/{bookId}", getOneBook).Methods("GET")
+	apiRouter.HandleFunc("/libraries/{libraryId}/books/{bookId}", deleteOneBook).Methods("DELETE")
+
+	http.Handle("/", router)
+	fmt.Println("Application started on port 8080")
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}
+
+var initContext sync.Once
+
+func initDatabase() {
+	initContext.Do(func() {
+		var err error
+		db, err = gorm.Open("mysql", "root:root@/books_api?charset=utf8&parseTime=True&loc=Local")
+		if err != nil {
+			log.Fatalf("Fail to connect to db: %v", err)
+		}
+	})
+}
+
+func writeJSON(w http.ResponseWriter, data interface{}) {
+	bytes, err := json.Marshal(data)
+	if err != nil {
+		log.Printf("error while encoding json: %v", err)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(bytes)
+}